全文获取类型
收费全文 | 1198篇 |
免费 | 80篇 |
国内免费 | 34篇 |
学科分类
医药卫生 | 1312篇 |
出版年
2021年 | 16篇 |
2020年 | 14篇 |
2019年 | 13篇 |
2018年 | 12篇 |
2017年 | 9篇 |
2016年 | 14篇 |
2015年 | 10篇 |
2014年 | 24篇 |
2013年 | 45篇 |
2012年 | 53篇 |
2011年 | 55篇 |
2010年 | 27篇 |
2009年 | 33篇 |
2008年 | 51篇 |
2007年 | 59篇 |
2006年 | 54篇 |
2005年 | 52篇 |
2004年 | 29篇 |
2003年 | 44篇 |
2002年 | 46篇 |
2001年 | 39篇 |
2000年 | 34篇 |
1999年 | 40篇 |
1998年 | 51篇 |
1997年 | 34篇 |
1996年 | 31篇 |
1995年 | 22篇 |
1994年 | 21篇 |
1993年 | 26篇 |
1992年 | 19篇 |
1991年 | 15篇 |
1990年 | 13篇 |
1989年 | 24篇 |
1988年 | 23篇 |
1987年 | 18篇 |
1986年 | 28篇 |
1985年 | 18篇 |
1984年 | 20篇 |
1983年 | 19篇 |
1982年 | 19篇 |
1981年 | 15篇 |
1980年 | 10篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1975年 | 14篇 |
1973年 | 12篇 |
1971年 | 7篇 |
1967年 | 6篇 |
1927年 | 6篇 |
排序方式: 共有1312条查询结果,搜索用时 359 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.
目的由于卒中风险随着狭窄严重程度的增加而升高,因此认为颈内动脉(ICA)接近闭塞患者的卒中风险很高。在现有的随机试验中,还没有专门针对这种情况进行探讨,因此其处理尚存在争汶。方法:对相关文献进行系统评价。结果:对ICA接近闭塞患者的处理还存在争议:一些学者支持进行干预,而另一些学者则认为存在风险或没有益处而反对进行干预。在ICA接近闭塞的有症状患者中进行一项比较外科治疗与最佳内科治疗的多中心前瞻性随机试验似乎非常困难,因为这类研究需要大量的患者。尽管如此,基于目前的证据,似乎很难拒绝手术治疗。结论:由于目前对ICA接近闭塞患者的最佳处理方案仍存在着争议,因此需要前瞻性观察性研究以证实其在有症状和无症状人群中的患病率以及相关的卒中风险。基于目前的证据,大多数医疗中心选择手术治疗,但它相对干内科治疗的特粱尚右待证章. 相似文献
5.
6.
7.
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
8.
Rupture of the distal biceps tendon: evaluation with MR imaging 总被引:2,自引:0,他引:2
9.
10.