全文获取类型
收费全文 | 1047篇 |
免费 | 59篇 |
国内免费 | 50篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 10篇 |
妇产科学 | 10篇 |
基础医学 | 111篇 |
口腔科学 | 9篇 |
临床医学 | 100篇 |
内科学 | 192篇 |
神经病学 | 94篇 |
特种医学 | 25篇 |
外科学 | 300篇 |
综合类 | 12篇 |
预防医学 | 69篇 |
眼科学 | 28篇 |
药学 | 62篇 |
中国医学 | 2篇 |
肿瘤学 | 122篇 |
出版年
2023年 | 7篇 |
2022年 | 15篇 |
2021年 | 18篇 |
2019年 | 11篇 |
2018年 | 18篇 |
2017年 | 13篇 |
2016年 | 17篇 |
2015年 | 13篇 |
2014年 | 14篇 |
2013年 | 32篇 |
2012年 | 53篇 |
2011年 | 43篇 |
2010年 | 22篇 |
2009年 | 29篇 |
2008年 | 42篇 |
2007年 | 61篇 |
2006年 | 54篇 |
2005年 | 59篇 |
2004年 | 49篇 |
2003年 | 31篇 |
2002年 | 45篇 |
2001年 | 32篇 |
2000年 | 29篇 |
1999年 | 40篇 |
1998年 | 17篇 |
1997年 | 16篇 |
1996年 | 23篇 |
1995年 | 17篇 |
1994年 | 13篇 |
1992年 | 18篇 |
1991年 | 16篇 |
1990年 | 24篇 |
1989年 | 24篇 |
1988年 | 16篇 |
1987年 | 13篇 |
1986年 | 11篇 |
1985年 | 9篇 |
1983年 | 20篇 |
1982年 | 7篇 |
1981年 | 10篇 |
1980年 | 9篇 |
1979年 | 18篇 |
1977年 | 8篇 |
1974年 | 7篇 |
1973年 | 7篇 |
1972年 | 8篇 |
1971年 | 11篇 |
1969年 | 7篇 |
1967年 | 7篇 |
1966年 | 8篇 |
排序方式: 共有1156条查询结果,搜索用时 15 毫秒
1.
2.
3.
R Cotter R Johnson M Tumbelson J Dexter S Young C A Taylor F Cosmas W B Rowe L Lin 《JPEN. Journal of parenteral and enteral nutrition》1988,12(2):121-126
The ability of soybean oil lipid emulsions to affect essential fatty acid deficiency (EFAD) and plasma fatty acid distribution was studied in neonatal pigs. The test animals were maintained on a fat-free diet prior to administration of lipid emulsion. Plasma and red blood cell (RBC) membrane levels of essential [linoleic (C-18:2 omega 6) and arachidonic (C-20:4 omega 6)] and nonessential [palmitic (C-16, palmitoleic (C-16:1 omega 7), stearic (C-18), and oleic (C-18:1 omega 9)] fatty acids and the triene:tetraene ratio [5,8,11-eicosatrienoic acid (C-20:3 omega 9):arachidonic acid (C-20:4 omega 6)] were monitored to ascertain the establishment of EFAD and its correction. Nonessential fatty acids were studied, as these components of lipid therapy have received little attention. Results indicate that soybean oil emulsions are effective in reversing fatty acid profiles found in EFAD, and both essential and nonessential fatty acids are under strict metabolic control. 相似文献
4.
5.
B G Campling A C Haworth H M Baker D L Greer J J Holden E C Bradley J Pym D F Dexter 《Cancer》1992,69(8):2064-2074
The establishment and characterization of 11 human lung cancer cell lines are described in this article. Nine of these cell lines were established over a 5-year period, from 1983 to 1988, from patients treated at the Kingston Regional Cancer Centre. These include eight definite or probable small cell lung cancer (SCLC) lines and one adenocarcinoma line. In addition, two other SCLC cell lines were characterized. All of the lines have been in continuous culture for more than 2 years. The clinical histories of the patients from whom the cell lines were derived are outlined here. Several features of the cell lines are presented, including the following: (1) a comparison of the histologic features of the cell lines with the original biopsy specimens; (2) the expression of various markers, including cytokeratin, carcinoembryonic antigen, calcitonin, and neuron-specific enolase; (3) activities of the enzymes l-dopa decarboxylase and the brain isoenzyme of creatine kinase; (4) growth characteristics; (5) cloning efficiency in soft agar; (6) tumorigenicity in nude mice; and (7) cytogenetic studies. These cell lines, obtained directly from patients with a spectrum of drug-sensitive and drug-resistant tumors, will be valuable in vitro models of sensitivity and resistance to chemotherapy in lung cancer. 相似文献
6.
H Dexter Barber John Lignelli Brian M Smith Barry K Bartee 《Journal of oral and maxillofacial surgery》2007,65(4):748-752
The most common types of barrier membranes used for bone or tissue regeneration are made of expanded-polytetrafluoroethylene (e-PTFE) or resorbable materials, such as collagen. Both the e-PTFE and resorbable membranes require primary soft tissue coverage. This article explores the use of a dense-polytetrafluoroethylene (d-PTFE) membrane, which does not require primary soft tissue coverage. The advantages of d-PTFE in contrast to the other more commonly used types of barrier membranes and the clinical significance of these advantages for implant surgical and restorative treatment are discussed. 相似文献
7.
Carter R Coberley Gary A Puckrein Angela C Dobbs Matthew A McGinnis Sadie S Coberley Dexter W Shurney 《Disease management》2007,10(3):147-155
In addition to race and ethnicity, specific geographic regions are associated with poorer outcomes of care. Individuals with diabetes experiencing health disparities typically have worse long-term outcomes, such as increased diabetes complications and mortality. Zip code mapping, or geocoding, was utilized in this study to identify regions of the United States with high diabetes prevalence rates and to identify areas with high densities of minority populations. Use of this methodology to examine the effect of disease management on a large, diverse diabetes population revealed greater improvement in clinical testing rates in health disparity zones compared with members living outside of these areas. In particular, significant improvement was achieved by members living in minority zip codes and by members aged 65 years or older. These findings demonstrate that members living in areas of health disparity obtain even greater benefit from diabetes disease management program participation, helping to reduce gaps in care. 相似文献
8.
Combinations of murine recombinant interleukin 3 (IL-3), purified murine macrophage colony-stimulating factor (M-CSF), and human recombinant interleukin 1 alpha (IL-1 alpha) were used to determine the effects of growth factors on the measured radiosensitivity of different populations of murine colony-forming cells (CFC). The data showed that combinations of growth factors resulted in different values of CFC radiosensitivity, being less than values observed when colony growth was stimulated using a single factor. For various combinations of growth factors, Do values ranged from 106 +/- 8 to 175 +/- 24 cGy for progenitor cells in normal bone marrow; 74 +/- 3 to 171 +/- 18 cGy for primitive multipotent CFC enriched using fluorescence-activated cell sorting; and from 46 +/- 4 to 131 +/- 10 cGy for more mature granulocyte-macrophage CFC, enriched by counterflow centrifugal elutriation. Only combinations of three factors produced the high values of Do reported in experiments using unpurified conditioned medium as a stimulus for colony formation. 相似文献
9.