Dress Code in School Research Paper Example | Topics and Well Written Essays - 1000 words

Dress Code in School - Research Paper Example in Kraft, 2003). Are you a liberal? Are you a conservative? Whatever be your political leaning, or personal belief, I am sure every one of you will agree with me that school safety is of paramount importance to society. The provision of a safe study environment takes precedence over self-expression. In these days of unequivocal liberalism, when the least hint of curtailment of individual rights is immediately condemned as authoritarianism, I defiantly stand here before you in support of a uniform dress code in schools. I am aware that many of you will equate a uniform dress code with the stifling of creativity and the freedom to self-expression. But this is a very simplistic way of looking at the issue. The school is the primary and most crucial factor in the educational process of an individual. It is here that the moral foundation and intellectual capabilities of the child are built up. Schools must be differentiated from society at large, and special rules applied here. In this co ntext, it is crucial that the school environment is totally focused on learning, and all extraneous factors are eliminated. ... This factor is of great significance in keeping students under secure supervision. Conversely, uniforms make is easy to identify any trespassers on school property. This is a very effective safeguard against the entry of anti-social elements into the school campus and the disruption of discipline. School uniforms eliminate the possibility of ignorant students inadvertently wearing gang colors, or other gang related items of clothing, and being exposed to attacks by opposite gangs as a result of this. The use of gang attire is completely eliminated on campus. The uniform does away with badges of gang identity, such as aggressively painted jackets, bandannas, or chunky jewelry. Expensive and fashionable clothes are often the cause of inciting less privileged children to resort to theft and violence. In the same way, emphasis on fashionable dressing may lead to competition among students and result in violence. School uniforms as unequivocally â€Å"competition reducing† (Kraft, 2003). In some cases, fashion accessories and clothes are used as weapons or as a means to conceal weapons. (Paliokas, n.d.). The use of hooded sweatshirts, as a deliberate way to avoid detection after acts of vandalism in school, is a pointer in this direction. It is clear that school safety justifies the implementation of a uniform dress code. Self-esteem is a major issue for all school-going children. American school reports show that â€Å"students base the worth of peers on the kinds of clothes that are worn but distinctions in worth were not noted when the entire school population was dressed in uniforms† (King, 2002. qtd. in Kraft, 2003). The major link between self-esteem and clothes is the fact that clothes emphatically proclaim income disparities, and become the basis

Veteran's Affair Services Research Paper Example | Topics and Well Written Essays - 2000 words

Veteran's Affair Services - Research Paper Example Veteran’s Affair Services When one hears the term ‘veteran’, a perception of its meaning encompasses regular definitions found in the dictionaries, to wit: â€Å"a person who is long experienced or practiced in an activity or capacity† (The Free Dictionary, 2011, par. 1); â€Å"an old soldier of long service or a former member of the armed forces† (Merriam-Webster, 2011, par. 1). In contrast, the Federal definition the term is explicitly stated as â€Å"any person, who served honorably on active duty in the armed forces of the United States† (Veterans’ Agent, 2011, par. 1). These definitions confer that a veteran is a person who has rendered particularly long service, as honorably classified, in the armed forces, not only in the United States, but in other governments as well. ... In this regard, the main purpose of the research is to proffer a study of how Veteran's services affects criminal justice in the United States. Particularly, the objectives of the research are as follows: (1) to present a detailed history of the creation of Veteran’s Affair; (2) to provide a presentation of the mission statement of the social agency; (3) to present financial reports or summaries of the operations of the social agency; (4) to proffer a critical analysis of the effectiveness of the social agency, which includes, but is not limited to: details on how the specific agency interacts with the Criminal Justice System, the services provided, the training of critical personnel, and the motivation of the agency to provide services; (5) to present a commentary on ways in which the social agency could improve its effectiveness towards its social goals; and finally, (6) to provide a prediction concerning the future of the social agency and its impact on the criminal justice system. Historical Background The history of Veterans Affairs (VA) in the US was traced in the year 1636 when a war existed between the Pilgrims of Plymouth Colony were at war with the Pequot Indians and a law was enacted by the Pilgrims indicating the support pledged to disabled soldiers (US Dept. of Veterans Affairs: History, 2010, par. 1). The following historical details are presented in tabular form for concise structural arrangement, and sourced from the Dept of VA: History (2010): DATE SIGNIFICANT EVENTS 1776 During the Revolutionary War, Continental Congress encouraged enlistment of soldiers through the provision of pensions to disabled soldiers. 1811 The Federal Government authorized the first domiciliary

Imperfections of modern society Essay Example for Free

Imperfections of modern society Essay Fashion may be described as the predominant style at any given time due to ones mode of expression or presentation. Ones personality may be defined by the clothes they have selected to wear. Celebrities and fashion ads seem to demonstrate that it is acceptable to wear extremely revealing clothes and promote their outfits. Sexually provocative people with strong personalities may choose to wear clothes with inappropriate innuendos or phrases written on them. Modern fashion illustrates the social acceptance of provocative clothing, which reflects upon our cultures bold behavior. see more:why fashion is important It is thought that the clothes society chooses to wear defines ones intentions, character and gives others a basis on how to interpret personality. People have bold behaviours because of what they wear. Many are too open with what they wear making it seem as if modern fashion is mainly about sex appeal. Modern culture is mainly concerned with how others will interpret them and their appearance. Therefore society uses this to make oneself more appealing. If someone were to dress in revealing clothing, others will construe this as they are trying make themselves as sexually appealing as possible. However if someone were to dress in less revealing clothes they would not be in to the hype of sex appeal. This shows how modern culture reflects on the clothes being worn. These people who are only worried about revealing themselves through outfits clearly have bold behaviours because they care what society thinks of them. People tend to act more outgoing when they are dress in clothes that they are comfortable wearing. No matter what type of clothing a person wears it can be an influence that alters others perception of the character of a person. Revealing clothing that is exposed by media can be dangerous to people’s thoughts on modern fashion. Celebrities feel that it acceptable to wear whatever they please. Miley Cyrus is an excellent example of this. She has recently had a tendency of wearing inappropriate clothing on stage and in her music videos. Her personality reflects how she dresses by showing how much she does not care about what people think of her. Miley is very revealing in her videos and her lyrics show her personality of being so careless of what other people think. â€Å"Its our party we can do what we want to†¦ Its my mouth I can say what I want to†(Cyrus). In her lyrics, she is inferring that she is above the law. This is the unstated conclusion throughout her song. She shows her careless attitude in her lyrics but also in her music videos. Miley is a role model to many but she rolls around on the floor wearing nothing but underwear and a tank top making it seem like this is acceptable as she has a young, naive audience that does not know between right and wrong. She also does dance moves that are so inappropriate that young children should not watch this. Miley used to dress normally and she was an idol for many young girls growing up starring as Hannah Montana. Now she has changed personality by exemplifying it through her fashion. Clothing with sexual or inappropriate phrases written on them has become more popular in modern culture because of the popular idols. People with forward personalities tend to buy clothes that reflect on the way that one would want to be judged. Select societies with careless attitudes wear clothing that can be offensive to other people. Shirts with phrases such as â€Å"Orgasm Donor† and â€Å"Drink Up Bitches† are some of many examples of the offensiveness that people display through their clothing. People who wear clothing like this are often sexually provocative people who try to resemble the looks of their idols. Society feels the need encourage to others that it is socially acceptable to look sexually appealing. In reality this type of clothing is obnoxious and reflects poorly on modern culture by giving it a bad label. The popularity of wearing offensive clothing has increased due to people trying to â€Å"fit in†. People who are unsure of what type of personality they have are often the ones who go with the latest and most popular fashion. Our cultures outgoing behaviour is based on the social acceptance that modern fashion portrays. It is believed that the clothes that a person may wear can reflect on their personality. Celebrities who wear excessively revealing clothing tend to set an image that modern culture wants to follow. Miley Cyrus is one of the many celebrities who contribute to this. People who have audacious personalities are usually ones to try to keep up with modern fashion. These people have clothing with sexually provocative expressions written on them. Fashion can be defined as the prevailing style or etiquette. Society may dress to support feelings, actions or how others should interpret their character. Works Cited Cyrus, Miley. MILEY CYRUS WE CANT STOP LYRICS. Directlyrics. N. p. , n. d. Web. 26 Sept. 2013.

Development of Sediment Reference Sample for Toxicity Tests

Development of Sediment Reference Sample for Toxicity Tests Development of sediment reference sample for toxicity testing using Microtox Solid Phase test and Metal Fractionation using single extractions Abstract Chemical characterisation of pollutants using fractionation techniques and bioassays are useful monitoring tools for sediment quality assessment. However, a common criticism of sediment bioassays is the lack of an appropriate reference sediment sample which sample sediment toxicity can be comparatively assessed. In this study an approach of obtaining a reference sediment sample by cleaning the sediment samples with metals was tested. Metal fractionation was carried out by applying single extraction techniques modified from a sequential extraction scheme proposed by Tessier et al (1979). The total metal concentrations were characterised using nitric acid digestion. The sediment samples before and after the extractions were analysed using the Microtox Solid Phase Test (SPT). Comparison of total metal concentration with various sediment quality guidelines suggests that the sediments are polluted due to higher concentrations of Cu , Ni , Pb , Cd and Zn. The fractionation studies reveal t hat metals are contained mainly within Fe-Mn Oxide phase.The comparison of the results of the SPT with various sediment classification methods suggests that the sediments are moderately toxic to non toxic. However, the results of changes in the toxicity of sediment residues obtained after each extraction compared to unprocessed sediment toxicity results are not statistically significant. But the comparison of toxicity results of sediment residues obtained after HNO3 and NaOAc digestion with the toxicity value of replicate1 of unprocessed sediment suggests a marginal decrease in the toxicity of sediments while the comparison of toxicity values of MgCl2 , NH2OH.HCl, HNO3+H2O2 indicates an increase in the toxicity of sediment residued. The comparison of toxicity values of all sediment residues with that of replicate2 of unprocessed sediment indicates an increase in the toxicity of the sediments after extractions. Get wisdom, get understanding. Wisdom is supreme; therefore get wisdom. Though it costs all you have, get understanding (Proverbs 4: 5,7). Then you will know the truth, and the truth will set you free (John 8: 32). CHAPTER 1 INTRODUCTION Background: With the growing interest in the rules that govern the fate of pollutants in urban environments, the sediments of urban rivers pose a particularly challenging scientific problem as many persistent contaminants (e.g. metals, persistent organic pollutants (POPs)) tend to concentrate in river bed sediments. Therefore, the assessment of sediment quality is recognised as a critical step in understanding the risks associated with man made pollution in the riverine system (De Miguel et al , 2005). Depending upon the conditions in the river, pollutants bound to sediment may become bioavailable and impose toxicity on aquatic organisms. Chemical analysis alone is not adequate to explain effects of chemicals present in the sediment (Beg and Ali, 2008) as they do not prove that adverse effects are occurring (Luoma et al , 1995) , thus for optimal characterization and assessment of pollution , issues concerning both concentration and toxicity should be addressed (Mowat et al , 2001). Therefore, because of the need to establish a cause -effect relationship between the concentration of pollutants and consequent environmental damage and to measure the possible synergistic effect of complex mixture of chemicals(Girotti et al , 2008), Microbial toxicity tests based on bacteria have been widely used in environmental toxicity screening due to the similarity of complex biochemical function in bacteria and higher organisms (Mowat et al , 2001) .Among the bioassays solid phase tests are useful and widely used as test organisms are exposed to whole sediments which include water soluble and non polar substances and thus offer a high relative realism for toxicity assessment of sediments. However, sediment toxicity tests require reference sediment exclusive of contaminant with similar physico chemical characteristics as the test sediments (Guzzella , 1998). The microtox test based on bacterial bioluminescence which uses V. Fischeri bacteria as test organism represent one of the most suitable test for sediment toxicity assessment as it can be used on extracts as well as directly to the sediment (solid phase test) ( Calace et al , 2005). As it is now widely recognised that the total concentrations of Heavy Metals indicate the extent of contamination, but they provide little information about the forms in which Heavy Metals are present, or about their potential for mobility and bioavailability in the environment (Lake et al , 1987) , knowledge on metal speciation in the sedimentary environment may be of more importance for hazard assessment than the total metal concentrations( Farkas et al , 2007). For this reason, sequential extraction procedures are commonly applied because they provide information about the fractionation of metals in the different lattices of the sediments and other solid samples (Margui et al , 2004). It is against this background that an investigation into establishing a reference sediment sample for solid phase bioassays was undertaken in relation to Microtox solid phase test utilising single extractions of metal fractions using -same conditions and procedures described in the sequential extraction procedure mentioned in Tessier et al 1979 . Aims and Objectives: The main aim of the study is to assess whether the approach of cleaning the sediment with metals using single extraction steps of sequential extraction is an appropriate alternative to develop a sediment reference sample or not. In order to obtain a reference sample exclusive of metals, the following procedure was adopted: Each extraction step described in the Tessier scheme was applied to separate aliquots of sediment samples using the same extraction conditions and chemicals described in the scheme (see section 3.8 for details). After the extraction step washed and dried residue sediment samples were analysed for toxicity using the Microtox solid phase test. A reduction in the toxicity could be expected as the metals were removed using chemicals. Microtox solid phase test was also conducted on unprocessed sediment so that a relative comparison between toxicity measurements could be made. The objectives of the investigation are summarised as follows : To characterise the sediments for total bio available metal concentration for eight heavy metals (Cd, Cr, Cu,Fe,Mn,Zn,Pb,Ni) using nitric acid digestion method. To characterise various fractions of metals as described in the Tessier Scheme using single extraction procedures. To determine the level of toxicity associated with unprocessed and processed sediment sample using the Microtox solid phase test. CHAPTER 2 LITERATURE REVIEW 2.1 Urban River Sediments and Pollution: Urban rivers have been linked with water quality issues since the nineteenth century when it was usual practice to discharge untreated domestic and industrial waste into water courses. Since then the situation has been improved due to e.g. the management curtailment of pollution at sewage treatment plants. However, because of high population densities in urban areas due to variety of sources of pollution the degradation of urban rivers is still important today (Goodwin et al , 2003). When released into the river environment many anthropogenic chemicals bind or adsorb on to particulate matter and depending upon river morphology and hydrological conditions such particulate matter along with associated contaminants can settle out along the water course and become part of the bottom sediments(Vigano et al , 2003). Thus , sediments are considered as repositories for physical and biological debris and for many pollutants (Calmano et al , 1996). Further more , under various physical , biological and chemical conditions (e.g. aqueous solubility ,pH, redox , affinity for sediment organic carbon , grain size of sediments , sediment mineral constituents and quantity of acid volatile sulfides) these contaminants may become bioavailable and result in a toxic impact on aquatic biota(Ingersoll et al , 1995). Nowdays, escalating evidence of environmental degradation have been confirmed where water quality guidelines for contaminants are not surpassed but, still organisms in or near the sediments are adversely affected (Ingersoll et al , 1995). Thus, with a vision to protecting aquatic biota, improving water quality and managing problems of resuspension and the land deposition of dredged materials, sediment quality assessment has been a crucial scientific and legislative issue in recent years. ( Calmano et al 1996 ; Nipper et al 1998). 2.2 Water Framework Directive (WFD) : The European Unions(EU) Water Framework Directive (WFD) which came in effect on 22 December 2000, is one of the most important pieces of environmental legislation and is likely to transform the way water quality is being monitored within all member states ( Allan et al , 2006). The main objective of the Directive is to improve, protect and prevent further deterioration of water quality across Europe and it aims to achieve and ensure good quality status of all water bodies throughout Europe by 2015. Thus the necessity of addressing water quality issues associated with urban rivers has been increased within Member States(Goodwin et a, 2003). Under the WFD , three modes of monitoring strategies are specified and at each strategy level chemical monitoring , biological/ecological assessment , physico-chemical and hydro morphological tools have been covered to assess the water quality status of the body(Allan et al,2006). In the WFD, EU commission places emphasis on establishing quality standards related to the concentrations of priority substances and substances which may cause harm in water , sediment or biota . (Crane , 2003). 2.3 Sediment and Pollutants Sources in Urban Rivers : Urban river system is much more complex in its sediments and pollutant sources. Sediments may be released into urban rivers due to erosion of land surface through variety of physical and chemical processes, the rapid run off from impervious surfaces, routing through drainage network, retention tanks and winter gritting roads (Goodwin et al, 2003). These sediments may contain or associated with pollutants such as hydrocarbons , garden and animal wastes , fertilisers , pesticides , oils , detergents , deicing chemicals , street litter (Hall, 1984 ; Chapman, 1996) and trace and heavy metals (Collins et al, 2007). Moreover, Combined Sewer Overflow (CSO) events also augment the pollutant and sediment load due to its own contaminant load and the erosion and wash out of in-sewer sediments (Fierros et al , 2002). Due to the wide variety of sources and river dynamics there exist a wide spatial and temporal variation in the properties of sediments. 2.4 River Sediment Composition and dynamics : River sediments are mainly composed of mineral particles originated from the parent rocks due to erosion process, particulate organic matter adsorbed on mineral particles or particle sized organic matter which originates from plant detritus and animal debris, adsorbed nutrients and toxic inorganic and organic pollutants (Chapman , 1996). However , with respect to their behaviour in nature , sediments can be classified in two distinctively different groups a) fine sediments with particles smaller than 50m (i.e silt and clay) and b) coarse sediments with size exceeding 50m ( i.e. sands and gravels) (Salomons et al , 1984). The erosion, transportation and deposition of sediment is a function of river flow velocity, particle size, water content of the material (Chapman , 1996) , channel structure and degree of turbulence(Goodwin et al , 2003). Under certain hydraulic conditions sediments can be transported in suspension or by traction along the bottom which is often called Bed Load. The suspension mechanism initiates the movement of fine particles while the Bed Load causes the movement of coarse particles (Chapman , 1996). More over, within urban catchments rapid runoff and CSO events trigger river flow events with short peak times and high peak flows which step up transport of sediments and associated pollutants (Goodwin et al , 2003). 2.5 Sediment Quality Assessment: Historically, the assessment of sediment quality has often been limited to chemical characterisation. It helps to classify what are the contaminants and what is their concentrations(McCauley et al , 2000) and it provides information about the condition of sediments and processes within them(Wolska et al , 2007). However, quantifying contaminant concentration alone can not provide enough information to evaluate adequately potential adverse effects, possible interaction among chemicals or the time dependent availability of these materials to aquatic organisms ( Ingersoll et al , 1995) because it is impractical to analyze all the compounds and their synergistic/antagonistic effects contributing to toxicity(Plaza et al , 2005). As the bioavailability of pollutants to aquatic biota and their effects on the biota is the key concern in sediment risk assessment , ecotoxicological testing (bioassays) of sediments which study the toxic effects of sediment contaminants on living organisms ( e.g . fish , plants , bacteria , algae) has been extensively used ( Rand et al , 1995). Thus, to understand the fate of pollutants in sediments and their impacts on aquatic biota , a tiered biological and chemical assessment methods have been implemented (Calmano et al , 1996) . The sediment quality triad methodology, one of the most widely used tiered approach based on weight of evidence combines 1) Identification and quantification of contaminants (i.e. chemical analyses ) , 2) Measurement and quantification of Toxicity based on bioassays (toxicity tests) and 3) Evaluation of in situ biological effects(e.g. Benthic community structure) (Calmano et al , 1996 ; McCauley et al , 2000 ). Principal advantages are that it can be used for any sediment type (Calmano et al ,1996) and as both biological and chemical components are used , environmental significance of contaminated sediments is addressed (McCauley et al , 2000). However the cause -effect relations are not always identified due to the synergistic/antagonistic effects of chemicals causing toxicity in sediments (Calmano et al , 1996 ; McCauley et al , 2000) . Furthermore, the assessment is very site specific and does not allow empirical calculations of chemical specific guidelines ( Mc Cauley , 2000). 2.6 Metals in Urban Sediments and Sources : Metals are natural components of biosphere (Luoma , 1983) and they are introduced in to the aquatic environment through many lithogenic and anthropogenic sources(Zhou et al , 2008). Chemical leaching of bedrocks , water drainage basins and run off from banks are considered as the major lithogenic sources of metals (Zhou et al , 2008) while emissions from industrial processes ( e.g. mining , smelting , finishing , plating , paint an dye manufaturing) (Rand et al , 1995) and through urban sewage, house hold effluents, drainage water, business effluents , atmospheric deposition and traffic related emissions transported with storm water (Karvelas et al , 2003) are the major anthropogenic sources of metals in the aquatic environment. Upon discharge to the aquatic environment metals are partitioned between solid and liquid phase (Luoma , 1983) and eventually as a result of settling metals associated with solid phase accumulate in bottom sediments(Farkas et al , 2007).Thus , sediments are m ain sink of metals in aquatic environment(Morillo et al , 2002). A comparison of typical concentration of metals in urban river sediments is presented in the Table 2.1. Table 2.1 : Concentration of metals in urban river sediments(g/g) (reproduced from De Miguel et al , 2005) Cr Cu Fe(%) Mn Ni Pb Zn River Henares, Spain (97-180) (7-270) (0.8-3.16) (150-445) (11-128) (17-1280) River Seine , France 84 2.91 162 429 River Sowe , UK 47.9 164 411 786 Semarang , Indonesia (12.3-448) (5.2-2666) (53.7-1257) Danube River, Austria 43.5 53.9 187 Tiber river , Italy (18.2-54.2) (13.3-45.5) (3.6-33.5) (12.4-43.1) (53.4-417.6) River Po, Italy (118-223) (45.2-179.9) (4.5-5.2) (355-1159) (99-237) (39.3-71.8) (127-519) River Sherbourne 38 71 2.9 481 19 118 196 River Manzanares (18-1260 (11-347) (1.9-9.1) (305-1276) (5-47) (42-371) (70-591) In brackets : minimum- maximum values ; in italic :arithmatic mean values 2.7 Toxic metals and their forms in sediments : Although some metals are essential micronutrients (e.g. Mn, Fe, Cu,Zn) , almost all metals are toxic to aquatic organisms and human health if exposure levels are sufficiently high (Luoma , 1983). Among the toxic metals cadmium, chromium, copper, lead, nickel, zinc, mercury and arsenic are of prime importance due to their association with anthropogenic inputs. Under different physical, biological or chemical conditions the toxicity of metals in sediments is a matter of bio availability (Jennett et al ,1980). Thus in order to estimate the bio availability of metals and their potential toxicity it is desirable not only to determine the total concentration but also the different chemical forms or ways of binding between metals and sediments(Albores et al , 2000). In sediments depending upon various physical, chemical and biological conditions , metals partitioned into different chemical forms associated with a variety of organic and inorganic phases (Farkas et al , 2007).In river sediments metal can be bound to various compartments e.g. adsorbed onto clay surfaces or iron and manganese oxy hydroxides, present in lattice of secondary minerals such as carbonates, sulphates or oxides, occluded within amorphous material such as iron and manganese oxyhydroxides, complexed with organic matter or lattice of primary minerals such as silicates (Gismera et al , 2004). Due to natural and anthropogenic environmental changes these associations can be altered and metals can become more or less bio available or mobilized within different phases. These influential factors include pH, temperature , redox potential , organic matter decomposition , leaching and ion exchange processes and microbial activity(Filgueiras et al ,2002). Thus in relation to their mobi lity and bioavailability, in order of decreasing interest the major metal fractions are : 1) Exchangeable ,2) Bound to carbonates , 3) Bound to Fe-Mn Oxides , 4) Bound to organic matter and 5) Residual . 2.7.1 Exchangeable Metals : In this fraction , weakly adsorbed metals retained on the solid surface by relatively weak electrostatic forces that can be released by ion exchange processes in the sediment are included(Filgueiras et al , 2002). These metals are considered the most available form of metals present in the sediments (Morrison , 1985). 2.7.2 Metals Bound to Carbonates : Metals in this fractions are co-precipitated with carbonates which exist as cement and coating (Morrison , 1985) and this phase can be an important adsorbent for metals in the absence of organic matter and Fe-Mn oxides (Filgueiras et al , 2002). 2.7.3 Metals bound to Fe-Mn Oxides : Metals in this fraction are associated with Iron and Manganese oxides which exist as nodules , concretion and cement between particles or simply as a coating on particles. Iron and Manganese oxides are considered as excellent scavengers of metals and are thermodynamically unstable under anoxic conditions (Tessier et al , 1979). 2.7.4 Metals bound to organic matter : In this fractions metals associated with various forms of organic materials such as living organisms, plant and animal detritus or coatings on mineral particles are included. This fraction is considered to be less mobile due to their associations with humic substances of higher molecular weights(Filgueiras et al , 2002). 2.8 Sequential Extractions : A sequential extraction procedure (SEP) also known as sequential extraction scheme (SES) can be used to determine above mentioned binding fractions of metals in the sediment. In this process, given sediment sample is subjected to a series of increasingly strong , phase specific reagents under controlled condition which extract our metals from the particular physic-chemical phase of interest(Bird et al , 2005). Depending upon target fractions, a wide variety of chemical extractants can be used (see fig.2.1) and thus in the literature various sequential extraction schemes are available which differ in the use of extractant, target phase and the order of attack to separate particular form of metals. The majority of the schemes are variants of a scheme proposed by Tessier et al (1979). Many researchers have reported difficulties in comparing the results of SES due to their wide variation in the use of chemicals and target phase. Thus, in an effort to harmonize the different methodologies and to make the comparison of results easier , Community Bureau of Reference (BCR) proposed a three step extraction procedure along with a reference sediment material to certify the protocol (Mossop and Davidson , 2003). 2.9 Advantages and problems of sequential extractions : The application of sequential extraction techniques , though time consuming provide valuable information about the origin , mode of occurrence, biological and physic-chemical availability , mobilisation and transport of metals within the sedimentary matrices(Tokalioglu et al , 2000).However, since their initial development, sequential extraction schemes have been criticized for the lack of selectivity of reagents, issues of re adsorption and redistribution of metals solubilised during extraction and changes in speciation due to sample pre- treatment and its general methodology ( Gleyzes et al , 2002). In the sequential extraction scheme, the reagents are expected to attack only the target phase without solubilising the other phases. However, it has been found that the reagents are not selective and may affect other phases also. Thus the sequential extractions are termed as operationally defined fractionation techniques. This lack of selectivity may cause re-adsoprtion and re distribution of metals among the target phases. Moreover, incomplete dissolution of some phases and changes in pH may also lead toward re adsorption and redistribution problems (Gleyzes et al, 2002). Various researchers have reported the problem of re adsorption and redistribution for many sequential extractions for each phase. Despite these limitations sequential extractions are widely accepted for metal fractionation in sediment samples to assess the mobility and bioavailability of metals . 2.10 Single Extractions : To reduce lengthy procedures and thus making sequential extractions a part of routine analysis, various alternatives(e.g. microwave heating and ultrasonic shaking) to conventional extraction procedures have been employed (Albores et al , 2000). One of the alternatives to reduce the lengthy and laborious sequential process is to use single extractions. In single extractions the same reagents and operating conditions as the sequential extractions are applied to different sub- sample (Albores et al ,2000) and, except for first step , the metal concentrations in each individual step can be obtained by subtracting the results obtained in two successive steps(Filgueiras et al , 2002). Initially this technique was suggested by Tack et al (1996) in which first three steps mentioned in Tessiers Scheme were extracted simultaneously while, for organic matter bound metals, it was suggested that the sample should be extracted first for reducing metals and should then be re treated with hydrogen p eroxide step to remove organic matter and thus release metals bound to this phase. 2.11 Bioassays : A useful monitoring tool Bioassays measure changes in physiology and behaviour of living organisms resulting from stress induced by biological or chemical toxic compounds which can cause disruption of e.g. metabolism. Thus, bioassays help to establish cause / effect relationship between the concentrations of pollutants and consequent environmental damage (Girrotti et al , 2008). Historically fish and macro invertabrates bioassays are the first in the series of toxicity bioassays involving animals. As these bioassays were found useful in assessing the acute toxicity of chemicals and effluents and often predicted their effects of aquatic biota and habitat, they have been extensively used in the screening of chemicals and regulatory compliance monitoring (Blaise et al , 1998). However , these conventional bioassays require longer test duration along with additional time(e.g. acclimatisation) for preparations of the test (Ribo and Kaiser , 1987). Moreover toxicity was found a trophic level property and thus it was realized that protection of aquatic resources could not be ensured by conducting bioassays solely at macro organism level (Rand et al , 1995). Therefore an urgent requirement of cost effective , multi trophic and faster bioassays was strongly felt which led to development of micro scale testing procedures involving bacteria , protozoa , micro algae and micro invertabrate (Blaise et al , 1998). Distinct advantages of microbial testing procedures include :1) ease of handling ,2 ) short testing time , 2) reproducibility of results (Mowat et al , 2001) and 4) cost effectiveness (Wadhia and Thompson , 2007). 2.12 Sediment Toxicity Tests : As Van Beelen (2003) stated, toxicity is not a substance property only , but it is the c

Gay Rights Essay -- essays research papers

Gay Rights Two men are walking down the street very peacefully until they decide to kiss one another right out in the open. Some people look upon this as weird and others look upon it in disgust. Some even get angry about it. Is there a problem with what these men just did? Should they be left alone or reprimanded for what they have done? The issue of gay rights is very cloudy in our great nation. Most of this is due to the problems with the issue, the reasons for controversy, and pros and cons of the issue. First of all, both sides have too many problems with gay rights for there to be a common ground on the issue. The biggest problem I find with the whole thing is the problem is not just fought by words, but also by physical means. There have been countless gay beatings across the United States. One instance took place on November 17, 2001. â€Å"Police said the 42-year-old Vancouver man, whose injuries indicate he was beaten several times with a baseball bat, might have been the victim of a hate crime† (HateWatch.org). Even though the number of hate crimes has gone down, a poll was taken and â€Å"Nearly 4 out of every 10 homosexuals polled said they fear that anti-gay violence will be directed against them personally, and 32 percent said they've been physically attacked because they are homosexual.† (HateWatch.org). On the other hand, being gay goes against the beliefs and values of some Christian churches. As stated in the bible: â€Å"Do you not know that the un righteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God† (Corinthians 6:9-10). Or another passage: â€Å"If a man lies with a male as he lies with a woman, both of them have committed an abomination. They shall surely be put to death. Their blood shall be upon them." (Leviticus 20:13). With gays not backing down and religious people not backing down, this situation will have a difficult time being resolved anytime soon. Secondly there are many issues that do not help the problem at all, thus creating controversy around the situation. The first problem is the issue of gay marriage. All in favor believe that a gay couple should have the right to get marri... ...N. Equality practice : civil unions and the future of gay rights. New York: Routledge, 2002. Gallagher, John. Perfect enemies : the battle between the religious right and the gay Movement. Lanham [Md.]: Madison Books, 2001. Gil, Tony. Personal Interview. 4 Dec. 2002. Harris, Brandon. Personal Interview. 4 Dec. 2002. Kranz, Rachel. Gay Rights. New York: Facts on File, 2000. Minton, Henry L. Departing from deviance : a history of homosexual rights and emancipatory science in America. Chicago: University of Chicago Press, 2002. Nomad. Ex-Gay Nomad. 4 February 2002 < http://members.aol.com/exgaynomad>. Richards, David A. J. Identity and the case for gay rights: race, gender, religion as Analogies. Chicago, Illinois: University of Chicago Press, 1999. Silverman, Bryan. Personal Interview. 4 Dec. 2002. Stein, Arlene. The stranger next door : the story of a small community's battle over sex, faith, and civil rights. Boston: Beacon Press, 2001. Thomas, Laurence. Sexual orientation and human rights. Lanham, Md.: Rowman & Littlefield, 1999 Thompson, Andrea. â€Å"Pediatrics Endorse Gay Adoption.† NBC News and News Services <http://www.msnbc.com/news>.

Essay --

Throughout history, industrialism by the west (i.e. England, France, and Spain) has led to many conflicts between them and the indigenous, native, people whom lived there. One indigenous group of people affected by western imperialism is the Native Americans in North America. The Europeans that settled onto the â€Å"New World† were confronted by Native Americans, and were faced with violent conflicts. These conflicts led to a belief that all Native Americans are savages as well as heathens (Democracy, 2012). This led to the Europeans to start to kill Native Americans, or kick them off of their land and place them onto reservations. Reservations were usually small and unusable land. But, other times, the chief was forced to sign treaties with the Europeans. These treaties usually stated that the Europeans had a right to be on the land, and if they were allowed to have some land as well as do colonize there, no conflict would occur. Yet, after the treaties were signed, the Europeans and Native Americans still had violent conflicts (Democracy, 2012). Today, there are very little Native Americans left in North America. Some of them are very poor, but some of them are rich due to the casinos they own within the reservations upon which they live. The treatment of these people original was harsh as well as cruel, and there is evidence of that today due to the low population of Native Americans within North America. Another group of indigenous people that have been wrongly treated is the native people of Africa. The indigenous people of Africa were taken over by Western European nations without them knowing. This was because, these western nations had all divided Africa into nations based on their natural resources at a meetin... ...a is also, in association with other organizations that are attempting to assist the aboriginal people of Australia (Australia, 2013). The Oxfam Australia organization has done much in the way of educating the continent of Australia, and the aboriginal youth within Australia, in order to make the aboriginal culture as a whole strong and to have a more satisfying life as well. Australia had been imperialized by the British for their natural resources, and had used the aboriginal people there as well. They took their land, their people’s lives and their way of life, for Britain’s own gain. The aboriginal population has gone down due to these events, but with the help of organizations like NACCHO, and Oxfam Australia, the aborigines are able to make an attempt to regrow their population. They will also, try to keep hold as well as reteach their cultural beliefs.

Annie Leibovitz Biography and Image Sample Analysis

Annie Leibovitz is a famous American portrait photographer and is best known for taking extraordinary and yet unique photos of celebrities. She is one of the most demanded photographer for celebrity pictures and became a celebrity herself that way. Most of the photographs she taken have been featured mostly in magazines such as Rolling Stones, Vanity Fair and Vogue. Leibovitz has always been interested in the arts since a young age. Her mother was a dance instructor and influenced her to take dance classes not only from her, but from many other teachers. In high school she focused in music. She specialized in the guitar and wrote numerous songs, eventually becoming the head of her schools’ folk sing club. When she attended university however, she took an interest in visual arts and considered being a painting instructor as a career. It wasn’t until her family was stationed in the Philippines (her father was an Air Force lieutenant colonel) and a trip down Japan, that she was awestruck by the wonderment of photography. When she went back to school, she took night classes for photography. â€Å"A thing that you see in my pictures is that I was not afraid to fall in love with these people.† – Annie Leibovitz. This quote is a little look of how she sees her images, and how much she loves what she takes. Indirectly she also means that we should love what we take pictures of because what's the point of making others like a photograph you don't like. Photograph One â€Å"Where Romance is Celebrated† (2009) This is a photograph featuring Zac Efron as Prince Philip and Vanessa Hudgens as Princess Aurora in the Disney film, Sleeping Beauty, recreating the awakening kiss scene. This is one of the many photographs Leibovitz took for Disney Parks â€Å"What will you Celebrate?† campaign portraying highlight movie moments of different Disney animations. The atmosphere of the photograph is enchanting and the gesture of the two faces together is quite romantic. The costumes and make up enhances the features of the models, making them look too perfect. The dark background and roses make the photo also very surreal; almost fairy tale-like. In this photograph the roses and the bed frames around Efron and Hudgens to make emphasis on them together. Leibovitz also uses Rule of Thirds to make their faces the centre of interest. She uses artificial lighting above them making an angelic effect and intensely shines on the princess's face, making her complexion paler thus contrasting with the dark background. Photograph Two â€Å"John Lennon and Yoko Ono† (1980) In this photograph is the last photograph ever taken of John Lennon embracing Yoko Ono naked on a bed before he was assassinated. It is an intimate moment between the two; holding each other tenderly while he's giving her a kiss displays their deep love for one another. The bareness and position he is in also displays the vulnerability of human passion. The one evident compositional element is making John Lennon the centre of interest, by making the eye focus on him because he's curled up in a ball or fetal position. Also Yoko's black clothing contrasts Lennon's light skin. Leibovitz uses natural lighting, but since this is on of her earlier photographs the lighting is nothing to creative and simple. Conclusion and Legacy In the being the majority of her images were in black and white because of her lack of education, but later self taught herself about colour development and uses that more often. Leibovitz approach to taking her images is unexpected and out of the box; one never really knows what her next piece will turn out. She captures her effects with artificiality, flair and outrageousness that makes her artwork different from other portrait photographers. Generally she doesn't really care about other's opinions on how to take photos and often gets in trouble by the media by doing things that might offend other people. But all in all, we should admire her genius as a photographer and her â€Å"risk taking† attitude on how to interact with her subjects and audience. I first got interested in Leibovitz because of the Miley Cyrus incident and the work we went over in class, she truly is fascinating in how she see celebrities in such unusual poses. Out of the two photographs that I chose in this essay, the one I like the most is â€Å"Where Romance is Celebrated† because the Disney series are my favorite works by her. I just can't help loving and reminiscing my childhood.