Chromatography –mass

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  • Gas Chromatography Mass Spectometry (viết tắt là GC-MS hoặc GCMS, tạm dịch là Phương pháp Sắc ký khí kết hợp với Khối phổ) là một phương pháp mạnh mẽ với độ nhạy cao được sử dụng trong các nghiên cứu về thành phần các chất trong không khí. Bản chất GC-MS, đúng như tên gọi của nó, là sự kết hợp của Sắc ký khí (Gas Chromatography) và Khối phổ (Mass Spectometry).

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  • Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry

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  • Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Determination of Roxithromycin by Liquid Chromatography/ Mass Spectrometry after Multiple-Dose Oral Administration in Broilers

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  • Gas chromatography – chromatography using a gas as the mobile phase and a solid/liquid as a stationary phase – In GC, the analytes migrate in the gas phase, so their boiling point plays a role – GC is generally applicable to compounds with masses up to about 500 Da and with ~60 torr vapor pressure at room temp (polar functional groups are trouble) Supercritical fluid chromatography – chromatography using a supercritical fluid as the mobile phase and a solid/liquid as a stationary phase – In SFC, the analytes are solvated in the supercritical fluid – SFC is applicable to a much ...

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  • Liquid chromatography mass spectrometry (LC-MS) is a valuable tool in the analysis of proteins and peptides.The combination of LC-MS with different fragmentation methods provides sequence information on components in complex mixtures.In this work, on-line packed capillary LC electrospray ionization Fourier transform ion cyclotron resonance MS was combined with two complementary fragmentation techniques, i.e.

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  • Statistical analysis has also meant that no generalisation regarding the kind of student least likely to improve (or likely to regress) can be reliably made. Nevertheless, it is interesting to consider the characteristics of each of the individuals who did regress in their IELTS Test results. Table 12 gives data relating to the six students whose IELTS Test results in Test 2 were lower than in Test 1. Five of the six students who regressed were studying Nursing and four were of East or South Asian language background. Four were in the older age group and four had an...

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  • GSMS là một trong những phương pháp sắc ký hiện đại nhất hiện nay với độ nhạy và độ đặc hiệu cao, được sử dụng trong các nghiên cứu và phân tích kết hợp.

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  • A text/reference regarding the structure and function of components used in perfume development and the process of developing perfumes. Covers gas chromatography, mass spectrometry and a host of other analytical techniques; the esthetics and techniques of perfume development; the manifold and ever-changing safety-related requirements of countries and customers; concerns about the environmental impact of materials and impurities which affect the perfumer's work.

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  • Great efficiencies have been achieved in the drug discovery process as a result of technological advances in target identification, high-throughput screening, high-throughput organic synthesis, just-in-time in vitro ADME (absorption, distribution, metabolism, and excretion), and early pharmacokinetic screening of drug leads. These advances, spanning target selection all the way through to clinical candidate selection, have placed greater and greater demands on the analytical community to develop robust high-throughput methods.

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  • Recent advances in mass spectrometry have rendered it an attractive and versatile tool in industrial and academic research laboratories. As a part of this rapid growth, a considerable body of literature has been devoted to the application of mass spectrometry in clinical studies. In concert with separation techniques such as liquid chromatography, mass spectrometry allows the rapid characterization and quantitative determination of a large array of molecules in complex mixtures.

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  • Flow cytometry is a technology that simultaneously measures and analyses multiple physical characteristics of single particles, usually cells, as they flow in a fluid stream through a beam of light. The properties measured include a particle’s relative size (represented by forward angle light scatter), relative granularity or internal complexity (represented by right-angle scatter), and relative fluorescence intensity.

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  • The contamination of metals is a major environmental problem and especially in the aquatic environment. Some metals are potentially toxic or carcinogenic even at very low concentration and are thus, hazardous to human if they enter the food chain. Metals are usually dissolved into the aquatic system through natural or anthropogenic sources. Metal ions are distributed thoroughly during their transport in different compartments of the aquatic ecosystems, in biotic or abiotic compartment such as fishes, water, sediment, plant.

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  • Before the days of mass literacy, medicine was more art than science, and people recognized a pharmacy by the four traditional colored bottles that represent earth, fire, air, and water. Medicine has come a long way since the days of the apothecary with its impressive collection of powders and bottles; drugs today are highly regulated and must comply with standards set by the U.S., Europe, Japan, and other countries. A drug must be shown to be efficacious and meet rigorous standards of purity, composition, and potency before being approved for use in the patient populatio...

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  • The 2011 survey instrument is similar to the 2009 survey. However, a few important changes were made to cover a broader array of non-bank financial services, and to improve and streamline data collection. Most notably, the 2011 survey added non-bank remittances as AFS covered in the survey and revised questions related to the time- frames during which households used AFS. The revisions to the 2011 survey also streamlined the questions about the reasons households do not have a bank account.

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  • Nowadays, Chromatography is the most versatile and widespread technique employed in modern chemical analysis and plays a vital role in the advancement of chemistry, biology, medicine and related fields of research. Because of the inherent simplicity and ease of operation, it can be used together with a wide range of detection systems, including electrochemical, photometric and mass spectrometry, being an invaluable laboratory tool for the separation and identification of compounds.

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  • "To secure fish communities, based on self-sustaining stocks of stable, supplemented by proper cultivation of fish seed production and supply from the optimal contribution to the community of fish, fishing opportunities and associated benefits to meet needs identified by society: healthy food, entertainment, employment and income, and a healthy environment of man. " Included in the Joint Plan is a directive to all Committee Lake to fish for community development Objectives (FCOs) for each lake....

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  • When revealing many such cause-effect relations and hidden phenomena, hand-held instrumentation gives additional references for existing basic measurements such as pH, conductivity, and redox potential. This work also took in use measurements which have not been traditionally used in papermaking such as measurement of halogens, dissolved calcium, and dissolved oxygen contents. ATP content measurement using a portable luminometer was found to be useful and easy-to-use method for evaluating microbial activity and optimizing biocide performance at paper mills.

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  • The water-soluble crude polysaccharides obtained from the liquid culture broth of Cordyceps militaris by ethanol precipitation were fractionated by DEAE cellulose and Sepharose CL-6B column chromatography. This fractionation process resulted in three polysaccharide fractions that were termed CPSN Fr I, CPSN Fr II, and CPSN Fr III. Of the fractions, CPSN Fr II was able to upregulate the functional events mediated by activated macrophages, such as production of nitric oxide (NO) and expression of cytokines (IL-1 and TNF-).

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  • Owners of high cash businesses used multiple cash equivalents from different banks and money services businesses to pay into policies and annuities. In one case, an insurer reported the owner of a landscaping business who paid the premiums on a universal life insurance policy with multiple money orders of no more than $1,000 each, some purchased on the same day at different post offices, or on separate visits to the same post office, creating the appearance of structuring.

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  • In the past, the government often tried to ensure that we pay "a fair rate" of interest by implementing usury ceilings or limits on the rates that lenders can charge. During the 1980s there was a general trend toward eliminating or raising these limits as policy-makers reacted to the high inflation and record interest rates of the late 1970s. During the early 1990s, however, the trend reversed as some suggested that caps should be placed on credit card rates, which remained at historically high levels while other key interest rates declined significantly.

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