نتایج جستجو برای: 22r
تعداد نتایج: 227 فیلتر نتایج به سال:
OBJECTIVE This study was designed to examine the in vitro effects of fenvalerate on steroid production and steroidogenic enzymes mRNA expression level in rat granulosa cells. METHODS Using primary cultured rat granulosa cells (rGCs) as model, fenvalerate of various concentrations (0, 1, 5, 25, 125, 625 micromol/L) was added to the medium for 24 h. In some cases, optimal concentrations of 22(R...
The effect of inhibitors of the cyclo-oxygenase and lipoxygenase pathways of arachidonic acid metabolism on steroidogenesis in rat testis Leydig cells and rat tumour Leydig cells has been investigated. In the presence of nordihydroguaiaretic acid [NDGA; 4,4'-(2,3- dimethylbutan -1,4- diyl )bis[1,2- benzendiol ]], 5,8,11,14-eicosatetraynoic acid (ETYA), BW 755C [3-amino-1-[3-(trifluoromethyl)phe...
Steroid-induced difference spectra have been used to examine the combination of cholesterol with adrenal mitochondrial cytochrome P-450 which participates in cholesterol side chain cleavage (P-450,,,) and the depletion of cholesterol from the cytochrome which results from turnover of the enzyme system. Type I difference spectra induced by cholest5-ene-3fi,25-diol (25-hydroxycholesterol) and cho...
Crude oil samples recovered from three oilfields distributed within the central Niger Delta were used to investigate biological marker fingerprints, sources of organic matter, conditions deposition, and thermal maturation. This was achieved by application gas chromatography-mass spectrometric (GC-MS) analyses on saturated components crude oils. The ratios show low sterane/hopane (steranes/hopan...
در این پژوهش اثر مبرد 22R برسرعت تشکیل هیدرات متان، هنگامی که مخلوطی از گازهای 22R و متان به عنوان فاز گازی هستند، بررسی می شود. افزودن 22R به فاز گازی،سبب افزایش سرعت تشکیل هیدرات متان می شود. آزمایشها در غلظتهای0، 162، 5550، 16000 و 29500 از22R (برحسب ppm) انجام شده ا...
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