نتایج جستجو برای: e20
تعداد نتایج: 360 فیلتر نتایج به سال:
We study a dynamic version of Meltzer and Richard’s median-voter model where agents differ in initial wealth. Taxes are proportional to total income, and they are redistributed as equal lumpsum transfers. Voting takes place every period and each consumer votes for the current tax rate that maximizes his or her welfare. We characterize time-consistent (differentiable) Markovperfect equilibria in...
Provision of the maternal factors, albumin and/or insulin to embryos in vitro restores preimplantation morphological development and cell proliferation to that seen in vivo. The hypothesis that the preimplantation effects of insulin or albumin would be reflected in increased fetal growth rate was examined. Two-cell embryos were cultured 48-50 h in medium supplemented with 0.17 micromol/l, 15 mi...
The aim of the study is to investigate the influence of prenatal temperature stimulation on neuronal NO synthase (nNOS) expression in the anterior hypothalamus of Muscovy duck embryos. Experiments were performed on embryonic day (E) E20, E23, E28, and E33 using histochemistry for identification of the nicotinamide adenine dinucleotide phosphate-diaphorase (NADPH-d) as marker of NOS-containing n...
The methods listed in the title are compared by means of a simulation study and a real world application. The aspects compared in the simulations are: The performance of the tests of the different methods for the dimension of the cointegrating space and the quality of the estimated cointegrating space. It turns out that the subspace algorithm method, formulated in the state space framework and ...
Colonic morphology and function change significantly during ontogenesis. In mammals, many colonic physiological functions are temporally controlled by the circadian clock in the colon, which is entrained by the central circadian clock in the suprachiasmatic nuclei (SCN). The aim of this present study was to ascertain when and how the circadian clock in the colon develops during the perinatal pe...
This research attempts to examine the links between fluctuating oil prices, economic sanctions and the employment in the Libyan economy. In particular, this study attempts to answer the basic question whether UN’s resolutions number 748 (1992) of 31 March 1992 and oil price fluctuations have any significant influence on the employment in Libya. One of this study’s key findings is that fluctuati...
College-educated workers entering the labor market in 1940 experienced a 4-fold increase in their labor earnings between the ages of 25 and 55; in contrast, the increase was 2.6-fold for those entering the market in 1980. For workers without a college education these figures are 3.6-fold and 1.5-fold, respectively. Why are earnings profiles flatter for recent cohorts? We build a parsimonious mo...
Spina bifida aperta are complex congenital malformations resulting from failure of fusion in the spinal neural tube during embryogenesis. Despite surgical repair of the defect, most patients who survive with spina bifida aperta have a multiple system handicap due to neuron deficiency of the defective spinal cord. Tissue engineering has emerged as a novel treatment for replacement of lost tissue...
افزایش آلودگی های زیست محیطی ناشی از به کارگیری سوخت های فسیلی باعث ترغیب پژوهشگران به تحقیق پیرامون سوخت های تجدیدپذیر و پاک شده است. یکی از مهم ترین این سوختها بیواتانول است که در مخلوط با بنزین سوخت مناسبی را تشکیل می دهد. به مخلوط بنزین و بیواتانول در نسبت های پایین گازول گفته می شود. در مقاله حاضر تاثیر گازول که سوختی است پاک بر آلاینده های خروجی اگزوز از قبیل منو اکسید کربن (CO)،...
NO is a free radical that regulates a variety of developmental modulation processes. NO is synthesized by NOS and it acts as a neurotransmitter, neuromodulator or second messenger molecule in the central nervous system. Since NO production may be different before or after birth, the expression of neuronal nitric oxide synthase was examined and analysized during the development of rat optic ...
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