全文获取类型
收费全文 | 1295篇 |
免费 | 39篇 |
专业分类
各国政治 | 44篇 |
工人农民 | 255篇 |
世界政治 | 98篇 |
外交国际关系 | 78篇 |
法律 | 581篇 |
中国政治 | 20篇 |
政治理论 | 248篇 |
综合类 | 10篇 |
出版年
2023年 | 4篇 |
2022年 | 5篇 |
2021年 | 6篇 |
2020年 | 24篇 |
2019年 | 30篇 |
2018年 | 46篇 |
2017年 | 46篇 |
2016年 | 36篇 |
2015年 | 41篇 |
2014年 | 36篇 |
2013年 | 171篇 |
2012年 | 31篇 |
2011年 | 38篇 |
2010年 | 33篇 |
2009年 | 42篇 |
2008年 | 46篇 |
2007年 | 49篇 |
2006年 | 41篇 |
2005年 | 48篇 |
2004年 | 62篇 |
2003年 | 42篇 |
2002年 | 44篇 |
2001年 | 23篇 |
2000年 | 25篇 |
1999年 | 16篇 |
1998年 | 13篇 |
1997年 | 28篇 |
1996年 | 32篇 |
1995年 | 16篇 |
1994年 | 25篇 |
1993年 | 20篇 |
1992年 | 28篇 |
1991年 | 23篇 |
1990年 | 18篇 |
1989年 | 14篇 |
1988年 | 13篇 |
1987年 | 8篇 |
1986年 | 15篇 |
1985年 | 12篇 |
1984年 | 9篇 |
1983年 | 11篇 |
1982年 | 11篇 |
1981年 | 11篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 7篇 |
1977年 | 7篇 |
1976年 | 5篇 |
1975年 | 3篇 |
1974年 | 4篇 |
排序方式: 共有1334条查询结果,搜索用时 15 毫秒
321.
Bacterial species with high DNA sequence similarity to pathogens could affect the specificity of assays designed to detect biological threat agents in environmental samples. The natural presence of four pathogenic bacteria, Bacillus anthracis, Clostridium perfringens, Francisella tularensis, and Yersinia pestis and their closely related species, was determined for a large collection of soil and aerosol samples. Polymerase chain reaction (PCR) and gene sequencing were used using group-specific 16S rRNA primers to identify pathogens and related species, and pathogen-specific virulence genes. Close relatives of B. anthracis (B. cereus group species) were detected in 37% of the soils and 25% of the aerosol samples. The B. anthracis protective antigen (pag) gene or a close homolog was detected in 16 of these samples. For the other three pathogen groups, the frequency of detection was much lower, and none of the samples were positive with both the phylogenetic and virulence gene primer sets. 相似文献
322.
Frye V Manganello J Campbell JC Walton-Moss B Wilt S 《Journal of interpersonal violence》2006,21(10):1286-1313
It has been proposed that two distinct forms of intimate partner violence exist: intimate terrorism and situational couple violence. This article describes the distribution of factors that characterize intimate terrorism and situational couple violence, including controlling behaviors, violence escalation, and injury, among a representative sample of 331 physically assaulted women living in 11 North American cities. In addition, respondent, partner, and relationship characteristics associated with each form of violence are identified. Most women who experienced physical assault also experienced controlling behavior by their male partner. In multivariate analyses, respondent's young age, violence escalation in the relationship, partner's access to guns, previous arrests for domestic violence offenses, poor mental health, and previous suicide attempts or threats were associated with intimate terrorism, defined as experiencing one or more controlling behaviors. These results suggest that situational couple violence is rare and that moderate and high levels of controlling behaviors are associated primarily with partner factors. 相似文献
323.
324.
Yeung SH Greenspoon SA McGuckian A Crouse CA Emrich CA Ban J Mathies RA 《Journal of forensic sciences》2006,51(4):740-747
A 96-channel microfabricated capillary array electrophoresis (muCAE) device was evaluated for forensic short tandem repeat (STR) typing using PowerPlex 16 and AmpFlSTR Profiler Plus multiplex PCR systems. The high-throughput muCAE system produced high-speed <30-min parallel sample separations with single-base resolution. Forty-eight previously analyzed single-source samples were accurately typed, as confirmed on an ABI Prism 310 and/or the Hitachi FMBIO II. Minor alleles in 3:1 mixture samples containing female and male DNA were reliably typed as well. The instrument produced full profiles from sample DNA down to 0.17 ng, a threshold similar to that found for the ABI 310. Seventeen nonprobative samples from various evidentiary biological stains were also correctly typed. The successful application of the muCAE device to actual forensic STR typing samples is a significant step toward the development of a completely integrated STR analysis microdevice. 相似文献
325.
Margulies S Prange M Myers BS Maltese MR Ji S Ning X Fisher J Arbogast K Christian C 《Forensic science international》2006,164(2-3):278-9; author reply 282-3
326.
327.
Gruszecki AC Robinson CA Kloda S Brissie RM 《The American journal of forensic medicine and pathology》2005,26(1):96-98
Several studies have shown that ethanol can be produced in urine infected with yeast or bacteria in vitro. We present the unusual case of a diabetic woman in whom ethanol was produced in her urine in vivo. The decedent was a 19-year-old woman who was noncompliant with her diabetes treatment. She presented to a local hospital in severe diabetic ketoacidosis and died shortly thereafter. Upon arrival at the hospital, a blood glucose of 553 mg/dL was detected. A urinalysis was positive for ketones (> 80 mg/dL), glucose (> 1000 mg/dL), and large budding yeast forms. A drug screen performed on the urine was positive for ethanol. At the coroner/medical examiner office, an autopsy was negative for significant anatomic findings. Toxicology analysis revealed a urine ethanol level 0.32 g/dL, although no ethanol was detected in blood or vitreous samples. A urine gram stain and culture identified Candida glabrata. A retrospective case review of all deaths related to diabetes examined at the coroner/medical examiner office from 1986 to 2003 did not reveal other cases with similar findings. This case of a noncompliant, juvenile-diabetic woman illustrates a rare finding of apparent in vivo glucose fermentation by C. glabrata to form ethanol in the urine. This case also highlights a potential difficulty in toxicologic analysis and interpretation using urine only. 相似文献
328.
Elliott GC Cunningham SM Linder M Colangelo M Gross M 《Journal of interpersonal violence》2005,20(12):1663-1684
This research examines the connection between physical abuse and social isolation. Using data from the National Youth Survey, a measure of self-perceived social isolation was constructed indicating the extent to which respondents feel detached from their friends and from school. Those who had experienced violence were predicted to be more isolated than those who had not. Results strongly supported the hypothesis, controlling for theoretically relevant variables. Explanation is provided in terms of damage to attachment skills, social competence, and self-esteem concomitant to being a victim of abuse. Males were more socially isolated than females, and Hispanics more than Whites. Children with involved parents were less socially isolated; those whose parents experienced normlessness were more isolated. Children who recently experienced a stressful event or were from riskier neighborhoods were more isolated. The number of children in the family was positively related to isolation. Social isolation decreases between seventh and eighth grades. 相似文献
329.
330.