全文获取类型
收费全文 | 4480篇 |
免费 | 416篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 39篇 |
儿科学 | 118篇 |
妇产科学 | 57篇 |
基础医学 | 827篇 |
口腔科学 | 108篇 |
临床医学 | 524篇 |
内科学 | 614篇 |
皮肤病学 | 87篇 |
神经病学 | 477篇 |
特种医学 | 127篇 |
外科学 | 794篇 |
综合类 | 133篇 |
一般理论 | 6篇 |
预防医学 | 372篇 |
眼科学 | 51篇 |
药学 | 356篇 |
中国医学 | 2篇 |
肿瘤学 | 212篇 |
出版年
2023年 | 30篇 |
2022年 | 52篇 |
2021年 | 129篇 |
2020年 | 74篇 |
2019年 | 145篇 |
2018年 | 166篇 |
2017年 | 150篇 |
2016年 | 141篇 |
2015年 | 115篇 |
2014年 | 170篇 |
2013年 | 259篇 |
2012年 | 385篇 |
2011年 | 406篇 |
2010年 | 201篇 |
2009年 | 187篇 |
2008年 | 326篇 |
2007年 | 315篇 |
2006年 | 292篇 |
2005年 | 237篇 |
2004年 | 189篇 |
2003年 | 160篇 |
2002年 | 173篇 |
2001年 | 50篇 |
2000年 | 47篇 |
1999年 | 37篇 |
1998年 | 30篇 |
1997年 | 21篇 |
1996年 | 19篇 |
1995年 | 25篇 |
1994年 | 17篇 |
1993年 | 10篇 |
1992年 | 21篇 |
1991年 | 16篇 |
1990年 | 19篇 |
1989年 | 20篇 |
1988年 | 15篇 |
1987年 | 15篇 |
1986年 | 19篇 |
1985年 | 18篇 |
1980年 | 9篇 |
1979年 | 10篇 |
1978年 | 11篇 |
1975年 | 11篇 |
1973年 | 9篇 |
1972年 | 10篇 |
1971年 | 12篇 |
1970年 | 13篇 |
1969年 | 9篇 |
1968年 | 10篇 |
1966年 | 10篇 |
排序方式: 共有4904条查询结果,搜索用时 78 毫秒
1.
2.
3.
Shane S. Bush NAN Policy Planning Committee 《Archives of clinical neuropsychology》2005,20(8):997-1007
Independent forensic neuropsychological examinations are performed by neuropsychologists who are hired as independent contractors by third parties to make determinations regarding neuropsychological functioning. The responsibilities of neuropsychologists when performing independent or court-ordered forensic examinations differ from those of clinical examinations. Because neuropsychological training typically occurs in clinical contexts, the transition to forensic contexts may result in uncertainty about how to negotiate the unique responsibilities of the forensic examiner role. Neuropsychologists are responsible for maintaining the highest standards of professional practice when performing independent and court-ordered forensic examinations. To reach and maintain the highest standards of practice, neuropsychologists must understand the unique relationships with retaining parties and examinees and strive to maintain true independence and objectivity. Although a true neuropsychologist-patient relationship is not considered to exist within the context of a forensic neuropsychological evaluation, neuropsychologists have ethical responsibilities to both the retaining party and the examinee. 相似文献
4.
5.
6.
Azra M. Sehic Lillian W. Gaber Shane Roy III Paula M. Miller Stephen B. Kritchevsky Robert J. Wyatt 《Pediatric nephrology (Berlin, Germany)》1997,11(4):435-437
Based upon the percentage of cases of IgA nephropathy (IgAN) in biopsy series, a lower prevalence has been assumed for African-Americans
compared with Americans of European descent. This may be due to a racial difference in the basic underlying pathology of IgAN
or to racial differences in patterns of referral and biopsy selection practices. Over the past decade (1985 – 1994), we have
found similar incidences of IgAN in Caucasian and African-American children from Shelby County, Tennessee. The incidence was
3.0 cases per million per year for Caucasian and 5.7 cases per million per year for African-American children. IgAN may be
more common in African-American children than previously appreciated. Population-based incidence studies will be necessary
to determine whether or not our experience has become a more widespread phenomenon.
Received August 21, 1996; received in revised form and accepted December 18, 1996 相似文献
7.
Five new N alpha-(5,8-dideazapteroyl)-L-ornithines have been prepared using multistep synthetic sequences. These include N alpha-[5-(trifluoromethyl)-5,8-dideazapteroyl]-L-ornithine, 3, as well as N alpha-[5-(trifluoromethyl)-5,8-dideazaisopteroyl]-L-ornithine, 4, and its 5-fluoro and 5-chloro analogues. Both of the compounds containing a 5-(trifluoromethyl) group (3 and 4) were found to be excellent inhibitors of homogeneous hog liver folylpolyglutamate synthetase, having Ki values in the same range as N alpha-(5-chloro-5,8-dideazapteroyl)-L-ornithine, 2, (approximately 10 nM). However, the bridge-reversed isomer of 2 was 60-fold less inhibitory than 2. 相似文献
8.
H Ohta F I Shane K Endo K Torizuka K Horiuchi A Yokoyama M Ishii 《Clinical nuclear medicine》1986,11(12):842-844
The effectiveness of Tc-99m bleomycin (BLM) and Tc(V)-99m DMSA are compared with that of Ga-67 citrate, which is currently the most widely used agent. In four patients with lipomatous tumors, the clinical significance of tumor imaging with each of these three agents is discussed and compared. Results indicate that both Tc-99m BLM and Tc(V)-99m DMSA are superior in detecting the extension or localization of liposarcomas. 相似文献
9.
Previously, we determined the pattern of stress-induced c-fos mRNA expression throughout the brain in order to gain further insight into the identification of the neural circuits mediating stress-induced regulation of the hypothalamic-pituitary-adrenal axis. In the present study, we determined if rapid effects of increased glucocorticoid levels after stress contribute to changes in c-fos mRNA expression. To this end, stress-induced c-fos expression was characterized in adrenalectomized (ADX) or adrenalectomized and corticosterone replaced (ADX/B) male rats. Animals were sacrificed 30 min post-onset of a 10 min swim stress, and in situ hybridization histochemistry was used to detect c-fos mRNA throughout the brain. The pattern of c-fos induction in the ADX and ADX/B animals was similar to that observed in the sham operated animals. Additionally, densitometric measurements were made to quantify the c-fos response in the paraventricular nucleus of the hypothalamus and the CA1/2 region of the hippocampus. We found that ADX did not alter the magnitude of the c-fos response to stress in these areas, but there was a slight dampening of the response in ADX/B animals. In sum, these results suggest that the pattern of c-fos expression observed 30 min post-stress is independent of stress-induced increases in circulating glucocorticoid concentrations. 相似文献
10.
Shane L. Carney Alastair H. B. Gillies Cheryl D. Ray 《Clinical and experimental pharmacology & physiology》1995,22(9):629-634
1. Despite human and animal studies, the direct effect of ethanol on renal water and electrolyte transport is poorly understood. The acute effect of increasing plasma concentrations of ethanol was evaluated in a water diuretic anaesthetized rat model which inhibits endogenous arginine vaso-pressin (AVP) release. 2. Ethanol at a plasma concentration of 1.69 ±0.28 mmol/L produced an immediate increase in urine flow (174 ± 11 μL/min pre-ethanol and 189 ± 13 and then 206 ± 12 μL/min during the ethanol infusion; P<0.001) as well as an increase in fractional sodium excretion (0.17 ± 0.04 to 0.28 ± 0.05 and 0.27 ± 0.05%; P<0.001). There was also a brief phosphaturia. These increases in electrolyte excretion had returned to control values by 20 min despite a further increase in the plasma ethanol concentration. 3. The urinary excretion of potassium, calcium and magnesium was not altered nor was glomerular filtration rate or renal plasma flow. 4. Ethanol at a mean concentration of 1.60 mmol/L did not alter the action of a maximal concentration of AVP (75 ng/kg) on water or electrolyte transport. However, the antidiuretic effect of a submaximal concentration of AVP (7.5 ng/kg) was augmented by ethanol at concentrations of 1.63 and 0.98 mmol/L. 5. These studies suggest that the ethanol induced diuresis commonly ascribed to inhibition of AVP secretion may also be due to other intrarenal effects of ethanol, possibly acting within the proximal tubule. These results also confirm recent in vitro findings that while ethanol does not inhibit the action of a maximal concentration of AVP, it does modulate the effects of lower AVP concentrations. 相似文献