全文获取类型
收费全文 | 199632篇 |
免费 | 10730篇 |
国内免费 | 2041篇 |
专业分类
耳鼻咽喉 | 2710篇 |
儿科学 | 5611篇 |
妇产科学 | 4071篇 |
基础医学 | 25372篇 |
口腔科学 | 6953篇 |
临床医学 | 15124篇 |
内科学 | 46065篇 |
皮肤病学 | 5544篇 |
神经病学 | 14661篇 |
特种医学 | 4598篇 |
外国民族医学 | 7篇 |
外科学 | 24474篇 |
综合类 | 6910篇 |
现状与发展 | 2篇 |
一般理论 | 53篇 |
预防医学 | 18406篇 |
眼科学 | 4574篇 |
药学 | 14716篇 |
53篇 | |
中国医学 | 2957篇 |
肿瘤学 | 9542篇 |
出版年
2023年 | 1562篇 |
2022年 | 2631篇 |
2021年 | 5900篇 |
2020年 | 3559篇 |
2019年 | 5125篇 |
2018年 | 7240篇 |
2017年 | 4899篇 |
2016年 | 4561篇 |
2015年 | 5565篇 |
2014年 | 7085篇 |
2013年 | 9416篇 |
2012年 | 15375篇 |
2011年 | 16162篇 |
2010年 | 9123篇 |
2009年 | 7118篇 |
2008年 | 12431篇 |
2007年 | 12979篇 |
2006年 | 11926篇 |
2005年 | 11455篇 |
2004年 | 9883篇 |
2003年 | 9244篇 |
2002年 | 8379篇 |
2001年 | 4416篇 |
2000年 | 4918篇 |
1999年 | 3789篇 |
1998年 | 1011篇 |
1997年 | 748篇 |
1996年 | 692篇 |
1995年 | 574篇 |
1994年 | 450篇 |
1993年 | 374篇 |
1992年 | 1447篇 |
1991年 | 1196篇 |
1990年 | 1053篇 |
1989年 | 860篇 |
1988年 | 735篇 |
1987年 | 709篇 |
1986年 | 711篇 |
1985年 | 619篇 |
1984年 | 484篇 |
1983年 | 392篇 |
1979年 | 402篇 |
1975年 | 303篇 |
1974年 | 347篇 |
1973年 | 384篇 |
1972年 | 318篇 |
1971年 | 333篇 |
1970年 | 310篇 |
1969年 | 310篇 |
1968年 | 278篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Marina H C G Magalh?es Cristiane Barbosa da Silveira Carla Ruffeil Moreira Marcelo Gusm?o Paraíso Cavalcanti 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2007,103(6):836-842
Mandibulofacial dysostosis (Treacher Collins Syndrome) is an autosomal dominant genetic disorder that probably derives from inhibition of the facial structures from the first and second branchial arches. The facial pattern of the syndrome is a convex facial profile with a prominent nose above a retruded chin. The eyes are deformed by antimongoloid slant of the palpebral fissures and facial bones are hypoplastic. The alterations are caused by mutation in gene 5q32-33.1, which encodes the nucleolar phosphoprotein treacle. Computed tomography images are able to demonstrate craniofacial bones, allowing the morphological analysis of these bones in individuals with complex deformities. The purpose of this paper is to present the results of a clinical and computed tomography investigation of two patients with Treacher Collins syndrome. 相似文献
92.
Robotic-assisted heller myotomy versus laparoscopic heller myotomy for the treatment of esophageal achalasia: multicenter study 总被引:3,自引:0,他引:3
Santiago Horgan M.D. Carlos Galvani M.D. Maria V. Gorodner M.D. Pablo Omelanczuck M.D. Fernando Elli M.D. Federico Moser M.D. Luis Durand M.D. Miguel Caracoche M.D. Jorge Nefa M.D. Sergio Bustos M.D. Phillip Donahue M.D. Pedro Ferraina M.D. 《Journal of gastrointestinal surgery》2005,9(8):1020-1030
Laparoscopic Heller myotomy (LHM) has become the standard treatment option for achalasia. The incidence of esophageal perforation
reported is about 5%–10%. Robotically assisted Heller myotomy (RAHM) is emerging as a safe alternative to LHM. Data comparing
the two approaches are scant. The aim of this study was to compare RAHM with LHM in terms of efficacy and safety for treatment
of achalasia. A total of 121 patients underwent surgical treatment of achalasia at three institutions. A retrospective review
of prospectively collected perioperative data was performed. Patients were divided into two groups: group A (RAHM), 59 patients,
and group B (LHM), 62 patients. All the operations were completed using minimally invasive techniques. There were 63 women
and 58 men, with a mean age of 45 ±19 years (14–82 years). Fifty-one percent of patients in group A and 95% of patients in
group B reported weight loss. Duration of symptoms was equal for both groups. Dysphagia was the main complaint in both groups
(P = NS). There was no difference in preoperative endoscopic treatment in both groups (44% versus 27%, P = NS). Operative
time was significantly shorter for LHM in the first half of the experience (141 ± 49 versus 122 ± 44 minutes, P < .05). However,
in the last 30 cases there was no difference in operative time between the groups (P = NS). Intraoperative complications (esophageal
perforation) were more frequent in group B (16% versus 0%). The incidence of postoperative heartburn did not differ by group.
There were no deaths. At 18 and 22 months, 92% and 90% of patients had relief of their dysphagia. This study suggests that
RAHM is safer than LHM, because it decreases the incidence of esophageal perforation to 0%, even in patients who had previous
treatment. At short-term follow-up, relief of dysphagia was equally achieved in both groups.
Presented at the Forty-Sixth Annual Meeting of The Society for Surgery of the Alimentary Tract, Chicago, Illinois, May 14–18,
2005 (oral presentation).
This study was supported in part by a grant provided by Intuitive Surgical, Inc. and Ethicon Endo-Surgery, Inc. 相似文献
93.
94.
95.
A Parra F Gabi?o A Ramírez H Valencia I Coria A Espinosa de los Monteros 《Contraception》1991,44(5):541-547
The study was undertaken to analyze the basal and metoclopramide-stimulated serum PRL levels in healthy parous women users (group 1, n = 12) and non-users (group 2, n = 12) of a TCu-380 IUD. All women had regular menses and were studied between days 18 to 22 of their cycle; none had lactated nor regularly ingested any type of medication during the last six months. After a 10-12 hour overnight fast, peripheral venous blood samples were obtained through an indwelling catheter at -30, -15 and 0 minutes and at 60, 90 and 120 minutes after oral metoclopramide (10 mg). There were no significant differences in serum PRL between both groups, in basal levels nor throughout the test, whether analyzing the mean values at each sampling time, the sum of PRL levels from 60-120 minutes, or the peak levels. No correlation was observed between PRL levels and any of the clinical or obstetric characteristics of the women in both groups. Serum progesterone was greater than or equal to 4.0 ng/ml in all women. Thus, the use of alpha TCu-380 IUD did not induce any significant changes in basal nor in stimulated serum PRL levels. 相似文献
96.
J. M. Bellón N. García-Honduvilla N. Serrano M. Rodríguez G. Pascual J. Buján 《Hernia》2005,9(4):338-343
The component of a composite prosthesis, which makes contact with the visceral peritoneum, can be reabsorbable or non-reabsorbable,
and laminar or reticular. This study was designed to determine whether the composition of this second, barrier component could
improve its behavior at this interface. Abdominal wall defects in rabbits were repaired using a polypropylene prosthesis (PP),
or the composites Sepramesh (PP+h) or Vicryl (PP+v). Fourteen days after surgery, the implants were evaluated by light and
scanning electron microscopy, and immunohistochemistry. Prosthetic areas occupied by adhesions (PP: 71.08±5.09, PP+h: 18.55±4.96,
P+v: 69.69±16.81%), neoperitoneal thickness (PP: 256.17±21.68, PP+h: 83.11±19.63, PP+v:213.72±35.90 μm) and macrophage counts
(PP: 8.73±1.16, PP+h: 27.33±4.13, PP+v: 31.24±3.08%) showed significant differences (P<0.05). The tested biomaterials induced an optimal recipient tissue infiltration. Least adhesion formation was observed on
the PP+h implants. This suggests that the second component, although reabsorbable, should be smooth in structure. 相似文献
97.
98.
99.
100.