全文获取类型
收费全文 | 1423篇 |
免费 | 90篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 76篇 |
妇产科学 | 50篇 |
基础医学 | 211篇 |
口腔科学 | 63篇 |
临床医学 | 111篇 |
内科学 | 275篇 |
皮肤病学 | 86篇 |
神经病学 | 117篇 |
特种医学 | 31篇 |
外科学 | 138篇 |
综合类 | 23篇 |
一般理论 | 2篇 |
预防医学 | 183篇 |
眼科学 | 9篇 |
药学 | 63篇 |
肿瘤学 | 74篇 |
出版年
2024年 | 3篇 |
2023年 | 19篇 |
2022年 | 20篇 |
2021年 | 53篇 |
2020年 | 27篇 |
2019年 | 41篇 |
2018年 | 47篇 |
2017年 | 38篇 |
2016年 | 44篇 |
2015年 | 41篇 |
2014年 | 56篇 |
2013年 | 67篇 |
2012年 | 99篇 |
2011年 | 117篇 |
2010年 | 67篇 |
2009年 | 64篇 |
2008年 | 92篇 |
2007年 | 122篇 |
2006年 | 87篇 |
2005年 | 78篇 |
2004年 | 96篇 |
2003年 | 64篇 |
2002年 | 65篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 8篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1989年 | 4篇 |
1987年 | 4篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1961年 | 3篇 |
1960年 | 5篇 |
1959年 | 2篇 |
1958年 | 3篇 |
1957年 | 2篇 |
1927年 | 4篇 |
1926年 | 3篇 |
1921年 | 1篇 |
排序方式: 共有1523条查询结果,搜索用时 125 毫秒
71.
Hmed Ben Nasr Hammami Serria Selma Chaker Badraoui Riadh Sahnoun Zouheir Jamoussi Kamel Rebai Tarek Zeghal Khaled 《Experimental and toxicologic pathology》2009,61(6):573-580
Scorpion envenoming is less studied during gestation; however, it may induce various biological disturbances in maternal organism and hypothetical ones on their fetuses. The scope of this report was to elucidate some biological effects of such poisoning in late pregnant rats. Hence, TBARS levels in maternal lung, placental and fetal pulmonary and hepatic tissues and dam's biochemical blood parameters (glucose, creatinine, 17-β estradiol, progesterone, blood nitrogen urea, sodium and potassium maternal plasma concentrations) had been evaluated after saline (G1), and scorpion venom (G2: 30 min and G3: 60 min) injections in 22nd day pregnant rats. Histological microscopic examination of these tissues was also carried out in HE-stained paraffin sections. In addition, the mean arterial blood pressure following the envenomation variations was measured in three rats from the same pool. Our results showed that Buthus occitanus tunetanus crude venom induced significant increase in maternal, placental and fetal tissues lipid peroxidation, concomitant with blood pressure elevation. Maternal plasma creatinine, estradiol and progesterone concentrations levelled up significantly after 30 min or later (60 min) after the venom injection. Except for a probable pronounced oedema and few congestions in maternal lungs and degenerative aspects of trophoblast cells, all examined tissues showed a conserved structure. These results suggest that scorpion envenomation may induce gestation process disturbances and threatens both mother's and fetus’ well-being. 相似文献
72.
73.
Metintas Selma Ak Guntulu Dundar Emine Metintas Muzaffer 《International journal of clinical oncology / Japan Society of Clinical Oncology》2022,27(7):1202-1211
International Journal of Clinical Oncology - To investigate the changes in epidemiological and survival characteristics of malignant mesothelioma (MM) cases diagnosed in a 30-year period between... 相似文献
74.
Houyem Ouragini Faïka Cherif Sabrine Ahlem Ben Brick Sonia Nouira Giovanna Floriddia Monica Pascucci Rym Kefi Wafa Daoud Nabiha Mahdhaoui Selma Kassar Ridha Mrad Mohammed Ridha Kamoun Amel Ben Osman-Dhahri Mohamed Denguezli Kamel Monastiri Hassen Seboui Mourad Mokni Samir Boubaker Daniele Castiglia Sonia Abdelhak 《Journal of dermatological science》2010,57(2):144-146
75.
In this study, fibronectin and sialic acid levels were determined in human pituitary adenomas. The mean fibronectin and sialic acid levels for human pituitary adenomas were found to be 31.64 ± 15.82 μg/mg protein and 21.90 ± 9.82 μg/mg protein, respectively, versus 6.30 ± 2.96 μg/mg protein and 9.88 ± 2.81 μg/mg protein for the normal brain tissues. Fibronectin and sialic acid levels were significantly higher (P < 0.001) in human pituitary adenomas than the normal brain tissues. In human infiltrative and non-infiltrative pituitary adenomas, the mean fibronectin and sialic acid levels were found to be 40.87 ± 15.90 μg/mg protein, 27.59 ± 11.10 μg/mg protein and 22.40 ± 9.51 μg/mg protein, 16.21 ± 3.20 μg/mg protein, respectively. Fibronectin and sialic acid levels were slightly elevated (P < 0.05) in human infiltrative pituitary adenomas compared with non-infiltrative adenomas. 相似文献
76.
77.
Fraiberg S 《Praxis der Kinderpsychologie und Kinderpsychiatrie》2003,52(8):560-577
A group of pathological defenses has been observed in infants between three and eighteen months of age who have experienced danger and deprivation to an extreme degree. The early defenses, "avoidance", "freezing", and "fighting", are apparently summoned from a biological repertoire on the model of "flight or fight". Before there ist an ego, pain ca bei transformed into pleasure of obliterated from consciousness while a symptom stands in place of the original conflict. 相似文献
78.
Kraiem S Chehaibi N Bouladi W Longo S Mghaieth F Bouraoui L Slimane ML 《La Tunisie médicale》2002,80(12):801-806
The aim of this study is to evaluate new echocardiographic modes in diagnosis of arrhythmogenic right ventricular dysplasia (ARVD). Our study is prospective, including ten patients with ARVD and a control group of ten healthy subjects. Transthoracic echocardiography included evaluation of classical criteria's, cross sectional measurements of the right ventricular. M mode and pulsed tissue Doppler techniques were used for quantitative measurement of tricuspid annular motion at the lateral and septal positions. Assessed by M mode, the total amplitude of the tricuspid annular motion was decreased in the lateral and septal positions in the patients compared with the controls. The tissue Doppler velocity pattern showed decreased early diastolic peak annular (Ea) velocity and an accompanying decrease in early (Ea) to late diastolic(Aa) velocity ratio in all positions; the systolic annular velocity was decreased only in the lateral position. Tricuspid annular measurement are valuable, easy to obtain and allow quantitative assessment of right ventricular function. ARVC patients showed an abnormal velocity pattern that may be an early but non specific sign of disease. 相似文献
79.
80.
Nascimento RS Valente SR Oliveira LC 《Revista do Instituto de Medicina Tropical de S?o Paulo》2002,44(5):251-254
As patients with chronic Chagas disease exhibit morphological and functional changes of the stomach (hypomotility and hypochlorhydria), malnutrition, immunological deficiency and high prevalence of peptic disease associated to Helicobacter pylori infection, the purpose of this study was to evaluate if the prevalence of H. pylori infection in chronic chagasic is higher than in non-chagasic individuals in the urban and rural population from Uberlandia, MG, Brazil. Serological determination of IgG antibodies to H. pylori was performed using a second-generation ELISA. Thus, 598 people were evaluated: 128 chagasic (CG), 222 non-chagasic living in urban area (U-NCG) and 248 non-chagasic living in rural area (R-NCG). Regarding the age range from 21 to 50 years, the prevalence of H. pylori infection in the CG (85.1%) was significantly higher than in the U-NCG (56.3%, p < 0.01) and the R-NCG (67.4%, p < 0.05). In the patients over 50 years, the prevalence in the CG (86.4%) was similar to the U-NCG (78.8%) and R-NCG (86.1%). Similar results were also found between the U-NCG and R-NCG for all age ranges, with prevalence rates of 29.1% and 35.3% for the age range from 5 to 13 years, and 47.2% and 40% for that from 14 to 20 years, respectively. We conclude that chagasic patients showed a higher seroprevalence of H. pylori infection than non-chagasic individuals, in the age range from 21 to 50 years, and that the prevalence of this infection was similar in the studied urban and rural non-chagasic population. 相似文献