全文获取类型
收费全文 | 14559篇 |
免费 | 940篇 |
国内免费 | 50篇 |
专业分类
耳鼻咽喉 | 80篇 |
儿科学 | 416篇 |
妇产科学 | 396篇 |
基础医学 | 1722篇 |
口腔科学 | 178篇 |
临床医学 | 2256篇 |
内科学 | 3009篇 |
皮肤病学 | 179篇 |
神经病学 | 1414篇 |
特种医学 | 242篇 |
外科学 | 1299篇 |
综合类 | 388篇 |
一般理论 | 18篇 |
预防医学 | 2037篇 |
眼科学 | 262篇 |
药学 | 635篇 |
中国医学 | 15篇 |
肿瘤学 | 1003篇 |
出版年
2023年 | 78篇 |
2022年 | 90篇 |
2021年 | 261篇 |
2020年 | 152篇 |
2019年 | 240篇 |
2018年 | 284篇 |
2017年 | 217篇 |
2016年 | 230篇 |
2015年 | 289篇 |
2014年 | 430篇 |
2013年 | 695篇 |
2012年 | 977篇 |
2011年 | 1124篇 |
2010年 | 593篇 |
2009年 | 525篇 |
2008年 | 1001篇 |
2007年 | 1055篇 |
2006年 | 1001篇 |
2005年 | 1002篇 |
2004年 | 980篇 |
2003年 | 890篇 |
2002年 | 837篇 |
2001年 | 119篇 |
2000年 | 106篇 |
1999年 | 140篇 |
1998年 | 209篇 |
1997年 | 154篇 |
1996年 | 131篇 |
1995年 | 122篇 |
1994年 | 105篇 |
1993年 | 94篇 |
1992年 | 73篇 |
1991年 | 62篇 |
1990年 | 66篇 |
1989年 | 72篇 |
1988年 | 59篇 |
1987年 | 47篇 |
1986年 | 53篇 |
1985年 | 53篇 |
1984年 | 66篇 |
1983年 | 82篇 |
1982年 | 73篇 |
1981年 | 77篇 |
1980年 | 65篇 |
1979年 | 48篇 |
1978年 | 52篇 |
1977年 | 43篇 |
1976年 | 37篇 |
1975年 | 32篇 |
1974年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Most midwives are aware of the need to collect clinical practice data and of its usefulness in supporting the care they provide, which contributes to healthy outcomes for mothers and babies. For the individual midwife, there is more than one easily accessible, standardized data collection instrument from which to choose. However, despite these choices, in an American College of Nurse-Midwives (ACNM) Division of Research (DOR) survey on midwifery clinical data collection (N = 263), the majority of member respondents (n = 135; 51%) reported using a self-designed data collection tool, and more than one-third did not know of the ACNM Nurse-Midwifery Clinical Data Sets (NMCDS). On a larger scale, the midwifery profession is also in need of an organized and consistent approach to data collection for the purpose of capturing midwifery practice and outcomes in order to provide data to support legislation, practice, and policy changes. However, the profession currently lacks a single common midwifery practice database. In order to facilitate data aggregation that captures a larger view of midwifery practice at the local, regional, and national levels, it is imperative that all midwives collect relevant data that are uniform and standardized, and that the midwifery professional organizations move forward with the development of a common electronic database. This article describes currently available data collection tools as well as their best uses, applications to practice, and future directions. 相似文献
82.
83.
84.
Nicotinamide riboside, an NAD+ precursor, has been attracting a lot of attention in recent years due to its potential benefits against multiple metabolic complications and age-related disorders related to NAD+ decline in tissues. The metabolic programming activity of NR supplementation in early-life stages is much less known. Here, we studied the long-term programming effects of mild NR supplementation during the suckling period on lipid and oxidative metabolism in skeletal muscle and liver tissues using an animal model. Suckling male mice received a daily oral dose of NR or vehicle (water) from day 2 to 20 of age, were weaned at day 21 onto a chow diet, and at day 90 were distributed to either a high-fat diet (HFD) or a normal-fat diet for 10 weeks. Compared to controls, NR-treated mice were protected against HFD-induced triacylglycerol accumulation in skeletal muscle and displayed lower triacylglycerol levels and steatosis degree in the liver and distinct capacities for fat oxidation and decreased lipogenesis in both tissues, paralleling signs of enhanced sirtuin 1 and AMP-dependent protein kinase signaling. These pre-clinical findings suggest that mild NR supplementation in early postnatal life beneficially impacts lipid and energy metabolism in skeletal muscle and liver in adulthood, serving as a potential preventive strategy against obesity-related disorders characterized by ectopic lipid accumulation. 相似文献
85.
86.
Jonathan D. Gitlin Joan I. Gitlin David Gitlin 《Arthritis \u0026amp; Rheumatology》1977,20(8):1491-1499
Synovial biopsies from 8 patients with rheumatoid arthritis, 2 patients with degenerative osteoarthritis, and 4 patients with nonarthritic disease were studied for localization of C-reactive protein (CRP) using immuno-fluorescence microscopy. The nuclei of many synoviocytes and histiocytes in rheumatoid synovial membrane were found to bind CRP. Cultures of rheumatoid synovium in 14C-labeled amino acids produced radioactive IgG, IgM, IgA, and C3, but not CRP, indicating the synovial-bound CRP was not of local origin. A few CRP-binding nuclei were present in one osteoarthritic synovium, but none was found in the other and none in synovium from the 4 non-arthritic patients. The nature of the nuclear CRP ligand in rheumatoid synovium was not determined. 相似文献
87.
88.
Lisa Lieberman Una Diffley Sandy King Shelley Chanler Maryanne Ferrara Oscar Alleyne Joan Facelle 《American journal of public health》2013,103(11):1942-1948
In 2000, Rockland County, a small suburban county north of New York City, dedicated $1 million of its Master Settlement Agreement funds to a comprehensive tobacco control program, Put It Out Rockland. Developed and implemented by the county health department, this program used an essential public health services model and an ongoing financial investment, within the context of strong statewide tobacco control efforts, to lower adult smoking rates to 9.7% and to reduce both smoking among youths and exposure to secondhand smoke over the ensuing decade. By combining state funds and local dollars for a total of $6.75 cost per capita, this comprehensive effort yielded 11 000 fewer smokers and translated to a potential savings of more than $24 million for the county. 相似文献
89.
90.
A stratified random sample of midlife Baby Boom women, ages 35–42, was compared with a group of older midlife women, ages 43‐. 55. The sample consisted of 992 women who had graduated between the years of 1955 and 1975 from a large university in southern California. Measures of anxiety and life satisfaction were administered to each year group. This served to control for the effect of age and was helpful in explaining whether the differences between the groups were age related or the result of socialization. The Baby Boom cohort of women, born after January 1, 1946, have only recently entered the ranks of midlife. They have been recognized as unique and less traditional than their older counterparts with regard to sexual freedom, career choices, and educational opportunities. Similarities and differences were found between the two groups of women. However, the results clearly revealed that the effects of socialization, rather than age, yielded the major significant variables influencing a feeling of well‐being in both cohorts of midlife women. 相似文献