全文获取类型
收费全文 | 16332篇 |
免费 | 1129篇 |
国内免费 | 72篇 |
专业分类
耳鼻咽喉 | 76篇 |
儿科学 | 350篇 |
妇产科学 | 530篇 |
基础医学 | 2762篇 |
口腔科学 | 189篇 |
临床医学 | 1608篇 |
内科学 | 3877篇 |
皮肤病学 | 138篇 |
神经病学 | 1460篇 |
特种医学 | 548篇 |
外国民族医学 | 1篇 |
外科学 | 2572篇 |
综合类 | 143篇 |
一般理论 | 7篇 |
预防医学 | 951篇 |
眼科学 | 136篇 |
药学 | 1003篇 |
中国医学 | 21篇 |
肿瘤学 | 1161篇 |
出版年
2023年 | 45篇 |
2022年 | 75篇 |
2021年 | 223篇 |
2020年 | 133篇 |
2019年 | 256篇 |
2018年 | 328篇 |
2017年 | 205篇 |
2016年 | 264篇 |
2015年 | 355篇 |
2014年 | 472篇 |
2013年 | 682篇 |
2012年 | 1001篇 |
2011年 | 1123篇 |
2010年 | 713篇 |
2009年 | 691篇 |
2008年 | 1123篇 |
2007年 | 1136篇 |
2006年 | 1124篇 |
2005年 | 1188篇 |
2004年 | 1081篇 |
2003年 | 1058篇 |
2002年 | 1064篇 |
2001年 | 170篇 |
2000年 | 146篇 |
1999年 | 179篇 |
1998年 | 257篇 |
1997年 | 236篇 |
1996年 | 187篇 |
1995年 | 193篇 |
1994年 | 167篇 |
1993年 | 165篇 |
1992年 | 143篇 |
1991年 | 105篇 |
1990年 | 89篇 |
1989年 | 84篇 |
1988年 | 80篇 |
1987年 | 64篇 |
1986年 | 71篇 |
1985年 | 51篇 |
1984年 | 70篇 |
1983年 | 56篇 |
1982年 | 71篇 |
1981年 | 87篇 |
1980年 | 45篇 |
1979年 | 43篇 |
1978年 | 42篇 |
1977年 | 28篇 |
1976年 | 30篇 |
1975年 | 31篇 |
1973年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
991.
992.
993.
994.
Event related potentials (ERPs) were recorded from subjects who had to perform either an identification task or a simple detection task on moving visual stimuli. Results showed that the amplitude of the so-called visual "N1" component was larger for identification than for mere detection, replicating previous data obtained with static stimuli. However, we also found that: (i) the onset, peak and offset latencies of the visual N1 to dynamic stimuli were significantly earlier in the detection task than in the identification task, and (ii) in both conditions, the coordinates of the equivalent current dipoles best explaining the visual N1 component were consistent with those of the human motion visual area MT+/V5 in the extrastriate cortex. Altogether, these results indicate that dynamic stimuli may activate (at least partly) different pathways and processes in extrastriate cortex according to the nature of the task required on these stimuli. 相似文献
995.
Clarke AJ Jacques TS Galloway MJ Thom M Kitchen ND Plant GT 《Journal of clinical pathology》2005,58(9):981-983
Inflammatory myofibroblastic tumours (IMTs) are an uncommon spindle cell neoplasm with a dense inflammatory infiltrate, usually encountered in children. IMTs of the central nervous system are extremely rare. This report describes the case of an IMT in a 61 year old man, in the pineal region. The tumour was completely excised, and immunohistochemistry demonstrated anaplastic lymphoma kinase 1 expression. There was no tumour recurrence during 18 months of follow-up. Our case extends both the age range and sites of occurrence of this rare tumour. 相似文献
996.
997.
998.
999.
Benjamin Thysen Giuseppe Rettura Jacques Padawer Michael Gatz Stanley M. Levenson Eli Seifter 《Cancer chemotherapy and pharmacology》1982,8(1):23-26
Summary The influence of progesterone and estradiol labeled with tritium was studied in mice inoculated with transplantable mammary adenocarcinomas C3HBA or BW 10232. Tumor size, tumor growth rate, and host survival were measured. Radioactive [3H]estradiol administration increased survival time and inhibited tumor growth in mice inoculated with these tumor lines. Tumor growth retardation depended on the amount of radioactivity injected and nonradioactive estradiol was without any salutary effect on tumor size or host survival. Neither survival times nor tumor growth rate were altered by radioactive [3H]progesterone. The underlying mechanism(s) is (are) referable to ionizing radiation by the specific carrier estradiol or to an isotope effect of [3H]estradiol. 相似文献
1000.
Five patients with acontractile bladders were observed during lateral voiding cystourethrography in the resting and straining states. Two abnormalities were noted: (I) posterior displacement of the bladder with closure of the posterior vesicourethral angle on straining, and (2) plication of the bladder over the symphysis pubis, resulting in the formation of an anterior pseudodiverticulum. Two other abnormalities are discussed: closure of the anterior vesicourethral angle, and descent of the bladder and prostate in flaccid paraplegia, causing plication at the prostatic apex. Surgical techniques for the correction of the abnormalities are described. 相似文献