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15 резултата
Clinical and pathological effects of short-term cyanide repeated dosing to goats.
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The purpose of this work is to determine and describe the effects of subacute cyanide toxicity to goats. Eight female goats were divided into two groups. The first group of five animals was treated with 8.0 mg KCN kg(-1) body weight day(-1) for seven consecutive days. The second group of three
Hyperthermia, Na+K+ATPase and lactic acid production in some human tumour cells.
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When HeLa cells are exposed to brief heat shock at 45 degrees C there is a reduction in the cellular level of Na+K+ATPase. Return of the cells to the normal growth temperature of 37 degrees C leads to a partial restoration of enzyme activity. The pattern of this recovery of activity suggests that it
Membrane conductances of principal cells in Malpighian tubules of Aedes aegypti.
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Two-electrode voltage clamp (TEVC) methods were used to explore conductive transport pathways in principal cells, the dominant cell type in Malpighian tubules of the yellow fever mosquito. The basolateral membrane of principal cells had a voltage (V(bl)) of -85.1 mV in 49 principal cells under
The dependence of electrical transport pathways in Malpighian tubules on ATP.
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The relationship between the intracellular ATP concentration [ATP](i) and the electrical properties of principal cells was investigated in Malpighian tubules of the yellow fever mosquito, Aedes aegypti. Under control conditions, [ATP](i) was 0.91 mmol l(-1), the input resistance of the principal
Induction of thermotolerance and heat shock protein synthesis in normal and respiration-deficient chick embryo fibroblasts.
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Normal and transformed chick embryo cells and their respective ethidium bromide-treated derivatives that are devoid of a functional respiratory chain were comparatively evaluated for their responses to hyperthermia treatment. No significant difference was found between the control and the
Voltage clamping single cells in intact malpighian tubules of mosquitoes.
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Principal cells of the Malpighian tubule of the yellow fever mosquito were studied with the methods of two-electrode voltage clamp (TEVC). Intracellular voltage (V(pc)) was -86.7 mV, and input resistance (R(pc)) was 388.5 kOmega (n = 49 cells). In six cells, Ba(2+) (15 mM) had negligible effects on
Synthesis and antiviral activity of certain 9-beta-D-ribofuranosylpurine-6-carboxamides.
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To examine the structural parameters necessary for antiviral efficacy of certain purine nucleosides, several 9-beta-D-ribofuranosylpurine-6-carboxamides have been synthesized. Glycosylation of the Me3Si derivative of purine--6-carboxamide with protected ribofuranose in the presence of a Lewis acid
Uncoupling of oxidative phosphorylation does not induce thermotolerance in cultured Chinese hamster cells.
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Two uncouplers of oxidative phosphorylation, 2,4-dinitrophenol (DNP) and carbonyl cyanide m-chlorophenylhydrazone (CCCP), were tested for their ability to modify the survival of cultured Chinese hamster ovary (CHO) and Chinese hamster V79 cells treated with hyperthermia. The uncouplers were used
Effects and biotransformation of 4-dimethylaminophenol in man and dog.
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The cyanide antidote 4-dimethylaminophenol . HCl (DMAP) was administered orally, i.v., or i.m. to man and dog. Ferrihemoglobin formation and changes of several parameters in human blood were investigated to obtain information on damage to liver, kidney, muscle, and red blood cells; in addition, the
Nutritive value and haemolytic properties (in vitro) of the leaves of Vernonia amygdalina on human erythrocyte.
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BACKGROUND
Vernonia amygdalina (Bitter leaf) is popularly consumed in many homes in Nigeria as a vegetable in soup preparation, while the infusion is used in folk medicine in the treatment of malaria fever. In this study, fresh leaves of Vernonia amygdalina were subjected to abrasion (to remove the
Regulation of the synthesis of superoxide dismutases in rat lungs during oxidant and hyperthermic stresses.
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Heat shock proteins are induced at normal temperatures by oxidants and during reoxygenation following hypoxia. We now report cyanide-resistant O2 consumption increased 30-50% in rat lungs exposed to heat shock or reoxygenation following hypoxia. The synthesis of Cu,Zn superoxide dismutase, but not
Thermosensitivity of the membrane potential of normal and simian virus 40-transformed hamster lymphocytes.
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The effects of temperature in the fever range (37-42 degrees) on the membrane potentials of normal and simian virus 40-transformed hamster lymphocytes were analyzed. The transmembrane distributions of radiolabeled triphenylmethylphosphonium and thiocyanate were measured, and they provide upper and
Microbiological, biological, and chemical weapons of warfare and terrorism.
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Microbiological, biological, and chemical toxins have been employed in warfare and in terrorist attacks. In this era, it is imperative that health care providers are familiar with illnesses caused by these agents. Botulinum toxin produces a descending flaccid paralysis. Staphylococcal enterotoxin B
A convenient first aid kit for chemical and biological agents and for radiation exposure.
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The chemical and biological warfare agents are extremely toxic in nature. They act rapidly even in very small quantities and death may occur in minutes. Hence, physical and medical protection must be provided immediately to save life or avoid serious injury. A first aid kit has thus been developed
Respiratory hydrogen use by Salmonella enterica serovar Typhimurium is essential for virulence.
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Based on available annotated gene sequence information, the enteric pathogen salmonella, like other enteric bacteria, contains three putative membrane-associated H2-using hydrogenase enzymes. These enzymes split molecular H2, releasing low-potential electrons that are used to reduce quinone or
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