Results 11 to 20 of about 9,497 (200)
Zhongshan Daxue xuebao. Yixue kexue ban, 2004 【目的】钙火花是胞内基本的钙释放事件,既可以在静息的状态下随机产生,也可以被通过L-型钙通道内流的少量钙离子诱发产生。对钙火花特征和产生机理的研究极大地深化了我们对兴奋-收缩耦联过程的理解。本研究的目的旨在比较同一条件下自发钙火花和由loose-patch方法诱发的可以准确测量的钙火花之间在形态特征上的异同,以加深我们对钙火花的认识。【方法】激光共聚焦显微镜线扫描成像技术可记录到加载有荧光染料fluo-4的成年大鼠心肌细胞中随机产生的自发钙火花 ...
沈建新
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Zhongshan Daxue xuebao. Yixue kexue ban, 1995 对基本上不饮牛奶的中国儿童，应用双标稳定性同位素钙方法的新技术进行钙吸收的研究：将３４名每天摄入钙为１７２－１６４１ｍｇ的７岁儿童为对象并随机分成二组，其中一组每天添加３００ｍｇ元素钙，持续６个月。结果显示：①每天钙摄入在５００ｍｇ及以下和５００ｍｇ以上的两组儿童平均真实钙吸收率（ＴＰＣＡ）分别为６３％和５５％。均高于在白种儿童中所报告的数据，②对照组儿童６个月后其ＴＦＣＡ有生理性增高；③添加钙可引起ＴＦＣＡ明显下降，显示出渐降的规律。
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Thapsigargin对心肌细胞钙释放和肌浆网钙容量的时问效应 [PDF]
Zhongshan Daxue xuebao. Yixue kexue ban, 2004 【目的】肌浆网钙泵抑制剂thapsigargin (TC)常被用于耗减肌浆网(sarcoplasmic reticulum, SR)的钙 容措。本课题旨在探讨TC (I 00 nmol·L - 1)对源自SR的胞内钙释放和SR钙容损耗减的时间效应以及SR内钙 对SR钙释放的调节机理。（方法l局部场刺激作用于成年大鼠心肌细胞，使其产生动作电位，进而诱发胞内钙瞬变Caction-potential-induced Ca2 'transients, ACT)。由ACT可估测胞内钙释放。SR钙容蜇可由咖啡因 ...
沈建新 +3 more
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Zhongshan Daxue xuebao. Yixue kexue ban, 2004 细胞离子钙是最普遍、最重要的第二信使之一,参与包括肌肉收缩、突触传递、激素分泌、基因转录以及细胞分裂、受精、代谢和凝血等多种生理过程。对心肌细胞来说,离子钙将电活动与收缩联系起来,即介导细胞的兴奋-收缩耦联。1993年我们首次在激光共聚焦显微镜下发现心肌细胞胞内钙释放的基本单位———钙火花。历经十几年的研究,人们对钙火花和胞内钙信号的本质及兴奋-收缩耦联的微观机理的认识日趋深刻。特别是,新发展起来的非紧密封接膜片钳和激光共聚焦显微镜成像合成技术可以激活单个L型钙通道,通过钙致钙释放机制,诱发钙火花 ...
程和平
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, 1996 一、研制背景钙是人体的生命元素之一。在正常人无脂肪个体组织中,钙的平均含量为20.7—24.8克/公斤,其中99%是以晶体形式存在于骨骼组织中。研究表明,人在发育成长期,骨量呈增长趋势,到中年以后,骨量逐渐丢失,绝经后的妇女,骨量丢失尤为严重 ...
范支鹏
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Rationally selection of precursor additives during perovskite crystallization is essential for obtaining high‐quality films and achieving high‐performance perovskite solar cells (PSCs). However, the discovery and optimization of effective additives still rely heavily on time‐consuming and costly trial‐and‐error experiments.
Zhimin Feng +12 more
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The Evolution of Metal Halide Perovskite Transistors
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Metal halide perovskites (MHPs) offer a revolutionary pathway for next‐generation field‐effect transistors (FETs) because of their exceptional carrier mobilities and cost‐effective processability. However, their transition to practical electronics is significantly challenged by intrinsic instability and imbalanced charge transport. This review
Jiangnan Xia +8 more
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Ti‐15Mo‐2.5Ag alloy exhibited a low modulus and strong antibacterial ability but poor bioactivity. To resolve this problem, sandblasting and anodization were used to create a hydrophilic and nano‐Ag2O‐containing TiO2 coating. Subsequently, the microstructure and physicochemical properties were investigated by scanning electron microscopy, X ...
Yanchun Xie +11 more
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, 2000 以PVC为HCl的释放源，采用热重法对不同气氛下各种钙化合物的脱氯特性进行了研究，探讨了各种钙化物的脱氯机理以及脱氯效率。结果表明和PVC作为氯化氢的释放源是可行的。3种钙化物中氢氧化钙的脱氯效果最好。氧化钙与氢氧化钙的脱氯机理基本相似。各种钙化物在不同气氛下的脱氯机理是不同的。燃烧状态下 ...
郭小汾, 李凡
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Ultrasound in Obstetrics &Gynecology, Volume 68, Issue 3, Page 395-405, September 2026.ABSTRACT Objective To evaluate whether fetuses exposed to threatened preterm labor (PTL) without intra‐amniotic infection or inflammation (IAI), who were born ≥ 34 weeks' gestation, show signs of cardiac remodeling and dysfunction at admission and 4 weeks after the episode of threatened PTL.
C. Murillo +11 more
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