全文获取类型
收费全文 | 1506篇 |
免费 | 116篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 57篇 |
妇产科学 | 28篇 |
基础医学 | 291篇 |
口腔科学 | 36篇 |
临床医学 | 173篇 |
内科学 | 307篇 |
皮肤病学 | 38篇 |
神经病学 | 66篇 |
特种医学 | 174篇 |
外科学 | 96篇 |
综合类 | 49篇 |
一般理论 | 35篇 |
预防医学 | 96篇 |
眼科学 | 38篇 |
药学 | 71篇 |
中国医学 | 2篇 |
肿瘤学 | 62篇 |
出版年
2023年 | 8篇 |
2021年 | 26篇 |
2020年 | 24篇 |
2019年 | 29篇 |
2018年 | 21篇 |
2017年 | 22篇 |
2016年 | 25篇 |
2015年 | 28篇 |
2014年 | 43篇 |
2013年 | 66篇 |
2012年 | 57篇 |
2011年 | 56篇 |
2010年 | 62篇 |
2009年 | 53篇 |
2008年 | 50篇 |
2007年 | 54篇 |
2006年 | 49篇 |
2005年 | 50篇 |
2004年 | 33篇 |
2003年 | 46篇 |
2002年 | 49篇 |
2001年 | 38篇 |
2000年 | 38篇 |
1999年 | 42篇 |
1998年 | 62篇 |
1997年 | 49篇 |
1996年 | 48篇 |
1995年 | 26篇 |
1994年 | 36篇 |
1993年 | 39篇 |
1992年 | 26篇 |
1991年 | 16篇 |
1990年 | 14篇 |
1989年 | 28篇 |
1988年 | 24篇 |
1987年 | 22篇 |
1986年 | 28篇 |
1985年 | 22篇 |
1984年 | 17篇 |
1983年 | 20篇 |
1982年 | 26篇 |
1981年 | 14篇 |
1980年 | 16篇 |
1978年 | 8篇 |
1977年 | 17篇 |
1976年 | 10篇 |
1975年 | 12篇 |
1973年 | 12篇 |
1972年 | 7篇 |
1971年 | 7篇 |
排序方式: 共有1639条查询结果,搜索用时 15 毫秒
1.
2.
3.
J C H Miles G M Kendall Z-F Ibrahimi C B Howarth 《Journal of radiological protection》2004,24(2):165-171
Etched track detectors are widely used for the detection of radon and its decay products. They have many desirable attributes: they are small, cheap, simple, non-toxic and non-hazardous. Etched track detectors provide adequate accuracy for most radiological protection purposes provided stringent quality assurance is maintained. The UK validation scheme provides an important component of QA but continuous monitoring of conditions and results is also needed. If these conditions are observed, these detectors provide an entirely adequate tool for large-scale use in assessing levels of radon in houses. Accurate estimates of long-term average radon levels require a measurement over several months because of the short-term fluctuations in radon concentrations. 相似文献
4.
5.
Douglas M. Howarth Martin T. Epstein Paul A. Thomas Leonard W. Allen Rachel Akerman Linda Lan 《European journal of nuclear medicine and molecular imaging》1997,24(12):1465-1469
The efficacy of fractionated out-patient radioiodine therapy in 38 patients with compressive symptoms due to long-standing
large multinodular goitres was assessed. The diagnosis was established by clinical assessment in addition to technetium-99m
pertechnetate thyroid scan or computed tomography scan of the thyroid and mediastinum. Oral iodine-131 therapy was administered
as a 2.22 GBq (60 mCi) cumulative dose over 4 months (555 MBq per month). All patients were monitored with serum thyroid-stimulating
hormone and free thyroxine (± free tri-iodothyronine) assays before the treatment and after each dose fraction. Clinical and
biochemical follow-up was performed on all patients and ranged from 6 to 45 months after therapy. The patients consisted of
35 female and three male patients with a median age of 59 years (range 37–87 years). Prior to treatment 20 patients were biochemically
hyperthyroid and 18 were euthyroid. Overall, 71% of patients reported a subjective improvement in compressive symptoms and
29% reported no change. Clinically assessed reduction in goitre size occurred in 92% of patients while there was no change
in 8%. At 3 months of follow-up, 31% of patients had become hypothyroid and at 18 months 66% were hypothyroid. Seven hyperthyroid
patients (35%) became euthyroid and 13 hyperthyroid patients (65%) became hypothyroid. Three patients who became hypothyroid
experienced neck soreness (transient in one patient, persistent in two patients). There were no differences in outcome between
patients who were hyperthyroid and those who were euthyroid prior to treatment. Fractionated out-patient radioiodine therapy
showed excellent short- and medium-term safety, was very well tolerated and offered a satisfactory alternative treatment to
surgery.
Received 23 May and in revised form 11 August 1997 相似文献
6.
GP SCHWAB AL BLUM E BODNER B DALLEMAGNE K GLASER H KOOP F PACE W RÖSCH JR SIEWERT G WETSCHER 《Journal of gastroenterology and hepatology》1997,12(12):785-789
Gastroesophageal reflux disease (GERD) is the most common disease of the upper gastrointestinal tract. With the introduction of proton pump inhibitors medical treatment of GERD has been significantly improved. However, the development of laparoscopic antireflux surgery resulted in an increasing interest of surgeons in this disease. An interactive meeting was organized in order to develop an agreement between gastoenterologists and surgeons regarding therapeutic decisions and this is the main topic of this paper. 相似文献
7.
8.
The processing of antigens delivered as DNA vaccines 总被引:2,自引:0,他引:2
Summary: The ability of DNA vaccines to provide effective immunological protection against infection and tumors depends on their ability to generate good CD4+ and CD8+ T‐cell responses. Priming of these responses is a property of dendritic cells (DCs), and so the efficacy of DNA‐encoded vaccines is likely to depend on the way in which the antigens they encode are processed by DCs. This processing could either be via the synthesis of the vaccine‐encoded antigen by the DCs themselves or via its uptake by DCs following its synthesis in bystander cells that are unable to prime T cells. These different sources of antigen are likely to engage different antigen‐processing pathways, which are the subject of this review. Understanding how to access different processing pathways in DCs may ultimately aid the rational development of plasmid‐based vaccines to pathogens and to cancer. 相似文献
9.
10.