全文获取类型
收费全文 | 139054篇 |
免费 | 1074篇 |
国内免费 | 55篇 |
专业分类
耳鼻咽喉 | 4469篇 |
儿科学 | 4680篇 |
妇产科学 | 5869篇 |
基础医学 | 25426篇 |
口腔科学 | 3407篇 |
临床医学 | 6265篇 |
内科学 | 28608篇 |
皮肤病学 | 6212篇 |
神经病学 | 9580篇 |
特种医学 | 5857篇 |
外科学 | 22166篇 |
综合类 | 460篇 |
一般理论 | 4篇 |
预防医学 | 4711篇 |
眼科学 | 5538篇 |
药学 | 4581篇 |
中国医学 | 47篇 |
肿瘤学 | 2303篇 |
出版年
2015年 | 3325篇 |
2014年 | 3928篇 |
2013年 | 5180篇 |
2012年 | 3794篇 |
2011年 | 3584篇 |
2010年 | 3926篇 |
2009年 | 3995篇 |
2008年 | 3856篇 |
2007年 | 3729篇 |
2006年 | 4189篇 |
2005年 | 3668篇 |
2004年 | 3359篇 |
2003年 | 1753篇 |
1999年 | 910篇 |
1998年 | 1180篇 |
1997年 | 1199篇 |
1996年 | 1597篇 |
1995年 | 1771篇 |
1994年 | 1810篇 |
1993年 | 1699篇 |
1992年 | 1789篇 |
1991年 | 1545篇 |
1990年 | 1393篇 |
1989年 | 1236篇 |
1988年 | 1127篇 |
1987年 | 1203篇 |
1986年 | 1147篇 |
1985年 | 967篇 |
1984年 | 1077篇 |
1983年 | 882篇 |
1982年 | 1089篇 |
1981年 | 992篇 |
1980年 | 957篇 |
1979年 | 997篇 |
1978年 | 1141篇 |
1973年 | 907篇 |
1936年 | 880篇 |
1934年 | 881篇 |
1933年 | 1493篇 |
1932年 | 1483篇 |
1931年 | 1472篇 |
1930年 | 1652篇 |
1929年 | 1389篇 |
1928年 | 1530篇 |
1927年 | 1497篇 |
1926年 | 1583篇 |
1925年 | 1544篇 |
1924年 | 1611篇 |
1923年 | 1465篇 |
1922年 | 1442篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Priv.-Doz. Dr. J. Radermacher 《Der Internist》2003,44(10):1283-1300
Renal ultrasonography has become the standard imaging modality in the investigation of kidneys because it displays excellent anatomic detail, requires no special preparation of the patient and does not expose the patient to radiation or contrast agents. Ultrasonography is used to determine the site and size of the kidney and to detect focal lesions like tumors, cysts and renal stones. Furthermore the presence and urodynamic relevance of hydronephrosis can reliably be revealed. Also renoparenchymatous diseases are discernible to the experienced investigator, however most glomerular diseases cannot be further subclassified. Exceptions are primarily renovascular disorders like hypertensive nephrosclerosis, diabetic nephropathy or renal vasculitis. Color Doppler sonography allows the detection and quantification of renal artery stenosis, increased resistance index values may indicate irreversible disease. Ultrasonography has also been found of value in the evaluation of renal transplant kidneys. Especially in the early transplant course potentially fatal but reversible diseases like renal vein thrombosis or urinomas are detected with high sensitivity. In the long term, an increased resistance index value may also predict allograft failure. 相似文献
52.
53.
At the moment, therapeutic splitting is still regarded by the vast majority of surgeons as the gold standard for stones in the common bile duct. Endoscopic clearance of the duct certainly is much less invasive than open exploration. However, this does not apply when compared with laparoscopic stone removal. Both are equivalent in respect to stone clearance rates, but the laparoscopic techniques protect patients from the long-term sequelae of endoscopic papillotomy. This can be important particularly for younger patients. Laparoscopic bile duct exploration is cost-effective and safe. Special experience in laparoscopic surgical techniques, however, is mandatory. Thus, surgeons should intensify their training in laparoscopic bile duct exploration in order to increase the acceptance of these techniques. 相似文献
54.
55.
56.
Severe adverse effects during the use of ovulation inhibitors occur mostly in women who have an elevated risk for the development of certain diseases owing to hereditary or acquired factors. By means of a careful personal or family history analysis as well as specific laboratory examinations, an existing predisposition may frequently be diagnosed and the individual risk associated with the use of oral contraceptive inhibitors may be estimated. The present contribution describes the potential effects of treatment with ovulation inhibitors on women with thrombophilia, cardiovascular disease, diabetes mellitus, dyslipidemia, overweight or underweight, tumors, psychiatric and neurological diseases and autoimmune disease. The hormonal methods and non-hormonal alternatives available for contraception are elucidated according to existing lesions and risk factors and the advantages and disadvantages are discussed. 相似文献
57.
Dr. R. Hinrichs L. Weber K. Scharffetter-Kochanek 《Der Hautarzt; Zeitschrift für Dermatologie, Venerologie, und verwandte Gebiete》2006,57(5):455-458
Ohne Zusammenfassung 相似文献
58.
59.
60.
Ashutosh Singh M.Ch. Vidyut Kumar Sinha M.Ch. Jayant Khandekar M.Ch. Nandkishor Agrawal M.Ch. Anil Patwardhan M.Ch. Dr. Jagdish Kharideparkar M.Ch. 《Indian Journal of Thoracic and Cardiovascular Surgery》2006,22(2):121-125
Objective The degree of Left Ventricular Mass Index (LVMI) regression following aortic valve replacement correlates with long-term survival.
This study aims to assess the extent of LVMI regression at 3 months following aortic valve replacement (AVR) with different
types and sizes of mechanical valves in rheumatic aortic valve disease.
Methods The LVMI regression was studied in 34 consecutive patients, undergoing elective AVR for rheumatic aortic stenosis and/or regurgitation.
They were grouped in A and B, matched in age, body surface area and pre-operative LVMI, receiving respectively a tilting disc
and a bileaflet mechanical valve. The LVMI was calculated by M-mode echocardiography using the Devereux' formula pre-operatively
and three months post-operatively. The trend of LVMI reduction was compared between the two groups and amongst the patients
with stenotic, regurgitant and mixed aortic valve, pathologies; and receiving different sizes of valves.
Results The mean preoperative LVMI was 199g±79.5 g/m2. At three months post aortic valve replacement, the mean LVMI was 130g±49.0 g/m2. There was a significant reduction of LVMI post-operatively (p=0.001) at three months follow-up. The extent of LVMI regression
following surgery amongst the groups A and B did not vary significantly (p=0.92). The extent of LVMI regression did not vary
significantly in patients with different aortic valve pathology nor with different sizes of the valves implanted.
Conclusions There is a significant early LVMI regression following aortic valve replacement in rheumatic aortic valve disease. The type
and the size of the mechanical prosthesis or the rheumatic pathology do not appear to influence this regression. 相似文献