全文获取类型
收费全文 | 1267376篇 |
免费 | 96894篇 |
国内免费 | 1587篇 |
专业分类
耳鼻咽喉 | 16439篇 |
儿科学 | 41162篇 |
妇产科学 | 35336篇 |
基础医学 | 190069篇 |
口腔科学 | 34848篇 |
临床医学 | 118222篇 |
内科学 | 249053篇 |
皮肤病学 | 27462篇 |
神经病学 | 102268篇 |
特种医学 | 46881篇 |
外国民族医学 | 265篇 |
外科学 | 179300篇 |
综合类 | 25772篇 |
现状与发展 | 3篇 |
一般理论 | 569篇 |
预防医学 | 105020篇 |
眼科学 | 28121篇 |
药学 | 92839篇 |
6篇 | |
中国医学 | 2043篇 |
肿瘤学 | 70179篇 |
出版年
2018年 | 13754篇 |
2017年 | 10509篇 |
2016年 | 11431篇 |
2015年 | 13210篇 |
2014年 | 18205篇 |
2013年 | 27708篇 |
2012年 | 37867篇 |
2011年 | 40323篇 |
2010年 | 23265篇 |
2009年 | 22460篇 |
2008年 | 38031篇 |
2007年 | 40717篇 |
2006年 | 40247篇 |
2005年 | 39381篇 |
2004年 | 37777篇 |
2003年 | 36174篇 |
2002年 | 35089篇 |
2001年 | 56186篇 |
2000年 | 57234篇 |
1999年 | 48225篇 |
1998年 | 13443篇 |
1997年 | 12249篇 |
1996年 | 12667篇 |
1995年 | 11934篇 |
1994年 | 11135篇 |
1993年 | 10421篇 |
1992年 | 38277篇 |
1991年 | 37731篇 |
1990年 | 36509篇 |
1989年 | 35309篇 |
1988年 | 32750篇 |
1987年 | 32073篇 |
1986年 | 30558篇 |
1985年 | 28807篇 |
1984年 | 21962篇 |
1983年 | 19206篇 |
1982年 | 11374篇 |
1981年 | 10326篇 |
1979年 | 20954篇 |
1978年 | 15398篇 |
1977年 | 12800篇 |
1976年 | 11853篇 |
1975年 | 12822篇 |
1974年 | 15603篇 |
1973年 | 15373篇 |
1972年 | 14524篇 |
1971年 | 13556篇 |
1970年 | 12790篇 |
1969年 | 12068篇 |
1968年 | 11233篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
In newly diagnosed adult patients with epilepsy followed prospectively on monotherapy, carbamazepine and phenytoin were associated with a fall in plasma uric acid, but sodium valproate and phenobarbitone were associated with a rise in plasma uric acid. The mechanisms and significance of these findings are discussed. 相似文献
994.
Mechanical properties of post and core systems 总被引:1,自引:0,他引:1
995.
996.
Superficial bladder cancer: intravesical chemotherapy and tumour progression to muscle invasion or metastases 总被引:2,自引:0,他引:2
G Smith R A Elton G D Chisholm J E Newsam T B Hargreave 《British journal of urology》1986,58(6):659-663
Of 299 patients who presented with superficial bladder cancer (Ta, T1), 60 were treated by intravesical chemotherapy (Epodyl, methotrexate or mitomycin C). The rate of tumour progression to muscle invasion or metastases was identical for each intravesical regime. There was no evidence that mitomycin C promoted tumour progression. Carcinoma in situ in non-tumour-bearing urothelium was the most significant predictive factor for progression to muscle invasion or metastases. 相似文献
997.
M Caruana R Jones A Lahiri G Brigden E Rodrigues C Dore E B Raftery 《Nuclear medicine communications》1986,7(10):717-728
Five studies were conducted to examine the degree of variability to be expected during the use of the non-imaging nuclear probe (BIOS Inc.) under a variety of clinical conditions. Comparison of the ejection fraction (EF) readings between the nuclear probe and a gamma camera showed good agreement, with the nuclear probe tending to underestimate lower, and overestimate higher camera EF values [mean (S.D.) difference, 0.84% (6.06)]. A comparison of two nuclear probes showed a small mean (S.D.) difference of EF readings of 0.063% (2.26). EF readings obtained in normal subjects 6 weeks apart were reproducible and differed by a mean (S.D.) of 0.23% (4.42). The administration of placebo to 10 normal subjects followed by sequential measurements for 4 h produced EF changes large enough to mimic a clinical effect, the largest hourly change observed being 5.4%, indicating the need for strict placebo control in interventional experiments. Data on four patients with heart failure showed small non-significant EF changes in the 1 h after placebo administration but a wide intra-subject range of ejection time and time to peak filling measurements. This highlights the problem of accurate, reproducible cursor placement in such patients. The nuclear probe is a portable, low cost instrument which produces accurate EF measurements when compared with the gamma camera. 相似文献
998.
Bilateral simultaneous Achilles tendon ruptures are rare, with only ten cases reported in the English literature. Our case is that of a 44-year-old woman, along with a review of the literature. Affected persons usually are on chronic steroid treatment and in the fifth to seventh decades of life. The patient may have concomitant systemic disease, and the injury occurs with relatively mild trauma. The goals of treatment are mainly preventative, i.e., cessation of steroids as soon as possible and protective bracing of the remaining intact Achilles tendon. 相似文献
999.
Differential distribution of pepsinogen II between the zones of the human prostate and the seminal vesicle 总被引:2,自引:0,他引:2
J H Reese J E McNeal E A Redwine I M Samloff T A Stamey 《The Journal of urology》1986,136(5):1148-1152
Pepsinogen II (PG II) is a gastric proenzyme which has previously been found in both human seminal fluid and the prostate gland. However, no regional distribution of PG II has been noted within the prostate nor has it been found in the seminal vesicle. Bouins-fixed sections of central zone, peripheral zone and seminal vesicle, taken from 10 prostates removed at radical prostatectomy or cystectomy, were exposed to antibody against PG II and stained using the A-B-C immunoperoxidase technique. Formalin-fixed tissue from autopsy prostates of four men in the third decade, and six cases with BPH nodules, were also examined for PG II activity. In nine of 10 seminal vesicles, and seven of 10 central zone samples, more than 50 per cent of the cells stained positive for PG II. By contrast, in nine of 10 peripheral zone samples staining was present in five per cent or less of the epithelial cells. Similarly, PG II activity in the four autopsy prostates occurred almost entirely within the central zone and ended abruptly at the boundary between the peripheral and central zones. BPH nodules contained no PG II activity. These findings provide the first evidence that the central and peripheral zones may serve different biological functions. Embryologically it is currently thought that the prostate is of endodermal origin and the seminal vesicle of mesodermal origin. The presence of large amounts of PG II in both the seminal vesicle and central zone lends support to the hypothesis of a common mesodermal origin for these two structures. 相似文献
1000.
The clinical and serological findings and computer tomographic (CT) appearances of a case of secondary cerebral amebiasis due to Entamoeba histolytica are presented. The effect of therapy on the neurological symptoms as well as on the CT findings are described in detail. The multiple intracerebral lesions resolved almost completely and the patient survived without any neurological sequelae. 相似文献