全文获取类型
收费全文 | 2579235篇 |
免费 | 209208篇 |
国内免费 | 7692篇 |
专业分类
耳鼻咽喉 | 34508篇 |
儿科学 | 84883篇 |
妇产科学 | 72174篇 |
基础医学 | 360439篇 |
口腔科学 | 74585篇 |
临床医学 | 231228篇 |
内科学 | 512844篇 |
皮肤病学 | 58507篇 |
神经病学 | 211382篇 |
特种医学 | 104321篇 |
外国民族医学 | 720篇 |
外科学 | 395955篇 |
综合类 | 63515篇 |
现状与发展 | 5篇 |
一般理论 | 911篇 |
预防医学 | 205396篇 |
眼科学 | 57421篇 |
药学 | 187903篇 |
8篇 | |
中国医学 | 4587篇 |
肿瘤学 | 134843篇 |
出版年
2018年 | 25042篇 |
2016年 | 22795篇 |
2015年 | 26016篇 |
2014年 | 36149篇 |
2013年 | 54757篇 |
2012年 | 70218篇 |
2011年 | 74756篇 |
2010年 | 45562篇 |
2009年 | 43923篇 |
2008年 | 70816篇 |
2007年 | 75119篇 |
2006年 | 76635篇 |
2005年 | 74294篇 |
2004年 | 72179篇 |
2003年 | 69672篇 |
2002年 | 67159篇 |
2001年 | 120175篇 |
2000年 | 123861篇 |
1999年 | 104345篇 |
1998年 | 30391篇 |
1997年 | 27465篇 |
1996年 | 28113篇 |
1995年 | 27834篇 |
1994年 | 26146篇 |
1993年 | 24571篇 |
1992年 | 86973篇 |
1991年 | 84747篇 |
1990年 | 82067篇 |
1989年 | 78976篇 |
1988年 | 73468篇 |
1987年 | 72348篇 |
1986年 | 68530篇 |
1985年 | 66257篇 |
1984年 | 50216篇 |
1983年 | 42796篇 |
1982年 | 26057篇 |
1981年 | 23419篇 |
1980年 | 22063篇 |
1979年 | 46897篇 |
1978年 | 33313篇 |
1977年 | 28187篇 |
1976年 | 26224篇 |
1975年 | 27652篇 |
1974年 | 33302篇 |
1973年 | 32013篇 |
1972年 | 29480篇 |
1971年 | 27572篇 |
1970年 | 25304篇 |
1969年 | 23773篇 |
1968年 | 21862篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
982.
983.
Y. Graif A. Goldberg R. Tamir D. Vigiser S. Melamed 《Clinical and experimental allergy》2006,36(12):1532-1537
BACKGROUND: In allergic conditions, the degree of skin test reactivity does not always correlate with the severity of clinical symptoms. Additional factors may contribute to the reported symptom severity. OBJECTIVES: To investigate the association between the magnitude of the skin prick test (SPT) response and the reported symptom severity in patients with allergic rhinitis and the possible modifying role of psychological factors. METHODS: One hundred four patients with allergic rhinitis and 23 with non-allergic rhinitis, classified according to their SPT response to 19 aeroallergens, were asked to rate the severity of five symptoms and to indicate whether their symptoms intensified on exposure to five common aeroallergens. They also completed a psychological questionnaire. Results Reported symptom severity of allergic rhinitis did not correlate with weal size for any of the aeroallergens tested or with the number of positive responses on SPT. It was not related to patient age, sex, or education. The reported symptoms severity correlated positively (0.29, P < 0.01) with reported symptom intensification on exposure to allergens. Moreover, both outcomes were positively associated with the psychological factors of hypochondriasis (0.20, P < 0.05 and 0.18, P < 0.05, respectively), and somatic awareness (0.24, P < 0.05 and 0.33, P < 0.01, respectively), but not with neuroticism. CONCLUSIONS: The severity of symptoms experienced by patients with allergic rhinitis is apparently not related to the magnitude of SPT response, but rather to psychological factors of hypochondriasis and somatic awareness. Physicians should be aware of the contribution of psychological factors to patient perceptions of the intensity of symptoms and of the intensification of symptoms on their exposure to allergens. 相似文献
984.
985.
986.
987.
988.
989.
The study of the cognitive abilities of hearing-impaired children is important for both practical (e.g. to determine appropriate teaching strategies) and theoretical reasons (e.g. to examine the role of language in thought processes). The aim of this paper is to examine the cognitive function of hearing-impaired children from a review of the literature. If most studies show that deaf children are similar to normal children in virtually all aspects of cognitive function, many studies also emphasize pronounced differences in their academic achievement. Besides the degree of hearing loss and the age at onset of deafness, environmental factors (such as parental support and educational methods) seem to play an important role in the cognitive development and academic success of these children. This underlines the importance of the measures adopted for the deaf children as they may have a positive or negative impact on their development. 相似文献
990.
Guerard W. Byrne Johannes M. Schirmer David N. Fass Sumeet S. Teotia Walter K. Kremers Hui Xu Bashoo Naziruddin Henry D. Tazelaar John S. Logan Christopher G. A. McGregor 《American journal of transplantation》2005,5(5):1011-1020
Microvascular thrombosis is a prominent feature in cardiac delayed xenograft rejection (DXR). We investigated the impact of warfarin or low-molecular-weight heparin (LMWH) anti-coagulation on xenograft function using a heterotopic pig-to-primate model. Donor hearts were from CD46 transgenic pigs and baboon immunosuppression included tacrolimus, sirolimus, anti-CD20 and TPC, an alpha-galactosyl-polyethylene glycol conjugate. Three groups of animals were studied. Group 1 (n = 9) was treated with warfarin, Group 2 (n = 13) with LMWH and Group 3, received no anti-coagulant drugs. The median duration of xenograft function was 20 days (range 3-62 days), 18 days (range 5-109 days) and 15 days (range 4-53 days) in Groups 1 to 3 respectively. Anti-coagulation achieved the targeted international normalized prothrombin ratio (INR) and anti-factor Xa levels consistent with effective in vivo therapy yet, no significant impact on median xenograft function was observed. At rejection, a similar histology of thrombosis and ischemia was apparent in each group and the levels of fibrin deposition and platelet thrombi in rejected tissue was the same. Anti-coagulation with warfarin or LMWH did not have a significant impact on the onset of DXR and microvascular thrombosis. However, a role for specific anti-coagulant strategies to achieve long-term xenograft function cannot be excluded. 相似文献