全文获取类型
收费全文 | 16438篇 |
免费 | 1739篇 |
国内免费 | 31篇 |
专业分类
耳鼻咽喉 | 135篇 |
儿科学 | 356篇 |
妇产科学 | 373篇 |
基础医学 | 2481篇 |
口腔科学 | 307篇 |
临床医学 | 1573篇 |
内科学 | 3050篇 |
皮肤病学 | 236篇 |
神经病学 | 1548篇 |
特种医学 | 663篇 |
外科学 | 2482篇 |
综合类 | 549篇 |
一般理论 | 56篇 |
预防医学 | 1729篇 |
眼科学 | 497篇 |
药学 | 1215篇 |
中国医学 | 11篇 |
肿瘤学 | 947篇 |
出版年
2022年 | 156篇 |
2021年 | 343篇 |
2020年 | 201篇 |
2019年 | 329篇 |
2018年 | 360篇 |
2017年 | 254篇 |
2016年 | 243篇 |
2015年 | 339篇 |
2014年 | 430篇 |
2013年 | 590篇 |
2012年 | 778篇 |
2011年 | 842篇 |
2010年 | 452篇 |
2009年 | 389篇 |
2008年 | 729篇 |
2007年 | 715篇 |
2006年 | 593篇 |
2005年 | 624篇 |
2004年 | 628篇 |
2003年 | 565篇 |
2002年 | 558篇 |
2001年 | 507篇 |
2000年 | 503篇 |
1999年 | 478篇 |
1998年 | 216篇 |
1997年 | 192篇 |
1996年 | 181篇 |
1995年 | 189篇 |
1994年 | 167篇 |
1993年 | 158篇 |
1992年 | 359篇 |
1991年 | 370篇 |
1990年 | 345篇 |
1989年 | 381篇 |
1988年 | 297篇 |
1987年 | 315篇 |
1986年 | 303篇 |
1985年 | 350篇 |
1984年 | 261篇 |
1983年 | 213篇 |
1982年 | 120篇 |
1980年 | 119篇 |
1979年 | 191篇 |
1978年 | 135篇 |
1977年 | 109篇 |
1975年 | 118篇 |
1974年 | 129篇 |
1973年 | 121篇 |
1972年 | 131篇 |
1971年 | 110篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
Auditory screening of infants 总被引:2,自引:0,他引:2
Within the last 20 years, infant hearing screening has progressed from a laudable goal to a state-mandated reality in many areas of the United States. The high risk register provides a means by which history and neonatal physical examination can be used to identify the infant at risk for hearing loss. Two procedures (crib-O-gram and auditory brainstem-evoked response) have been the most common methods of screening for hearing loss in the newborn or in intensive care nurseries. Evoked cochlear emissions reportedly are identifiable in 90 to 100% of normal-hearing infants. This observation has lead to the use of evoked otoacoustic emissions as a hearing screening procedure with infants. 相似文献
63.
64.
65.
Zn-phthalocyanine (ZnPc) and Sn-etiopurpurin (SnET2) incorporated in unilamellar liposomes or solubilized in a Cremophor-EL emulsion have been incubated in vitro with rabbit plasma or intravenously administered to rabbits. Ultracentrifugation and chromatographic analysis of the plasma showed that ZnPc and SnET2 are mainly released to lipoproteins; within the lipoprotein family, both dyes are preferentially bound by low-density (LDL) and high-density (HDL) lipoproteins. The amount of dye bound with these two lipoprotein classes was related to their relative concentration in the plasma; in most cases a larger amount of photosensitizer was bound to HDL as compared to LDL on a protein concentration basis. 相似文献
66.
C McKenzie BAppSc P Megaw BAppSc I Morgan PhD MK Boelen PhD 《Clinical & experimental ophthalmology》1997,25(4):79-81
Deprivation of form vision by the fitting of translucent occluders suppressed the diurnal cycling of enkephalinergic amacrine cells (the ENSLI amacrine cells), in the chicken. Daily periods of normal vision or enforcing temporal contrast using strobe lighting appeared to restore normal functioning of the ENSLI cells. These results suggest that the ENSLI cells are involved in retinal circuits that assess the quality of the visual image and control eye growth. 相似文献
67.
68.
The management of patients with endoscopically removed malignant intestinal polyps is controversial. The risk of residual disease should be assessed against the risk of a surgical operation. The authors report 35 cases of malignant polyps (5.5% of 641 colonoscopically removed adenomas). Sixteen patients had carcinoma in situ and received no further treatment and 19 had invasive carcinoma (sessile in 6, pedunculated in 13). Of these 19, 7 did not undergo surgery--because of old age in 2, minimal invasion in 3, a low rectal location in 1 and refusal in 1. Twelve patients (3 with sessile, 9 with pedunculated polyps) underwent a surgical resection, and residual disease was present in 3 (25%), 1 with positive nodes. Reported criteria of increased risk of residual disease--cancer in lymphatics or veins, incomplete excision, tumour at resection margin, sessile and villous tumours--were present in nine. All three patients with residual disease had microscopically involved margins of resection. The authors believe that the increased risk of recurrence justifies the risk associated with subsequent surgical resection unless the patient is otherwise a poor operative risk. 相似文献
69.
70.
Neurophysiological investigation of diabetic impotence. Are sacral response studies of value? 总被引:1,自引:0,他引:1
The role of electrophysiologically elicited sacral responses in the detection of the neurological component of diabetic impotence has been evaluated in a detailed study using properly defined diagnostic criteria. The results prove that these tests are not reliable indicators of neuropathy and their relevance in the routine investigation of diabetic impotence is of questionable value. 相似文献