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Search Results: 1 - 10 of 225 matches for " Neville Hewage "
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Evaluation of the Pathogen Detect System and Anthracene-Based Enzyme Substrates for the Detection and Differentiation of E. coli and Total Coliforms in Water Samples  [PDF]
Neville Hewage, Mazen Saleh
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.79056
Abstract: Indirect detection of Escherichia coli and total coliforms can be based on the enzymatic activities of β-glucuronidase (β-glu) and β-galactosidase (β-gal). These enzymes utilize the substrates anthracene-β-d-glucuronide and pyrene d-galactopyranoside, respectively. Substrate cleavage by the enzyme releases the soluble fluorescent molecules 2-hydroxyanthracene and 1-hydroxypyrene, which can then be detected by a fluorometer. The Pathogen Detect system is an automated portable unit that can measure fluorescent enzyme products. In this report, we investigated the utility of the Pathogen Detect system for potential automation of water quality monitoring. The PDS unit has the ability to detect E. coli, mean 14.7 h at a standard deviation of 1.5, when the sample mean is 9.1 cells in 100 mL with a standard deviation of 12.6. Similarly, total coliforms may be detected at mean 14.7 h with a standard deviation of 1.4 when the sample mean is 59.6 cells in 100 mL, with a standard deviation of 144.5. The PDS unit has the ability to detect single cells of either total coliforms or E. coli in 100 mL water sample within 18 hours. Turbidity and color of water samples have no impact on the detection of E. coli and total coliforms.
Sustainable Materials Selection for Canadian Construction Industry: An Emergy-Based Life-Cycle Analysis (Em-LCA) of Conventional and LEED Suggested Construction Materials
Navid Hossaini,Kasun Hewage
Journal of Sustainable Development , 2011, DOI: 10.5539/jsd.v5n1p2
Abstract: Building industry is a major cause of ecological and environmental problems in the global scale. It accounts for 40% of material and 30% of global energy consumption. Emergy (spelled with an “m”) is the energy of one kind (usually solar energy) that is used, directly or indirectly, to make a product or service. The objective of this paper is to identify sustainable construction materials by assessing the specific emergy of major construction materials used in Canada, including a few rapidly renewable materials suggested by Leadership in Energy and Environmental Design (LEED). Lifecycle analysis (LCA) of the selected materials was carried out to identify all type of natural, human, and energy resources used in their production process. The specific emergy of each selected material was calculated using the corresponding transformity functions. Results show that rapidly renewable materials suggested by LEED should not be taken blindly without considering the location of construction.
What can health care professionals in the United Kingdom learn from Malawi?
Ron Neville, Jemma Neville
Human Resources for Health , 2009, DOI: 10.1186/1478-4491-7-26
Abstract: Health is global. Health is local. Health is individual. How should health care professionals conceptualize and then act on the need to manage their individual patients as best they can in a local and personal context, while taking account of the globalization of many aspects of society, including health? How can we solve the conundrum of acting both locally and globally to help patients?Health has become a global issue because viruses such as HIV and SARS do not respect international borders [1,2]. The failure of immunization delivery in one country can precipitate the return of a disease in surrounding countries, as the recent example of polio in Nigeria shows [3]. Malaria eradication schemes in one area are ineffective unless neighbouring countries adopt similar strategies [4].Access to uncontaminated water is a fundamental prerequisite for good health. Conflict zones, water supply disputes and lack of engineering infrastructure prevent large areas of the world's population from achieving a reasonable health status [5].Availability of trained health care staff is inequitable across urban and rural areas, across borders and regions. Staff recruiting policy in one country can destabilize health care provision in another country. For example, the United Kingdom's importing nurses to support the expansion of care homes for the elderly led to a further exodus of trained nursing staff from southern Africa [6].The availability and supply of modern pharmaceuticals has become an issue of international concern, particularly with regard to antiretroviral HIV drugs. Seemingly simple solutions to global inequality of supply, such as the free provision of high-quality pharmaceuticals manufactured in the developed world, have been blighted by the reappearance of the same drugs sold back into the developed world and also by the appearance of poor-quality counterfeit products [7].The emergence of the Internet as the dominant source of educational support in both the developed and
Cidadania, identidade racial e constru??o nacional na áfrica do Sul
Alexander, Neville;
Tempo Social , 2006, DOI: 10.1590/S0103-20702006000200006
Abstract: this article examines the relationship between affirmative action as applied in post-apartheid south africa and the concomitant perpetuation of racial identities that were shaped by the colonial and apartheid history of the country. it problematises this state of affairs and suggests an alternative, less divisive and dangerous course.
Advances in gold powder technology
Neville Collier
Gold Bulletin , 1977, DOI: 10.1007/BF03215432
Abstract: The routes for the preparation of gold powders, required for many important industrial applications, are described in this article. Attention is drawn to the highlights of recent work designed to improve the reproducibility of particle size and shape of gold powders made by precipitation from aqueous solutions.
Referencing: Principles, Practice and Problems
Colin Neville
RGUHS Journal of Pharmaceutical Sciences , 2012,
Abstract: This paper explores a neglected aspect of academic writing, namely the principles and practice of referencing sources. In recent years, plagiarism has been a dominant concern for higher education practitioners. However, there can be a fine line between plagiarism and poor referencing practice, and higher education institutions report that students often struggle to understand, not just the ‘how’, but the ‘when’ and ‘why’ aspects of referencing. This paper will, however, assert that student difficulties can stem from the inconsistencies of institutional advice, proliferation of referencing styles, and an over-emphasis by institutions on the technical presentation of sources, rather than on the principles underpinning referencing. The author will argue that academic writers, particularly students, should be encouraged by institutions to perceive referencing primarily as a tool for the development of an authentic authorial voice, rather than just as a defensive shield against accusations of plagiarism.
Lucas numbers of the form PX2, where P is prime
Neville Robbins
International Journal of Mathematics and Mathematical Sciences , 1991, DOI: 10.1155/s0161171291000935
Abstract: Let Ln denote the nth Lucas number, where n is a natural number. Using elementary techniques, we find all solutions of the equation: Ln=px2 where p is prime and p<1000.
Lucas partitions
Neville Robbins
International Journal of Mathematics and Mathematical Sciences , 1998, DOI: 10.1155/s0161171298000532
Abstract: The Lucas sequence is defined by: L0=2,L1=1,Ln=Ln ¢ ’1+Ln ¢ ’2 for n ¢ ‰ ¥2. Let V(n), r(n) denote respectively the number of partitions of n into parts, distinct parts from {Ln}. We develop formulas that facilitate the computation of V(n) and r(n).
Vieta's triangular array and a related family of polynomials
Neville Robbins
International Journal of Mathematics and Mathematical Sciences , 1991, DOI: 10.1155/s0161171291000261
Abstract: If n ¢ ‰ ¥1, let the nth row of an infinite triangular array consist of entries B(n,j)=nn ¢ ’j(jn ¢ ’j), where 0 ¢ ‰ ¤j ¢ ‰ ¤[12n].
Some congruence properties of binomial coefficients and linear second order recurrences
Neville Robbins
International Journal of Mathematics and Mathematical Sciences , 1988, DOI: 10.1155/s0161171288000900
Abstract: Using elementary methods, the following results are obtained:(I) If p is prime, 0 ¢ ‰ ¤m ¢ ‰ ¤n, 00, if un=rn ¢ ’snr ¢ ’s, vn=rn+sn, and k ¢ ‰ ¥0, then (II) vkpn ¢ ‰ vkpn ¢ ’1(modpn); (III) If p is odd and p ¢ ¤D, then ukpn ¢ ‰ (Dp)ukpn ¢ ’1(modpn); (IV) uk2n ¢ ‰ ( ¢ ’1)Buk2n ¢ ’1(mod2n).
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