全文获取类型
收费全文 | 26085篇 |
免费 | 1918篇 |
国内免费 | 93篇 |
专业分类
耳鼻咽喉 | 430篇 |
儿科学 | 650篇 |
妇产科学 | 558篇 |
基础医学 | 3037篇 |
口腔科学 | 529篇 |
临床医学 | 2541篇 |
内科学 | 5845篇 |
皮肤病学 | 553篇 |
神经病学 | 2182篇 |
特种医学 | 966篇 |
外科学 | 4033篇 |
综合类 | 499篇 |
现状与发展 | 1篇 |
一般理论 | 24篇 |
预防医学 | 2379篇 |
眼科学 | 606篇 |
药学 | 1637篇 |
中国医学 | 25篇 |
肿瘤学 | 1601篇 |
出版年
2023年 | 132篇 |
2022年 | 231篇 |
2021年 | 542篇 |
2020年 | 321篇 |
2019年 | 522篇 |
2018年 | 643篇 |
2017年 | 447篇 |
2016年 | 533篇 |
2015年 | 593篇 |
2014年 | 866篇 |
2013年 | 1223篇 |
2012年 | 1779篇 |
2011年 | 1864篇 |
2010年 | 1053篇 |
2009年 | 1005篇 |
2008年 | 1646篇 |
2007年 | 1770篇 |
2006年 | 1721篇 |
2005年 | 1697篇 |
2004年 | 1653篇 |
2003年 | 1484篇 |
2002年 | 1310篇 |
2001年 | 313篇 |
2000年 | 307篇 |
1999年 | 328篇 |
1998年 | 359篇 |
1997年 | 240篇 |
1996年 | 202篇 |
1995年 | 202篇 |
1994年 | 189篇 |
1993年 | 154篇 |
1992年 | 192篇 |
1991年 | 155篇 |
1990年 | 121篇 |
1989年 | 131篇 |
1988年 | 129篇 |
1987年 | 129篇 |
1986年 | 141篇 |
1985年 | 132篇 |
1984年 | 147篇 |
1983年 | 119篇 |
1982年 | 128篇 |
1981年 | 126篇 |
1980年 | 100篇 |
1979年 | 91篇 |
1978年 | 102篇 |
1977年 | 99篇 |
1976年 | 84篇 |
1975年 | 72篇 |
1974年 | 66篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Four groups of piglets were used to test the use of pericardium and periosteum as free grafts in the repair of full thickness cervical tracheal defects. Pericardium provided an airtight, rapidly healing graft, but did not give sufficient structural rigidity to prevent narrowing and growth failure at the graft site. Composite grafts of pericardium and periosteum were also unsatisfactory, in that the periosteum failed to produce enough bone to prevent collapse of the graft. Since previous studies have shown that periosteal grafts result in good bone formation when applied alone or as an extramucosal support, it is concluded that the osteogenic potential is dependent on the available blood supply and speed of revascularization. It appears that the presence of pericardium in the composite grafts may have inhibited this property. 相似文献
62.
Susan D. Ross M.D. Angela DiGeorge B.S. Janet E. Connelly B.S. Gregory W. Whiting B.S Neil McDonnell Pharm.D. 《Pharmacotherapy》1998,18(6):1290-1297
We performed a literature search for all clinical studies reporting outcomes in patients with the acquired immunodeficiency syndrome (AIDS) receiving granulocyte-macrophage colony-stimulating factor (GM-CSF) for any indication. Safety outcomes included human immunodeficiency virus replication, immune status, and frequency of opportunistic infections and neoplasms. Data were synthesized qualitatively. We identified 22 studies (274 patients): 12 addressed AIDS neutropenia, 8 AIDS cancer therapy, and 2 opportunistic infections. Viral burden was assessed by serum p24Ag in 15 studies. Nine reported no change in levels, three net decreases, and three net increases. All studies showing net increases involved patients receiving GM-CSF without a concurrent antiretroviral. The CD4 counts were unchanged in 5 studies, increased in 3, and not reported in 14. The incidence of neoplasms or new opportunistic infections was low. The literature suggests no increased risk of viral replication or clinical deterioration in patients with AIDS who take GM-CSF concurrently with zidovudine. 相似文献
63.
64.
65.
66.
67.
Despite advances in the care of infants born with congenital diaphragmatic hernia, mortality rate continues to be high. Immediate survival is directly related to the degree of pulmonary hypoplasia present. The spectrum is wide, from minimal pulmonary hypoplasia, in which neonates do well, to severe pulmonary hypoplasia, which is incompatible with life. Between these two extremes lie infants with compromised pulmonary function whose long-term survival depends on the clinical strengths of their multidisciplinary team. Over the past year, 23 infants with congenital diaphragmatic hernia were cared for in the Multidisciplinary Intensive Care Unit at Children's Hospital, Boston. A retrospective chart review enabled the authors to describe the trajectory of illness and generate nursing practice guidelines. This article presents the nursing care issues that were identified in this challenging population. 相似文献
68.
A comparative analysis of radiological and surgical placement of central venous catheters 总被引:3,自引:1,他引:2
Kieran D. McBride Ross Fisher Neil Warnock David A. Winfield Malcolm W. Reed Peter A. Gaines 《Cardiovascular and interventional radiology》1997,20(1):17-22
Purpose To compare the differences in practice and outcome of all radiologically and surgically placed central venous catheters retrospectively
over a 2-year period simultaneously, at a single institution.
Methods A total of 253 Hickman catheters were inserted in 209 patients; 120 were placed radiologically in 102 patients and 133 were
placed surgically in 107 patients. The indication was chemotherapy in 76% of radiological and in 47% of surgical cases; the
remainder were for total parenteral nutrition and venous access.
Results There were 6 (4.5%) primary surgical failures and a further 17 (13%) surgical cases requiring multiple placement attempts.
Pneumothorax occurred once (0.8%) surgically and four times (3.3%) radiologically. There were no radiological primary misplacements
but there were five (3.7%) surgical ones. Catheter or central vein thrombosis occurred in four (3.3%) radiological and five
(3.7%) surgical cases. The rate of infection per 1000 catheter-days was 1.9 in radiologically placed catheters and 4.0 in
surgically placed ones (p<0.001). Average catheter life-span was similar for the two placement methods (100±23 days).
Conclusion Radiological placement is consistently more reliable than surgical placement. There are fewer placement complications and
fewer catheter infections overall. 相似文献
69.
70.
Alan G. Rose M.D. Neil G. Heselson M. Med. Richard K. Marks F.R.C.S. Dorothea Kranold F.F.RAD 《Skeletal radiology》1992,21(2):140-145
A man presented with a mass in the left first metacarpal bone. Later, his chest radiograph showed extensive, bilateral, rounded opacities in both lungs with enlarged hilar lymph nodes, and he developed expanding lesions in the left radius, ulna, and metacarpal bones. The pulmonary lesions were treated with radiotherapy and cytotoxic agents, and the tumor mass in the first metacarpal was debulked. All biopsies showed similar features of a mixed tumor (pleomorphic adenoma) with metastatic or embolic pulmonary involvement; ultrastructural and immunocytochemical investigations supported this unique diagnosis. The patient remains well 15 years after the initial diagnosis. It is possible that the myoepithelial elements in this case had been displaced intraosseously during development. We are not aware of a similar case in the literature. 相似文献