全文获取类型
收费全文 | 2372646篇 |
免费 | 168456篇 |
国内免费 | 5308篇 |
专业分类
耳鼻咽喉 | 32038篇 |
儿科学 | 77977篇 |
妇产科学 | 65254篇 |
基础医学 | 336357篇 |
口腔科学 | 67735篇 |
临床医学 | 208778篇 |
内科学 | 466537篇 |
皮肤病学 | 53015篇 |
神经病学 | 185413篇 |
特种医学 | 91186篇 |
外国民族医学 | 562篇 |
外科学 | 363278篇 |
综合类 | 53834篇 |
现状与发展 | 4篇 |
一般理论 | 752篇 |
预防医学 | 175108篇 |
眼科学 | 56240篇 |
药学 | 172128篇 |
7篇 | |
中国医学 | 5674篇 |
肿瘤学 | 134533篇 |
出版年
2019年 | 18003篇 |
2018年 | 26097篇 |
2017年 | 20034篇 |
2016年 | 21845篇 |
2015年 | 24936篇 |
2014年 | 34979篇 |
2013年 | 51895篇 |
2012年 | 71208篇 |
2011年 | 75296篇 |
2010年 | 44994篇 |
2009年 | 42280篇 |
2008年 | 70666篇 |
2007年 | 75210篇 |
2006年 | 75748篇 |
2005年 | 72942篇 |
2004年 | 70262篇 |
2003年 | 67227篇 |
2002年 | 65276篇 |
2001年 | 119061篇 |
2000年 | 121982篇 |
1999年 | 101618篇 |
1998年 | 27138篇 |
1997年 | 24043篇 |
1996年 | 24086篇 |
1995年 | 22932篇 |
1994年 | 21269篇 |
1993年 | 19713篇 |
1992年 | 77627篇 |
1991年 | 74771篇 |
1990年 | 72261篇 |
1989年 | 69533篇 |
1988年 | 63744篇 |
1987年 | 62322篇 |
1986年 | 59115篇 |
1985年 | 56057篇 |
1984年 | 41555篇 |
1983年 | 35297篇 |
1982年 | 20315篇 |
1979年 | 37191篇 |
1978年 | 25793篇 |
1977年 | 21916篇 |
1976年 | 20444篇 |
1975年 | 21942篇 |
1974年 | 26485篇 |
1973年 | 25481篇 |
1972年 | 23769篇 |
1971年 | 22026篇 |
1970年 | 20709篇 |
1969年 | 19405篇 |
1968年 | 18215篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Oncologic screenings of the populations in the areas with increased incidence of esophageal cancer have revealed Barrett's ulcer in 1 percent of the examinees. Endoscopic and cytologic characteristics of this condition are presented. Precancer changes--severe dysplasia--are most frequent in male Kazakhs (14.1 percent) aged 50 to 59 (14.7 percent). Subjects with Barrett's ulcer developing severe dysplasia, as evidenced by cytograms, should be included in the group of subjects at risk for carcinoma of the lower third of the esophagus and cardia. 相似文献
992.
993.
Serum aminogram changes were prospectively studied in 95 patients with enteric fistula and intraabdominal infection who was under total parenteral nutrition (TPN) therapy with Anfuming 14s. In patients with sepsis and starvation, the aminogram showed remarkably low total free amino acids before TPN therapy. In 81 survivors, free amino acids increased gradually to normal in 2 weeks after use of TPN and in 14 dead cases increased rapidly to a significantly higher peak at terminal stage. Both in survivors and nonsurvivors, phenylalanine level remained high during the study. In response to infection, proline was also elevated but to a lesser degree; the ratio of branched chain amino acid (BCAA) to aromatic amino acid (AAA) was lower than normal and the decrease of arginine was parallel to the severity of infection. We conclude that the ideal amino acids preparation for the starvated and septic patients should be high in BCAA and arginine but low in phenylalanine, administration of inappropriate exogenous amino acids in decompensated metabolic septic patients may bring about more harm than benefit, and in septic patients that the levels of serum phenylalanine and proline are elevated persistently along with the decrease of arginine level is a useful prognostic indication. 相似文献
994.
995.
J. Saßmannshausen N. Bornfeld A. Kluge W. Sauerwein F. Härting A. Wessing 《International ophthalmology》1989,13(4):243-251
Advanced malignant melanomas of the uvea unsuited for an eye salvaging approach require enucleation of the tumor containing eye. A series of 68 patients is reported who underwent enucleation combined with insertion of a spherical dura-encased implant after 30 Gray pre-irridiation therapy of the orbit. Postoperative results with special attention to cosmetic outcome and motility of the prosthesis suggest that the insertion of an orbital implant should be preferred to the enucleation with no implant. 相似文献
996.
M K Song W Y Shin N F Adham N V Costea 《The American journal of clinical nutrition》1989,49(4):701-707
The effects of different amounts of dietary zinc on the Zn absorption rate and on Zn, calcium and magnesium concentrations in tissues of MOPC 104E tumor-bearing Balb/c mice were determined. The Zn absorption rate was inversely related to the amounts of Zn in their diets and was lower than that of nontumor-bearing control mice fed a laboratory mice chow. Zn concentrations of tumor-bearing mice were also low compared with control mice but tumor Zn concentrations, regardless of the concentrations of Zn in the diets, were higher than those of normal tissues of the host other than the pancreas. Ca concentrations in tumor and tissues of tumor-bearing mice were higher than in control animals but Mg concentrations in tissues of tumor-bearing mice appeared to be similar to those of control mice. Results suggest that tumor-bearing mice have a lower intestinal Zn absorption capacity and a higher Zn uptake rate causing other tissues to become hypozincemic and hypercalcemic. 相似文献
997.
998.
The contractile response of isolated guinea pigs common bile ducts (CBD) to transmural electrical stimulation and the effects of morphine and naloxone was studied. Contractile responses increased as a function of stimulus frequency. In the absence of naloxone morphine inhibited the contractile response to electrical stimulation in a dose-dependent manner. Naloxone prevented the inhibitory effect of morphine on the contractile response to electrical stimulation. We conclude that smooth muscle of the CBD in guinea pig is functional and can contribute to biliary motility, and that opiate receptors exist in nerve elements in the CBD. 相似文献
999.
T. S. Lie M. Höfer Ch. Höhnke 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》1987,372(1):893-894
Zusammenfassung Bei einem 55jährigen Mann wurde 7 Monate nach orthotoper Lebertransplantation eine Lungentuberkulose diagnostiziert. Die tuberculostatische Therapie erfolgte mit Isoniazid (3 x 0,2 g/Wo) und Ethambutol (1,6 g/d) über 11 Monate. Nach 3 Monaten waren keine Mycobakte rien mehr nachweisbar, und der Patient ist im 3. Jahr nach Transplantation ohne Zeichen einer aktiven Tuberkulose in gutem Gesundheitszustand bei guter Transplantatfunktion. Die Tuberculostatica-Dosierung sollte je nach Metabolisierungsleistung des Transplantats reduziert werden. Bei Beachtung dieses Kardinalpunktes könnte eine Tuberkulose nach Lebertransplantation erfolgreich behandelt werden. 相似文献
1000.