全文获取类型
收费全文 | 1976篇 |
免费 | 130篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 63篇 |
妇产科学 | 35篇 |
基础医学 | 234篇 |
口腔科学 | 27篇 |
临床医学 | 272篇 |
内科学 | 444篇 |
皮肤病学 | 13篇 |
神经病学 | 187篇 |
特种医学 | 120篇 |
外科学 | 284篇 |
综合类 | 82篇 |
一般理论 | 2篇 |
预防医学 | 153篇 |
眼科学 | 18篇 |
药学 | 133篇 |
中国医学 | 3篇 |
肿瘤学 | 89篇 |
出版年
2021年 | 40篇 |
2020年 | 16篇 |
2019年 | 31篇 |
2018年 | 38篇 |
2017年 | 26篇 |
2016年 | 22篇 |
2015年 | 42篇 |
2014年 | 50篇 |
2013年 | 63篇 |
2012年 | 98篇 |
2011年 | 86篇 |
2010年 | 80篇 |
2009年 | 61篇 |
2008年 | 74篇 |
2007年 | 117篇 |
2006年 | 81篇 |
2005年 | 85篇 |
2004年 | 70篇 |
2003年 | 70篇 |
2002年 | 77篇 |
2001年 | 66篇 |
2000年 | 60篇 |
1999年 | 62篇 |
1998年 | 55篇 |
1997年 | 45篇 |
1996年 | 38篇 |
1995年 | 40篇 |
1994年 | 24篇 |
1993年 | 34篇 |
1992年 | 34篇 |
1991年 | 40篇 |
1990年 | 41篇 |
1989年 | 42篇 |
1988年 | 28篇 |
1987年 | 30篇 |
1986年 | 33篇 |
1985年 | 32篇 |
1984年 | 26篇 |
1983年 | 17篇 |
1982年 | 13篇 |
1981年 | 10篇 |
1980年 | 16篇 |
1979年 | 15篇 |
1978年 | 11篇 |
1977年 | 11篇 |
1976年 | 16篇 |
1975年 | 16篇 |
1972年 | 11篇 |
1971年 | 9篇 |
1970年 | 9篇 |
排序方式: 共有2175条查询结果,搜索用时 15 毫秒
1.
The initial management of bladder outflow obstruction typically related to benign prostatic hyperplasia (BPH) falls to a large extent within the remit of general practice. Referral onwards to secondary care typically arises following the failure to respond to conservative measures or when complications have supervened; the most significant of which is urinary retention. In the hospital setting, anaesthesia, constipation and immobility are the common precipitants. What follows is a practical guide to the management of these situations and provides an overview of the conservative, medical, minimally invasive and surgical treatments available. 相似文献
2.
3.
4.
Megan A. O’Grady Kristina Wilson Jennifer J. Harman 《The journal of primary prevention》2009,30(6):716-731
The purpose of this study was to evaluate a single-session peer-led safer sex intervention, based on the Information-Motivation-Behavioral
Skills theoretical model, for college students residing in campus residence halls. Participants (N = 108) were assigned to either an hour long control or 5-module intervention session. Compared to the control condition,
the intervention increased participants’ information and women’s subjective norms about preventative behavior. Both the control
and intervention sessions increased intentions to perform preventative behaviors (e.g., keep condoms available). These preliminary
results suggest that this intervention is promising for increasing constructs associated with safer sexual behavior and could
easily be implemented by residence hall staff. 相似文献
5.
C L Grady A M Grimes N Patronas T Sunderland N L Foster S I Rapoport 《Archives of neurology》1989,46(3):317-320
To determine if impaired dichotic performance in patients with dementia of the Alzheimer type is due to the inability to divide attention or the inability to perceive degraded auditory stimuli, we measured performance on tasks of both dichotic and degraded monotic speech materials. We also examined whether perception of degraded speech stimuli presented monaurally is related to abnormalities of temporal lobe anatomy and physiology, as we have shown for dichotic performance. Although the patients were impaired on both dichotic and monotic tests, significantly greater impairment was seen on the dichotic test. Our earlier finding of a significant relation between dichotic performance and measures of anterior temporal lobe atrophy and reduced glucose metabolism was replicated, but no significant relation was found between monotic tests and measures to temporal lobe integrity. We conclude that the inability to divide attention, rather than abnormal processing of degraded stimuli per se, is reflected in poor dichotic performance in patients with dementia of the Alzheimer type, and that dichotic performance, unlike degraded monotic perception, depends directly on the integrity of temporal cortex in these patients. 相似文献
6.
Taylor Moran-Gates Christopher Grady Young Shik Park Ross J Baldessarini Frank I Tarazi 《European neuropsychopharmacology》2007,17(6-7):448-455
The atypical antipsychotic risperidone is often prescribed to pediatric patients with neuropsychiatric disorders, though its effects on the developing brain remain unclear. Accordingly, we studied the effects of repeated treatment of risperidone on dopamine receptors in brain regions of juvenile rat. Levels of dopamine receptors (D(1), D(2), D(3), D(4)) in forebrain regions of juvenile rats were quantified after 3 weeks of treatment with three different doses of risperidone (0.3, 1.0 and 3.0 mg/kg) and compared findings to those in adult rats treated with risperidone (3.0 mg/kg/day) previously. Risperidone (at 1.0 and 3.0 mg/kg/day) increased levels of D(1) receptors in nucleus accumbens and caudate-putamen of juvenile, but not adult rats. Conversely, all three doses of risperidone dose-dependently increased D(2) labeling in medial prefrontal cortex and hippocampus, and D(4) receptor in nucleus accumbens, caudate-putamen and hippocampus of juvenile animals as well as in adults. Only the high dose of risperidone (3.0 mg/kg) increased D(2) receptors in caudate-putamen in both juvenile and adult brain. D(3) receptors were not altered by risperidone in any brain region at any dose or age. The findings indicate dose-dependent effects of risperidone on dopamine receptors in developing animals, and that juvenile animals are more sensitive than adults to the cerebral effects of risperidone. 相似文献
7.
8.
Preoperative superselective arteriolar embolization: a new approach to enhance resectability of spinal tumors 总被引:6,自引:0,他引:6
The extent of surgical resection of spinal tumors is frequently limited by blood loss and technical difficulty associated with the vascularity of the tumors. We report here the use of superselective percutaneous arterial embolization to reduce the rate of blood loss at the time of surgical resection and enhance resectability. The types of tumors treated were metastatic renal carcinoma, metastatic thyroid carcinoma, metastatic melanoma, and giant cell tumor of the sacrum. Two of the patients required repeated embolization and surgery for recurrent symptoms. The estimated blood loss in seven of nine procedures performed on the six patients ranged from 300 to 800 ml, after which no transfusion was required. In two procedures, extensive resection of very large tumors resulted in larger losses of blood, and postoperative transfusion was necessary. No significant complications of embolization or surgery occurred. A key factor in our embolization technique is the use of microfibrillar collagen, which allows occlusion of tumor vessels as small as 20 microns and may prevent reconstitution of the embolized vessels by collateral flow. We conclude that preoperative arterial embolization enhances the resectability of a variety of spinal tumors by reducing intraoperative blood loss. This may provide an additional benefit by reducing the risk related to postoperative transfusion. By permitting a more aggressive surgical approach, the use of preoperative embolization also has the potential to improve outcome in patients with spinal tumors. 相似文献
9.
Premenstrual symptoms in black and white community samples 总被引:1,自引:0,他引:1
A L Stout T A Grady J F Steege D G Blazer L K George M L Melville 《The American journal of psychiatry》1986,143(11):1436-1439
Premenstrual syndrome specialty clinics are reported to be almost exclusively attended by white women. This racial discrepancy has raised the question of whether there is a lower prevalence or severity of symptoms during the premenstruum among black women. The authors evaluated selected premenstrual symptoms in a representative community-based sample and found no difference in the prevalence or severity of premenstrual symptoms reported by black and white women, except for a higher prevalence of food cravings among blacks. Exploration of broader sociocultural factors may explain the observed racial difference in seeking help for premenstrual complaints. 相似文献
10.