全文获取类型
收费全文 | 5771篇 |
免费 | 616篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 65篇 |
儿科学 | 196篇 |
妇产科学 | 110篇 |
基础医学 | 626篇 |
口腔科学 | 62篇 |
临床医学 | 750篇 |
内科学 | 1003篇 |
皮肤病学 | 130篇 |
神经病学 | 610篇 |
特种医学 | 189篇 |
外科学 | 548篇 |
综合类 | 49篇 |
一般理论 | 6篇 |
预防医学 | 709篇 |
眼科学 | 43篇 |
药学 | 345篇 |
中国医学 | 3篇 |
肿瘤学 | 949篇 |
出版年
2023年 | 44篇 |
2022年 | 65篇 |
2021年 | 167篇 |
2020年 | 105篇 |
2019年 | 158篇 |
2018年 | 211篇 |
2017年 | 183篇 |
2016年 | 180篇 |
2015年 | 204篇 |
2014年 | 283篇 |
2013年 | 359篇 |
2012年 | 525篇 |
2011年 | 554篇 |
2010年 | 265篇 |
2009年 | 249篇 |
2008年 | 354篇 |
2007年 | 366篇 |
2006年 | 340篇 |
2005年 | 296篇 |
2004年 | 300篇 |
2003年 | 229篇 |
2002年 | 197篇 |
2001年 | 57篇 |
2000年 | 52篇 |
1999年 | 52篇 |
1998年 | 38篇 |
1997年 | 35篇 |
1996年 | 23篇 |
1995年 | 30篇 |
1994年 | 15篇 |
1993年 | 22篇 |
1992年 | 32篇 |
1991年 | 33篇 |
1990年 | 34篇 |
1989年 | 32篇 |
1988年 | 28篇 |
1987年 | 36篇 |
1986年 | 21篇 |
1985年 | 26篇 |
1984年 | 25篇 |
1983年 | 21篇 |
1982年 | 13篇 |
1980年 | 15篇 |
1979年 | 11篇 |
1978年 | 14篇 |
1977年 | 12篇 |
1976年 | 8篇 |
1974年 | 9篇 |
1973年 | 8篇 |
1971年 | 8篇 |
排序方式: 共有6393条查询结果,搜索用时 15 毫秒
1.
2.
3.
A D Deitch V A Andreotti M A Strand L Howell R W deVere White 《The Journal of urology》1990,143(4):700-705
We describe a method to fix exfoliated bladder cells that is suitable for followup of bladder cancer patients by deoxyribonucleic acid flow cytometry. After fixation with room temperature methanol plus acetic acid (20:1, volume:volume) urine and bladder washing samples from these patients can be stored at room temperature for 3 to 7 days and then assessed reliably for the presence of aneuploidy and the percentage of hyperdiploid cells. For those with active transitional cell carcinoma diagnostic accuracy comparing fresh to fixed specimens was improved from 58 to 92% with urine and from 50 to 100% with washing samples. For patients with a history of transitional cell carcinoma who currently are free of disease the false positive rate remains unchanged after fixation. The procedure described is suitable for use in the outpatient clinic and should permit shipping of samples without refrigeration to a central flow cytometry facility for analysis. 相似文献
4.
Extrarenal Wilms tumor occurring in the inguinal canal 总被引:2,自引:0,他引:2
We report an unusual case of extrarenal Wilms tumor discovered incidentally during routine inguinal orchiopexy. The world literature and embryological implications of Wilms tumor in the inguinal canal are reviewed. 相似文献
5.
6.
7.
Sven-Erik Strand Margareta Strandh Per Spanne 《Acta oncologica (Stockholm, Sweden)》1993,32(7):787-791
The need for direct methods of measuring the absorbed dose in vivo increases for systemic radiation therapy, and in more sophisticated methodologies developed for radioimmunotherapy. One method suggested is the use of mini-thermoluminescent dosimeters (TLD). Recent reports indicate a marked loss of signal when the dosimeters are used in vivo. We investigated the exterior surface of the dosimeters with scanning electron microscopy and the interior dosimeter volume with computed microtomography. The results show that the dosimeters initially have crystals uniformly embedded in the teflon matrix, with some of them directly exposed to the environment. After incubation in gel, holes appear in the dosimeter matrix where the crystals should have been. The computed microtomographic images show that crystals remain in the interior of the matrix, producing the remaining signal. We conclude that these dosimeters should be very carefully handled, and for practical use of mini-TLDs in vivo the dosimeters should be calibrated in equivalent milieus. An alternative solution to the problem of decreased TL efficiency, would be to coat the dosimeters with a thin layer, of Teflon, or other suitable material. 相似文献
8.
9.
10.