Results 31 to 40 of about 16,521 (164)
Study on the New Method for the Construction of P-N Bond [PDF]
, 2015 磷酰胺酯是一类重要的有机中间体，含有磷酰胺酯结构的化合物具有广泛的生物活性，如抗菌、抗病毒、抗癌活性等。此外，其还可以应用于药物前体和阻燃剂等方面的研究。 早期合成磷酰胺酯最常用的方法是通过胺与磷酰卤反应来实现，但是这种方法不仅反应条件要求苛刻，而且需要前期处理剧毒的磷酰卤化合物。近几十年来，随着研究的不断深入，研究者们终于在合成磷酰胺酯的方法上取得了一系列的突破，但仍存在着一些不足之处。例如，Atherton-Todd法虽操作简便，但使用了计量的剧毒CCl4，在一定程度上又限制了该方法的广泛使用 ...
桑帅
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Lithology modulates soil priming effect via resource limitations and bacterial community structure
Functional Ecology, Volume 40, Issue 1, Page 176-190, January 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The soil priming effect (PE), triggered by root exudate inputs that stimulates microbial activity and drives significant soil carbon (C) losses in terrestrial ecosystems.
Xinyu Hou +4 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2000 本文对棘胸蛙的蝌蚪(体重0.8～2.6g)、小幼蛙(体重9.0～27.3g)、大幼蛙(体重40.5～65.7g)和成蛙(134.5～213.0g)肌肉及蛙皮中的氨基酸及矿物元素的组成进行了分析，结果表明：肌肉中人体必需氨基酸的含量占氨基酸总量的44.06%，谷氨酸的含量很高，为氨基酸总量的15.65%；肌肉中含有20种以上的矿物元素，具有重要生理功能的硒等微量元素含量较丰富，含量为0.029mg/100g。本研究在分析与比较的基础上评价了棘胸蛙的营养价值，为棘胸蛙配合饲料的开发提供理论上的依据。
SHUMiao-an(舒妙安)
doaj +1 more source
Study on Relativity of Polypeptides Sequence and Emulsifying Properties in White Chicken Broth(鸡白汤多肽序列组成与乳化性能相关性研究) [PDF]
Shipin kexue jishu xuebao, 2019 The sequence relativity and emulsifying properties of the polypeptides in traditional Chinese white chicken broth were studied. The white chicken broth stewed for 3 hours was centrifuged and the stable emulsified layer was obtained.
DUAN Nana(段娜娜) +3 more
doaj +1 more source
乌鳢免疫球蛋白M重链和免疫球蛋白轻链的克隆与特征分析 [PDF]
, 2010 应用RACE-PCR方法克隆并鉴定了乌鳢免疫球蛋白M(i mmunoglobulin M,Ig M)重链(H)和免疫球蛋白轻链(L)全长cDNA。乌鳢IgH cDNA全长1 912个核苷酸(nt),包含1 797 nt的开放阅读框,编码598个氨基酸(aa)。IgH恒定区(CH)均包含1对保守的半胱氨酸残基形成链内二硫键,其中CH1区氨基末端存在保守的半胱氨酸残基与轻链形成链间二硫键,4个推测的N-糖基化位点(NXT和NXS)则分别位于CH1、CH2和CH4 ...
周秀霞, 贾伟章
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Integrative Conservation, Volume 4, Issue 4, Page 652-664, December 2025.We profiled nutritional and physiological markers in captive sifakas, endangered primates from Madagascar, managed in expansive, non‐native forest enclosures. Variation in many markers reflects freely foraged diets and the energy required to maintain homeostasis under more naturalistic conditions.
Lydia K. Greene +5 more
wiley +1 more source
Ditylum brightwellii resting spore formation and the changes in intracellular nitrogen status [PDF]
, 2015 有些海洋硅藻在不良的条件下会形成休眠孢子。影响硅藻休眠孢子形成的因素多种多样，其中缺氮是最重要的因素。目前关于硅藻休眠孢子氮营养方面的研究主要集中于外源氮对休眠孢子形成的影响，对休眠孢子形成过程中胞内氮状态的转变并不十分清楚。 本论文以布氏双尾藻（Ditylumbrightwellii,MMDL5153）作为研究对象，在探讨不同氮磷浓度对其休眠孢子形成影响的基础上，以胞内游离氨基酸（FAAs）和谷氨酰胺/谷氨酸（Gln/Glu）比值作为衡量布氏双尾藻胞内氮状态的指标 ...
李朗
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New Phytologist, Volume 247, Issue 2, Page 504-517, July 2025.Summary Repetitive DNA is a feature of all organisms, ranging from archaea and plants to humans. DNA repeats can be seen both in coding and in noncoding regions of the genome. Due to the recurring nature of the sequences, simple DNA repeats tend to be more prone to errors during replication and repair, resulting in variability in their unit length ...
Sridevi Sureshkumar +3 more
wiley +1 more source
S221T/D225Y mutations of Escherichia coli RecA can transfer RecA from cytoplasm to nucleus in HeLa cells [PDF]
, 2016 RecA/Rad51家族蛋白在进化上是非常古老而又保守的蛋白家族。大肠杆菌RecA基因在同源重组、DNA修复、SOS途径、突变和细胞分裂中起重要作用。人Rad51基因是大肠杆菌RecA基因的直向同源基因，两者起源于同一个祖先基因。人Rad51基因主要参与DNA的修复和重组，并且与肿瘤发生关系密切。原核细胞与真核细胞最大的区别在于原核细胞没有以核模为界限的细胞核，而蛋白质的入核转运机制是一个十分复杂的生物学过程，需要核孔复合体（NPC）、核定位信号(NLS)、核转运受体、RanGTP蛋白等共同参与 ...
孙旭利
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Functional Ecology, Volume 39, Issue 5, Page 1274-1287, May 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract Interactions between plants and soil microorganisms in the rhizosphere are vital for maintaining the nutrient cycle and stability of terrestrial ecosystems. Nitrogen, closely related to carbon (C) cycling and ecosystem productivity, undergoes transformation by soil ...
Ru Wang +9 more
wiley +1 more source