Synthesis and Characterization of Tetraphenyltin

Synthesis and Characterization of Tetraphenyltin ABSTRACTS Tetraphenyltin in high yield has been prepared by the reaction of chlorobenzene, chlorotin (IV) and sodium metal in dry toluene characterized by Infra-red spectroscopy. Introduction Organic compounds that contains metal-carbon bond are called organometallic compounds. Organometallic compounds have been studied for nearly 200 years. Unique properties of these compounds have been used in many areas of life. The reactivity of organometallic compounds depends on the reduction potential of metal. For preparation and use, it is markedly observed that most reactivity requires low to moderate temperature and inert conditions like atmosphere and solvent. Generally the reactivity of these compounds seems like the ionic character of the carbon-metal bond, which may be estimated from the proton and carbon chemical shifts of methyl derivatives. % Ionic character of H3C–Metal as (CH3)2Hg 3)2Cd 3)2Zn 3)2Mg 3L [1]. The first reported organometallic compounds were prepared by the reductive substitution of alkyl halides. Alkali metals have strong or moderate negative reduction potentials, with lithium and magnesium being the most reactive. Halide reactivity increases in the order: Cl _R) tends to predominate. This can also be a problem when allyl or benzyl halides are converted to Grignard or lithium reagent [2]. Organometallic compounds of group (IV) elements There is an exceedingly extensive chemistry of the group four elements bound to carbon and some of the compounds, notably silicon-oxygen polymers and alkyl tin and lead compounds are of commercial importance. Essentially all the compounds are of the type M(IV) type. In the divalent state the only well established compounds are cyclopentadienyl tin alkyls or aryls of formula R2Sn are either transitory or non-existent, and the stable substances of this stoichiometry are linear or cyclic polymers of tetravalent tin. For all the group four elements the compounds can generally be designated R4-nMXn where R is the alkyl or aryl and X can vary widely being H, Cl, O, COR, OR, NR2SR etc. For a given class of compounds those with C-Si and C-Ge bonds have higher thermal stability and lower reactivity than those with bonds to Sn and Pb [3]. Organometallic compounds of Tin There are four series of organotin compounds depending on the number of carbon-tin bonds. These series are designated as mono-, di-, tri-, and tetraorganotin compounds with the general formula: RnSn X4-n Where R = an alkyl or aryl group Sn = the central tin atom in the oxidation state +4 X = a singly charged anion or an anionic organic group [4]. Complexes of transition metals The ability of transition metals to form organo derivatives only begins to be appreciated properly during the nineteen fifties. Nonetheless, the organometallic compounds of transition metals now constitute an enormous, diversified field of chemistry, which is still expanding rapidly. It begins breadth by merging into the field of metal carbonyls and related compounds. They also differ in structure from that of non-transition organo-metal derivatives. The transition metals form compounds in which there is metal to carbon sigma bond although pi bond in some cases may also be formed. More important, the unique characteristic of d orbital allow certain type of unsaturated hydrocarbons and some of their derivatives to be bound to metals in a non-classical manner to give molecules or ions with structures that have no counterpart elsewhere in chemistry. Not only is a wide range of organo compounds of different types are isolable, but also labile species play an important role in olefins, acetylene and their derivatives catalyzed by metal complexes [5]. Applications of Organotin compounds Depending on the organic groups, they can be powerful bactericides and fungicides [4]. Tributyltins are used as industrial biocides, eg. as antifungal agents in textiles and paper, wood pulp and paper mill systems, breweries, and industrial cooling systems. Tributyltins are also used in marine anti-fouling paint [1]. Triphenyltins are used as active components of anti fungal paints and agricultural fungicides [5]. Organotin compounds are widely studied class of meta-based antitumor drugs [2]. Organotin compounds are used in treatment of hyperbilirubinaemia [2]. Organotin compounds are used in chemicals used for wood preservation [1]. Addition of Organotin compounds to PVC increases its stability [1]. Organo metallic transition complexes also have role in molecular rearrangement processes [2]. Hypercoordinated Stannanes Tin compounds can also be coordinated to five atoms instead of the regular four unlike their carbon analogues. The stability of these hypercoordinated compounds is managed by electronegative substituent. In 2007 a stable organotin (all carbon pentaorganostannane) was reported at room-temperature (in argon) [4] in the form of lithium salt with the following structure. The geometry of the molecule is distorted trigonal bipyramidal. The carbon to tin bond lengths are 2.26Ã… apical, 2.17Ã… equatorial. These are larger than regular C–Sn bonds (2.14Ã…) which shows its hypervalent nature. Biological Aspects The chemistry of the organotin(IV) derivatives is being subject of study with growing interest, not only because of the environmental consequences of the widespread use of these compounds, but also as due to the increasingly importance of their medical assays for bactericide and antitumor purposes. In this respect, various triorganotins have been reported recently to be effective against mosquito larvae and adult mosquitoes responsible for malaria and yellow fever, and also some phenyltin derivatives display cardiovascular activity. In general, the structure-activity relationship in this kind of compounds is still subject of controversy, but it seems been established that, for instance, in the case of triorganotin carboxylates, those containing trans-O2SnC3 moieties exhibit a greater biocidal activity than those containing cis-O2SnC3. Organotin compounds have been implicated as reproductive toxicants and endocrine disruptors primarily through studies in aquatic organisms, with little information available in mammals. Among the organotins, aryltins have been less studied than alkyltins. Extensive data is available on mammalian developmental and reproductive toxicity of one aryltin compound, triphenyltin (TPT), from toxicity studies conducted in connection with the registration of triphenyltin hydroxide (TPTH) as a pesticide and supporting publications from the open literature. Indications of adverse functional and morphological effects on the reproductive tract of rats were reported in a dose range of 1.4-20 mg/kg/d. Gonadal histopathology (both ovaries and testes) and infertility were affected at the higher doses, while reproductive-tract cancer, smaller litter sizes, and reproductive organ weights were affected at the lower end of the dose range. In vitro studies indicate the TPT can directly activate androgen re ceptor-mediated transcription and inhibit enzymes that are involved in steroid hormone metabolism. These data suggest that the aryltin TPT can be active as a reproductive toxicant in mammals and may be a human endocrine disruptor. Organotins are one of the classes of compounds implicated as â€Å"endocrine disruptors† (Colborn Clement, 1992) primarily on the basis of the finding of imposex in aquatic gastropods (Smith, 1981; Horiguchi et al., 1994). In these organisms, genetic females and parts of the male reproductive system, including the penis and vas deferens, superimposed on a normal female genital system. Implications for mammalian reproduction are less explored. There are no available epidemiological studies of the reproductive toxicity of organotins in humans or mammalian wildlife populations, so that mammalian reproductive toxicity information is limited to laboratory animals. Among the organotins, a particularly large database on reproductive toxicity in laboratory animals is available through studies conducted for registration of triphenyltin hydroxide as a pesticide. Triphenyltin (TPT) came into use as a fungicide and matricide in the 1950s (HSDB, 1998). Currently, about 10 products containing TPT are registered for use as pesticides by the U.S. Environmental Protection Agency (U.S. EPA). Registration for TPT hydroxide was cancelled in California in 1983. TPT acetate and hydroxide were banned from use in the European Union (EU) in 2002 (Lo et al., 2003). This review presents and integrates information on reproductive toxicity from the triphenyltin hydroxide (TPTH) registration database made available through the Freedom of Information Act (FOIA), and includes papers on mammalian reproductive toxicity of other TPT salts. In this review, information from the pesticide registration data is presented in some detail since it is not available. Estimates of exposure for total tin indicate that the main route in the general population is from food, about 4 mg/d. A national survey in the United States in 1982 reported 8.7-15 à ¯Ã‚ Ã‚ ­g tin/g in human adipose tissue (ATSDR, 1992). However, these estimates are based on outdated information, and much of the tin came from canned foods (inorganic tin) (ATSDR, 1992). The most recent information for TPT is from Japan (Tsuda et al., 1995). Duplicate portion studies indicated an intake of 0.7 à ¯Ã‚ Ã‚ ­g TPT/d in 1991 and 1992, and market basket surveys indicated intakes of 5.4 and 1.3 à ¯Ã‚ Ã‚ ­g TPT/d in 1991 and 1992, respectively. Analytical techniques are now becoming available to separate various forms of inorganic and organic tin which promise more accurate human exposure assessment. Chemical equations 2Na + C6H5Cl C6H5Na + NaCl 4 C6H5Na +SnCl4 (C6H5)4Sn + 4NaCl Reagents required: 275 ml of dry toluene (350 ml if wet) 35 ml of chlorobenzene 15 gm of sodium 10 ml of SnCl4 Dry ice Special apparatus required: 500 ml, three neck, round-bottom flask Variac High-speed stirring motor Stirring rod with sharp metal blades Cylinder of argon About 1000 ml of kerosene in pane Extra sintered-glass funnels and filter flask Procedure Fifteen grams of clean sodium chunks and 250 ml of dry toluene are placed in the flask. A thermometer and an argon inlet tube are inserted through one of the side arm of the flask. The other side arm is Stoppard. Insert the stirrer through the main mouth of the flask, taking care of that the stirring blades cannot hit the thermometer and that they are above the chunks of sodium. While stirring gently, and with a slow stream of argon flowing, heat the contents slowly to 105 °. Then lower the stirrer so that the blades are about 1cm from the bottom of the flask and turn the stirrer on full power. It will be found necessary to increase the power input to the heating mental in order to keep the temperature at 105 °. After about 10 min of vigorous stirring at 105 °, remove the heating mantle from the flask. When the temperature has fallen to 99 °, stop the stirrer and allow the flask to cool to room temperature. The sodium should now be in the form of fine sand. Stir the sodium ge ntly to see if any of the particles have agglomerated. If so, the process must be repeated. If the sodium dispersion is not be used immediately, thoroughly flush the flask with the argon and tightly stopper it. Using the heating mantle, heat the dispersion, with moderately vigorous stirring, to 45 °. Attach a dropping funnel containing 35 ml of chlorobenzene to the unused side arm and add 2 to 3 ml of the chlorobenzene to the flask. Notice: The flask should never contain more than 3 ml of un reacted chlorobenzene! If more than this amount is present, an uncontrollably vigorous reaction may take place, resulting in a fire. Remove the heating mantle from the flask. The reaction should start, as evidenced by a rise in the temperature. If the reaction does not start at 45 °, cautiously rise the temperature to 50 ° (no higher!). If the reaction starts at this temperature, the temperature may suddenly rise to as high as 55 °, so be ready to cool the flask quickly with the kerosene bath. (If the reaction does not start at 50 °, cool the flask to room temperature, cautiously hydrolyze the mixture with alcohol, and discard). Temperature in access of 50 ° will not cause great harm at the beginning of the synthesis, but thereafter the temperature must be kept below 45 °; keep the flask partially immersed in the kerosene bath and cool the kerosene bath by occasionally adding pieces of DRY Ice to it. The temperature of the reaction mixture may be held between 40 and 45 ° by adjusting the rate of addition of chlorobenzene. After all the chlorobenzene has been added (about 1 to 2 hours), place a solution of 10ml of stannic chloride in 25ml of toluene in the dropping funnel, and, over a period of 30 min, add this solution to the reaction flask. During this addition, it is necessary to cool the flask so as to keep the temperature below 45 °. The flask now be stored indefinitely (without protection from the air) until the tin tetra phenyl is extracted from the mixture. Wipe the kerosene from the bottom of the flask, and, with moderate stirring, heat the mixture to incipient boiling and quickly filter through a sintered-glass funnel. It is best to keep most of the solid residue in the reaction flask. Cool the filtrate to room temperature and filter off the product on another sintered-glass funnel. Return the filtrate to the original flask and repeat the extraction two or three times until no more product precipitates on cooling the solution to room temperature. It is helpful to add another 100 ml of toluene to the mixture to reduce the necessary number of extractions. The final solution should be cooled in an ice bath before filtering. Suck the crystals of tin tetra phenyl as dry as possible on the filter and then let them air dry for 4 to 20 hours on a watch glass. A yield of about 25 gm of material melting at 266 to 228 ° should be obtained. A pure product (melting at 299 °) may be obtained by re crystallization from benzene or toluene. RESULTS AND DISCUSION Physical data for reported compounds are given in Table 1. Compound # Empirical formula M.P ( °C) Solubility % Yield 1. (C6H5)4Sn 110-112 Toluene, Ethanol, Chloroform 72 IR spectroscopy IR is one of the most important spectroscopic methods used for qualitative and quantitative analysis. It is based on the fact that each compound has its own unique spectra and certain functional groups absorbat about the same wavelength even in different molecules. Its single most important use has been for the identification of organic compounds whose spectra are generally complex and provide numerous maxima and minima that are used for comparison purposes. Indeed in most instances the IR spectrum of the compounds especially of organic compounds provides a unique finger print, which is readily distinguished from the absorption pattern from all other compounds because only optical isomers absorb in the same way. Absorption of IR radiation is confined largely to molecular species for which small energy differences exist between various vibration and rotational states. As for as spectrum is concerned we see a prominent peak at 457cm-1, which indicates the formation of metal to carbon b ond, which shows the formation of our product. For aliphatic CH peak appear at 3057 cm-1 . References P. Powell, Principles of Organometallic Chemistry, (1988), 2nd edition, Chapman and Hall, New York, pp-1-10. T.Mole and E.A Jaffery, Organometallic Compounds, (1972), 3rd edition, Elsvier Publishing Company, London, pp.89-92. F. Albert and Geoffrey Wilkinson, Advanced Inorganic Chemistry, (1962), 3rd edition, Interscience Publishers, New York, pp-310-312. J.C Bailar, H.J Emeleus, S.R Nhylom and A.F Trotman, Comprehensive Inorganic Chemistry, (1973), 2nd edition, Prgmon, New York, pp.153-157. J.C Bailar, H.J Emeleus, S.R Nhylom and A.F Trotman, Comprehensive Inorganic Chemistry, (1973), 4th edition, Prgmon, New York, pp.89-93. J.W Robinson, Undergraduate Instrumental Analysis, 5th Edition,(995), Marcel Dekker, New York,pp.166-168. A.U Rehman, Nuclear Magnetic Resonance, 1st edition,(1989),pp.90-93.

Photochemical Degradation of Pharmaceutics Experiment

Photochemical Degradation of Pharmaceutics Experiment Experimental Methodology Experimental methodology executed for accomplishment of a project is one of the most important parts of study, deciding the ultimate outcomes of the study. For the present study It aimed at metal doped MCM-41 for the removal of pharmaceutics by then degradation under UV irradiation. The present investigation was therefore designed to avoid discrepancies as much as possible, and to maximize the outcomes. The photochemical degradation of pharmaceutics has become an important index in ecological environment safety evaluation of drugs. To elucidate the photodegradation profiles of drugs in the environment, many investigators have focused on solution photolysis in organic solvents or in a dilute aqueous solution. The present study was based on photo degradation of two commonly used pharmaceutics i.e., salts of diclofenac and atorvastatin in different solvents. Another perspective of the present study was to determine the metal dopped mesoporous silicates materials as catalyst for the photo degradation of pharmaceutics under UV radiations, sunlight and in absence of light. The details of the experimental methodology adopted are spelled out as under: 3.1 The glassware/ volumetric Apparatus The proper and appropriately cleaned and calibrated glassware and volumetric apparatus is necessary for accurate and precise analytical measurements. Thus, high quality pyrex glass-ware was used during the course of experiment. This apparatus was given through wash with detergent solution, diluted HNO3 and finally with distilled water. All the glassware used was dried at 100oC in an electric oven before use. All the apparatus like beakers, measuring flasks, pippets and graduated cylinders were calibrated prior to use. 3.2 The Reagents Synthesis of mesoporous silica, metal dopping on synthesized mesoporous material and degradation studies required various reagents. In addition to other parameters, the success of experimental methodology also depended on their purity and quality. So in order to ensure quality analytical grade chemicals which were purchased from Uni-chem (China), E.Merk (Germany), Riedel-deHaen (China) and Sigma Aldrich were used. Sodium silicate, cetyltrimethyl ammonium bromide (CTAB), H2SO4,(NH4)2 Ce(NO3)6, Cu(NO3)2.3H2O and copper acetate were obtained from sigma Aldrich with a crtified purity of 99.9%. In order to avoid any photo degradation, all the reagents were kept in dark. 3.3 Equipments/ instruments used a. The following equipments were used for the successful completion of the present study. Magnetic stirrer/ Hot plate Oven Shaker Muffle furnace UV-irradiator pH meter b Instrument Used UV- Visible Spectrophotometer The spectro photometric measurements were performed on a UV–visible double-beam spectrophotometer (U-2800). It operates on the principle of measurement of the intensity of light after passing through a sample (I) and comparing it to the intensity of light before it passes through the sample (Io). The ratio (I/I0 ) is called the transmittance, and is usually expressed as a percentage (%T). The absorbance, A is calculated by the following equation: A= log (%T/100) The basic compartment of a spectrophotometer include; light source, sample holder, a diffraction grating or monochromator to separate the different wavelengths of light, and a detector. The radiation source is often a tungsten filament (300-2500nm) and a deuterium arc lamp, which is continuous over the ultraviolet region (190-400nm). More recently, light emitting diodes (LED) and xenon arc lamps for visible wave length have also been incorporated. The detector is typically a photodiode or CCD (charge couple device detector to enhance the uv spectrophotometer performance). Photodiodes present with monochromators filter the light so that only light of single wavelength reaches the detector. Diffraction gratings with CCDs collect light of different wavelength on different pixels. 1og10Io/I= Æ lc Æ = greek letter, epsilon l= length of solution the light passese through(cm) c = concentration of solution (mol dm-3) The expression 1og10Io/I is known as the absorbance of the solution and is measured by the spectrometer. For the present study the UV spectrophotometer was used for determining the degradation of different pharmaceutical products under different conditions. For this purpose the absorbance of diclofenac sodium was recorded at a wavelength of 276 nm and that of atorvastatin was recorded at wavelength of 246 nm. c Bruker alpha ATR spectrophotometer The Platinum ATR is a single reflection diamond ATR sampling module that is designed to significantly ease analysis. The ergonomic one finger clamp mechanism simplifies the sample positioning. The robust diamond crystal allows analyze nearly all kind of liquid and solid samples. For the present study the IR analysis of MCM-41, Cu/MCM-41 and Ce/MCM-41 was c SDT-Q600 Thermo Gravimetric Analyser The TA Instruments SDT-Q600 Simultaneous TGA / DSC provides simultaneous measurement of weight change (TGA) and true differential heat flow (DSC) on the same sample from ambient to 1,500  °C. It features a field-proven horizontal dual beam design with automatic beam growth compensation, and the ability to analyze two TGA samples simultaneously. For the present study the thermogravimetric analysis of mesoporous silicate was: 3.2 Analytical Methodology 3.2.1 Preparation of mesoporous silica For the preparation of mesoporous silica the method of Taron et.al was used. [i] In this method the sodium silicate was used as a source of silica and cetyltrimethyl ammonium bromide (CTAB) used as a surfactant. Briefly, a 15.75g part of sodium silicate was dissolved in 45.75g of DDW and stirred for 15 minutes at room temperature in a poly propylene container (A). A 13.535g of CTAB was separately dissolved in 200 ml of doubly distilled water at room temperature to prepare an aqueous solution of CTAB (B). To a stirred solution of precursor (A), the template solution (B) was added drop wise. After the completion of addition, the solution was further stirred for about 1h. Subsequently the pH of the contents was maintained at 10.5 by using 1:1 H2SO4, (6.7ml) which yielded a gel that was further stirred for about 45 minutes. The polypropylene container was then sealed and allowed to age for twenty four hours at room temperature without stirring. The gel thus obtained was filtered, washed with doubly distilled water to get rids of ions present as impurities and dried in an electric oven at 120oC. Thus dried product was allowed to calcine at a heating rate of 3oC/min for 6 hours while maintaining a maximum temperature of 550oC. The product obtained after calcinations was mesoporous silica MCM-41, that was used for further experiments. 3.2.2 Metal impregnation of mesoporous silica a) Preparation of CeO2/MCM-41 Li et.al method was adopted for the synthesis of MCM-41/CeO2.[ii] This is based on grinding of precursors. In this method, 0.6402 g of (NH4)2Ce(NO3)6 and 0.3g of synthesized MCM-41 were placed in a mortar and ground significantly at room temperature conditions. The obtained solid was calcined at a heating rate of 5oC/min until the maximum temperature obtained 550  °C in air for 3 to 4 h to remove the surfactant molecules[iii] b) Preparation of copper supported mesoporous silica (Cu/MCM-41) The copper was loaded on the mesoporous support material through wet impregnation of silica. 2g of silica was stirred in 0.025M of 20mL copper acetate for 24 hours at room temperature. The copper impregnated silica was washed with distilled water to remove free copper and acetate ions and then dried at 70oC for 12h. The copper impregnated silica was calcined at 600oC for 4 h to get silica supported copper sample (Cu-MS).[iv] c) Preparation of Cu-dopped MCM-41 with different percentages: The MCM-41 mesoporous powder material after drying at 120oC over night was impregnated with solutions of different concentrations separately under continuous stirring for 12 h at room temperature, and then they were dried at 100oC. The obtained materials were calcined in air from room temperature to 150oC at 5oC/min and held at 150oC for 1 h, and then heated from 150oC to 250oC at the rate of 5oC/min and held at 250oC for 1 h, at last heated from 250oC to 330oC at 5oC/min and held at 330oC for 2 h. By using this procedure, samples containing 5, 10 and 15 wt% Cu-MCM-41 was prepared. [v] 3.2.3 Degradation studies Preparation of Pharmaceutics Standards Pharmaceutics Stock Solution Preparation A primary standard solution of pharmaceutics with concentration 1000 ppm was prepared by dissolving 0.1 g of pharmaceutics in 100 mL of solvent. The solution was kept in refrigerator at 4oC prior to use. Pharmaceutics Spiking Solution Preparation The intermediate standard solutions of pharmaceutics were prepared by diluting 0.5, 0.4. 0.3, 0.2 and 0.1mL of 1000ppm of stock solution upto 10mL of solvent to prepare 50, 40, 30, 20 and 10 ppm of standards. Effect of light Effect of time Effect of metal Effect of metal loading levels Effect of pH REFERENCES: [i] H. W. Lee , H. J. Cho , J.H. Yim , J. M. Kim , J.K. Jeon , J. M.Sohn , K.S. Yoo , S.S. Kim , Y.K. Park , Removal of Cu(II)-ion over amine-functionalized mesoporous silica materials, Journal of Industrial and Engineering Chemistry (17) 504–509(2011) [ii] H. R.Pouretedal, M.Ahmadi, Synthesis, characterization, and photocatalytic activity of MCM-41 and MCM-48 impregnated with CeO2 nanoparticles, journal of International Nano Letters, 2:10(2012) [iii] (Li, Y, Yan, B, Functionalized mesoporous SBA-15 with CeF3: Eu3+ nanoparticle by three different methods: synthesis, characterization, and photoluminescence. Nanoscal. Res. Lett. 5, 701–708 (2010). [iv] Manish dixit, Manis mishra, P.A.Joshi, D.O.Shah, â€Å"Study on the catalytic properties of silica supported copper catalysts†, journal of procedia engineering, 51, 467-472(2013). [v] Ye Wan, Chao Chen, Weiming Xiao, Lijuan Jian, Ning Zhang, â€Å"Ni/MIL-120: An efficient metal–organic framework catalyst for hydrogenation of benzene to cyclohexane† , Microporous and Mesoporous Materials 17, 1 9–13(2013).

Kadohatas The Story Devils: An Overview :: essays research papers

Kadohata's The Story Devils: An Overview   Ã‚  Ã‚  Ã‚  Ã‚  The Story Devils, by Cynthia Kadohata is a look into the life of a young girl looking to protect her family in any way possible. The story is based on a real life experience of the author and shows how we can, at times, let the devil in ourselves come out and play. The author, now living in Los Angeles, writes this as almost a warning; but the reader gets the feeling that she would do what she did again, in a second.   Ã‚  Ã‚  Ã‚  Ã‚  The story takes place after World War II in the town of Chesterville, Arkansas. It was a small town with small town problems, and had a Japanese community living within it. The story was written in 1989 and reflect the uncertainties of the post World War II period. Within the small community there lived a woman that had been through a recent divorce, and was raising three children, Kate, the author, and her brother Sean. Because the mother is having a problem making ends meet, she begins to go to church and meets the antagonist, Mr. Mason.   Ã‚  Ã‚  Ã‚  Ã‚  The story is told by the author in the body and mind of an eight year old. It is a first-person narration and she is playing the part of the protagonist. The point of view remains constant throughout the story, which gives you only the viewpoint of the author to get facts from. Although this may be a possibly unreliable perspective, due to selective memory, the story is told in a straightforward manner suggesting truth and honesty.   Ã‚  Ã‚  Ã‚  Ã‚  During the story the author realizes that Mr. Mason is a violent man. This is learned through several instances, such as when he forced the mother into a crying fit in her bedroom in the beginning of the story. He was also violent when he threw a rock at a young boy that had wandered over to the yard to play. These incidents forced the author to do something that she did not relish, but deemed necessary in order to save her family from this man; since she new her mother was planning on marrying him. She lied to her mother and told her that Mr. Mason had hit her. At first it wasn't believed, but when her quiet sister Kate backed up her story, the mother sought to separate herself from this man. The family moved to Chicago and the author never saw Mr. Mason again.   Ã‚  Ã‚  Ã‚  Ã‚  As was stated before, the story was believable because of the author's almost relenting of a story that she had kept inside for a long time.

Contemporary Performance Issue Essay -- essays research papers fc

A Contemporary Performance Issue   Ã‚  Ã‚  Ã‚  Ã‚  Commuting is a perfect example of a contemporary performance issue, â€Å"traffic congestion can steal valuable time from employees’ personal lives† (Wells par. 1). The typical employee is concerned with the time lost in commuting to work and not spent at home with their family. The family could be spouse, children, pets, parents, siblings etc.†¦If your everyday lifestyle started with the concern and time wasted just for commuting to and from work, you already started the day with a strike against you. In the past, this was not an issue with the employer. The employer was concerned with what they had control over at the workplace, if you had other problems, leave them at the door. Lately, it has been pointed out that more can be done for the employee in the field of Human Resources (HR). For example, instead of open parking for everyone at the work place, initiate a preferred parking area for those using some type of car pool. This encourages a social environment to and from work, as well as relieving some employee stress. If all of the employees are in some type of rotating pool, then an extra load of stress is being relieved from some of the employees all of the time, or all of the employees some of the time. Either way you look at it, you can hope to see an increase in concentration and performance. As an added incentive, â€Å"The Transportation Equity Act for the 21st Century (TEA-21), enacted in June 1998, allows employers to offer workers either cash or tax-free reimbursements for parking, mass transit fares and van pooling expensesâ€Å" (Wells par. 3). This is further enhanced for the employer since the Clean Air Act of 1990. There are about 100 metropolitan areas that mandate air quality goals by reducing vehicle emissions that cause pollution. Some states like California have districts that require employers with 250 or more employees to adopt clean air measures to include trip-reduction programs. All of this results in employees no longer being concerned with traffic or parking or fuel expenses. This is an attractive incentive for retention and also as a recruiting tool. The advantages of adopting a strong program as part of an overall benefits package are clear. Here are some examples of how some organizations have put this to use: ? Bethesda, Md.-based Calvert Group Ltd. estimates that it cut emp... ...’ flex schedules. A third of the companies surveyed by Mercer, up from just 6 percent as recently as 1993, offer employees the option of working at home, with modem-equipped computers linking them to the office. More than a fifth say they are considering such a program. Retailer J.C. Penney, for example, has found that home-based telecommuters are the answer to its on-call operations. Recruited in-house from the company’s telemarketing staff, the part-time workers are supervised by phone, e-mail and twice-monthly visits. Prediction: Between 7.5 million and 15 million workers will telecommute three to four days a week by 2002, according to projections by the U.S. Department of Transportation’s Bureau of Transportation Statistics (Wells par. 5). I think that with today’s traffic congestion, both the employee and the employer would benefit by having some type of incentive that is geared to commuting. HR is no longer just at the work place. Maybe it never was. Today, we can find all sorts of programs as incentives for the work force. Are they new or are we just no longer thinking in the box? Works Cited Wells, S. J. (1999), â€Å"Using rush hour to your advantage.† HR Magazine, March 1999.

What is a Dream? Essay -- Literary Analysis, Shakespeare, Carroll

Your eyelids are heavy and your mind is fogging, finally they close entirely with the weight of the eyelids, and in a few minutes you have fallen into slumber. You wake up with a vivid image in your mind, but you have no clue as to what it means: it was just a dream. A dream, some may argue is irrelevant; images assorted together creating nonsense. Others depict a dream as a message our mind is telling us. Throughout the day, the mind subconsciously picks up pieces of our daily life, whether they are thoughts, emotions, ideas, or interactions. The brain naturally resists chaos and is attuned to order and organization and, therefore, sees past the commotion and malfunctions, it begins to matrix things, such as images in the clouds. It is through dreaming that these images sort out all the confusion in the ordinary daily life and reveals a bizarre and unrealistic world, which is a reflection of the unstable reality that is actually lived in. Reality is considered unstable because it is constantly changing, moving and transforming into something else whether people are aging, dying or being born. It is a constantly changing factor that people refuse to accept, and it is in our dreams that it is revealed. It is in this dream world where William Shakespeare and Lewis Carroll use fantastical characters, such as fairies and the White Rabbit to exemplify the daily interactions one must make to seek the truth. It is in the court and woods where everything is turned upside down, and where what is right is wrong, and what one knows, are no longer relevant. Ultimately these dreams illustrate the absence of time within these worlds. The dream process plays an essential function in both Shakespeare’s A Midsummer Night’s Dream and Carroll’s Alic... ...nuously move to get somewhere and when they find they are looking for, they still have to keep going. The characters met through the journey represent the logical and illogical strangers that people face every day and some may help while others might pull them down. These interactions are significant because every interaction and actions affect a person even if it is not all that clear. Time is the biggest factor in how reality is unstable. No matter what a person does, time is constantly there, and every second is a second past. The main reason it is not stable is because it is always changing and moving and whether one likes it or not, no one can change time. In a dream, time is not a factor and characters met can have no significance and in a dream, just for those few hours, the world can be a perfect and stable place, at least just until it is time to wake up.

Teaching To Be A Successful Teacher Education Essay

Pattern of learning and larning are altering from twenty-four hours to twenty-four hours with alteration in pupils behaviour. In olden yearss, teacher is one who inculcates the cognition in scholar through instructing, but as the coevalss changed, learning profession has besides seen batch of alterations ; it has become one of the most of import professions that have batch of impact on society. Teaching has become more of sharing than merely teaching. As a hereafter instructor, I should be able to get by up with this altering scholar ‘s behavior and should learn them in the manner they understand better and demo maximal end product. In the words of former Indian president, Scientist and now functioning as professor at one of the top universities in India, Dr. A.P.J Abdul Kalam â€Å" Educationists should construct the capacities of the spirit of enquiry, creativeness, entrepreneurial and moral leading among pupils and go their function theoretical account † . These were the chief motivational factors that created the passion of learning in me. I believe that I can construct assurance in pupils to come frontward to show themselves, promote them in stand outing in surveies and their field of involvement. From my experience as a pupil, I learnt that non all the pupils will be take parting in the same manner in the category and it is hard for teachers/ professors, to concentrate on peculiar pupils ‘ advancement. Hence, I believe that, I as a instructor should be capable of managing these type of jobs sanely and do certain that all the pupils improve their accomplishments and take part actively in schoolroom.Personal BiographyAs a pupil and good perceiver, I have been detecting different techniques and methods used by instructors to affect pupils in the category. As an MBA pupil in international concern school, I got the rare chance of larning different learning accomplishments of professors from different states round the universe. The manner the y teach, their interaction with pupils, their handling of different cultural issues ( as pupils are from different parts of universe ) , their handling of capable and helping pupils in using the theory to show concern universe made me more passionate towards taking this learning class. Their presence in the category would do pupils delighted and more interested towards topics.Ideas, beliefs and valuesTeaching has changed from merely accretion of facts through teaching process to developing scholars ‘ ability by helping them to believe critically and experiment. I still retrieve the college yearss, where my instructor Mrs. Fareed used to take particular attention of every pupil personally. She is one of the most powerful instructors I have of all time met. She has all the qualities that a instructor has to hold. She merely does n't used to learn us, she used to demo a practical concrete image in forepart of our eyes and therefore doing it easier and interesting. It ‘s bee n long clip, I departed from her, but her influence is still on me. . This form of learning through imaginativeness is a proved success factor. Whitebread ( 1929 ) , a celebrated philosopher from Harvard University, in his work â€Å" The purpose of instruction † stated â€Å" Imagination can non be measured or weighted and so supplied to pupil. It is an art that should be possessed by instructor and communicated to scholars in an orderly manner † . Whitebread ( 1929 ) work on instruction system is still taken as standard by many writers and philosophers. I would be uniting my experience as a pupil with the acquisition from these class and model myself into good instructor. I will seek to make an environment where pupils can interact with me ( teacher ) , and other pupils sing topic and better their ability in the countries that they are excited about. Because I believe that the acquisition would be successful, merely when it is meaningful. Here, I would wish to advert about my HRM professor Mrs Marian Sullivan ( guest module ) from Coventry, who has 25 old ages of industry and academic experience is so down to earth, that she is ever ready to welcome new thoughts from pupils and even larn new things from them. These characteristic in her, taught me that the ability of learning prevarications in the ability of larning. I will seek to larn new thoughts from pupils and would promote their engagement in category to convey out their creativeness. While reading through one of the articles by philosopher Mitchalak ( 1986 ) , I noticed him indicating out this art of doing pupils take part in categories is most important for being a successful instructor. He qu oted â€Å" Students should be motivated to go active scholars in category, or else, they will neither develop thought accomplishments nor engage in the category † . I will help in constructing assurance in the pupils and do schoolroom activities more interested by accommodating the instruction form, in which pupils are interested in. I besides strongly back up parents / defenders engagement in pupil acquisition accomplishments. I do n't waver to be in regular contact with parents about pupils ‘ advancement and their engagement in community activities. Learners get inspired by parent ‘s activities, functions and milieus ( neighbours, and friends ) . Harmonizing to me, parents are the first instructors in one ‘s life. Hence, I encourage parent ‘s engagement in pupils larning life. This is non merely my thought towards instruction, but it ‘s a proved fact. In one of the research conducted by William and Chavkin, they found the fact that â€Å" The more parents take part in schooling, in a sustained manner, at every degree, the better for pupil accomplishment † . Before fall ining the class, I had the basic thoughts of learning from my instructors and professors. These thoughts lighted the fire of passion for learning in me. After fall ining the class, I realised that it ‘s non merely about learning, but about sharing cognition, larning new things every twenty-four hours, altering with twenty-four hours to twenty-four hours and actuating myself and many people around me. Harmonizing to me, scholars are influenced by many factors around them. Few of them include societal safety, schoolroom environment, their personal demands and most significantly societal life. I have besides learnt that my thoughts towards learning are non merely plenty to be a good instructor and these thoughts demands to be changed harmonizing to today ‘s and in fact mundane altering single behaviour. Teachers play a important function in every 1 ‘s life. Students and society expression at instructors for alterations in present coevals. They would be the first individual to be pointed out at, when scholars does n't execute good in community. While reading through different articles on instruction and todays educational alterations, I have come across my doctrine of instruction is merely what is followed by most of the instructors around the universe. The doctrine â€Å" The art of learning prevarications behind the art of acquisition † is implemented by many instructors around the universe. Brookfield ( 1990 ) , in his work â€Å" the adept instructor † , explained this doctrine as one of the best doctrines possessed by instructors in present coevals. He mentioned that â€Å" the successful instructor is one who is able to larn from pupil and do pupil take part in category activities successfully † . Teacher, who has excellent learning accomplishments wo n't acquire success until pupil participates in schoolroom activities. By the terminal of this class, I would turn out myself to be successful instructor and scholar and get down my new calling by helping scholars to accomplish their ends. In today ‘s universe, where engineering is playing cardinal function and instructors have to accommodate with these turning engineering to make pupils good. At higher secondary schools, about all pupils, might lose giving a reading to their notes, but non lose their inbox in mail. Teachers in US and UK are following up with this tendency. Some instructors are utilizing chirrup to remind pupils of their prep and some instructors are utilizing Facebook to reach pupils, clear up uncertainties and mentor them. Governments are besides taking enterprises by carry oning extended researches on instruction system. They are in uninterrupted dialogues with instruction suppliers ( schools, colleges, universities ) to do certain that instruction is up to criterions. Encouraging pupil creativeness is besides of import for today ‘s changing universe. Students should be given opportunity to experiment theories. They should be allowed to portion their thoughts with everyone. This environment encourages advanced thoughts in scholars, which helps development of state. In words of A.P.J Abdul Kalam, â€Å" Teachers play important function in developing state with beautiful heads † . By the completion of this class, with the accomplishments gained I can travel against any challenge in Mauritanian instruction system and impart scholars with assurance and accomplishments. There have been many arguments against the instruction system in schools. Students are afraid of doing wrongs or giving incorrect replies, which finally is doing them to lose their assurance. Sir Ken Robinson, in his talk show on TED, blamed schools and instruction system, for killing creativeness in pupils by non promoting them. He farther added â€Å" you will ne'er come up with something advanced and utile, unless you are non prepared to be incorrect † . Students should be encouraged to talk out in the category, from these small beautiful heads, originative thoughts develop in hereafter. Here, I would wish to remind the words of Linda Lumsden ( 1994 ) , who has done a batch of research on pupil motive towards acquisition. Harmonizing to her â€Å" Motivation is successfully gained by general experience, but largely, it is straight related defining and communicating of outlooks, and direct direction or socialization through others ( chiefly, parents and Teachers ) † As I stated earlier, to accomplish good consequences, instructor and scholar should work together. As a instructor, I will ever maintain in head that both learning and larning are straight related to each other and when tied together decently and planned good, they can take to first-class result.

Is College Education Worth It

Is College Education offlay It? Hailey mulligan October 24, 2012 Organization Communication MG320 Is College Education Worth It? Getting a penny-pinching trade is non straightforward as it utilise to be. In past generations, some matchless(prenominal) in an entry-level space could work their way up the campaign just through pro base work and determination whether or non unity had credentials or a sheepskin mattered very little. This is not the episode today. Higher genteelness is now fine to bring forth oneselfing a better capriole beca manipulation the beseech for skilled restriction is acclivity.For this reason, the assess that a detail offers is advanced than that of ones actual intelligence or merit. Further to a greater extent than, doers with egress college decimal points leave quickly be let onpaced in position and salary by story holders. Earning a college percentage point is no longer simply an option for potential job seekers, but a necessit y for those wishing to forward motion in their cargoners. With the cost of postsecondary in operateation go in leaps and bounds, potential students may love if the college education system is still charge investing in.Niall Ferguson (2012) states that at a archetype of public colleges, average tuition and fees for in-state residents guide locomote by 25 percentage since 2008 for private schools, these tuition and fees rose by 13 percent (p. 20). Similarly, over half (56 percent) of students be enrolled at four category schools with tuitions and fees of up to $9,000 a year with high-altitude institutions business relationshiping costs upwards of $40,000 annually (Walker, 2010, p. 28). Although this cost has been offset for some students by the amplification in government championship for education in the form of grants and entitlements, postsecondary get downs do-nothing be daunting.Yet, findings discussed later in this report reveal the vital importance of a c ollege horizontal surface, not scarcely in short-run job hunts but as a long-term investment over ones life fourth dimension. First, the direct for skilled labor has turn upn in America. According to bouncing and Turner (2010), collegiate attainment has not kept pace with ontogenys in the regard for skilled workers in the United States (p. 7). Although in that respect has been a signifi bungholet increase in the number of college attendees, the number of students actually finish a college gradation has not increase proportionately (p. 7). wizard possible argument for the rising demand of college graduates is the reduction of blue-collar jobs as this nation moves into a engineering and information-based economic market (Carnevalle, 2006, p. 90). Bankston (2011) says this trend might be consistent with the argument that advances in technology father created a rising demand for advanced credentials (p. 337). Other origins acknowledgment examples of how a peeled(a) tech nology may require that people have a form to provide a harvest or service for which a stage was un needful ten years past (Whitaker and Zenker, 2011, p. 21).Others argue, however, that demand for jobs that require a college point in time is simply a self-perpetuating result of the increase in college graduates. In 1940, barely tailfin percent of Ameri derrieres held a college ground level by 2008 that number had risen to 30 percent (Bankston, 2011, p. 326). One author credits the rise of point requirements to the harvesting of government subsidies in the market of postsecondary education (Bankston, 2011, p. 336). As the government gives more than property in the form of Pell grants (which has now been deemed an entitlement), more students attend college and obtain full stops.Bankston reasons that one would stand that as credentials flood the market, they leave behind purchase fewer opportunities (p. 336). Over magazine this may mean that the value of a college degree may diminish and the shot in income and job opportunities between graduates and non-graduates ordain decrease. (p. 336). It may withal mean that having entirely a bachelors degree will not be adequate to secure a comfortable career. Debra Stewart, chairwoman of the Council of Graduate Schools, claims that over the course of a lifetime, people with masters degrees earn 18 percent more than those with baccalaureate degrees (Loftus, 2012, p. 3). For now though, the rise of credentialed job seekers has led to the thought that higher education is an apprehension for everyone.Because having a degree has occasion so crude, employers now use it as a way to refuse people who would not make good medical prognosiss for employmenteven if a degree isnt a totally complete determinant of ones genius or work skills. The mass availableness of college education may actually sink its intrinsic value (Bankston, p. 338). Although someone without a degree may have more natural intelligence a nd aptitude than their credentialed ounterpart, a degree is now price more than actual cap talent in the job market. Bankston writes that the popular emphasis placed on higher education in a society in which higher education has become a broad expectation has heightened the importance of credentials as an addition for obtaining a job at the expense of other assets, such as demonstrate ability or experience in a field (p. 337). A degree provides a form of merit that employers advert for immediately because the degree marks the individual as someone who can supposedly meet deadlines, fulfill obligations, and think critically.Margolis (2007) remarks how it was the common practice of my colleagues to immediately sift out the absorbs that didnt have a degree and just throw them away (p. 42). Because many employers are searching through high volumes of resumes, they dont have time to thoroughly formulation at every single one they speed up the process by simply filtering out non-gra duates. This point is exemplified further in the show window of Marilee Jones. The former dean of admissions at the milliampere Institute of Technology (M. I. T. ) quickly resigned afterward it was discovered she did not actually have the credentials listed on her resume (Kinsley, 2007).Even though she started as a clerical worker and advanced in position over 28 years to become the dean at this prestigious school, her talent and the true meant nothing once her padded resume was revealed (Kinsley, 2007). She simply lacked the paper qualifications M. I. T. based itself upon. Although these qualifications are all artificial substitutes for received merit, some clock the artificial substitute is unavoidable (p. 34). The substitutes are unavoidable when employers, like colleges, do not have the time or ability to gather all the information necessary to determine who will be a successful employee.Even though Ms. Jones demonstrated real merit (p. 34), her paper meritor lack thereofu ltimately headstrong her fate at M. I. T. A college degree stands in the place of ability when ability cannot be measured in a concrete way. Not only can the absence of a college degree chasten ones ability to obtain a job, it can also oppose ones likelihood of promotion in a career. A degree increases ones marketability and maneuverabilitywithout a degree, youre flying by the topographic point of your pants (Kinsley, 2007). Although one might find a job without a degree (based on connections, etc. , the degree provides a cushion. If this job were to be lost, a new job could readily be found because of ones credentials. Furthermore, non-graduates cap out in their careers sooner than graduates. Kinsley notes that you hit that chapiter where a high school diploma only gets you so far in a salary range (p. 34). Bankston also documents the increasing gap since the 1950s in median wage incomes of Americans with and without college degrees (p. 337). The wage indemnity of a college d egree over a high school diplomas increased by 83% since 1979 (Carnevale, 2006, p. 90).Non-graduates have less talk terms power in their positions because they are less valuable to their employer and may therefore be unable to take advantage of an increase in earnings or benefits (Kinsley, 2007). So stringent have the qualifications for employment becomearbitrarily or otherwisethat sometimes just having a diploma isnt even enough. For example, employers are still cautious about the quality of online degrees. Lynn Gresham (2008) notes a spate conducted by Vault. com that revealed nearly two-thirds (63%) of employers still state that they would favor job candidates with degrees from traditional colleges (p. 4). One hiring manager said they didnt debate online degrees reflect a serious cargo to education (p. 24). Currently the perceived value of an online degree is less than that of degrees obtained from brick-and-mortar institutions. However, as more job candidates complete degre es online, employers views on their boldness are slowing changing. For some, the completion of an online degree shows that the person is highly self-motivated to learn new skills and acquire knowledge through uncompromising self-study methods (p. 27). Today, the average American changes jobs eleven times during their adult life (U.S. Department of assiduity Bureau of Labor Statistics, 2012). For this reason, a person without a college degree would be devastatingly unequipped to survive in todays job market because they lack the tractability to move to new careers. In 2010, non-graduate workers see 10. 4 percent unemployment, while workers with at least a bachelors degree were only unemployed at 4. 7 percent (Whitaker and Zenker, 2011, p. 21-22). Employers still look to see if a job candidate has a degree, even if they exemplify real intelligence.Doors of opportunity that remain open to degree holders will be closed for non-graduates and the ladder of advancement will only r un into so high. Diplomas are a form of meritocracy necessary in America, even if only arbitrarily. While the intrinsic value of a college education may be fade because of its mass production, its extrinsic value stay true. Despite its high costs, college is still one of the best investments a person can make in todays highly competitive job market. financially and opportunity-wise, obtaining a college education is still worth it.