一种测定动物细胞平均沉降速率的新方法

通过构建细胞沉降过程的理想化模型，提出了一种简易的细胞沉降速率测定方法。标准颗粒沉降实验结果验证了这种方法的准确性。利用该方法测定杂交瘤细胞的沉降速率，定量描述了杂交瘤活细胞与死细胞之间的沉降速率差异，活细胞的沉降速率(15．5mm／h)大约是死细胞(9．36mm／h)的1．67倍，约是细胞碎片(1．46mm／h)的10倍；把该方法用于不同种类不同培养时期的脐血造血细胞，发现它们具有不同的沉降速率。这些数据将为细胞连续灌注培养过程的细胞截留研究提供依据。     

人类肩关节和髋关节关节唇发生学研究

采用解剖学和组织学的研究方法，对胎儿期肩关节和髋关节的关节唇进行了观察，得到了有关胎儿时期这两大关节的关节唇的发生时间，形态学和组织学结构特征的材料：1．肉眼可见的关节唇成型于胎儿3个月，与胎儿关节的发生同步，2．胎儿关节唇发生时为透明软髓，但随着胎龄增加有向纤维软骨转化的趋势。3．胎儿关节唇软骨中有血管存在，但血管的数量随胎龄增加而减少。     

21世纪初辐射防护的几个基本问题

辐射防护已有近百年的历史。20世纪下半叶随着核能和核技术应用的发展，辐射防护得到了较大的发展。但仍然有许多基本问题有待进一步研究。作为辐射防护基础的线性无阈理论受到挑战。从辐射防护观点出发，基于当前的科学水平，应该认为选择线性无阈模式是合理的。但从科学上说辐射剂量效应模式尚有待进一步研究。辐射环境影响是辐射防护面临的一个新问题。其生物学终点、参考生物和剂量评价模式等都有待深入研究。利益相关者的参与是解决放射性废物管理和核安全困境的重要途径，其参与方式和时机等值得进一步研究。     

Effect of leptin on oocyte maturation and subsequent pregnancy rate of cloned embryos reconstructed by somatic cell nuclear transfer in pigs

Cloning pigs by somatic cell nuclear transfer （SCNT） has wide applications in basic research, human medicine and agricultural production. To improve cloning efficiency, the effect of two basic maturation media, NCSU-23 and TCM199, was compared, and TCM199 was selected for the following experiments with leptin. We systematically studied the effects of leptin supplementation on oocytes in vitro maturation （IVM）, in vitro development of parthenogenetically activated （PA） and SCNT embryos and in vivo development of SCNT embryos after embryo transfer （ET）. The results showed that supplementation of 100 or 200 ng/ml leptin into the maturation medium did not greatly affect nuclear maturation of oocytes, or cleavage rates of PA and SCNT （P 〉 0.05）. Blastocyst rates of PA and SCNT embryos were significantly improved when 100 or 200 ng/ml leptin was added to maturation medium, and the number of cells in PA blastocysts was also improved （P 〈 0.05）. The number of cells in blastocyst of SCNT was improved, when 100 ng/ml leptin was added （P 〈 0.05）. Furthermore, supplementation of 100 or 200 ng/ml leptin to the IVM medium may improve pregnancy rate and the delivery rate inpig cloning.     

故意杀害孕妇的若干问题探讨

目前,故意杀害孕妇致使胎儿在孕育生长过程中遭受第三人不法侵害的案件频繁发生,我国关于胎儿保护立法不完善,因此在审理故意杀害孕妇胎儿案件时定罪量刑问题存在很大争议。通过对故意杀害孕妇人数计算问题、法学界关于故意杀害孕妇行为认定的评析和对故意杀害孕妇量刑适用的探讨,并借鉴国外立法,结合我国司法实践,进而探讨对我国故意杀害孕妇立法的量刑界定。     

日本公司推出3D胎儿打印

一些准妈妈常迫不及待地想让亲友知道胎儿的模样,现在她们不用发愁了,一家日本公司推出3D胚胎模型服务满足了她们的愿望。日本一家名为FASOTEC的公司推出的这项服务有个好听的名字一一"雕刻天使"。孕妇接受核磁共振检查后,该公司可以通过3D打印技术制作胚胎模型。胎儿的样子会被     

大爱无疆——记香港大学儿科学系刘宇隆教授

1悬壶济世——创建亚洲最大的原发性免疫缺陷病合作网 走进刘字隆教授整洁简单，摆设不多的办公室里，首先映入眼帘的，是一个敦煌飞天的匾额。这是2001年7月他随香港大学的同仁去台湾，为著名的慈善家证严法师颁赠“社会科学荣誉博士学位”并感谢他为港童脐血移植所做的贡献时，证严法师特别赠送的。至今，刘教授仍把它放在办公室最醒目的位置。刘教授说，     

阑尾可以随意舍弃吗

许多人得了急性阑尾炎,医生就会把阑尾切除,那么人的阑尾真的可以随意舍弃吗?     

Rapid diagnosis with FISH for chromosomal abnormality of fetal pyelectasia

Fluorescence in situ Hybridization （FISH） was used to investigate whether the chromosome of the fetus prenatally diagnosed as pyelectasis was normal or not. Amniotic fluid was taken from the pregnant woman whose fetus was detected with pyelectasia by prenatal examination. The chromosome of the amniotic fluid cell without culture was examined with FISH. The result shows that compared with the traditional amniotic fluid cell culture, FISH has the advantages of more rapid, higher sensitivity and specificity, and was 10-12 days earlier to complete the diagnosing than the traditional method. The fetuses detected chromosomal abnormality in each groups were induced during the middle and late trimester, while those fetuses with normal chromosome continued pregnancy, the rate of spontaneous disappearance of pyelectasia decreased as the severity of pyelectasia increased. FISH can satisfy the urgent need in the clinical prenatal diagnosis due to its rapidity to determine whether fetus with pyelectasia was accompanied with chromosomal.     

幼儿消费观的培养

目前音乐胎教的功效、方法等在我国还没有出台严格的标；隹，尽管某些方面研究证明，音乐对刺激胎儿的发育有一定好处，但胎教时音乐、音量的选择有较大的随意性，加之整个胎儿期大脑、神经发育都非常的娇嫩，因此，准妈妈们在胎教时不要过于盲目。