نتایج جستجو برای: c19

تعداد نتایج: 531  

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده مهندسی عمران 1391

در این تحقیق بتن‏های خود تراکم با مقادیر متفاوت سیمان ، پودر سنگ آهکی و با دو دانه بندی c19 و c9.5 ساخته و پارامترهای رئولوژی و خواص مکانیکی نمونه‏ها بررسی شدند. بر این اساس نمونه هایی با پودر سنگ آهک با مقادیر مختلف حجم ماتریس خمیر ازlit/m3 290 تا lit/m3410 ساخته شدند. نتایج نشان می دهد بتن هایی که حاوی ماتریس خمیر به مقدار lit/m3330 بودند، از نظر پارامتر های رئولوژی مانند اسلامپ جاری بهترین ن...

Journal: :Progress in neurobiology 2003
Luis M Garcia-Segura Sergio Veiga Amanda Sierra Roberto C Melcangi Iñigo Azcoitia

Estradiol, in addition to its participation in neuroendocrine regulation and sexual behavior, has neuroprotective properties. Different types of brain injury induce the expression of the enzyme aromatase in reactive astroglia. This enzyme catalyzes the conversion of testosterone and other C19 steroids to estradiol. Genetic or pharmacological inhibition of brain aromatase results in marked neuro...

Journal: :European journal of clinical chemistry and clinical biochemistry : journal of the Forum of European Clinical Chemistry Societies 1997
L Stárka R Hampl M Hill O Lapcík R Bílek R Petrik

Epitestosterone, a C19-steroid with anti-androgenic activity, was determined in the plasma of 234 boys and men from the ages of 6-86 years, and in the prostate tissue of 15 men 55-82 years of age. It was documented that, while in adulthood the concentration of epitestosterone is about ten times lower than the concentration of testosterone, in the pre-pubertal period the level of epitestosterone...

2004
Gabriel Kuhn

We derive analytic expressions for the tail behavior of credit losses in a large homogeneous credit default portfolio. Our model is an extended CreditMetrics model; i.e. it is a one-factor model with a multiplicative shock-variable. We show that the first order tail behavior is robust with respect to this shockvariable. In a simulation study we compare different models for the latent variables....

Journal: :Cancer research 1996
Y C Kao L L Cam C A Laughton D Zhou S Chen

Aromatase, a cytochrome P450, catalyzes three consecutive hydroxylation reactions converting C19 androgens to aromatic C18 estrogenic steroids. In this study, eight human aromatase mutants (I133Y, I133W, F235L, I395F, I474Y, I474W, I474M, and I474N) were prepared to evaluate the active site and a proposed hydrophobic pocket of the enzyme that exists in an aromatase model based on the X-ray stru...

2007
Y. KAI

Methyl sterculate was rearranged by use of 0.5% of rhodium catalyst to isomeric conjugated diene fatty acid methyl esters containing both methyleneand methyl-branched isomers. The rearranged products were hydrogenated directly to saturated, methyl-substituted, branched-chain fatty acid methyl esters with the methyl substituent at one of the positions formerly occupied by the cyclopropenoid ring...

Journal: :Journal of environmental sciences 2016
Hairong Zhang Jingchun Tang Lin Wang Juncheng Liu Ranjit Gajanan Gurav Kejing Sun

The present work aimed to develop a novel strategy to bioremediate the petroleum hydrocarbon contaminants in the environment. Salt tolerant bacterium was isolated from Dagang oilfield, China and identified as Corynebacterium variabile HRJ4 based on 16S rRNA gene sequence analysis. The bacterium had a high salt tolerant capability and biochar was developed as carrier for the bacterium. The bacte...

Journal: :Molecular and cellular endocrinology 2017
Elzette Pretorius Wiebke Arlt Karl-Heinz Storbeck

The abundant adrenal C19 steroid 11β-hydroxyandrostenedione (11OHA4) has been written off as a dead-end product of adrenal steroidogenesis. However, recent evidence has demonstrated that 11OHA4 is the precursor to the potent androgenic 11-oxygenated steroids, 11-ketotestosterone and 11-ketodihydrotestosterone, that bind and activate the human androgen receptor similarly to testosterone and DHT....

2011
Jian-Ying Huang Fengyan Zhou

The title compound, C(26)H(23)F(2)NO(3), was synthesized by the reaction of 2-(4-fluoro-benzyl-idene)-4-methyl-3-oxo-N-phenyl-penta-namide and 4-fluoro-benzaldehyde. The dihedral angles between the mean plane through the pyrrolidine ring (nearly planar; maximum deviation of 0.145 Å for the C atom bearing the hydroxy group) with the phenyl and benzene rings are 37.22 (7), 51.88 (7) and 87.64 (9)...

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