全文获取类型
收费全文 | 701篇 |
免费 | 27篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 77篇 |
妇产科学 | 21篇 |
基础医学 | 76篇 |
口腔科学 | 11篇 |
临床医学 | 83篇 |
内科学 | 157篇 |
皮肤病学 | 23篇 |
神经病学 | 10篇 |
特种医学 | 139篇 |
外科学 | 57篇 |
综合类 | 16篇 |
预防医学 | 17篇 |
眼科学 | 4篇 |
药学 | 15篇 |
肿瘤学 | 22篇 |
出版年
2021年 | 6篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 12篇 |
2017年 | 2篇 |
2016年 | 5篇 |
2015年 | 12篇 |
2014年 | 16篇 |
2013年 | 16篇 |
2012年 | 14篇 |
2011年 | 22篇 |
2010年 | 28篇 |
2009年 | 20篇 |
2008年 | 24篇 |
2007年 | 18篇 |
2006年 | 23篇 |
2005年 | 13篇 |
2004年 | 9篇 |
2003年 | 9篇 |
2002年 | 4篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 8篇 |
1998年 | 36篇 |
1997年 | 47篇 |
1996年 | 46篇 |
1995年 | 36篇 |
1994年 | 21篇 |
1993年 | 24篇 |
1992年 | 9篇 |
1991年 | 16篇 |
1990年 | 13篇 |
1989年 | 18篇 |
1988年 | 27篇 |
1987年 | 27篇 |
1986年 | 27篇 |
1985年 | 15篇 |
1984年 | 6篇 |
1983年 | 8篇 |
1982年 | 6篇 |
1981年 | 15篇 |
1980年 | 6篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 9篇 |
1976年 | 5篇 |
1975年 | 10篇 |
1974年 | 2篇 |
1968年 | 2篇 |
1967年 | 2篇 |
排序方式: 共有730条查询结果,搜索用时 15 毫秒
81.
82.
EA van Straaten L Koster-Kamphuis IM Bovee-Oudenhoven R van der Meer P-Ph Forget 《Acta paediatrica (Oslo, Norway : 1992)》1999,88(5):528-531
BACKGROUND: Nitric oxide (NO) production catalyzed by iNOS (inducible NO synthase) is thought to take place mainly in macrophages after activation by inflammatory mediators. NO is subsequently oxidized to nitrite and nitrate, which are excreted in urine. The concentration of inflammatory mediators in small bowel biopsy specimens from patients with coeliac disease is increased. The latter could induce increased NO production by stimulation of intestinal macrophage iNOS, resulting in high levels of urinary NO oxidation products, nitrite and nitrate (NOx). AIM: In the present study we evaluated the urinary NOx/creatinine ratios in children with active coeliac disease (n = 22), coeliac disease patients on a gluten-free diet (n = 9), healthy (n = 11) and sick control children (n = 18). METHODS: The Griess reagent method was used for measuring urinary NOx. RESULTS: Median NOx/creatinine ratios of active coeliac disease patients, coeliac disease patients on a gluten-free diet, healthy and sick control patients were 1.21, 0.19, 0.10 and 0.13 mmol/mmol, respectively. All active coeliac disease patients showed increased NOx/ creatinine ratios. Urinary NOx/creatinine ratios of the active coeliac disease patients were significantly higher than those of healthy controls (p < 0.0001), sick controls (p < 0.0001) and coeliac disease patients on a gluten-free diet (p < 0.0001). CONCLUSION: The urinary NOx/creatinine ratio is increased in patients with active coeliac disease and reverts to normal on a gluten-free diet. 相似文献
83.
Rebecca A. Judd Kathleen B. Digre Judith EA Warner Susan F. Schulman Bradley J. Katz 《Neuro-ophthalmology (Aeolus Press)》2013,37(3):49-54
This study assessed photophobia in patients with benign essential blepharospasm (BEB), and determined the impact of blepharospasm on activities of daily living. Utilizing a patient–researcher collaborative approach, this study was conducted in partnership with the Benign Essential Blepharospasm Research Foundation. Of 316 respondents, 94% reported light sensitivity and 25% reported severe activity limitations. Photophobia appears to be more prominent in BEB than previously thought. Light exacerbates and triggers symptoms that compromise quality of life by affecting daily activities. Collaboration with self-advocates can be an effective way to conduct questionnaire-based research. The authors recommend development of other studies that use this type of partnership. 相似文献
84.
Bretan PN Jr; Vigneron DB; Hricak H; McClure RD; Yen TS; Moseley M; Tanagho EA; James TL 《Radiology》1987,162(3):867-871
To evaluate the reliability of phosphorus-31 magnetic resonance (MR) spectroscopy in the assessment of acute testicular ischemia, vascular integrity, and spermatogenesis, the authors studied in vivo canine and primate testicles grouped as follows: group 1 testes (n = 8), in situ canine controls; group 2 (n = 11), canine testes subjected to warm ischemia; group 3, canine (n = 4) and primate (n = 4) testicles from hormone-treated animals. Group 1 control testicles showed high monophosphoester (MP) levels; low levels of inorganic phosphate (Pi), phosphodiester (PD), and phosphocreatine; and high levels of adenosine triphosphate (ATP). Group 2 testes revealed a time-dependent decay of MP/Pi ratios (from 2.1 to 0.70). Regeneration of ATP was noted in the acute reperfusion period. After 6 weeks of pituitary gonadotropin suppression, group 3 testes showed a significant decrease (P less than .05) in MP/PD ratios from a control level of 2.6 +/- 0.3 and a decrease in the MP/beta-ATP ratio from 2.4 +/- 0.1 to 1.8 +/- 0.3. P-31 MR spectroscopy appears to be a potential method for noninvasively assessing testicular ischemic injury and the metabolic integrity of spermatogenesis. 相似文献
85.
86.
87.
88.
89.
E A Liechty M J Bull C Q Bryson J E Kalsbeck R D Jansen J A Lemons R L Schreiner 《Child's brain》1983,10(5):340-349
All infants of less than 1,500 g birth weight who required a ventriculo-peritoneal shunt were followed for developmental problems over the 1st year of life. There were 19 infants; 2 died within the 1st postoperative week. At 1 year of age corrected for prematurity the mean Bayley Mental Developmental Index was 62 +/- 23.0, and the mean Psychomotor Developmental Index was 61 +/- 19. Only 2 infants attained scores greater than 85 on both scales, while an additional 2 infants attained a score of greater than 85 on one scale. It is concluded that ventriculo-peritoneal shunting procedures performed after progressive ventricular enlargement has taken place are not likely to result in normal development of the infant less than 1,500 g birth weight. 相似文献
90.
Gastroplasty, a newer form of surgery for morbid obesity, produces physical and psychosocial benefits equivalent to those of jejunoileal bypass, but with fewer complications. As interest in this approach to intractable obesity has increased, surgeons have looked to psychiatrists to help them to assess psychiatric risk associated with undergoing surgery. Drawing on a review of the literature and long-term experience with patients requesting gastroplasty, this review addresses the benefits of gastroplasty and offers suggestions about when and how to perform preoperative psychiatric evaluations in patients requesting surgery for obesity. 相似文献