نتایج جستجو برای: essential element
تعداد نتایج: 550630 فیلتر نتایج به سال:
An element e of a 3-connected matroid M is essential if neither the deletion M\e nor the contraction M/e is 3-connected. Tutte’s Wheels and Whirls Theorem proves that the only 3-connected matroids in which every element is essential are the wheels and whirls. In this paper, we consider those 3-connected matroids that have some non-essential elements, showing that every such matroid M must have ...
RIO1 is an essential gene that encodes a protein serine kinase and is transcribed constitutively at a very low level. Transcriptional activation of RIO1 dispenses with a canonical TATA box as well as with classical transactivators or specific DNA-binding factors. Instead, a dG-dC-rich sequence element, that is located 40 to 48 bp upstream the single site of mRNA initiation, is essential and pre...
Which elements are essential for human life? Here we make an element-by-element journey through the periodic table and attempt to assess whether elements are essential or not, and if they are, whether there is a relevant code for them in the human genome. There are many difficulties such as the human biochemistry of several so-called essential elements is not well understood, and it is not clea...
Zinc, an essential trace element, plays indispensable roles in multiple cellular processes.[...].
Selenium is a fundamental importance to human health. It is an essential trace element for major metabolic pathways, since selenium is an essential component of glutathione peroxidase enzyme. Diet is the main source of selenium. Selenoproteins in mammalian cells indicated that essential role of selenium in the body’s antioxidant defense system.
Background and Aim: This paper reviews the two major concepts in the field of information behavior (IB), namely "information" and "information seeking." Method: Adocumentary research method and review of the literature were used. Results: The word information is the smallest particle and the most essential element in the area of information behavior. The second one is the phrase "information be...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید