搜索结果: 1-15 共查到“理学 Negative”相关记录125条 . 查询时间(0.093 秒)
南京农业大学农学院《Plant Communications》发表国家大豆改良中心盖钧镒院士和许冬清教授团队“The GmSTF1/2-GmBBX4 negative feedback loop acts downstream of blue light photoreceptors to regulate isoflavonoid biosynthesis in soybean”（图）
大豆改良 盖钧镒 许冬清 生物合成
2023/10/28
次生代谢产物异黄酮是一类主要在豆科植物中合成的多酚类物质。异黄酮不仅利于豆科植物应答生物和非生物胁迫、诱导根瘤形成等，而且对人体具有重要的保健和药用价值，比如预防和治疗癌症、心脑血管疾病和骨质疏松等。大豆是工业化生产异黄酮的重要来源，主要含有12种异黄酮物质及其衍生物。根据其化学结构的差异，可将其分为游离型苷元（aglycone）和结合型糖苷（glycoside）两大类，其中结合型糖苷占异黄酮总量...
Negative effect of phytase superdosing in laying hens
Hisex dietary calcium OptiPhos® performance
2018/11/23
Hisex hens, aged 24 weeks, were divided into 6 groups. Each group consisted of 4 cages with 10 hens per cage with dimensions and equipment meeting the EU directives. This 2 × 3 factorial experiment in...
Antibiotic breakthrough:Team discovers how to overcome gram-negative bacterial defenses
Antibiotic breakthrough gram-negative bacterial defenses
2017/7/20
Scientists report that they now know how to build a molecular Trojan horse that can penetrate gram-negative bacteria, solving a problem that for decades has stalled the development of effective new an...
‘Negative mass’ created at Washington State University
Negative mass Washington State University
2017/4/27
Washington State University physicists have created a fluid with negative mass, which is exactly what it sounds like. Push it, and unlike every physical object in the world we know, it doesn’t acceler...
Negative feedback loops help maintain function of mutated proteins
Negative feedback loops maintain function mutated proteins
2016/7/4
Negative feedback is a universal control mechanism that lets a system’s output throttle its input. If an engine revs up, negative feedback tapers its power source. But if the engine slows down, it re-...
Anomalous Negative Fluorescence Anisotropy in Yellow Fluorescent Protein (YFP 10C):Quantitative Analysis of FRET in YFP Dimers
Alzheimer's disease Amyloid beta 40 peptide Human serum albumin Circular dichroism Dissociation constant alpha-Helix
2016/5/25
Yellow fluorescent protein (YFP) is widely used as a genetically encoded fluorescent marker in biology. In the course of a comprehensive study of this protein, we observed an unusual, negative fluores...
We need more randomized trials in nutrition—preferably large, long-term, and with negative results
randomized trials nutritionpreferably large long-term negative result
2018/11/30
The key to optimal nutrition choices has been sought mostly in tens of thousands of observational analyses as well as in expert editorials (like mine) and recommendations. Epidemiology and opinion gro...
Electrified thin films:Global existence of non-negative solutions
Higher order equation Non-local equation Thin film equation Non-negative solutions
2015/10/15
We consider an equation modeling the evolution of a viscous liquid thin film wetting a horizontal solid substrate destabilized by an electric field normal to the substrate. The effects of the electric...
STABLE ERGODICITY FOR PARTIALLY HYPERBOLIC ATTRACTORS WITH NEGATIVE CENTRAL EXPONENTS
PARTIALLY HYPERBOLIC STABLE ERGODICITY
2015/9/29
We establish stable ergodicity of diffeomorphisms with
partially hyperbolic attractors whose Lyapunov exponents along
the central direction are all negative with respect to invariant SRBmeasur...
When Does Non-Negative Matrix Factorization Give a Correct Decomposition into Parts?
Non-Negative Matrix Factorization Parts
2015/8/21
We interpret non-negative matrix factorization geometrically, as the
problem of finding a simplicial cone which contains a cloud of data
points and which is contained in the positive orthant.
Grouping tasks and data display items via the non-negative matrix factorization
Grouping tasks non-negative matrix factorization
2015/8/21
Analyzing work functions and the IO variables they
need is an important component of designing and evaluating
complex systems. We develop a biclustering method for jointly
grouping work functions a...
Innate defense capability of challenged primary bovine mammary epithelial cells after an induced negative energy balance in vivo
pbMEC mastitis energy deficit E. coli
2015/6/23
Negative energy balance (NEB), if followed by metabolic imbalance, is a common problem in
high-yielding dairy cows frequently associated with inflammation of the mammary gland. After entering the
...
The role of cell cycle progression and cyclin -dependent kinase 2 in thymocyte negative selection
T cells and thymus cells thymus self antigen cells
2014/12/11
Autoreactive, immature T cells (thymocytes) are deleted from the thymus during development by the process of negative selection. This mechanism occurs when the thymocyte, T cell receptor (TCR) recogni...
The effect of dominant negative EGR-1 and hyperbaric oxygen on immune cell apoptosis
Induction of cells and multicellular organisms physiology cell death cell research gene regulation
2014/12/11
The ultimate means of limiting the influence of an individual cell on the physiology of a multicellular organism is to induce the death of that cell. Apoptosis is a genetically regulated form of cell ...
Death associated lepidopteran DALP, and its mammalian ortholog Hic-5, act as negative regulators of muscle differentiation
Vertebrates muscle differentiation muscle cells trunk limbs satellite cells cell apoptosis molecular regulation gene
2014/12/11
During muscle differentiation in vertebrates, myoblasts initially form in somites and then migrate to proper locations in the trunk and limbs. Once there, these cells are faced with one of three choic...