acetylene/hypoxia

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Acetylene hydrogenation on anatase TiO2(101) supported Pd4 cluster: oxygen deficiency effect.

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Acetylene hydrogenation on both the perfect and oxygen defective anatase TiO(2)(101) surfaces supported Pd(4) cluster has been studied using density functional theory calculations with a Hubbard U correction (DFT + U). The adsorbed Pd(4) cluster on the perfect surface prefers to form a tetrahedral

Acetylene, a mammalian metabolite of 1,1,1-trichloroethane.

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1,1,1-Trichloroethane (TCE) is a widely used industrial solvent of low acute toxicity. It is slowly oxidized to trichloroethanol and trichloroacetic acid by cytochrome P-450-dependent mono-oxygenases. Increased inhalative uptake by rats under hypoxia and spin-trapping experiments indicate that TCE

[A case of acute eosinophilic pneumonia induced by inhalation of acetylene].

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A 17-year-old high school student, while carrying out soldering one morning, inhaled 100% acetylene, and experienced nausea and bilateral lower limb numbness several hours later. In the evening his symptoms worsened, dyspnea followed, and the patient was referred to our hospital the next day. On

[Effect of hypoxia and hyperthermia on the processes of lipid peroxidation in the rat liver against a background of the action of gutimine and unsaturated amines].

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Following the action of extraordinary stimulants (hypoxic hypoxia, hypoxia+hyperoxia, hypodynamia+hyperthermy) animals demonstrate accumulation of malonic dialdehyde with a simultaneous fall of antiradical activity of the liver tissue. A preliminary introduction to rats of acetylene amines--1,4 bis

Preparation of alkyne-labeled 2-nitroimidazoles for identification of tumor hypoxia by Raman spectroscopy.

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Hypoxia is a characteristic feature of solid tumors. Herein, we have developed novel hypoxia-sensitive probes (IM-ACs) for Raman spectroscopic analysis, consisting of nitroimidazole as a hypoxia-targeting unit and acetylene group as the signal-emitting unit. Among IM-ACs synthesized in this study,

Lung diffusing capacity and exercise in subjects with previous high altitude pulmonary oedema.

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Subjects with a history of high-altitude pulmonary oedema (HAPE) have increased pulmonary artery pressure and more ventilation-perfusion (V'A/Q') inhomogeneity with hypoxia and exercise. We used noninvasive methods to determine whether there are differences in the pulmonary diffusing capacity for

Beta-adrenergic or parasympathetic inhibition, heart rate and cardiac output during normoxic and acute hypoxic exercise in humans.

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Acute hypoxia increases heart rate (HR) and cardiac output (Qt) at a given oxygen consumption (VO2) during submaximal exercise. It is widely believed that the underlying mechanism involves increased sympathetic activation and circulating catecholamines acting on cardiac beta receptors. Recent

Denitrification in cypress swamp within the Atchafalaya River Basin, Louisiana.

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Nitrogen has been implicated as a major cause of hypoxia in shallow water along the Louisiana/Texas, USA coasts. Excess nitrogen (mainly nitrate) from Mississippi and Atchafalaya River drainage basins may drive the onset and duration of hypoxia in the northern Gulf of Mexico. Restoring and enhancing

A method of analysis of the pulmonary gas exchange system.

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This method of system analysis is based on O2 and CO2 concentration curves obtained simultaneously from expired air during constant flow expiration. First, theoretical equations for alveolar O2 and CO2 curves were derived by using a simple gas exchange model. By substituting them with the measured

The Green Berry Consortia of the Sippewissett Salt Marsh: Millimeter-Sized Aggregates of Diazotrophic Unicellular Cyanobacteria.

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Microbial interactions driving key biogeochemical fluxes often occur within multispecies consortia that form spatially heterogeneous microenvironments. Here, we describe the "green berry" consortia of the Sippewissett salt marsh (Falmouth, MA, United States): millimeter-sized aggregates dominated by

Influence of work rate on dynamics of O2 uptake under hypoxic conditions in humans.

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OBJECTIVE It was the purpose of the investigation to determine whether an altered work rate could influence the oxygen uptake (V.O(2)) and heart rate (HR) dynamics at hypoxia and normoxia. METHODS Ten males performed a cycle exercise with 2 repetitions of 6 min each at a constant work load while

Calcium carbide poisoning via food in childhood.

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The fast ripening of fruits means they may contain various harmful properties. A commonly used agent in the ripening process is calcium carbide, a material most commonly used for welding purposes. Calcium carbide treatment of food is extremely hazardous because it contains traces of arsenic and

A class 1 hemoglobin gene from Alnus firma functions in symbiotic and nonsymbiotic tissues to detoxify nitric oxide.

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Actinorhizal symbiosis is as important in biological nitrogen fixation as legume-rhizobium symbiosis in the global nitrogen cycle. To understand the function of hemoglobin (Hb) in actinorhizal symbiosis, we characterized a Hb of Alnus firma, AfHb1. A cDNA that encodes nonsymbiotic Hb (nonsym-Hb) was

Core-shell structured upconversion nanocrystal-dendrimer composite as a carrier for mitochondria targeting and catalase enhanced anti-cancer photodynamic therapy.

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Recently, photodynamic therapy (PDT) has been deemed to be the most promising strategy for cancer treatment. To improve the efficacy for PDT, nanocarriers are expected to target mitochondria that are vulnerable to toxic reactive oxygen species (ROS). Moreover, overcoming tumor hypoxia is also

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