全文获取类型
收费全文 | 5544篇 |
免费 | 306篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 71篇 |
儿科学 | 138篇 |
妇产科学 | 162篇 |
基础医学 | 702篇 |
口腔科学 | 146篇 |
临床医学 | 375篇 |
内科学 | 1443篇 |
皮肤病学 | 110篇 |
神经病学 | 514篇 |
特种医学 | 142篇 |
外科学 | 920篇 |
综合类 | 31篇 |
预防医学 | 321篇 |
眼科学 | 82篇 |
药学 | 235篇 |
中国医学 | 15篇 |
肿瘤学 | 481篇 |
出版年
2023年 | 53篇 |
2022年 | 114篇 |
2021年 | 285篇 |
2020年 | 120篇 |
2019年 | 217篇 |
2018年 | 229篇 |
2017年 | 165篇 |
2016年 | 140篇 |
2015年 | 143篇 |
2014年 | 226篇 |
2013年 | 291篇 |
2012年 | 460篇 |
2011年 | 521篇 |
2010年 | 263篇 |
2009年 | 240篇 |
2008年 | 358篇 |
2007年 | 363篇 |
2006年 | 345篇 |
2005年 | 329篇 |
2004年 | 256篇 |
2003年 | 239篇 |
2002年 | 209篇 |
2001年 | 28篇 |
2000年 | 28篇 |
1999年 | 40篇 |
1998年 | 42篇 |
1997年 | 28篇 |
1996年 | 15篇 |
1995年 | 20篇 |
1994年 | 14篇 |
1993年 | 18篇 |
1992年 | 13篇 |
1991年 | 11篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1981年 | 9篇 |
1980年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1974年 | 2篇 |
1947年 | 1篇 |
1944年 | 1篇 |
1942年 | 1篇 |
1936年 | 1篇 |
1920年 | 1篇 |
排序方式: 共有5888条查询结果,搜索用时 15 毫秒
1.
2.
3.
Tormo Nuria Giménez Estela Martínez-Navarro María Albert Eliseo Navalpotro David Torres Ignacio Gimeno Concepción Navarro David 《European journal of clinical microbiology & infectious diseases》2022,41(4):657-662
European Journal of Clinical Microbiology & Infectious Diseases - We compared the performance of an in-house-developed flow cytometry assay for intracellular cytokine staining (FC-ICS) and a... 相似文献
4.
5.
Ignacio Lopez Escolastico Aguilera-Tejero Arnold J Felsenfeld Jose Carlos Estepa Mariano Rodriguez 《Journal of bone and mineral research》2002,17(9):1691-1700
Because both metabolic (Met Acid) and respiratory acidosis (Resp Acid) have diverse effects on mineral metabolism, it has been difficult to establish whether acidosis directly affects parathyroid hormone (PTH) secretion. Our goal was to determine whether acute Met Acid and Resp Acid directly affected PTH secretion. Three groups of dogs were studied: control, acute Met Acid induced by HCl infusion, and acute Resp Acid induced by hypoventilation. EDTA was infused to prevent acidosis-induced increases in ionized calcium, but more EDTA was needed in Met Acid than in Resp Acid. The PTH response to EDTA-induced hypocalcemia was evaluated also. Magnesium needed to be infused in groups receiving EDTA to prevent hypomagnesemia. The half-life of intact PTH (iPTH) was determined during hypocalcemia when PTH was measured after parathyroidectomy. During normocalcemia, PTH values were greater (p < 0.05) in Met Acid (92 +/- 19 pg/ml) and Resp Acid (77 +/- 22 pg/ml) than in controls (27 +/- 5 pg/ml); the respective pH values were 7.23 +/- 0.01, 7.24 +/- 0.01, and 7.39 +/- 0.02. The maximal PTH response to hypocalcemia was greater (p < 0.05) in Met Acid (443 +/- 54 pg/ml) than in Resp Acid (267 +/- 37 pg/ml) and controls (262 +/- 48 pg/ml). The half-life of PTH was greater (p < 0.05) in Met Acid than in controls, but the PTH secretion rate also was greater (p < 0.05) in Met Acid than in the other two groups. In conclusion, (1) both acute Met Acid and Resp Acid increase PTH secretion when the ionized calcium concentration is normal; (2) acute Met Acid may increase the bone efflux of calcium more than Resp Acid; (3) acute Met Acid acts as a secretogogue for PTH secretion because it enhances the maximal PTH response to hypocalcemia. 相似文献
6.
7.
8.
9.
José Ignacio Bilbao Mercedes Arias Jesús María Longo Pedro Luis Alejandre María Teresa Betés Arlette María Elizalde 《Cardiovascular and interventional radiology》1997,20(2):149-153
Percutaneous embolization of large portosystemic collaterals was performed in three patients following placement of a transjugular
intrahepatic portosystemic shunt in order to improve hepatopetal portal flow. Improved hepatic portal perfusion was achieved
in these cases, thereby theoretically reducing the risk of chronic hepatic encephalopathy. 相似文献
10.
Ignacio Alvarez Alvarez M.D. Pedro Sanchez Lazo Ph.D. Sofia Ramos Gonzalez Ph.D. J. Pablo Rodrigo Tapia M.D. Faustino Nunez Batalla M.D. Carlos Suarez Nieto M.D. 《American journal of otolaryngology》1997,18(6):375
Purpose: Increasingly, evidence has shown that human papillomavirus (HPV) plays a role in the induction of certain carcinomas. The presence of HPV sequences in 56 previously untreated oral and pharyngolaryngeal carcinomas was examined by the polymerase chain reaction (PCR).Materials and Methods: After DNA extraction, samples underwent 40 replication cycles with specific oligonucleotide primers corresponding to sequences from the E6 open-reading frame of HPV-6b, HPV-16, and HPV-18. To determine the E6 genomic integration, positive samples were processed with specific primers for the corresponding HPV L1 genes. Genomic HPV DNA cloned into PBR 322 was used as positive control.Results: HPV E6 DNA of the 6b and 16 types was detected in 14 patients (25%). The L1 gene was not present.Conclusion: Detected HPV E6 DNA might be integrated into the cell genome in the positive cases as indicated by the absence of the L1 gene-coding for the viral capside. Histological and clinical parameters, such as tumor location, degree of differentiation, stage, recurrence, and survival rates, were unrelated to the presence of HPV. 相似文献