DNA Analysis of Natural Fiber Rope*

Abstract: When rope is found at a crime scene, the type of fiber is currently identified through its microscopic characteristics. However, these characteristics may not always unambiguously distinguish some types of rope from others. If rope samples contain cells from the plants of origin, then DNA analysis may prove to be a better way to identify the type of rope obtained from a crime scene. The objective of this project was to develop techniques of DNA analysis that can be used to differentiate between ropes made from Cannabis sativa L. (hemp), Agave sisalana Perrine (sisal), Musa textilis Née (abaca, “Manila hemp”), Linum usitatissimum L. (flax), and Corchorus olitorus L. (jute). The procedures included extracting the DNA from the rope, performing polymerase chain reaction (PCR) using the extracted DNA as a template, and analyzing the DNA products. A primer pair for PCR, chosen from within a chloroplast gene for the large subunit of ribulose bisphosphate carboxylase/oxygenase, was designed to be specific for plant DNA and complementary to the genes from all five plants. The resulting PCR fragments were approximately 771 base pairs long. The PCR fragments, distinguished through base sequence analysis or restriction enzyme analysis, could be used to identify the five different rope types. The procedure provides a useful addition to visual methods of comparing rope samples.     

Introduction: The Future of British Political History

Politics and history are closely intertwined and historians play a vital role in British public life. Yet, British political history, which has a critical contribution to make for understanding British politics today, faces two urgent challenges. First, academic history has retreated from subjects that remain hugely popular in media and trade publishing and of interest to social scientists, such as the histories of political institutions and formal power structures. Second, political history is disconnected from innovative trends in the wider historiography of modern Britain. Combined, these issues leave political historians in an ambiguous position in relation to the wider field, to other academic disciplines and to contemporary political debates. After discussing these challenges, this introduction surveys this special issue, which reflects on what (if anything) is distinctive about political history as practised today, and what its contribution to historiography, social science and public life should be. It ends by posing key questions for historians of all methodological stripes who investigate Britain's political past.     

Does victimization reduce self-control? A longitudinal analysis

Purpose

To examine the effect of victimization on self-control.

Method

Five waves of data from the GREAT survey are analyzed; the effect of prior victimization on subsequent self-control is estimated using the dynamic panel generalized-method of moments.

Results

Victimization reduces subsequent self-control in the near term.

Conclusions

The findings point to another source of low self-control, help to explain why prior victimization is linked to subsequent victimization, and provide support for general strain theory - which predicts that strains such as victimization will reduce self-control.     

Tool mark striations in pig skin produced by stabs from a serrated blade

Stab wounds produced by serrated blades are generally indistinguishable from stab wounds produced by non-serrated blades, except when visible tool mark striations are left on severed cartilage. Using a pig-skin experimental model, we explored the possibility that similar striations may be left in skin. Stabs into pig skin were made using a straight spine coarsely serrated blade (121), a drop point finely serrated blade (20), a clip point irregular coarsely serrated blade (20), a drop point coarsely serrated blade (15), and as controls 2 non-serrated blades (40). Tool mark striations could be seen on the skin wall of the stab canal in all stabs made using serrated blades but in none with non-serrated blades.The striation pattern, reflecting the class characteristics of the serrated blade, was the same as that described in cartilage but less well defined. Fixation of the specimen with Carnoy's solution best preserved visible striations, and fixation with formaldehyde after staining with 5% Neutral Red was also satisfactory. Casting with vinyl polysiloxane dental impression material greatly facilitated photo-documentation. Applying the technique to homicidal stabbings may help identify stab wounds produced with serrated blades.     

Apology,Recognition, and Reconciliation

The article examines the role of apology in a process of reconciling with historic injustice. As with so many other facets of the politics of reconciliation, official apologies are controversial, at times strenuously resisted, and their purpose and significance not always well understood. The article, therefore, seeks to articulate the key moral and practical resources that official apologies can bring to bear in a process of national reconciliation and to defend these symbolic acts against some of the more influential criticisms from the skeptics. The analysis is developed in relation to apologies offered in the context of state-indigenous reconciliation processes in the Americas, Australasia, and other regions of the globe.     

志愿者动机之社会和文化起源——六国大学生调查情况比较

虽然有关志愿者活动的参与以及志愿者动机(Motivationsto Volunteers,以下简称MTV)的研究已经受到许多国家(尤其是美国)的持续关注,但是,从文化和政治背景来解析的研究却鲜见。本文对志愿者活动的社会起源论和信息传递论这两种理论进行了比较,阐述了不同国家志愿者动机的差异,着重分析了来自6个国家具有不同文化背景的5,794名学生各自的反应。所得到的结果有力地支持了信息传递论,与此同时却淡化了社会起源论。文章得出结论:参与志愿者活动系个人的决定,更多地受个人影响,当然某种程度上也受到巨大的社会力量的影响。     

Regulating the Influence Game in Australia

In this research note we describe the introduction and evolution of Australia's approach to regulating lobbyists. We examine how the lobbying regulations in place across Australia today compare with each other, as well as with lobbying regulations in some other countries around the world. The regulations in each Australian jurisdiction are classified according to their characteristics, providing insights into their commonalities and differences.     

An apparently jawless cadaver: a case of post-mortem slippage

Passer-by witnesses reported a human cadaver in woodland associated with an agricultural college to police in Northern Ireland. The cadaver comprised reasonably preserved feet, legs and pelvis, with poorly preserved arms and torso, lying with the torso down-slope abutting a fallen tree. A search of the area around the torso, and for some 20m around, failed to find the cranium and mandible. The mandible was found, embedded inside the chest cavity. The cranium was found some 30m away. The victim was later identified as a 24-year old drug addict who had absconded from a local hospital. Mapping of the area led us to speculate that he had tripped and fallen down-slope: other reasons for the body location were also considered. After death, the cadaver had further slipped down-slope forcing the mandible into the chest cavity: slippage of human remains is well-known in forensic and archaeological literature but not well documented. Knowledge of this process of cadaver 'slip' may save wasted police resources in future similar environments where the mandible, and possible other nearby bones appear missing yet are inside the body.     

TREAD: A Promising Change-Target for Partner Abuse Prevention with Adolescents

There is consensus in the partner abuse prevention education literature that a skills-focus is needed. However, appropriate instruments for evaluating the effectiveness of skills-focused programs do not exist. Against this background, and based on the dyadic slippery slope model of partner abuse, the Tendency to Resist or End Abusive Dynamics (TREAD) scale was developed. TREAD is defined as one’s tendency to respond assertively or protectively in situations involving warning-sign (potentially hurtful or controlling) behaviors by a partner. The scale’s development drew on the input of three Australian samples: mixed-gender adolescent focus groups, 426 young female respondents to an online survey, and 152 adolescent girls participating in a school-based program trial. When tested with the 152 adolescent girls, the TREAD scale had acceptable internal consistency and high inter-rater reliability. Principal components analysis identified three interrelated TREAD subscales (i.e., Conflict-Retaliation TREAD, Denigration TREAD, and Dominance-Possessiveness TREAD) all of which were negatively associated with frequency of exposure to warning-sign behaviors. This paper charts the preliminary development of the TREAD scale, presenting evidence supporting its validity as a change-target for partner abuse prevention education with adolescent girls and, potentially, boys.