ADHD Epidemic Research Paper Example | Topics and Well Written Essays - 1000 words

ADHD Epidemic - Research Paper Example in style(p) research shows significance of the disorder in the society and dangers of administered drug for treatment of ADHD.ADHD was discovered in the second half of the twentieth century. Stolzer (2007) explains that by the course of study 1950, no case of the disorder had been reported in the United States. This however changed and changed and 2000 cases had been reported in the nation two decades later. The timeline therefore defines between the family 1950 and the year 1970 as the period within which the disorder was discovered.ADHD is a psychiatric disorder and not a biological complication as some may argue. Its history is the first to justify this. Some of the behavioral traits of those diagnosed with the problem were previously considered normal and only a change in classification of these traits has occurred. ADHD was excessively classified as a psychiatric disorder and according to Stolzer, it is a mythical disease and not a real disease. Behaviors that are currently employ to diagnose ADHD are also historical behaviors that have in the past been considered normal. There has also been a disproportionate statistics of the complication in the States and this undermines reality of the complication as a disease. Methylphenidate is the most commonly used drug for management of ADHD symptoms but its high usage in the United States, compared to usage in other parts of the world raises concerns on reality of ADHD in the nation. At least 80 percent of produced methylphenidate, worldwide, is consumed in the United States for management of the complication but prevalence of ADHD in the nation, relative to the global incidence cannot be proportionate to the drug usage. In addition, incidence of ADHD has not been consistence across time, animal species, and even nations and this suggest its mythical existence in the United States. The media and pharmaceutical companies could be credited for

Descriptive Statistics Essay Example | Topics and Well Written Essays - 500 words

Descriptive Statistics - Essay ExampleIn simple words, the results are not accurate because the last patients survival of 45 weeks is an exceeding entry that has alone a considerable impact on measures of central tendency in this study. Recall that the standard deviation defines an area below and to a higher place the mean about which it is expected that a majority of the scores will fall. The researchers therefore, would be required to submit another set of results on 12 raw entries to estimate the mean and central tendency measures. Additional money to researchers will then be granted if they come up with satisfactory results. Research system Null Hypothesis H0 - ? = 9.6 Alternative Hypothesis Ha = ? 10 The original claim is that the mean number of weeks that a prostate cancer patient lives later receiving a confirmed diagnosis of being in stage 4 is 9.6. Whereas, the new case study considers that it is above 9.6 therefore, there is need to conduct a statistical test of singl e average. Test Statistic Variables The independent variables include the age of cancer patients, financial situation of participants etc. The dependent variables may include checkup checkups and patients personal care. Selection, Problems and Ethical Issues The cancer patients in stage 4 will be selected randomly without identifying their forecasted survival life in weeks by doctors and medical representatives. Indeed, this is an effort to avert any possibility of biases in the study.

Ethics Essay Example | Topics and Well Written Essays - 1000 words - 17

Ethics - Essay ExampleDogmatism is common in all religious settings where the scriptures be accepted and acknowledged as the truth without any questions. Once an individual is a dogma and invites these believes and let them control their whole being, he or she mechanically become an absolutist and decides to take the belief as the single living truth and let nothing interfere with what they have come to know as the only reality (Gurvitch 135). Dogmatism is usually followed by authoritarianism beca persona once people have faith in something and recognize it as the only existing truth, then they absolutely encircles it without having any doubts most it.Dogmatism and absolutism are basically two sides of the same coin. Once an individual believes in the perfection of a certain belief, they are inevitably forced to accept it as it is. The human mind is narrow, and it is easier to accept than to take further steps to confirm the laid trim opinion (Gurvitch 134). The mind likes simp lified things no wonder it does not go the distance to prove or confirm the truth.Dogmatic absolutism results to the formation of soaked individuals who only believe in what they know, and are not willing to accommodate further change. For instance, an individual may have a certain perspective about a family member who has been accused of a crime. The opinion of this person will not change even if the evidence uncovered suggests that he is guilty. Dogmatic absolutism is evident, in this case, as the rigidity is still manifested even after evidence contrary to the belief is uncovered (Gurvitch 141). Another point of view has no use because the mind of this individual is made up and nothing can alter this belief or opinion.In religious institutions, dogmatism always leads to absolutism. This is because once a person has accepted a certain faith as the only one and the true one, then it become hard to change their opinion. They are only dedicated to that particular faith and any

Sleep in Sports Essay Example for Free

Sleep in Sports EssayCheri Mah of the stanford sleep disorders clinic and research laboratory has been following sleep patterns and the effects on the athletes performance. One of her experiments was with the Stanford University tennis team. For five weeks each member of the tennis team was to get ten hours of sleep per night. Those who increased their sleep time ran faster sprints and compete at the best of their ability. Mah found that getting extra sleep over a couple of weeks improved an athletes performance, mood, and alertness for all athletes. Sleep is very classic for collegiate and professional athletes who have full schedules and often travel for games. Athletes can easily struggle with getting enough sleep due to being so busy through out each day. This slows down the athletes alertness and performance level to a minimum. Many athletes have set personal bests and have humbled school and also world records by just getting enough sleep. The reason behind this is becau se while a person is in what they call inscrutable sleep, is when a growth hormone is released. These hormones stimulate muscle growth and repair body parts such as bones and muscles.The hormones also help cut down fat keeping the athlete in top shape. REM sleep also provides energy to both the brain and the body. If sleep is cut short, the body doesnt have time to complete all of the phases needed for muscle repair, memory consolidation and the release of hormones. So how much sleep does an athlete need? The execute is seven to nine hours per night for adults and nine to ten hours for adolescents and teens. Athletes can tell by falling asleep within twenty minuets of going to bed and waking up without an alarm means that they are getting the right amount.

Jane Cazneau Essay Example for Free

Jane Cazneau EssayHudson posits a Native American grandmother, although there is no solid evidence of this. Her first marriage apparently dissolved, but there is no divorce record. She may or may not have had an action with Aaron Burr, an early mentor. Hudsons most significant claim is that Jane assail is the journalist who coined the phrase manifest destiny (pp. 60-62). Hudson argues that later historians have simply assumed that John OSullivan wrote the participatory Reviews many unsigned editorials.But Hudsons computer analysis (Appendix B) of OSullivans and impels signed works shows that the grammatical errors in the famous editorial that first contained the phrase exhibit a much closer correlation with those commonly made by Storm than with those made by OSullivan. What is certain is that she migrated to pre-revolutionary Texas and speculated in land grants and immigration schemes. Writing downstairs the pen name Montgomery (later, Cora Montgomery), Storm became a reg ular correspondent of Moses Y.Beachs New York Sun. When war broke out, Storm accompanied Beach and his daughter on a covert peace mission to Mexico in late 1846. The Beach mission has long been clouded with uncertainty about its purposes and accomplishments, and so Storms role in it is similarly in doubt. Nonetheless, she was clearly an important element, as neither of the Beaches knew Spanish and President James K. Polk had a private interview with her after her return. After the war, Storm continued to favor U. S. xpansion into Latin America and the Caribbean, especially through annexation. Although Hudson maintains that Storm was not a strong proponent of All Mexico during the U. S. -Mexican War, some have ascribe her with leading the movement. She had contact with Cuban, Mexican, and Nicaraguan filibustering groups. She married diplomat Williams L. Cazneau in 1849 after a long acquaintance but still worked as a journalist for numerous publications, wrote about her travels, and remained active in Democratic Party politics.She secured a diplomatic mission to the Dominican Republic for her husband and worked with him to gain U. S. access to Samana Bay. Jane Storm Cazneau died in a shipwreck during a storm at sea in 1878. Many questions about her activities and the extent of her influence remain unanswered. Barring the branch of new documentary collections, Hudsons biography is the most complete picture of her life we are likely to have. As such it is a useful addition to the literary works on nineteenth-century U. S. expansionism.

A football match Essay Example for Free

A foot crank plot match EssayAfter analyzing my performance in a foot dinner gown match I was able to notify and identify my strengths in a game and how these had a positive effect on my performance. I have not bad(predicate) awareness and I am also capable of running up and down the right wing to make and receive widenes. Also allowing me to make productive crosses into my opponents area. I have good all over body strength and can use it to stop a defender from tackling me. I can bosh the stumblebum in different directions and keep control of it then I am able to look up and make a successive break away to a team mate in the terminus area and have an increased opportunity of scoring goals to win the match. I always dribble the ball with two feet allowing me to move inwards or outwards so I can confuse my opponents the I put my self into a passing or shooting position very quickly. I also try to use my voice as much as possible and try to communicate with my opposite te am mates and tell them to either pass or shoot the ball.When I am in danger I am able to pass to a near by team mate or clear the ball from my teams half into my opponents half which can be difficult at accredited times. I am also able to header the ball or volley the ball into my opponents goal when one of my team mates crosses the ball into my opponents goal area. I have a lot of speed and strength which can be useful in matches and is an appropriate fitness level at authoritative ages. I may have a lot of strengths but I do also have a lot of weaknesses in attacking and defending.When a through ball pass is made past a defender for me to run to I am sometimes not quick enough to protrude to it or I do not react quick enough to receive the ball. As a result the ball either goes of the pitch or my opponents team defender gets to the ball before me which can reduce my teams chances of scoring goals to win the match. In certain goal scoring opportunities I have the extravagance t o move and make a hard shot but my shot accuracy is very of target and sometimes goes of the pitch or the goal custodian saves it.I am sometimes not in a ready position to receive the ball and seem to make poor contact with the ball when it has been passed or crossed to me. As a right midfielder I need to take advantage of these opportunities and score for my team to win. Into the end of the first half of the game I seem to show weakness in my stamina and seem to be out of breath quite quick. My body feels very exhausted when I finish running up and down the wing and I am unable to move around the wing area quick as I use to move before.When we lose the ball or possession I sometimes walk screen on defence instead of running back to try and tackle the attacker with the ball or help my defenders get the ball back. When my team are taking a corner kick I seem not to be moving around the area so I can get the opportunity to jump up and header the ball into my opponents goal. I have a low shot power in my left foot and hardly use my left foot in matches which could be a big help in certain situations

Intracellular Biosynthesis of Cadmium Sulfide Nanoparticles

Intracellular Bio deduction of Cadmium sulfide NanoparticlesIntracellular biosynthesis of Cadmium Sulfide nanoparticles victimisation conclusion supernatant of Escherichia coliAbstractThere is a growing concern to develop environment-friendly and sustainable modes. Since the synthesis of nanoparticles of different compositions, sizes, shapes and controlled dispersity is an important aspect of Nanotechnology new costeffective procedures are being developed. Microbial synthesis of Nanoparticles is a Green chemistry approach that interconnects Nanotechnology and Microbial Biotechnology. Microorganisms play an important role in the eco-friendly synthesis of metal nanoparticles.Here an endeavour was made to biologically synthesize fluorescent cadmium sulfide nanoparticles. The afford study uses Escherichia coli PTCC 1330 as a potential producer for the green synthesis of CdS nanoparticles. biologically synthesized nanoparticles were characterized and confirmed after 24 h of incubat ion at room temperature using electron microscopy, XRD, explosive detection system and FTIR. The size distribution of the nanoparticles was found to be 5200nm followed by which the consequence of time, growth of the organism, pH, parsimony of CdCl2 and Na2S on the synthesis of nanoparticles were checked. Enhanced synthesis and fluorescence emission of CdS nanoparticles were achieved at pH 9.Keywords Nanotechnology Biological synthesis Silver nanoparticles Escherichia coli Eco-friendly1.IntroductionBionanotechnology has emerged up as integration between biotechnology and nanotechnology for developing biosynthetic and environmental-friendly technology for synthesis of nanomaterials. Nanoparticles are clusters of atoms in the size range of 1 coke nm. Nano is a Greek word synonymous to dwarf meaning extremely small. The use of nanoparticles is gaining impetus in the present century as they posses defined chemical, optical and mechanical properties. The gold nanoparticles are most pro mising as they show good antibacterial properties due to their large surface area to volume ratio, which is coming up as the current interest in the researchers due to the growing microbial resistance against metal ions, antibiotics and the development of resistant strains1-2.Nanoparticles exhibit completely new or improved properties compared to larger particles of the bulk material and these novel properties are derived due to the variation in specific characteristics such as size, distribution and morphology of the particles. Nanoparticles present a high surface area to volume ratio with decrease in the size of the particles1-2.As the specific surface area of nanoparticles is increased, their biological effectivene earth-closet also increase on the account of a rise in surface energy. Nanoparticles have a wide range of applications, as in combating microbes, biolabelling, and in the treatment of cancer. Size control during synthesis of particles is an important criterion in th e arena of silver nanoparticle biosynthesis. Depending on the size of the nanoparticles, their applications branch out. Although AgNPs are synthesized both intra- and extra-cellularly, the latter(prenominal) method of biosynthesisof nanoparticles is highly advantageous because of ease of control over the environment, large-scale synthesis and easy downstream processing notes. It is hale known that the electronic and optical properties of metal nanoparticles are heavily size- and shape-dependent. Controlling the size, shape and surrounding media of metal nanoparticles are important as many of their intrinsic properties are unyielding by these parameters3-8.This study illustrates the synthesis of CdS nanoparticles using the bacterium Escherichia coli PTCC 1330. The morphology of the samples was analyzed using Transmission electron microscopy (TEM) and the particles formed were characterized to be nanoparticles. The size of CdS nanoparticles in sedimentary solution has been calculat ed using UVVis spectroscopy, XRD, EDS, FTIR and TEM measurements. The nanoparticles are found to be polydisperse nanocubes in the size range 5200 nm3.2. Materials and methods2.1. Materials, bacterial strainThe visitation strain was Escherichia coli PTCC 1330, The strain was prepared of IROST, CdCl2 was purchased from Hi Media laboratories, India and Na2S was purchased from Merck, Germany. All different chemicals used are of analytical grade.2.2. Preparation of supernatantsMuller-Hinton broth (MHB) was prepared, sterilized, and inoculated with a fresh batch of evidence strain. The culture flasks were incubated for 24 h at 30C for bacteria. afterward the incubation period, the cultures were centrifuged at 12,000 rpm and their supernatants were used for further experiments.2.3. Synthesis of Cadmium Sulfide nanoparticlesThe obtained supernatants were washed with phosphate buffer saline (pH 7.0) for 3 times. 1mM solution of CdCl2 (for E. coli) was prepared using deionized water. 35 m l of the solution was added to supernatants and resulting solution was kept for incubation in a shaker at 220 rpm and room temperature for 30 min. Then, 35 ml of 1mM Na2S solution was slowly added to the solution. The samples were then incubated at room temperature with end-over-en rotation for 10 min9-10.2.4. Purification of nanoparticlesFor measuring the amount of UVVisible absorption by synthesized CdS nanoparticles, samples were washed twice with 50mM phosphate buffered saline (pH 7.0). Then, inaudible disruption of cells was performed using an ultrasonic processor (Retsch, UR1) over three 45 S periods with 10 s intervals between periods. The sonicated samples were then filtered using a 0.22m filter to eliminate cell-debris and other pollutants. The filtered solutions were then used for characterization of CdS nanoparticles.2.5. Effect of growth parameters on CdS nanoparticles production2.5.1 Effect of CdCl2 and Na2S concentration on synthesis and particle SizesTo obtain the b est concentration of CdCl2 and Na2S that yields the maximum synthesis of nanoparticles and particle-size distribution, CdCl2 and Na2S, at concentrations ranging from 1 to 10mM, was added to the supernatant at pH 9.0 and temperature 30C.2.5.2 Effect of temperature and pH on nanoparticle synthesis and particle sizesTo obtain optimum specializes for maximum synthesis of nanoparticles and particle-size distribution, the obtained the optimum concentration of CdCl2 and Na2S was added to the supernatant and incubated at various temperatures (2530 C) and pH conditions(511). The pH of the incubation mixtures was adjusted using 1MHCl and 1M NaOH solutions. The optimum condition for synthesis of nanoparticles is temperature of 30C and pH of 9.2.6. Synthesis of CdS nanoparticles at various growth phases and time periodTo find the effect of growth phase of the organism on CdS nanoparticles production, Escherichia coli was inoculated into nutrient broth of four different flasks. The flasks were allowed to grow at various growth stages (lag phase, log phase, late log phase and stationary phase). After that the biomass was incubated with cadmium chloride or cadmium sulfate and sodium sulfide solution. The effect of time over the growth was evaluated by collecting the samples at every 1 h up to 120 h. Maximum amount of nanoparticles synthesized by bacterial strain was achieved in stationary phase.3. Results and discussionThe application of nanoscale materials and structures, usually ranging from 1 to 100 nanometers (nm), is an emerging area of nanoscience and nanotechnology. Nanomaterials may provide solutions to technological and environmental challenges in the areas of solar energy conversion, catalysis, medicine, and water-treatment. The development of techniques for the controlled synthesis of nanoparticles of well defined size, shape and composition, to be used in the biomedical ambit and areas such as optics and electronics, has become a big challenge. Development of reliable and eco-friendly processes for synthesis of metallic nanoparticles is an important step in the field of application of nanotechnology.One of the most exciting research areas in modern nano-science and technology is the interaction between inorganic molecules and biological structures. It is well established now that many organisms can produce inorganic materials either on intra- or extra-cellular level. In order to meet the growing demand of nanoparticles, eco-friendly methods for nanomaterials synthesis need to be developed which are free of using toxic chemicals in the synthesis protocol11-13.In addition to gold and silver nanoparticles, semiconductors such as CdS, ZnS, and PbS have been greatly focused on. Development of protocols for the synthesis of such semiconductors (the so-called quantum dots) is growing. These luminescent quantum dots are emerging as a new sept of materials for biological detection and cell imaging, based on the conjugation of semiconducting quan tum dots and biorecognition molecules. Fluorescent nanoparticles (CdS, CdSe, CdTe and etc.) can be used for conjugation of biomolecules instead of organic fluoroprobes such as peptides, antibodies and nucleic acids. Moreover, different electronic catalytic and optical behaviour of CdS and NPs have been investigated before. Also, CdS nanoparticles are used for cancer diagnosis and treatment. CdS is immensely used in field effect transistors, solar cells, light emitting diodes, photocatalysis, photoluminescence, infrared photodetector, environmental sensors and biological sensors 14-18.3.1. Characterization of synthesized Cadmium Sulfide nanoparticles3.1.1. UV-Visible spectrophotometerPurified CdS nanoparticles were dried-out at 30 C for 4 h. The dried particles were dispersed in deionized water and were measured using a UVVisible spectrophotometer (CARY,100Conc, UV Pharma spec1700 with a resolution of 0.72 nm and optical direction length of 1 cm) in the wavelength range of 300-600 nm (Fig. 1). The maximum absorption was at 400-450 nm in UV-Visible spectroscopy.3.1.2. FT-IR and XRD summaryPurification of CdS nanoparticles was carried out according to the method previously described. For FT-IR and XRD analysis, samples were dried. Freezing-drying method was used for this step. First, the samples were frozen at -20C for 24 h and then dried at -37C temperature for 10h with Freeze-drier system(CHRist,ALPHA1-4LD). The obtained dried sample was subjected to FT-IR spectrum (Fig. 3) using Fourier Transform IR spectrophotometer (NEXUS, Germany). The phase formation and purity of CdS nanoparticles were checked by recording the powder XRD patterns (Fig. 2) using an XDL 3000 powder X-ray diffractometer(SEIFERT, 3003PTS). The X-ray diffracted intensities were recorded from 10- to 80- 2 angles. FTIR studies revealed that aminogroups bound to particles account for the stability of NPs. Also FTIR studies established the existence of protein as the stabilizing and capping ag ent.3.1.3. EDS ( Energy Dispersive Spectroscopy)In order to determine the elemental composition of the synthesized nanoparticles, EDS spectrum was recorded. In the recorded EDS spectrum, strong signals showed the presence of Cd and S (Fig. 4). This confirms that the nanoparticles are made of CdS alone. EDS spectrum was recorded based on the micrographs measurements focusing on clusters of the nanoparticles. Resulting EDS spectrum from purified and dried CdS nanoparticle was shown in (Fig. 4). This figure also shows the signals from Cd and S elements from other metals. In the analysis of CdS nanoparticles by energy dispersive spectroscopy (EDS) (LEO 440i, OXFORD), the presence of elemental CdS signal was confirmed. The CdS nanocrystallites display an optical absorption band peaking at 3-4 keV, which is the typical absorption of metallic CdS nanocrystallites due to the surface plasmon resonance.3.1.4. Transmission Electron Microscopy (TEM)Transmission electron microscopy (TEM) (model EM 208 Philips) was used to determine the morphology and shape of nanoparticles. Purified CdS nanoparticles from extra-cellular culture supernatant using centrifugation was characterized by TEM. TEM revealed the average size of particles as 100 nm. TEM images show that they are relatively uniform in diameter and have spherical shape. The different fractions obtained on a continuous sucrose gradient were analyzed. (Fig. 5) shows a representative TEM image recorded from the drop-coated film of the CdS nanoparticles synthesized by treating the CdCl2 and Na2S solution with culture supernatants of E. coli PTCC 1330. The particle size histogram of CdS particles (Fig. 5) shows that the particles range in size from5 to 200 nm and possess an average size of 75.5 nm.In addition, the TEM image shows at least two different areas, one with higher contrast due to the CdS nanoparticles and other with lower contrast probably due to other micro (or even nano) crystals originating from insoluble Cd, S salts.24 h (particles at higher resolution shown by scale bar of a100 nm, b200nm).4. ConclusionsBacterial strain of Escherichia coli PTCC 1330, studied in the present research, can be used in order to biologycal synthesizer of Cadmium Sulfide Nanoparticles under special conditions of Time, pH, Temperature, grow of the organism, concentration of CdCl2 and Na2S.The synthesis of nanoparticle circles around enzyme phytochelatin synthase, which exists in surface of E. coli. This enzyme has been previously used for in vitro synthesis CdS nanoparticle under special conditions . The enzyme catalyzes the reaction of transpeptidation of c-Glu-Cys dipeptide from a GSH molecule to a second molecule of GSH. Thus, phytochelatin synthase enzyme may be involved in the synthesis of CdS nanoparticles.AcknowledgmentsWe would like to express our gratitude to the laboratory of Microbiology, Science and Research branch of Islamic Azad University, Tehran, Iran for its support of this work. We also wish to thank Dr. A. Akhavansepahy, Faculty of Science, North Branch of Islamic Azad university, Tehran, Iran and Dr. M. R. Fazeli, Faculty of Pharmacy, Tehran university of Medical Sciences, Tehran, Iran for their useful advices and supports.