Results 71 to 80 of about 182,229 (193)
, 1996 ＲＮＡ剪接和剪接调控桂建芳（中国科学院水生生物研究所武汉４３００７２）基因是遗传的功能单位，蛋白是由基因表达的行使生理功能的主体。７０年代以前，人们对基因和蛋白的了解主要是来自于对细菌研究的认识，认为基因、ｍＲＮＡ和蛋白之间是一种线性关系，即基因上的..
桂建芳
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Unveiling Entropy‐Driven Hard‐Tough Synergy Mechanisms in High‐Entropy Carbonitride Ceramics
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT High‐entropy ceramics manifested promise for extreme environments, yet their phase stability and mechanical synergy mechanisms remain elusive. Herein, entropy‐difference carbonitrides, including (TaTiV)CN, (TaTiVNb)CN, and (TaTiVNbHf)CN, were designed and consolidated via spark plasma sintering.
Long Zhao +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2011 在保护地菜田条件下,以水果苤蓝为供试作物,研究优化施肥、C/N调控、种植填闲作物等3种不同措施对土壤硝态氮累积与淋溶的影响。结果表明,种植当季,优化施肥和C/N调控处理均可有效阻控硝态氮淋溶。综合考虑水果苤蓝生长期和填闲/休闲期,3种措施阻控硝态氮淋溶的强度,由强到弱依次为:种植填闲作物>优化施肥>C/N调控。建议控制施肥量的同时,采用合理的管理方式,多方面阻控硝态氮的累积与淋溶,保护环境安全。
吴雪玲 +4 more
doaj
, 2014 本实用新型提供一种二维跟踪转台电控系统数据在线调试系统，解决了现有技术采取RS-232或RS-422速度传输缓慢、通讯查找能力有限、不能热插拔的问题。该系统包括内嵌有第三USB接口的微型控制器和计算机，微型控制器的数字或者模拟接口与二维跟踪转台连接，微型控制器的第三USB接口与计算机的第一USB接口通过USB数据线连接，微型控制器的JTAG接口与计算机的第二USB接口通过调试器连接。微型控制器采集二维跟踪转台产生的目标状态信息并通过自身的USB接口将目标状态信息传至计算机上；本实用新型安全、便携 ...
王鲜红, 马彩文, 梁雁冰
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Platinum‐based electrocatalysts are fundamentally constrained by strong oxygen binding, which restricts the oxygen reduction reaction (ORR) kinetics, and by severe CO poisoning, which hinders the methanol oxidation reaction (MOR). To address these limitations, we synthesized PdPtRuIrRhNi high‐entropy alloy (HEA) mesoporous nanotubes that ...
Hong Pan +6 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2016 摘 要： 【目的】 探讨ｍｉＲＮＡ－２１转录调控因子ＡＰ－１、ＳＴＡＴ３、ＮＦＩ１、ＣＢＰ、ＥＢＰ、ＴＧＦ－β、ＢＭＰ－６、ＧＦＩ１的结构特征及其与ｍｉＲＮＡ－２１转录结合位点。【方法】 利用生物信息学工具分析ｍｉＲＮＡ－２１转录调控因子的理化性质、三级结构、跨膜区、信号肽、亚细胞定位及预测与ｍｉＲＮＡ－２１转录结合位点。【结果】 等电点分析表明ＳＴＡＴ３等电点小于７．０，其余７个转录调控因子等电点大于７．０；脂溶指数分析显示，ＥＢＰ脂溶指数大于１００，为亲水性蛋白 ...
doaj
, 2007 研究了不同调控措施下辽东栎灌丛再萌生株各生长因子的特征,分析了不同的人为调控措施对辽东栎次生灌丛再萌生能力的影响.结果表明,人为调控对辽东栎再萌生株的发生与生长有着重大影响.调控强度大,再萌生株的数量、高度较小,基径、单株生物量较大;调控强度小,再萌生株的数量、高度较大,基径、单株生物量较小.在辽东栎种群的更新过程中,幼苗与幼树间存在着明显的瓶颈现象,经过激烈的竞争生长,只有少数才能进入下一个生长季.生长季前清除所有再萌生株后,由于当年生长季调控措施的不同,再萌生能力出现差异.调控后 ...
庞学勇, 孙凡, 孟令彬, 包维楷
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT An ultra‐high as‐deposited tensile strength of 1408 MPa—the highest reported value for laser‐directed energy deposition (L‐DED) fabricated Ti2AlNb alloy—is achieved in this study. The as‐deposited microstructure consists of coarse B2 grains with a high density of fine acicular O phase precipitates within the grains, along with a brittle α2 ...
Ximiao He +7 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2013 基因调节是一个连续而复杂的过程,正常细胞中的基因通过多途径、多步调节的网络来控制细胞生长、发育和细胞凋亡,也是细胞分化和肿瘤生成等生物现象的深层原因。基因调控网络是连续的多层次动力系统模型,具有稳定性、层次性、复杂性、动态性等特性[1],按照调控元件、motif ...
曹林林 +5 more
doaj
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Ti‐15Mo‐2.5Ag alloy exhibited a low modulus and strong antibacterial ability but poor bioactivity. To resolve this problem, sandblasting and anodization were used to create a hydrophilic and nano‐Ag2O‐containing TiO2 coating. Subsequently, the microstructure and physicochemical properties were investigated by scanning electron microscopy, X ...
Yanchun Xie +11 more
wiley +1 more source