Results 31 to 40 of about 17,302 (169)

胭脂鱼(Myxocyprinus asiaticus)精子冷冻保存及对超微结构的影响

open access: yesHaiyang yu huzhao
胭脂鱼(Myxocyprinus asiaticus)是亚洲特有的淡水珍稀鱼类,但由于人类活动和生态环境的变化,胭脂鱼数量急剧减少,研究其精子冷冻保存技术及建立精子冷冻保存库,对种质资源的保护和遗传育种具有重要意义。选取健康的雄性胭脂鱼,经人工催产后获得成熟精子,首先对4种精子稀释液种类(D-17、D-15、D-20、人工精浆A)、4种抗冻剂种类(DMSO、GLY、MeOH、PG)及4种DMSO抗冻剂浓度(6%、8%、10%、12%)进行筛选,其次选取筛选后冷冻效果最好的冻精与鲜精做受精实验 ...
丁 小雨   +8 more
doaj   +1 more source

Bifunctional Competitive Structure of Biomass Carbon‐Derived Metacomposites for Tunable ε′‐Near‐Zero and ε′‐Negative Responses

open access: yesRare Metals, EarlyView.
ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang   +4 more
wiley   +1 more source

男性不育患者病毒感染状况与精子密度、活率、形态的关系

open access: yesZhongguo shiyan zhenduanxue, 2006
目的探讨男性不育患者病毒感染状况与精子密度、活率和精子形态的关系。方法分析469例男性不育患者病毒感染状况,采用改良间接ELISA法进行病毒检测,用伊红-Y染色法分析精子活率,计算机自动分析精子活力,采用精子形态检测系统下人工修正方法进行精子形态分析。结果469例男性不育精液样本中,检出病毒阳性率为8.32%,其中单纯疱疹病毒Ⅰ型1.92%,单纯疱疹病毒Ⅱ型2.56%,人类巨细胞病毒2.56%,风疹病毒1.28%。病毒感染阳性组精子密度和精子活率显著低于病毒感染阴性组(P0.05 ...
李哲   +5 more
doaj  

Functional interaction of mammalian sperm with the oocyte-cumulus complex in fertilization [PDF]

open access: yes, 2010
Thesis (Ph. D. in Biotechnology)--University of Tsukuba, (A), no.
Kang Woojin, 康 宇鎭
core  

Precise Tailoring of the Coordination Environment of Single‐Atom Cu(I) on Trifurcate AlL3 Supports for Click Chemistry

open access: yesRare Metals, EarlyView.
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
wiley   +1 more source

不同病因对男性不育患者精子形态的影响

open access: yesZhongguo shiyan zhenduanxue, 2012
目的探讨不同病因对男性不育患者精子形态的影响。方法 426例男性不育患者根据病因分为7组:精索静脉曲张组(68例)、慢性前列腺炎组(127例)、精索静脉曲张合并慢性前列腺炎组(36例)、特发性弱精子症组(42例)、少精子症组(115例)、小睾丸症组(21例)及其它组(17例),用瑞-姬氏染色法进行精子形态分析。以78例供精者精液检查结果作为对照。结果不育患者的形态正常精子百分率明显低于对照组 ...
王玉丰, 吴玲, 陈雪银
doaj  

单精子冷冻和常规冷冻对显微取精患者的胚胎培养及妊娠影响的比较

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2023
目的比较单精子冷冻和常规冷冻对显微取精患者的胚胎培养及妊娠影响。方法回顾性分析自2018年1月至2021年12月于中山大学附属第六医院生殖医学研究中心行显微镜取精术患者的临床资料,行单精子冷冻共39例307枚成熟卵子为单精子冷冻组,通过SPSS统计软件倾向性评分匹配女方基本助孕信息1:1匹配选择对照组,为常规冷冻组,共410枚成熟卵子,分析单精子冷冻与常规冷冻两组的受精、胚胎培养及移植后妊娠情况。结果单精子冷冻组和常规冷冻组的年龄、体质量指数(BMI)、不孕年限、基础基础卵泡刺激素(FSH ...
李婷婷, 刘贵华, 张靖, 孙桂花
doaj  

3D‐Printed Porous High‐Entropy Alloy Boosts Peroxymonosulfate Activation for Long‐Term Organic Pollutant Degradation

open access: yesRare Metals, EarlyView.
ABSTRACT High‐entropy alloys (HEAs) have attracted considerable interest from researchers owing to their tunable chemical compositions, exceptional structural stability, and promising catalytic properties. However, their large‐scale application is often hindered by complex manufacturing techniques and poor durability.
Sheng Guo   +9 more
wiley   +1 more source

用低渗膨胀试验评价黑猩猩冷冻精子的膜完整性

open access: yes野生动物学报, 2011
精液品质评定的常见方法有精子活力、畸形率和顶体完整率等指标,但这些指标不能评定精子的真实受精能力。目前低渗膨胀试验作为检验精子膜功能的一种方法得到广泛认可,利用它可检验具有完整膜的精子是否具有生化活性。本试验通过对冷冻2只黑猩猩精液进行低渗膨胀来评定冷冻精子的膜完整性。试验结果显示,本研究中的黑猩猩的冷冻精子在低渗溶液中的膨胀率较高,表明试验黑猩猩的冷冻精液有较高的活力,精子具有较高的穿透率和受精能力。
黄志宏   +5 more
doaj  

Study on polymorphism of sperm in Drosophila obscura species subgroup (Diptera: Drosophilidae) [PDF]

open access: yes, 1987
Thesis--University of Tsukuba, D.Sc.(B), no. 349, 1987.
Takamori Hisaki, 高森 久樹
core  

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