全文获取类型
收费全文 | 4805篇 |
免费 | 313篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 38篇 |
儿科学 | 136篇 |
妇产科学 | 96篇 |
基础医学 | 686篇 |
口腔科学 | 190篇 |
临床医学 | 411篇 |
内科学 | 990篇 |
皮肤病学 | 109篇 |
神经病学 | 272篇 |
特种医学 | 112篇 |
外国民族医学 | 1篇 |
外科学 | 436篇 |
综合类 | 122篇 |
一般理论 | 1篇 |
预防医学 | 553篇 |
眼科学 | 80篇 |
药学 | 504篇 |
中国医学 | 87篇 |
肿瘤学 | 329篇 |
出版年
2024年 | 12篇 |
2023年 | 74篇 |
2022年 | 235篇 |
2021年 | 350篇 |
2020年 | 213篇 |
2019年 | 174篇 |
2018年 | 220篇 |
2017年 | 148篇 |
2016年 | 180篇 |
2015年 | 189篇 |
2014年 | 223篇 |
2013年 | 277篇 |
2012年 | 384篇 |
2011年 | 396篇 |
2010年 | 191篇 |
2009年 | 125篇 |
2008年 | 212篇 |
2007年 | 186篇 |
2006年 | 208篇 |
2005年 | 154篇 |
2004年 | 139篇 |
2003年 | 136篇 |
2002年 | 105篇 |
2001年 | 36篇 |
2000年 | 50篇 |
1999年 | 50篇 |
1998年 | 28篇 |
1997年 | 23篇 |
1996年 | 26篇 |
1995年 | 23篇 |
1994年 | 13篇 |
1993年 | 19篇 |
1992年 | 41篇 |
1991年 | 29篇 |
1990年 | 37篇 |
1989年 | 29篇 |
1988年 | 25篇 |
1987年 | 21篇 |
1986年 | 23篇 |
1985年 | 18篇 |
1984年 | 16篇 |
1983年 | 14篇 |
1982年 | 6篇 |
1979年 | 13篇 |
1978年 | 6篇 |
1977年 | 10篇 |
1976年 | 6篇 |
1975年 | 9篇 |
1974年 | 7篇 |
1971年 | 11篇 |
排序方式: 共有5153条查询结果,搜索用时 15 毫秒
41.
Nur Najihah Izzati Mat Rani Xiang Yi Chen Zahraa M.Al-Zubaidi Hanisah Azhari Tzar Mohd Nizam Khaitir Pei Yuen Ng Fhataheya Buang Geok Chin Tan Yin Ping Wong Mazlina Mohd Said Adeel Masood Butt Azmy A.Hamid Mohd Cairul Iqbal Mohd Amin 《Asian Journal of Pharmaceutical Sciences》2022,17(1):102-119
This study focused on the encapsulation of vancomycin(VAN) into liposomes coated with a red blood cell membrane with a targeting ligand, daptomycin–polyethylene glycol–1,2-distearoyl-sn-glycero-3-phosphoethanolamine, formed by conjugation of DAPT and Nhydroxysuccinimidyl-polyethylene glycol-1,2-distearoyl-sn-glycero-3-phosphoethanolamine.This formulation is capable of providing controlled and targeted drug delivery to the bacterial cytoplasm. We performed MALDI-TOF, NMR and FTIR analyses to conf... 相似文献
42.
43.
Vascular endothelial growth factor (VEGF) is a potent angiogenesis mediator. Scant reports are available defining the role of VEGF in active and inactive tubercular meningitis (TBM) with no studies on brain tuberculoma. We quantified VEGF levels by enzyme linked immunoassay (ELISA) in cerebrospinal fluid (CSF) and serum in 20 cases each with active and inactive TBM as well as 22 cases of intraparenchymal tuberculoma. VEGF expression and microvessel angiogenesis quantification was done in 7 cases where tuberculomas were excised. Significantly increased VEGF levels in CSF were found in active TBM cases (106.0+/-50.0 pg/ml) compared to inactive TBM cases (14.7+/-10.0 pg/ml) (p<0.001). Mean serum VEGF levels in active TBM, inactive TBM and tuberculoma were 694.93+/-820.66 pg/ml, 499.61+/-238.33 pg/ml and 541.0+/-389.0 pg/ml, respectively. Immunohistochemical staining of excised tuberculoma demonstrated high expression of VEGF in granulomatous areas with intense positivity in inflammatory mononuclear cells, Langhan's giant cells as well as reactive astrocytes and fibrocytes. A strong positive correlation was observed between microvessel density and VEGF expression. Serial decrease in serum VEGF levels was observed with increasing duration of therapy in tuberculoma. We conclude that increased CSF and serum VEGF levels are a measure of activity of the disease in neurotuberculosis and its gradual decrease over a period of time is probably an indicator of therapeutic response. 相似文献
44.
Kunio Okuda Toshiro Nakashima Masahiko Okudaira Masayoshi Kage Yoshibumi Aida Masao Omata Hirotaka Musha Shunji Futagawa Mitsuo Sugiura Haruo Kameda 《Liver international》1981,1(4):255-263
ABSTRACT— Hepatic venograms made in 40 authentic cases of idiopathic portal hypertension (Banti's syndrome) were compared with 13 normal venograms and venograms obtained in 88 cases of cirrhosis, and analyzed in the light of the pathological changes seen in 16 postmortem liver specimens. There were frequent anastomoses between hepatic vein radicles, approximation of middle-size branches to the liver surface, reduction in the angles between the main hepatic vein and its tributaries, and difficulty in opacifying portal vein branches in wedged retrograde portography. These angiographic alterations were corroborated by gross pathological findings which comprised displacement of middle-size hepatic vein branches closer to the liver surface and their approximation among themselves, and seem to be accounted for by the disappearance of liver parenchyma secondary to the peripheral portal circulatory failure. 相似文献
45.
Yamagishi H Koike T Ohara S Kobayashi S Ariizumi K Abe Y Iijima K Imatani A Inomata Y Kato K Shibuya D Aida S Shimosegawa T 《World journal of gastroenterology : WJG》2008,14(9):1358-1364
AIM:To examine the prevalence of gastroesophageal reflux disease (GERD) symptoms in a large unselected general population in Japan.
METHODS: In Japan, mature adults are offered regular check-ups for the prevention of gastric cancer. A notice was sent by mail to all inhabitants aged 〉 40 years. A total of 160 983 Japanese (60 774 male, 100 209 female; mean age 61.9 years) who underwent a stomach check up were enrolled in this study. In addition, from these 160 983 subjects, we randomly selected a total of 82 894 (34 275 male, 48 619 female; mean age 62.4 years) to evaluate the prevalence of abdominal pain. The respective subjects were prospectively asked to complete questionnaires concerning the symptoms of heartburn, dysphagia, and abdominal pain for a 1 mo period.
RESULTS: The respective prevalences of the symptoms in males and females were: heartburn, 15.8% vs 20.7%; dysphagia, 5.4% vs 7.8%; and abdominal pain, 6.6% vs 9.6%. Among these symptoms, heartburn was significantly high compared with the other symptoms, and the prevalence of heartburn was significantly more frequent in females than in males in the 60-89-year agegroup. Dysphagia was also significantly more frequent in female patients.
CONCLUSION: The prevalence of typical GERD symptoms (heartburn) was high, at about 20% of the Japan population, and the frequency was especially high in females in the 60-89 year age group. 相似文献
METHODS: In Japan, mature adults are offered regular check-ups for the prevention of gastric cancer. A notice was sent by mail to all inhabitants aged 〉 40 years. A total of 160 983 Japanese (60 774 male, 100 209 female; mean age 61.9 years) who underwent a stomach check up were enrolled in this study. In addition, from these 160 983 subjects, we randomly selected a total of 82 894 (34 275 male, 48 619 female; mean age 62.4 years) to evaluate the prevalence of abdominal pain. The respective subjects were prospectively asked to complete questionnaires concerning the symptoms of heartburn, dysphagia, and abdominal pain for a 1 mo period.
RESULTS: The respective prevalences of the symptoms in males and females were: heartburn, 15.8% vs 20.7%; dysphagia, 5.4% vs 7.8%; and abdominal pain, 6.6% vs 9.6%. Among these symptoms, heartburn was significantly high compared with the other symptoms, and the prevalence of heartburn was significantly more frequent in females than in males in the 60-89-year agegroup. Dysphagia was also significantly more frequent in female patients.
CONCLUSION: The prevalence of typical GERD symptoms (heartburn) was high, at about 20% of the Japan population, and the frequency was especially high in females in the 60-89 year age group. 相似文献
46.
47.
48.
49.
50.
Abdul Ahad Fahad I. Al-Jenoobi Abdullah M. Al-Mohizea Naseem Akhtar Mohammad Raish Mohd. Aqil 《Saudi Pharmaceutical Journal》2015,23(6):587-602
Hypertension is the most common cardiovascular disease worldwide. Moreover, management of hypertension requires long-term treatment that may result in poor patient compliance with conventional dosage forms due to greater frequency of drug administration. Although there is availability of a plethora of therapeutically effective antihypertensive molecules, inadequate patient welfare is observed; this arguably presents an opportunity to deliver antihypertensive agents through a different route. Ever since the transdermal drug delivery came into existence, it has offered great advantages including non-invasiveness, prolonged therapeutic effect, reduced side effects, improved bioavailability, better patient compliance and easy termination of drug therapy. Attempts were made to develop the transdermal therapeutic system for various antihypertensive agents, including β-blockers, an important antihypertensive class. β-blockers are potent, highly effective in the management of hypertension and other heart ailments by blocking the effects of normal amounts of adrenaline in the heart and blood vessels. The shortcomings associated with β-blockers such as more frequent dose administration, extensive first pass metabolism and variable bioavailability, make them an ideal candidate for transdermal therapeutic systems. The present article gives a brief view of different β-blockers formulated as transdermal therapeutic system in detail to enhance the bioavailability as well as to improve patient compliance. Constant improvement in this field holds promise for the long-term success in technologically advanced transdermal dosage forms being commercialized sooner rather than later. 相似文献