全文获取类型
收费全文 | 20494篇 |
免费 | 1382篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 100篇 |
儿科学 | 685篇 |
妇产科学 | 478篇 |
基础医学 | 2632篇 |
口腔科学 | 181篇 |
临床医学 | 3241篇 |
内科学 | 3650篇 |
皮肤病学 | 169篇 |
神经病学 | 1921篇 |
特种医学 | 443篇 |
外科学 | 2091篇 |
综合类 | 575篇 |
一般理论 | 14篇 |
预防医学 | 2758篇 |
眼科学 | 159篇 |
药学 | 1235篇 |
中国医学 | 12篇 |
肿瘤学 | 1557篇 |
出版年
2023年 | 116篇 |
2022年 | 161篇 |
2021年 | 384篇 |
2020年 | 245篇 |
2019年 | 385篇 |
2018年 | 475篇 |
2017年 | 381篇 |
2016年 | 368篇 |
2015年 | 436篇 |
2014年 | 692篇 |
2013年 | 973篇 |
2012年 | 1405篇 |
2011年 | 1597篇 |
2010年 | 824篇 |
2009年 | 749篇 |
2008年 | 1410篇 |
2007年 | 1470篇 |
2006年 | 1407篇 |
2005年 | 1433篇 |
2004年 | 1412篇 |
2003年 | 1268篇 |
2002年 | 1160篇 |
2001年 | 224篇 |
2000年 | 179篇 |
1999年 | 239篇 |
1998年 | 240篇 |
1997年 | 207篇 |
1996年 | 160篇 |
1995年 | 139篇 |
1994年 | 117篇 |
1993年 | 122篇 |
1992年 | 137篇 |
1991年 | 111篇 |
1990年 | 116篇 |
1989年 | 81篇 |
1988年 | 83篇 |
1987年 | 59篇 |
1986年 | 65篇 |
1985年 | 78篇 |
1984年 | 88篇 |
1983年 | 64篇 |
1982年 | 74篇 |
1981年 | 56篇 |
1980年 | 53篇 |
1979年 | 47篇 |
1978年 | 38篇 |
1977年 | 38篇 |
1974年 | 39篇 |
1973年 | 34篇 |
1969年 | 32篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
1.
2.
Sweeka Alexander Gurjeet Dulku Sharbell Hashoul Donna B Taylor 《Journal of Medical Imaging and Radiation Oncology》2019,63(4):473-478
Contrast‐enhanced spectral mammography (CESM) has a number of uses including the work‐up of inconclusive findings on mammography, assessment of breast symptoms, cancer staging, evaluation of response to neoadjuvant chemotherapy and recently as an alternative to magnetic resonance imaging (MRI) in high‐risk screening. CESM can be swiftly incorporated into the workflow of busy breast clinics. We share our experiences with CESM at a large breast assessment centre in Western Australia. 相似文献
3.
4.
5.
6.
7.
8.
To determine if impaired energy metabolism might contribute to some aspects of Alzheimer disease (AD), including the vulnerability of the CA1 region of the hippocampal formation and the altered cytoskeleton evident in neurofibrillary tangles, we examined the effects of metabolic poisons on neuronal damage and cytoskeletal disruption in the hippocampal formation. Intrahippocampal injection of 3-nitropropionic acid (3-NP) and malonic acid resulted in neuronal death, particularly in CA1. Cytoskeletal disruption included loss of dendritic MAP2, but sparing of axonal τ. MK-801 (a noncompetitive NMDA receptor antagonist) did not atenuate the lesions produced by intrahippocampal injection of malonate. MK-801, however, was effective against intrastriatal malonate. Acute systemic 3-NP resulted in neuronal damage and cytoskeletal disruption in the CA1 region of the hippocampal formation, including an extensive loss of MAP2 immuno-reactivity, but sparing of τ. The neuronal loss in CA1 was delayed as compared to striatum. Chronic intraventricular infusion of 3-NP produced a different pattern of neuronal damage. Loss of τ-1 immuno-reactivity was observed in CA3 and CA1 s. oriens, whereas MAP2 immunostaining was preserved. These results demonstrate that chronic and acute administration of metabolic inhibitors produce distinct patterns of neuronal damage and cytoskeletal disruption. The results further suggest a differential involvement of the NMDA receptor in malonate-induced neuronal damage in striatum as compared to the hippocampus. The pattern of neuronal damage and cytoskeletal disruption observed following acute metabolic impairment resembled some aspects of neurofibrillary pathology in AD, but did not result in τ hyperphosphorylation. 相似文献
9.
10.