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   6800篇
  免费   285篇
  国内免费   1篇
各国政治   369篇
工人农民   47篇
世界政治   898篇
外交国际关系   805篇
法律   3330篇
中国共产党   308篇
中国政治   574篇
政治理论   394篇
综合类   361篇
  2023年   28篇
  2022年   30篇
  2021年   25篇
  2020年   29篇
  2019年   41篇
  2018年   56篇
  2016年   37篇
  2015年   38篇
  2014年   168篇
  2013年   115篇
  2012年   432篇
  2011年   492篇
  2010年   225篇
  2009年   170篇
  2008年   344篇
  2007年   403篇
  2006年   413篇
  2005年   393篇
  2004年   345篇
  2003年   354篇
  2002年   326篇
  2001年   253篇
  2000年   254篇
  1999年   154篇
  1998年   102篇
  1997年   89篇
  1996年   84篇
  1995年   98篇
  1994年   112篇
  1993年   77篇
  1992年   74篇
  1991年   80篇
  1990年   61篇
  1989年   72篇
  1988年   107篇
  1987年   87篇
  1986年   84篇
  1985年   100篇
  1984年   98篇
  1983年   97篇
  1982年   69篇
  1981年   70篇
  1980年   86篇
  1979年   53篇
  1978年   17篇
  1976年   16篇
  1964年   22篇
  1962年   16篇
  1959年   18篇
  1957年   15篇
排序方式: 共有7086条查询结果,搜索用时 15 毫秒
991.
Acute pancreatitis represents a spectrum of disease, ranging from a mild, transitory illness to a severe, rapidly progressive hemorrhagic form, with massive necrosis and mortality rates of up to 24%. The reported incidence of acute pancreatitis diagnosed first at clinicopathologic autopsy ranges between 30% and 42%. To better describe outpatient fatalities due to acute pancreatitis that present as sudden, unexpected death, we retrospectively reviewed the autopsy files at the Institute of Legal Medicine, University of Hamburg, Germany, from 2000-2004. Individual cases were analyzed for sex, age, race, circumstances of death, social background of the deceased and previous medical history, seasonal occurrence of the disease, blood alcohol concentration at the time of death, body mass index, autopsy findings, histopathology, and etiology of acute pancreatitis. Among the 6178 autopsies carried out during the 5-year period evaluated, there were 27 cases of acute pancreatitis that presented as sudden, unexpected death. In all cases, the diagnosis was first made at autopsy. The male:female ratio was 1.7:1 and the mean age was 52 years (range, 30-91 years). Etiologies of acute pancreatitis included alcohol (n=19), gall stones (n=2), other identified etiologic factors (n=3), and idiopathic (n=3). Complications of acute pancreatitis included lung edema and/or acute respiratory distress syndrome, peritonitis, disseminated intravascular coagulation, and sepsis. At least 20 subjects (74%) had lived isolated, with no social contacts. Contrary to the clinical observations of a clear seasonal variation in the onset of acute pancreatitis, we found no correlation between death due to acute pancreatitis and a specific month or season. Many prior studies have suggested that the majority of deaths in severe acute pancreatitis occur in the late phase of the disease as a result of pancreatic sepsis. Conversely, in the present study, the majority of affected individuals died during the very early phase of the disease. While gallstones represent the main etiologic factor in most larger clinical series, biliary etiology seems to play only a minor role in outpatient deaths undergoing medicolegal autopsies. Data derived from medicolegal autopsy studies should be included in future population-based studies of acute pancreatitis.  相似文献   
992.
In a morning in January, a male in his early sixties was found dead in an outdoor parking area. The minimum temperature during the night before he was found dead was estimated to be 4.0 degrees C. Autopsy revealed the pinkness of hypostasis, slight abrasions and bruises on the face and the extremities, collapse of the lungs, and slight gastric submucosal hemorrhage. Histologic examination revealed compact arrangement of cardiac muscle fibers and cytoplasmic vacuolation in the adenohypophysis. Toxicologic examination demonstrated hyperacetonemia (51.2 microg/mL). Ubiquitin, one of the stress proteins that are induced by several stimuli, including severe cold, was detected in several organs. We concluded that the cause of his death was lethal hypothermia. In addition, hemorrhages were observed in the subfascial and/or intramuscular parts of the pectoralis minor, first intercostal, and iliopsoas muscles. Although it has been reported that iliopsoas muscle hemorrhage can result from hypothermia, there have been few reports concerning hypothermia-associated hemorrhages of the pectoralis minor and/or intercostal muscles. We presumed that intense shivering and/or effort ventilation during the course of lethal hypothermia might cause these muscle hemorrhages.  相似文献   
993.
Studies of intimate partner violence (IPV) and work have been primarily conducted with women in low-wage low-status (LWLS) positions, as much of this research has focused on poverty, welfare, and homelessness. Although women in LWLS positions represent a large percentage of working women in the United States, it is also important to investigate experiences of women in high-wage high-status (HWHS) positions because a growing number of women are employed within such jobs. We propose gender role theory can be used to explain occurrences of IPV among women in HWHS positions and their utilization of organizational benefits. We suggest those in HWHS positions may be likely to have access to organizational benefits (e.g., medical, vacation, and flexible work schedules) and the ability to utilize the Family and Medical Leave Act. However, prevailing gender roles existing in organizations may render women in HWHS positions unlikely to use benefits or to take leave.  相似文献   
994.
This study examined the relationship between a self-reported history of child physical and sexual abuse and chronic pain among women (N = 3,381) in a provincewide community sample. Chronic pain was significantly associated with physical abuse, education, and age of the respondents and was unrelated to child sexual abuse alone or in combination with physical abuse, mental disorder (anxiety, depression, or substance abuse), or low income. Number of health problems and mental health disorders did not mediate the relationship between physical abuse and chronic pain. Despite considerable evidence from the clinical literature linking exposure to child maltreatment and chronic pain in adulthood, this may well be the first population-based study to investigate this relationship for child physical and sexual abuse independently. The significant association between childhood history of physical abuse and pain in adulthood calls for a greater awareness of the potential for chronic pain problems associated with this type of maltreatment. Further research is needed to understand the mechanism for this complex relationship.  相似文献   
995.
Hidden risks     
Carmichael M 《Newsweek》2007,149(11):48-49
  相似文献   
996.
Allele frequencies of 15 short tandem repeat (STR) loci, D8S1179, D21S11, D7S820, CSF1PO, D3S1358, TH01, D13S317, D16S539, D2S1338, D19S433, vWA, TPOX, D18S51, D5S818 and FGA, were determined for 98 unrelated Africans from South Africa and 98 unrelated Europeans from South Africa using the AmpFlSTR Identifiler PCR amplification kit. The genotype frequency distributions of the 15 STR loci were in the Hardy-Weinberg equilibrium for both populations.  相似文献   
997.
Allele frequencies for 18 STR autosomal loci (D3S1358, VWA, FGA, D8S1179, D21S11, D18S51, D5S818, D13S317, D7S820, D16S539, TH01, TPOX, CSF1PO, Penta D, Penta E, D19S433, D2S1338 and SE33) were obtained from a sample of 191-500 unrelated individuals from Costa Rica, Central America.  相似文献   
998.
Yan H  Xiang P  Bo J  Shen M 《法医学杂志》2007,23(6):441-443
目的建立测定血液中美西律(mexiletine)的液相色谱-串联质谱联用法(LC-MS/MS)。方法采用简便的乙腈蛋白沉淀法对血液进行预处理,应用Allure PFP Propyl液相柱分离,用电喷雾正离子模式离子化,多反应监测模式对美西律进行分析。结果美西律与内标纳洛酮分离良好,在0.02~10.00μg/mL内线性关系良好,相关系数为0.9999,回归方程为y=0.0283x-0.0151,日内与日间精密度的RSD均小于15%,最低检测限为0.01μg/mL。结论建立的LC-MS/MS方法简单、灵敏、可靠,可同时适用于美西律临床药物监测和法医毒物分析的需要。  相似文献   
999.
理论学派的法律是一个在认知上并不可靠的领域。它所采用的方法和视角已经受到当下政治和观念的冲击,并且因缺乏理论与实践的互动而显得摇摆不定。在本文中,我将阐述这一看似荒谬的结论,即:随着学术界与司法界不断改变对行政法形态和价值的塑造,法律将通过不断的去法化和日趋经  相似文献   
1000.
Several commercial PCR multiplex kits incorporate the amelogenin locus for the purpose of human gender identification. Consequently, erroneous results in the electropherogram profile of this locus can carry important forensic implications. In this study, dropout of the amelogenin Y allele was detected in 5 out of 77 phenotypically normal Kathmandu males using the AmpFlSTR Identifiler kit. A battery of male-specific markers including SNPs, STRs, STSs, and a minisatellite were amplified for the five amelogenin null samples in order to delineate the breakpoints of the deletions as well as assess the overall integrity of the Y-chromosome. This study represents the first to examine the haplogroup affiliation of the AMGY deletions. The analyses performed suggest a single origin for the five deletions as indicated by their allocation to a specific Y-haplogroup (J2b2-M241), related Y-STR haplotypes and identical regional localization of breakpoints. The age estimated from the microsatellite variation for the amelogenin deletions (if they are associated by descent) is approximately 6.5+/-3.3 ky, younger than the previously reported related age of the M241 haplogroup representatives (13-14 ky). Our data in combination with previous publications suggest a concentration of afflicted individuals in the Indian subcontinent, possibly as a result of common ancestry. The elevated incidence of the amelogenin dropout in these populations accentuates the need to utilize other loci for gender determination in order to obtain an accurate set of inclusion criteria in forensic casework.  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