首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 78 毫秒
1.
随着时代的不断发展,中国传统的家庭婚姻观念已发生了很大的变化,似乎曾经让无数人为之追求的“白头到老”式的婚姻已经成为了许多人眼中的笑柄。近年来,离婚率的逐步上升,造成了生活在单亲家庭的孩子在逐年增多这一客观现实。尽管,从古至今出生于单亲家庭却最终成为优秀人才的有很多名人,如孔子、孟子、诸葛亮、杜甫、鲁迅、巴金、老舍、茅盾等等,但是与普通家庭相比,单亲家庭毕竟是家庭的“非常态”,这种“非常态”容易让儿童“偏离”正常的成长轨道,有人对单亲家庭儿童进行研究,得到的是五花八门的数据。  相似文献   

2.
《医药与保健》2008,16(2):62-63
白内障眼疾导致患者失明,使人类饱受失明折磨、生活质量下降的历史由来已久,40年代,英国率先采取手术摘除白内障合并人工晶体植入复明手术取得了成功,70年代,这项复明术开始在国外广泛运用于临床,80年代中、晚期美国等发达国家,临床应用这项复明技术逐渐成熟,几乎所有眼科医院都普遍采用这项治疗技术。就在这个时期,我国赴国外的医疗学者将这项已经成熟的治疗技术带回国内,使国内数百万白内障患者彻底解除了失明的痛苦。伴随着科技的发展进步,在手术方法上,从普通白内障摘除术到超声乳化吸除术,手术时间短,患者痛苦少;从人工晶体材料上由硬晶体发展为软晶体,使手术创口小、恢复快,尤其近期研发的非球面多焦点人工晶体不仅使复明患者不用带眼镜看远清晰、看近清晰,看中间距离视觉也清晰,彻底解决了复明患者全程视力,白内障复明手术正改变和提高人类生活质量……  相似文献   

3.
沉默信息调控子2(the silent information regulator2,SIR2)是一种高度保守,具有烟酰胺腺嘌呤二核苷酸(nicotimide adenosine dinucleotide,NAD)依赖性的组蛋白去乙酰基转移酶,调控酵母、蠕虫和果蝇的生命周期,及哺乳动物的应激反应.SIR2参与转录和重组沉默,对于染色质沉默及细胞其他一些功能具有重要作用.  相似文献   

4.
电磁辐射(electromagnetic)是能量以电磁波形式在空间传播的物理现象,是继"三废"污染之后的第四大环境污染源.近年随着通讯事业的飞速发展,移动电话的广泛应用,其所产生的射频磁场对人类健康的影响也越来越受到重视.英国电离辐射防护委员会(NRPB)公布的"2004年移动电话与健康报告"及相关的研究结果在社会上引起很大反响.  相似文献   

5.
如何防止“春困”气候日渐转暖,人体表的毛细血管因舒展而增加血流量,使脑组织的血流量相应减少,出现困倦、疲乏、嗜睡的现象,这就是人们常说的“春困”。有“春困”症状的人,往往有失眠多梦、五心烦热、潮热、舌红等“阴虚”现象。饮食上要多食马兰头、荠菜、芹菜等滋阴的食物,少吃桔子、羊肉等温性食物,也可用西洋参等  相似文献   

6.
近几年来,仅据有媒体报道的,老年人因炒股猝死的悲剧就有多例。如今年2月,上海市一年近六旬的老股民,在证券公司突发脑溢血,经抢救不治身亡;3月,一位70多岁的老股民突发心脏病,猝死在西安某证券营业部内;3月28日股市大幅波动,徐州一名53岁的女股民突然休克,停止呼吸;5  相似文献   

7.
新年伊始,王玉的丈夫经常到外地做项目,原来浪漫的生活一下子安静下来。王玉每天下班回来,心中常常会莫名其妙地冒出孤独的感觉。特别是每到周末,看到邻居、同事出双入对,这种孤独还会伴随着说不清缘由的烦躁,更加强烈……  相似文献   

8.
玉米须是玉米的丝状花柱,含有大量硝酸钾、维生素K、生育酚醌、谷甾醇、萍果酸、皂甙等。经现代药理实验证明,玉米须具有利尿、降压、降糖、止血、利胆等作用。中医学认为,该品味甘淡,性平,入肝、肾、小肠三经,功能利尿消肿,平肝利胆,通乳泄热。它可用于治疗下列疾病:  相似文献   

9.
兰州市永登县乡镇2 382名小学生健康状况调查分析   总被引:1,自引:0,他引:1  
目的 了解兰州市永登县乡镇2 382名小学生的营养状况和常见病的患病情况,为开展学校卫生保健工作提供参考依据.方法 采用整群抽样的方法,选择2004年兰州市永登县4所乡镇小学(中川小学、浪排小学、河桥小学和牛站小学)8~13岁小学生为研究对象,采用身高、体重、视力、常见病及患病情况等为观察指标.对其小学生健康体检表进行分析和评价.结果 各年龄组小学生营养不良和肥胖的比例均较高,其中男生肥胖比倒高于女生,女生营养不良的比例高于男生;随着年龄的增长,小学生的视力不良发生率逐年上升,且女生视力不良发生率高于男生;常见病主要为乙肝、中耳炎、视力不良、沙眼和鸡胸.结论 与城市相比,永登县乡镇小学生的健康状况尚存在一定问题,生长发育较差,营养不良、视力低下、龋齿、沙眼、乙肝和中耳炎发病率较高.  相似文献   

10.
我是一名不到30岁的职业女性,现在,我的婚姻出现了危机。当初,我以优异的成绩从医学院毕业,回到本地一所医院上班。刚刚参加工作不久的一天,一个中学时代的男同学得了乙肝,来找我诊治,他于是成了我的病人。我凭着工作的热情,凭着对业务学习时打下的较深的基础,正好把这个病例当成我的一次临床实践,在老主任的帮助下,竭尽全力把同学的病尽快治好。他也很配合我的治疗,病真的很快就好了。这让我非常激动。更让我激动的是,随着我们治疗上的默契配合,我们的感情也融  相似文献   

11.
12.
13.
Nucleic acid vaccines provide an exciting approach for antigen presentation to the immune system. As a test of this new methodology, the immune response to the in vivo-expressed Brucella abortus ribosomal L7/12 gene in the muscle cells of mice was examined. To accomplish this goal the eukaryotic expression systems pcDNA3 and p6 were used. Single intramuscular injection of the L7/L12 gene driven by the human cytomegalovirus (CMV) promoter (pcDNA3) or bovine MHC I promoter (p6) resulted in intracellular expression of the B. abortus L7/L12 immunodominant protein encoded by this gene. This application facilitated directed antigen presentation to the immune system and established specific antibody and T-cell responses compared with vector only (pcDNA3) negative controls and B. abortus S19 injected positive controls. Although pcDNA3-encoded L7/L12 gene-inoculated mice possessed significant protection, p6-L7/L12 did not engender significant protection against B. abortus S2308 infection compared to positive control mice. These data suggest a promising antigen-specific response, and L7/L12 nucleic acid vaccination may be an initial step in the development of genetically engineered candidate vaccines against brucellosis. This study for the first time focuses on DNA immunization of a gene from B. abortus.  相似文献   

14.
Perfluorooctane sulfonate (PFOS) is an anthropogenic compound found in trace amounts in many environmental compartments far from areas of production. This, along with the highly persistent nature of PFOS, presents a concern for possible effects in aquatic ecosystems. The objective of this study was to determine the toxicity of PFOS in representative freshwater organisms. Toxicity testing using standard laboratory protocols was performed on the green algae Selenastrum capricornutum and Chlorella vulgaris, the floating macrophyte Lemna gibba, and the invertebrates Daphnia magna and Daphnia pulicaria. No observable effect concentration (NOEC) values were generated from the most sensitive endpoints for all organisms. Autotroph inhibition of growth NOEC values were 5.3, 8.2, and 6.6 mg/L for S. capricornutum, C. vulgaris, and L. gibba, respectively. The 48-h immobility NOEC values for D. magna and D. pulicaria were 0.8 and 13.6 mg/L, respectively. In comparison to immobility, the 21-day lethality NOEC for D. magna was 5.3 mg/L. Based on effect (immobility) values, the most sensitive of all test organisms was D. magna. The most sensitive organism based on 50% inhibition of growth (IC50) was L. gibba, with an IC50 value of 31.1 mg/L determined from wet weight. This is 4.3 times less than the LC50 for D. pulicaria, which was 134 mg/L. Significant adverse effects (p ≤ 0.05) were observed for all organisms in concentrations >134 mg/L. The results indicate that under laboratory conditions PFOS is acutely toxic to freshwater organisms at concentrations at or near 100 mg/L. Based on known environmental concentrations of PFOS, which occur in the low ng/L to low μg/L range, there is no apparent risk to freshwater systems. However, further work is required to investigate long-term effects in these and other freshwater organisms. Received: 2 May 2002/Accepted: 29 July 2002  相似文献   

15.
16.
【目的】 探索建设世界一流科技期刊的策略,以助力中国科技期刊冲刺世界一流水平。【方法】 通过研读相关政策和研究文献,结合对NatureScienceThe LancetCell等不同类型的世界一流科技期刊的分析,解析世界一流科技期刊的概念及内涵,探讨建设世界一流科技期刊的充分条件和必要条件,提出建设世界一流科技期刊的建议。【结果】 卓越的办刊理念、全方位的国际化水平、世界一流的人才队伍、先进的经营管理水平以及汇聚一流前沿成果、卓著的科学声望是建设世界一流科技期刊的必要条件。“高、精、尖”和“稳、准、狠”的办刊策略,是建设世界一流科技期刊的充分条件。建设世界一流科技期刊要理性且准确地认知其内涵,始终坚持卓越的办刊理念、国际化战略、人才战略、质量战略和集群化战略。【结论】 中国科技期刊既要扎根祖国大地,又要学习世界一流期刊的成功经验,从办刊的硬实力和软实力方面吸收借鉴,才能探索出具有中国特色的世界一流科技期刊建设路径。  相似文献   

17.
空肠弯曲菌Cj1136、Cj1138、Cj1139基因对比研究   总被引:2,自引:0,他引:2       下载免费PDF全文
目的 了解吉兰-巴雷综合征(GBS)相关空肠弯曲菌(C.jejuni)的Cj1136、Cj1138、Cj1139基因序列特征,并同GenBank中的非GBS相关C.jejuni菌株对应序列进行比较,找出可能使C.jejuni菌株具有致GBS能力的碱基突变.方法 选取分离自GBS患者粪便并经动物模型证实为致GBS的AMAN型C.jejuni 3株进行培养并提取基因组DNA测序.将基因测序结果与NCTC11168菌株进行对照比较,寻找此3株C.jejuni的Cj1136、Cj1138、Cj139基因突变位点,并计算此3株致GBS C.jejuni的Cj1136、Cj1138、Cj1139基因序列间的遗传距离.结果 3株致GBSC.jejuni菌株的Cj1136基因由1173个碱基构成;Cj1138基因由1170个碱基构成;Cj1139基因由912个碱基构成,与NCTC11168的Cj1136、Cj1138、Cj1139基因序列相比,此3株致GBS C.jejuni中只有Cj1138存在2个相同的碱基突变.遗传距离计算,3株致GBS C.jejuni的Cj1136、Cj1138、Cj1139基因之间最大遗传距离为2.1%.结论 与NCTC11168相比GBS相关C.jejuni中Cj1138基因序列存在相同碱基突变,这些碱基突变可能与C.jejuni致GBS能力的改变相关.该3株致GBSC.jejuni的Cj1136、Cj1138、Cj1139基因遗传距离较小,反映河北地区致GBS的C.jejuni在进化上存在聚类现象,具有一定的区域特征.  相似文献   

18.
The compositions of natural fruiting bodies of Cordyceps sinensis (NFCS), mycelia from submerged culture (MSMC) and shake culture (MSKC) of RCEF0273, a strain of Hirsutella sinensis, anamorph of C. sinensis, were compared to evaluate the potentiality of MSMC. The contents of crude fat, crude protein, total and essential amino acids were in the following descending order: MSKC>MSMC>NFCS, respectively. Unsaturated fatty acids of MSMC accounted for 65.9% of total fatty acids, obviously lower than those of NFCS (86.9%) and MSKC (76.5%). Both As and Hg were lower than 0.20 μg/g in all samples tested. The contents of Ca, Se and Cu were higher in MSMC than in NFCS, while the contents of Fe, Zn and Sn, were lower in MSMC than in NFCS. Vitamin B6 was not detected in MSMC but in NFCS, while vitamin B1 was not found in NFCS but in freeze-dried MSMC. Niacin content of NFCS was 1.6 times more than that of MSMC. The total content of four nucleosides (adenosine, guanosine, uridnine and inosine) in MSMC (6.20 mg/g) was significantly higher than those of NFCS (1.80 mg/g) and MSKC (1.60 mg/g). The above results suggest that MSMC can probably be used as a substitute for NFCS.  相似文献   

19.
Phylogenetic analyses were used to test the hypothesis that the Jiv90 insert in the genomes of Pestivirus species originated by horizontal transfer from their hosts (mammals in the order Artiodactyla). The results supported this hypothesis because the Jiv90 insert clustered with the corresponding domains of mammalian Jiv proteins and closer to artiodactyl than to rodent or primate genes. A phylogeny of Pestivirus genotypes showed that the Jiv90 insert occurred only in one clade (Pestivirus Type 1), although numerous members of this clade lacked the insert. This pattern is probably most easily explained on the hypothesis that the insert occurred in the common ancestor of the Type 1 clade and that it has been subsequently lost independently by several members of the clade.  相似文献   

20.
目的 研究国内外土拉弗朗西斯菌的遗传进化关系。方法 选择17个单核苷酸多态性、4个插入/缺失和12个可变数目串联重复,采用单核苷酸多态性和插入/缺失、多位点可变数目串联重复分析方法单独和组合起来对39株土拉菌(10株中国土拉菌和29株已公布测序的土拉菌)进行系统进化分析。结果 组合分析显示,3株中国土拉菌和日本的FSC022被分配到B5;剩余3株中国土拉菌和瑞典的FSC200被分配到B1;3株和美国的OSU18被分配到B2;1株和法国的FTNF002-00、德国的F92与美国的OR96246一起被分配到B4。10株中国土拉菌分为4种亚型,研究表明中国土拉菌具有广泛的遗传多样性。结论 本研究针对土拉菌B型建立了一套简易高效的分型方法,并以此为基础得出土拉菌B型的起源可能是亚洲地区。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号