Results 121 to 130 of about 2,098,135 (238)
New Phytologist, EarlyView.Polyphenol oxidases (PPOs) depletion preserves endogenous proteins at their predicted molecular weights and enhances detectable enzymatic activities. (a) Less RbcL crosslinking in ppo mutant of Nicotiana benthamiana. Leaf extracts were incubated for 1 h, separated on protein gels, stained with Coomassie or analyzed by Western blot with the anti‐RbcL ...
Kaijie Zheng +4 more
wiley +1 more source
Gongye shui chuli, 2004 通过试验探讨了二步法腈纶废水进行好氧活性污泥生化处理及各种强化措施的性能,研究表明单纯的活性污泥法难以实现腈纶废水达标排放,Fenton试剂与O3氧化及厌氧酸化作为好氧生化前处理手段对于提高腈纶废水可生化性作用较小,富营养物添加及生活污水共基质条件也不能增强生化处理时难降解COD部分的去除率,腈纶生化处理后废水有必要增加物理化学方法实现达标外排。
赵朝成 +3 more
doaj
, 1995 一种可制纯氮、氧气体的电化学发生器，是利用恒定电位电解法，控制电压≤１．５Ｖ直流电。它采用微孔膜，例如石棉膜作为两电极的分隔板，多孔气体扩散型氧电极为阴极，镍网为阳极，且电极安装是采用硬支撑结构。该发生器可在氮、氧气室压差（１ＭＰａ)下稳定工作，可避免阴极氢析出，保证产生气体的纯度氮、氧都可达到９９．９９％，此外，该设备结构简单，造价低，不但可装成小型气体发生器，也可组装成工业生产用大型纯氮、氧体制备装置 ...
张恩俊 +4 more
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New Phytologist, EarlyView.Biosynthesis and accumulation of tanshinones in the periderm of Salvia miltiorrhiza during secondary root growth. Summary Perennial herbs develop long‐lived roots that undergo repeated cycles of secondary growth, during which the periderm functions as a protective barrier and a major site of specialized metabolite accumulation.
Licheng Liu +19 more
wiley +1 more source
, 2005 一种抗生素手性色谱固定相，其特征在于：所述色谱固定相是将糖肽类大环抗生素—游臂菌素作为手性选择剂，化学键合在载体上制成。本发明可以在常用的反相流动相条件下，实现直接、简单、快速的药物西孟旦对映体的拆分 ...
于亿年, 王俊德, 刘莺, 丁国生
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Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, EarlyView.ABSTRACT Research on policy reinvention, where a government modifies rather than replicates policy innovations introduced by other governments, has progressed significantly, but how it is influenced by the government's issue attention has not been thoroughly examined.
Yingxin Zhang, Yixue Yao, Kaifeng Yang
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2015 乳腺癌是临床常见女性恶性肿瘤,是导致女性肿瘤患者死亡的重要疾病[1],且发病率呈增长趋势,年龄呈年轻化趋势[2],本病的发病机制比较复杂,发病原因也较多,表皮生长因子受体和血管内皮生长因子的过度表达可能为乳腺癌发病和转移的重要分子生物学基础[3-4]。表皮生长因子受体（EGFR）是正常细胞生长、分化和存活的重要调节因子,但当其过度表达时则可能发生肿瘤,EGFR水平高低与疾病的发生、发展 ...
王春艳
doaj
, 2003 地木耳为一种耐干旱的陆生念珠藻 ,葛仙米则是水生念珠藻 ,由于对各自生境的适应 ,二者在对盐胁迫的反应上可能会有差异。为了阐明这种差异 ,研究了不同盐度胁迫下它们的光合活性、可溶性糖、脯氨酸含量及质膜透性的变化。结果表明 ,高盐胁迫下地木耳和葛仙米的光合活性均降低 ;在 0 .8mol·L- 1 的盐浓度下胁迫 48和 96h后 ,地木耳仍可检测到微弱的光合活性 ,而在葛仙米中已检测不到。地木耳中脯氨酸升高 ;可溶性糖含量升高 ,增幅为87%— 2 0 0 ...
李运广,高坤山
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Facets of Crises: How Problem Indicators and Public Perceptions Affect Policy Change
Policy Studies Journal, EarlyView.ABSTRACT Crises are widely acknowledged as catalysts for policy change. Yet, our understanding of the policy effects of crises remains limited. Why do only some crises lead to major changes, while significant policy changes also occur during seemingly non‐crisis periods?
Constantin Kaplaner +6 more
wiley +1 more source
, 2006 随着化石燃料的短缺和环境问题的加剧，生物质作为一种清洁的可再生能源日益受到全世界的关注和重视，由生物质制备合成气进而合成液体燃料也成为众多学者关注的热点。目前，生物质气化和费托合成都已具有工业生产装置和成熟的生产工艺，生物质合成燃料的关键技术在于两段技术的匹配和集成，即生物质合成气的制备。 制备生物质合成气的气化粗燃气中的焦炭和焦油不仅堵塞送气管道，使气化设备的运行发生困难，甚至能引起催化剂的严重失活，目前已成为燃气高品位利用的瓶颈，特别是在液体燃料合成领域 ...
崔小勤
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