全文获取类型
收费全文 | 3209篇 |
免费 | 211篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 44篇 |
儿科学 | 74篇 |
妇产科学 | 145篇 |
基础医学 | 324篇 |
口腔科学 | 283篇 |
临床医学 | 265篇 |
内科学 | 935篇 |
皮肤病学 | 20篇 |
神经病学 | 257篇 |
特种医学 | 111篇 |
外科学 | 333篇 |
综合类 | 46篇 |
一般理论 | 1篇 |
预防医学 | 251篇 |
眼科学 | 35篇 |
药学 | 172篇 |
肿瘤学 | 141篇 |
出版年
2021年 | 46篇 |
2019年 | 27篇 |
2018年 | 34篇 |
2017年 | 22篇 |
2016年 | 26篇 |
2015年 | 37篇 |
2014年 | 52篇 |
2013年 | 86篇 |
2012年 | 114篇 |
2011年 | 101篇 |
2010年 | 66篇 |
2009年 | 50篇 |
2008年 | 100篇 |
2007年 | 115篇 |
2006年 | 117篇 |
2005年 | 116篇 |
2004年 | 147篇 |
2003年 | 106篇 |
2002年 | 107篇 |
2001年 | 122篇 |
2000年 | 106篇 |
1999年 | 114篇 |
1998年 | 46篇 |
1997年 | 47篇 |
1996年 | 51篇 |
1995年 | 48篇 |
1994年 | 40篇 |
1993年 | 34篇 |
1992年 | 100篇 |
1991年 | 82篇 |
1990年 | 60篇 |
1989年 | 89篇 |
1988年 | 67篇 |
1987年 | 98篇 |
1986年 | 82篇 |
1985年 | 105篇 |
1984年 | 53篇 |
1983年 | 49篇 |
1982年 | 26篇 |
1981年 | 25篇 |
1980年 | 30篇 |
1979年 | 59篇 |
1978年 | 49篇 |
1977年 | 31篇 |
1976年 | 25篇 |
1974年 | 27篇 |
1973年 | 30篇 |
1971年 | 22篇 |
1969年 | 22篇 |
1919年 | 23篇 |
排序方式: 共有3437条查询结果,搜索用时 15 毫秒
1.
2.
T. Wu L. G. Trahair M. J. Bound C. F. Deacon M. Horowitz C. K. Rayner K. L. Jones 《Diabetic medicine》2015,32(5):595-600
3.
Phosphate metabolites and steroid hormone receptors of benign and malignant breast tumors. A Nuclear Magnetic Resonance study 总被引:1,自引:0,他引:1
Phosphorous 31 (31P) nuclear magnetic resonance (NMR) spectra were recorded from perchloric acid extracts of benign and malignant breast tumors. The spectra were correlated with the histopathologic diagnosis and the steroid receptor status of the tumor. Higher relative content of the lipid-derived metabolite glycerolphosphoethanolamine (GPE), the high-energy nucleoside phosphates (nucleoside-diphosphate [NDP], nucleoside-triphosphate [NTP]), and sugar esters of uridine diphosphate (UDPS) appeared in the carcinomas. Malignant tumors also showed a lower ratio of phosphoethanolamine to phosphocholine (PE/PC) than benign conditions. Lower content of the lipid-derived metabolite glycerolphosphocholine (GPC) and high content of the high-energy compound phosphocreatine (PCr) were associated with malignant tumors having high content of estrogen receptors (ER). High PCr content was also associated in the carcinomas with high progesterone receptors (PgR) content. In the benign tumors NDP and NTP were higher in tumors with high PgR content. The authors suggest that 31P magnetic resonance spectroscopy (MRS) of the breast can provide additional variables to diagnose malignancy, and when combined with magnetic resonance imaging (MRI), invasive procedures may be avoided. It also seems that levels of PCr and GPC obtained from the spectra can serve as markers to hormonal receptor status of breast carcinomas, and may be used in addition to the ER and PgR content to improve prediction of the response to hormonal therapy. Additional development requires in situ MRI and MRS combined studies. 相似文献
4.
5.
Efficacy and toxicity of amiodarone for the treatment of supraventricular tachyarrhythmias 总被引:5,自引:0,他引:5
Amiodarone is an effective agent for all types of supraventricular tachyarrhythmias regardless of mechanism and may, in fact, control a high percentage of supraventricular tachyarrhythmias refractory to conventional antiarrhythmic agents. However, its toxicity should temper enthusiasm for the use of the medication in non-life-threatening arrhythmias. As always, when recommending specific therapies the potential benefit should be weighed in light of the related risk. In patients with life disordering, drug-refractory atrial fibrillation, it seems reasonable to attempt control with amiodarone. Likewise in patients with ectopic atrial tachycardias refractory to conventional agents, this seems reasonable as well. Other and better therapies are available for patients with life-threatening arrhythmias associated with the Wolff-Parkinson-White syndrome. While amiodarone is moderately effective in these patients, the advent of improved surgical techniques and the relatively low risk of an operation make surgery the treatment of choice. The role of IV amiodarone, acutely, in the treatment of supraventricular tachyarrhythmias remains to be defined. 相似文献
6.
7.
Possible genetic defects in regulation of glycosaminoglycans in patients with diabetic nephropathy 总被引:1,自引:0,他引:1
T Deckert I M Horowitz A Kofoed-Enevoldsen L Kjellén M Deckert C Lykkelund F Burcharth 《Diabetes》1991,40(6):764-770
The hypothesis of genetic defects in glycosaminoglycan (GAG) regulation among patients with insulin-dependent diabetes mellitus (IDDM) and nephropathy was assessed by studies in tissue cultures of fibroblasts obtained from 7 patients with normal urinary albumin excretion, 11 patients with diabetic nephropathy, and 6 nondiabetic control subjects. The incorporation of [2H] glucosamine and [35S] sulfate into hyaluronic acid (HA), chondroitin sulfate and dermatan sulfate (CS + DS), and heparan sulfate (HS) was measured in cells, matrix, and medium and related to micrograms of tissue protein. Large interindividual variations were seen in all three groups, and the incorporation of [3H] glucosamine into HA, CS + DS, and HS and [35S] sulfate into CS + DS and HS were not significantly different between the three groups. However, the fractional incorporation of [3H]glucosamine into HS was significantly reduced in diabetic patients with nephropathy compared with control subjects. This was the case not only when related to the total amount of GAGs (P = 0.014) but also when related to HA (P = 0.014). No significant difference was seen between control subjects and normoalbuminuric diabetic patients. The degree of N-sulfation of HS was not significantly different between the experimental groups. The results suggest that patients with diabetic nephropathy may suffer from deficiencies of coordinate regulation in the biosynthesis of GAG in fibroblasts, which may lead to a reduced density of HS in the extracellular matrix. If these changes reflect alterations in the biosynthesis of GAG from endothelial, myomedial, and mesangial cells, this observation may be relevant for the pathogenesis of severe diabetic complications. 相似文献
8.
9.
High-Temperature Short-Time Heat Inactivation of HIV and Other Viruses in Human Blood Plasma 总被引:4,自引:0,他引:4
Stanley E. Charm Steven Landau Bolanle Williams Bernard Horowitz Alfred M. Prince and Donna Pascual 《Vox sanguinis》1992,62(1):12-20
An ultra-short-time heating system was used to process blood plasma spiked with various viruses (HIV, vesicular stomatitis virus, encephalomyocarditis virus). Virus reduction and recovery of plasma proteins were measured at various temperatures from 65 to 85 degrees C. Processing at 77 degrees C and 0.006 s resulted in a high level of virus kill, including greater than or equal to 4.4 log10 HIV, while maintaining protein structure and activity essentially intact. 相似文献
10.
More children with CNS tumors will continue to be cured of their neoplasms as a result of improved surgical, radiotherapeutic, and chemotherapeutic intervention. The complex problems seen in these patients mandate their treatment at academic centers actively involved in therapeutic investigations and capable of providing comprehensive multidisciplinary care. 相似文献