全文获取类型
收费全文 | 1995篇 |
免费 | 159篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 99篇 |
妇产科学 | 28篇 |
基础医学 | 225篇 |
口腔科学 | 37篇 |
临床医学 | 196篇 |
内科学 | 465篇 |
皮肤病学 | 28篇 |
神经病学 | 86篇 |
特种医学 | 334篇 |
外科学 | 298篇 |
综合类 | 15篇 |
一般理论 | 1篇 |
预防医学 | 94篇 |
眼科学 | 8篇 |
药学 | 65篇 |
中国医学 | 1篇 |
肿瘤学 | 178篇 |
出版年
2021年 | 20篇 |
2020年 | 10篇 |
2019年 | 29篇 |
2018年 | 38篇 |
2017年 | 21篇 |
2016年 | 24篇 |
2015年 | 39篇 |
2014年 | 40篇 |
2013年 | 75篇 |
2012年 | 69篇 |
2011年 | 60篇 |
2010年 | 61篇 |
2009年 | 61篇 |
2008年 | 53篇 |
2007年 | 76篇 |
2006年 | 67篇 |
2005年 | 52篇 |
2004年 | 55篇 |
2003年 | 41篇 |
2002年 | 43篇 |
2001年 | 34篇 |
2000年 | 45篇 |
1999年 | 39篇 |
1998年 | 103篇 |
1997年 | 76篇 |
1996年 | 84篇 |
1995年 | 57篇 |
1994年 | 57篇 |
1993年 | 65篇 |
1992年 | 41篇 |
1991年 | 36篇 |
1990年 | 44篇 |
1989年 | 61篇 |
1988年 | 46篇 |
1987年 | 58篇 |
1986年 | 42篇 |
1985年 | 43篇 |
1984年 | 35篇 |
1983年 | 25篇 |
1982年 | 25篇 |
1981年 | 25篇 |
1980年 | 32篇 |
1979年 | 16篇 |
1978年 | 22篇 |
1977年 | 22篇 |
1976年 | 23篇 |
1975年 | 18篇 |
1973年 | 7篇 |
1970年 | 8篇 |
1966年 | 6篇 |
排序方式: 共有2167条查询结果,搜索用时 15 毫秒
1.
Needle-localized breast biopsy: why do we fail? 总被引:10,自引:0,他引:10
2.
Michael J. Bernas Robert L. Askew Jane M. Armer Janice N. Cormier 《Current breast cancer reports》2010,2(1):53-58
Lymphedema is an under-recognized, progressive, life-long condition estimated to impact 2-3 million people in the United States.
The incidence of breast cancer related lymphedema varies greatly in the literature largely due to different measurement techniques,
competing thresholds for defining lymphedema, and variation in length of follow-up. Multiple imaging techniques have become
useful for diagnosis. Lymphoscintigraphy is one of the most commonly used, as it can identify pathways of lymphatic drainage,
quantify extent of dermal backflow, and help determine functional and morphologic changes in the lymphatic system. Early detection
and intervention hold the greatest promise of reducing the incidence of lymphedema. Health care providers involved with cancer
patients need to become more educated about lymphedema, aware of current risk-reduction practices, and familiar with methods
of diagnosis and assessment, so that patients with early swelling can be referred to lymphedema treatment specialists at a
time when treatment is more effective. 相似文献
3.
Ketai LH; Williamson MR; Telepak RJ; Levy H; Koster FT; Nolte KB; Allen SE 《Radiology》1994,191(3):665
4.
5.
荧光原位杂交技术分析人结肠菌群方法研究 总被引:2,自引:0,他引:2
建立荧光原位杂交技术分析人体内结肠菌群的方法。取受试者新鲜粪便 ,选用 5种特异性的 16SrRNA寡核苷酸探针 ,检测粪便样本收集后的保存时间、温度 ,离心条件及样本固定液存放时间对杂交计数结果的影响。结果建立最佳实验条件为 :粪便样本收集后应尽快在 4℃下保存 ,放置时间不要超过 12小时即作处理 ;样本的适宜离心条件为 70 0g 2分钟 ;样本用多聚甲醛固定后在 - 80℃下存放时间不要超过 5个月。该方法具有较好的稳定性 ,可以有效地检出个体之间结肠菌群的差异。 相似文献
6.
Bronchiolitis obliterans in systemic lupus erythematosus: beneficial effect of intravenous cyclophosphamide. 总被引:1,自引:0,他引:1 下载免费PDF全文
A 49 year old white woman with systemic lupus erythematosus and bronchiolitis obliterans was treated with prednisone (1 mg/kg daily), which led to a transitory improvement in pulmonary status. Cyclophosphamide was then added--4 mg/kg daily intravenously for five days, then 2 mg/kg daily orally--and this was followed by a dramatic and prolonged improvement. 相似文献
7.
Cephalometric measurements in snorers, non-snorers, and patients with sleep apnoea. 总被引:7,自引:4,他引:3 下载免费PDF全文
Cephalometry is often used to assess patients with sleep apnoea but whether these measurements differ from those in non-apnoeic snorers and how they are influenced by age is not clear. Cephalometric radiographs of patients with sleep apnoea were compared with those of snorers without sleep apnoea and those of non-snorers. Fifty two snorers with suspected sleep apnoea had a conventional sleep study and were divided into two groups: those with an apnoea-hypopnoea index greater than 10/h (n = 40, sleep apnoea group) and those whose apnoea-hypopnoea index was 10/h or less (n = 12, snorer group). The cephalometric measurements in these patients were compared with those of 34 non-snoring control subjects. Controls were subdivided into two groups: control group 1 included 17 subjects similar in age to the sleep apnoea and snorer groups (mean (SD) age 50.0 (10.9), 50.7 (9.4), and 50.6 (9.7) years); control group 2 included 15 young men (25.4 (2.6) years). The distance from the mandibular plane to the hyoid bone (MP-H) and the length of the soft palate were greater in the patients with sleep apnoea (28.7 (7.8) and 43.6 (5.0) mm) than in the snorers (23.7 (4.2) and 40.3 (4.9 mm). The MP-H was similar in snorers and age matched control subjects, but was significantly greater in the older than in the younger control subjects (22.1 (6.1) vs 17.0 (6.8]. The soft palate was longer in subjects who snored (both sleep apnoea patients and snorers) than in control subjects. The MP-H distance significantly correlated with age for all subjects (snorers and controls) and for the control subjects alone. This study shows that non-apnoeic snorers have cephalometric abnormalities that differ from those of patients with sleep apnoea and that cephalometric values are influenced by the subject's age. 相似文献
8.
Interview questionnaires offer more validity than self-administered format in exploring psychopathological or psychosocial phenomena of interest in psychiatric research. If used, special care needs to be paid to interviewers' training and ensuring that they maintain their reliability. No widespread training standards exist and each schedule may carry its own procedure. Our aims are to indicate how we trained interviewers with the French version of the Present State Examination (Wing, Cooper and Sartorius, 1974) and how we checked and kept acceptable interraters reliability during one study. We will provide data on the interraters reliability during the training and the study, as well as the test-retest reliability. These results will be used to support some guidelines when using this sort of psychiatric research questionnaires in order to ensure comparability both within the study and between studies. 相似文献
9.
10.