全文获取类型
收费全文 | 3287092篇 |
免费 | 232435篇 |
国内免费 | 5794篇 |
专业分类
耳鼻咽喉 | 47146篇 |
儿科学 | 104250篇 |
妇产科学 | 90938篇 |
基础医学 | 477749篇 |
口腔科学 | 93596篇 |
临床医学 | 292480篇 |
内科学 | 632028篇 |
皮肤病学 | 73549篇 |
神经病学 | 259696篇 |
特种医学 | 125219篇 |
外国民族医学 | 894篇 |
外科学 | 499324篇 |
综合类 | 71142篇 |
现状与发展 | 16篇 |
一般理论 | 1189篇 |
预防医学 | 248295篇 |
眼科学 | 78061篇 |
药学 | 246126篇 |
15篇 | |
中国医学 | 6806篇 |
肿瘤学 | 176802篇 |
出版年
2018年 | 34490篇 |
2017年 | 26354篇 |
2016年 | 29480篇 |
2015年 | 33130篇 |
2014年 | 46747篇 |
2013年 | 70809篇 |
2012年 | 96093篇 |
2011年 | 102251篇 |
2010年 | 60922篇 |
2009年 | 57933篇 |
2008年 | 96738篇 |
2007年 | 104017篇 |
2006年 | 104863篇 |
2005年 | 101902篇 |
2004年 | 97900篇 |
2003年 | 94639篇 |
2002年 | 92077篇 |
2001年 | 148902篇 |
2000年 | 152790篇 |
1999年 | 128999篇 |
1998年 | 37133篇 |
1997年 | 32789篇 |
1996年 | 32450篇 |
1995年 | 30775篇 |
1994年 | 28470篇 |
1993年 | 26828篇 |
1992年 | 100507篇 |
1991年 | 98088篇 |
1990年 | 95954篇 |
1989年 | 92905篇 |
1988年 | 85922篇 |
1987年 | 84504篇 |
1986年 | 79858篇 |
1985年 | 76597篇 |
1984年 | 57040篇 |
1983年 | 48635篇 |
1982年 | 29102篇 |
1981年 | 26252篇 |
1979年 | 53442篇 |
1978年 | 38300篇 |
1977年 | 32491篇 |
1976年 | 30466篇 |
1975年 | 33620篇 |
1974年 | 40138篇 |
1973年 | 38531篇 |
1972年 | 36487篇 |
1971年 | 34434篇 |
1970年 | 32152篇 |
1969年 | 30728篇 |
1968年 | 28418篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Epidemiology of chlamydial eye diseases in a mixed rural/urban population of West Germany 总被引:1,自引:0,他引:1
4260 conjunctival specimens of 2850 outpatients with keratoconjunctivitis of presumed infectious etiology were studied. Two thousand six hundred sixty-eight specimens (63%) revealed growth of bacteria, and 80 (2%) growth of fungi. One hundred ninety-nine specimens (5%) were McCoy cell culture or direct stain (monoclonal antibody or Giemsa) positive for Chlamydia trachomatis. two patients had a C. psittaci infection (ELISA techniques). In patients with keratoconjunctivitis of bacterial etiology, overall incidence of McCoy cell culture-proven chlamydial infections was 7%; in the 20 to 30-year age group it was 12.5%. Simultaneous infections of chlamydiae and other bacteria were seen in 34 patients. Since sensitive and specific tests to diagnose chlamydial infections are available, ophthalmologists may be able to prevent these infections by agent-specific antibiotic therapy. 相似文献
992.
Based on a standardized in-vitro method for quantifying the activity of prostaglandin-synthetase by means of coupling malondialdehyde with 2-thiobarbituric acid the possibility of using this method also as ex-vivo technique is described. By this, more favourable prerequisites to pharmacological valuation of the effects of potential antiinflammatory substances exists compared to the application of in-vitro results, only. 相似文献
993.
The Brief Symptom Inventory (BSI), a 53-item psychiatric symptom checklist, was administered to 57 alcoholic inpatients on days 2, 10, 18 and 26 of their 28-day stay in an alcoholism rehabilitation unit at a Veterans Administration hospital. The results of the test show a steady decline in the patients' psychiatric symptomatology from week 1 to week 4 with the most dramatic improvement evidenced between weeks 1 and 2. 相似文献
994.
The authors have presented the results of a 14-day open randomized trial of the efficacy of 3 calcium inlet blocking agents: nifedipine, verapamil and phendilin in 61 patients with Raynaud's syndrome. In the group of patients receiving 30-80 mg of nifedipine (20) there was a significant decrease in the frequency and expression of Raynaud's syndrome attacks, a positive effect of varying degree was noted in 19 patients. The drug raised slightly the skin and muscular blood flow and skin temperature. The use of 120-360 mg of verapamil in 21 patients caused no significant inhibition of Raynaud's syndrome and rise of hemocirculation. Phendilin (150-300 mg) though being comparable with nifedipine in efficacy, often produced side-effects resulting in the drug cancellation (8 out of 20). The efficacy of the calcium inlet blocking agents, especially nifedipine, for therapy of Raynaud's syndrome was emphasized. 相似文献
995.
Activity of newer beta-lactam agents against clinical isolates of Bacteroides fragilis and other Bacteroides species. 总被引:7,自引:4,他引:3 下载免费PDF全文
J P O''''Keefe F R Venezio C A DiVincenzo K L Shatzer 《Antimicrobial agents and chemotherapy》1987,31(12):2002-2004
The in vitro activities of beta-lactam antibiotics against Bacteroides fragilis and B. fragilis group isolates are presented. Clinical isolates from 1986 were compared with strains from 1979 to 1982. Imipenem, ticarcillin-clavulanic acid, and ceftizoxime were the most active agents. Cefotetan was equivalent to cefoxitin against B. fragilis but less active against B. fragilis group isolates. Enhancement of cefotaxime by its desacetyl metabolite was minimal. 相似文献
996.
997.
998.
999.
Edward H Szachowicz 《Otolaryngologic clinics of North America》2002,35(1):135-51, vii
Microepidermabrasion has become a common modality in aesthetic skin care in doctor's offices as well as in the hands of skin care specialists. The basics of particle beam resurfacing are discussed, with an emphasis on patient selection, technique, and after care. Concerns about current technology are reviewed, and insight into the evolution of new technologies is given. 相似文献
1000.