Results 31 to 40 of about 9,466 (165)
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
Review of additively manufactured zinc alloys by laser powder bed fusion for biomedical applications
Rare Metals, Volume 44, Issue 11, Page 8262-8291, November 2025.Graphical abstract AbstractZinc (Zn) and its alloys have emerged as promising candidates for biomedical materials, owing to their controlled degradation kinetics, intrinsic biocompatibility, and the release Zn2+ ions which are known to promote bone regeneration and tissue healing.
Xuan Yang +5 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
Beyond Motivation: Modeling the Predictive Role of L2 Pride in Informal Digital Learning of English
International Journal of Applied Linguistics, Volume 35, Issue 4, Page 1938-1952, November 2025.ABSTRACT This study investigates the role of second language (L2) pride—an understudied affective factor—in shaping learners’ language learning motivation and involvement with informal digital learning of English (IDLE). Drawing on questionnaire data from 1388 Chinese university EFL students, the study employs structural equation modeling to examine ...
Minlin Minny Zou +3 more
wiley +1 more source
The study about the association of miRNA1269a SNP and the susceptibility to hepatocellular carcinoma [PDF]
, 2016 研究背景及目的： 基于早期肝癌患者缺乏特异症状和体征，而中晚期肝癌患者治疗效率又比较低并且预后较差，探讨肝癌的早期诊断与其发生机制具有重要意义。miRNA是一类由内源基因编码的长度约为22个核苷酸的非编码单链RNA分子，它们在动植物中参与转录后基因表达调控，其形成过程从长链pri-miRNAs到pre-miRNAs，最后形成成熟miRNAs，可直接结合到mRNA的3’UTR，从而抑制mRNA的翻译，导致mRNA的降解，进而影响蛋白质的表达，改变生物过程 ...
闵培
core
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 4, Page 433-442, October 2025.ABSTRACT Objective Currently, there are several surgical approaches to manage fetal open spina bifida (OSB), namely postnatal surgical repair, open fetal surgery and its minimally invasive alternative, fetoscopic repair. Our objective was to determine the optimal surgical approach for OSB, weighing the benefits and risks to the fetus and the pregnant ...
Y. Kunpalin +6 more
wiley +1 more source
EFFECT of PCBs (AROCLOR 1254) on SPERMATOGENESIS in TESTIS of MOUSE [PDF]
, 2009 多氯联苯（PCBs）是一类由人工合成的氯代芳烃类化合物，被称作潜在的内分泌干扰物。由于他们具有类雌激素和抗雄激素的性质，对雄性生殖系统造成极大危害，导致不育和一些性激素依赖的生殖功能丧失。他们能够引起内源性系统改变，类似天然性激素，并抑制性激素实现其功能。 本文目的是研究多氯联苯对雄性小鼠生殖系统的睾丸生长与发育的影响。雄性小鼠随机分成五组，每组21只。采用不同浓度Aroclor1254（0，0.5，5，50，500µg/kg）对小鼠进行灌胃染毒，每星期三次。暴露50天后处死小鼠，称其体重 ...
Joao Manuel Lopes Moreno
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野生动物学报, 1996 本文研究了地龟的睾丸与输精管组织结构变化，性成熟的雄性地龟，曲细精管是一种复层上皮管道组成。上皮细胞可分两种，一种是产生精子的生精细胞，另一种是起支持、营养及有分泌等功能的支柱细胞。上皮外面有一薄层基膜。曲细精管可见有不同发育阶段的雄性生殖细胞，从精原细胞到精子细胞，层层排列在管壁，愈是成熟的细胞便愈靠近小管的中心，最中心的就是精子。繁殖期间，观察了输精管的组织结构，管壁由粘膜、肌层和外膜三层组成。管腔内为大量成熟精子所充满，活体时具有活动性。
胡增高, 郭超文, 胡慧玲
doaj
Anatomical and Histological Studies on the Male Reproductive System of Thenus orientalis [PDF]
, 2000 【中文摘要】 东方扁虾雄性生殖系统由精巢、输精管及雄性生殖孔三部分组成 ,输精管可分为前、中、后三段。精巢由卷绕的前、后收集管及挂靠其上的许多生精腺囊所组成。同一腺囊内的精细胞发生基本同步 ,而不同腺囊内则可以不同步。收集管的主要功能是将精细胞团输送至输精管。精荚在输精管内运行时一直进行着精子的形成过程 ,直至精子成熟。位于输精管末段环肌层外的索带状细胞团被认为是造雄腺 【英文摘要】 The male reproductive system of Thenus orientalis is ...
叶海辉 +3 more
core
Infant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 5, Page 615-630, September 2025.Abstract The use of Infant and Early Childhood Mental Health Consultation (IECMHC) has grown dramatically over the past decade to support the skills and reflective capacity of adults who care for infants and young children birth to kindergarten entry. Research to date has shown promise for IECMHC to support children's social and emotional development ...
Margaret Franko +6 more
wiley +1 more source