首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1124篇
  免费   58篇
  国内免费   7篇
耳鼻咽喉   18篇
儿科学   40篇
妇产科学   5篇
基础医学   155篇
口腔科学   106篇
临床医学   93篇
内科学   153篇
皮肤病学   43篇
神经病学   46篇
特种医学   69篇
外科学   201篇
综合类   30篇
预防医学   39篇
眼科学   15篇
药学   67篇
中国医学   4篇
肿瘤学   105篇
  2023年   9篇
  2022年   19篇
  2021年   29篇
  2020年   29篇
  2019年   19篇
  2018年   37篇
  2017年   14篇
  2016年   22篇
  2015年   19篇
  2014年   32篇
  2013年   60篇
  2012年   69篇
  2011年   55篇
  2010年   60篇
  2009年   38篇
  2008年   54篇
  2007年   64篇
  2006年   47篇
  2005年   45篇
  2004年   34篇
  2003年   46篇
  2002年   43篇
  2001年   21篇
  2000年   13篇
  1999年   16篇
  1998年   14篇
  1997年   8篇
  1996年   6篇
  1995年   8篇
  1994年   5篇
  1993年   7篇
  1992年   15篇
  1991年   12篇
  1990年   19篇
  1989年   14篇
  1988年   19篇
  1987年   13篇
  1986年   30篇
  1985年   17篇
  1984年   10篇
  1983年   10篇
  1981年   6篇
  1980年   6篇
  1979年   9篇
  1978年   5篇
  1977年   7篇
  1976年   10篇
  1973年   4篇
  1970年   7篇
  1968年   6篇
排序方式: 共有1189条查询结果,搜索用时 15 毫秒
1.
PurposeOur purpose was to determine the effect of chemoradiotherapy (CRT) on patient-reported quality of life (QOL) for patients with intact pancreas cancer.Methods and MaterialsWe reviewed a prospective QOL registry for patients with intact, clinically localized pancreatic ductal adenocarcinoma treated with CRT between June 2015 and November 2018. QOL was assessed pre-CRT (immediately before CRT, after neoadjuvant chemotherapy) and at the completion of CRT with the Functional Assessment of Cancer Therapy-Hepatobiliary (FACT-Hep) and its component parts: FACT-General (FACT-G) and hepatobiliary cancer subscore (HCS). A minimally important difference from pre-CRT was defined as ≥ 6, 5, and 8 points for FACT-G, HCS, and FACT-Hep, respectively.ResultsOf 157 patients who underwent CRT, 100 completed both pre- and post-CRT surveys and were included in the primary analysis. Median age at diagnosis was 65 years (range, 23-90). National Comprehensive Cancer Network resectability status was resectable (3%), borderline resectable (40%), or locally advanced (57%). Folinic acid, 5-fluorouracil, irinotecan, and oxaliplatin (FOLFIRINOX) (75%) or gemcitabine and nab-paclitaxel (42%) were given for a median of 6 cycles (range, 0-42) before CRT. Radiation therapy techniques included 3-dimensional conformal (22%), intensity modulated photon (55%), and intensity modulated proton (23%) radiation therapy to a median dose of 50 Gy (range, 36-62.5). Concurrent chemotherapy was most commonly capecitabine (82%). Sixty-three patients (63%) had surgery after CRT. The mean decline in FACT-G, HCS subscale, and FACT-Hep from pre- to post-CRT was 3.5 (standard deviation [SD], 13.7), 1.7 (SD 7.8), and 5.2 (SD 19.4), respectively. Each of these changes were statistically significant, but did not meet the minimally important difference threshold. Pancreatic head tumor location was associated with decline in FACT-Hep. Nausea was the toxicity with the greatest increase from pre- to post-CRT by both physician-assessment and patient-reported QOL.ConclusionsFor patients with intact pancreatic adenocarcinoma, modern CRT is well tolerated with minimal decline in QOL during treatment.  相似文献   
2.
3.
Esophageal pH monitoring is the accepted standard for the investigation of gastroesophageal reflux (GER) in adults. A postal questionnaire was sent to 912 United Kingdom paediatric physicians & surgeons. Five hundred forty-seven (61%) replied, with 124 (22.7%) currently using the technique, mostly in conjunction with barium swallow and/or esophagoscopy. The use of pH monitoring to quantify GER was also accepted in principal as being the best determinant of reflux by a further 186 (34%), but as yet was unavailable in their hospitals. Pediatricians were also questioned as to their management of children with GER. The majority were treated medically with a variety of antireflux medication, with only 237 (42%) referring cases for surgery.  相似文献   
4.
目的探讨肝、肺细胞因子基因表达与腹腔吞噬细胞上清液、循环血中细胞因子含量的关系,为临床诊治多细菌感染引发的炎症提供实验依据.方法将30只小鼠分为假手术对照组(sham组)和盲肠结扎组(CLP组).采用RT-PCR法检测肝脏和肺脏肿瘤坏死因子α(TNF-α)和白细胞介素10(IL-10)的基因表达情况,采用ELISA法检测腹腔巨噬细胞上清液和循环血液中相应细胞因子含量.结果CLP组的TNF-α、IL-10基因表达和腹腔巨噬细胞上清液、循环血液中的相应细胞因子含量均高于sham组.CLP后18h组与4h组比较,TNF-α在腹腔巨噬细胞上清液、循环血液中的活性均有显著性差异(P<0.05),在肝、肺中基因表达有非常显著性差异(P<0.01);IL-10在腹腔巨噬细胞上清液和循环血液中的含量无显著性差异,而在肝、肺中基因表达有显著性差异.结论发生多细菌感染性炎症时,肝、肺参与细胞因子的表达;血液中细胞因子含量不能完全代表组织器官内的基因表达情况;多细菌感染性炎症治疗应考虑靶器官细胞因子的表达状态.  相似文献   
5.
Summary Six hundred and thirty four adolescents and children aged three days to 17 years treated with ciprofloxacin on a compassionate basis were analysed for drug safety. 62% of the ciprofloxacin courses were given to patients with respiratory tract infection, primarily those with acute pulmonary exacerbation of cystic fibrosis. The mean daily oral dose was 25.2 mg/kg body weight. The duration of treatment ranged from one to 880 days (mean 22.8 days). Because of the arthropathogenic potential of quinolones in juvenile animals special emphasis was placed on the evaluation of musculoskeletal adverse events. Arthralgia considered by the treating physicians to be related to ciprofloxacin was reported in eight children, all of whom were females. Arthralgia resolved in all children. Some of these children were given subsequent courses of ciprofloxacin with no complaints of arthralgia. Overall, the safety profile of ciprofloxacin in children is not substantially different from that of adults.
Verträglichkeit von Ciprofloxacin bei Kindern unter besonderer Beachtung der Gelenke. Auswertung weltweit dokumentierter Problemfälle
Zusammenfassung Die Verträglichkeit des Ciprofloxacin nach Anwendung bei 634 Jugendlichen und Kindern im Alter von drei Tagen bis 17 Jahren wurde analysiert. 62% der Behandlungen mit Ciprofloxacin erhielten Patienten mit Atemwegsinfektionen, insbesondere mit akuter pulmonaler Exazerbation der Mukoviszidose. Der Mittelwert der oralen Tagesdosis war 25,2 mg/kg Körpergewicht. Die Therapiedauer variierte zwischen 1 und 880 Tagen (Mittelwert 22,8 Tage). Wegen der gelenkknorpelschädigenden Wirkung der Chinolone bei juvenilen Versuchstieren wurde besondere Aufmerksamkeit der Beurteilung der mit Gelenken verbundenen Nebenerscheinungen gewidmet. Arthralgie, die von den behandelnden Ärzten als Folge der Ciprofloxacin-Behandlung beurteilt wurde, ist bei acht Kindern berichtet worden. Alle waren weiblich. Die Arthralgie verschwand bei allen Kindern. Einige dieser Kinder erhielten nachträgliche Behandlungen mit Ciprofloxacin ohne Auftreten arthralgischer Beschwerden. Generell unterschied sich das Verträglichkeitsprofil bei Kindern nicht wesentlich von dem der Erwachsenen.
  相似文献   
6.
The intubating laryngeal mask airway: an initial assessment of performance   总被引:2,自引:0,他引:2  
A new prototype of the laryngeal mask airway (LMA), the intubating laryngeal mask airway (ILMA), was used to facilitate tracheal intubation in 100 fasted patients presenting for elective surgery. Alignment of the ILMA with the larynx was assessed fibreoptically before intubation without the investigator performing the intubation being aware of the view score. Ease of intubation correlated with the view obtained and with the degree of manipulation of the ILMA needed to achieve tracheal intubation. Intubation was successful in 93 patients. Of the seven intubation failures, five occurred in the first 20 patients. Conventional connection to the breathing system and ventilation of the lungs of the patients were possible throughout the intubation procedure.   相似文献   
7.
Our data suggest that DOX resistance in P388/R-84 cells may result, at least in part, from reduced free radical formation by both suppression of flavin reductase(s) and overexpression of certain antioxidant enzymes such as GSH peroxidase and catalase. In addition, our results, in conjunction with other studies, indicate that flavin reductase(s) and antioxidant enzymes are differentially altered in cancer cells with acquired or de novo resistance to DOX. Further studies are needed, however, to elucidate the mechanism(s) by which the gene expression of these enzymes is regulated in drug-sensitive and -resistant cells.  相似文献   
8.
K Varty  D Evans    L Kapila 《Gut》1993,34(11):1478-1481
The original diagnostic 24 hour pH monitoring data in 57 children with gastro-oesophageal reflux (GOR) were retrospectively reviewed after a minimum of one year follow up. The tracings of children who responded to medical treatment were compared with those who failed to respond and required a fundoplication. Children with GOR secondary to oesophageal atresia/tracheo-oesophageal fistula and neurological conditions (n = 12) were analysed separately from those with primary GOR (n = 45). Children with primary GOR requiring a fundoplication (n = 9) had increased daytime reflux. The percentage time pH < 4 was the best discriminator (21% v 7%) with a threshold of 18% giving a 92% specificity and a 70% sensitivity. For children with secondary GOR the percentage time pH < 4 at night was significantly higher (29% v 3.7%) in those requiring a fundoplication (n = 5). A threshold of 18% gave an 80% specificity and an 86% sensitivity. These results show that both daytime and night time pH monitoring data can be of prognostic value in different subgroups of children with GOR. A percentage time pH < 4 of greater than 18% was a useful threshold to apply when evaluating the pH monitoring data.  相似文献   
9.
Meningiomas are not often aspirated unless they erode the skull, occur intraorbitally, or present as swelling in the head and neck region. We describe the cytologic findings of fine-needle aspiration cytology (FNAC) in four cases of meningioma that presented with swellings in the head and neck region. The patients underwent surgery, and the diagnosis of meningioma was confirmed. Three of the four cases were reported as aggressive meningiomas on histopathology.  相似文献   
10.
VP1 sequences were determined for poliovirus type 1 isolates obtained over a 189-day period from a poliomyelitis patient with common variable immunodeficiency syndrome (a defect in antibody formation). The isolate from the first sample, taken 11 days after onset of paralysis, contained two poliovirus populations, differing from the Sabin 1 vaccine strain by ~10%, differing from diverse type 1 wild polioviruses by 19 to 24%, and differing from each other by 5.5% of nucleotides. Specimens taken after day 11 appeared to contain only one major poliovirus population. Evolution of VP1 sequences at synonymous third-codon positions occurred at an overall rate of ~3.4% per year over the 189-day period. Assuming this rate to be constant throughout the period of infection, the infection was calculated to have started ~9.3 years earlier. This estimate is about the time (6.9 years earlier) the patient received his last oral poliovirus vaccine dose, approximately 2 years before the diagnosis of immunodeficiency. These findings may have important implications for the strategy to eliminate poliovirus immunization after global polio eradication.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号