Results 21 to 30 of about 2,645,052 (164)
攀枝花苏铁(Cycas Panzhihuaensis L.Zhou etS.Y.Yang)受精作用及胚胎发生的研究
四川大学学报. 自然科学版, 1999 报道了C .panzhihuaensis的受精作用 ,胚胎发生和分化 .人工授粉 15d后 ,颈卵器开始发育 ,7月底到 8月中旬受精作用发生 ,受精过程有三种情况 :即球形精细胞或蠕虫状精子从卵顶部进入卵细胞内 ,纤毛带遗弃在颈卵器室中 ,或具纤毛带的精细胞进入卵中 ,纤毛带遗弃在卵细胞质内 ,精卵核融合 .胚胎发生经历较长的游离核原胚阶段 ,游离核原胚形成细胞后 ,幼胚开始分化 .受精后的雌配子体发育成胚乳 .成熟的胚由子叶 (二片 )、胚芽、胚根 ...
吴先军, 李平, 黄荣
doaj
, 1996 作者对两性融合生殖鱼和雌核发育银鲫脱膜卵受精的精核发育进行了观察，并采用鱼类卵子无细胞系对以上两类卵质提取物体外诱导经Ｔｒｉｔｏｎ—Ｘ１００处理的精子及其发育进行了初步研究，结果表明在两性融合生殖型脱膜鱼卵中精核通过解凝最终形成原核，而在雌核发育的银鲫脱膜卵子中部分精核体积虽有一定程度的增加，但始终没有观察到原核的发育；在体外诱导实验中，经Ｔｒｉｔｏｎ—Ｘ１００处理的精子在两类卵质提取物中充分发育，都出现了类似体内原核的状态。该现象提示在银鲫卵质中存在有促使精核形成原核的因子 ...
岳振宇,蒋一,单仕新,丁军
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甲壳动物精子学研究概况Ⅱ.精子发生与精子的生化组成 [PDF]
, 1998 甲壳动物精子学研究概况Ⅱ.精子发生与精子的生化组成王艺磊1，2）张子平3）李少菁2）（集美大学水产学院养殖系1）厦门361021）（厦门大学海洋学系2）厦门361005）（香港城市大学生物与化学系3）九龙香港）关键词甲壳动物精子发生生化组成在前文阐...福建省自然科学基金 ...
李少菁, 张子平, 王艺磊
core
Zhongguo shiyan zhenduanxue, 2006 目的筛选与精子发生相关的基因。方法将不同发育阶段的小鼠睾丸组织cDNA探针与Affymetrix全基因组芯片进行杂交,通过杂交信号的比较,筛选出差异表达的基因。利用网络信息资源对该基因进行生物学信息分析。RT-PCR分析该基因在小鼠不同发育阶段睾丸及小鼠不同组织中的表达。结果通过4、91、8、35、54、日龄和6月龄小鼠睾丸的芯片信号比较筛选出一个差异表达杂交点（GenBank登录号:NM-026234）,生物信息学分析发现该基因全长3 979 bp,含有1 272 bp的完整ORF ...
唐爱发 +7 more
doaj
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT The escalating severity of global environmental pollution necessitates the development of sustainable and efficient adsorption materials. Nanocellulose (NC), sourced from the most abundant natural polymer on earth, has shown great potential in this field due to its renewability, biodegradability, and exceptional nanoscale properties.
Yaqian Yu +5 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2011 目的筛选与弱精子症发生相关的基因。方法采集正常男性和弱精患者精液精子,非连续梯度离心法分离纯化精子,收集95%percoll以下和57%与76%Percoll层之间的精子,以排除生精细胞和白细胞的污染。将纯化后精子的cDNA探针与Affymetrix全基因组芯片杂交。筛选出差异表达的基因,利用生物信息学方法对该基因进行分析。用RT-PCR验证该基因在正常男性和弱精患者精液精子中的差异表达,并用RT-PCR方法分析该基因在人不同组织（心、肝、脾、肺、肾、胃、脑、睾丸）中的表达。结果分析芯片杂交结果 ...
李如凯, 郭龙华
doaj
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Due to their exceptional porosity, structural versatility, and modular coordination chemistry, metal–organic frameworks (MOFs) have emerged as versatile platforms for targeted drug delivery. These structures enable fine‐tuning of pore size, surface activity, and framework stability for the encapsulation of a broad range of therapeutics ...
Rui Hua +9 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2008 目的探讨精液生精细胞检查对无精症诊断的应用价值及临床意义。方法分析81例无精子症患者精液生精细胞学检查结果,与睾丸穿刺活检结果对照分析。结果精液生精细胞学检查对梗阻性和非梗阻性无精症分型诊断的符合率分别为85%、95.1%。41例非梗阻性无精症中,生精阻滞阶段在精子细胞、精母细胞、精原细胞分别为14例2、1例和6例。对同一患者精液细胞学检查与睾丸穿刺活检一致性分析中,生精细胞发育程度一致 ...
谷振环 +5 more
doaj
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Advanced metallic glasses, leveraging their ultrahigh strength, excellent corrosion resistance, superior soft magnetic properties and good biocompatibility, have gradually become indispensable strategic cornerstones in critical fields such as aerospace, electronic information and energy power. This unique combination of properties enables them
Yizhou Liu +11 more
wiley +1 more source
Metal‐Based Materials for Redox Modulation in Biomedicine
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Metal materials have become increasingly important in modulating biological redox networks for therapeutic and diagnostic purposes, owing to their distinctive electronic properties and adaptable reactivity. This review synthesizes recent developments across various metal‐based materials, including elemental metals, metal oxides, coordination ...
Yan Fan +7 more
wiley +1 more source