Public School Uniforms Outline Assignment Example | Topics and Well Written Essays - 750 words

Public School Uniforms Outline - Assignment Example However, there has been a rise in a group of people opposing the idea. Critics argue that uniforms do not add any value to the education of the students. They argue that most reforms which proponents cling on are not solely because of the use of school uniforms, but a combination of several reform measures taken by the institution (Draa, 2005). The effectiveness of the policies in terms of law and finance is also questioned (Brunsma et al, 1998). The rapid change of clothing trends that target the youth has created problems among the youth, who are mainly the majority in schools and colleges. There is an unending appetite among the youth to appear fashionable among their peers; hence an increase in unscrupulous means of acquiring the clothes (Draa, 2005). Students who cannot afford such lavish dressing may feel inferior in schools; hence the need of uniforms. Uniforms make everyone equal and eliminate the need of unhealthy competition between students in schools. Competition among the students over their appearance results in taunts and even fights (Holloman et al, 1996). The school community is made up of different kind of people, from different backgrounds. Allowing the students to dress up as they wish would make the school environment look chaotic. Different communities have their own unique dress codes; that could be their tradition and due to lack of exposure and tolerance, students wearing them can be ridiculed by others. The administrators ease the social problems, tension and appearance related issues by embracing the use of uniforms (Draa, 2005). The use of school uniforms is for the safety of the children themselves. According to Draa (2005), there are cases where school-age children are robbed or even killed for their shoes and clothes which are of high demand. The role of uniforms in the prevention of violence is framed as a safety issue for the students in schools

Sodium Alginate and Polymer Drug Delivery Systems

Sodium Alginate and Polymer Drug Delivery Systems Sodium alginate is a hygroscopic material, although, stable at low humidities and at cool temperatures. Aqueous solutions of sodium alginate are most stable at ph 4-10. Below ph3, alginic acid is precipitated. Sodium alginate solutions are susceptible to microbial spoilage during storage, which may effect on solution viscosity. Subsequent loss of viscosity due to depolarization was observed when sodium alginate was heated above 70Â °c. Preparations containing sodium alginate for external use may be preserved by the addition of 0. 1% chlorocresol, chloroxylenol, or parabens and if the medium is acidic, benzoic acid may be used. Bulk material should be stored in an airtight container in a cool and dry place. Sodium alginate is incompatible with acridine derivatives, crystal violet, phenyl mercuric acetate and nitrate, heavy metals and ethanol in concentrations greater than 5%w/v. Low concentrations of electrolytes cause an increase in viscosity but high electrolyte concentrations causing salting out of sodium alginate; salting out occurs if more than 4% of sodium chloride is present. Sodium alginate is used in variety of oral and pharmaceutical formulations. In tablet formulations, sodium alginate may be used as both a binder and disintegrant. It has also been used as a diluents in capsule formulations and also been used in the preparation of sustained release oral formulations, since it can delay the dissolution of a drug from tablets, capsules and aqueous suspensions. Recently, sodium alginate has been used for the aqueous microencapsulation of drugs in contrast with the more conventional microencapsulation techniques which use organic solvent systems. It has also been used in the formation of nanoparticles. The adhesive nature of hydrogels prepared from sodium alginate has been investigated and the drug release from oral mucosal adhesive tablets based in sodium alginate has been reported. Hydrogel systems containing alginates have also been investigated for delivery of proteins and peptides. Therapeutically sodium alginate has been used in the combination with an h2 receptor antagonist in the management of gastroesophageal reflux and as a haemostatic agent in surgical dressings. Alginate dressings, used to treat exuding wounds often contain significant amounts of sodium alginate as this improves the gelling properties. Sodium alginate is also used in cosmetics and food products at concentrations given in table 4 Safety Sodium alginate is widely used in cosmetics, food products, and pharmaceutical formulations, such as topical products, including wound dressings. It is generally regarded as a nontoxic and non-irritant material, although excessive oral consumption may be harmful. The WHO has not specified an acceptable daily intake for alginic acid and alginate salts as the levels used in foods do not represent a hazard to health. Handling precautions. Sodium alginate may be irritant to eye or respiratory system if inhaled as dust;eye protection, gloves, dust respirator are needed while handling. Sodium alginate should be handled in a well ventilated environment. Related substances The various substances related to sodium alginate include alginic acid, potassium alginate, calcium alginate, propylene glycol alginate. CHITOSAN Chitosan is a derivative of chitin and it is a unique polysaccharide and hydrophilic polymer. Non Proprietary Names BP: Chitosan hydrochloride Ph Eur : Chitosan hydrochloridum Chemistry Preparation The principle derivative of chitin, namely Chitosan (C6H11O4N)n is a unique polysaccharide and hydrophilic polymer which is taken from the chitin, a polysaccharide found in exoskeletons of crustaceans. it is processed by removing the shells from shellfish such as shrimp, lobusters and crabs. The shells are then ground into a pulverous powder. This powder is then deacetylated. This involves boiling chitin in concentrated alkali (50%) for several hours. This will yield chitosan with a degree of acetylation between 20-30%, the most popular commercial form of Chitosan. In such a chitosan, the acetyl groups are uniformly distributed along the polymer chain. This is in contrast with the Chitosan of similar degree of acetylation, but isolated from fungal cell walls in which the acetylresidues are grouped into clusters. Special chemical treatments are required to obtain completely de-acetylated forms of chitosan. CHITIN Functional category It is used as a coating agent; disintegrant; film forming agent; mucoadhesive, tablet binder; viscosity increasing agent etc. Chemical character Chitosan is a cationic polyamine with a high charge density at ph The amino group in chitosan has a pka value of approximately 6. 5, thus chitosan is positively charged and soluble in acidic to neutral solution with a charge density depend on ph and the %da. Numerous studies have demonstrated that the salt form, molecular weight, and degree of deacetylation as well as ph at which chitosan is used all influence how this polymer is utilized in pharmaceutical application. Chitosan is incompatible with strong oxidising agent. Typical properties Chitosan is a cationic polyamine with a high charge density at ph Acidity / alkalinity pH=4-6(1%w/v aqueous solution) Density 1. 35-1. 49g/cm3 Particle size distribution Stability and storage conditions Chitosan is a stable material at room temperature although it is hygroscopic after drying. Chitosan should be stored in a tigjtly closed container in a cool and dry place. Incompatibilities Chitosan is incompatible with strong oxidizing agents. Safety Chitosan is being investigated widely for use as an excipient in oral and other pharmaceutical formulations. It is also used in cosmetics. chitosan is generally regarded as biodegradable, nontoxic and non irritant material. it is biocompatible with both healthy and infected skin. Applications Chitosan is found useful in many fields like sustained drug delivery, components of mucoadhesive dosage forms, rapid release dosage forms, improved peptide delivery, colonic drug delivery systems and use for gene delivery. Chitosan is processed into several pharmaceutical forms including gels, beads, films, microspheres tablets and coatings for liposomes. PROPRANOLOL HYDROCHLORIDE (ÃŽÂ ²-adrenergic blocking agents) Adrenergic nonselective ÃŽÂ ²-receptor antagonist. (antihypertensive, antianginal and antiarrhythmic. ) STRUCTURE Chemical name (ÂÂ ±)-1-isopropylamino-3-(1-naphthyloxy) propan-2-ol hydrochloride Molecular formula C16H21NO2. HCl Molecular weight 295. 8 Description: A white powder, odourless and bitter in taste Solubility: Soluble Soluble 1 in 2 of water and ethanol Slightly soluble in chloroform I . PHARMACOLOGICAL ACTIONS a. Cardiovascular-Propranolol diminishes cardiac output, heart rate, and force of contraction. These effects are useful in the treatment of angina. b. Peripheral vasoconstriction-Blockade of ÃŽÂ ²-receptors prevents ÃŽÂ ²2-mediated vasodilation. The reduction in cardiac output leads to decreased blood pressure. c. Bronchoconstriction-Blocking ÃŽÂ ²2 receptors in the lungs of susceptible patients causes contraction of the bronchiolar smooth muscle. Î’-blockers are thus contradicted in patients with asthma. d. increased Na+ retention-reduced blood pressure causes a decrease in renal perfusion, resulting in an increase in Na+ and plasma volume. in some cases this compensatory response tends to elevate the BP. For these patients, ÃŽÂ ²-blockers are often combined with a diuretic to prevent Na+ retention. II. THERAPEUTIC EFFECTS a. Hypertension-propranolol lowers BP in hypertension by decreasing cardiac output. b. glaucoma-propranolo is effective in diminishing intraocular pressure in glaucoma. c. migraine-propranolol is also effective in reducing migraine episodes by blocking the catecholamine induced vasodilation in the brain vasculature. d. angina pectoris-propranolol decreases the oxygen requirement of heart muscle and therefore effective in reducing the chest pain in angina. e. myocardial infarction-propranolol and other ÃŽÂ ²-blockers have a protective effect on the myocardium. thus, patient who have had one myocardial infarction appear to be protected against a second heart attack by prophylactic use of ÃŽÂ ²-blockers. III. ADVERSE EFFECTS a. broncho constriction-when propranolol is administered to an asthmatic patient, an immediate contraction of the bronchiolar smooth muscle prevents air from entering the lungs. Therefore, propranolol must never be used in treating any individual with obstructive pulmonary disease. b. arrhythmias-treatment with the ÃŽÂ ²-blockers must never be stopped quickly because of the risk of precipitating cardiac arrhythmias. c. disturbances in metabolism- ÃŽÂ ² bloackade leads to decreased glycogenolysis and decreased glucagon secretion. d. drug interaction-drugs that interfere with the metabolism of propranolol, such as cimetidine, furosemide and chlorpromazine may potentiate its antihypertensive effects. conversely those that stimulate is metabolism, such as barbiturates, phenytoin and rifampicin can mitigate its effects. PHARMACOKINETICS Propranolol is well absorbed after oral administration but has low bioavailability due to high first pass metabolism in liver. it is highly bound to plasma proteins. Metabolism of propranolol is dependent on hepatic blood flow. DOSE Oral 10mg BD to 10mg QID (average 40-60mg/day) I. V 2-8mg injected over 10min with with constant monitoring. it is not injected S. C or I. M because of irritant property. MATERIALS NAME OF THE MATERIALS NAME OF THE COMPANY Propranolol hydrochloride Sodium alginate AR Hi-Media biosciences Ltd, Mumbai. Calcium chloride AR S. D Fine chemicals Ltd, Mumbai Barium chloride AR Qualigens Fine Chemicals Ltd, Mumbai Chitosan AR Fluca Biochemicals Ltd, Switzerland. (Viscosity 200-400 mPa. s) Acetic acid EQUIPMENTS USED Name of equipment Name of company UV/Vis Spectrophotometer JASCO V-530 IR Spectrophotometer Jasco-FT-IR 8201 PC Differential scanning calorimeter DSC-60 (Shimadzu, Tokyo, Japan) Optical Microscope and Stage Micrometer Erma. Japan Scanning Electron Microscope JSM 6400 x-ray diffractrometer Bruker AXS D8 Dissolution apparatus Electrolab TDT-08L, USP XXIV Type I Apparatus. Chennai Remi Hi-speed motor Universal motors. Mumbai Digital balance Denver Instruments 18002098899 simi INTRODUCTION MICROENCAPSULATION A process in which very thin coatings of polymeric materials are deposited around particles of solids or droplets of liquid. Different terms for solid particle systems are employed in drug delivery among them pellets, beads, microcapsules, microspheres, millispheres are few. The terminologies of most relevant multiparticulate systems are provided here. Pellets can be defined as Small, free flowing spherical particles manufactured by agglomeration of fine powders or granules of drug substances and excipients using appropriate processing equipment. The size of these particles rae usually between 0. 5 and 1. 5mm. sphericity and intra granular porosity are the two important quality attributes of pellets. The terms spherical granules and beads have been applied interchangeably to pellet system. Microspheres are solids approximately spherical particles ranging in size from 1 to 1000ÂÂ µm. They are made of polymeric, waxy, or other protective materials, that are biodegradable synthetic polymers and modified natural products such as gums, proteins, waxes etc. Microsphere: the enbtrapped substance is dispersed throughout the microsphere matrix. Microcapsule: the entrapped substance is completely surrounded by distinct capsule wall. The similiarities between microsphers and microcapsules are clear and illustrations of these particles are shown in Fig: Encapsulation methods Two major classes of encapsulation methods have evolved, viz chemical and physical. The first class of encapsulation involves polymerisation during the process of preparing the microcapsules. examples of this class are usually known by the name of interfacial polymerisation or in situ polymerisation. The second type involves controlled precipitation of a polymeric solution where in physical changes usually occur. The precipitation and or gelation listed in table cover many techniques. one example isthe precipitation of water soluble polymers such as gelatin with water miscible solvents such as isopropranol. other examples include the precipitation of ethyl cellulose from cyclohexane agin by cooling, and gelation of sodium alginate with aqueous calcium salt solutions. in all cases the objective is to precipitate a performed polymer around the core (sometimes a multi-particulate) to cause encapsulation. Process Coating material Suspended medium Interfacial polymerization Water soluble and insoluble monomers Aqueous/organic solvents Complex coacervation Water soluble polyelectrolyte Water Simple coacervation Hydrophobic polymers Organic solvents Thermal denaturation Proteins Organic solvents Salting out Water-soluble polymer Water Solvent evaporation Hydrophilic or hydrophobic polymer Organic or Water Hot melt Hydrophilic or hydrophobic polymer Aqueous/organic solvents Solvent removal Hydrophilic or hydrophobic polymer Organic solvents Spray drying Hydrophilic or hydrophobic polymer Air, nitrogen Phase separation Hydrophilic or hydrophobic polymer Aqueous/organic solvents POLYMER BASED DRUG DELIVERY SYSTEM There has been growing interest in polymer based bioadhesive drug delivery systems. one of the goals of such systems is to prolong the residence time of a drug carrier in the Gastro Intestinal tract(GIT). The bioadhesive bond can be of a covalent, electrostatic, hydrophobicor hydrogen bond nature. ionic polymers are reported to be more adhesive than neutral polymers, and an increased charge density will also give better adhesion suggesting that the electrostatic interactions are of great importance. except for the oesophagus, the entire GI tract including the stomach is covered with a continous layer of insoluble mucus gel. The mucus gel mainly consists of glycolproteins and due to their content of ester sulphate and sialic acid groups, the mucus layer has an overall strong net negative charge. The mucus layer has been considered as a possible site for bioadhesion and drug delivery by several groups. Natural polymers Recently, the use of natural polymers in the design of drug delivery formulation has received much attention due to their excellent biocompatibility, biodegradability, non toxicity and easy in availability. Polymers as carriers used in drug delivery system The different types of polymers for extended release preparations are given below. Biodegradable polymers The biodegradable polymers comprised of monomers linked to one another through functional groups and have unstable linkages in the backbone. They are biologically degraded or eroded by enzymes or generated by living cells. Natural Albumin, alginate, collagen, starch, chitosan, dextran, casein, gelatine, fibrinogen etc. Synthetic Polyalklyl-cyanoacrylate, poly ethyl cyano acrylate, poly amino acids, poly amides, poly acryl amides etc. Aliphatic polyesters Poly(maleicacid), poly (glycolic acid), poly(hydroxyl butyrate), poly (lactic acid), poly vinyl alcohol(PVA) etc. Non-biodegradable polymers Poly ethylene vinyl acetate(EVA), poly ether urethane(PEU), cellulose acetate, poly vinyl chloride(PVC), ethyl cellulose etc. In recent years a lrge number of biodegradable polymers have been investigated for their potential use as drug delivery systems. among them, sodium alginate and chitosan are very promising and have been widely exploited in pharmaceutical industry for sustained drug release. polysaccharides such as alginic acid, agar, chitin and chitosan have been used to agglomerate drugs for controlled drug delivery systems. Chitosan is a anaturally occurring polysaccharide comprosing of glucosamine and N-Acetyl glucosamine with unique poly cation characteristics. The polycationic nature of chitosan leads to a strong interaction with negatively charged alginate. when alginate is dropped into chitosan solution, the electrostatic interaction of carboxylic groups of alginate with the amino groups of chitosan results in the formation of a membarane on the surface of sodium alginate and improves the stability and drug content. This process has been widely used in the preparation of alginate chitosan membaranes with a solid calcium-alginate gel core. There are many advantages of the chitosan coating, such as the improvement of drug loading and bioadhesive property, as well as the prolonged drug release properties etc. Alginate(ionic, hydrophilic polymer) is a negatively charged polysachharide with high charge density and has been reported to be bioadhesive. among polyanionic polymers, alginate has been widely studied and applied for its possibility to modulate the release according to the properties of its carboxyl groups as well as its biodegradability and absence of its toxicity. alginate is a naturally derived anionic polysaccharide mainly from algae belonging to the family of phaeophyceae. Alginic acid is an algal polysaccharide and a species of poly carboxylic acid. alginate consists of two sugar moieties ÃŽÂ ²-D mannuronic acid and ÃŽÂ ±-L guluronic acid which exist either in blocks or random sequences and their relative proportions determines the biofunctional properties of alginc acid. alginate is known to form complexes with divalent cations, such as Ca2+, Ba2+, and Sr2+ in aqueous solution. depending upon the composition of two sugar residues and sequential distribution within the molecules, the complexes form either precipitates or hydrogels. guluronic acid blocks are known to form a rigid buckled structure, the so called egg box array, in which chelating calcium ions are nestled in the aqueous environment of the ordered gel structure due to the spatial arrangements of guluronic block oxygen atoms of carboxyl and hydroxyl groups. Alginate has been widely used as food additive, a tablet disintegrator or gelation agent, and the mechanism of its gelation have been extensively investigated. when an aqueous solution of sodium alginate(SA) is added dropwise to an aqueous solution of calcium chloride, spherical alginate beads with regular shape and size are produced, since an insoluble calcium alginate matrix is formed by the cation exchange between sodium and calcium ions. alginates are known to form reticulated structure when in contact with calcium chloride ions and this characteristic has been used to produce SR particulate systems for a variety of drugs. GEL FORMATION (GENERAL MECHANISM) A gel in classical colloidal terminology, is defined as a system which owes its characteristic properties to a cross linked network of polymeric chains which form at the gel point. a considerable amount of research has been carried out in recent years to elucidate the nature of the crosslinks and determine the structure of alginate gels. alginate beads can be prepared by extruding a solution of sodium alginate containing the desired drug or protein, as droplets, into a divalent crosslinking solution such as Ca2+, Ba2+, and Sr2+ . monovalent cations do not induce gelation while Ba2+, and Sr2+ ions produce stronger alginate gels than Ca2+. other divalent cations such as Pb2+, Cu2+, Cd2+, CO2+, Ni2+, Zn2+, Mn2+ will also cross link alginate gels but their use is limited due to their toxicity. The gelation and cross linking of the polymers are mainly achieved by the exchange of divalent cations and stacking of these guluronic acids with the divalent cations, and the stacking of these gul uronic groups to form the characteristic egg-box structure shown in fig LARGE BEAD PREPARATION In general, beads greater than 1. 0mm in diameter which can be produced by using a syringe, with a needle or a pipette. sodium alginate solution that contains the solubilised drug or protein is transferred dropwise into a gently agitated divalent cross linking solution. The diameter of the beads formed is dependant on the size of the needle used and the viscosity of the alginate solution . a larger diameter needle and higher viscosity solutions will produce larger diameter beads. The viscosity of SA can also influence the shape of the microbeads produced. The beads become more spherical as the concentration of SA increased. however, in general SA solutions of greater than 5% are difficult to prepare. Since, gelation occurs in an aqueous environment, alginate is a promising material as a food additive, drug formulation and useful even for encapsulation of living cells to protect them from immune responses. utilizing this stable complex formation with divalent cations, alginate gels have been utilized for investigation of cells are considered to be the ultimate system for the pulsatile release of biologically active compounds. Formulation of delivery devices for protein and peptide drugs under aqueous conditions are desirable to avoid the undesirable decrease of bioactivities which may occur when using organic solvents or heat during formulations. since relatively stable alginate gels can be formed in aqueous environments through chelation or complexation, which are promising delivery of matrices for bioactive compounds. It has been suggested that the crosslinks were caused either by ionic bridging of 2 carboxyl groups on adjacent polymer chains via calcium ions or by chelation of single calcium ions by hydroxyl and carboxyl groups on each of a pair of polymer chains. although these bonds may play a role in the gelation mechanism which are not sufficiently energetically favourable to account for the gelation of alginate. it has been shown on thebasis of fibre diffraction data and model-building calculations that the shape of both poly-mannuronic acid segments and the polygulutended, and that these extended ribbons can stack together in sheets. on the basis of these data and the properties of gels it has been suggested that the cooperative association of either polymannuronic acid segments or polyguluronic acid segments are involved in the formation of the crosslinked network of polymer chain. This technique has shown attractive applications in different fields, including cell immobilisation, owing to its mild operating conditions. as the encapsulation method is mild, and done at room temperature in aqueous medium, several sensitive drugs, proteins, living cells, enzymes, spermatozoa etc have been successfully encapsulated through alginate beads. The primary structure of alginate depends on the producing species and for the marine species, seasonal and geographical changes might result in variations in alginates extracted from the same species. The polymer is nown to form a physical gel by hydrogen bonding at low pH(acid gel)and by ionic interactions with polyvalent cations such as calcium, the cation acting as a cross linker between the polymer chains. The viscosity and primary structure of polymer are important features determining it swelling and gelling properties. At neutral pH, sodium alginate is soluble and hydrates to form viscous solutions, but below pH3, alginic acid, water swellable but insoluble, which is rapidly formed. since the hydration characteristics of the polymer and the subsequent physical properties of the hydrated gel layer may critically influence drug release. When CA beads are treated with 0. 1M HCl, alginate gels hydrolysed to lower molecular weight fractions of alginic acid. due to conversion of COO- groups into unionised carboxylic groups, the electrostatic attraction between Ca2+ ions and COO- ions in the egg-box junction almost disappears. moreover, there may occur in ion-exchange between H+ ion(presence in the external HCl solution) and free Ca2+ ions inside the beads. thus a reduced Ca2+ ions concentration within the beads results in a weaker Ca2+ cross linked beads when put in phosphate buffer at pH 6. 8. Therefore, the acid-treated beads are loosely crosslinked structure more soluble alginate as constituent. when such beads are put in the phosphate buffer pH6. 8, the beads swell at a faster rate but do not attain a higher water uptake value due to loosely bound structure of the beads which is unable to retain large amount of water within the beads. moreover, there is possibility of ion-exchange between H+ ions produced due to ion isation of carboxylic groups in the buffer at pH. A group of scientists developed a method of enclosing viable cells, tissues, and other labile biological substances within a semipermeable membrane. preliminary in-vitro studies of several types of microencapsulated cells and tissues(redblood cells, sperm cells, hepatica cells, hepatocytes, pancreatic endocrine tissues, and islets) were described by them. essentially, the process involves suspending the living cells or tissues in sodium alginate solution. The cell or tissue suspension is extruded through a device producing micro-droplets which fall into a calcium chloride solution and form gelled microbeads with the cells or tissues entrapped. These cell containing gel microbeads are next treated with polysine which displaces the surface layer of calcium ions and forms a permanent polysalt shell or membrane. finally, the interior calcium alginate is liquefied, either to stay in or to cum out(depending on molecular weight and size of the starting alginate) of the capsule with a calciu m sequestrant such as buffered citrate solution. Gohel et al ., prepared diclofenac sodium microspeheres by using sodium alginate as a polymer and CaCl2 as a cross linking agent. in this investigation stirring speed, concentration of crosslinking agent and heavy liquid paraffin were studied, on the time required for 80% of drug dissolution. a statistical model with significant interaction terms was derived to predict t80 and drug was released by diffusion of anomalous type. The results of multiple regression analysis and F value statistics revealed that, obtaining of controlled drug release and microspheres were to be prepared using relatively lower stirring speed. Literature reports indicate wide spread use of sodium alginate for achieving sustained release of drugs, targeting gastric mucosa and increasing the bioavailability of drugs because of sodium alginates ability to form a stable and bioadhesive gel with calcium ions. Alginate also has several unique properties that have enabled it to be used as a matrix for the entrapment or delivery of a variety of proteins, macromolecules and cells. USES Of Alginate Beads A relatively inert aqueous environment within the matrix. A mild room temperature encapsulation process free of organic solvent A high gel porosity which allows for high diffusion rate of macromolecules The ability to control this porosity with simple coating procedures. Dissolution and biodegradation of the system under normal physiological conditions. Standard graph for propranolol hydrochloride A stock solution of propranolol hydrochloride was prepared by dissolving 100mg of the drug in 100ml of the phosphate buffer of pH6. 8 to give 1mg/ml solution. ten millilitres of stock solution was diluted to 100ml using phosphate buffer f pH6. 8 to produce 100ÂÂ µg/ml working stock solution. from this working solution, dilutions were made with phosphate buffer of pH6. 8 to produce 10, 20, 30, 40 and 50 ÂÂ µg/ml. The ÃŽÂ » max of the drug was determined by scanning the dilutions between 400 and 200nm using a Shimadzu 1400 UV visible spectrophotometer. At this wavelength, the absorbances of all the other solutions were measured against a blank. Standard curve between concentration and absorbance was plotted. COMPATIBILITY STUDIES One of the requirements for the selection of suitable polymers or carriers for pharmaceutical formulation is its compatibility. Therefore in the present work a compatibility study was done by using Infra Red spectroscopy (IR) and Differential Scanning Calorimetry (DSC) to find out if there is any possible chemical interaction between propranolol hydrochloride and the polymers. DIFFERENTIAL SCANNING CALORIMETRY (DSC) Differential Scanning calorimetric analysis was used to characterize the thermal behaviour of the drug substances. It was performed by using DSC-60(Shimadzu, Tokyo, Japan) calorimeter to study the thermal behaviour of selected formulations. The instrument comprised of calorimeter (DSC60), flow controller (FCL60), thermal analyzer (TA60) and operating software(TA 60). The samples were heated in hermetically sealed aluminium pans under nitrogen flow (30ml/min)at a scanning rate of 5Â °C/min from 24 + 1Â °C to 300Â °C. An empty aluminium pan, sealed in the same way as the sample was used as a reference. SCANNING ELECTRON MICROSCOPY Scanning electron microscopy is used to obtain the surface topographical characterization of beads. SEM photographs of prepared formulations were taken with (Instrument JSM-6390)at different magnification ranging from 30 to 5000x at room temperature. The samples were mounted on double sided adhesive tape that has previously been secured on copper stubs. The acceleratio

Free Grapes of Wrath Essays: Religion in The Grapes of Wrath :: Grapes Wrath essays

Religion in The Grapes of Wrath  Ã‚      In The Grapes of Wrath the author, John Steinbeck, presents religion in several ways including the fanaticism of the Sin Watchers, Jim Casy’s parallel character to Jesus Christ, and through the use of symbolism throughout the novel.   Through these methods, Steinbeck weaves a web in which religion is presented as a double-edged blade; one can go to the path of being truly a devout, kind person, or one can choose the path of zealously, condemning all who would oppose or go against their views.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   The Sin Watchers represent the epitome of religious zeal.   They force their ideals upon others, and they point out the sinful ways of their fellow camp-mates.   These people Steinbeck presents as evil aberrations who disrupt the otherwise peaceful life at the government camp.   The most viewed Sin Watcher was the woman who berated Rose Of Sharon for her â€Å"sinful† ways.   This horrid woman told Rose Of Sharon that because of the hug-dancing and other fun activities, the baby would be stillborn.   Sadly, the baby was born dead, but not necessarily due to Rose Of Sharon’s activities.   This woman instilled in Rose Of Sharon the idea that it was her fault that the baby did not survive.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Jim Casy’s actions bore a close resemblance to the actions of Jesus Christ.   In the time the book was published, this was viewed as an act of blasphemy.   As discussed in class, many of the acts, trials, and tribulations of Jim Casy (along with the ominous JC initials) parallel those of Jesus.   Jim Casy represents the epitome of personal reverence, despite his renunciation of preaching.     Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Throughout The Grapes of Wrath, religious symbols crop up, further explaining the significance of the section.   One use of symbolism is that when on the road to California, Tom encounters a snake.   Already established in the novel is the fact that to the Goads, California represents a place of great wealth, freedom, and prosperity.   It is a Garden of Eden, so to speak.   The Garden of Eden had a serpent who brought the Wrath of God upon Adam and Eve.   The serpent supplied them with the forbidden fruit.   California is forbidden to outsiders and migrants.

Criticism Against the Modern Medicalization

Today the world in which we live in has faced steady medicalization of daily existence. Critics argue whether this leads to a favorable or a non favorable outcome. The establishment and development in medicine has become a major threat to health. Dependence on efficient health care affects all social relations. In rich countries medical colonization has reached sickening proportions whereas poor countries are quickly following suit. Medicalization, that â€Å"is the process by which human conditions and problems come to be defined and treated as medical conditions and problems, and thus come under the authority of doctors and other health professionals to study, diagnose, prevent or treat. † (wikipedia. org). In the modern world people feel dependant towards medical treatment no matter how minor it is. Whether the doctor is effective or not, it is an illusion what seems to be there in peoples’ hearts that they actually are being cured. Useless medical treatments, doctor-inflicted injuries, leave the patients helpless and as they are already defenceless and still consider themselves to be dependent on doctors. Modern Health care system has grown beyond limits in an unfavorable way. This can be said to happen due to 3 reasons. It must produce clinical damages which outweigh its potential benefits; it cannot but dim the political conditions which execute the society unhealthy; and it tends to assume the power of the individual to heal himself and to shape his or her environment. When it comes to producing medicine, Industrial progress is more being put into concern rather than personal growth. Such medicine is but a device to convince those who are sick and tired of society that it is they who are ill, incompetent and in need of technical repair. Most people are already doubtful about medicine and only need evidence to affirm their uncertainty. Doctors already find it necessary to boost their credibility by demanding that many treatments now common be officially prohibited. Medical performances which are considered as necessary are often so basic that restrictions are put on to them and are not acceptable to many politicians. Medications are costly and contain a high risk, which sometimes makes them not worth to be used. The world that we live in has experienced dramatic changes in the diseases afflicting population. Facts have proved that now a day’s early deaths are caused due to different diseases rather than accidents, violence, or suicide. During the past century deaths have been mainly due to different diseases for example malaria, typhoid, tuberculosis, measles, whooping cough, diphtheria, scarlet fever and many more. But the death rate has been fairly decreased due to the introduction of antibiotics and widespread immunization. Improved housing and better nutrition are also one of the factors that have caused the death rate to fall and keep people away from various deadly diseases. Past century has also experienced major malnutrition syndromes, such as rickets and pellagra. But these have been soon replaced by modern epidemics such as coronary heart disease, emphysema, bronchitis and obesity, hypertension, cancer, arthritis, diabetes, and the so called mental disorders. In a way, the elimination of old forms of mortality has increased life expectancy which now suffers from the new diseases. The trend experienced of the diseases afflicting the population shows that the environment is the primary determinant of the state of general health of the society. The food we eat, the houses we live in, the working conditions, neighbourhood coherence, as well as the cultural mechanisms, which make it possible to keep us stable, and play a major role in deciding how healthy we feel and at what age we tend to die. The life expectancy is no doubt increased due to more healthy way of living, but more and more diseases that are affecting people is not due to the number of doctors available, or the medical treatment. The new techniques available to recognize and treat unhealthy conditions by surgical interventions redefine but do not reduce despair. It is not surprising to see that where certain diseases have become rare, the number of doctors exceeds the need of people as compared to the places where those diseases are more to be found. Doctors tend to work in places where the climate is healthy, where the water is clean, and where people work and can pay for their services. Useless medical treatments also take place in cases where they are not necessarily needed. During the last century there have been many, but limited number of medical procedures that have indeed become effective and beneficial for the people. Those medical treatments which are designed for widespread diseases are comparatively cheaper than the ones used for unique or diseases that do not exist on a high scale. The cheap medical treatments are only in the case where they are monopolized for personal use, and they require a minimum of personal skills, materials or hotel services from hospitals. Many dangerous diseases such as malaria, paralytic poliomyelitis, whooping cough, and measles, medicines to cure these diseases have shown considerable progress. But for most other infections, medicine can show no comparable results. For many diseases medicine has a short term effect but for the long term, it tends to be unsuitable or ineffective. Heart diseases, different types of cancers are highly curable, but there are some stages of these diseases at which the diseases gets hard or impossible to be cured. Breast cancer for example is curable but in some cases it is impossible to be cured no matter how frequently medical checkups are being performed. Surgery and chemotherapy for rare congenital and rheumatic heart disease has increased the chances for an active life for some of those who suffer from these conditions. The drug treatment of high blood pressure is effective for the few in whom it is a diseased condition and can do a serious harm to those in whom it is not. But no matters how careful we are or how frequent checkups are being down, doctor inflicted injuries are also getting very common. People suffer from illness that is caused by professional medical treatments. This doctor-made disease is also known as Iatrogenesis. Medicines are widely used for the smallest of diseases. But their unwanted side effects have increased with their effectiveness and widespread use. Several people now a day’s swallow medically prescribed chemical. Some take a wrong drug, others get a contaminated or old batch, others take several drugs which are dangerous or take them in dangerous combinations, and others receive injections with improperly sterilized syringes or brittle needles. Many drugs are also addictive or mutilating, or also mutagenic. Other drugs contribute to the breeding of drug-resistant strains of bacteria. Unnecessary surgeries are normally performed these days. Diseases that are not to happen, a person gets effected because of over medical treatment. The side effects of medications are more than the benefits gained from them. Malpractice, which is known as carelessness is neglected and is not given much of an importance even though it is something to be put into concern. While performing medical surgeries on which lives are dependant, sometimes malpractice even causes a loss in human life. Doctors are being transformed into technicians applying scientific rules to classes of patients. What had formally been considered an abuse of confidence and a moral fault can now be rationalized into the occasional breakdown of the equipment and operators. Malpractice is considered a technical problem not an ethical problem anymore. Undesirable side effects or mistaken or unintentional use of medication has left many patients as helpless and defenceless. Damages are done to the patients due to the doctors carelessness or exploitation and also in the case when the doctor attempts to protect himself against the patients eventual legal action of malpractice. Many people who are inflicted with specific diseases are not allowed to work leaving them helpless and are unable to live their life to the most and earn themselves a good living. Many people start living their lives in a way they think is health wise better and beneficial for them, but at a later stage it turns out to be as harmful and makes them fall into illness. Modern medicalization has faced critics and in a way they prove to be right and unethical for the society. Medical nemesis can only be reversed through mutual self care, if not than the world will be bound to suffer from this dilemma that prevails.

Assessing different approaches to customer service

For my Customer Service Unit I will be interviewing two leisure centres, College of St. Mark and St. John and the Mayflower leisure Centre. I have chosen these two centres because they are slightly different and I thought it would be interesting to see how different companies have different customer service. The College of St. Mark and St. John is in Derriford, Plymouth. It covers a very large area and its facilities include a 25 metre indoor heated swimming pool, a fitness suite, two squash courts, a fully equipped gymnasium, three sports halls, each with four badminton courts and a specialist built-in rock-climbing wall, computing facilities, and an outdoor pursuits centre. In addition to extensive playing fields, there is a full size all-weather floodlit pitch for top level hockey and football. A smaller all-weather surface accommodates tennis and provides a good training surface all year round. In addition to this there is a 36m. square sports hall for participation in a variety of sports which is also large enough to accommodate Trade Fairs and other large events; a gymnasium for martial arts, aerobics, ‘step' and tone & trim classes; a standard size sports hall available for volleyball, basketball, badminton; 2 squash courts and a Fitness Suite with up to date cardiovascular and weight training equipment. Although this sports centre is within the college, it is open to any member of the public, not just the students at the college. The Mayflower Leisure Centre is situated in Central Park, Plymouth. It is quite old and may need to be revamped within the next few years. It's facilities include a fitness suite which has treadmills, cross trainers, climbers, bikes, rowers and resistance machines and it also has squash courts, indoor bowls and sun beds. There are two sports halls, one is a 5-a-side football hall and the other is a multi purpose sports hall, which can house badminton, volleyball, basketball, short tennis and dry board diving. The College of St. Mark and St. John is a sports college therefore it has numerous amounts of sports facilities. The college is a Church of England voluntary college, with a history of over 150 years and it moved from London to Plymouth in 1973. The Mayflower Leisure Centre is quite old, as I mentioned previously but is the most well used public sector leisure facility in the area. It works in close partnership with the Central Park Swimming Pool which is it's neighbouring building. To find out the information I want, I am going to visit each venue for an interview. For letter, see Appendix 1. I am going to ask them several questions on different topics to find out as much as I can about the Customer Service in their establishment. For questions, see Appendix 2. I will then analyse the answers of the questions and compare the two companies to see who has the best customer service.