人体营养学基础知识(二)

维生素维生素也叫维他命,意思就是维持人体生命不可缺少的东西。人体对维生素的需要量极少,但是维生素对维持人体正常生长发育和调节生理功能至关重要。现在已知的维生素有20种,主要分成两大类:一类是能溶解在水里的,叫做水溶性维生素,如硫胺素(VB1)、核黄素(VB2)、抗坏血酸(VPP)、吡哆酸(VB6)、尼克酸(Vc)等;另一类是能溶解在脂肪里的,叫     

人体营养学基础知识（二）

维生素 维生素也叫维他命，意思就是维持人体生命不可缺少的东西。人体对维生素的需要量极少，但是维生素对维持人体正常生长发育和调节生理功能至关重要。现在已知的维生素有20种，主要分成两大类：一类是能溶解在水里的，叫做水溶性维生素，如硫胺素(VB1)、核黄素(VB2)、抗坏血酸(VPP)、吡哆酸(VB6)、尼克酸(Vc)等：另一类是能溶解在脂肪里的，叫做脂溶性维生素，如维生素A、D、E、K。     

医生在线

维生素是维持人体正常代谢过程中所必需的一种营养素。现实生活中,有不少人把维生素当补药使用,这是错误的。其实人体对维生素的需要量并不大,而且其需要量是一定的。维生素A和胡萝卜素有防癌作用,于是维生素A便成了最常用的保健药之一。一些离退休的老年恐癌者,长期大量服用,殊不知维生素A每日剂量超过5万国际单位就会出现中毒症状:全身不适、骨头痛、皮疹瘙痒、毛发干枯、脱发、肝功能     

嘴唇干裂怎么办

人体的嘴唇周围一圈发红的区域叫"唇红缘",它的湿润全靠局部丰富的毛细血管和少量发育不全的皮脂腺来维持,对日趋干燥的低温环境特别敏感,所以出现干燥脱水是很正常的现象,此时补水保湿就变得尤为重要.由于空气湿度小、风沙大,人体皮肤黏膜血液循环差,如果新鲜蔬菜吃得少,人体维生素B、维生素A摄入量不足,就会干燥开裂.     

维生素并非多多益善

维生素（Vitamin）是维持人体组织细胞正常生理功能不可或缺的重要物质，几乎参与了人体所有的新陈代谢过程，所以它在翻译成中文时，译音兼译义，曾被称为“维他命”：以人们熟知的维生素A为例，町促进眼内感光色素的形成，防治夜盲症和视力减退，并参与维持免疫系统正常功能，保护组织和器官表层组织，维护皮肤、头发、牙齿及牙床的健康。     

别让维生素变成＂危生素＂

维生素是维持人体组织细胞正常功能必不可少的物质。要合理使用维生素制剂,就要了解各种维生素的作用,以便做到对症下药,缺什么补什么,避免滥用,尤其不能把它当做补益品长期服用,以免使维生素变成“危生素”。     

好吃不宜多吃的食物

香肠 香肠在制作过程中，要加入一定比例的防腐剂——亚硝酸钠，而亚硝酸钠在人体中能与肉类蛋白质的胺结合，形成一种叫做二甲基亚硝基胺的物质，这是一种强致癌物。因此，香肠不宜多吃。不过，如能在吃香肠的同时．适当多吃一些豆芽、青椒、菠菜、黄瓜等新鲜蔬菜，或者在吃过香肠后吃点橘子、鲜枣、番茄等新鲜水果，就能在一定程度上消除致癌物对人体的危害。     

浅谈淬硬齿轮的加工方法

淬硬齿轮精加工工艺可分为两大类一类是采用非成形的切削刃,如齿轮磨削加工:另一类则是具有成形的切削刃,如淬硬齿轮(HRC48～53)滚削加工.     

提高免疫力的食物

秋冬季节,饮食清淡很重要,“三高”饮食会降低人体免疫力。而维生素能预防滤过性病毒和细菌的感染,并增强人体免疫系统功能,防止感冒侵袭。蔬菜、水果——维生素C:     

服用维生素,悠着点

随着人们健康意识的增强，许多人越来越重视健康投资。由于维生素是人体不可缺少的营养物质之一，如果缺乏会影响身体健康并造成一些疾病，所以，长期服用维生素的人越来越多。但服用维生素应在医生指导下进行，并非多多益善，要谨防服用维生素过量引起中毒。 维生素可以分为两类：一类是脂溶性维生素；另一类是水溶性维生素。脂溶性维生素主要包括维生素Ａ、Ｄ、Ｅ、Ｋ等，它们的特点是溶于脂肪中才容易吸收，而且吸收比较缓慢。脂溶性维生素吸收慢，排泄也慢，一旦中毒容易在体内储留较长时间，很难一下排除。如果把维生素Ａ当作滋补品大…     

公用事业公有制的多种实现形式

分析了公用事业由国有独资经营向公有制多种实现形式转化必须把握好的几个方面。同时,政府应加强对公用事业的宏观控制力。     

Accuracy of the judgment of facial expression of emotions as a function of sex and level of education

The purpose of this study is to examine the recognition of facial expressions of six emotions as a function of sex and level of education (high school, college, university) of the subjects. Three hundred French-speaking citizens of Quebec had to judge which emotion was expressed in various facial stimuli presented on slides. Results show that overall, the recognition of emotions was very good. However, there were significant and strong differences between emotions and sex and levels of education did not have strong effects on the results.This research was supported by grant EQ-1717 from Fonds FCAC (Gouvernment du Quebec).     

浅析廊坊市加快科学发展的思路及措施

主要从思想建设、产业结构调整、城乡一体化方面探讨廊坊市抓住发展机遇,加快科学发展的思路。     

Developing understanding of the idea of communities of learners

The idea of a community of learners is based on the premise that learning occurs as people participate in shared endeavors with others, with all playing active but often asymmetrical roles in sociocultural activity. This contrasts with models of learning that are based on one‐sided notions of learning— either that it occurs through transmission of knowledge from experts or acquisition of knowledge by novices, with the learner or the others (respectively) in a passive role. In this paper, I develop the distinction between the community of learners and one‐sided approaches from the perspective of a theory of learning as participation, and use two lines of research to illustrate the transitions in perspective necessary to understand the idea of communities of learners. One line of research examines differing models of teaching and learning employed by caregivers and toddlers from Guatemalan Mayan and middle‐class European‐American families; the other line of research involves a study of how middle‐class parents make a transition from their own schooling background to participate in instruction in a public US elementary school.     

The frequency of sexual abuse and depression in a sample of street children of one of deprived districts of Tehran

The purpose of this study was to determine the frequency of sexual abuse and depression among street children who live in a deprived district of Tehran. The researchers used the K-SADS questionnaire and a clinical interview were used to evaluate depression and sexual abuse in 87 street children in Tehran. Eighteen (20.9%) of the children had been sexually abused. Depressed children were 3.2 times more likely to be sexually abused than non-depressed children. Furthermore, 26 girls (86.7%) and 27 boys (48.2%) suffered from depression. The frequency of depression demonstrated a significant association with the father's or breadwinner's history of imprisonment or unemployment. Interventional programs providing education and support should be implemented for street children.     

劳动法视域下新生代农民工权利缺失问题

中国经济崛起和城市化进程过程中农民工的贡献有目共睹,城市让生活更美好的诱惑使得中国的新老两代农民工从农村流入城市,2008年1月1日的《劳动合同法》和《劳动争议调解仲裁法》让社会看到了改善农民工权利状况的希望,然而新生代农民工的权利保护尤其是作为一名劳动者的权利保护的现状依然不如人意,没有救济的权利不是真正的权利、迟来的正义是非正义,每年岁末对于农民工权益的突击性保障并不能从根本上解决问题,把包括农民工权益保障的社会问题纳入法治框架内、通过探析新生代农民工权利阙如问题及原因进而发现从制度层面进行解决才是解决农民工权益保障问题的根本途径。     

学龄儿童健康行为研究方法述评

学龄儿童健康行为研究越来越得到重视,在未来周期性的研究中也面临着在快速发展的背景下保持较高质量、在有限的财政资源情况下持续提高、使趋势分析与修改问卷内容相适应、满足科学受众和政策受众的不同要求等挑战,因此,完善其研究方法成为当前迫切需要。     

“吸毒人员未成年子女监护问题”研讨会综述

针对吸毒人员对其未成年子女的监护不力或监护缺失的现状，深入探讨了终止、剥夺乃至转移吸毒人员监护权的问题。涉及到监护权转移实践方面的问题，与会专家提出了临时监护人，短、长期寄养家庭，机构性质的儿童之家，儿童福利院等多种监护权转移方案。对一些存有疑义的问题，则是需要系统研究、统筹规划的新课题。     

The impact of generation and country of origin on the mental health of children of immigrants

The authors reexamine the study of generational differences in adjustment among the children of immigrants by arguing that the country of origin defines and shapes the adaptation process across generations. Using a sample of children in Toronto, the authors demonstrate that generational differences in the mental health of children occur only in families from countries of origin at the lowest levels of economic development. Among those at the lowest levels of economic development, a mental health advantage in the first generation evolves to a disadvantage in the 2.5 generation relative to third or later generational children. Children from backgrounds characterized by higher economic development show no initial or eventual differences from the native born. Using data from the Toronto Study of Intact Families, the authors are able to explain differences among children from low economic development backgrounds specifically in terms of increasing family conflict and decreasing school involvement across generations.