全文获取类型
收费全文 | 142127篇 |
免费 | 7236篇 |
国内免费 | 153篇 |
专业分类
耳鼻咽喉 | 2270篇 |
儿科学 | 4791篇 |
妇产科学 | 3300篇 |
基础医学 | 21176篇 |
口腔科学 | 4600篇 |
临床医学 | 12315篇 |
内科学 | 25894篇 |
皮肤病学 | 3980篇 |
神经病学 | 14546篇 |
特种医学 | 5996篇 |
外科学 | 21587篇 |
综合类 | 645篇 |
一般理论 | 41篇 |
预防医学 | 8042篇 |
眼科学 | 3059篇 |
药学 | 9693篇 |
中国医学 | 202篇 |
肿瘤学 | 7379篇 |
出版年
2023年 | 829篇 |
2022年 | 559篇 |
2021年 | 1370篇 |
2020年 | 1270篇 |
2019年 | 1528篇 |
2018年 | 3074篇 |
2017年 | 2605篇 |
2016年 | 3371篇 |
2015年 | 2917篇 |
2014年 | 3302篇 |
2013年 | 5739篇 |
2012年 | 7288篇 |
2011年 | 8176篇 |
2010年 | 4804篇 |
2009年 | 3461篇 |
2008年 | 8282篇 |
2007年 | 8725篇 |
2006年 | 8437篇 |
2005年 | 8317篇 |
2004年 | 7816篇 |
2003年 | 7817篇 |
2002年 | 7728篇 |
2001年 | 5299篇 |
2000年 | 6744篇 |
1999年 | 3757篇 |
1998年 | 1564篇 |
1997年 | 1283篇 |
1996年 | 1000篇 |
1995年 | 810篇 |
1994年 | 828篇 |
1993年 | 786篇 |
1992年 | 745篇 |
1991年 | 634篇 |
1990年 | 593篇 |
1989年 | 628篇 |
1988年 | 531篇 |
1987年 | 624篇 |
1986年 | 505篇 |
1985年 | 728篇 |
1984年 | 692篇 |
1983年 | 598篇 |
1982年 | 626篇 |
1981年 | 590篇 |
1980年 | 545篇 |
1979年 | 505篇 |
1978年 | 467篇 |
1977年 | 500篇 |
1976年 | 423篇 |
1975年 | 434篇 |
1974年 | 392篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
Ilkka Sinisaari Hannu Pätiälä Ole Böstman E. Antero Mäkelä Esa K. Partio Eero Hirvensalo Pertti Törmälä Pentti Rokkanen 《Journal of orthopaedic science》1997,2(2):88-92
Between November 1984 and January 1994 in our department, a total of 2500 patients were treated with totally absorbable internal
fixation devices. We studied these patients and analyzed results with regard to the volume of the absorbable implants and
the development of wound infection. Of the 2500 patients 2044 were trauma patients and 456 were operated on for orthopedic
disease. In 1466 patients treated with implants made of self-reinforced polyglycolic acid (SR-PGA) only, the patients who
developed wound infection had a higher implant volume (P=0.07) than those who did not; this difference was close to statistical significance. In the 446 patients who received only
implants made of self-reinforced poly-l-lactic acid (SR-PLLA), the 5 who developed wound infection had a mean implant volume more than three times that of the non-infected
patients (P=0.01). We found that in the patients treated with the earlier SR-PGA implants, which contained a green staining material,
there was no correlation between implant volume and incidence of wound infections. On the other hand, both the non-stained
SR-PGA implants, which have been in clinical use since 1989, and the SR-PLLA implants, seem to be more predictable in terms
of wound infections. We believe that this difference, is largely due to the lower level of tissue reactions with these newer
implants. 相似文献
182.
183.
184.
185.
S. Störkel 《Der Urologe. Ausg. A》2004,43(3):118-119
186.
Dr. C. Doesch A.E. May G. Toncar-Pflumm N. Anders T. Geisler S. Kröber R. Kandolf M. Gawaz 《Der Internist》2007,48(11):1282-1289
A 48-year-old man presented with acute chest pain and a greatly increased platelet count. Emergency coronary angiographc revealed thrombotic occlusion of the right coronary artery. Coronary angioplasty and stenting were successfully combined with intracoronary abciximab administration. Due to inadequate postinterventional platelet inhibition an intensified dual antiplatelet therapy with acetylsalicylic acid (ASS) and clopidogrel was applied to prevent stent thrombosis. Due to the thrombo-embolic complication and a platelet count over 1 million/µl a cytoreductive treatment with hydroxyurea was initiated. 相似文献
187.
E. Waris M. Pakkanen K. Lassila P. Törmälä Y. T. Konttinen R. Suuronen N. Ashammakhi 《European journal of plastic surgery》2003,26(7):350-355
A wide variety of biological and alloplastic injectable biomaterials are available for soft tissue augmentation, but the ideal material has not yet been discovered. Biological materials such as collagen and hyaluronan yield temporary results, while injectable alloplasts are apt to cause varying degrees of foreign body reactions that may result in lumps and chronic inflammation.We present two cases (one is the first filed case in the world) of migratory subcutaneous inflammatory masses secondary to injection of acrylic hydrogel (DermaLive), which is an alloplastic biomaterial recently introduced into the market in Europe. Histology revealed foreign body reaction to acrylic hydrogel with granuloma formation containing multinucleated giant cells. Following this, further reports on complications have been reported elsewhere in Europe. The use and development of injectable materials, as well as alternative methods and future directions are reviewed. 相似文献
188.
Dr. K. Hekmat Dr. A. Kröner Dr. H. Stützer Prof. Dr. R. H. G. Schwinger PD Dr. S. Kampe Prof. Dr. G. B. W. E. Bennink Prof. Dr. U. Mehlhorn 《Zeitschrift für Herz-, Thorax- und Gef??chirurgie》2004,18(6):257-267
Zusammenfassung
Einleitung:
Das Ziel dieser Studie war die Entwicklung eines spezifischen Schweregradklassifizierungssystems für die Beurteilung und Vorhersage von Organfunktionsstörungen und Überleben bei herzchirurgischen Intensivpatienten.
Methoden:
Hierzu wurden konsekutiv alle erwachsenen Patienten nach einem herzchirurgischen Eingriff unter Einsatz der Herzlungenmaschine über einen Zeitraum von 3 Jahren in die Studie aufgenommen. Im Konstruktionsset erfolgte die Auswahl der Variablen mit Hilfe der Patienten, die mindestens 24 Stunden auf der Intensivstation verbrachten. Die Ergebnisse wurden dann in zwei Validierungssets mit allen Intensivpatienten überprüft. Die Qualität des Scores wurde mit dem Hosmer-Lemeshow-Test (HL) sowie der ROC-Analyse beurteilt, und mit dem APACHE-II- und dem MODS-Score verglichen.
Ergebnisse:
Insgesamt wurden 3230 Patienten über einen Zeitraum von 3 Jahren auf unserer Intensivstation aufgenommen. Die HL-Werte für den neuen Score waren 5,8 (APACHE-II: 11,3; MODS: 9,7) für das Konstruktionsset, 7,2 (APACHE-II: 8,0; MODS: 4,5) für das Validierungsset I und 5,9 für das Validierungsset II. Die Fläche unter der ROC-Kurve war 0,91 (APACHE-II: 0,86; MODS: 0,84) für den neuen Score im Konstruktionsset, 0,88 (APACHE-II: 0,84; MODS: 0,84) in dem Validierungsset I, und 0,92 in dem Validierungsset II.
Schlussfolgerung:
Der neue CASUS (Cardiac Surgery Score) zeigt für herzchirurgische Intensivpatienten eine exzellente Kalibrierung und Diskriminierung bezüglich der 30-Tage-Letalität. Die Variablen des CASUS sind einfach, reproduzierbar und werden routinemäßig in herzchirurgischen Intensivstationen erfasst. Der CASUS könnte als Expertensystem für das Diagnostizieren von Organfunktionsstörungen, der Entscheidungsfindung, der Ressourcenauswertung und Vorhersage der Letalität für herzchirurgische Intensivpatienten dienen. 相似文献
189.
Göran Bengtsson Sten Rundgren 《Archives of environmental contamination and toxicology》1992,23(2):198-205
The influence of seasonal temperature variations and liming and acidification of the soil on lead uptake in juveniles and adults of the earthworm species Lumbricus terrestris L. was studied by enclosing specimens for up to five months in net bags provided with lead-contaminated, sandy soil. Lead concentrations were analyzed in the pharynx, gizzard, muscles, seminal vesicles and cerebral ganglion. Lead distribution in whole animals was assessed after an injection of 203Pb. The lead concentrations of the tissues were mostly linearly correlated with the soil concentrations, which ranged from <0.5 to 310 mg/kg, and the highest concentrations were generally found in the ganglion. The effects on lead concentrations in tissues of lowered soil pH from 5.6 to 5.1 or raised to 5.9 were insignificant, though more lead became allocated to muscles than to ganglion when pH was lowered. The lead uptake was strongly dependent on the ambient temperature, especially in the muscles, and the concentrations were reduced by 50% or more during the cold spell in the winter season, presumably as a consequence of a low feeding activity. Though juveniles seemed more prone to take up lead, the concentrations were not significantly higher than those in adults during the winter period. The observations are discussed in the light of the use of earthworms in standardized programs for environmental hazard assessment, especially with respect to species and tissue selection. 相似文献
190.