全文获取类型
收费全文 | 46446篇 |
免费 | 2763篇 |
国内免费 | 114篇 |
专业分类
耳鼻咽喉 | 677篇 |
儿科学 | 2101篇 |
妇产科学 | 1068篇 |
基础医学 | 5690篇 |
口腔科学 | 1939篇 |
临床医学 | 4432篇 |
内科学 | 9523篇 |
皮肤病学 | 1142篇 |
神经病学 | 3865篇 |
特种医学 | 1416篇 |
外国民族医学 | 2篇 |
外科学 | 7125篇 |
综合类 | 170篇 |
一般理论 | 17篇 |
预防医学 | 3086篇 |
眼科学 | 1321篇 |
药学 | 3029篇 |
中国医学 | 184篇 |
肿瘤学 | 2536篇 |
出版年
2024年 | 44篇 |
2023年 | 354篇 |
2022年 | 325篇 |
2021年 | 835篇 |
2020年 | 567篇 |
2019年 | 889篇 |
2018年 | 1387篇 |
2017年 | 993篇 |
2016年 | 1111篇 |
2015年 | 1129篇 |
2014年 | 1401篇 |
2013年 | 2113篇 |
2012年 | 3277篇 |
2011年 | 3685篇 |
2010年 | 1918篇 |
2009年 | 1400篇 |
2008年 | 3126篇 |
2007年 | 3362篇 |
2006年 | 3253篇 |
2005年 | 3284篇 |
2004年 | 3175篇 |
2003年 | 2912篇 |
2002年 | 2796篇 |
2001年 | 928篇 |
2000年 | 1009篇 |
1999年 | 672篇 |
1998年 | 393篇 |
1997年 | 320篇 |
1996年 | 258篇 |
1995年 | 231篇 |
1994年 | 196篇 |
1993年 | 180篇 |
1992年 | 156篇 |
1991年 | 132篇 |
1990年 | 123篇 |
1989年 | 115篇 |
1988年 | 102篇 |
1987年 | 88篇 |
1986年 | 99篇 |
1985年 | 67篇 |
1984年 | 81篇 |
1983年 | 73篇 |
1982年 | 68篇 |
1981年 | 53篇 |
1980年 | 61篇 |
1979年 | 72篇 |
1978年 | 55篇 |
1977年 | 53篇 |
1974年 | 45篇 |
1973年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
122.
Taking advantage of two large, population-based, and longitudinal datasets collected after the 1999 floods in Mexico (n = 561) and the September 11, 2001 terrorist attacks in New York (n = 1267), we examined the notion that resilience may be best understood and measured as one member of a set of trajectories that may follow exposure to trauma or severe stress. We hypothesized that resistance, resilience, recovery, relapsing/remitting, delayed dysfunction, and chronic dysfunction trajectories were all possible in the aftermath of major disasters. Semi-parametric group-based modeling yielded the strongest evidence for resistance (no or mild and stable symptoms), resilience (initially moderate or severe symptoms followed by a sharp decrease), recovery (initially moderate or severe symptoms followed by a gradual decrease), and chronic dysfunction (moderate or severe and stable symptoms), as these trajectories were prevalent in both samples. Neither Mexico nor New York showed a relapsing/remitting trajectory, and only New York showed a delayed dysfunction trajectory. Understanding patterns of psychological distress over time may present opportunities for interventions that aim to increase resilience, and decrease more adverse trajectories, after mass traumatic events. 相似文献
123.
124.
A. Barutçu 《European journal of plastic surgery》1994,17(3):118-120
Summary In 1982, Dibbell described a procedure to correct this distortion by rotating and advancing the nostril medially and superiorly. We used this method in our department for several years, but as Dibbell himself experienced, we didn't always obtain satisfactory results. Like many authors, I agree that the best approach for proper correction of the secondary unilateral cleft lip nose deformity is the external approach using transcolumellar incisions, because the lower lateral cartilage exposure is inadequate with Dibbell's method. I added the transcolumellar incision similar to Bardach's to solve this problem. In this paper, this combination technique will be presented and contrasted with Dibbell's and Bardach's techniques. 相似文献
125.
126.
Selective laser trabeculoplasty in phakic and pseudophakic eyes. 总被引:2,自引:0,他引:2
BACKGROUND AND OBJECTIVE: To evaluate the effect of pseudophakia on the success of selective laser trabeculoplasty in lowering intraocular pressure (IOP). PATIENTS AND METHODS: In this retrospective, nonrandomized clinical trial, a chart review of all patients who underwent selective laser trabeculoplasty from September 2002 to June 2004 using a frequency-doubled Q-switched 532-nm Nd:YAG laser was performed. Changes in IOP and statistical significance were determined at each follow-up period. Average decrease in IOP and success rates for phakic and pseudophakic eyes were compared statistically at each time period. RESULTS: In the phakic group, mean IOP decreased from 18.1 to 15.5 mm Hg (P < .0005) and mean glaucoma medication use decreased from 2.1 to 1.6 medications after 24 months of follow-up. In the pseudophakic group, mean IOP decreased from 18.3 to 15.2 mm Hg (P < .005) and mean glaucoma medication use decreased from 2.2 to 1.6 medications. Success rates ranged from 54% to 67% in the phakic group and 52% to 65% in the pseudophakic group. No statistically significant difference between phakic and pseudophakic eyes in decreased IOP or success rates was seen at any time point (P > .05). No significant complications occurred in either group. CONCLUSIONS: Selective laser trabeculoplasty is effective in lowering IOP in both phakic and pseudophakic patients. 相似文献
127.
Farida Daïkha-Dahmane Françoise Narcy Marc Dommergues Mireille Lacoste Agnes Beziau Marie-Claire Gubler 《Pediatric nephrology (Berlin, Germany)》1997,11(3):267-273
An alteration in cell/matrix interactions is one of the suggested mechanisms leading to cyst formation in polycystic kidney
diseases. Most of these interactions are mediated by β1-integrins, a subfamily of integrin receptors, formed by the association
of the β1-chain with different α-subunits. To date, no study on α-integrin subunit distribution during the early stages of
cyst development has been reported. Using immunofluorescence, we analyzed the distribution of α-integrin subunits (α1, α2,
α3, α5, and α6) and basement membrane proteins in kidneys of fetuses with autosomal dominant (ADPKD) or autosomal recessive
polycystic kidney disease (ARPKD). The distribution was compared with that observed in normal fetal and post-natal kidneys,
and in fetal cystic dysplasia and Meckel syndrome. Marked increase in α1-integrin staining was observed in normal and cystic
collecting duct cells of both polycystic diseases (PKD), compared with normal and cystic controls. The distribution of integrin
subunits α2, α3, and α6 was irregular in cyst epithelial cells of PKD and cystic controls. The increased expression of the
α1-subunit specifically observed in PKD collecting duct cells may be an early consequence of the genetic defect in ARPKD.
In ADPKD it parallels the reported expression of polycystin, the protein product of PKD1. The irregular expression of α2,
α3, and α6 integrin subunits observed in all types of cysts suggests that cell/matrix interactions are altered early and may
participate in the development of cysts, perhaps by contributing to the deregulation of cell survival in cystic diseases.
Received May 28, 1996; received in revised form October 2, 1996; accepted October 25, 1996 相似文献
128.
A. C. Iplikçioğlu M. A. Bayar F. Kökeş B. Yildiz C. Gökçek Z. Buharali 《Neuroradiology》1994,36(1):31-32
We report a fluid level in an acute extradural haematoma developing after placement of a ventriculoperitoneal shunt for hydrocephalus. This fluid level was thought to be due to a mixture of blood and cerebrospinal fluid. 相似文献
129.
Methotrexate for the treatment of unruptured tubal pregnancy: a prospective nonrandomized study. 总被引:3,自引:0,他引:3
Amélie Gervaise Sylvie Capella-Allouc Fran?ois Audibert Catherine Rongières-Bertrand Yves Vincent Hervé Fernandez 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2003,7(3):233-238
BACKGROUND AND OBJECTIVES: The aim of this study was to compare in a prospective nonrandomized study, the efficacy of 2 methods of administering methotrexate (MTX) in the treatment of ectopic pregnancy (EP): transvaginal injection under sonographic control or intramuscular injection (IM). METHODS: Patients with EP who met specific inclusion criteria for medical treatment were treated with MTX: 63 patients (group 1) were treated by IM and 47 patients (group 2) by transvaginal local injection. In group 1, 50 mg/m2 of MTX was injected intramuscularly; in group 2, transvaginal injection of 1 mg/kg of MTX was injected into the ectopic sac under sonographic control. When an additional dose of MTX was required, it was administrated IM at the dosage of 50 mg/m2 in both groups. RESULTS: The overall success rate, defined by a posttreatment normal hCG level (< 10 mUI/mL) was 71.4% in group 1 versus 91.5% in group 2 (P < 0.01); for patients with hCG levels < 2000 mUI/mL, 83% and 96%, respectively (not significant); for patients with hCG > or = 2000 mUI/mL, 37.5% and 86.4%, respectively (P < 0.01). CONCLUSION: In the medical treatment of EP, the efficacy of MTX is greater when administered by local transvaginal injection than by IM injection. We propose local treatment every time EP can be punctured, especially when hCG levels are > or = 2000 mUI/mL. 相似文献
130.