全文获取类型
收费全文 | 218774篇 |
免费 | 3387篇 |
国内免费 | 161篇 |
专业分类
耳鼻咽喉 | 1737篇 |
儿科学 | 9095篇 |
妇产科学 | 3744篇 |
基础医学 | 21743篇 |
口腔科学 | 2755篇 |
临床医学 | 15529篇 |
内科学 | 38903篇 |
皮肤病学 | 1909篇 |
神经病学 | 19006篇 |
特种医学 | 10304篇 |
外国民族医学 | 1篇 |
外科学 | 35251篇 |
综合类 | 3775篇 |
一般理论 | 23篇 |
预防医学 | 20324篇 |
眼科学 | 4292篇 |
药学 | 13767篇 |
1篇 | |
中国医学 | 996篇 |
肿瘤学 | 19167篇 |
出版年
2023年 | 385篇 |
2022年 | 1048篇 |
2021年 | 1809篇 |
2020年 | 1008篇 |
2019年 | 1119篇 |
2018年 | 23120篇 |
2017年 | 18185篇 |
2016年 | 20674篇 |
2015年 | 2358篇 |
2014年 | 2935篇 |
2013年 | 3250篇 |
2012年 | 10324篇 |
2011年 | 24144篇 |
2010年 | 20670篇 |
2009年 | 12968篇 |
2008年 | 21635篇 |
2007年 | 23849篇 |
2006年 | 2653篇 |
2005年 | 4041篇 |
2004年 | 5089篇 |
2003年 | 5793篇 |
2002年 | 3740篇 |
2001年 | 1194篇 |
2000年 | 1294篇 |
1999年 | 902篇 |
1998年 | 533篇 |
1997年 | 454篇 |
1996年 | 343篇 |
1995年 | 325篇 |
1994年 | 288篇 |
1993年 | 212篇 |
1992年 | 471篇 |
1991年 | 503篇 |
1990年 | 555篇 |
1989年 | 494篇 |
1988年 | 411篇 |
1987年 | 345篇 |
1986年 | 313篇 |
1985年 | 322篇 |
1984年 | 254篇 |
1983年 | 198篇 |
1982年 | 126篇 |
1981年 | 100篇 |
1980年 | 134篇 |
1979年 | 158篇 |
1978年 | 109篇 |
1977年 | 117篇 |
1976年 | 102篇 |
1974年 | 111篇 |
1973年 | 100篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
Philippe Béchard Pierre Dolbec Julie Germain Gino Perron 《Journal canadien d'anesthésie》2004,51(4):398-399
82.
83.
84.
Ung-il Chung Hiroshi Kawaguchi Tsuyoshi Takato Kozo Nakamura 《Journal of orthopaedic science》2004,9(4):410-414
Mammalian bones have three distinct origins (paraxial mesoderm, lateral plate mesoderm, and neural crest) and undergo two different modes of formation (intra-membranous and endochondral). Bones derived from the paraxial mesoderm and lateral plate mesoderm mainly form through the endochondral process. During this process, hypertrophic chondrocytes play a vital role in inducing both osteogenesis and angiogenesis. One of the essential osteogenic factors secreted from hypertrophic chondrocytes is Indian hedgehog (Ihh). In contrast, bones derived from the neural crest mainly form through the intramembranous pro-cess and do not require Ihh. Thus, depending on their origin, bones have distinct signaling properties, which need to be considered in the research and application of bone biology.Presented at the 18th Annual Research Meeting of the Japanese Orthopaedic Association, Kitakyushu, Japan, October 17, 2003 相似文献
85.
86.
87.
88.
Fady K. Balaa T. Clark Gamblin Allan Tsung J. Wallis Marsh David A. Geller 《Journal of gastrointestinal surgery》2008,12(2):338-343
Background Application of linear stapling devices for extrahepatic vascular control in liver surgery has been well-established. However,
the technique for use of stapling devices in hepatic parenchymal transection is not well defined.
Purpose To describe the safety and efficacy of our technique for use of vascular stapling devices in hepatic parenchymal transection
during open right hepatic lobectomy is the purpose of this study.
Methodology We reviewed our experience with 101 consecutive open right hepatic lobectomies performed by a single surgeon between January
2003 and July 2006, in which vascular staplers were utilized for the parenchymal transection phase.
Results Of the 101 patients who underwent resection, 53 (52%) were female. The mean age was 58 years. Malignant disease was the indication
for resection in the majority of patients (88%). Of those with cancer, 78% (69 of 89) had metastatic colorectal cancer, 6%
(5 of 89) had metastatic neuroendocrine tumor, 4% (4 of 89) had hepatocellular carcinoma, 4% (4 of 89) had cholangiocarcinoma,
and the remaining 8% were other metastatic cancers. Twelve patients (12%) underwent resection for hepatic adenoma or symptomatic
benign disease (FNH or hemangioma). Forty-eight patients (48%) underwent a major ancillary procedure at the time of hepatic
resection. Thirty-nine patients (39%) had a nonanatomic wedge resection of a left lobe lesion, 27 patients (27%) had one or
more lesions treated with radiofrequency ablation (RFA), and 6 patients (6%) were treated with a synchronous bowel resection.
The median total operative time was 336 min (range 155–620 min). A Pringle maneuver for temporary vascular inflow occlusion
was utilized in all cases, with a median time of 9 min (range 4–17 min). Ten patients (10%) required blood transfusion during
surgery or in the postoperative period. The maximum transfusion was 2 U of packed red blood cells (PRBC) in seven patients
and 1 U of PRBC in three patients. The mean nadir postoperative hematocrit was 28.2. All patients with malignant disease had
tumor-free margins at the completion of the procedure. The average hospital length of stay was 6.0 days. One patient (1%)
developed a clinically significant bile leak requiring a postoperative endoscopic retrograde cholangiography (ERCP). No patient
required reoperation. The 30 and 60-day postoperative survival was 100%.
Conclusion These findings indicate that application of vascular stapling devices for parenchymal transection in major hepatic resection
is a safe technique, with low transfusion requirements and minimal postoperative bile leak. The technique allows for rapid
transection of the entire right hepatic lobe in under 10 min. Short video clips of the technique will be demonstrated.
Presented at the 2007 American Hepato–Pancreato–Biliary Association, Las Vegas, Nevada, April 19–22, 2007 (oral presentation/video
presentation). 相似文献
89.
Yi-Hwa Liu 《Journal of nuclear cardiology》2007,14(4):483-491
Conclusion Quantification of nuclear cardiac images provides a secondary support in reading myocardial perfusion images and improves
the reproducibility in the diagnosis of cardiovascular diseases. The technology for the remote Web reading of nuclear cardiac
images and the quantitative data allows for an easy and secured access to patient studies without the limitations of time
and space. The recent increasing interests and applications in molecular targeted imaging have opened a new field in nuclear
cardiology, and absolute image quantification of the focal tracer uptake in the myocardium is exceedingly critical for the
quantitative analysis of molecular targeted images. 相似文献
90.
CASE REPORT: A 12-year-old boy who had a history of Kawasaki disease 9 years ago experienced a subarachnoid hemorrhage by ruptured right posterior cerebral artery aneurysm. On day 1 operation, as the aneurysm was very fragile and bled easily, two intraoperative ruptures, including a very premature rupture, were encountered. As a result, a left hemiparesis especially severe in the left hand was caused by the right anterior thalamic infarction due to the occlusion of a thalamo-perforating artery arising near the neck of the aneurysm. DISCUSSION: The histopathological examination of the intraoperative excised aneurysmal dome disclosed the thickening of the endothelial inner due to the endothelial hypertrophy and the invasion of inflammatory cells. This finding of the aneurysm was partially mimicking the finding of the coronary artery of the patients with Kawasaki disease. The combination of cerebral aneurysm and Kawasaki disease has never been reported until now, and the etiology of the aneurysm of this patient is unclear. 相似文献