全文获取类型
收费全文 | 9404篇 |
免费 | 747篇 |
国内免费 | 74篇 |
专业分类
耳鼻咽喉 | 204篇 |
儿科学 | 298篇 |
妇产科学 | 209篇 |
基础医学 | 1156篇 |
口腔科学 | 205篇 |
临床医学 | 835篇 |
内科学 | 1627篇 |
皮肤病学 | 195篇 |
神经病学 | 1046篇 |
特种医学 | 566篇 |
外科学 | 1278篇 |
综合类 | 202篇 |
一般理论 | 7篇 |
预防医学 | 911篇 |
眼科学 | 477篇 |
药学 | 511篇 |
中国医学 | 1篇 |
肿瘤学 | 497篇 |
出版年
2021年 | 149篇 |
2019年 | 103篇 |
2018年 | 117篇 |
2017年 | 81篇 |
2016年 | 106篇 |
2015年 | 119篇 |
2014年 | 202篇 |
2013年 | 282篇 |
2012年 | 396篇 |
2011年 | 404篇 |
2010年 | 253篇 |
2009年 | 250篇 |
2008年 | 384篇 |
2007年 | 400篇 |
2006年 | 380篇 |
2005年 | 409篇 |
2004年 | 418篇 |
2003年 | 361篇 |
2002年 | 333篇 |
2001年 | 319篇 |
2000年 | 300篇 |
1999年 | 318篇 |
1998年 | 104篇 |
1997年 | 112篇 |
1996年 | 106篇 |
1995年 | 107篇 |
1994年 | 89篇 |
1993年 | 83篇 |
1992年 | 193篇 |
1991年 | 198篇 |
1990年 | 205篇 |
1989年 | 174篇 |
1988年 | 181篇 |
1987年 | 195篇 |
1986年 | 174篇 |
1985年 | 210篇 |
1984年 | 126篇 |
1983年 | 103篇 |
1982年 | 85篇 |
1981年 | 86篇 |
1980年 | 81篇 |
1979年 | 114篇 |
1978年 | 112篇 |
1977年 | 89篇 |
1976年 | 91篇 |
1975年 | 83篇 |
1974年 | 97篇 |
1973年 | 96篇 |
1972年 | 82篇 |
1970年 | 86篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
B N Gray C Walker L Andrewartha S Freeman R C Bennett 《The Australian and New Zealand journal of surgery》1988,58(1):43-46
A controlled randomized clinical trial was undertaken to assess the ability of combined non-specific and specific immunotherapy to alter the disease-free interval and overall survival of patients with Stage B or C large bowel cancer. The immunotherapy consisted of a 2 year programme of vaccinations with BCG and neuraminidase-treated autologous tumour cells. Three hundred and one patients entered the trial. At 5 years of follow-up there is no evidence that this form of immunotherapy can alter either the disease-free interval or survival in this group of patients. 相似文献
43.
44.
G D Novack R David P F Lee M I Freeman E Duzman A L Batoosingh 《Ophthalmologica. Journal international d'ophtalmologie. International journal of ophthalmology. Zeitschrift für Augenheilkunde》1988,196(1):23-28
When glaucoma medication fails to adequately control intraocular pressure (IOP), a second medication is frequently added. Before adding a second drug to patients whose IOP was no longer controlled by 0.5% timolol, we tested the effect of switching to another beta blocker, levobunolol (0.5 or 1%). We also evaluated the effect of study participation on compliance in the control group continuing to receive 0.5% timolol. In each treatment group, the IOP of approximately 30-40% of the patients was successfully controlled for the 3-month study period. The remaining patients did not exhibit significant pressure reductions and were dropped from the study within 2 weeks. We concluded that (1) the results of 'switch' studies without a control group must be interpreted carefully, and (2) the initiation of a 'new regimen' with an equieffective beta blocker may be sufficient to increase compliance and thereby control IOP. 相似文献
45.
Kate Windridge Carolyn Tarrant George K Freeman Richard Baker Mary Boulton Janet Low 《The British journal of general practice》2004,54(502):364-366
We report an analysis of the qualitative phase of a study of patients' and carers' views of primary care services, focusing on their experiences of access to face-to-face general practitioner (GP) consultations during the period when new access policies were being implemented. Practices interpreted the new policy in various ways; restricted interpretations, including restriction of access to telephone booking, could cause distress to patients. Patients and carers welcomed flexible interpretations of the policy that offered choice, such as a choice of GP, or of booking in advance. 相似文献
46.
47.
Assessment of cardiovascular autonomic function. 总被引:5,自引:0,他引:5
Roy Freeman 《Clinical neurophysiology》2006,117(4):716-730
Autonomic assessment has played an important role in elucidating the role of the autonomic nervous system in diverse clinical and research settings. The techniques most widely used in the clinical setting entail the measurement of an end-organ response to a physiological provocation. The non-invasive measures of cardiovascular parasympathetic function involve the analysis of heart rate variability while the measures of cardiovascular sympathetic function assess the blood pressure response to physiological stimuli. Prolonged tilt-table testing, with or without pharmacological provocation, has become an important tool in the investigation of a predisposition to neurally mediated (vasovagal) syncope. Frequency domain analyses of heart rate and blood pressure variability, microneurography, occlusion plethysmography, laser Doppler imaging and flowmetry, and cardiac sympathetic imaging are currently research tools but may find a place in the clinical assessment of autonomic function in the future. 相似文献
48.
In part I of this review the principles governing the uses of analgesics and sedatives in the ITU were considered. In part II we shall review the drugs available considering first, symptomatic therapy and secondly, regional analgesia. 相似文献
49.
50.
Variables that affect the expansion rate and outcome of small abdominal aortic aneurysms 总被引:2,自引:0,他引:2
J L Cronenwett S K Sargent M H Wall M L Hawkes D H Freeman B J Dain J K Curé D B Walsh R M Zwolak M D McDaniel 《Journal of vascular surgery》1990,11(2):260-8; discussion 268-9
Seventy-three patients with small (less than 6 cm in diameter) abdominal aortic aneurysms (AAAs) were selected for nonoperative management and followed up with sequential ultrasound size measurements. Fifty-four men and 19 women, 51 to 89 years of age (mean 70 years), had an initial mean AAA size of 4.1 cm (anteroposterior) x 4.3 cm (lateral) diameter, with a calculated elliptic cross-sectional area of 14.3 cm2. After a mean of 37 months of follow-up, AAA area increased at a mean rate of 20% per year (3 cm2 yr; 0.4 to 0.5 cm/yr diameter). Expansion rate was not affected by initial aneurysm size. During follow-up, only 3 patients (4%) required urgent operation (1 died), 26 patients (36%) died of non-AAA causes, and 26 patients (36%) underwent elective AAA repair because of progressive size increase (1 died). Elective operations were performed at the rate of 10% per year, when mean AAA size had increased to 22 cm2 (5.1 cm in diameter). Multiple regression analysis of clinical parameters available at presentation indicated that subsequent elective AAA repair was predicted by younger age at diagnosis and larger initial aneurysm size. As anticipated, patients who underwent surgery had more rapid aneurysm expansion (5.3 cm2/yr) compared with patients who did not undergo surgery (1.6 cm2/yr; p less than 0.05). This difference was caused by more rapid expansion during later follow-up intervals among patients selected for operation and was not predicted by the change in aneurysm size observed during initial ultrasonographic follow-up. Final aneurysm size was predicted by initial size, duration of follow-up, and both systolic and diastolic pressure.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献