The Physics Of Gas Chromatography Essay - 1814 Words

In gas chromatography, the components of the sample, (which can be called solutes or analytes), separate between two phases – a stationary phase that has a large surface area and a gas phase that permeates through the stationary surface (McNair Miller, 1998). The technique begins when a few microliters of liquid sample are injected into a port and it becomes vaporized to a gas in the chamber. This starts the mobile phase (also known as the carrier gas). Then, an inert carrier gas is fed into the injection port chamber containing the sample in gas form, and pushes the gas molecules through (Hübschmann, 2001). It is important that the carrier gas is inert so that it doesn’t react with the different molecules of the sample we are trying to separate. Once in this first chamber, it begins to heat and travel through a long coiled tube called a gas chromatography (GC) column. The next stop on the coiled column is the detector, which identifies the amount of each compound is present in our sample. There are a series of factors that affect the rate at which compounds reach the detector which will be described in the following sections, but for now it is important to note that the lower boiling point and the less molecular weight, the faster the sample components will separate and migrate to the detector (McNair Miller, 1998). Any individual peak produced can widen or enlarge as the chromatographic analysis ensues (McNair Miller, 1998). In addition, the area of each peak isShow MoreRelatedInvestigating The Substances Of Water Chromatography1350 Words   |  6 Pagesmight be present in a sample. Chromatography is one of the first tools used in such situations. In this technique, many types of mixtures can be separated into the component pure substances; by comparison to a standard sample, each component substance can also be tentatively identified. Many v arieties of chromatography exist, each one designed to separate specific types of mixtures. The common feature of each type of chromatography is that a mobile phase (a liquid or gas) is pushed through a stationaryRead MoreMass Spectrometry ( Working Principle )1050 Words   |  5 Pagessample under investigation, it then separates them according to their specific mass-to-charge ratio (m/z), and then records the relative abundance of each ion type. The first step in the mass spectrometric analysis of compounds is the production of gas phase ions of the compound, basically by electron ionization. This molecular ion undergoes fragmentation. Each primary product ion derived from the molecular ion, in turn, undergoes fragmentation, and so on. The ions are separated in the mass spectrometerRead MoreThin Layer Chromatography And Column Chromatography1774 Words   |  8 Pages Thin Layer Chromatography and Column Chromatography By Maggi Shelton Under the Supervision of Dr. Mills Chavonda The Department of Chemistry and Physics Milledgeville, GA 31061 â€Æ' Abstract: Thin layer chromatography and column chromatography are two different methods that allow for the separation of two miscible solvents. Through column chromatography, a mixture of nonpolar fluorine and polar fluorenone was successfully separated. Thin layer chromatography was then used in order to determineRead MoreEssay on Forensic Science1603 Words   |  7 Pagesdegree and an apprenticeship in a medical examiners office. In the field of forensic science, there are many subspecialties. They include odontology (the study of teeth), anthropology(the study of human beings), psychiatry, biology, chemistry, physics, toxicology (the study of poisons), and pathology (the examination of body tissues and fluids). The medical examiner may call upon forensic scientists who are specialized in these fields for help in a crime investigation. Toxicology is a branchRead MoreThe Origin Of The Word Dna And The Science World Is Well Known Essay993 Words   |  4 Pageson July 25, 1920 to a well-known Jewish family, Rosalind Franklin was noted for her cleverness and outspokenness. She was sent to St Paul’s Girls’ School which was known for its strict and demanding academics, which included amongst its subjects, physics and chemistry. School friends later recalled that she was â€Å"best in science, best at maths, best in everything.† http://www.livescience.com/39804-rosalind-franklin.html Rosalind’’s father wanted her to go into the line of social work, but at age fifteenRead MoreAnalytical Chemistri Intro1796 Words   |  8 Pagesaquatic organisms, plants and animals. 17 Geology Geophysics Geochemistry Palaeontology Paleobiology Biology Botany Genetics Microbiology Molecular biology Zoology Chemistry Biochemistry Inorganic chem. Organic chem. Physical chem. Physics Astrophysics Biophysics Environmental sciences Ecology Meteorology Oceanography Analytical chemistry Medicine Agriculture Agronomy Animal science Crop science Food science Soil science Horticulture Engineering Civil Chemical ElectricalRead MoreSynthesis Of Triphenylamine Based Dye And Fabrication Of Dssc Device3205 Words   |  13 Pages Figure 1: Principle of operation of a DSSC. In this scheme, CB is the conduction band of the TiO2.HOMO LUMO are dye’s energy levels. Block 3: Graph detailing the intensity of solar radiation received on Earth’s surface , Figure 2 - In physics, the Shockley–Queisser limit or detailed balance limit refers to the maximum theoretical efficiency of a solar cell using a p-n junction to collect power from the cell Subsequently, to achieve maximum efficiency of conversion of solar energy intoRead MoreAbstract Nuclear Medicine: Radiopharmacology12701 Words   |  51 PagesReactor-Produced Radionuclides and Generator systems Therapeutic RPs Diagnosis RPs Physical Principles of PET PET RPs Bone-seeking therapeutic RPs Development of new RPs References imaging of the whole body based on certain cellular receptors or functions, as Ga-67 scan, used in PET scan, [1,14]. Diagnostic tests in nuclear medicine exploit the way that the body handles substances differently when there is disease or pathology present. The radionuclide introduced into the body is often chemically bound to aRead MoreExample Of Data Processing8068 Words   |  33 Pagesby electronic noses (Schiffman et al., 2000). The elimination of this weakness may allow electronic noses to become a cheaper, quicker, and more mobile means of mold detection than the traditional methods of polymerase chain reaction (PCR), gas chromatography-ma ss spectrometry (GC-MS), and mycological analysis (Paolesse et al., 2006). The use of electronic noses may prevent numerous cases of SBS caused by the growth of fungal contaminants, including those of Alternaria, Aspergillus, Chaetomium,Read MorePharmaeutical Industry Training Report with Deep Description of Different Area in Ibn Sina Pharmaceutical Industry Ltd.14426 Words   |  58 Pages | |Potentiometer |Potentiometer | |HPLC( High Performance Liquid Chromatography) |Sonicator | |Atomic Absorption Spectrophotometer |Vacuum Oven | |UV- Spectrophotometer

Descriptive Essay An Artist - 1336 Words

I~Before You Start Your Day There was never a day where my desire to paint the sky vanished. It was like a need that had to be fulfilled before anything else. And it wasn t just the sky I wanted to paint—it was the whole world. When I was younger, my mom never fancied the idea of me becoming an artist. It s unjust, my mom would say. ‘An artist is nothing more than a dead-end job that will do nothing for you. You need to become something else. Some dreams are just not meant to be persuaded.’ She wasn t wrong about some things. There comes a point in life where some dreams just aren t for others to pursued. However, this wasn t a dream; it was my whole world. I wish she could believe that.†¦show more content†¦The bruises and cuts painted on his body showed it. And then people would start to say that Levi was a horrible person. That perhaps he had even killed a man. Which makes me laugh just thinking about it. I mean, imagine a kindergartener jumping an o lder man? How pathetic would that be? However, those harsh, gray eyes did, in a way, look like he could kill you in a split second. I saw Levi as an unfinished canvas; awaiting for more colors to return. He, however, cannot do it himself. All he needed was a little splat of color from the one who held them. I guess no one else saw him that way, but the rumors were nothing more than to clarify his judgment on immorality. Of course, as the person I was and possibly am now, my heart wanted to get closer to him. It was weird, wanting to get closer to a boy I never really understood. Perhaps it was my brain talking or the sorrow bursting through me, but I d never met a boy who seemed as lost as he was. With all the negativity coming his way, all I saw was a boy who didn t talk to anybody in between classes. Or the boy who sat alone during lunch. That was the boy I saw, so I had thought—with all my happiness I had installed with me— perhaps I could allow him to borrow some of mine. The thing about those rumors were that they weren t the type to make fun of. Like getting abused at home wasn t something you d laugh at. When teachers got caught of this, I remember they dShow MoreRelatedCompare and Contrast Essay866 Words   |  4 Pagesï » ¿ Compare and Contrast: â€Å"Fish Cheeks† and â€Å"Caged Bird† Rachael Becker Assignment 5 Nicole  Yurchak 1/30/2014 The differences between a narrative and a descriptive essay determine the way in which the reader receives the story. The purpose of each is still very clear, to connect to the reader using story telling. In order for the reader to receive the story as intended, the author must create a clear picture of;Read MoreAtwood, Neel, And Feminism1645 Words   |  7 Pages26, 2014 â€Æ' It may seem clear to most people that authors and artists are completely different in more than few ways. For one, their job descriptions have nothing in common. Authors write, and artists draw, sketch, and paint. Authors need to be grammatically correct, while an artist’s mistake can make their work unique, and abstract. With the endless list of differences, comes the one thing that people fail to realize. Authors and artists do one thing, they create from their minds, and they birth theirRead MoreComparing Dada to Pop Art Essays1420 Words   |  6 Pagesï » ¿Comparing Dada to Pop Art In this essay I will compare the Dada and Pop Art movements by depicting the characteristics of each art period, their style and social conditions that may have influenced the creation of each movement. The essay will describe the relationship between the Dada and Pop Art movements. The essay will show their similarities, differences, and the reason why Pop Art did not continue with the Dada tradition although Pop Art also utilized everyday objects as subjects toRead MoreThe Russian Countryside And Alekhin s Estate Essay754 Words   |  4 Pagessimilar methods but having key differences that set them apart. Both articles serve their purpose of describing and critiquing â€Å"Gooseberries†, but Chris Power’s personal thought and well-described details enhance his article and establish it as the best essay to capture the meaning and feeling of â€Å"Gooseberries†. On the topic of setting, both articles agree that the setting of the Russian countryside and Alekhin’s estate gives the feeling of comfort, especially in contrast to Ivan’s moralistic story. TheRead MoreThe Thought Of Truth And Landscape Photography1833 Words   |  8 Pagesand using the way a camera sees the world to record it’ in this quote Mumford explains that photography is about how the artist represents the subject in a frame. The artist can alter the image so easily to make it different to the original image. Creating style, which is individually different to everyone. However, is changing the original image representing the truth? My essay describes how landscape photography shows the truth, and how photographers respond to critical viewers with a strong theoryRead MoreAnalysis Of Langston Hughes Poem, The Negro Artist And The Racial Mountain Essay1402 Words   |  6 Pagesespecially those influenced by different racial and ethnic backgrounds. To demonstrate my point, in this essay I shall be discussing in detail Langston Hughes and his piece Poem and why it should be included in the Norton Anthology of Poetry. I will contrast and compare it with Christina Rossetti’s Remember, and back up my arguments with selected quotes from Langston Hughes’ essay ‘The Negro Artist and the Racial Mountain’. To begin, Langston Hughes’ ‘Poem’ is an example of how few words can stillRead MoreThe Basis Of Hume s Theory1398 Words   |  6 PagesThe basis of Hume’s essay is in regards to aesthetics, he offers his definition of the â€Å"standard of taste† from the standpoint of even the best critics. Throughout the essay, Hume reaches his conclusion by â€Å"both his characterization of the appreciative response and by his particular way of drawing the distinction between the subjective and the objective,† (Carroll). From the beginning of the essay, it is noticed that Hume’s theory is representative of a paradox. He states, â€Å"The great variety of TasteRead MoreThe Effects Of Hip Hop Music On Adolescents862 Words   |  4 Pagescommon reason for the concern has been appropriately summed by Arnett (a Research Professor of Psychology at Clark University in Worcester, Massachusetts), who explained, women are used as props for the illusive lif e the music video is portraying the artist to have. The concern that hip-hop culture, as seen in music videos, has become heavily influential on young people’s views of sexuality. The concern about mainstream hip-hop music and music videos sexualizing women, in particular, is so omnipresentRead MoreThe Survival Of Indigenous Visual Cultures1379 Words   |  6 PagesThere are different approaches used when discussing the survival of indigenous visual cultures. Each essay provided for analysis interprets the conquest of the Americas differently and connects it to Colonial Mexico artistic production at various degrees. Each essay also advocates for its own term that can be used to represent the process of Spanish and Indigenous art forms coming together in a complex cultural context. Kubler advocates for the term, folk art to describe colonial art because it isRead MoreHume s Paradox And The Standard Of Taste1527 Words   |  7 Pagesprejudice, can alone entitle critics to thi s valuable character; and the joint verdict of such, wherever they are to be found, is the true standard of taste and beauty,† (Hume 109). This idea follows the idea that beauty is a feeling rather than a descriptive term as well. Of the Standard of Taste provides the notion that the feeling of pleasure is based on praise. Hume uses his paradox to explore the feeling beauty captures while adhering to specific conditions. Additionally, Hume believed that â€Å"the

Campuses of colleges Free Essays

A century ago,the campuses of colleges and universities across the United States might as well have hung out a sign that read â€Å"Men Molasses’s all of the students and faculty were male. There were a small number of women’s colleges, but many more schools-including some of the best known U. S. We will write a custom essay sample on Campuses of colleges or any similar topic only for you Order Now Universities such as Yale, Harvard, and Princeton-barred women outright. Since then,women have won greater social equality. By 1 980, the number of women enrolled at u. . Colleges finally matched the number of men. In a surprising trend, however, the share of women on campus has continued to Increase. As a result, In 2005, men accounted for only percent of all u. s. Undergraduates. The gender gap Is evident In all racial and ethnic categories and at all class levels. Among African Americans on campus, only 33 percent are men. The lower the Income level, the greater the gender gap In college attendance. Meg Delano noticed the gender Imbalance right away when she moved Into her dorm at the university of Georgia at Athens; she soon learned that just 39 percent of her iris-year classmates were men. In some classes,there were few men, and women usually dominated discussions. Out of class, Delano and many other women soon complained that having so few men on campus hurt their social life. Not surprisingly, most of the men felt otherwise. What accounts for the shifting gender balance on U. S. Campuses? One theory is that many young men are drawn away from college by the lure of Jobs, especially in high technology. This pattern is sometimes termed the†Bill Gates syndrome,† after the an who dropped out of college and soon became the world’s richest person by helping to found Microsoft. Thus,many boys have unrealistic expectations about their earning power if they don’t have an education. In addition, analysts point to an anti-intellectual male culture. More young women are drawn to learning and seek to do well in school, whereas some young men attach less Importance to studying. According to Judith Killed,in the Journal Gender Issues, stereotyping is also holding boys back, Because girls generally have more plopped social skills and are better behaved than boys, they perform better In school, which then prÐ ²?pares them for college. Boys,on the other hand, are often labeled as less cooperative and more likely to act out In classrooms, which can affect their grades. Rightly or wrongly, more men seem to think they can get a good Job without Investing years of their lives and a considerable amount of money In getting a college degree. Many college officials are concerned about the lack of men on campus. N an effort to attract more balanced enrollments† some colleges are adopting what amounts to affirmative action programs for males. But courts In several states have already ruled such polices Illegal. Many colleges,therefore, are turning to more active recruitment; admissions officers are paying special attention to male applicants stressing a college’s strength in mathematics and science-areas striving to increase their share of minority students, the hope is that they can also succeed in attracting a larger share of men. How to cite Campuses of colleges, Papers