全文获取类型
收费全文 | 2688346篇 |
免费 | 204064篇 |
国内免费 | 8508篇 |
专业分类
耳鼻咽喉 | 34831篇 |
儿科学 | 88171篇 |
妇产科学 | 72940篇 |
基础医学 | 375107篇 |
口腔科学 | 76177篇 |
临床医学 | 243110篇 |
内科学 | 534659篇 |
皮肤病学 | 62517篇 |
神经病学 | 214080篇 |
特种医学 | 104920篇 |
外国民族医学 | 504篇 |
外科学 | 412597篇 |
综合类 | 63731篇 |
现状与发展 | 6篇 |
一般理论 | 902篇 |
预防医学 | 207704篇 |
眼科学 | 61451篇 |
药学 | 193344篇 |
11篇 | |
中国医学 | 5917篇 |
肿瘤学 | 148239篇 |
出版年
2018年 | 29293篇 |
2017年 | 22480篇 |
2016年 | 25589篇 |
2015年 | 29006篇 |
2014年 | 40426篇 |
2013年 | 60052篇 |
2012年 | 78831篇 |
2011年 | 83875篇 |
2010年 | 50878篇 |
2009年 | 48301篇 |
2008年 | 77930篇 |
2007年 | 83035篇 |
2006年 | 84312篇 |
2005年 | 81001篇 |
2004年 | 77889篇 |
2003年 | 74767篇 |
2002年 | 71629篇 |
2001年 | 134521篇 |
2000年 | 138113篇 |
1999年 | 114590篇 |
1998年 | 32177篇 |
1997年 | 28360篇 |
1996年 | 29103篇 |
1995年 | 28622篇 |
1994年 | 26484篇 |
1993年 | 24658篇 |
1992年 | 90609篇 |
1991年 | 87848篇 |
1990年 | 84710篇 |
1989年 | 81202篇 |
1988年 | 74599篇 |
1987年 | 73222篇 |
1986年 | 68996篇 |
1985年 | 65940篇 |
1984年 | 49457篇 |
1983年 | 41768篇 |
1982年 | 24738篇 |
1981年 | 22195篇 |
1980年 | 20552篇 |
1979年 | 43996篇 |
1978年 | 31147篇 |
1977年 | 26529篇 |
1976年 | 24564篇 |
1975年 | 25738篇 |
1974年 | 30669篇 |
1973年 | 29535篇 |
1972年 | 27436篇 |
1971年 | 25258篇 |
1970年 | 23313篇 |
1969年 | 21869篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Klebsiella pneumoniae liver abscess associated with septic endophthalmitis is a rare observation. To our knowledge, only 10 cases have been reported in the international literature. We report a further case of complication occurring in an adult woman with hypothyroidism, and comment on the role of CT for the work-up. 相似文献
992.
993.
994.
R S Desowitz K K Shida L Pang G Buchbinder 《The American journal of tropical medicine and hygiene》1989,41(6):630-634
This study characterizes a Plasmodium berghei white rat model of P. falciparum malaria in the pregnant human. Seventy-day-old and 114-day-old female rats, given an infecting inoculum at time of mating, had higher parasitemias and a more severe anemia than age- and sex-matched controls. Under these experimental conditions, the parasitemia went to crisis in all animals and there were no fatal infections. In contrast, all animals died when the infection was initiated 7 days after conception, a timing that brought a coincidence of peak parasitemia and term. Pregnancy during the post-crisis subpatent period did not cause recrudescence. At the time of delivery, the parasitemia was consistently higher in the placental (crush smear) blood than in the peripheral (tail) blood. This difference was greatest in animals giving birth shortly before or 1-2 days after the parasitemic crisis. Very young, compact parasite forms predominated in the placental blood, whereas trophozoites predominated in the peripheral blood. 相似文献
995.
996.
997.
Mitogenic and protein synthetic activity of tissue repair cells: control by the postsurgical macrophage 总被引:3,自引:0,他引:3
M Fukasawa J D Campeau D L Yanagihara K E Rodgers G S Dizerega 《Journal of investigative surgery》1989,2(2):169-180
It is well known that fibroblasts are a main source of extracellular matrix synthesis necessary for tissue repair. In addition, macrophages secrete products that are known to modulate synthesis of extracellular matrix. Accordingly, we studied the incorporation of [3H]thymidine, [3H]proline, and [35S]sulfate into macromolecules produced by fibroblasts recovered from the site of peritoneal tissue repair cultured with and without spent media from postsurgical peritoneal macrophages. Rabbits underwent resection and reanastomosis of their small intestines. Peritoneal exudative cells (PEC) were then collected on postsurgical day 5 and day 10 as well as from nonsurgical controls, separated by discontinuous Percoll gradient centrifugation, and cultured for 48 h. A second group of rabbits underwent peritoneal wall abrasion from which fibroblast tissue repair cells (TRC) were collected from the site of injury at postsurgical day 7 and maintained in culture for varying times. Incorporation of radiolabeled precursors into DNA, collagen, and sulfated proteoglycans was determined. Incorporation of [3H]thymidine and [3H]proline into untreated TRC gradually decreased with culture duration. Conversely, [35S]sulfate incorporation gradually increased during prolonged culture. Macrophage spent media increased the levels of [3H]thymidine incorporation by the TRC. [3H]Proline and [35S]sulfate incorporation into TRC were also stimulated by macrophage spent media. However, this stimulation may be due to the enhanced proliferation of TRC by macrophage spent media. In conclusion, tissue repair fibroblasts are activated for postsurgical repair at the site of injury by many factors including secretory products from postsurgical macrophages. 相似文献
998.
999.
Biological fixation of porous-coated implants 总被引:1,自引:0,他引:1
R J Haddad S D Cook K A Thomas 《The Journal of bone and joint surgery. American volume》1987,69(9):1459-1466
1000.
Single course versus maintenance bacillus Calmette-Guerin therapy for superficial bladder tumors: a prospective, randomized trial 总被引:1,自引:0,他引:1
M A Hudson T L Ratliff D P Gillen E O Haaff S M Dresner W J Catalona 《The Journal of urology》1987,138(2):295-298
A total of 42 patients with recurrent superficial bladder tumors or carcinoma in situ entered a prospective, randomized trial to compare the efficacy of bacillus Calmette-Guerin therapy with and without quarterly maintenance instillations of bacillus Calmette-Guerin. Maintenance therapy did not reduce further bladder tumor recurrence rates or the interval to recurrence in patients who responded to the initial course of therapy. However, prolongation of toxicity was observed with maintenance bacillus Calmette-Guerin therapy. 相似文献