The Derivation and Reconstruction of the Gamma Variate Function for Tracer Dilution Curves

Cerebral blood flow and perfusion can be estimated using tracer dilution experiments. Accurate estimation of blood flow parameters is a crucial part of medical imaging for effective diagnosis and treatment. This study explores two themes: (i) the derivation of the gamma variate function as a response tracer infusion and (ii) the estimation of impulse and residue functions from tracer dilution curves parameters via the least squares method

Reducing Cost and Contention of P2P Live Streaming through Locality and Piece Selection

The use of locality within peer-to-peer (P2P) networks is ensuring the construction of overlay networks that are both economically viable for network operators and scalable. However, the underlying protocols on which traditional P2P overlays are based are rapidly having to evolve in order to better support more time sensitive, real-time video delivery systems. This shift places greater demand on locality mechanisms to ensure the correct balance between bandwidth savings and successful timely playback. In this paper, we investigate the impact of peer locality within live streaming P2P systems and consider the pertinent challenges when designing locality based algorithms to support efficient P2P live streaming services. Based on our findings we propose an algorithm for supporting locality and harmonised play points in a live streaming P2P system. We present our results and in-depth analysis of its operation though a series of simulations which measure bandwidth consumption at network egress points, failure rates and each peer’s play point relative to the live stream

Geophagia: A cultural-nutrition health-seeking behaviour with no redeeming psycho-social qualities

Aim: We investigated if Geophagia is restricted to only pregnant and lactating women in Ghana. We also investigated if the key driver of Geophagia is poverty and other socio-cultural factors. Methods: This analysis was part of a broader national study of resilience among thepopulation of Ghana (N=2,000). Regional comparisons were made possible due to the stratified and random selection of representations that were similar in characteristics such as being urban or rural, ethnicity, religion and gender. Results: It was found that Geophagia was present among both females and males and was not restricted to pregnant and lactating women. Geophagia was not driven by poverty or the lack of formal education or the presence of gainful employment. Geophagia was practiced by both urban and rural residents irrespective of religious proclivities and devotion. The assertion that Geophagia was an instinctive primordial response to gastro-intestinal disturbances was not sustained by the data in this study, although the literature review suggested such in calves and lambs. Conclusion: In order to address the potential health threats posed by Geophagia, the key cultural drivers need to be studied and understood. We also need to appreciate the shocks and stresses that create such desires. It is not a case of mental illness and it cannot be concluded that Geophagia is driven by a psychiatric disorder. This paper would be disseminated to inform policy in Ghana and beyond

FACILE ENANTIOSELECTIVE PALLADIUM CATALYSED TRANSFER HYDROGENATION OF α-METHYLCINNAMIC ACID IN THE PRESENCE OF OPTICAL PURE ORGANIC ACIDS

An efficient and enantioselective method for catalytic transfer hydrogenation of the C=C double bond of α-methylcinnamic acid with the aid of chiral organic acids as the hydrogen donors and palladium(II) chloride as the catalyst is reported. Enantiomeric excess was assayed using optical rotation measurements. The best stereoselectivity was achieved when L-(+)-tartaric acid was used as the hydrogen donor and acetonitrile as the solvent. KEYWORDS: Enantioselective, Chiral, α-Methylcinnamic acid, Transfer hydrogenation, Palladium(II) chloride Bull. Chem. Soc. Ethiop. 2007, 21(3), 457-460

Prevention of Child Sexual Abuse in South Africa: Assessing the Role of Parents, Community Leaders, Educators, and Social Workers

Child sexual abuse is a global problem and is prevalent in South Africa. Child sexual abuse significantly harms the victims. This study looked at child sexual abuse prevention, focusing on the community, school system, and social workers. A mixed methods research method was used. Data were collected from 115 questionnaire respondents, of which 15 in-depth interview participants were selected. The sample was selected using purposive sampling and stratified random sampling techniques. Low reporting of incidents is hindering the effective response to child sexual abuse. The study revealed the significant role parents and community members could play in preventing child sexual abuse. The results also show that the school system plays a crucial role in educating children about inappropriate touches, discussing prevention skills with children, and encouraging children to report incidents of child sexual abuse. The study found that limited training for educators was a significant obstacle in the school system. Social workers play their part through advocacy and awareness campaigns and assisting the police during investigations. The study recommends a multi-sectorial approach to encourage reporting of child sexual abuse cases and training educators on responding to child sexual abuse

Database management and analysis of fisheries in Illinois: Final report, 1 March 1999-28 February 2002

Issued May 2002; F-69-RReport issued on: May 200

PROBLEMS ASSOCIATED WITH EFFECTIVE PROVISION OF INFORMATION ON AGRICULTURAL INSURANCE TO RURAL FARMERS FOR CLIMATE CHANGE ADAPTATION.

Information provision and adult literacy on Agricultural insurance is very vital in facilitating rural farmer’s change of behavior and adjustment to climate change adaptation. Majority of rural farmers in Enugu State, Nigeria is mostly illiterate, found in rural communities and are mainly dependent on rain-fed agriculture and with low level of educational development and thus require agricultural information and adult literacy on Agricultural insurance to be able to adapt to the never-ending climate change. However, there are problems facing Information provision and adult literacy on Agricultural insurance to rural farmers for climate change adaptation. This study therefore identified some of the constraints to information agents and rural farmers in Enugu State, Nigeria. A multistage sampling procedure was used in selecting five hundred and ten respondents for the study. Data collected with questionnaire and focus group discussion were analyzed using descriptive statistics. The data gathered from the focus group discussion were also analyzed qualitatively using summaries and consensus of respondents’ views. Findings from the study show that the problems include lack of rural infrastructure, illiteracy, lack of rural information centers, lack of trained extension agents etc. The study recommended that weather forecast information should be published and made available to the farmers through agricultural extension agents. Rural farmers should be educated on different insurance plans to enable them adapt easily to climate change etc

A Late Born White-tailed Deer, Odocoileus virginianus, Fawn in Southcentral Wisconsin

Published reports of peak breeding and parturition dates for White-tailed Deer (Odocoileus virginianus) indicate that deer in northern regions typically breed during November and give birth during late May and early June. However, we report a late-born White-tailed Deer fawn killed by a vehicle between 12-13 March 2007 in south central Wisconsin. Morphology measurements and body weight indicated the individual was 63-76 days old, was born between 26 December 2006 and 8 January 2007, and was conceived between 14-27 June 2006. To our knowledge, this observation represents the latest documented breeding activity in northern deer populations

Laser writing of individual atomic defects in a crystal with near-unity yield

Atomic defects in wide band gap materials show great promise for development of a new generation of quantum information technologies, but have been hampered by the inability to produce and engineer the defects in a controlled way. The nitrogen-vacancy (NV) color center in diamond is one of the foremost candidates, with single defects allowing optical addressing of electron spin and nuclear spin degrees of freedom with potential for applications in advanced sensing and computing. Here we demonstrate a method for the deterministic writing of individual NV centers at selected locations with high positioning accuracy using laser processing with online fluorescence feedback. This method provides a new tool for the fabrication of engineered materials and devices for quantum technologies and offers insight into the diffusion dynamics of point defects in solids.Comment: 16 pages, 8 figure

BETWEEN THE BIOACTIVE EXTRACTS OF EDIBLE MUSHROOMS AND PHARMACOLOGICALLY IMPORTANT NANOPARTICLES: NEED FOR THE INVESTIGATION OF A SYNERGISTIC COMBINATION - A MINI REVIEW

ABSTRACTThe pharmacological potential of bioactive compounds extracted from mushrooms has been studied to a reasonable level. In the same vein, thebioactivity of nanoparticles has also been investigated and reported to be of potential pharmacological benefit. No doubt, there is a reasonableamount of claims regarding the vast activity of the mushroom extracts and nanoparticles on the tested cell lines and microorganisms. In this paper,a review of the recent application of bioactive compounds extracted from two edible mushrooms (Coprinus comatus and Lactarius deliciosus), aswell as some of the recently reported studies on some nanoparticles of pharmacological potentials, was carried out. In order to check for synergy inthe bioactivity of the mushroom extracts when co-administered with nanoparticles, an investigation on the synergistic application of the materialsthrough the encapsulation of the bioactive extracts from the mushroom onto the nanoparticle was proposed. The supposed synergy in the activity ofthe extract-nanoparticle complex could hold the key to improved activity of nutraceuticals against resistant microorganisms and tumor cells.Keywords: Coprinus comatus, Lactarius deliciosus, Nanoparticles, Synergy, Bioactive extracts