全文获取类型
收费全文 | 16585篇 |
免费 | 753篇 |
专业分类
各国政治 | 611篇 |
工人农民 | 678篇 |
世界政治 | 1042篇 |
外交国际关系 | 527篇 |
法律 | 10960篇 |
中国共产党 | 34篇 |
中国政治 | 157篇 |
政治理论 | 3159篇 |
综合类 | 170篇 |
出版年
2021年 | 94篇 |
2020年 | 285篇 |
2019年 | 279篇 |
2018年 | 373篇 |
2017年 | 434篇 |
2016年 | 468篇 |
2015年 | 399篇 |
2014年 | 385篇 |
2013年 | 1531篇 |
2012年 | 384篇 |
2011年 | 432篇 |
2010年 | 399篇 |
2009年 | 469篇 |
2008年 | 477篇 |
2007年 | 492篇 |
2006年 | 485篇 |
2005年 | 437篇 |
2004年 | 455篇 |
2003年 | 386篇 |
2002年 | 364篇 |
2001年 | 607篇 |
2000年 | 539篇 |
1999年 | 457篇 |
1998年 | 243篇 |
1997年 | 171篇 |
1996年 | 206篇 |
1995年 | 188篇 |
1994年 | 208篇 |
1993年 | 206篇 |
1992年 | 332篇 |
1991年 | 388篇 |
1990年 | 343篇 |
1989年 | 332篇 |
1988年 | 329篇 |
1987年 | 329篇 |
1986年 | 326篇 |
1985年 | 313篇 |
1984年 | 257篇 |
1983年 | 261篇 |
1982年 | 178篇 |
1981年 | 196篇 |
1980年 | 151篇 |
1979年 | 204篇 |
1978年 | 153篇 |
1977年 | 127篇 |
1976年 | 109篇 |
1975年 | 108篇 |
1974年 | 119篇 |
1973年 | 128篇 |
1972年 | 86篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
961.
Binda S Borer UV Gehrig C Hochmeister M Budowle B 《Forensic science international》2000,108(2):117-120
Allele and genotype frequencies for the ten STR loci D3S1358, VWA, D16S539, D2S1338, D8S1179, D21S11, D18S51, D19S433, TH01, FGA were determined in a Swiss Caucasian population sample (n=206) using the AmpFISTR SGM Plus Amplification kit. Electrophoresis was carried out on an ABI PRISM CE 310 Genetic Analyzer instrument. Previously, allele frequencies were published for the 13 STR loci D3S1358, VWA, FGA, D8S1179, D21S11, D18S51, D5S818, D13S317, D7S820, THO1, TPOX, CSF1PO and D16S539 for the same samples (n=206) amplified with the AmpFISTR Profiler Plus and Cofiler PCR Amplification kits. Since the results for the eight loci D3S1358, VWA, FGA, D8S1179, D21S11, D18S51, THO1, D16S539 shared between the AmpFISTR SGM Plus, Profiler Plus and Cofiler PCR Amplification kits already are published, only the allele frequencies for the two STR loci D2S1338 and D19S433 are reported in this paper. The two loci meet Hardy-Weinberg expectations. In addition, there is little evidence for association of alleles among the 15 loci (amplified with the Profiler, Cofiler, and SGM Plus amplification kits). The allelic frequency data can be used in forensic analyses to estimate the frequency of a multiple STR locus DNA profile in the Swiss population. 相似文献
962.
Thomsen JL 《Forensic science international》2000,110(2):139-144
It was the aim of the present investigation to apply a broad spectrum of analyses to forensic autopsies of alcoholics in order to estimate the significance of the various analytical methods with reference to the cause and manner of death. The analyses were performed on a consecutive series of 73 medico-legal autopsies in alcoholics. Both extensive histology as well as toxicology and microbiology were used. The microbiology did not contribute substantially to the determination of the cause of death, while histology was decisive in six cases. Toxicology analyses were necessary for determining the cause of death in 37 cases. The results of the investigation may help in the selection of analytical priorities. 相似文献
963.
Lantz PM Richardson LC Sever LE Macklem DJ Hare ML Orians CE Henson R 《Journal of health politics, policy and law》2000,25(3):451-471
Funding for many mass screening programs for low-income and uninsured populations provides resources for screening tests, yet only rarely does it provide coverage for necessary follow-up diagnostic and treatment services. The National Breast and Cervical Cancer Early Detection Program (NBCCEDP), a federally funded initiative that provides cancer screening to low-income uninsured and underinsured women, covers some diagnostic follow-up tests and no treatment services. We conducted in-depth case studies of seven state programs participating in the NBCCEDP to investigate the strategies and approaches being used to secure diagnostic and treatment services. The results suggest that the program relies on a patchwork of resources--at state and local levels--to provide diagnostic and treatment services. This includes a number of components of local safety nets, all of which are unstable and have uncertain futures. Public health disease-screening initiatives need to reconsider the feasibility of continued reliance on case-by-case appeals to the local safety net for diagnostic follow-up and treatment services. 相似文献
964.
965.
966.
Iezzoni LI 《Journal of health politics, policy and law》2000,25(6):1157-1167
967.
Empirical studies have found that policies aimed at reducing youth access to tobacco have been successful at increasing retail compliance, but their effects on actual tobacco use are mixed. This article presents a model of youth access policies that helps explain the apparently conflicting results in the extant literature, provides a framework for future empirical studies, and suggests implications for public policy. Our model highlights the interaction of components in a well-designed policy, including sufficient compliance checks, penalties, and community involvement. It also illustrates why it will be difficult to eliminate all of youth supply. Nonretail sources, such as borrowing or stealing from parents and siblings and purchasing from older peers through black markets, are an important component of youth supply and become more important as retail access is reduced. The analysis is limited to policies that affect the retail supply of cigarettes but suggests the need for other policies that affect the demand for cigarettes, such as taxes and cessation policies, in order to further reduce youth smoking rates. 相似文献
968.
Schmidt P Schmolke C Musshoff F Menzen M Prohaska C Madea B 《Forensic science international》2000,113(1-3):423-433
In animal experiment and in cell culture, chronic morphine treatment has been followed by a reduction as well as an increase of the delta-opioid receptor (OR) number. The present postmortem morphometric study of morphine-related fatalities of drug addicts (n=12, 22-35 years old, with blood unconjugated morphine levels from 27.1 to 407 ng/ml, m.v. 176.9 ng/ml) versus a non-addicted control group (n=13, 10-44 years old) is intended to examine whether chronic opiate exposure also affects the numerical density of deltaOR expressing neurons in the human neocortex (area 10 according to Brodmann (Vergleichende Lokalisationslehre der Grosshirnrinde (1909) Johann Ambrosius Barth, Leipzig)). For the immunohistochemical procedure, vibratome sections (100 microm) were incubated with a monoclonal antibody against the deltaOR diluted 1:100, and immunoreactive sites were visualized using an immunoperoxidase protocol. The numerical densities of OR expressing and Nissl-stained neurons were assessed morphometrically (camera lucida drawings). In both collectives, the anti deltaOR immunoreactivity was predominantly localized in pyramidal neurons of layers (L) II/III and V as well as in round and ovoid neurons of L VI. In the drug-related fatalities, the density of neurons expressing deltaOR protein amounted for 2515+/-240/mm(3), in the control group for 2616+/-204/mm(3), thus displaying no statistically significant difference. These findings go along with the binding behavior of opioid ligands in postmortem brains of heroin addicts revealing similar receptor densities and affinities in the control subjects and addicts. 相似文献
969.
Zhu BL Oritani S Shimotouge K Ishida K Quan L Fujita MQ Ogawa M Maeda H 《Forensic science international》2000,113(1-3):443-447
To outline the recent features of methamphetamine-related fatalities from the medico-legal point of view, a retrospective investigation of forensic autopsy cases involving methamphetamine during a 5-year period (1994-1998) in the southern half of Osaka city and surrounding areas (about 1.57 million population) was undertaken. Among 646 autopsy cases, methamphetamine was detected in 15 victims (nine males, six females; 16-71 years of age; most frequently in males in their thirties). Primary scenes of fatal events were concentrated in the middle of the city. About half of them were transferred from emergency medical centers (survival time, up to 30 h). The cause and manner of death were: methamphetamine poisoning (n=4), homicide (n=4), accidental falls and aspiration from drug abuse (n=4), fire death (n=1), myocardial infarction (n=1), and cerebral hemorrhage (n=1) under drug influence. Usually injection scars and fresh puncture sites were found. Blood methamphetamine concentrations were 2.29-17.05 micromol/dl in the fatal poisoning, 0. 44-3.80 micromol/dl in deaths from other extrinsic causes (trauma), and 1.35-2.17 micromol/dl in cardio- and cerebrovascular strokes. Common complications were cardiomyopathy, cerebral perivasculitis and liver cirrhosis/interstitial hepatitis. Fatal and nonfatal methamphetamine poisonings are separately dealt with by the administrative medical examiner's office and in emergency medical centers. Tightly cooperative approaches of clinical and medico-legal experts are required for the effective social and medical management of drug abuse. 相似文献
970.
This paper describes a collaborative exercise organised under the auspices of the European Network of Forensic Science Institutes (ENFSI). The purpose of this EU (European Union) funded group is to carry out research to enable STR loci to be compared between European laboratories, ultimately leading to the formation of a pan-European database. Accordingly, an exercise was designed to evaluate a prototype STR multiplex system manufactured by Applied Biosystems (ABD). Each laboratory was sent 12 samples to analyse along with a multiplex kit. Of specific interest was the definition of parameters to define the efficiency of the system. Stutter, split allelic peaks (differing by one base), pull-up, heterozygous balance and between locus balance were all objectively measured. Once the important parameters are defined it is possible to directly compare performances of different multiplexes and the different laboratories carrying out the tests. Since the multiplex used was a prototype system, this exercise cannot be regarded as a proficiency test. 相似文献