首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   308篇
  免费   14篇
  国内免费   4篇
耳鼻咽喉   2篇
儿科学   50篇
妇产科学   6篇
基础医学   40篇
口腔科学   55篇
临床医学   20篇
内科学   49篇
皮肤病学   7篇
神经病学   28篇
特种医学   2篇
外科学   16篇
综合类   3篇
预防医学   22篇
眼科学   7篇
药学   12篇
肿瘤学   7篇
  2022年   4篇
  2021年   13篇
  2020年   8篇
  2019年   3篇
  2018年   4篇
  2017年   3篇
  2016年   4篇
  2015年   5篇
  2014年   3篇
  2013年   10篇
  2012年   17篇
  2011年   12篇
  2010年   9篇
  2009年   10篇
  2008年   14篇
  2007年   7篇
  2006年   11篇
  2005年   9篇
  2004年   14篇
  2003年   12篇
  2002年   13篇
  2001年   7篇
  2000年   3篇
  1999年   4篇
  1997年   2篇
  1995年   5篇
  1993年   4篇
  1992年   6篇
  1991年   10篇
  1990年   9篇
  1989年   8篇
  1988年   8篇
  1987年   6篇
  1986年   8篇
  1985年   12篇
  1984年   3篇
  1983年   6篇
  1982年   4篇
  1981年   2篇
  1980年   3篇
  1979年   3篇
  1978年   3篇
  1977年   4篇
  1974年   2篇
  1973年   4篇
  1972年   2篇
  1971年   2篇
  1970年   2篇
  1969年   2篇
  1968年   2篇
排序方式: 共有326条查询结果,搜索用时 15 毫秒
321.
A small outbreak of toxic methemoglobinemia occurred among infants in a pediatric ward. Investigation revealed that the most likely source of toxicity was an approved fat preservative which had been added to a soybean infant formula by the manufacturer. This fat preservative contained three phenolic compounds having highly effective antioxygenic properties (butylated hydroxyanisole, butylated hydroxytoluene and propyl gallate). The outbreak ceased when the offending agents were eliminated from the food preparation. It is emphasized that the approval of chemicals for use in the food industry through toxicity studies does not necessarily guarantee against the hazards of toxicity, especially during infancy.  相似文献   
322.
A committee nominated by the Israel Ministry of Health examined the relevant literature and the local recommendations as well as the recommendations from other countries and suggested a daily micronutrient supplementation for institutionalized elderly living in institutions supervised by the Ministry of Health. The micronutrient preparatory, tailored for this population, is designed to contain about half the RDA for most of the vitamins and some microelements. Biotin and vitamins C, D and B12 as well as zinc, copper, chromium and molybdenum are suggested at a level higher than half the RDA, whereas fluorine, at a lower level. Major elements (calcium, magnesium and phosphorus) are excluded and should be supplied separately. Vitamin K and iron are also excluded. Fat-soluble vitamins should be microencapsulated. Micronutrient supplementation for institutionalized elderly is part of the Ministry of Health s balanced nutrition policy. The committee s recommendations are also applicable to the free-living elderly population.  相似文献   
323.
324.
325.
    
Thin films of CuSe were deposited onto GaAs substrate. XRD showed that the as-deposited films were of the Klockmannite (CuSe – P63/mmc 194) phase with lattice parameters a0 = b0 = 0.3939 nm, c0 = 1.7250 nm; however, electron diffraction in the TEM surprisingly indicated the β-Cu2−xSe phase (Cu1.95Se – R3̄m 166) with lattice parameters a0 = b0 = 0.412 nm, c0 = 2.045 nm. The discrepancy originated from the specimen preparation method, where the energy of the focused ion beam resulted in loss of selenium which drives a phase transition to β-Cu2−xSe in this system. The same phase transition was observed also upon thermal treatment in vacuum, as well as when the 200 keV electron beam was focused on a powder sample in the TEM. The initial phase can be controlled to some extent by changing the composition of the reactants in solution, resulting in thin films of the cubic α-Cu2−xSe (Cu1.95Se – Fm3̄m) phase co-existing together with the β-Cu2−xSe phase.

Ion beam irradiation causes Klockmannite CuSe to lose Se and transform into β-Cu2Se. Caution must be taken when using the dual beam FIB for preparing TEM specimen.  相似文献   
326.
    
Two of the most prominent challenges faced by people with mental health conditions (MHCs) are experiencing stigma and personal recovery. This study focused on the analysis of baseline data from registrants for integrated arts‐based groups in a nationwide psychosocial rehabilitation program in Israel. The aim of the study was to examine the possible associations between self‐stigma, personal recovery and creative self‐efficacy (CSE) in people with MHCs, and the associations between public stigma, desire for social distance, familiarity with mental illness and CSE in community members. Cross‐sectional data were collected by online survey software in October‐November 2017 from 114 people with MHCs and 117 community members who enrolled in 15 integrated arts‐based groups, and 68 people with MHCs who were not enrolled in integrated groups. The main findings suggest that individuals with MHCs who reported high self‐stigma also reported a low sense of personal recovery and low CSE. The CSE of those with MHCs correlated positively with their personal recovery. Among community members, high public stigma was associated with a greater desire for social distance in women, but less contact with MHCs in men. Individuals with MHCs who had previously participated in integrated arts‐based groups reported greater personal recovery than those who had not. Community members reported higher CSE and public stigma than the CSE and self‐stigma of individuals with MHCs. The findings help characterise both individuals with MHCs and non‐clinical community members who decide to enrol in integrated groups, as well as individuals with MHCs who chose not to enrol, enabling similar community‐based programs to better identify their conditions and meet their needs. Future research should examine the contribution of integrated arts‐based groups to promoting recovery and reducing stigma.  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