全文获取类型
收费全文 | 4955篇 |
免费 | 283篇 |
国内免费 | 1篇 |
专业分类
各国政治 | 356篇 |
工人农民 | 34篇 |
世界政治 | 670篇 |
外交国际关系 | 768篇 |
法律 | 1959篇 |
中国共产党 | 313篇 |
中国政治 | 572篇 |
政治理论 | 214篇 |
综合类 | 353篇 |
出版年
2023年 | 28篇 |
2022年 | 29篇 |
2021年 | 24篇 |
2020年 | 29篇 |
2019年 | 41篇 |
2018年 | 51篇 |
2016年 | 34篇 |
2015年 | 35篇 |
2014年 | 162篇 |
2013年 | 112篇 |
2012年 | 288篇 |
2011年 | 330篇 |
2010年 | 201篇 |
2009年 | 156篇 |
2008年 | 234篇 |
2007年 | 269篇 |
2006年 | 262篇 |
2005年 | 237篇 |
2004年 | 208篇 |
2003年 | 218篇 |
2002年 | 191篇 |
2001年 | 149篇 |
2000年 | 149篇 |
1999年 | 100篇 |
1998年 | 89篇 |
1997年 | 82篇 |
1996年 | 70篇 |
1995年 | 83篇 |
1994年 | 79篇 |
1993年 | 52篇 |
1992年 | 45篇 |
1991年 | 63篇 |
1990年 | 56篇 |
1989年 | 67篇 |
1988年 | 102篇 |
1987年 | 84篇 |
1986年 | 80篇 |
1985年 | 92篇 |
1984年 | 89篇 |
1983年 | 92篇 |
1982年 | 59篇 |
1981年 | 62篇 |
1980年 | 81篇 |
1979年 | 40篇 |
1964年 | 22篇 |
1962年 | 16篇 |
1961年 | 15篇 |
1959年 | 17篇 |
1957年 | 16篇 |
1956年 | 14篇 |
排序方式: 共有5239条查询结果,搜索用时 15 毫秒
181.
182.
183.
184.
Gusmão L González-Neira A Sánchez-Diz P Lareu MV Amorim A Carracedo A 《Forensic science international》2000,112(1):49-57
The amplification of the STR DYS391, using the primers described in the Genome Data Base (GDB: G00-365-251), shows not only an additional band to the Y-specific one in males with a size range of 26 bp less than those of DYS391 locus alleles, but also a polymorphic pattern in females in the same size range as the additional band observed in males. The DYS391 pattern in families reflects a Y-specific linked locus and also a polymorphic X locus with an X-linked pattern of inheritance. A first screening in the X homologous locus allowed the identification of five different alleles. Allele frequencies were explored in different population groups for both the Y locus and the homologous locus in the X chromosome showing a similar allele distribution pattern in the X and Y homologous loci. An alternative reverse primer was designed to amplify the Y-chromosome specific STR in order to improve the specificity and applicability of this system to forensic genetics. Comparative results of the amplification with the new and the previously described primers proved that with this new primer there is a substantial increase in the specificity of the amplification. Moreover, a smaller fragment is amplified with a size out of the range of the alleles of the other Y-STRs usually used in forensic applications, therefore simplifying its inclusion in multiplex systems. 相似文献
185.
Analysis of eight STR loci in two Hungarian populations 总被引:1,自引:0,他引:1
Egyed B Füredi S Angyal M Boutrand L Vandenberghe A Woller J Pádár Z 《Forensic science international》2000,113(1-3):25-27
A collection of eight STR loci (D3S1358, FGA, D8S1179, D21S11, D18S51, D5S818, D13S317, D7S820) was used to generate allele frequency databases for two Hungarian population samples, Caucasians from the Budapest area and Romanies from Baranya county. During the analysis two intermediate sized alleles and a sequence variant allele were observed at the D7S820 locus. All three types of allelic variants were found to have modification (deletion, insertion, transversion) in the same block of a (T)(9) stretch located within the 3' flanking region of each allele, which may indicate a possible higher mutation rate of this (T)(9) block. For the loci D3S1358 and D7S820 the Romany population database showed departures from Hardy-Weinberg equilibrium. The forensic efficiency values for the Romany population were slightly different from those found in the Hungarian Caucasian population. Comparing the allele frequency values by G-statistic, calculating the F(st) indices and with the pairwise comparisons of inter-population variance, the two Hungarian populations could be distinguished using data of the eight STR loci. 相似文献
186.
Chattopadhyay PK Cleef S Duelmer M Henke L Henke J 《Forensic science international》2000,113(1-3):29-32
This study provides Jat Sikhs population data in North India for nine short tandem repeat (STR) loci. 相似文献
187.
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
188.
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
189.
190.