全文获取类型
收费全文 | 8711篇 |
免费 | 735篇 |
国内免费 | 37篇 |
专业分类
耳鼻咽喉 | 55篇 |
儿科学 | 476篇 |
妇产科学 | 234篇 |
基础医学 | 985篇 |
口腔科学 | 182篇 |
临床医学 | 1011篇 |
内科学 | 1548篇 |
皮肤病学 | 82篇 |
神经病学 | 725篇 |
特种医学 | 559篇 |
外科学 | 1315篇 |
综合类 | 178篇 |
一般理论 | 2篇 |
预防医学 | 780篇 |
眼科学 | 181篇 |
药学 | 608篇 |
1篇 | |
中国医学 | 5篇 |
肿瘤学 | 556篇 |
出版年
2021年 | 108篇 |
2020年 | 70篇 |
2019年 | 107篇 |
2018年 | 139篇 |
2017年 | 102篇 |
2016年 | 112篇 |
2015年 | 133篇 |
2014年 | 154篇 |
2013年 | 286篇 |
2012年 | 296篇 |
2011年 | 341篇 |
2010年 | 195篇 |
2009年 | 210篇 |
2008年 | 314篇 |
2007年 | 356篇 |
2006年 | 370篇 |
2005年 | 314篇 |
2004年 | 304篇 |
2003年 | 288篇 |
2002年 | 277篇 |
2001年 | 300篇 |
2000年 | 304篇 |
1999年 | 292篇 |
1998年 | 223篇 |
1997年 | 199篇 |
1996年 | 196篇 |
1995年 | 157篇 |
1994年 | 156篇 |
1993年 | 159篇 |
1992年 | 207篇 |
1991年 | 195篇 |
1990年 | 196篇 |
1989年 | 188篇 |
1988年 | 196篇 |
1987年 | 151篇 |
1986年 | 174篇 |
1985年 | 164篇 |
1984年 | 148篇 |
1983年 | 119篇 |
1982年 | 81篇 |
1981年 | 93篇 |
1980年 | 66篇 |
1979年 | 115篇 |
1978年 | 77篇 |
1977年 | 83篇 |
1976年 | 64篇 |
1975年 | 76篇 |
1974年 | 74篇 |
1973年 | 77篇 |
1972年 | 62篇 |
排序方式: 共有9483条查询结果,搜索用时 0 毫秒
31.
32.
Rosenberg ZS; Jahss MH; Noto AM; Shereff MJ; Cheung Y; Frey CC; Norman A 《Radiology》1988,167(2):489-493
Computed tomography (CT) was performed in 42 patients with 49 clinically suspected tears of the posterior tibial tendon. Twenty-eight of the 49 suspected tears were subsequently surgically explored and repaired. Three patterns of tendon abnormalities were recognized on CT scans: type I-intact, hypertrophied, heterogeneous tendon; type II-attenuated tendon; and type III-absence of a portion of a tendon. Types I and II correlated with partial rupture seen during surgery, and type III correlated with complete rupture of the tendon. CT findings were accurate in 96% of the patients who underwent surgery. In four cases (14%), tendon rupture was seen on CT scans, but the extent of the injury was underestimated and the rupture was misclassified. Reactive periostitis of the distal tibia was seen in 71% of diseased tendons and may represent an important factor in the diagnosis of tendon rupture. 相似文献
33.
34.
35.
LN Weinberger MJ Zirwas JC English III 《Journal of the European Academy of Dermatology and Venereology》2007,21(2):156-162
Male genital oedema can be defined as swelling or the appearance of swelling of the scrotum and/or the penile shaft and prepuce. Despite the various causes of genital oedema reported in the published work, a concise approach to the evaluation and management has not been sufficiently addressed. 相似文献
36.
37.
Kenneth W. Locke Robert W. Dunn John W. Hubbard Cheri L. Vanselous Michael Cornfeldt Stuart Fielding Joseph T. Strupczewski 《Drug development research》1990,19(3):239-256
HP 818 (1-benzoyl-6-fluoro-3-(1-methyl-4-piperidinyl)-1H-indazole) exhibits the profile of a potent nonnarcotic analgesic with neuroleptic properties. HP 818 blocks the effects of chemical (phenylquinone), pressure (tail clip), and radiant heat (tail flick) painful stimuli in mice (ED50 values of 0.3, 1.2, and 4.1 mg/kg s.c., respectively). This compound displays antinociceptive activity by the subcutaneous, oral, and intravenous routes of administration. It is also effective in the shock titration assay in squirrel monkeys and in a model of surgically induced pain. The rank order of potency of HP 818 and several other standard compounds in these tests for analgesia was Innovar > fentanyl > HP 818 > codeine > droperidol. In addition to its antinociceptive effects, HP 818 possesses neuroleptic properties. It is active in the climbing mouse, pole climb avoidance, and intracranial self-stimulation assays (ED50 values of 1.8, 1.7, and 2.5 mg/kg i.p., respectively). Moreover, HP 818 inhibits amphetamine- and apomorphine-induced stereotypy, indicative of D2-dopaminergic blocking properties. HP 818, unlike typical neuroleptic agents, does not induce supersensitivity to the effects of apomorphine when administered chronically in mice. In contrast to the clinical standard neuroleptanalgesic Innovar, HP 818 (1.0–3.0 mg/kg i.v.) produces no significant cardiovascular or respiratory changes in the anesthetized dog. Thus, HP 818 is potentially an effective presurgical medication due to its nonnarcotic analgesic activity and sedative neuroleptic effects, along with its lack of limiting cardiorespiratory side effects. 相似文献
38.
Picotamide inhibition of excess in vitro thromboxane B2 release by colorectal mucosa in inflammatory bowel disease. 总被引:1,自引:0,他引:1
Collins CE Benson MJ Burnham WR Rampton DS 《Alimentary pharmacology & therapeutics》1996,10(3):315-320
BACKGROUND: Inflammatory bowel disease is associated with increased mucosal release of eicosanoids. Among these, thromboxane A2 has been proposed as a possible inflammatory mediator; its suppression may be a useful therapeutic option. METHODS: Using a tissue incubation technique, we compared release of immunoreactive thromboxane B2 by colonic biopsies from patients with ulcerative colitis, Crohn's disease and controls, and assessed the inhibitory effect of picotamide, a thromboxane synthesis inhibitor-receptor antagonist, which has been widely used in Italy for management of ischaemic heart and cerebrovascular disease. RESULTS: Increased amounts of thromboxane B2 were released from biopsies from patients with active ulcerative colitis (median 238 pg/20 min/mg wet weight (interquartile range 147- 325), n = 12) and active Crohn's disease (252 (174-450), 6) compared with those from patients with quiescent ulcerative colitis (95 (61- 140), 12) or Crohn's disease (105 (57-201), 13), or controls (136 (64- 206), 8). Incubation with picotamide at concentrations between 100 microM and 1 mM reduced thromboxane B2 release (IC50 890 microM). CONCLUSION: Since increased thromboxane A2 production may have pathogenetic importance, thromboxane synthesis inhibitor-receptor antagonists such as picotamide merit therapeutic trial in the management of inflammatory bowel disease. 相似文献
39.
M D Schulman C T Evensen C W Runyan L R Cohen K A Dunn 《The Journal of rural health》1997,13(4):295-305
Children who work in agriculture suffer more than 23,000 injuries and 300 fatalities on American farms every year. Using survey data collected from a random sample of working teens (ages 14 to 17) in North Carolina, the authors analyze the farm-based hazard exposure and injury experiences of teens who work on farms. The group of farmworking teens (N = 141) is 72 percent male, has a mean age of 16.6 years, and is, on average, in the 10th grade. The data show that teens working on farms in North Carolina are exposed to significant safety hazards throughout their farmworking careers. A majority of the respondents in this group of farmworkers reported exposure to tractors, large animals, all-terrain vehicles, farm trucks, and rotary mowers, and more than one-third reported exposure to pesticides and tobacco harvesters. Common reported injuries include insect stings, cuts, burns, and falls. The researchers find that gender, age, and farmwork experiences are related to variations in types of hazards to which teens are exposed and in the types of injuries they suffer. These variables also are related to the overall complexity of the teens' farmwork experiences and the burden of injury endured by teens. 相似文献
40.