全文获取类型
收费全文 | 29373篇 |
免费 | 1402篇 |
国内免费 | 170篇 |
专业分类
耳鼻咽喉 | 319篇 |
儿科学 | 920篇 |
妇产科学 | 577篇 |
基础医学 | 3591篇 |
口腔科学 | 906篇 |
临床医学 | 2072篇 |
内科学 | 7477篇 |
皮肤病学 | 447篇 |
神经病学 | 2703篇 |
特种医学 | 1091篇 |
外科学 | 4706篇 |
综合类 | 104篇 |
一般理论 | 11篇 |
预防医学 | 1713篇 |
眼科学 | 346篇 |
药学 | 1671篇 |
中国医学 | 92篇 |
肿瘤学 | 2199篇 |
出版年
2023年 | 227篇 |
2022年 | 497篇 |
2021年 | 939篇 |
2020年 | 525篇 |
2019年 | 801篇 |
2018年 | 1005篇 |
2017年 | 669篇 |
2016年 | 712篇 |
2015年 | 862篇 |
2014年 | 1145篇 |
2013年 | 1415篇 |
2012年 | 2250篇 |
2011年 | 2215篇 |
2010年 | 1340篇 |
2009年 | 1152篇 |
2008年 | 1893篇 |
2007年 | 1866篇 |
2006年 | 1814篇 |
2005年 | 1672篇 |
2004年 | 1460篇 |
2003年 | 1353篇 |
2002年 | 1300篇 |
2001年 | 391篇 |
2000年 | 364篇 |
1999年 | 323篇 |
1998年 | 230篇 |
1997年 | 208篇 |
1996年 | 188篇 |
1995年 | 175篇 |
1994年 | 140篇 |
1993年 | 132篇 |
1992年 | 143篇 |
1991年 | 131篇 |
1990年 | 140篇 |
1989年 | 115篇 |
1988年 | 112篇 |
1987年 | 94篇 |
1986年 | 98篇 |
1985年 | 77篇 |
1984年 | 86篇 |
1983年 | 61篇 |
1982年 | 65篇 |
1981年 | 44篇 |
1980年 | 53篇 |
1979年 | 46篇 |
1978年 | 45篇 |
1977年 | 34篇 |
1975年 | 29篇 |
1973年 | 33篇 |
1970年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
Enrico Verrina Barbara Andreetta Sergio Bassi Roberto Bonaudo Domenica A. Caringella Alfonso Castellani Pierluigi Cavalli Alberto Edefonti Giancarlo Lavoratti Luigi Longo Ivana Pela Rosa Penza Francesco Perfumo Virgilio Petrucci Marina Picca Mauro Ragaiolo Stefano Rinaldi Gianfranco Rizzoni Palma Sorino Giusto Viglino Graziella Zacchello Rosanna Gusmano 《Pediatric nephrology (Berlin, Germany)》1992,6(1):78-81
The results of the first 3 year' collaboration of the Italian Registry of Paediatric Chronic Peritoneal Dialysis (CPD) (1986–1988) are presented. This Registry acquired data on the majority of the paediatric patients treated with CPD in Italy, thus providing a national picture in a field where few nationwide surveys are available. Patients of less than 15 years of age at the start of dialysis were enrolled and clinical data collected until the age of 19 years. The number of nephrological paediatric centres participating in the Registry increased from 7 in 1986 to 11 in 1988. The total number of patients on CPD was 70 and the percentage of dialysed children treated with CPD ranged from 40.2% to 43.6%. Data on 89 peritoneal catheters were collected: during 1417 dialysis-months 70 catheter-related complications were observed (1:20.8 dialysis-months); actuarial catheter survival was 92.7% at 6 months, 84.8% at 1 year and 68.8% at 2 years. The incidence of peritonitis changed from 1 episode every 10.9 patient-months in 1986 to 1 every 19.8 in 1988. Abdominal hernias were the other main clinical complication observed. The survival of patients was 92.5% at 3 years, while the technique survival at the same time was 84%. 相似文献
52.
53.
54.
55.
56.
57.
58.
Inhibition by N-acetylcysteine of carcinogen-DNA adducts in the tracheal epithelium of rats exposed to cigarette smoke 总被引:1,自引:0,他引:1
Izzotti Alberto; Balansky Roumen; Scatolini Leonardo; Rovida Alessandra; De Flora Silvio 《Carcinogenesis》1995,16(3):669-672
The ability of the aminothiol N-acetylcysteine (NAC) to preventthe formation of carcinogen-DNA adducts in tracheal epithelialcells was investigated in Sprague-Dawley rats exposed whole-bodyto mainstream cigarette smoke for either 40 or 100 consecutivedays. 32P-Postlabelling analyses showed the occurrence of DNAadducts (12.49 adducts/108 nucleotides) after 40 days of exposure,with a trend to formation of characteristic diagonal radioactivezones. Total adduct levels were not further enhanced after 100days of exposure to smoke, although significant changes occurredin the amounts of individual adducts. NAC, given by gavage inthe 40 day study and in drinking water in the 100 day study,significantly inhibited the formation of smoke-related carcinogen-DNAadducts in the tracheal epithelium, to such an extent that adductlevels were not significantly higher than those detected insham-exposed control rats. Together with a variety of othermolecular, clastogenicity, metabolic, cytological and histopathologicalend-points investigated in rodents and with the preliminaryevidence arising from a study in humans, these results documentthe considerable efficacy of oral NAC in inhibiting smoke-relatedcarcinogen-DNA adducts. 相似文献
59.
This study demonstrates that regeneration of unmyelinated sudomotor axons in mice becomes progressively slower during aging. Identical lesions were made in mice aged 0, 2, 4, 6, 7, 24 and 60 weeks. The peroneal, sural and saphenous nerves were cut and tied to prevent regeneration. The sciatic nerve was then frozen at the thigh, leaving the hind paw completely denervated. By 7 days, sweat glands (SGs) of the paw had ceased sweating after pilocarpine injection. Subsequent regeneration of sudomotor axons was judged by the rate of return of pilocarpine sensitivity. SGs in the hind paws of normal newborn mice did not sweat at birth. Cholinergic stimulation first activated sweating at 13 days of life. The number of responsive SGs increased progressively to reach the adult level by 30 days. In one-week-old mice, whose sciatic nerve had been sectioned, the SG response to cholinergic stimulation was very delayed in time and reduced in number. Sweat glands of young mice, between 2 and 4 weeks of age, regained cholinergic sensitivity at a faster rate than mature animals and attained normal SG counts. Throughout a broad intermediate range of age in adulthood (7-24 weeks), the rate of sudomotor nerve regeneration was the same, but in older mice (60 weeks) it was slower and less complete. 相似文献
60.
J S Valencia Sánchez J Navarro Robles J Villalpando Gutiérrez 《Archivos del Instituto de Cardiología de México》1988,58(6):551-556
We studied four patients with ruptured aneurysms of the sinus of Valsalva. All were men with a mean age of 33 years. The presenting illness was insidious in three and of abrupt onset in one. Physical examination showed a continuous murmur in all. Chest X ray film showed moderate cardiomegaly. Electrocardiogram disclosed left ventricular hypertrophy. Echocardiogram revealed the site of the rupture which was corroborated by aortography. Two aneurysms ruptured to the right ventricle and two to the right atrium. All were corrected by surgery. All patients became asymptomatic. 相似文献