全文获取类型
收费全文 | 52306篇 |
免费 | 4231篇 |
国内免费 | 1584篇 |
专业分类
耳鼻咽喉 | 617篇 |
儿科学 | 634篇 |
妇产科学 | 1086篇 |
基础医学 | 8150篇 |
口腔科学 | 1412篇 |
临床医学 | 4353篇 |
内科学 | 10007篇 |
皮肤病学 | 1000篇 |
神经病学 | 3759篇 |
特种医学 | 1692篇 |
外国民族医学 | 6篇 |
外科学 | 7301篇 |
综合类 | 3969篇 |
现状与发展 | 1篇 |
一般理论 | 5篇 |
预防医学 | 2955篇 |
眼科学 | 1373篇 |
药学 | 4714篇 |
中国医学 | 755篇 |
肿瘤学 | 4332篇 |
出版年
2023年 | 196篇 |
2022年 | 317篇 |
2021年 | 549篇 |
2020年 | 348篇 |
2019年 | 622篇 |
2018年 | 1125篇 |
2017年 | 868篇 |
2016年 | 862篇 |
2015年 | 966篇 |
2014年 | 1280篇 |
2013年 | 1576篇 |
2012年 | 2144篇 |
2011年 | 2079篇 |
2010年 | 1252篇 |
2009年 | 1233篇 |
2008年 | 1838篇 |
2007年 | 1948篇 |
2006年 | 1812篇 |
2005年 | 1490篇 |
2004年 | 1354篇 |
2003年 | 1326篇 |
2002年 | 1258篇 |
2001年 | 4627篇 |
2000年 | 4539篇 |
1999年 | 3905篇 |
1998年 | 1373篇 |
1997年 | 998篇 |
1996年 | 607篇 |
1995年 | 499篇 |
1994年 | 449篇 |
1993年 | 412篇 |
1992年 | 1931篇 |
1991年 | 1674篇 |
1990年 | 1527篇 |
1989年 | 1488篇 |
1988年 | 1296篇 |
1987年 | 1190篇 |
1986年 | 1063篇 |
1985年 | 899篇 |
1984年 | 588篇 |
1983年 | 467篇 |
1982年 | 249篇 |
1981年 | 180篇 |
1980年 | 141篇 |
1979年 | 280篇 |
1978年 | 77篇 |
1974年 | 75篇 |
1973年 | 95篇 |
1972年 | 71篇 |
1969年 | 66篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
我院耐甲氧西林金黄色葡萄球菌的耐药性及肠毒素分析 总被引:12,自引:0,他引:12
收集了我院1994年10月至1995年4月金黄色葡萄球菌100株,应用药敏试验筛选MRSA,并检测其对12种抗生素的耐药性,计算MIC50和MIC90,应用乳胶凝集试验法,测定其肠毒素产生率。结果我院总的MRSA阳性率为60%,烧伤科的MRSA的阳性率为67.4%,内科62.5%,骨科44.5%,MRSA耐药性低于50%的有万古霉素(3.3%)去甲万古霉素(5%),丁胺卡那霉素(21.5%)3种, 相似文献
72.
73.
74.
Twenty-one patients, under 6 years of age, with root avulsion of the brachial plexus were treated from 1975 to 1987. Among them, 9 had root avulsion of the upper trunk, 2 root avulsion of the lower trunk with middle trunk broken, and 10 root avulsion of the whole brachial plexus. Follow-up of 16 patients showed excellent results in 2 patients, good in 11, fair in 1 and poor in 2. It is suggested that good results can be obtained if multi-paired nerve transfer is adopted in treatment. We conclude that owing to anatomical and physiological characteristics of the respiratory system in children, it is harmful to perform phrenic nerve transfer concomitantly with intercostal nerve transfer. Advisably, two-stage operation is required, otherwise dyspnea and pneumonia are liable to occur. In addition, the time of the operation could be extended to 4-5 years after injury in children, but best results are obtained if the operation is performed within 1 year.
相似文献
75.
76.
H. -J. Möller H. M. van Praag B. Aufdembrinke P. Bailey T. R. E. Barnes J. Beck H. Bentsen F. X. Eich L. Farrow W. W. Fleischhacker J. Gerlach K. Grafford B. Hentschel A. Hertkorn S. Heylen Y. Lecrubier J. P. Leonard P. McKenna W. Maier V. Pedersen A. Rappard W. Rein J. Ryan M. Sloth Nielsen R. -D. Stieglitz G. Wegener J. Wilson 《Psychopharmacology》1994,115(1-2):221-228
There is little agreement about the methodology of clinical trials of antipsychotic drugs in patients with negative symptoms. A literature review revealed wide variation in experimental design, rating scales and study duration. This reflects differing views as to the definition and response to treatment of negative symptoms. Some degree of standardization would improve comparability of studies and aid the development of new compounds. Patients included in such studies should have displayed negative symptoms for at least 6 months. Depressive symptoms, positive schizophrenic symptoms and extrapyramidal signs may all influence or be confused with negative symptoms and may respond to treatment; they should be at a low level at baseline and should be measured during the study period. Studies should last at least 8 weeks. Several scales are available for measuring negative symptoms and are reviewed; a global impression score should be used additionally. 相似文献
77.
P Baquedano Droguett F X Wese G Verellen C Debauche P Clapuyt R Opsomer A Abi Aad P J Van Cangh L Van Obbergh F Veyckemans 《Acta urologica Belgica》1992,60(2):107-129
The Authors are reviewing their experience of Obstructive Uropathies diagnosed and treated surgically in neonates, the last 8 years in their Institution. 67 cases were reviewed, in which 37 presented with ureteropelvic junction obstruction (UPJ). 13 with posterior urethral valves, 11 with primary megaureter and 6 with ureterocele. Prenatal ultrasonography allowed the diagnosis to be made in two third of the patients. UPJ is the most common obstructive uropathy observed. Posterior urethral valves the most severe because of high pulmonary and renal (dysplasia) complication rate. Surgery, when indicated, has no more complications to be expected than in general population, if oriented prophylactic measures are taken in the early peri- and postoperative period. 相似文献
78.
Liver fibrosis was induced in rats by repeated peritoneal injections of carbon tetrachloride (CCl4) over a period of 2-11 weeks. Serum procollagen III peptide (SPIIINP), prolidase (SP) and alanine aminotransferase (SALT) levels were monitored during the period of induction. The extent of fibrosis was semi-quantitatively estimated after collagen staining, and the anti-fibrotic effects of 16,16-dimethyl prostaglandin E2 (DMPGE2), colchicine, and zinc sulphate were studied. SPIIINP and SP were increased the first 2 weeks after CCl4 administration and peaked at 6 weeks. Alterations in SPIIINP and SP correlated well to the semi-quantitative histological score of liver sections during the first 6 weeks, and SP was positively related to SPIIINP throughout the whole induction period. DMPGE2 decreased SPIIINP, SP and SALT significantly in addition to a markedly decreased formation of liver collagens. Colchicine had a similar but less dramatic effect, whereas zinc sulphate only reduced SPIIINP without influencing liver damage. In conclusion SPIIINP seems to be a valuable indicator of liver fibrogenesis, and SP may play a limited role in indicating accelerated collagen metabolism in the liver. DMPGE2 obviously inhibited the production of collagens induced by CCl4. Colchicine also had an apparent effect on liver fibrosis, whereas zinc sulphate merely seemed to postpone it. 相似文献
79.
In order to study the possible regressive changes of left ventricular hypertrophy in treated hypertensive patients and to correlate them either with the drugs they received and/or the blood pressure reduction obtained, a long-term (6 years) echocardiographic follow-up study was performed in 61 patients. B and M mode echocardiographic septum and posterior wall thickness and left ventricular mass index were measured yearly and the type of ventricular hypertrophy, asymmetric septal or concentric (symmetric), were compared before and after the follow-up. Sixteen patients received only diuretics; 14, only propranolol, and associated therapy was used in the remaining 31 patients. Average blood pressure was significantly reduced in the whole group of patients, but, individually, 30 of them achieved normal levels for the diastolic (90 mmHg), remaining it over this value in the other, although all of them experienced an average reduction 10 mmHg with therapy. Those patients with concentric hypertrophy at entry showed a significant septal, posterior wall thickness and total ventricular mass reduction during the follow-up, those with initial asymmetric septal hypertrophy, a significant septal thickness and ventricular mass reduction, and those without hypertrophy on admission, showed an average paradoxical increase in septal thickness. We conclude that left ventricular hypertrophy disappeared or decreased in 48% of the patients and that treatment seems to prevent its progression or development in the 43% of all patients. The regressive or favorable changes were significantly more frequent among patients with normal blood pressure after treatment as well as among patients treated only with propranolol in comparison to those treated only with diuretics. 相似文献
80.