Results 1 to 10 of about 7,402 (142)
Ultrastructure of spermatozoon of Turbo cornutus Solander(角蝾螺精子的超微结构)
Zhejiang Daxue xuebao. Lixue ban, 2005 用透射电镜(TEM)技术研究了角蝾螺精子的超微结构.成熟精子包括头部和尾部.头部由啤酒瓶状顶体与柱状细胞核构成.顶体内含物分布均匀，电子密度稍低于细胞核；顶体下腔呈细长管状，基部扩大成喇叭形，内有颗粒状物质分布.细胞核物质致密，电子密度高；核的前、后端都有一V字形凹陷，分别为核前窝和核后窝，尾部包括中段和末段.中段由5个线粒体围绕近、远端中心粒构成；末段细长鞭状，由中央轴丝及外包的质膜组成，轴丝为典型的“9+2 ”结构.比较了角蝾螺精子与相关腹足类精子结构的异同，分析了角蝾螺精子在腹足类系统演化中的地位.
ZHUJun-quan(竺俊全) +1 more
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Using vertebrate environmental DNA from seawater in biomonitoring of marine habitats
Conservation Biology, Volume 34, Issue 3, Page 697-710, June 2020., 2020 Abstract Conservation and management of marine biodiversity depends on biomonitoring of marine habitats, but current approaches are resource‐intensive and require different approaches for different organisms. Environmental DNA (eDNA) extracted from water samples is an efficient and versatile approach to detecting aquatic animals.
Eva Egelyng Sigsgaard +9 more
wiley +1 more source
Haiyang yu huzhao伪雄鱼是由雌鱼性逆转而成的生理性雄鱼，在全雌鱼苗种的规模化繁育过程中有着至关重要的作用，但国内外对其精子活力的研究较少。为研究黄姑鱼伪雄鱼繁殖期精子活力及环境因子对其活力的影响，利用计算机辅助精子活力分析系统(CASA)对伪雄鱼的精子密度、运动率、寿命和运动速度等指标进行测定；并且设置不同的温度和pH梯度组，探究不同环境因子对伪雄鱼精子活力的影响。结果显示，伪雄鱼精子密度为(2.60~2.24)×1010个/mL；在繁殖期内，伪雄鱼精子密度呈逐渐下降的趋势，且在排精中期和晚期 ...
王 玙璠 +6 more
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Metal oxide‐based catalysts for oxygen reduction reaction (ORR) have drawn great attention in recent years. However, it remains technically challenging for the precise regulation of the overall performance due to the trade‐off effect among the activity, selectivity, and stability of electrocatalysts. Herein, a balancing strategy to control the
Haoran Ma +7 more
wiley +1 more source
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
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Prelithiation is effective for compensating active lithium‐ion (Li+) loss in silicon (Si)‐based battery electrode materials. However, owing to the dynamic growth of the solid electrolyte interface (SEI), capacity fading remains the biggest challenge for the industrialization of Si electrodes.
Wen‐Jie He +9 more
wiley +1 more source
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 The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng +6 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2009 目的探讨解脲支原体,精液白细胞与精子密度的关系。方法对275例男性不育患者精液样本进行分析,解脲支原体采用培养法进行检测,白细胞采用联苯胺染色方法进行检测,精子密度检测采用计算机辅助系统进行分析。结果UU阳性率为31.64%,白细胞阳性率为22.55%。UU阳性组精子密度显著低于UU阴性组 ...
孙忠凯 +5 more
doaj
夜间135.6 nm气辉反演的电离层
Kongjian kexue xuebao, 2023 在夜间电离层，气辉135.6 nm谱线主要由F层的O+和电子的辐射复合过程以及O+和O–的中性复合过程激发，该谱线强度和电离层峰值电子密度NmF2存在很强的相关性。利用夜气辉135.6 nm辐射强度与F2层峰值电子密度NmF2的平方成正比的物理模型，建立了在不同经纬度、地方时、季节和太阳活动下均适用的反演算法。通过DMSP卫星上搭载的紫外光谱成像仪（SSUSI）实际观测的135.6 nm气辉辐射强度来反演相应时空的电离层F2层临界频率f0F2，并将其与地基测高仪探测结果做了综合对比。结果表明 ...
薛 仕翔 +7 more
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