Classification of premium and regular gasoline by gas chromatography/mass spectrometry,principal component analysis and artificial neural networks

Detection and correct classification of gasoline is important for both arson and fuel spill investigation. Principal component analysis (PCA) was used to classify premium and regular gasolines from gas chromatography-mass spectrometry (GC-MS) spectral data obtained from gasoline sold in Canada over one calendar year. Depending upon the dataset used for training and tests, around 80-93% of the samples were correctly classified as either premium or regular gasoline using the Mahalanobis distances calculated from the principal components scores. Only 48-62% of the samples were correctly classified when the premium and regular gasoline samples were divided further into their winter/summer sub-groups. Artificial neural networks (ANNs) were trained to recognise premium and regular gasolines from the same GC-MS data. The best-performing ANN correctly identified all samples as either a premium or regular grade. Approximately 97% of the premium and regular samples were correctly classified according to their winter or summer sub-group.     

Court strikes out latest action in contaminated blood litigation

On 24 June 2003, the Federal Court of Canada--Trial Division struck out an action by three hemophiliacs infected with HIV through contaminated blood products. The case arose out of the destruction of records by members of Canadian Blood Committee (CBC) in 1989. The defendants were the government of Canada and three government of Canada employees who worked at the CBC in 1989 and were alleged to have been involved in the destruction of records.     

A protocol for the forensic analysis of condom and personal lubricants found in sexual assault cases.

In sexual assault cases, lubricant trace evidence may supplement biological evidence, or may be the primary physical evidence where biological evidence is unavailable. This study considered a total of 50 lubricants from condoms and personal lubricant products available in Australia. Differentiation of the samples was attempted using fluorescence examination, Fourier transform infrared spectroscopy (DRIFTS), gas chromatography-mass spectrometry, liquid chromatography-tandem mass spectrometry, and pyrolysis gas chromatography-mass spectrometry. Eleven of the samples were uniquely identified by the analysis scheme, while the remainder of the samples were separated into nine groups. As a result of this study, a recommended protocol for the detection and analysis of an "unknown" biological swab was produced.     

Further Tests of the Women and Peace Hypothesis: Evidence from Cross-National Survey Research in the Middle East

This research report replicates, extends, and adds a longitudinal dimension to a recently published analysis focusing on the relationship between sex and attitudes toward international conflict, and specifically on the hypothesis that women are more peace-oriented than men. The study being replicated utilized public opinion data from Israel, Egypt, Palestine, and Kuwait. The present report extends the analysis, employing one additional data set from Israel, two additional data sets from Palestine, and new data sets from Jordan and Lebanon. In contrast to findings from studies conducted in the United States and Europe, none of the nine Middle Eastern data sets yields a statistically significant relationship between sex and attitudes toward international conflict. The article considers possible reasons for the difference between findings from the Middle East and those based on research in the West. Emphasizing the notion of salience, it hypothesizes that characteristics of the conflict about which attitudes are held may be more important than country or regional attributes in determining the applicability of the women and peace hypothesis.     

Intractable Policy Failure: The Case of Bovine TB and Badgers

The failure to eliminate bovine TB from the English and Welsh cattle herd represents a long-term intractable policy failure. Cattle-to-cattle transmission of the disease has been underemphasised in the debate compared with transmission from badgers despite a contested evidence base. Archival evidence shows that mythical constructions of the badger have shaped the policy debate. Relevant evidence was incomplete and contested; alternative framings of the policy problem were polarised and difficult to reconcile; and this rendered normal techniques of stakeholder management through co-option and mediation of little assistance.     

Operationalising bottom-up learning in international NGOs: Barriers and alternatives

This article proposes bottom-up learning as a normative framework for international NGOs. It explores the common but often unacknowledged disparity between organisational values and mission versus actual practice. The first section of the paper raises the question of organisational learning disorders followed by an exploration of learning organisations and bottom-up learning in particular. A section briefly summarising positive developments in the field is followed by discussions of organisational barriers and possible mitigation techniques. The paper closes with a challenge for international NGOs to take a closer look at their learning capabilities with a view to improving service to communities in need.     

Characterization of human DNA in environmental samples

Environmental samples from indoor surfaces can be confounded by dust, which is composed largely of human skin cells and has been documented to contain roughly tens of micrograms of total DNA per gram of dust. This study complements previous published work by providing estimates of the quantity of amplifiable human DNA found in environmental samples from a typical indoor environment, categorized by the intensity of human traffic and visible quantity of dust. Dust was collected by surface swabbing standard 576 cm² areas in eight locations, and evaluated for total DNA quantity, presence of human DNA (mitochondrial and nuclear loci using conventional PCR), quantity of human nuclear DNA using quantitative PCR, and STR analysis. The total DNA content of 36 dust samples ranged from 9 to 28 ng/cm², and contained 0.2–1.1 pg/cm² of human DNA. Overall, human DNA was detected in 97% of 36 dust samples and 61% of samples yielded allele distributions of varying degrees of complexity when subjected to STR analysis. The implications of this study are twofold. First, the presence of dust in evidence can be a significant contamination source in forensic investigations because the human DNA component is of sufficient quality and quantity to produce allele calls in STR analysis. This can be effectively managed by implementing stringent protocols for collection and analysis of potential biological samples. A second implication is the use of dust as a source of evidence for identification of inhabitants within a defined location. In the latter case, a number of additional studies would be necessary to identify relevant pretreatments for environmental dust samples and to develop the necessary deconvolution techniques to separate the composite genotypes obtained.     

Is there a long‐run relationship between population growth and living standards? The case of India

This note examines the existence of a long‐run, cointegrating relationship between population and per capita GDP in India for 1950–93. Unit root tests show that per capita GDP is integrated of order one while population is integrated of order zero; further, estimation of the bi‐variate relationship using the cointegration procedure of Johansen shows that no long‐run relationship exists. Thus, population growth neither causes per capita income growth nor is caused by it. A corollary is that population growth neither stimulates per capita income growth nor detracts from it.