全文获取类型
收费全文 | 5376篇 |
免费 | 400篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 164篇 |
妇产科学 | 110篇 |
基础医学 | 842篇 |
口腔科学 | 75篇 |
临床医学 | 447篇 |
内科学 | 1481篇 |
皮肤病学 | 140篇 |
神经病学 | 538篇 |
特种医学 | 120篇 |
外科学 | 447篇 |
综合类 | 26篇 |
一般理论 | 3篇 |
预防医学 | 494篇 |
眼科学 | 112篇 |
药学 | 319篇 |
中国医学 | 41篇 |
肿瘤学 | 405篇 |
出版年
2023年 | 79篇 |
2022年 | 156篇 |
2021年 | 283篇 |
2020年 | 125篇 |
2019年 | 182篇 |
2018年 | 216篇 |
2017年 | 145篇 |
2016年 | 171篇 |
2015年 | 196篇 |
2014年 | 224篇 |
2013年 | 295篇 |
2012年 | 438篇 |
2011年 | 470篇 |
2010年 | 181篇 |
2009年 | 178篇 |
2008年 | 318篇 |
2007年 | 264篇 |
2006年 | 262篇 |
2005年 | 244篇 |
2004年 | 247篇 |
2003年 | 210篇 |
2002年 | 229篇 |
2001年 | 51篇 |
2000年 | 48篇 |
1999年 | 54篇 |
1998年 | 36篇 |
1997年 | 36篇 |
1996年 | 27篇 |
1995年 | 23篇 |
1994年 | 21篇 |
1993年 | 29篇 |
1992年 | 35篇 |
1991年 | 26篇 |
1990年 | 16篇 |
1989年 | 24篇 |
1988年 | 13篇 |
1987年 | 14篇 |
1986年 | 11篇 |
1985年 | 12篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 15篇 |
1981年 | 10篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1977年 | 6篇 |
1975年 | 6篇 |
1968年 | 6篇 |
1938年 | 8篇 |
1927年 | 7篇 |
排序方式: 共有5796条查询结果,搜索用时 296 毫秒
71.
72.
73.
Alberto Prats‐Galino Martin Čapek Miguel A. Reina Erika Cvetko Barbora Radochova R. Shane Tubbs Marija Damjanovska Tatjana Stopar Pintarič 《Clinical anatomy (New York, N.Y.)》2018,31(3):424-431
The general microscopic characteristics of nerves are described in several textbooks of histology, but the specific microanatomies of most nerves that can be blocked by anesthesiologists are usually less well known. Our objective was to evaluate the 3D reconstruction of nerve fascicles from optical projection tomography images (OPT) and the ability to undertake an internal navigation exploring the morphology in detail, more specifically the fascicular interconnections. Median and lingual nerve samples were obtained from five euthanized piglets. OPT images of the samples were acquired and 3D reconstruction was performed. The OPT technique revealed the inner structure of the nerves at high resolution, including large and small fascicles, perineurium, interfascicular tissue, and epineurium. The fascicles were loosely packed inside the median nerve and more densely so in the lingual nerve. Analysis of the 3D models demonstrated that the nerve fascicles can show six general spatial patterns. Fascicular interconnections were clearly identified. The 3D reconstruction of nerve fascicles from OPT images opens a new path for research into the microstructure of the inner contents of fascicular nerve groups and their spatial disposition within the nerve including their interconnections. These techniques enable 3D images of partial areas of nerves to be produced and could became an excellent tool for obtaining data concerning the 3D microanatomy of nerves, essential for better interpretation of ultrasound images in clinical practice and thus avoiding possible neurological complications. Clin. Anat. 31:424–431, 2018. © 2017 Wiley Periodicals, Inc. 相似文献
74.
Emmanuel Ochefije Ngbede Mashood Abiola Raji Clara N. Kwanashie Chukwudi Okolocha Nanven Abraham Maurice Emmanuella Nguavese Akange Leslie Ewache Odeh 《亚太热带病杂志(英文版)》2012,2(5):367-369
ObjectiveTo assess the occurrence of Leptospira spp serovar Hardjo among Zebu cattle in some livestock producing areas of Kaduna State, Nigeria.MethodsSera samples were obtained from 164 Zebu breed of cattle above one year osf age in seven cattle farms were screened for antibodies to Leptospira spp. serovar Hardjo using Enzyme linked immunosorbent assay (ELISA).ResultsAntibodies to Leptospira spp. serovar Hardjo were detected in eighteen (10.98%) out of the 164 animals sampled. There was no significant difference (P>0.05) in seropositivity between the different age groups or between different Zebu breeds.ConclusionThe presence of Leptospirosis among the Zebu breeds of cattle may poses a threat to livestock production and has public health implication due to its zoonotic potential. 相似文献
75.
Arnaud Jabouille Maylis Delugin Rapha?l Pineau Alexandre Dubrac Fabienne Soulet Stéphanie Lhomond Nestor Pallares-Lupon Hervé Prats Andreas Bikfalvi Eric Chevet Christian Touriol Michel Moenner 《Oncotarget》2015,6(28):24922-24934
IRE1α is an endoplasmic reticulum (ER)-resident transmembrane signaling protein and a cellular stress sensor. The protein harbors a cytosolic dual kinase/endoribonuclease activity required for adaptive responses to micro-environmental changes. In an orthotopic xenograft model of human glioma, invalidation of IRE1α RNase or/and kinase activities generated tumors with remarkably distinct phenotypes. Contrasting with the extensive angiogenesis observed in tumors derived from control cells, the double kinase/RNase invalidation reprogrammed mesenchymal differentiation of cancer cells and produced avascular and infiltrative glioblastomas with blood vessel co-option. In comparison, selective invalidation of IRE1α RNase did not compromise tumor angiogenesis but still elicited invasive features and vessel co-option. In vitro, IRE1α RNase deficient cells were also endowed with a higher ability to migrate. Constitutive activation of both enzymes led to wild-type-like lesions. The presence of IRE1α, but not its RNase activity, is therefore required for glioblastoma neovascularization, whereas invasion results only from RNase inhibition. In this model, two key mechanisms of tumor progression and cancer cell survival are functionally linked to IRE1α. 相似文献
76.
Efficacy of the Otago Exercise Programme to reduce falls in community‐dwelling adults aged 65–80 years old when delivered as group or individual training
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
77.
78.
Clara Benedetta Conti Mariangela Giunta Daniele Gridavilla Dario Conte Mirella Fraquelli 《Ultrasound in medicine & biology》2017,43(4):725-734
Crohn's disease (CD) is an inflammatory chronic bowel disorder; it can involve the whole gastrointestinal tract, but its localization in the ileum or colon is most common. The reference standard for the diagnosis of CD is ileocolonoscopy with histologic assessment. The reference standard for the detection of any complications is surgery. However, imaging techniques have an important role both in the detection/localization of CD and in the follow-up of CD patients. In the last few years, the technical development of ultrasound equipment, the advent of new technologies such as elastography and mostly the increased expertise of sonographers have boosted the role of bowel ultrasound in assessment of the gastrointestinal tract. In fact, bowel ultrasound is particularly attractive thanks to its widespread availability, non-invasiveness, low cost and good reproducibility, as it can be easily repeated during follow-up. The aim of this article is to provide an extensive overview of the actual role of bowel ultrasound in the detection and follow-up of patients with CD. 相似文献
79.
80.