基于纤维二次转移确定纤维屑作为示踪物质的探讨

目的 考察纤维屑在涉及二次转移案件中作为示踪物质的适用性.方法 根据一个实际案例展开,在该案中,犯罪嫌疑人涉嫌多起入室盗窃案.纤维开始分散于嫌疑人所用车辆,后被嫌疑人“携带”并分散到犯罪现场,最终这些纤维在勘查过程中被收集.设计完善了一个可用于散布纤维的便携式装置,并完成了一系列二次转移的相关实验.结果 设计的装置可在短时间均相的散布纤维,单次接触不能全部转移第一表面的纤维碎屑.只有1-15％的纤维会转移到代表犯罪现场的第三表面.实际转移的纤维数与包括比如表面的材质在内的各种因素都有关系.结论 在所选参数范围内,相对大量的纤维有可能转移到犯罪现场并在现场勘查过程中被提取.     

Studying the Arabs: Myths and metaphors

The relationship between knowledge and power is examined in this article in terms of the social science literature base on Arab countries. It is argued that knowledge imposes normative constraints on the exercise of power, and the exercise of power is dependent on the lack of knowledge. This is examined in terms of the knowledge base on Iraq and Palestine, the two countries in the Arab world most decimated in the post-World War II era by the exercise of external power politics. The study is organized in three phases: (1) delimiting the population of scholarly literature in the social sciences on the Middle East by country; (2) drawing representative samples of scholarly literature on Iraq and Palestine from this population; and (3) content analysis of the samples. Jacqueline S. Ismael is a professor of social work at The University of Calgary. She has published a number of articles and monographs on social change in the Middle East, as well as several works on Canadian social policy. She is co-author with Tareq Y. Ismael ofThe People’s Democratic Republic of Yemen: The Politics of Socialist Transformation (1986),Government and Politics in Islam (1986),Politics and Government in the Middle East andNorth Africa (1991), andThe Gulf War and the New World Order (1994). Her most recent work isKuwait: Dependency and Class in a Rentier State (1993). Tareq Y. Ismael is a professor of political science at The University of Calgary. He has written extensively on Middle East politics, the international relations of the Middle East, and ideology in the Arab world. His recent publications includeInternational Relations of the Contemporary Middle East (1986),Middle East Studies: International Perspectives on the State of the Art (1990),The Communist Movement in Egypt (1990),Politics and Government in the Middle East and North Africa (1991), andThe Gulf War and the New World Order (1994).     

Hyperuricemia in rats during acute carbon monoxide poisoning

The effect of carbon monoxide (CO) inhalation on plasma levels of uric acid and hypoxanthine in rats was investigated. Exposure to 3% CO caused respiratory arrest within about 2 minutes. The plasma uric acid level of CO-treated rats increased to 157% above that of ether-treated rats. When rats were exposed to 1% or 0.8% CO, the exposure periods until the onset of respiratory arrest were prolonged, and plasma uric acid levels at respiratory arrest were further elevated. Plasma uric acid levels at respiratory arrest increased with prolongation of the exposure periods. Under our experimental conditions, hypoxanthine or xanthine was not detected in plasma of CO-treated rats. These results are discussed in relation to the hyperuricemia in hemorrhagic shock or hypoxemia: CO-induced hyperuricemia can be attributed to the stimulated degradation of adenine nucleotides under tissue anoxia, and thus could be an excellent parameter of tissue anoxia.     

Determination of age from the sternal rib in white males: a test of the phase method

The effectiveness of a given age determination technique can better be assessed by testing the standards on unknown specimens. A test of this nature was carried out to evaluate the authors' previously published phase method for age estimation from the sternal extremity of the rib. A sample of 15 test ribs was judged by 25 physical and forensic anthropologists with varying levels of education and experience. The judges were asked to match the rib to the phase it most closely resembled by comparing it with the photographs from the original study. The results indicated that interobserver error based on experience was minimal, and nearly all of the participants averaged within one phase of the ideal. Variation appeared to be greater among the ribs than among the judges, yet no consistent association could be made between this variation and factors such as cause of death, antemortem medical history, drug or alcohol abuse, and occupation.     

Immunoassay for methamphetamine with a new antibody

p- and o-Aminomethamphetamine were synthesized as haptens to be coupled with carrier protein at the benzene ring of methamphetamine. Immunogens were prepared by the glutaraldehyde method or the MBS (N-(m-maleimidobenzoyloxy)succinimide) type cross-linking reagent method. In particular, immunization with p-aminomethamphetamine-bovine serum albumin (BSA) conjugate prepared by the glutaraldehyde method gave an anti-methamphetamine antiserum having a low cross-reactivity with methylephedrine. With the antiserum, three kinds of immunoassays for methamphetamine were established. An enzyme immunoassay (EIA) and an enzyme-linked immunosorbent assay (ELISA) were developed with alkaline phosphatase (ALP) as a label enzyme. The amount of antibody bound ALP conjugate was determined by its activity in dephosphorylating p-nitrophenyl phosphate in EIA and nicotinamide adenine dinucleotide phosphate (NADP+) in ELISA. The range of methamphetamine measurable by ELISA was 0.025-0.5 ng/well and its sensitivity was superior to that of EIA (0.3-300 ng/tube). A latex agglutination inhibition reaction test (LAIRT) was also developed for the mass screening method of urine samples. The sensitivity of this method for methamphetamine was 0.1 micrograms/ml urine.     

Storage of blood for methemoglobin determination: comparison of storage with a cryoprotectant at -30 degrees C and without any additions at -80 degrees C or -196 degrees C

Changes in methemoglobin (Met-Hb) concentrations during storage of whole blood or mixtures of blood and a cryoprotectant at refrigerated or various freezing temperatures were examined using blood samples from nitrite-administered rats and from autopsy cadavers. When whole blood was stored at 3 degrees C, Met-Hb reduction was observed in blood samples from nitrite-administered rats and in the blood from a victim poisoned by a weed killer containing some oxidant. When samples were stored at -30 degrees C, Met-Hb formation by autoxidation was inevitably observed in blood samples stored as whole blood, whereas addition of a cryoprotectant to whole blood could prevent Met-Hb formation in all the blood samples. When whole blood was stored at -80 degrees C or -196 degrees C, Met-Hb concentrations were practically stable until at least 30 days regardless of the initial values except in the control rat blood samples stored at -80 degrees C which showed slight formation of Met-Hb. From the results obtained, both the storage with a cryoprotectant at -30 degrees C and that without any additions at -80 degrees C or -196 degrees C proved to be suitable for long-term storage of blood samples from autopsy cadavers for Met-Hb determination.