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1.
In vitro characteristics of human fetal cells have been investigated after chorionic villus sampling at the first trimester and amniocentesis at the second trimester of pregnancy. Light microscopy revealed heterogeneous morphology of cell types in both the chorionic villus culture and the amniotic fluid cultures. Based on the experiments performed, chorionic villus cells are more sensitive to pronase, trypsin, and versene during subculture and have a higher DNA content per single cell and release more [125I]-Beta-human chorionic gonadotropin into culture medium than those found in amniotic fluid cells. The practical applications of this study are discussed. 相似文献
2.
全面科学地分析了人类的行为与地质灾害后,针对我国当前的实际情况,提出了几个值得深思的问题,试图提醒人们如何规范自己的行为,以达到保护环境,预防和减轻地质灾害之目的。 相似文献
3.
《中国安全科学学报》1996,(Z1)
中国科学技术协会五届二次全委会明年在京召开我会两名代表参加全会活动中国科协第五届全国委员会第二次会议将于1997年2月22日至24日在北京召开。我会副理事长、中国科协全国委员会委员程映雪教授作为正式代表,我会副秘书长、“中国安全科学学报”主编徐德蜀高... 相似文献
4.
复杂人——机系统中的人因失误 总被引:26,自引:12,他引:26
随着人——机系统变得越来越多,装置的可靠性越来越高,人因失误已成为重要的潜在事故源。本文描述了复杂人——机系统的特征,探讨了该系统中人因失误的定义、分类、数据采集和事故模型。这些研究有助于对人因失误的预测、预防和减少。 相似文献
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6.
Susan Kaaria Jemimah Njuki Annet Abenakyo Robert Delve Pascal Sanginga 《Natural resources forum》2008,32(1):53-63
This paper presents lessons from applying an innovative action research approach for linking smallholder farmers to markets, in eastern and southern Africa. The Enabling Rural Innovation (ERI) approach aims to strengthen social organization and entrepreneurial capacity in rural communities. It focuses on fostering community‐based capacity for the inclusion of rural women and the poor in analyzing and accessing market opportunities. Using case studies from Malawi and Uganda the paper assesses the outcomes of ERI on rural communities with a focus on human capital, gender issues and investment in natural resource management. Results show that households are benefiting significantly from linkages to markets in terms of increasing household incomes, and accumulating assets. Skills in analyzing markets and in negotiating with traders have increased among smallholder farmers. The integration of gender in the approach has led to changes in gender decision making patterns at household and community level towards a more shared decision‐making process. The results however show a difference in skills between men and women, with women showing lower levels of skills acquisition. Farmer participatory research has increased investments in improved technologies such as fertilizer applications for soil fertility management. 相似文献
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探讨了微波辐射的致热生物效应,研究了微波辐射与人体热调节的关系,建立了考虑微波辐射致热效应的人体热调节系统模型。采用数值模拟方法能方便地定量分析微波辐射的致热生物效应。 相似文献
9.
典型电子垃圾拆解区居民多卤代芳烃的膳食暴露及其癌症风险评估 总被引:2,自引:2,他引:2
收集浙江典型电子垃圾拆解区和对照区的饮用水、蔬菜、豆类、米饭、鸡蛋、鱼、鸡肉和猪肉等8类食物样品共191个;采用GC/MS 5975B分析样品中23种PBBs,12种PBDEs和27种PCBs;评估当地居民的PHAHs膳食暴露现状及其癌症风险.结果表明,拆解区居民这三大类PHAHs的平均日摄入量是对照区的2~3倍,通过米饭摄入PHAHs的量占当地居民PHAHs总摄入量的48%以上.拆解区居民因食物摄入PHAHs的癌症风险(3.81×10-4)是对照区(1.50×10-4)的2倍多,其中二英类PCBs的风险值占总癌症风险的45%以上.通过米饭摄入PHAHs是主要的暴露途径,二英类PCBs是引起癌症风险的主要贡献因子,电子垃圾拆解释放出的PHAHs通过食物摄入进入居民体内引起的癌症风险要明显高于对照区. 相似文献
10.
Bioaccumulation of heavy metals in fishes from Taihu Lake, China 总被引:9,自引:0,他引:9
The Cr,Zn,Cu,Cd,Pb contents were determined in Cyprinus carpio Linnaeus,Carassius auratus Linnaeus,Hypophthalmichthys molitrix and Aristichthys nobilis,which were caught from Meiliang Bay,Taihu Lake,a large,shallow and eutrophic lake of China.The results showed that:(1)the Cr,Cu,Pb,Cd contents in the edible parts of the four fish species were much lower than Chinese Food Health Criterion(1994),but the Zn contents were higher than the Criterion;(2)Cd contents were the highest in the liver of fish,Pb contents were almost the same in all organs of fish,Cr contents mainly enriched in the skin and gonads,Zn contents were the highest in the gonad(♀),and Cu contents were the highest in the liver;(3)the total metal accumulation was the greatest in the liver and the lowest in the muscle.The total metal accumulation was the highest in C.auratus L.This investigation indicated that fish products in Taihu Lake were still safe for human consumption,but the amount consumed should be controlled under the Chinese Food Health Criterion to avoid excessive intake of Zn. 相似文献