全文获取类型
收费全文 | 3144篇 |
免费 | 157篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 31篇 |
儿科学 | 52篇 |
妇产科学 | 64篇 |
基础医学 | 333篇 |
口腔科学 | 69篇 |
临床医学 | 236篇 |
内科学 | 774篇 |
皮肤病学 | 24篇 |
神经病学 | 319篇 |
特种医学 | 88篇 |
外科学 | 627篇 |
综合类 | 9篇 |
预防医学 | 132篇 |
眼科学 | 20篇 |
药学 | 150篇 |
中国医学 | 2篇 |
肿瘤学 | 403篇 |
出版年
2024年 | 3篇 |
2023年 | 18篇 |
2022年 | 42篇 |
2021年 | 99篇 |
2020年 | 64篇 |
2019年 | 88篇 |
2018年 | 87篇 |
2017年 | 89篇 |
2016年 | 75篇 |
2015年 | 105篇 |
2014年 | 113篇 |
2013年 | 181篇 |
2012年 | 237篇 |
2011年 | 214篇 |
2010年 | 137篇 |
2009年 | 146篇 |
2008年 | 217篇 |
2007年 | 192篇 |
2006年 | 197篇 |
2005年 | 199篇 |
2004年 | 186篇 |
2003年 | 161篇 |
2002年 | 137篇 |
2001年 | 27篇 |
2000年 | 8篇 |
1999年 | 23篇 |
1998年 | 29篇 |
1997年 | 25篇 |
1996年 | 24篇 |
1995年 | 14篇 |
1994年 | 14篇 |
1993年 | 10篇 |
1992年 | 16篇 |
1991年 | 11篇 |
1990年 | 9篇 |
1989年 | 13篇 |
1988年 | 7篇 |
1987年 | 17篇 |
1986年 | 14篇 |
1985年 | 5篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1981年 | 7篇 |
1980年 | 14篇 |
1979年 | 4篇 |
1977年 | 5篇 |
1974年 | 3篇 |
1973年 | 3篇 |
1934年 | 2篇 |
排序方式: 共有3333条查询结果,搜索用时 15 毫秒
71.
72.
Van Geertruyden JP Ntakirutimana D Erhart A Rwagacondo C Kabano A D'Alessandro U 《Tropical medicine & international health : TM & IH》2005,10(7):681-688
OBJECTIVES: The aim of the study was to assess the knowledge, attitude and practices of pregnant women towards malaria and their association with malaria morbidity. METHODS: Cross-sectional malaria survey of 1432 pregnant women attending six health centres, each of them situated in a specific health district in Rwanda from September to October 2002. RESULTS: The overall prevalence of malaria infection was 13.6% and all infections but two were caused by Plasmodium falciparum. The six health districts were significantly different in terms of malaria prevalence, which varied between 11.5% and 15.4% in four and was <5% in the other two districts. The prevalence of anaemia and splenomegaly mirrored that of malaria infection. In three districts, the prevalence of infection was significantly higher in primigravidae than in secundigravidae and multigravidae (P = 0.01), while in two others it did not vary with parity. Bed net use was low - only 13.1% of the women had at least one bed net at home and 8.3% of them slept under it - and significantly different between districts. Most women knew that malaria might have serious consequences for their pregnancy and that insecticide-treated bed nets are useful for malaria prevention. However, the bed net market price [1525 Rwandan Francs (RFr), approximately 1.6] was much higher than that considered as affordable and acceptable (389 RFr, approximately 0.3). CONCLUSION: Malaria in pregnancy is a major problem in Rwanda, even in the districts of low transmission. Bed net use among pregnant women is low. The option of providing free insecticide-treated bed nets to pregnant women should be explored and possibly implemented; it could rapidly increase bed net use and earlier attendance to antenatal clinics with clear benefits for the women's health. 相似文献
73.
74.
Umberto Albert David De Cori Andrea Aguglia Francesca Barbaro Fabio Lanfranco Filippo Bogetto Giuseppe Maina 《Journal of affective disorders》2013
Background
Lithium is recommended as a first-line treatment for Bipolar Disorder (BD). Thyroid and renal alterations are well known lithium side-effects, while effects on parathyroids are less studied. The aim of this case-control cross-sectional study is to compare parathyroid hormone (PTH) and calcium levels in lithium-exposed bipolar patients and in subjects who had never been exposed to lithium.Methods
112 BD patients were enrolled, 58 on lithium since at least 1 month (mean exposure 60.8±74.8 months) and 54 in the control group. Blood exams included complete blood count, PTH, total and ionized calcium, TSH, T3 and T4, creatinine, urea, sodium and potassium, and lithium serum levels. The Student's t-test and the Pearson's Chi-square test were used for bivariate analyses. A linear regression model was used to analyze the relationship between the duration of exposure to lithium and PTH and calcium levels.Results
PTH and ionized calcium levels were significantly higher in lithium-exposed patients; the proportions of subjects with hyperparathyroidism (8.6%) and hypercalcaemia (24.1%) were significantly greater in lithium-exposed patients. The linear regression analyses showed a significant effect of exposure to lithium in months on ionized calcium levels but not on PTH levels.Limitations
Given the cross-sectional design of the study we could not identify the exact time of occurrence of hyperparathyroidism.Conclusions
Our results indicate that lithium-associated stimulation of parathyroid function is more common than assumed to date. Among parameters to be evaluated prior to lithium implementation and during long-term lithium maintenance, calcium (and eventually PTH) should be added. 相似文献75.
Damiani Stefano Tarchi Livio Scalabrini Andrea Marini Simone Provenzani Umberto Rocchetti Matteo Oliva Francesco Politi Pierluigi 《European child & adolescent psychiatry》2021,30(4):619-631
European Child & Adolescent Psychiatry - Attention-Deficit/Hyperactivity Disorder (ADHD) comprises disturbances in attention, emotional regulation, and reward-related processes. In spite of the... 相似文献
76.
Pelizzaro Filippo Kitenge Maria Piera Cardin Romilda Ponzoni Alberto Cillo Umberto Vitale Alessandro Businello Gianluca Munari Giada Fassan Matteo Farinati Fabio 《Clinical and experimental medicine》2021,21(4):675-682
Clinical and Experimental Medicine - We aimed to explore the activation of monoacylglycerol lipase (MAGL)/cyclooxygenase-2 (COX-2)/prostaglandin E2 (PGE2) axis in hepatocellular carcinoma (HCC),... 相似文献
77.
78.
Christenson Catherine Martinez-Vazquez Pablo Breidenstein Max Farhang Borzoo Mathews Jackson Melia Umberto Jensen Erik Weber Mathews Donald 《Journal of clinical monitoring and computing》2021,35(6):1421-1428
Journal of Clinical Monitoring and Computing - Comparison of two depth of anesthesia indices, qCON (Conox) and PSI (Sedline), during desflurane sedation and their sensitivity to random ketamine... 相似文献
79.
80.