生物材料中溴氰菊酯的内标监控高效液相色谱分析方法研究

本文经实验研究建立了以反式二氯苯醚酯为监控内标反相高效液相色谱检测生物材料中溴氰菊酯的方法。通过空白兔肝添加试验验证了方法的回收率,工作曲线线性及数份样品的重视性。结果满意。并通过染毒动物试验验证了方法的实用性。     

Ultraviolet radiation and its role in wound pattern documentation.

The history of ultraviolet illumination in photography is discussed. Particular attention is devoted to the forensic aspects of ultraviolet photography as it relates to patterned injury on human skin. The authors discuss the theory underlying ultraviolet illumination of wounds on skin as well as the equipment required for this type of imaging.     

Formal Procedures, Informal Processes, Accountability, and Responsiveness in Bureaucratic Policy Making: An Institutional Policy Analysis

This study examines the role of public notice and comment in the development of 42 rules. These procedures can provide useful information to policy makers about the preferences of those who stand to be affected by agency actions. More importantly, they serve as cues for the accommodation of interests and the resolution of conflict through processes that are grounded in agencies' accountability to political officials. Yet, an examination of the interrelationship between formal, procedural constraints and the informal processes surrounding them reveals that the effects of notice and comment in promoting bureaucratic responsiveness are limited in ways that have received little systematic analysis. A consideration of the tension between the instrumental goal of procedural accountability and the political tasks that often dominate bureaucratic policy making suggests that it is desirable to return to the original use of notice and comment as a device for exposing agencies to the views of affected interests.     

Optimal compensating wages for military personnel

The current U.S. military pay structure offers inequitable and inefficient wages across locations. Military personnel are paid less competitive wages in high‐cost and/or low‐amenity locations compared to low‐cost and/or high‐amenity locations. This pay system results in unequal reenlistment rates across locations, which leads to production inefficiencies caused by short‐term manning shortages in highturnover locations. Wages set according to local civilian compensating wage differentials would result in a more stabilized force (across locations) by equalizing the opportunity cost of staying in the military at each location. Additionally, more personnel would volunteer to serve in the high‐cost and/or low‐amenity locations because wages would be more commensurate with local costs and amenities. This would result in fewer non‐volunteer assignments to undesirable locations and a minimized opportunity cost for personnel serving at each location. Reenlistment simulations on first‐term Air Force personnel show that the proposed wage structure would better equalize reenlistment rates across locations. This proposal could be implemented at no cost to the government by cutting wages in low‐cost and/or high‐amenity locations. A gradual implementation in which such wages are frozen or increased slowly may be more politically palatable. © 2005 by the Association for Public Policy Analysis and Management     

The spectroscopic detection of exogenous material in fingerprints after development with powders and recovery with adhesive lifters

The application of powders to fingerprints has long been established as an effective and reliable method for developing latent fingerprints. The powders adhere to the ridge pattern of the fingerprint only, thus allowing the image to be visualised. Fingerprints developed in situ at a crime scene routinely undergo lifting with specialist tapes to facilitate subsequent laboratory analysis. As with all recovered evidence these samples would be stored in evidence bags to allow secure transit from the scene to the laboratory and also to preserve the chain of evidence. In this paper, the application of Raman spectroscopy for the analysis of exogenous material in latent fingerprints is reported for contaminated fingerprints that had been treated with powders and also subsequently lifted with adhesive tapes. A selection of over the counter (OTC) analgesics were used as samples for the analysis and contaminated fingerprints were deposited on clean glass slides. The application of aluminium or iron based powders to contaminated fingerprints did not interfere with the Raman spectra obtained for the contaminants. In most cases background fluorescence attributed to the sebaceous content of the latent fingerprint was reduced by the application of the powder thus reducing spectral interference. Contaminated fingerprints developed with powders and then lifted with lifting tapes were also examined. The combination of these two techniques did not interfere with the successful analysis of exogenous contaminants by Raman spectroscopy. The lifting process was repeated using hinge lifters. As the hinge lifters exhibited strong Raman bands the spectroscopic analysis was more complex and an increase in the number of exposures to the detector allowed for improved clarification. Raman spectra of developed and lifted fingerprints recorded through evidence bags were obtained and it was found that the detection process was not compromised in any way. Although the application of powders did not interfere with the detection process the time taken to locate the contaminant was increased due to the physical presence of more material within the fingerprint. The presence of interfering Raman bands from lifting tapes is another potential complication. This, however, could be removed by spectral subtraction or by the choice of lifting tapes that have only weak Raman bands.     

The Stable Isotope Ratios of Marijuana. II. Strontium Isotopes Relate to Geographic Origin

Abstract:  Effectively addressing marijuana trade is aided by understanding marijuana geographic sources. We analyzed the ⁸⁷Sr/⁸⁶Sr of marijuana samples grown in 79 counties across the United States to determine if a primary geologic signal is retained in marijuana, which could therefore be useful for geographic sourcing. The marijuana results were compared with modeled bedrock ⁸⁷Sr/⁸⁶Sr values based on ⁸⁷Rb decay rates and a generalized geologic map of the U.S.A. A significant correlation was observed between marijuana ⁸⁷Sr/⁸⁶Sr and modeled bedrock ⁸⁷Sr/⁸⁶Sr. Although values clustered near the 1:1 relationship, there was a predominance of positive anomalies, perhaps attributable to carbonate bedrock. A small number of negative anomalies were also observed, which were generally associated with granitic bedrocks. These results suggest that strontium isotopes in marijuana record the geographic origins of marijuana, and that refinement of the base strontium map (or strontium isoscape) and improved understanding of other strontium sources would be productive.