全文获取类型
收费全文 | 3319篇 |
免费 | 247篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 41篇 |
儿科学 | 106篇 |
妇产科学 | 90篇 |
基础医学 | 429篇 |
口腔科学 | 64篇 |
临床医学 | 285篇 |
内科学 | 788篇 |
皮肤病学 | 49篇 |
神经病学 | 221篇 |
特种医学 | 90篇 |
外科学 | 574篇 |
综合类 | 53篇 |
预防医学 | 259篇 |
眼科学 | 64篇 |
药学 | 229篇 |
中国医学 | 20篇 |
肿瘤学 | 217篇 |
出版年
2023年 | 27篇 |
2022年 | 61篇 |
2021年 | 108篇 |
2020年 | 74篇 |
2019年 | 114篇 |
2018年 | 124篇 |
2017年 | 67篇 |
2016年 | 74篇 |
2015年 | 98篇 |
2014年 | 132篇 |
2013年 | 165篇 |
2012年 | 233篇 |
2011年 | 236篇 |
2010年 | 147篇 |
2009年 | 115篇 |
2008年 | 177篇 |
2007年 | 168篇 |
2006年 | 155篇 |
2005年 | 148篇 |
2004年 | 152篇 |
2003年 | 122篇 |
2002年 | 111篇 |
2001年 | 39篇 |
2000年 | 51篇 |
1999年 | 53篇 |
1998年 | 25篇 |
1997年 | 19篇 |
1996年 | 27篇 |
1995年 | 21篇 |
1994年 | 20篇 |
1993年 | 21篇 |
1992年 | 38篇 |
1991年 | 35篇 |
1990年 | 33篇 |
1989年 | 48篇 |
1988年 | 44篇 |
1987年 | 34篇 |
1986年 | 32篇 |
1985年 | 29篇 |
1984年 | 23篇 |
1983年 | 20篇 |
1982年 | 8篇 |
1981年 | 7篇 |
1980年 | 15篇 |
1979年 | 25篇 |
1978年 | 22篇 |
1977年 | 12篇 |
1976年 | 7篇 |
1974年 | 11篇 |
1973年 | 11篇 |
排序方式: 共有3579条查询结果,搜索用时 15 毫秒
91.
Yousra Ben Khadra MS Cinzia Ferrario MS Cristiano Di Benedetto PhD Khaled Said PhD Francesco Bonasoro PhD M. Daniela Candia Carnevali MS Michela Sugni PhD 《Wound repair and regeneration》2015,23(4):611-622
Starfish can regenerate entire arms following their loss by both autotomic and traumatic amputation. Although the overall regenerative process has been studied several times in different asteroid species, there is still a considerable gap of knowledge as far as the detailed aspects of the repair phase at tissue and cellular level are concerned, particularly in post‐traumatic regeneration. The present work is focused on the arm regeneration model in the Mediterranean red starfish Echinaster sepositus; to describe the early cellular mechanisms of arm regeneration following traumatic amputation, different microscopy techniques were employed. In E. sepositus, the repair phase was characterized by prompt wound healing by a syncytial network of phagocytes and re‐epithelialisation followed by a localized subepidermal oedematous area formation. Scattered and apparently undifferentiated cells, intermixed with numerous phagocytes, were frequently found in the wound area during these first stages of regeneration and extensive dedifferentiation phenomena were seen at the level of the stump, particularly in the muscle bundles. A true localized blastema did not form. Our results confirm that regeneration in asteroids mainly relies on morphallactic processes, consisting in extensive rearrangement of the existing tissues which contribute to the new tissues through cell dedifferentiation, redifferentiation, and/or migration. 相似文献
92.
Comparison of human skeletal myoblasts and bone marrow-derived CD133+ progenitors for the repair of infarcted myocardium 总被引:5,自引:0,他引:5
Agbulut O Vandervelde S Al Attar N Larghero J Ghostine S Léobon B Robidel E Borsani P Le Lorc'h M Bissery A Chomienne C Bruneval P Marolleau JP Vilquin JT Hagège A Samuel JL Menasché P 《Journal of the American College of Cardiology》2004,44(2):458-463
OBJECTIVES: The present study was designed as a face-to-face functional comparison of human skeletal myoblasts (SMs) and CD133(+) bone marrow-derived hematopoietic progenitors in an animal model of semichronic myocardial infarction. BACKGROUND: Compared with SMs, bone marrow-derived cells have the advantage of plasticity and might more effectively regenerate ischemic cardiac tissue. However, few data exist on the comparative efficacy of these two cell types in semichronic infarcts. METHODS: A myocardial infarction was created by coronary ligation in 32 nude rats. Ten days later, rats received in-scar injections of human SMs, CD133(+) progenitors, or culture medium. Left ventricular function was assessed before and one month after transplantation by echocardiography and pressure-volume loops. Immunofluorescence, polymerase chain reaction, and in situ hybridization were used to detect cells grafted in the hearts. RESULTS: One month after transplantation, left ventricular ejection fraction decreased by 8 +/- 4% in controls, whereas it increased by 7 +/- 3% in CD133(+)-grafted hearts (p = 0.0015 vs. controls) and further by 15 +/- 5% in SM-treated hearts (p = 0.008 vs. controls). Systolic indices yielded by pressure-volume loops paralleled these data. Engrafted myotubes were identified in all SM-treated hearts by immunofluorescence, whereas in CD133(+)-grafted hearts, few human cells were only detected by polymerase chain reaction. CONCLUSIONS: In the setting of postinfarction scars, the transplantation of bone marrow-derived CD133(+) progenitors improves cardiac function, but this benefit is not superior to that afforded by myogenic cells. 相似文献
93.
BACKGROUND/AIMS: Gallbladder abnormalities may be part of the spectrum in primary sclerosing cholangitis (PSC). The aim of the present study was to evaluate the occurrence and prognostic importance of gallbladder abnormalities in patients with PSC. METHODS: Presence of gallbladder abnormalities was assessed in 286 patients with PSC treated at the Liver Unit, Karolinska University Hospital, Huddinge, between 1970 and 2005. RESULTS: One or more gallbladder abnormalities were found in 41% of the patients. Gallstones were found in 25% and cholecystitis in 25%. Cholecystitis among patients with extrahepatic involvement of PSC (30% (65/214)) was significantly higher than among those with intrahepatic involvement (9% (6/70)) (P<0.0001). A gallbladder mass lesion with a mean size of 21 (+/-9) mm (S.D.) was found in 18 (6%) patients, in 56% (10/18) of whom it constituted gallbladder carcinoma. In 9 patients without a gallbladder mass lesion, histological re-evaluation disclosed epithelial dysplasia of the gallbladder. CONCLUSIONS: Gallbladder disease is common in patients with PSC. Dysplasia and carcinoma are commonly found in gallbladder epithelium, suggesting that regular examination of the gallbladder in PSC patients could be of value for early detection of a gallbladder mass lesion. Cholecystectomy is recommended when such a lesion is detected, regardless of its size. 相似文献
94.
Recent developments in neurofibromatoses and RASopathies: Management,diagnosis and current and future therapeutic avenues
下载免费PDF全文
![点击此处可从《American journal of medical genetics. Part A》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Katherine A. Rauen Susan M. Huson Emma Burkitt‐Wright D. Gareth Evans Said Farschtschi Rosalie E. Ferner David H. Gutmann C. Oliver Hanemann Bronwyn Kerr Eric Legius Luis F. Parada Michael Patton Juha Peltonen Nancy Ratner Vincent M. Riccardi Thijs van der Vaart Miikka Vikkula David H. Viskochil Martin Zenker Meena Upadhyaya 《American journal of medical genetics. Part A》2015,167(1):1-10
95.
Ayman El Nakeeb Emad Hamdy Ahmad M Sultan Tarek Salah Waleed Askr Helmy Ezzat Mohamed Said Mostaffa Abu Zeied Tallat Abdallah 《HPB : the official journal of the International Hepato Pancreato Biliary Association》2014,16(8):713-722
Objectives
The optimal strategy for the reconstruction of the pancreas following pancreaticoduodenectomy (PD) is still debated. The aim of this study was to compare the outcomes of isolated Roux loop pancreaticojejunostomy (IRPJ) with those of pancreaticogastrostomy (PG) after PD.Methods
Consecutive patients submitted to PD were randomized to either method of reconstruction. The primary outcome measure was the rate of postoperative pancreatic fistula (POPF). Secondary outcomes included operative time, day to resumption of oral feeding, postoperative morbidity and mortality, and exocrine and endocrine pancreatic functions.Results
Ninety patients treated by PD were included in the study. The median total operative time was significantly longer in the IRPJ group (320 min versus 300 min; P = 0.047). Postoperative pancreatic fistula developed in nine of 45 patients in the IRPJ group and 10 of 45 patients in the PG group (P = 0.796). Seven IRPJ patients and four PG patients had POPF of type B or C (P = 0.710). Time to resumption of oral feeding was shorter in the IRPJ group (P = 0.03). Steatorrhea at 1 year was reported in nine of 42 IRPJ patients and 18 of 41 PG patients (P = 0.029). Albumin levels at 1 year were 3.6 g/dl in the IRPJ group and 3.3 g/dl in the PG group (P = 0.001).Conclusions
Isolated Roux loop PJ was not associated with a lower rate of POPF, but was associated with a decrease in the incidence of postoperative steatorrhea. The technique allowed for early oral feeding and the maintenance of oral feeding even if POPF developed. 相似文献96.
Yemane Berhane Chelsey R. Canavan Anne Marie Darling Christopher R. Sudfeld Said Vuai Richard Adanu Till Brnighausen Yadeta Dessie Justine Nnakate Bukenya David Guwatudde Japhet Killewo Mary M. Sando Ali Sie Ayoade M. J. Oduola Wafaie W. Fawzi 《Tropical medicine & international health : TM & IH》2020,25(1):15-32
97.
98.
Adnan Siti Dalila Mohd Shahrir Mohd Said Syahrul Sazliyana Shaharir Abdul Wahab Asrul Soo Fin Low Azhar Shah Shamsul Rajalingham Sakthiswary 《The Kaohsiung journal of medical sciences》2014,30(7):337-342
The purpose of this study was to compare the serum interleukin (IL)-23 levels between rheumatoid arthritis (RA) patients and healthy controls and to determine the correlation of IL-23 levels with disease activity, joint damage and functional disability in RA. Serum samples were obtained from 45 patients with RA and 45 healthy controls. The enzyme-linked immunosorbent assay method was used for quantitative analysis of IL-23. All the RA patients were assessed for disease activity based on the 28-joint disease activity score, joint damage based on modified Sharp score, and functional ability using the Health Assessment Questionnaire–Disability Index. The mean serum IL-23 level was much higher among the RA patients (24.50 ± 13.98 pg/mL) compared to the controls (5.98 ± 3.40 pg/mL; p < 0.01). There was a significant positive relationship between IL-23 levels and disease activity and questionnaire scores (p = 0.003 and 0.020, respectively). On logistic regression analysis, IL-23 levels were significantly higher in patients with moderate to high disease activity (p = 0.008, odds ratio = 1.073, 95% confidence interval = 1.019–1.130) and patients with significant functional disability (p = 0.008, odds ratio = 1.085, 95% confidence interval = 1.021–1.153). RA patients have significantly higher levels of serum IL-23. The IL-23 levels correlate well with disease activity and functional disability but not with radiographic joint damage. 相似文献
99.
100.
Aziz Homayouni Rad Haniyeh Rasouli Pirouzian Nevzat Konar Omer Said Toker Derya Genc Polat 《RSC advances》2019,9(51):29676
Sucrose-free milk chocolates containing different types of bulk (isomalt, xylitol and maltitol) and high intensity (Stevia) sweeteners were produced by using a ball mill. The main quality characteristics of the formulated chocolates were evaluated and compared with those of the conventional sample containing sucrose. The Casson model was the best fitting model for the rheological data. Casson viscosity and Casson yield stress were significantly affected by the type of bulking agent in chocolates formulated with xylitol (p < 0.05). However xylitol notably improved the overall acceptability according to the sensory analysis results. Chocolates containing the sucrose replacers demonstrated lower Tonset values and higher enthalpy than the control sample. Sucrose-free chocolates illustrated a higher degree of particle agglomeration. Bulk sweeteners meanwhile seem to have high potential for milk chocolate production with low calorie values by using the ball mill technique. Industrial applications: the production of sucrose-free chocolates with conventional methods requires a lot of time and energy. Recently, using alternative methods for chocolate production has been raising interest in many small industries. This study proposed a ball mill method for the preparation of sucrose-free milk chocolates with physiochemical properties almost ranging in the standard limit defined for chocolate. Although using the ball mill method presents a more cost-effective technique for chocolate production and provides shorter processing times for small chocolate industries, it seems to be less efficient in evaporating moisture than the conventional processing. Challenges are still ahead for upgrading this alternative technique to be efficient in evaporating more moisture during operation ending in a high quality product.Sucrose-free milk chocolates containing different types of bulk (isomalt, xylitol and maltitol) and high intensity (Stevia) sweeteners were produced by using a ball mill. 相似文献