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Stranica 1 iz 26 rezultatima
[Pathology of congenital bromine deficit (experimental observation)].
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Pathology of congenital bromine deficiency is described in a she-goat whose mother was kept for two years on a bromine deficient diet. Anomalies of the bones and joints of the anterior limbs, disturbances of carbohydrate, lipid and mineral metabolism in the form of liver, kidney and lymph nodes
Bromine levels in tissue lipids of rats fed brominated fatty acids.
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Rats have been fed diets containing either 0.8% brominated corn oil or 0.5% of the ethyl ester of 9,10-dibromostearate or 9,10,12,13-tetrabromostearate. The brominated compounds were incorporated into semisynthetic diets and animals were observed after feeding periods of 5 days to 3 months. With the
Probing the vibrational dynamics of high-lying electronic states using pump-degenerate four-wave mixing.
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To investigate the vibrational dynamics in high-lying electronic states of molecules, a degenerate four-wave mixing (DFWM) process in combination with an initial pump pulse was employed. Applying this technique, the vibrational dynamics occurring in the high-lying E(0(2)g) ion-pair state of
Relationship between performance deterioration of a polyamide reverse osmosis membrane used in a seawater desalination plant and changes in its physicochemical properties.
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While it is known that the performance of reverse osmosis membranes is dependent on their physicochemical properties, the existing literature studying membranes used in treatment facilities generally focuses on foulant layers or performance changes due to fouling, not on the performance and
Selective probing of vibrational hot states in bromine using time-resolved coherent anti-Stokes Raman scattering.
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In previous work (Scaria, A.; et al. Chem. Phys. Lett. 2009, 470, 39-43) it was shown that the excitation of the electronic B state in bromine can be characterized by transitions starting from vibrational hot states of the electronic ground X state. This contribution is strongly depending on the
[X-ray fluorescent determination of iron, copper, zinc, bromine and rubidium in biopsies of the gastric mucosa].
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A method of a combined use of fiber gastroscopy and x-ray fluorescent analysis was elaborated for a study of the chemical composition of the gastric mucosa. Fr, Cu, Zn, Br, and Rb concentrations were determined in gastric mucosa biopsy specimens obtained during fiber gastroscopy, using x-ray
Understanding the NMR chemical shifts for 6-halopurines: role of structure, solvent and relativistic effects.
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A prototypical study of NMR chemical shifts in biologically relevant heteroaromatic compounds containing a heavy halogen atom is presented for two isomers of halogen-substituted purines. Complete sets of (1)H-, (13)C- and (15)N-NMR chemical shifts are determined experimentally in solution.
Acute spermatogenic effects of bromoacetic acids.
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Chlorine and bromine can react with natural organic substances in source waters to form haloacetic acids, major disinfection by-products of water chlorination. Several toxic effects including testicular damage have been attributed to the chloroacetic acids but little information is available on the
Polybrominated dibenzo-p-dioxins and dibenzofurans: literature review and health assessment.
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Polybrominated dibenzo-p-dioxins (PBDDs) and dibenzofurans (PBDFs) occur as trace (ppb) contaminants in brominated flame retardants and are produced during combustion of these chemicals. They are also formed when organics are incinerated in the presence of bromine, e.g., in municipal and industrial
Comparison of helical scan and standard rotation methods in single-crystal X-ray data collection strategies.
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X-ray radiation in macromolecular crystallography can chemically alter the biological material and deteriorate the integrity of the crystal lattice with concomitant loss of resolution. Typical alterations include decarboxylation of glutamic and aspartic residues, breaking of disulfide bonds and the
The comparative biologic and toxic potencies of polychlorinated biphenyls and polybrominated biphenyls.
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Aroclor 1254 and fireMaster BP-6, two commercial polychlorinated biphenyl (PCB) and polybrominated biphenyl (PBB) preparations, exhibit comparable biologic and toxic effects. In the present study the commercial PBB was more active than Aroclor 1254 in causing thymic atrophy in male Wistar rats.
[ATP-sensitive potassium channel involved in modulation of nitride oxide regulating contractile activity of isolated lymphatics from hemorrhagic shock rats].
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OBJECTIVE
To investigate the mechanism of ATP-sensitive potassium channel (K(ATP)) on nitride oxide (NO) regulating contractile activity of isolated lymphatics from hemorrhagic shock (HS) rats.
METHODS
Eighty - four Wistar rats were randomly divided into control group (n=6), HS 0.5-hour group
Toxic neuropathies: Mechanistic insights based on a chemical perspective.
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2,5-Hexanedione (HD) and acrylamide (ACR) are considered to be prototypical among chemical toxicants that cause central-peripheral axonopathies characterized by distal axon swelling and degeneration. Because the demise of distal regions was assumed to be causally related to the onset of
Toxicology of brominated fatty acids: metabolite concentration and heart and liver changes.
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Rats were fed for 35 days diets containing 2% of either brominated corn oil (BCO), monoglyceride of dibromostearate (DBS), monoglyceride of tetrabromostearate (TBS) or a mixture of the two monoglycerides (BMG) which provided proportions of brominated acids comparable to that of the BCO. Hearts from
Regenerative hyperplasia is not required for liver tumor induction in female B6C3F1 mice exposed to trihalomethanes.
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Chloroform (TCM), a water disinfection by-product, induced liver tumors in female mice when administered by gavage in corn oil but not when given in drinking water at comparable daily doses. Because short-term studies showed that the gavage doses also induced liver toxicity, it has been suggested
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