全文获取类型
收费全文 | 1630篇 |
免费 | 113篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 54篇 |
妇产科学 | 27篇 |
基础医学 | 172篇 |
口腔科学 | 71篇 |
临床医学 | 151篇 |
内科学 | 378篇 |
皮肤病学 | 23篇 |
神经病学 | 126篇 |
特种医学 | 69篇 |
外科学 | 184篇 |
综合类 | 46篇 |
一般理论 | 3篇 |
预防医学 | 135篇 |
眼科学 | 35篇 |
药学 | 143篇 |
中国医学 | 5篇 |
肿瘤学 | 125篇 |
出版年
2023年 | 21篇 |
2022年 | 60篇 |
2021年 | 85篇 |
2020年 | 49篇 |
2019年 | 63篇 |
2018年 | 93篇 |
2017年 | 46篇 |
2016年 | 46篇 |
2015年 | 54篇 |
2014年 | 59篇 |
2013年 | 69篇 |
2012年 | 125篇 |
2011年 | 100篇 |
2010年 | 80篇 |
2009年 | 70篇 |
2008年 | 80篇 |
2007年 | 87篇 |
2006年 | 76篇 |
2005年 | 83篇 |
2004年 | 56篇 |
2003年 | 73篇 |
2002年 | 54篇 |
2001年 | 25篇 |
2000年 | 19篇 |
1999年 | 16篇 |
1998年 | 19篇 |
1997年 | 5篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1993年 | 7篇 |
1992年 | 14篇 |
1991年 | 9篇 |
1990年 | 11篇 |
1989年 | 6篇 |
1988年 | 6篇 |
1987年 | 8篇 |
1986年 | 8篇 |
1985年 | 7篇 |
1984年 | 7篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 3篇 |
1973年 | 4篇 |
1970年 | 3篇 |
1968年 | 2篇 |
排序方式: 共有1754条查询结果,搜索用时 15 毫秒
101.
102.
Background
There are limited data about the epidemiology and risk factors/indicators of gingivitis, aggressive periodontitis (AgP) and chronic periodontitis (CP) in Jordan. The aim of this study was to assess the prevalence and risk indicators of gingivitis, AgP and CP. 相似文献103.
S Krichen Makni K Abbes A Khanfir M Frikha T Sellami Boudawara 《Cancer radiothérapie》2007,11(5):276-279
Metastatic tumors in the breast are quite rare and constitute 0.5 to 6% of all breast malignancies. They often occur in a polymetastatic context. The most frequent primitive tumors are lymphoma, leukaemia and malignant melanoma. The gastric origin is seldom reported. We report here the observation of a 40-years woman operated in urgency for an acute abdominal syndrome. A gastric tumor was discovered intraoperatively with ovarian metastasis and peritoneal carcinosis. The pathological examination revealed a gastric signet ring cell carcinoma with an infiltration of the right ovary. Four months later, the patient presented with a lump of the right breast. The histologic examination corresponded to a mammary metastasis by a signet ring cell carcinoma from stomach. The objective of our work is to discuss through this observation the anatomoclinical and evolutionary characteristics of breast metastasis. 相似文献
104.
R. Kallel S. Krichen Makni S. Ellouze S. Chaabouni I. Chtourou B. Ben Ayed A. Khanfir M. Guermazi T. Sallemi Boudawara 《Oncologie》2008,10(9):563-567
Juvenile granulosa cell tumor of the ovary is a rare neoplasm that makes up less than 5% of ovarian tumors in childhood and adolescence. The majority of they tumors are diagnosed in stage I (FIGO) with a favorable prognosis. The aim of this work was to describe the pathological, clinical and therapeutic features of this rare tumor of ovary. The authors describe a juvenile cell tumor expressed by an abdominal and genital syndrome occurring in 30 and 35-year-old two young females. The tumor was strictly localized in the ovary in one case; the second patient presented a bilateral ovarian tumor and peritoneal metastasis at the diagnosis. Clinical follow-up of the latter patient showed a recurrence with liver metastasis in spite of a radical surgical treatment followed by chemotherapy. The first patient has a favorable evolution with a follow-up of two years. Various prognostic factors of the juvenile granulosa cell tumor of the ovary are currently being evaluated. Surgery is the treatment for local disease. Patients with locally advanced, recurrent or metastatic tumors require chemotherapy, although the optimal regimen remains to be determined. 相似文献
105.
Ignjatovic I Potic B Paunkovic L Ravangard Y 《International urology and nephrology》2002,34(1):113-115
Automutilation of the penis performed by the kitchen's knife is described. Surgical techniques, the most important goals of therapy as well as psychiatric aspects of the automutilation are discussed. 相似文献
106.
Dietary zinc deficiency induced-changes in the activity of enzymes and the levels of free radicals,lipids and protein electrophoretic behavior in growing rats 总被引:11,自引:0,他引:11
Zinc (Zn) is an essential nutrient that is required in humans and animals for many physiological functions, including immune and antioxidant function, growth and reproduction. The present study was conducted to investigate the effects of adequate Zn level (38 mg/kg diet, as a control) and two low levels that create Zn deficiencies (19 mg/kg diet, 1/2 of the control and 3.8 mg/kg diet, 1/10 of the control) in growing male and female rats for 10 weeks. To evaluate the effects of these levels, the concentrations of thiobarbituric acid-reactive substances (TBARS), biochemical parameters and protein pattern were studied. Lipid peroxidation in liver, brain and testes of rats fed Zn-deficient diet was indicated by increased TBARS. Serum, liver, brain and testes glutathione S-transferase (GST) activities were significantly (P<0.05) increased in Zn-deficient rats, the effect was pronounced in rats fed the lowest level of Zn (1/10 of control). The activity of lactate dehydrogenase (LDH) was significantly (P<0.05) increased in liver, brain and testes, but decreased in serum in a dose-dependent manner. Zinc deficiency increased (P<0.05) liver aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities in a dose-dependent manner, while there was no effect on the activity of these enzymes in testes. Zinc deficiency resulted in a significant (P<0.05) decrease in the activity of alkaline phosphatase (AlP) in serum and liver in a dose-dependent manner, but no effect in testes was found. The activity of acid phosphatase (AcP) was not affected in serum, liver and testes. Zn-deficient rats had higher liver concentrations of total lipids (TL), cholesterol, triglyceride (TG), and low density lipoprotein (LDL), while high density lipoprotein (HDL) was significantly (P<0.05) declined in a dose-dependent manner. Brain and serum acetylcholinesterase (AChE) activities were, however, not affected (P<0.05) by Zn deficiency. Protein content in liver, brain and testes showed a significant (P<0.05) decrease in rats fed the lowest level of Zn (1/10 of control). Polyacrylamide gel electrophoresis (native-PAGE) of serum proteins revealed that the intensity of immunoglobulins, serum albumin as well as several peptide bands were decreased in rats fed 1/2 or 1/10 of Zn adequate, i.e. their synthesis was affected and it was pronounced with the lowest level of Zn deficiency (1/10 of control). However, no clear effect on the transferrin was observed in both cases compared to controls. From the results of this study it can be concluded that Zn deficiency exerts numerous alterations in the studied biochemical parameters, protein pattern, and increased lipid peroxidation. 相似文献
107.
Biliary,fecal and plasma deoxycholic acid in rabbit,hamster, guinea pig,and rat: comparative study and implication in colon cancer 总被引:2,自引:0,他引:2
Kasbo J Saleem M Perwaiz S Mignault D Lamireau T Tuchweber B Yousef I 《Biological & pharmaceutical bulletin》2002,25(10):1381-1384
Bile acids are believed to play a role in the etiology of colorectal cancer, and high fecal excretion of secondary bile acids was correlated with increased incidence of colon cancer. Recently, it was also reported that there is an increase in plasma of the secondary bile acid, deoxycholic acid in men with colorectal adenomas. Since deoxycholic acid is formed in the colon and absorbed into the portal systemic circulation, it was suggested that the blood concentration of this bile acid reflects the level of exposure of colonic cells to deoxycholic acid. The objective of this study was to investigate whether plasma deoxycholic acid level represents the fecal content of this bile acid in several animal species with different bile acid composition and deoxycholic acid contribution to the bile acid pool. Eight rabbits, hamsters, guinea pigs, and rats were used in this study. Blood samples and feces were collected on days 1, 3, 5 and 7. Bile samples were obtained only on day 7. The plasma, fecal and biliary bile acids were analyzed by gas chromatography-mass spectrometry. Bile acid composition and deoxycholic acid content varied greatly between the animal species studied. There was a variation in the concentration of total bile acids in the plasma and feces obtained at different times during the experiments, however, the bile acids profile remained constant throughout the study. The data obtained shows that although plasma bile acid profile was not similar to fecal bile acids profile, however, there was a significant correlation between the level of plasma and fecal deoxycholic acid. Plasma deoxycholic acid concentration might be a reliable biomarker for the degree of exposure of colon cells to this bile acid, and may be useful in further studies on the role of secondary bile acids in colon carcinogenesis. 相似文献
108.
109.
110.