Results 11 to 20 of about 2,029,186 (129)
, 2004 运用光镜和电镜以及细胞化学方法 ,对中国圆田螺Cipangopaludinachinensis典型精子及其发生的超微结构进行了研究。根据染色质和细胞形态的变化 ,可将其典型精子发生分为五个时期 :精原细胞、初级精母细胞、次级精母细胞、精细胞和成熟精子。精子发生过程中 ,线粒体逐渐增大 ,并随着轴的增生而不断发展为螺旋化线粒体系 ;染色质逐渐凝聚 ,经过颗粒化和纤维化而终呈均质 ;随着染色质的变化 ,细胞核先变小再拉长并螺旋化。精细胞期细胞核基部发生内陷 ,伴随有中心粒的移入 ,并向后方形成&ldquo ...
严云志,谈奇坤,陈士超,储玲
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, 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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Engineering Geometric Active Sites in Cobalt Spinel Oxides for Energy and Environmental Catalysis
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Cobalt‐based spinel oxides (Co3O4 and derivatives) are among the most promising transition metal oxides for electrochemical energy conversion and environmental catalysis due to their abundant active sites, structural tunability, and robust redox flexibility.
Shenning Liu +6 more
wiley +1 more source
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
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Zirconium dioxide (ZrO2) thin films are critical materials owing to their thermal stability, mechanical durability, and optical transparency enabling applications in photonic, sensing, and electronic devices. However, achieving uniform deposition via plasma‐enhanced chemical vapor deposition (PE‐CVD) has remained challenging due to poor ...
Nour Manafikhi +4 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 4, Page 492-499, April 2026.ABSTRACT Objectives To assess the value of placental insufficiency markers for estimating the risk of genetic anomalies in fetuses with isolated early‐onset fetal growth restriction (FGR), defined as an estimated fetal weight ≤ 3rd percentile diagnosed ≤ 28 + 6 weeks' gestation.
M. Armengol‐Alsina +17 more
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Food and Energy Security, Volume 15, Issue 2, March/April 2026.ABSTRACT Net photosynthetic rate (Pn) serves as a key indicator for evaluating plant growth and yield. In order to explore an effective method for monitoring winter rapeseed Pn using unmanned aerial vehicle (UAV) multispectral technology, the winter rapeseed was taken as the research object and the multispectral images were obtained through UAVs in ...
ChengYang Ni +7 more
wiley +1 more source
Integrative Conservation, Volume 5, Issue 1, Page 5-9, March 2026.This study examines the Mawphlang Sacred Forest in Meghalaya as a culturally embedded model of community‐led conservation. Drawing on qualitative fieldwork, it highlights how spiritual reverence, sacred taboos, and ancestral authority shape ecological stewardship, complementing formal governance systems.
Mrinal Saikia
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Laser‐Driven Halide Exchange and High‐Resolution Multicolor Patterning of Perovskite Films
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Translating the excellent properties of metal halide perovskites (MHPs) into practical flexible optoelectronic devices requires high‐resolution multicolor patterning techniques that are compatible with post‐fabrication processing. However, such a capability has remained elusive.
Shu Yang +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Single‐atom catalysis hinges on fundamental challenges in precisely controlling metal‐support interactions and rationally regulating metal–adsorbate relationships. Herein, we report a universal strategy for constructing highly efficient and well‐defined Cu(I) single‐atom catalysts based on a trifurcate AlL3 molecular support.
Donghui Zhang +9 more
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