نتایج جستجو برای: total nitrite
تعداد نتایج: 809916 فیلتر نتایج به سال:
2 Abstract Nitrite in/on the skin has potent antimicrobial effects and is believed to act as a local nitric oxide (NO) reservoir capable of modulating dermal cell function. Using male Wistar rats we here show that nitrite, when applied in neutral aqueous solution to the skin surface, readily permeates the dermis to reach the systemic circulation and cause widespread nitros(yl)ation of tissue pr...
INTRODUCTION The efficacy of nebulized sodium nitrite (AIR001) has been demonstrated in animal models of pulmonary arterial hypertension (PAH), but it was not known if inhaled nitrite would be well tolerated in human subjects at exposure levels associated with efficacy in these models. METHODS Inhaled nebulized sodium nitrite was assessed in three independent studies in a total of 82 healthy ...
Formation of N-nitroso compounds in gastric juice has been implicated in the pathogenesis of cancer in the stomach after operation. Gastric juice was aspirated from 85 subjects: 23 were controls, 51 had previously undergone vagotomy and gastrojejunostomy, and 11 had previously undergone vagotomy and pyloroplasty. The gastric juice samples were analysed for pH, nitrite, and total N-nitroso compo...
Chlorella vulgaris was grown using mixed sources of nitrogen (nitrate and nitrite). Starting from B3N as basal medium, nitrate substituted by nitrite keeping total constant over 7 conditions: 0, 20, 40, 50, 60, 80 100% NO2–. Growth rate, uptake, photosynthetic apparatus status pigment contents were monitored. Nitrite addition triggered a growth rate inhibition early introduction (20% NO2–, 81 m...
Background and objectives: Nitrate and nitrite threaten the human health. According to recent research works, one of the great sources of exposure to nitrate and nitrite in human diet is vegetables. The aim of this study is to determine the effect of drying and frying processes on nitrate and nitrite levels in abundant vegetables. Materials and methods: In this descriptive – analytical study, 1...
Backgrounds and Objectives : Nitrogen compounds in wastewater are mainly in four types of organic, am- monia, nitrite and nitrate. Total nitrogen concentration in municipal wastewater is usually within 25 to 45 mg/L as nitrogen. The most important problem with nitrogen is its oxygen demand and human health effect.Materials and Methods: Anaerobic Baffled Reactor (ABR) is a system in which baffle...
1. Enzyme systems from Cucurbita pepo have been shown to catalyse the reduction of nitrite and hydroxylamine to ammonia in yields about 90-100%. 2. Reduced benzyl viologen serves as an efficient electron donor for both systems. Activity of the nitrite-reductase system is directly related to degree of dye reduction when expressed in terms of the function for oxidation-reduction potentials, but a...
Nitrite and nitrate are main stable products of nitric oxide, a pivotal cellular signaling molecule, in biological fluids. Therefore, accurate measurement of the two ions is profoundly important. Nitrite is difficult to be determined for a larger number of interferences and unstable in the presence of oxygen. In this paper, a simple, cost-effective and accurate HPLC method for the determination...
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