全文获取类型
收费全文 | 9766篇 |
免费 | 1011篇 |
国内免费 | 34篇 |
专业分类
耳鼻咽喉 | 69篇 |
儿科学 | 236篇 |
妇产科学 | 305篇 |
基础医学 | 1412篇 |
口腔科学 | 280篇 |
临床医学 | 936篇 |
内科学 | 1664篇 |
皮肤病学 | 204篇 |
神经病学 | 667篇 |
特种医学 | 775篇 |
外科学 | 1548篇 |
综合类 | 266篇 |
一般理论 | 7篇 |
预防医学 | 989篇 |
眼科学 | 211篇 |
药学 | 591篇 |
中国医学 | 2篇 |
肿瘤学 | 649篇 |
出版年
2021年 | 129篇 |
2020年 | 76篇 |
2019年 | 168篇 |
2018年 | 174篇 |
2017年 | 124篇 |
2016年 | 126篇 |
2015年 | 148篇 |
2014年 | 196篇 |
2013年 | 278篇 |
2012年 | 385篇 |
2011年 | 412篇 |
2010年 | 256篇 |
2009年 | 279篇 |
2008年 | 422篇 |
2007年 | 417篇 |
2006年 | 445篇 |
2005年 | 411篇 |
2004年 | 359篇 |
2003年 | 341篇 |
2002年 | 324篇 |
2001年 | 306篇 |
2000年 | 305篇 |
1999年 | 263篇 |
1998年 | 171篇 |
1997年 | 180篇 |
1996年 | 195篇 |
1995年 | 171篇 |
1994年 | 136篇 |
1993年 | 134篇 |
1992年 | 238篇 |
1991年 | 209篇 |
1990年 | 203篇 |
1989年 | 247篇 |
1988年 | 190篇 |
1987年 | 216篇 |
1986年 | 195篇 |
1985年 | 207篇 |
1984年 | 147篇 |
1983年 | 125篇 |
1982年 | 107篇 |
1981年 | 67篇 |
1980年 | 79篇 |
1979年 | 117篇 |
1978年 | 72篇 |
1977年 | 84篇 |
1976年 | 70篇 |
1975年 | 62篇 |
1974年 | 74篇 |
1973年 | 70篇 |
1968年 | 63篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
Arousal from propofol 总被引:1,自引:0,他引:1
12.
13.
Ex vivo neutrophil function in response to three different doses of glycosylated rHuG-CSF (Lenograstim) 总被引:4,自引:0,他引:4
J. Turzanski S. P. M. Crouch J. Fletcher & A. Hunter 《British journal of haematology》1997,96(1):46-54
Granulocyte colony-stimulating factor (G-CSF) is being considered as adjuvant treatment for infections in non-neutropenic patients. Normal healthy donors were given rHuG-CSF (Lenograstim) at 2.5, 5.0 and 7.5 μg/kg subcutaneously daily for 5 d. Polymorphonuclear leucocyte (PMN) function tests were carried out on peripheral blood PMN before the first injection and at 24 h and 96 h. Circulating PMN levels were also measured at these time intervals and found to be significantly increased with all doses by 24 and 96 h. Investigation of cell surface antigen expression revealed no changes in β2 integrin (CD11b/CD18) expression. L-selectin (CD62L) expression was reduced with all doses by 96 h, this being significant with the 7.5 μg/kg dose. FcγRI (CD64) levels were significantly up-regulated with the 7.5 μg/kg dose by 96 h whereas FcγRIII (CD16) expression was found to be reduced during G-CSF treatment. Superoxide anion production was significantly increased in response to N -formylmethionylleucylphenylalanine (FMLP) and opsonized Staphylococcus epidermidis stimulation at 24 h and 96 h with the 5.0 and 7.5 μg/kg doses. The initial rate of phagocytosis (0–2 min) appeared to have increased with the 7.5 and 5.0 μg/kg doses at 96 and 24 h compared with PMN responses pretreatment, although these increases were not statistically significant. These results show that G-CSF enhances the functional responses of PMN stimulated by physiological agonists and may help in the treatment of infections. 相似文献
14.
15.
Eileen J. Martin Kiran S. Panickar Michael A. King Malgorzata Deyrup Bruce E. Hunter Geehuan Wang Edwin M. Meyer 《Drug development research》1994,31(2):135-141
The potential cytoprotective actions of a novel nicotinic agent 2,4-dimethoxybenzilidene anabaseine (DMXB) were investigated in differentiated PC12 cells and transected rat septal cholinergic neurons in vivo. In NGF-differentiated PC12 cells, removal of both NGF and serum led to cell loss, a reduced % of cells expressing neurites, the release of lactate dehydrogenase, and a decrease in total cellular protein. Cell loss was apparent within 24 h, and remained constant between 4–8 days post-NGF removal. NGF alone (100 ng/ml), DMXB (10 μM), but not nicotine (10 μM), prevented these cell and neurite losses. DMXB-induced cytoprotection was blocked by 1 μM mecamylamine. DMXB (1 mg/kg, ip) injected twice but not once per day protected cholinesterase-staining septal neurons from retrograde degeneration following unilateral fimbrial transections. The twice per day DMXB injection-protocol also decreased cell roundness among cholinesterase-staining cells in the lesioned septal hemisphere compared to saline-injected animals. These studies suggest that DMXB may exert cytoprotective activity in NGF-sensitive neuronal populations. © 1994 Wiley-Liss, Inc. 相似文献
16.
Alex Westerband Joseph L. Mills Scott S. Berman Glenn C. Hunter 《Annals of vascular surgery》1997,11(1):14-19
n = 69) normal; Group B (n= 29), abnormal, severe defects; Group C (n= 56), abnormal, mild–moderate defect. RCA detected 32 defects in Group B: 10 internal carotid (ICA), seven endpoint flaps,
two kinks, one dissection; 16 external carotid (ECA), 10 severe endpoint defects and six total occlusion; six common carotid
(CCA), five irregular proximal shelfs, one web. Thirty of 32 defects were successfully repaired as confirmed by normal repeat
RCA studies; one ECA defect was not repaired and the ICA dissection was irreparable. In Group C, 67 mild–moderate defects
were identified, but not corrected. These included <30% stenosis in the ICA (12), ECA (18), CCA (24), and vein patch corrugation
or irregularity (13). For the entire series the postoperative ICA occlusion rate was 2% (3/154), stroke rate 2.6% (4/154),
and a subsequent >50% restenosis rate of 7% (11/154). The yield from routine carotid completion arteriograms was significant,
with 19% of studies identifying a severe defect that required repair. Although the difference in stroke rates and restenosis
between the different groups did not reach statistical significance, patients with normal intraoperative arteriograms initially
or after correction of a significant RCA defect had no early carotid occlusion (p= 0.05, Fisher's exact test) compared to patients with residual RCA defects. All early carotid occlusions occurred in patients
with unrepaired defects. We conclude that RCA is an important method of quality control after CEA and exerts a subtle, but
real, reduction in postoperative complications. 相似文献
17.
In a nonimmunocompromised patient with cerebral cryptococcosis, unique magnetic resonance findings included abnormalities limited to the posterior fossa and cerebellar hemispheric edema, gyriform enhancement of the vermis and cerebellar hemispheres, and infratentorial plaquelike enhancement. Magnetic resonance findings in central nervous system cryptococcosis are discussed. 相似文献
18.
PURPOSE: Little is known about use and expenditure patterns of children's eye-care services and about possible disparities in care among children. This report describes the use and expenditure patterns of eye care and non-eye care services for children under 18 years old in the United States. METHODS: Levels of use and expenditure were estimated using self-reported information from the nationally representative Medical Expenditure Panel Surveys (1996-2001) for 48,304 subjects under 18 years old from randomly selected households in the United States. Means presented for children with and without diagnosed eye conditions were adjusted for child and family characteristics using generalized linear models. RESULTS: Children with diagnosed eye conditions had higher levels of use and expenditure than children without diagnosed conditions. Families of children with diagnosed eye conditions incurred higher out-of-pocket expenditures. Black children and children living below 400% of the federal poverty level had lower levels of use and expenditure, indicating that they received fewer and less intensive services. CONCLUSIONS: Children with diagnosed eye conditions experienced higher overall use of health care. Some groups of children appear to be underserved. Estimates of use and expenditure patterns, stratified by socioeconomic factors, will be needed to plan for future delivery of children's eye and vision care services and to assess progress toward Healthy People 2010 goals. 相似文献
19.
Sabine Maguire Bruce Hunter Lindsay Hunter Jo Richard Sibert Mala Mann Alison Mary Kemp 《Archives of disease in childhood》2007,92(12):1113-1117
INTRODUCTION: A torn labial frenum is widely regarded as pathognomonic of abuse. METHODS: We systematically reviewed the evidence for this, and to define other intra-oral injuries found in physical abuse. Nine studies documented abusive torn labial frena in 27 children and 24 [corrected] were fatally abused: 22 were less than 5 years old. Only a direct blow to the face was substantiated as a mechanism of injury. RESULTS: Two studies noted accidentally torn labial frena, both from intubation. Abusive intra-oral injuries were widely distributed to the lips, gums, tongue and palate and included fractures, intrusion and extraction of the dentition, bites and contusions. CONCLUSIONS: Current literature does not support the diagnosis of abuse based on a torn labial frenum in isolation. The intra-oral hard and soft tissue should be examined in all suspected abuse cases, and a dental opinion sought where abnormalities are found. 相似文献
20.