全文获取类型
收费全文 | 7974篇 |
免费 | 863篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 34篇 |
儿科学 | 295篇 |
妇产科学 | 179篇 |
基础医学 | 1191篇 |
口腔科学 | 149篇 |
临床医学 | 1041篇 |
内科学 | 1526篇 |
皮肤病学 | 107篇 |
神经病学 | 593篇 |
特种医学 | 539篇 |
外科学 | 928篇 |
综合类 | 222篇 |
一般理论 | 10篇 |
预防医学 | 841篇 |
眼科学 | 169篇 |
药学 | 562篇 |
中国医学 | 26篇 |
肿瘤学 | 434篇 |
出版年
2021年 | 90篇 |
2020年 | 66篇 |
2019年 | 106篇 |
2018年 | 130篇 |
2017年 | 108篇 |
2016年 | 124篇 |
2015年 | 116篇 |
2014年 | 178篇 |
2013年 | 266篇 |
2012年 | 385篇 |
2011年 | 367篇 |
2010年 | 240篇 |
2009年 | 194篇 |
2008年 | 374篇 |
2007年 | 421篇 |
2006年 | 364篇 |
2005年 | 330篇 |
2004年 | 312篇 |
2003年 | 270篇 |
2002年 | 247篇 |
2001年 | 246篇 |
2000年 | 237篇 |
1999年 | 221篇 |
1998年 | 154篇 |
1997年 | 122篇 |
1996年 | 114篇 |
1995年 | 86篇 |
1994年 | 101篇 |
1993年 | 70篇 |
1992年 | 186篇 |
1991年 | 179篇 |
1990年 | 178篇 |
1989年 | 187篇 |
1988年 | 162篇 |
1987年 | 163篇 |
1986年 | 156篇 |
1985年 | 164篇 |
1984年 | 71篇 |
1983年 | 106篇 |
1982年 | 63篇 |
1981年 | 59篇 |
1980年 | 75篇 |
1979年 | 83篇 |
1978年 | 59篇 |
1977年 | 68篇 |
1976年 | 80篇 |
1975年 | 74篇 |
1974年 | 70篇 |
1973年 | 79篇 |
1972年 | 59篇 |
排序方式: 共有8846条查询结果,搜索用时 169 毫秒
41.
P N Wells 《The British journal of radiology》1989,62(737):399-420
42.
N R Griffin D Dockey F A Lewis M Wells 《International journal of gynecological pathology》1991,10(1):36-43
There is evidence that cervical adenocarcinoma is increasing in incidence, particularly in young women. In order to assess the possible role of human papillomaviruses in cervical glandular oncogenesis, 16 cases of invasive adenocarcinoma and eight cases of adenocarcinoma in situ have been examined by in situ DNA hybridization using biotinylated probes to human papillomavirus types 6, 11, 16, 18, and 31, and assessed by polymerase chain reaction analysis for human papillomavirus types 11, 16, and 18 sequences. Of the invasive adenocarcinomas, four of 16 contained human papillomavirus type 16 sequences and one of 16 contained type 18 sequences as assessed by polymerase chain reaction analysis. Five of eight cases of adenocarcinoma in situ contained human papillomavirus type 16 sequences by polymerase chain reaction analysis. Only one invasive adenocarcinoma and one case of adenocarcinoma in situ showed a positive in situ hybridization signal. The low rate of carriage of the human papillomavirus sequences examined suggests that these viral types may not play a major role in cervical glandular neoplasia. 相似文献
43.
H Angus-Leppan GA Lambert J Michalicek 《Cephalalgia : an international journal of headache》1997,17(6):625-630
Co-existence of facial and occipital pain may occur in occipital neuralgia, migraine and cluster headache; suggesting convergence of trigeminal and cervical afferents. Such convergence has been shown in humans and other animals, but the site and extent of this are uncertain. In anaesthetized adult cats, the superior sagittal sinus and occipital nerve were stimulated electrically, and extracellular recordings made in the dorsolateral area of the upper cervical cord using glass-coated tungsten electrodes. Of 49 units in 10 cats, 33 (67%) had input from the superior sagittal sinus and the occipital nerve. Thirteen (27%) had superior sagittal sinus input and 3 (6%) had occipital nerve input. Convergent receptive fields were identified mechanically in 7 units. These experiments in cats show convergent input from occipital nerve and superior sagittal sinus on dorsolateral area units in two-thirds of cases studied. This experimental site of trigeminocervical convergence may relate to referral of pain in occipital neuralgia and other headaches. 相似文献
44.
45.
In patients with PG-dependent renal function, NSAID administration
constantly reduces GFR and RBF in a dose-dependent fashion. In this
situation, the risk of overt acute renal failure is high and should be
taken into proper account. In contrast, the incidence of NSAID-related
renal structural alterations appears to be very low, yet the absolute
number of patients may be significant considering the wide use of such
drugs. Concerning the antiproteinuric effect of NSAIDs, the unfavourable
ratio risk/benefit does not seem to support their indication in proteinuric
nephropathies. The development of PGHS-2 selective inhibitors is promising,
and may open new therapeutical strategies in the treatment of the
progression of renal disease.
相似文献
46.
The functioning and well-being of depressed patients. Results from the Medical Outcomes Study 总被引:47,自引:10,他引:37
K B Wells A Stewart R D Hays M A Burnam W Rogers M Daniels S Berry S Greenfield J Ware 《JAMA》1989,262(7):914-919
We describe the functioning and well-being of patients with depression, relative to patients with chronic medical conditions or no chronic conditions. Data are from 11,242 outpatients in three health care provision systems in three US sites. Patients with either current depressive disorder or depressive symptoms in the absence of disorder tended to have worse physical, social, and role functioning, worse perceived current health, and greater bodily pain than did patients with no chronic conditions. The poor functioning uniquely associated with depressive symptoms, with or without depressive disorder, was comparable with or worse than that uniquely associated with eight major chronic medical conditions. For example, the unique association of days in bed with depressive symptoms was significantly greater than the comparable association with hypertension, diabetes, and arthritis. Depression and chronic medical conditions had unique and additive effects on patient functioning. 相似文献
47.
48.
J R Smith C Wells M Jolly P Shah M Savage P Reginald V S Kitchen 《Sexually transmitted infections》1993,69(4):295-296
OBJECTIVE--It was hypothesised that the endometrium might act as a reservoir for candida, thus infecting the vagina as the endometrium is shed during menstruation. DESIGN--A prospective study of women with recurrent vulvo-vaginal candidiasis. The endometrium was sampled and cultured for candida species. SETTING--Central London STD clinic. SUBJECTS--26 women were enrolled, of whom 20 completed the study. RESULTS--One patient had a positive endometrial culture for candida species, the isolate being Candida krusei. CONCLUSIONS--The endometrium is not a common resevoir for candida species and therefore, infection at this site is an unlikely cause of recurrent vaginal candidiasis. 相似文献
49.
50.