全文获取类型
收费全文 | 27697篇 |
免费 | 1631篇 |
国内免费 | 67篇 |
专业分类
耳鼻咽喉 | 261篇 |
儿科学 | 793篇 |
妇产科学 | 819篇 |
基础医学 | 3556篇 |
口腔科学 | 1060篇 |
临床医学 | 3957篇 |
内科学 | 4754篇 |
皮肤病学 | 305篇 |
神经病学 | 2730篇 |
特种医学 | 531篇 |
外科学 | 2507篇 |
综合类 | 268篇 |
一般理论 | 35篇 |
预防医学 | 3948篇 |
眼科学 | 433篇 |
药学 | 1694篇 |
中国医学 | 85篇 |
肿瘤学 | 1659篇 |
出版年
2024年 | 21篇 |
2023年 | 196篇 |
2022年 | 362篇 |
2021年 | 616篇 |
2020年 | 421篇 |
2019年 | 614篇 |
2018年 | 736篇 |
2017年 | 556篇 |
2016年 | 604篇 |
2015年 | 729篇 |
2014年 | 979篇 |
2013年 | 1415篇 |
2012年 | 2089篇 |
2011年 | 2277篇 |
2010年 | 1193篇 |
2009年 | 1045篇 |
2008年 | 1836篇 |
2007年 | 2006篇 |
2006年 | 1837篇 |
2005年 | 1768篇 |
2004年 | 1731篇 |
2003年 | 1562篇 |
2002年 | 1532篇 |
2001年 | 323篇 |
2000年 | 222篇 |
1999年 | 249篇 |
1998年 | 289篇 |
1997年 | 248篇 |
1996年 | 170篇 |
1995年 | 196篇 |
1994年 | 173篇 |
1993年 | 129篇 |
1992年 | 135篇 |
1991年 | 131篇 |
1990年 | 95篇 |
1989年 | 94篇 |
1988年 | 79篇 |
1987年 | 73篇 |
1986年 | 55篇 |
1985年 | 83篇 |
1984年 | 66篇 |
1983年 | 59篇 |
1982年 | 67篇 |
1981年 | 60篇 |
1980年 | 38篇 |
1979年 | 44篇 |
1978年 | 26篇 |
1977年 | 23篇 |
1976年 | 19篇 |
1975年 | 16篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
62.
Deborah G Murdoch Eaton David Wertheim Rowena Oozeer Lilly MS Dubowitz Victor Dubowitz 《Acta paediatrica (Oslo, Norway : 1992)》1994,83(5):486-492
Murdoch Eaton DG, Wertheim D, Oozeer R, Dubowitz LMS, Dubowitz V. Reversible changes in cerebral activity associated with acidosis in preterm neonates. Acta Paediatr 1994;83:486–92. Stockholm. ISSN 0803–5253
Computerized online EEG monitoring in ventilated preterm infants less than 32 weeks' gestation enabled evaluation of the effect of acidosis on cerebral function. All episodes of acidosis were found to be associated with changes in the levels of cerebral activity. In 21 of the 32 episodes, EEG activity returned to pre-acidosis levels after therapeutic intervention. The duration of EEG abnormality was related to the severity of acidosis. However, the time to recovery of the EEG after therapeutic procedures was not related to duration of the EEG change. 相似文献
Computerized online EEG monitoring in ventilated preterm infants less than 32 weeks' gestation enabled evaluation of the effect of acidosis on cerebral function. All episodes of acidosis were found to be associated with changes in the levels of cerebral activity. In 21 of the 32 episodes, EEG activity returned to pre-acidosis levels after therapeutic intervention. The duration of EEG abnormality was related to the severity of acidosis. However, the time to recovery of the EEG after therapeutic procedures was not related to duration of the EEG change. 相似文献
63.
HLA-A, -B, -C, -DR, and -DQ typings of the Schmiedeleut Hutterites of South Dakota were collected as part of an ongoing genetic-epidemiologic study of HLA and fertility. A total of 1,082 individuals, including 852 married adults representative of the reproductive population of this isolate, were characterized for five-locus HLA haplotypes. HLA-A1, A2, A3, and A24 accounted for 75% of observed HLA-A alleles and HLA-B27, B35, B51, and B62 accounted for 55% of observed HLA-B alleles. S-leut Hutterites are derived from 68 or fewer ancestors. However, only 48 ancestral HLA haplotypes were observed and nine of these accounted for over 52% of the observed haplotypes. Measures of two-locus linkage disequilibrium derived from these haplotypes indicated that one-third to half of the observed HLA-A/B, B/DR, and A/DR allele combinations exhibited highly statistically significant linkage disequilibrium. Allele and haplotype frequencies did not differ between males and females. Recombination rates of 0.004% and 0.005% between HLA-A and -C and between HLA-B and -DR, respectively, were observed. This HLA profile points out a paucity of HLA alleles and haplotypes in this population and marked linkage disequilibrium among the HLA alleles that are present. © Wiley-Liss, Inc. 相似文献
64.
65.
Achiléa Lisboa Bittencourt M.D. Nubia Mendonça M.D. Luiz Antonio Rodrigues de Freitas M.D. Bertram Schnitzer 《Pediatric dermatology》1992,9(2):117-122
An 8-year-old boy was seen with a cutaneous Ki-1 anaplastic, large cell lymphoma with multiple lesions. Some of the lesions showed spontaneous regression. During more than seven years of disease no systemic involvement was observed, but recurrent, self-healing lesions did appear. Histopathologic examination of five lesions revealed a variety of findings, from an inflammatory infiltrate to a highly anaplastic pattern. The neoplastic cells expressed Ki-1 and leukocyte common antigens. Ultrastructurally, those cells showed ruffled indentations. The differential diagnosis includes microvillous malignant lymphoma. The patient has had a four-year follow-up without relapses. 相似文献
66.
67.
68.
69.
70.