نتایج جستجو برای: paleo
تعداد نتایج: 2254 فیلتر نتایج به سال:
The endometrial stromal fibroblast (ESF) is a cell type present in the uterine lining of therian mammals. In the stem lineage of eutherian mammals, ESF acquired the ability to differentiate into decidual cells in order to allow embryo implantation. We call the latter cell type "neo-ESF" in contrast to "paleo-ESF" which is homologous to eutherian ESF but is not able to decidualize. In this study...
ویژگی های محیط طبیعی، مهمترین عامل در جهت شکل گیری سکونت گاه های انسانی خصوصاً در ادوار باستانی می باشد و بهترین راه درجهت پی بردن به ویژگی های طبیعی سکونت گاه های باستانی در زمان برپایی آنها، بررسی های زمین باستان شناسی است. هدف از این پژوهش، بررسی نقش عوامل محیطی در مکان گزینی تپه باستانی چالتاسیان بوده است. این تپه باستانی، در دشت ورامین و در قسمت-های میانی مخروط افکنه جاجرود، واقع شده است. ا...
Stable isotopes are essential tools in biological mass spectrometry. Historically, (18)O-stable isotopes have been extensively used to study the catalytic mechanisms of proteolytic enzymes(1-3). With the advent of mass spectrometry-based proteomics, the enzymatically-catalyzed incorporation of (18)O-atoms from stable isotopically enriched water has become a popular method to quantitatively comp...
The anthropogenic rise in atmospheric CO(2) is driving fundamental and unprecedented changes in the chemistry of the oceans. This has led to changes in the physiology of a wide variety of marine organisms and, consequently, the ecology of the ocean. This review explores recent advances in our understanding of ocean acidification with a particular emphasis on past changes to ocean chemistry and ...
151 T and defects in insulin secretion. Obesity is the major risk factor for the development of the condition and a number of studies— including the Diabetes Prevention Program, the Da Qing IGT and Diabetes Study, and the Finnish Diabetes Prevention Study— have shown that lifestyle modification (diet and exercise) can significantly prevent the progression of glucose intolerance (prediabetes) to...
A central element of the Green Revolution was the widespread adoption of semidwarf rice cultivars (SRCs) that more than doubled worldwide rice production (1). The high-yield potentials of modern SRCs are attributed primarily to their improved harvest index, lodging resistance, and responsiveness to high inputs (primarily nitrogen and water) (1–3), contributing to their adoption in irrigated are...
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