全文获取类型
收费全文 | 12068篇 |
免费 | 785篇 |
国内免费 | 158篇 |
专业分类
耳鼻咽喉 | 193篇 |
儿科学 | 239篇 |
妇产科学 | 256篇 |
基础医学 | 1796篇 |
口腔科学 | 280篇 |
临床医学 | 965篇 |
内科学 | 2277篇 |
皮肤病学 | 589篇 |
神经病学 | 682篇 |
特种医学 | 889篇 |
外科学 | 1857篇 |
综合类 | 148篇 |
一般理论 | 1篇 |
预防医学 | 672篇 |
眼科学 | 192篇 |
药学 | 996篇 |
中国医学 | 159篇 |
肿瘤学 | 820篇 |
出版年
2023年 | 73篇 |
2022年 | 243篇 |
2021年 | 375篇 |
2020年 | 197篇 |
2019年 | 283篇 |
2018年 | 313篇 |
2017年 | 253篇 |
2016年 | 383篇 |
2015年 | 511篇 |
2014年 | 646篇 |
2013年 | 744篇 |
2012年 | 999篇 |
2011年 | 970篇 |
2010年 | 646篇 |
2009年 | 518篇 |
2008年 | 678篇 |
2007年 | 664篇 |
2006年 | 581篇 |
2005年 | 575篇 |
2004年 | 441篇 |
2003年 | 377篇 |
2002年 | 338篇 |
2001年 | 241篇 |
2000年 | 236篇 |
1999年 | 193篇 |
1998年 | 143篇 |
1997年 | 110篇 |
1996年 | 103篇 |
1995年 | 83篇 |
1994年 | 75篇 |
1993年 | 68篇 |
1992年 | 67篇 |
1991年 | 57篇 |
1990年 | 66篇 |
1989年 | 58篇 |
1988年 | 69篇 |
1987年 | 50篇 |
1986年 | 62篇 |
1985年 | 62篇 |
1984年 | 47篇 |
1983年 | 60篇 |
1982年 | 23篇 |
1981年 | 20篇 |
1980年 | 23篇 |
1979年 | 33篇 |
1978年 | 33篇 |
1977年 | 26篇 |
1976年 | 31篇 |
1975年 | 24篇 |
1973年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
M W Moon 《Critical Care Nursing Clinics of North America》1992,4(3):457-465
Caring for the adolescent with HIV infection or AIDS in the critical care setting is challenging. This article discusses medical treatments for HIV, aspects of adolescent development that influence their behaviors, certain behaviors that put adolescents at risk for HIV acquisition, ethical and legal concerns for caring for this population, nursing implications for care, and the needs of nurses caring for this population. 相似文献
35.
Thyroid-vitamin A interactions in chicks exposed to 3,4,3',4'-tetrachlorobiphenyl: influence of low dietary vitamin A and iodine 总被引:1,自引:0,他引:1
Poultry chicks receiving a low vitamin A semipurified diet and exposed to 3,4,3',4'-tetrachlorobiphenyl became hypothyroid in comparison with unexposed controls. Metabolic rate, total serum thyroxine, total serum triiodothyronine, and food intake decreased significantly while thyroid weight increased. Unexpectedly, growth rate was not affected on this diet. In the case of chicks receiving a low vitamin A--low iodine semipurified diet and exposed to the PCB congener, the hypothyroid response was apparently antagonized. Comparing exposed chicks with unexposed controls, metabolic rate and the proportion of free T3 (i.e., %T3 resin uptake) increased while total serum thyroxine and thyroid weight were unchanged. In addition, growth rate, food consumption, and serum retinol decreased on this diet. These results are interpreted to mean that growth rate may have been altered by circulating levels of retinol, and vitamin A insufficiency may predispose birds to the hypothyroid effects of PCBs. 相似文献
36.
37.
A case of a paraffinoma in the urinary bladder is presented. Plain radiography and intravenous urography showed a low attenuation filling defect in the urinary bladder, and CT demonstrated a lobulated fat-attenuation mass floating in the urinary bladder. 相似文献
38.
39.
Mast cell-deficient W/Wv infant mice were similar to normal mice in their susceptibility to and recovery from infection with the intestinal protozoan Cryptosporidium parvum. W/Wv adult mice were significantly more susceptible to primary infection than were normal adult mice, but both groups recovered at a similar rate. 相似文献
40.
The relationship of the extrinsic blood supply to regeneration in graft reconstructed peripheral nerves 总被引:3,自引:0,他引:3
A F Cook H K Moon M P Lynn D Margolin E Z Browne 《British journal of plastic surgery》1988,41(3):298-304
Median nerves of rats were reconstructed with conventional or vascular nerve grafts. After 2, 3 and 4 weeks, Allen Video-Enhanced Contrast, Differential Interference Contrast (AVEC-DIC) microscopy revealed axonal transport in most preparations, with varying degrees of myelination. Radio-isotope tracer was measured in the nerve. Two and 4 week measurements revealed no difference between the graft types. At 3 weeks the vascular graft group exhibited transport along the entire length of the nerve in contrast to a relatively abbreviated path length in the conventional graft group. Nerve conduction velocities (NCV) were measured proximal to, within and distal to the grafts. Three week NCV showed no difference between the graft types. The 4 week NCV revealed normal values in the vascular graft group at points distal to and within the graft. Significant slowing was seen in the conventional grafts at both points. 相似文献