Results 31 to 40 of about 10,045 (147)

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

A preliminary study on relation of seven metals content with humen semen quality [PDF]

open access: yes, 2010
本实验通过电感耦合等离子体质谱法(ICP-MS)测定精浆中七种金属(铅、镉、铬、锰、铜、砷、硒)的含量并检测精浆酸性磷酸酶(ACP)和α-葡萄糖苷酶的活性,与精液各项指标(精子密度、精子活动率、精子正常形态率等)进行相关性分析。得到以下结果:1.金属元素含量与精子活动率之间存在负相关性。精子活动率越高的样品中,金属含量越低;除镉元素外,其他元素含量与精子密度呈负相关。其中:铜、砷、铅三种元素与密度呈显著相关(PCu=0.002,PMn=0.007,PPb=0.009);除硒、镉外 ...
李萍
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体外受精周期获卵不多于三枚胚胎移植策略 [PDF]

open access: yes, 2020
目的探讨体外受精(IVF)周期获卵≤3枚胚胎移植策略。方法回顾性分析2017年1月至2019年4月于中山大学附属第六医院生殖医学研究中心行IVF/ICSI助孕患者共1 600个周期,分为3组:1组:新鲜周期D3移植(615例),2组:复苏周期D3移植(525例),3组:复苏周期囊胚移植(460例),收集3组患者助孕资料,多因素回归分析比较3组间的生化妊娠、临床妊娠及活产情况。结果3组患者年龄、基础FSH、AMH无明显差别,t检验结果均P>0.05,即两组数据总体一般资料无差异。1组与2组相比 ...
方丛, 李婷婷, 王艳芳, 陈攀宇
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In Situ Uniform Lithium Enrichment for Dense, High‐Performance LLZO Solid Electrolytes

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT A major challenge in garnet‐type Li7La3Zr2O12 (LLZO) system all‐solid‐state electrolytes is the high porosity that typically remains after sintering, which compromises ionic conductivity and degrades battery cycling performance. To address this, we propose an innovative strategy to achieve uniform lithium enrichment on the surface of ...
Yi‐Yang Xiao   +8 more
wiley   +1 more source

Effecf of Tributyltin on the Development of Gonad in Male Mice and Potential Mechanism [PDF]

open access: yes, 2008
三丁基锡(TBT)是一种重要的有机锡类化合物,在环境中大量使用,具有很强的毒性。近年,许多研究表明TBT对软体动物和鱼类生殖机能产生影响,但是有关对哺乳动物的生殖影响报道较少。本实验以青春期雄性小鼠为研究对象,在生态条件下和环境污染浓度范围内,采用不同浓度TBT(0.5、5、50μg/kg)对其进行灌胃染毒,每三天灌胃一次,暴露30天。通过光学显微镜观察精子质量;放射免疫法检测睾丸性激素水平;westernblotting方法检测性激素受体水平以及PCNA表达水平;并利用TUNEL法检测细胞凋亡情况 ...
陈瑜芳
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Recent Progress in the Development of Metal‐Based Radiosensitizations for Cancer Therapy: A Review

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Radiotherapy (RT) remains an indispensable means in cancer treatment; however, its therapeutic efficacy is often limited by tumor radioresistance and side effect of damage to healthy tissue. The advances in nanotechnology have propelled metal radiosensitizers to forefront of precision medicine.
Xiao‐Xia Wu   +12 more
wiley   +1 more source

新疆地区1500例男性不育症精液筛检结果分析

open access: yesZhongguo shiyan zhenduanxue, 2012
目的研究新疆地区男性不育患者精液质量状况。方法利用计算机辅助精液分析技术,收集1500例主诉不育的男性精液进行质量检测,并分析结果。结果新疆地区1500例男性不育患者精液一般性状检查显示,精液量平均2.7±1.3ml,异常率2.2%(33/1500);精液颜色异常率9.7%(146/1500);精子粘稠度异常率32.6%(489/1500);精子液化时间平均32.8±18.5min,异常率33.5%(502/1500);精液白细胞数异常率20.3%(305/1500)。精子质量检查提示精子密度平均(9 ...
王军, 吕红蕾, 黄海鹭
doaj  

The Genome of Phoebe zhennan (Lauraceae) and Comparative Genomics of Phoebe 楠木(樟科)基因组与楠属植物比较基因组学研究

open access: yesIntegrative Conservation, Volume 4, Issue 4, Page 584-599, December 2025.
Phoebe zhennan is a Chinese endemic and valuable timber species of Phoebe (Lauraceae). We present a chromosome‐level genome assembly of P. zhennan. Our research provides novel insights into the genome evolution of Phoebe, including whole‐genome duplication, phylogenetic relationships of magnoliids, and key MYB regulatory genes involved in lignin ...
Mao Yameng   +3 more
wiley   +1 more source

人精液中一氧化氮与蛋白质含量的关系

open access: yesZhongguo shiyan zhenduanxue, 2006
目的探讨人精液一氧化氮(NO)与总蛋白(TP)、白蛋白(Alb)和转铁蛋白(Tf)含量的关系。方法参照WHO标准方法,进行精液常规分析。采用镀铜镉还原荧光法检测NO代谢产物硝酸盐(NO-3)。用双缩脲法检测TP。溴甲酚绿法测定Alb。用免疫散射比浊法检测Tf含量。结果不育活率异常组、少精子和无精子症组的NO含量明显高于正常生育组,TP、Alb和Tf含量明显低于正常生育组,两组之间存在有高度显著性差异 ...
杨阳   +5 more
doaj  

View of Social Background:Introduction on Chinese Ancient Coition Medicine [PDF]

open access: yes, 2015
房中术是中国古代研究性生活与养生关系的一门学问,之所以在东周秦汉时产生和发展起来,有其深刻的社会背景。首先,东周秦汉之时,社会上淫风盛行,房中术应时而生,房中术的目标是既要保证性生活的量,又能提高性生活的质。其次,贵族阶层的一夫多妻制,客观上使家中男主人的房事任务变得非常繁重,房中术能提高男人有限性资源的利用效率,有助于营造和谐的家庭氛围。此外,房中术中的优生种子术是宗法制度的产物。东周时兴起的房中术,就是在前人种子与房中优生的零星知识基础上发展成系统的房中优生之术。Chinese ancient ...
孙孝忠
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