全文获取类型
收费全文 | 513333篇 |
免费 | 33972篇 |
国内免费 | 613篇 |
专业分类
耳鼻咽喉 | 6893篇 |
儿科学 | 16838篇 |
妇产科学 | 13521篇 |
基础医学 | 85011篇 |
口腔科学 | 14472篇 |
临床医学 | 44337篇 |
内科学 | 93610篇 |
皮肤病学 | 12155篇 |
神经病学 | 36180篇 |
特种医学 | 18453篇 |
外国民族医学 | 63篇 |
外科学 | 77035篇 |
综合类 | 8473篇 |
一般理论 | 118篇 |
预防医学 | 38967篇 |
眼科学 | 12134篇 |
药学 | 40537篇 |
中国医学 | 1006篇 |
肿瘤学 | 28115篇 |
出版年
2018年 | 4930篇 |
2015年 | 4508篇 |
2014年 | 6059篇 |
2013年 | 9544篇 |
2012年 | 12866篇 |
2011年 | 14269篇 |
2010年 | 8299篇 |
2009年 | 7770篇 |
2008年 | 13692篇 |
2007年 | 14697篇 |
2006年 | 14937篇 |
2005年 | 14354篇 |
2004年 | 14045篇 |
2003年 | 13389篇 |
2002年 | 13267篇 |
2001年 | 24068篇 |
2000年 | 25078篇 |
1999年 | 20555篇 |
1998年 | 5426篇 |
1997年 | 4705篇 |
1996年 | 5041篇 |
1995年 | 4625篇 |
1994年 | 4318篇 |
1993年 | 4135篇 |
1992年 | 15725篇 |
1991年 | 16309篇 |
1990年 | 16422篇 |
1989年 | 15796篇 |
1988年 | 14575篇 |
1987年 | 14419篇 |
1986年 | 13597篇 |
1985年 | 12975篇 |
1984年 | 9627篇 |
1983年 | 8247篇 |
1982年 | 4559篇 |
1981年 | 4229篇 |
1979年 | 9418篇 |
1978年 | 6855篇 |
1977年 | 5772篇 |
1976年 | 5602篇 |
1975年 | 6396篇 |
1974年 | 7634篇 |
1973年 | 7130篇 |
1972年 | 6962篇 |
1971年 | 6685篇 |
1970年 | 6172篇 |
1969年 | 5888篇 |
1968年 | 5559篇 |
1967年 | 5012篇 |
1966年 | 4450篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
C.I.V. FRANKLIN 《Journal of Medical Imaging and Radiation Oncology》1992,36(1):44-47
This paper examines the effect of patient age, tumour grade and extent of surgery on the outcome of treatment of 278 patients with high grade malignant gliomas referred to the Queensland Radium Institute between 1980 and 1987. The aim was to determine whether the extent of surgical resection alters survival rates. The extent of surgery had no effect on survival except for those patients with grade 3 tumours in whom a total excision was possible. Those in whom only a biopsy was done did not have a worse prognosis. Grading was found to be of importance, as patients with grade 3 tumours had a better survival than those with grade 4 tumours. In grade 4 tumours, those under 30 years of age had a better survival than those over 30 years, whereas with grade 3 tumours there was a gradation of age effect (under 40 years best, then 40–49 years, and those 50 years and over doing worst). 相似文献
162.
163.
Laparoscopic cholecystectomy and time-course changes in renal function 总被引:13,自引:3,他引:10
Y. Miki K. Iwase W. Kamiike E. Taniguchi K. Sakaguchi J. Sumimura H. Matsuda I. Nagai 《Surgical endoscopy》1997,11(8):838-841
Background: Recently, the retraction method has been used to reduce intraabdominal pressure (IAP) during laparoscopic surgery. The purpose
of this study was to determine the serial changes in renal function during laparoscopic cholecystectomy (LC) using the retraction
method.
Methods: Urine output, effective renal plasma flow (ERPF), and glomerular filtration rate (GFR) were measured serially in seven patients
who underwent LC with 12 mmHg pneumoperitoneum (High-IAP group) and five who underwent LC using the retraction method with
4 mmHg pneumoperitoneum (Low-IAP group).
Results: Urine output, ERPF, and GFR were decreased during pneumoperitoneum in the High-IAP group, whereas no significant changes
in any of these parameters were observed in the Low-IAP group.
Conclusions: Our findings demonstrate that reduction of IAP to 4 mmHg using the retraction method prevents the transient renal dysfunction
caused by prolonged 12 mmHg pneumoperitoneum during LC, suggesting that the retraction method reduces the risk of perioperative
renal dysfunction during laparoscopic surgery.
Received: 26 March 1996/Accepted: 27 July 1996 相似文献
164.
165.
166.
167.
Three hundred and twenty samples of subgingival plaque were obtained from 80 caucasian girls, ranging from 10 to 13 years of age. The samples were analyzed to verify the influence of age upon colonization of the gingival sulcus by microorganisms potentially pathogenic to the periodontal tissues. The gingival and plaque status were evaluated through the gingival index (GI) and plaque index (PlI) and the microflora was assessed by the enzymatic method benzoyl-arginine-naphthylamide (BANA). The results of the BANA test were positive for 62.50% of the tested individuals and 40% of the examined sites. The influence of age was statistically significant on BANA reactivity, and the number of positive sites was greater at 11 (57.5%) than at 12 years (28.8%). 相似文献
168.
169.
170.
Variations of the medial and inferior choanal limits may facilitate snoring. These are: 1) short vomer without crista choanalis vomeris and adaptational formations, 2) extremely concave posterior margin of the hard palate leading to disproportion between the muscular and aponeurotic part of m. tensor veli palatini and hence to a flabby soft palate especially during sleep, and 3) neonatal relation of the height and width of the choane resulting in a very large choanal region instead of relative reduction of choanal width compared to its increasing height. All these variations result in a flabby soft palate especially during sleep and may lead to formation of whirles of inspired air and snoring. 相似文献