全文获取类型
收费全文 | 528篇 |
免费 | 8篇 |
专业分类
各国政治 | 18篇 |
工人农民 | 19篇 |
世界政治 | 24篇 |
外交国际关系 | 33篇 |
法律 | 354篇 |
中国政治 | 4篇 |
政治理论 | 83篇 |
综合类 | 1篇 |
出版年
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 10篇 |
2018年 | 16篇 |
2017年 | 11篇 |
2016年 | 11篇 |
2015年 | 5篇 |
2014年 | 12篇 |
2013年 | 42篇 |
2012年 | 18篇 |
2011年 | 15篇 |
2010年 | 10篇 |
2009年 | 12篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 16篇 |
2005年 | 14篇 |
2004年 | 24篇 |
2003年 | 13篇 |
2002年 | 5篇 |
2001年 | 47篇 |
2000年 | 25篇 |
1999年 | 40篇 |
1998年 | 15篇 |
1997年 | 3篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 8篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 15篇 |
1989年 | 6篇 |
1988年 | 9篇 |
1987年 | 3篇 |
1986年 | 6篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1976年 | 5篇 |
1973年 | 3篇 |
1972年 | 3篇 |
1967年 | 5篇 |
1966年 | 3篇 |
1965年 | 3篇 |
排序方式: 共有536条查询结果,搜索用时 31 毫秒
121.
122.
Zúñiga J Ilzarbe M Acunha-Alonzo V Rosetti F Herbert Z Romero V Almeciga I Clavijo O Stern JN Granados J Fridkis-Hareli M Morrison P Azocar J Yunis EJ 《Forensic science international》2006,164(2-3):266-270
Allelic frequencies of 15 short tandem repeats (STR) markers (CSF1PO, FGA, THO1, TPOX, VWA, D3S11358, D5S818, D7S820, D8S1179, D13S317, D16S539, D18S51, D21S11, D19S433 and D2S1338) were determined using the AmpFl STR Identifiler PCR Amplification Kit in Puerto Rican American individuals (N=205) from Massachusetts. The FGA, D18S51 and D2S1338 loci had a high power of discrimination (PD) with values of 0.967, 0.965 and 0.961, respectively. Significant deviations from the Hardy-Weinberg (HW) equilibrium were not detected. An important genetic contribution of Caucasian European (76.4%) was detected in Puerto Rican Americans. However, comparative analysis between Puerto Rican American and other neighboring populations from United States mainly with African and Caucasian Americans, revealed significant differences in the distribution of STR markers. Our results are important for future comparative genetic studies of different American ethnic groups, in particular a cultural group called Hispanic-Americans and should be helpful for forensic and paternity testing. 相似文献
123.
A new method of age estimation based on the changes in human non-collagenous proteins from dentin 总被引:1,自引:0,他引:1
The new method exploits the characteristic of staphylococcal protease V8, which specifically splits peptide bonds where l-glutamic or l-aspartic acid participate. Those peptide bonds where d-aspartic acid is present remain unsplit because of the stereospecifity of enzymes. In accordance with expectations, fewer peptide bonds are split by this protease at more advanced ages and larger peptide fragments are thus formed due to the higher content of d-amino acid residues in the proteins of older people. The samples of acid-extracted non-collagenous proteins from dentin were separated using high performance liquid chromatography after enzymatic hydrolysis. A peak with a retention time of 45.3 min was chosen and his enlarging area showed a linear correlation with increasing age. Although the linear correlation with age was proved, the scattering of values decreases the usefulness of the proposed method for age estimation. 相似文献
124.
Bligh-Glover WZ Miller FP Balraj EK 《The American journal of forensic medicine and pathology》2004,25(3):255-258
Two cases of suicidal electrocution are presented: one using a household lamp, the other using a homemade electrocution machine. The mechanisms of death and the histologic changes in electrocution are discussed. 相似文献
125.
126.
127.
An unconscious 8 weeks old infant was admitted to hospital and found to have bilateral, subdural and retinal haemorrhages. He died the following day. The explanation for the subdural haemorrhage put forward by his carers was that the infant had been in a baby-rocker and that the carers had seen the rocker being rocked vigorously by their 14 months old daughter on two separate occasions. This paper describes the biomechanics of an infant model in the particular baby-rocker used and determines the maximum forces generated, comparing them with the 'forces' thought to be compatible with the causation of subdural haemorrhage. 相似文献
128.
129.
130.
度冷丁滥用者毛发分段分析及其结果评价 总被引:1,自引:0,他引:1
以度冷丁滥用者为研究对象,在度冷丁滥用者毛发中检出度冷丁及代谢物去甲度冷丁、N一羟甲基度冷丁和N-乙酰度冷丁。60例度冷丁滥用者头发中度冷丁和去甲度冷丁的含量分别为103±130ng/mg和117±143ng/mg。度冷丁稳定地存在于头发中,检出时限至少为药后20个月,而去甲度冷丁则随着离头发根距离的增加而降低。头发分段分析揭示度冷丁在毛干中的分布和滥用史、剂量和含量存在相关性。 相似文献