Physico-Chemical

Xem 1-20 trên 29 kết quả Physico-Chemical
  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về y học đề tài: Conventional or physicochemical approach in intensive care unit patients with metabolic acidosis...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về ngành y học đề tài: Clinical review: Renal tubular acidosis – a physicochemical approach...

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Physicochemical characterization of vibriophage N5

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  • Fe-SBA-15 and Fe-SBA-16 ordered mesoporous materials were synthesized via hydrothermal treatment by in situ incorporating Fe(III) oxalate complex species into framework of SBA-15 and SBA-16. The prepared samples were characterized by different techniques such as XRD, BET, UV- Vis and TEM. The obtained results showed that both Fe-SBA-15 and Fe-SBA-16 samples have an ordered mesoporous structure. The hexagonal symmetry of Fe-SBA-15 and cubic ones of Fe-SBA- 16 were not affected by incorporation of Fe into SBA-15 and SBA-16 frameworks.

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  • NovelN,N¢-diacyl-1,3-diaminopropyl-2-carbamoyl bivalent cationic lipids were synthesized and their physicochemical properties in lamellar assemblies with and without plasmid DNA were evaluated to elucidate the structural requirements of these double-chained pH-sensitive surfactants for potent non-viral gene delivery and expression.

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  • We report a comprehensive physicochemical characteriza-tion of a glycoglycerolipid from Mycoplasma fermentans, MfGl-II, in relation to its bioactivityand compared thiswith the respective behaviors of phosphatidylcholine (PC) and a bacterial glycolipid, lipopolysaccharide (LPS) from deep rough mutantSalmonella minnesotastrain R595. Theb«a gel-to-liquid crystalline phase transition behavior of the hydrocarbon chains withTc¼30Cfor MfGl-II as well as for LPS exhibits high similarity between the two glycolipids.

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  • Food analysis is the discipline dealing with the development, application and study of analytical procedures for characterizing the properties of foods and their constituents. These analytical procedures are used to provide information about a wide variety of different characteristics of foods, including their composition, structure, physicochemical properties and sensory attributes.

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  • On average, one ton of hazardous waste per person is generated annually by industries in the United States. Before the Resource Conservation and Recovery Act of 1984, hazardous wastes were improperly disposed of into the environment without any regulation. As a result, remediation of these contaminated sites and management of the ongoing hazardous waste sources are two major tasks to be achieved by treatment technologies.

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  • Because of its accessibility, the intertidal zone has offered excellent opportunities to study the adaptations of individual organisms and populations to their environment, and the factors controlling community composition. Early work on seashores concentrated on the problems of life in an environment characterized by steep gradients in physical conditions, but in more recent years, the focus of research on the fascinating shore ecosystems has been on understanding the processes controlling their productivity and dynamic functioning.

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  • Milk evolved as a means of providing for the postnatal needs of the developing mammalian neonate. Any perception that milk is a simple, homogeneous fluid does not adequately acknowledge the remarkable array of complex activities and functionalities of its constituent components.

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  • Nevertheless, vitalism continued to find its way into the description of life processes. For instance, Pasteur writing about his discovery of the importance of oxygen availability for sugar fermentation by yeast, to be later known as the Pasteur effect, argued for the exclusive dependency of intact cell structure, a variant of cell theory postulated by Matthias Schleiden, Theodor Schwann, and their predecessors, and “ferments”, a set of biocatalysts represented as vital forces.

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  • The absorption, distribution, metabolism, and excretion of a drug all involve its passage across cell membranes. Mechanisms by which drugs cross membranes and the physicochemical properties of molecules and membranes that influence this transfer are, therefore, important. The determining characteristics of a drug are its molecular size and shape, degree of ionization, relative lipid solubility of its ionized and nonionized forms, and its binding to tissue proteins.

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  • CHAPTER 6 The Effects of Gold on Plants and Animals Lethal and sublethal effects of Au0, Au+, and Au+3 are summarized for aquatic organisms and laboratory mammals. Gold accumulations from solution are documented for microorganisms and other living resources under various physicochemical conditions. 6.1 AQUATIC ORGANISMS This section summarizes lethal and sublethal effects of Au+ and Au+3 on aquatic microorganisms, plants, fishes, and amphibians. 6.1.1 Monovalent Gold Monovalent gold is toxic to aquatic biota at comparatively elevated concentrations of 7.

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  • Selection of chemical markers is crucial for the quality control of herbal medicines, including authentication of genuine species, harvesting the best quality raw materials, evaluation of post- harvesting handling, assessment of intermediates and finished products, and detection of harmful or toxic ingredients. Ideal chemical markers should be the therapeutic components of herbal medicines. However, for most herbal medicines, the therapeutic components have not been fully elucidated or easily monitored.

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  • Titanium oxide ST01, ST31, TiO2 catalysts modified by V5+, N2+ and supported on MCM41 and SiO2 have been used for photooxidation of p-xylene in gas phase. Physicochemical properties of catalysts were determined by the methods of BET Adsorption, Xray Diffraction (XRD), UV-Vis spectroscopy, and atom adsorption spectroscopy (AAS) methods. The photocatalytic activity of catalysts were determined after thermal treatment as well as UV lighting. The common observation is that the higher temperature of treatment the lower conversion of p-xylene obtained.

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  • Encouraged by the friendly acceptance of the first edition and stimulated by numerous requests and comments from the community of meiobenthologists, this second edition updates my monograph on meiobenthology. The revised text emphasizes new discoveries and developments of relevance; it has been extended by adding chapters on meiofauna in areas not covered before, such as the polar regions, mangroves, and hydrothermal vents.

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  • Why do proteins adopt the conformations that they do, and what determines their stabilities? While we have come to some understandingof the forces that underlie protein architecture, a precise, predictive, physicochemical explanation is still elusive. Two obstacles to addressing these questions are the unfathomable vastness of protein sequence space, and the difficulty in makingdirect phy-sical measurements on large numbers of protein variants. Here, we review combinatorial methods that have been applied to problems in protein biophysics over the last 15 years.

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  • Bothrops snake venoms are known to induce local tissue damage suchas hemorrhage andmyonecrosis. Theopossum Didelphis marsupialisis resistant to these snake venoms and has natural venom inhibitors in its plasma. The aim of this work was to clone and study the chemical, physicochemical andbiological properties ofDM64, an antimyotoxic protein from opossum serum. DM64 is an acidic protein showing 15% glycosylation andwith amolecular mass of 63 659 Da when analysed by MALDI-TOF MS.

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  • The Fe-MCM-22 zeolite was successfully synthesized with hexametylenimine template. Several physicochemical techniques (XRD, SEM, BET, AAS, IR and ESR) have been used to characterize this zeolite. Iron exists under three states: Isolated ions in tetrahedral lattice positions, in octahedral coordination as isolated ions at cationic positions and as aggregated oxide species or hydroxide phases.

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  • Batilol (1), 5,8-epidioxycholest-6-en-3-ol (2), and cholesterol (3) were isolated from chloroform extract of the sponge Petrosia nigricans collected in Vietnam. Their structures were determined on the basic of the physicochemical and spectroscopic data. This is the first report of compounds 1, 2 and 3 from this species.

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