全文获取类型
收费全文 | 19126篇 |
免费 | 2174篇 |
国内免费 | 47篇 |
专业分类
耳鼻咽喉 | 302篇 |
儿科学 | 761篇 |
妇产科学 | 521篇 |
基础医学 | 2751篇 |
口腔科学 | 618篇 |
临床医学 | 2376篇 |
内科学 | 3774篇 |
皮肤病学 | 211篇 |
神经病学 | 1116篇 |
特种医学 | 714篇 |
外科学 | 2690篇 |
综合类 | 487篇 |
一般理论 | 18篇 |
预防医学 | 2018篇 |
眼科学 | 392篇 |
药学 | 1429篇 |
中国医学 | 87篇 |
肿瘤学 | 1082篇 |
出版年
2021年 | 272篇 |
2019年 | 222篇 |
2018年 | 305篇 |
2017年 | 224篇 |
2016年 | 251篇 |
2015年 | 262篇 |
2014年 | 427篇 |
2013年 | 606篇 |
2012年 | 889篇 |
2011年 | 934篇 |
2010年 | 496篇 |
2009年 | 403篇 |
2008年 | 798篇 |
2007年 | 860篇 |
2006年 | 827篇 |
2005年 | 821篇 |
2004年 | 735篇 |
2003年 | 718篇 |
2002年 | 641篇 |
2001年 | 648篇 |
2000年 | 595篇 |
1999年 | 596篇 |
1998年 | 238篇 |
1997年 | 258篇 |
1996年 | 240篇 |
1995年 | 209篇 |
1994年 | 202篇 |
1993年 | 164篇 |
1992年 | 461篇 |
1991年 | 446篇 |
1990年 | 409篇 |
1989年 | 389篇 |
1988年 | 390篇 |
1987年 | 367篇 |
1986年 | 369篇 |
1985年 | 368篇 |
1984年 | 276篇 |
1983年 | 261篇 |
1982年 | 193篇 |
1981年 | 192篇 |
1979年 | 258篇 |
1978年 | 211篇 |
1977年 | 181篇 |
1976年 | 158篇 |
1975年 | 161篇 |
1974年 | 193篇 |
1973年 | 213篇 |
1972年 | 168篇 |
1971年 | 161篇 |
1970年 | 161篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
1.
Megan L. Robbins Robert C. Wright Ana María López Karen Weihs 《Journal of psychosocial oncology》2019,37(2):160-177
AbstractObjectives: This study examined word use as an indicator of interpersonal positive reframing in daily conversations of couples coping with breast cancer and as a predictor of stress.Design: The Electronically Activated Recorder (EAR) and Linguistic Inquiry and Word Count (LIWC) were used to examine naturally occurring word use conceptually linked to positive reframing (positive emotion, negative emotion, and cognitive processing words).Sample: Fifty-two couples coping with breast cancer.Methods: Couples wore the EAR, a device participants wear, that audio-recorded over one weekend (>16,000 sound files), and completed self-reports of positive reframing (COPE) and stress (Perceived Stress Scale). LIWC, a software program, measured word use.Findings: Both partners’ word use (i.e., positive emotion and cognitive processing words) was associated with their own reported positive reframing, and spouses’ word use was also indicative of patients’ positive reframing. Results also revealed that, in general, words indicating positive reframing predicted lower levels of stress.Conclusions: Findings supported the hypothesis that partners—and particularly spouses of breast cancer patients—may assist each other’s coping by positively reframing the cancer experience and other negative experiences in conversation. 相似文献
2.
3.
4.
Nawf Sharief Judith E. Kingston Vanessa M. Wright Kate Costeloe 《Pediatric hematology and oncology》1991,8(4):323-327
We describe a familial case of Marfan's syndrome with associated intrathoracic stomach detected during the neonatal period. The patient developed a primitive leukemia at 3 months of age. Acute leukemia in a patient with Marfan's syndrome has not previously been reported. 相似文献
5.
Summary— KR31080 (2-butyl-5-methyl-6-(1-oxopyridin-2-yl)-3-[[2'-(1H-tetrazol-5-yl) biphenyl-4-yl]methyl]-3H-imidazo[4,5-b] pyridine) is a potent inhibitor of angiotensin type 1 (AT1 ) receptors in rabbit aorta and human recombinant AT1 receptors. In the isolated rabbit thoracic aorta, KR31080 caused a nonparallel shift to the right of the concentration-response curves to angiotensin II (All) with decreased maximal response (pD'2 = 10.1 ± 0.1), but had no effect on the contractile response induced by norepinephrine. KR31080 inhibited specific [125 I]AII binding to rabbit aortic membranes (AT, receptors) and [125 I][Sar1 , Ile8 ]AII binding to human recombinant AT1 receptors in a concentration-dependent manner with IC50 values of 0.84 ± 0.08 nM and 1.92 ± 0.15 nM, respectively, but did not inhibit specific [125 I)AII binding to bovine cerebellum membranes (ÀT2 receptors). In the Scatchard analysis, KR31080 interacted with rabbit aortic AT1 receptors in a competitive manner, similar to losartan. These results demonstrate that KR31080 is a potent and AT1 selective angiotensin receptor antagonist which exerts a competitive antagonism in the [125 I]AII binding assay and insurmountable AT1 receptor antagonism in the functional study. 相似文献
6.
Gavin Wright 《ANZ journal of surgery》2005,75(11):952-952
7.
Two hundred and thirty pregnancies were studied in 196 diabetic women. Seven women with babies found to have major malformations had a higher median first trimester haemoglobin A1 (12.9%) than the median HbA1 (10.8%) in those with normal babies (p = 0.06). No relationship was found between the occurrence of minor malformations and first trimester maternal haemoglobin A1. Two of the seven congenital malformations were diagnosed antenatally at a time when therapeutic abortion could be offered. Expert antenatal ultrasound scanning should be offered to all pregnant diabetic women as poor glycaemic control at the time of conception and organogenesis, as evidenced by raised first trimester HbA1, predisposes to congenital malformation. 相似文献
8.
9.
The interaction of an organic acid with sodium bicarbonate in water produces an effervescent reaction. The reaction products are carbon dioxide, water, and the sodium salt of the acid. The kinetic rate-determining step for this reaction is the dehydration of carbonic acid. The solid-solid interaction with known amounts of moisture was followed by quantitatively determining carbon dioxide evolution as a function of time. The aqueous solubilities, diffusion coefficients, dissociation constants, and solid-solid interaction rates of six different substituted benzoic acids were determined. Using a model based on diffusion of the organic acid through the aqueous layer coupled with chemical reaction, predicted rates and levels of carbon dioxide production were compared with experimental results. Included in the model were the effects of the reaction products on the solution properties of the reactants. It was found that high concentrations of substituted sodium benzoate were generated very quickly and affected the solubility of the reactants, diffusion coefficient of the acid, and the carbonic acid dehydration rate constant. Moisture content was found to have a profound influence on the interaction rate. Water provides a medium for diffusion of the reacting species as well as the reaction solvent. 相似文献
10.
Wright RE 《The British journal of ophthalmology》1940,24(11):547-559