全文获取类型
收费全文 | 4979篇 |
免费 | 330篇 |
国内免费 | 34篇 |
专业分类
耳鼻咽喉 | 59篇 |
儿科学 | 221篇 |
妇产科学 | 123篇 |
基础医学 | 612篇 |
口腔科学 | 168篇 |
临床医学 | 451篇 |
内科学 | 1040篇 |
皮肤病学 | 159篇 |
神经病学 | 394篇 |
特种医学 | 430篇 |
外科学 | 717篇 |
综合类 | 39篇 |
预防医学 | 259篇 |
眼科学 | 77篇 |
药学 | 272篇 |
1篇 | |
中国医学 | 6篇 |
肿瘤学 | 315篇 |
出版年
2023年 | 18篇 |
2022年 | 45篇 |
2021年 | 81篇 |
2020年 | 63篇 |
2019年 | 69篇 |
2018年 | 91篇 |
2017年 | 79篇 |
2016年 | 73篇 |
2015年 | 99篇 |
2014年 | 125篇 |
2013年 | 197篇 |
2012年 | 221篇 |
2011年 | 235篇 |
2010年 | 185篇 |
2009年 | 145篇 |
2008年 | 178篇 |
2007年 | 231篇 |
2006年 | 207篇 |
2005年 | 226篇 |
2004年 | 195篇 |
2003年 | 171篇 |
2002年 | 173篇 |
2001年 | 156篇 |
2000年 | 178篇 |
1999年 | 149篇 |
1998年 | 133篇 |
1997年 | 114篇 |
1996年 | 84篇 |
1995年 | 79篇 |
1994年 | 64篇 |
1993年 | 67篇 |
1992年 | 102篇 |
1991年 | 124篇 |
1990年 | 107篇 |
1989年 | 113篇 |
1988年 | 111篇 |
1987年 | 100篇 |
1986年 | 77篇 |
1985年 | 71篇 |
1984年 | 40篇 |
1983年 | 44篇 |
1982年 | 32篇 |
1981年 | 25篇 |
1980年 | 29篇 |
1979年 | 23篇 |
1978年 | 26篇 |
1977年 | 24篇 |
1976年 | 20篇 |
1974年 | 18篇 |
1973年 | 18篇 |
排序方式: 共有5343条查询结果,搜索用时 62 毫秒
21.
P Barillari I A Muttillo I Cioè R Caronna M Ricci P Sammartino 《Minerva chirurgica》1992,47(20):1665-1670
Pleural mesotheliomas are rare, and their diagnosis and treatment not clear. The case observed in our Department leads us to an analysis of the literature. This showed that differential diagnosis with pulmonary carcinoma is very difficult, even in cases of parietal mesothelioma; however local treatment may be performed even in malignant mesothelioma. 相似文献
22.
G Belcaro M R Cesarone P Rohdewald A Ricci E Ippolito M Dugall M Griffin I Ruffini G Acerbi M G Vinciguerra P Bavera A Di Renzo B M Errichi F Cerritelli 《Clinical and applied thrombosis/hemostasis》2004,10(4):373-377
The aim of this study was to evaluate the occurrence of deep venous thrombosis (DVT) and superficial vein thrombosis (SVT) and its prophylaxis with an oral anti-edema and antithrombotic agent (Pycnogenol, Horphag, Research Management SA, Geneva, Switzerland) in long-haul flights, in subjects at moderate to high-risk of DVT and SVT. The study pre-included 244 pre-selected subjects; 211 were included (33 were excluded for several reasons due to logistic problems) and 198 completed the study; 13 subjects were lost for follow-up at the end of the flight, all for non-medical problems (i.e., for difficult connections). All subjects were scanned within 90 minutes before the flight and within 2 hours after disembarking. Subjects were supplemented with 100 mg Pycnogenol per capsule. Treatment subjects received two capsules between 2 and 3 hours before flights with 250 mL of water; two capsules were taken 6 hours later with 250 mL of water and one capsule the next day. The control group received comparable placebo at the same intervals. The flight duration was on average 8 hours and 15 minutes (SD 55 min) (range, 7.45-12.33). In the control group there were five thrombotic events (one DVT and four superficial thromboses) while only nonthrombotic, localized phlebitis was observed in the Pycnogenol group (5.15% vs. no events; p<0.025). The ITT (intention to treat) analysis detects 13 failures in the control group (eight lost to follow up + five thrombotic events) of 105 subjects (12.4%) vs. five failures (4.7%; all lost, no thrombotic events) in the treatment group (p<0.025). No unwanted effects were observed. In conclusion, this study indicates that Pycnogenol treatment was effective in decreasing the number of thrombotic events (DVT and SVT) in moderate-to-high risk subjects, during long-haul flights. 相似文献
23.
Kuntal Patel Deemesh Oudit G Ross Caroline Nicolson AJ Howcroft 《CANADIAN JOURNAL OF PLASTIC SURGERY》2005,13(4):207-208
A lump on the midface of a child can pose as a diagnostic dilemma. There is a wide variety of possible differential diagnoses, ranging from simple benign conditions such as a sebaceous cyst, dermoid cyst, lipoma, neuroma and neurofibroma, to potentially devastating conditions such as odontogenic myxoma.A case of a child in which the formulation of a definite diagnosis was clinically and histologically challenging is presented. 相似文献
24.
25.
26.
Lesley A Ricci Daniel F Connor Randall Morrison Richard H Melloni 《Neuropsychopharmacology》2007,62(3):218-225
BACKGROUND: Risperidone has been shown to be clinically effective for the treatment of aggressive behavior in children, yet no information is available regarding whether risperidone exhibits aggression-specific suppression in preclinical studies that use validated developmentally immature animal models of escalated aggression. Previously, we have shown that exposure to low doses of the psychostimulant cocaine-hydrochloride (.5 mg/kg intraperitoneally) during the majority of pubertal development (postnatal days [P]27-57) generates animals that exhibit a high level of offensive aggression. This study examined whether risperidone exerts selective aggression-suppressing effects by using this pharmacologic animal model of highly escalated offensive aggression. METHODS: Experimental hamsters were tested for offensive aggression after the acute administration of risperidone (.05-1.0 mg/kg, intraperitoneally). RESULTS: Risperidone dose-dependently reduced the highly aggressive phenotype, with a significant reduction observed at .1-.2 mg/kg for most aggressive responses measured. Experimental animals treated with higher doses of risperidone (.3-1.0 mg/kg) showed significant reductions in aggression and social interest toward intruders, indicating more general behavioral inhibition. CONCLUSIONS: These studies provide evidence that risperidone exerts specific aggression-suppressing effects in a developmentally immature animal model of escalated aggression. 相似文献
27.
28.
Low day 3 luteinizing hormone values are predictive of reduced response to ovarian stimulation 总被引:7,自引:4,他引:3
Noci I; Biagiotti R; Maggi M; Ricci F; Cinotti A; Scarselli G 《Human reproduction (Oxford, England)》1998,13(3):531-534
The aim of the present work was to evaluate whether low day 3 luteinizing
hormone (LH) values in the presence of normal follicle stimulating hormone
(FSH) are predictive of poor response to ovarian stimulation. Two groups of
women undergoing ovarian stimulation and differing only in the day 3 LH
concentration (<3 mIU/ml, study group, n=30; >3 mIU/ml, control
group, n=45) were retrospectively analysed. Study group patients developed
a lower oestradiol peak (703+/-388 versus 955+/-400 ng/ml; P = 0.005) and a
lower number of follicles >15 mm diameter at the time of human chorionic
gonadotrophin (HCG) administration (2.6+/-1.3 versus 3.6+/-1.8; P=0.004)
than the control group. Conversely, a similar ratio of oestradiol:
follicles >15 mm diameter was observed (256+/-118 versus 269+/-93;
P=0.563). The number of follicles >10 mm at the time of HCG
administration appeared to be lower in the study group, but this difference
was not statistically significant (6+/-3.9 versus 7.8+/-4.3). Our data
indicate that day 3 LH values <3 mIU/ml are predictive of poor response
to ovarian stimulation.
相似文献
29.
30.