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   586篇
  免费   40篇
儿科学   24篇
妇产科学   23篇
基础医学   34篇
口腔科学   25篇
临床医学   21篇
内科学   208篇
皮肤病学   2篇
神经病学   19篇
特种医学   1篇
外科学   24篇
综合类   4篇
一般理论   1篇
预防医学   200篇
眼科学   16篇
药学   7篇
中国医学   13篇
肿瘤学   4篇
  2023年   8篇
  2022年   17篇
  2021年   27篇
  2020年   22篇
  2019年   28篇
  2018年   22篇
  2017年   16篇
  2016年   26篇
  2015年   31篇
  2014年   31篇
  2013年   70篇
  2012年   23篇
  2011年   34篇
  2010年   25篇
  2009年   30篇
  2008年   24篇
  2007年   23篇
  2006年   23篇
  2005年   16篇
  2004年   22篇
  2003年   11篇
  2002年   18篇
  2001年   15篇
  2000年   9篇
  1999年   7篇
  1998年   8篇
  1997年   8篇
  1996年   7篇
  1995年   5篇
  1994年   1篇
  1993年   1篇
  1992年   4篇
  1991年   3篇
  1990年   1篇
  1989年   1篇
  1988年   2篇
  1986年   2篇
  1985年   1篇
  1984年   2篇
  1980年   1篇
  1978年   1篇
排序方式: 共有626条查询结果,搜索用时 15 毫秒
41.
PurposeInequitable attitudes toward men’s and women’s roles, rights, and responsibilities are associated with poor health–related outcomes, particularly for girls and women. Yet, we know relatively little about what interventions work to improve gender-equitable attitudes among adolescents in low-income countries. This study examines the impact of a government-implemented “cash plus” intervention on gender-equitable attitudes among adolescents in Tanzania. The intervention includes discussions and activities related to gender norms, embedded in broader life skills, livelihoods, and health training.MethodsThe study utilizes a cluster randomized design, using data from 1,933 males and females aged 14–19 years at baseline who took part in the baseline (2017), midline (2018), and endline (2019) surveys. Gender attitudes were measured using 24 items from the Gender-Equitable Men (GEM) Scale. We estimate intent-to-treat impacts on the GEM scale and four subscales (violence, sexual relationships, reproductive health, and domestic chores).ResultsThe “cash plus” intervention had a significant impact on the overall GEM scale at midline. The intervention increased gender-equitable attitudes on the domestic chores subscale at both midline and endline. The intervention improved gender-equitable attitudes among males on the overall GEM scale and three subscales at midline and on two subscales at endline, but it had no impacts among females.ConclusionsGender transformative social protection is currently being advocated as a way to address the gendered nature of poverty and its consequences. Initiatives such as the one studied here, which address the multifaceted drivers of gender inequities, could be a promising way forward.  相似文献   
42.
《Vaccine》2021,39(41):6041-6049
Globally, measles remains a major cause of child mortality, and rubella is the leading cause of birth defects among all infectious diseases. In 2012, the World Health Assembly endorsed the Global Vaccine Action Plan that set a target to eliminate Measles-Rubella (MR) in five of the six World Health Organization (WHO) regions by 2020. This was cross-sectional study employed both quantitative and qualitative research methods. The sample size was calculated to provide overall, age- and sex-specific coverage estimates for MR vaccine among children aged between 9 and 59 months at the national level. Using desired precision of ±5% with an expected coverage of 95%, a total of 15,235 households were required. The age of children, a child who had received the MR vaccine before the campaign, household wealth quintile, the age of caregivers, and their marital status were associated with non-coverage of MR vaccination among children aged 9–59 months in Tanzania. Nationally, an estimated 88.2% (95% CI: 87.3–89%) of children aged 9–59 months received the MR campaign dose, as assessed by caregivers’ recall. These estimates revealed slightly higher coverage in Zanzibar 89.6% (95% CI: 84.7–93%) compared to Mainland Tanzania 88.1% (95% CI 87.2–88.9%). These associated factors revealed causes of unvaccinated children and may be some of the reasons for Tanzania’s failure to meet the MR campaign target of 95 percent vaccination coverage. Thus, vaccine development must increase programmatic oversight in order to improve immunization activities and communication strategies in Tanzanian areas with low MR coverage.  相似文献   
43.
Inadequate macro- and micronutrient nutrition and its consequences, such as anaemia, iron and vitamin deficiency, and growth retardation, could particularly affect children of small-scale farmers. In the present cross-sectional study, 666 school children aged 5–10 years from villages of Chamwino and Kilosa districts were studied for associations between nutritional and micronutrient status and dietary intake. The overall prevalence of stunting, underweight, and overweight was 28.1, 14.4, and 5%, while that of anaemia and deficiency of iron (ID), vitamin A (VAD), and zinc (ZnD) was 42.9, 29.3, 24.9, and 26.4%, respectively. Dietary recalls (24h) revealed that, except of iron (74%), only small proportions of children reached the recommended daily micronutrient intakes: 4% for zinc, 19% for vitamin A, and 14–46% for B vitamins. Stunting was highly associated with wasting in both districts and with VAD in Chamwino. Anaemia was predicted by ID, VAD, and ZnD in Chamwino and by elevated infection markers, C-reactive protein (CRP) and α-1 glycoprotein (AGP), in Kilosa. Overall, elevated CRP and/or AGP increased the risk while higher serum carotenoids indicating a diet of more fruit and vegetables reduced the risk of VAD. The significantly lower prevalence of anaemia and ID in Chamwino was related to higher iron and vitamin A intake and the consumption of mainly bulrush millet with dark green leafy vegetables compared to maize or rice with legumes in Kilosa. Nutrition and hygiene education integrated with home and school garden programmes could reduce the multiple burdens of anaemia; micronutrient deficiencies and infections; and, in the long term, the prevalence of stunting.  相似文献   
44.
Objectives

Docosahexaenoic (DHA) and arachidonic (AA) acids are important for neurodevelopment. We investigated the relation between erythrocyte (RBC) DHA and AA contents and neurological development, by assessment of General Movements (GMs), in populations with substantial differences in fish intakes.

Methods

We included 3-month-old breastfed infants of three Tanzanian tribes: Maasai (low fish, n = 5), Pare (intermediate fish, n = 32), and Sengerema (high fish, n = 60); and a Dutch population (low–intermediate, fish, n = 15). GMs were assessed by motor optimality score (MOS) and the number of observed movement patterns (OMP; an MOS sub-score). RBC-DHA and AA contents were determined by capillary gas chromatography.

Results

We found no between-population differences in MOS. OMP of Sengerema infants (high fish) was higher than OMP of Dutch infants (low–intermediate fish). MOS related to age. OMP related positively to infant age (P < 0.001) and RBC-DHA (P = 0.015), and was unrelated to ethnicity and RBC-AA.

Discussion

The positive relation between RBC-DHA and the number of observed movement patterns of 3-month old infants might reflect the connection of DHA with motor development.  相似文献   

45.
Super-resistant Plasmodium falciparum threatens the effectiveness of sulfadoxine–pyrimethamine in intermittent preventive treatment for malaria during pregnancy. It is characterized by the A581G Pfdhps mutation on a background of the double-mutant Pfdhps and the triple-mutant Pfdhfr. Using samples collected during 2004–2008, we investigated the evolutionary origin of the A581G mutation by characterizing microsatellite diversity flanking Pfdhps triple-mutant (437G+540E+581G) alleles from 3 locations in eastern Africa and comparing it with double-mutant (437G+540E) alleles from the same area. In Ethiopia, both alleles derived from 1 lineage that was distinct from those in Uganda and Tanzania. Uganda and Tanzania triple mutants derived from the previously characterized southeastern Africa double-mutant lineage. The A581G mutation has occurred multiple times on local Pfdhps double-mutant backgrounds; however, a novel microsatellite allele incorporated into the Tanzania lineage since 2004 illustrates the local expansion of emergent triple-mutant lineages.  相似文献   
46.
The objective of the study was to translate and adapt the SF-36 Health Survey for use in Tanzania and to test the psychometric properties of the Kiswahili SF-36. A cross-sectional study was conducted as part of a household survey of a representative sample of the adult population of Dar es Salaam, Tanzania. The IQOLA method of forward and backward translation was used to translate the SF-36 into Kiswahili. The translated questionnaire was administered by trained interviewers to 3,802 adults (50% women, mean (SD) age 31 (13) years, 50% married and 60% with primary education). Data quality and psychometric assumptions underlying the scoring of the eight SF-36 scales were evaluated for the entire sample and separately for the least educated subgroup (n=402), using multitrait scaling analysis. Forward and backward translation procedures resulted in a Kiswahili SF-36 that was considered conceptually equivalent to the US English SF-36. Data quality was excellent: only 1.2% of respondents were excluded because they answered less than half of the items for one or more scales; ninety percent of respondents answered mutually exclusive items consistently. Median item–scale correlations across the eight scales ranged from 0.47 to 0.81 for the entire sample. Median scaling success rates were 100% (range 87.5–100.0). The median internal consistency reliability of the eight scales for the entire sample was 0.81 (range 0.70–0.92). Floor effects were low and ceiling effects were high on five of the eight scales. Results for n=402 people without formal education did not differ substantially from those of the entire sample. The results of data quality and psychometric tests support the scoring of the eight scales using standard scoring algorithms. The Kiswahili translation of the SF-36 may be useful in estimating the health of people in Dar es Salaam. Evidence for the validity of the SF-36 for use in Tanzania needs to be accumulated.  相似文献   
47.
The consumption of bottled and plastic-bagged drinking water in Tanzania has increased largely because of the deteriorating quality of tap water. It is uncertain whether these water products are safe for drinking. In this study, the microbiological quality of bottled and plastic-bagged drinking water sold in Dar es Salaam, Tanzania, was investigated. One hundred and thirty samples representing 13 brands of bottled water collected from shops, supermarkets and street vendors were analysed for total coliform and faecal coliform organisms as well as heterotrophic bacteria. These were compared with 61 samples of tap water. Heterotrophic bacteria were detected in 92% of the bottled water samples analysed. Total and faecal coliform bacteria were present in 4.6% and 3.6%, respectively, of samples analysed with a tendency for higher contamination rates in plastic-bagged drinking water. Microbiological quality of tap water was found to be worse compared with bottled water, with 49.2% and 26.2% of sampling points showing the presence of total coliform and faecal coliform organisms, respectively. The results suggest caution and vigilance to avert outbreaks of waterborne diseases from these types of drinking water.  相似文献   
48.
This paper highlights extensive variation in Muslim interpretations of sexual life by discussing views on and the management of sexual life in one specific locality (Zanzibar) where sexuality is perceived to be an ambivalent force, dangerous and creative at the same time. Efforts to channel sexuality in Zanzibar are directed at enhancing the positive side of sexuality and at controlling its negative force through sex education, gender segregation, the control of the body fluids and secrecy in the management of non-marital affairs. The paper discusses the positive and negative outcomes of sex and links them to the perceived ambivalent qualities of the body fluids involved, illustrating some of the strategies used to control sexual desire. The increasing spread of HIV and the influence of more essentialist trends in Zanzibari Islam draw attention to the capacity for dynamic adaptation of perceptions and practices.  相似文献   
49.
The introduction of antiretroviral treatment has resulted in the resumption of socially productive and sexually active lives of people living with HIV/AIDS, together with the desire for children. However, factors affecting the reproductive health needs of people living with HIV/AIDS are not well understood. With this in mind, the aim of this paper was to investigate factors associated with these health needs using a qualitative approach. Findings indicate that attitudes and perceptions about reproductive health needs are influenced by fertility beliefs, the central role of family, procreation and the perceived social and clinical consequences of pregnancies among people living with HIV/AIDS. While there was mixed opinion about acceptability of people living with HIV/AIDS, having children, marriage and family were institutions important for partnerships maintenance and procreation. These findings suggest that living with HIV in a community with strong pro-life attitudes is challenging for people living with HIV/AIDS who do not have children. Apart from having to grapple with potential stigma of not having children, people living with HIV/AIDS also face social challenges in realising their reproductive choices. Interventions to address stigma, societal changes and the integration of reproductive-health education into HIV care and treatment are needed.  相似文献   
50.
While antiretroviral medicines have reduced AIDS-related deaths in sub-Saharan Africa, many people still lose multiple family members and struggle with the social and economic consequences of those deaths. This paper examines how older Tanzanians frame feelings of loss caused by the untimely death of young adults and how they advise other bereaved about how to manage loss. A local concept oyegumisilize – meaning ‘to move on and push grief and worries aside’ – is employed in offering bereaved persons advice about how to deal with feelings of loss. Older people try hard to manage memories of loss whilst simultaneously struggling to fulfil the social obligations around mourning that contribute to their ongoing bereavement. Oyegumisilize can be seen as a counselling practice that helps those who have lost loved ones to move on with life and feel normal. It is argued that this form of counselling is a form of therapeutic speech, where the emphasis is not on ‘talking through’ emotions, but on speech that is aimed at ‘toughening up’ the bereaved person. The findings presented here are based upon ethnographic research undertaken in Muleba District in Kagera Region, Tanzania, between 2003 and 2004, and follow-up research conducted in 2005, 2008 and 2012.  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