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Search Results: 1 - 10 of 594255 matches for " M.J. Gray "
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Carbon Dioxide Emission Savings Potential of Household Water Use Reduction in the UK
M.J. Hackett,N.F. Gray
Journal of Sustainable Development , 2009, DOI: 10.5539/jsd.v2n1p36
Abstract: The relationship between household water use and energy consumption was examined to establish whether the conservation of water within a domestic environment offers significant potential for saving energy, thereby reducing household carbon dioxide emissions. Average UK water usage is 55,121 L ca-1yr-1. The supply of this volume of water and its subsequent treatment by the water companies is equivalent to just 38.6 kg CO2 ca-1 yr-1, although this is not currently included in the primary footprint. So water consumption per se does not significantly effect CO2 emissions. However, the heating water within the household using electricity requires 5,036 kWh ca-1yr-1, equivalent to a further 2,830 t CO2 ca-1yr-1 with 57% of energy associated with use of heated tap water. Using gas instead of electricity to heat water can reduce emissions by 63%, equivalent to an average reduction of 4.36 t CO2 yr-1 for a standard household (2.4 occupants). Water efficient appliances and the careful use of heated water in the home could reduce average household water use from 151 to 73 L ca-1d-1 as well as the volume of water required to be heated thereby reducing related emissions by 58% or 1,662 kg CO2 ca-1yr-1, where electricity is used. Maximum CO2 emission reduction is achieved by the use of solar collectors using gas as standby heating fuel. This, coupled with simple water conservation measures, emits as little as 130 kg CO2 ca-1yr-1 a potential saving of 2.7 t CO2 ca-1yr-1.
Cervical spondylomyelopathy (wobbler syndrome) in the Boerboel
M.J. Gray,R.M. Kirberger,T.C. Spotswood
Journal of the South African Veterinary Association , 2012, DOI: 10.4102/jsava.v74i4.520
Abstract: The Boerboel is a South African large-breed dog resembling a Bullmastiff. The records of Onderstepoort Veterinary Academic Hospital were searched for dogs that had presented, between 1998 and 2003, with symptoms indicative of wobbler syndrome and had undergone survey radiographic and myelographic studies. Ten cases fitted the inclusion criteria. Dogs presented within the first 2 years of life, often with acute onset of symptoms. All presented with pelvic limb and 6 with concomitant thoracic limb ataxia or paresis. Treatment varied and included none (4), prednisolone (2), and dorsal laminectomy (2). Two dogs were euthanased at the time of diagnosis. The breed appears to be affected with a form of spondylomyelopathy that comprises bony malformation of cervical and/or thoracic vertebrae. In 8 dogs, malformations were evident on survey radiographs and were characterised by enlarged, irregular articular facets and associated medial deviation of the pedicles. These changes resulted in axial compression of the spinal cord best seen on ventrodorsal or dorsoventral myelographic studies. Multiple vertebrae were affected in some dogs and lesions were not confined to the caudal area of the cervical spine. Three dogs were alive and without symptoms at follow-up. Four were euthanased as a result of the disease and 1 died as a result of post-operative complications. Two additional dogs presenting with wobbler clinical signs are also described. One had medial deviation of the T5 and T6 caudal pedicles and 1 dog suffered from multiple cervical articular facet synovial cysts.
El tabaco y su influencia en el periodonto
Lordelo,M.J.;
Avances en Periodoncia e Implantología Oral , 2005, DOI: 10.4321/S1699-65852005000100003
Abstract: periodontitis is a multifactorial disease. smoking is one of the environmental factors that most changes the susceptibility of the individual to the development of the periodontal disease. analogous to what happens at the level of general health, tobacco causes serious adverse effects in the oral cavity, namely in periodontal tissues. the epidemiologic data taken from literature gives important information that is in agreement with the greater part of the criteria of bradford hill for the establishment of a causal relationship between tobacco and periodontitis. the pathogenesis of the periodontal destruction is extremely complex, since there are diverse critical pathways interconnected between them which participate in the outbreak and evolution of the disease. the mechanism of action of tobacco can be explained by its intervention in each of these pathways. in addition to being a risk factor for the disease, tobacco impairs healing and the response to basic and surgical treatment. bibliographical revision of the published works related to the subject will be carried out.
Summary talk on Cosmology and Gravitation XXII Brazilian National Meeting on Particles and fields
Rebou?as, M.J.;
Brazilian Journal of Physics , 2002, DOI: 10.1590/S0103-97332002000500015
Abstract: the plenary lectures, parallel talks, oral presentations and poster contribuitions on cosmology and gravitation presented during the xxii brazilian national meeting on particles and fields are briefly reviewed. some general remarks are also presented.
Sobre as origens das defini??es dos produtos escalar e vetorial
Menon, M.J.;
Revista Brasileira de Ensino de Física , 2009, DOI: 10.1590/S1806-11172009000200006
Abstract: the operations of two vector multiplication (the scalar and vector products) are introduced in physics and mathematics textbooks just as a definition, without any reference or discussion on the formal reasons and/or motivations that have led to these structures. in this work, a short pedagogical review on the origins of these definitions is presented. we discuss the formal results obtained by hamilton in the context of quaternionic algebra and some "changes" performed by gibbs and heaviside, leading to what is now usually known as "vector algebra". we present comments on some disadvantages of these "changes", referring to more practical and formal systems (grasmmann and clifford algebras). some basic and recent works on the subject are also mentioned and commented.
Nosocomial and Community Acquired Infections in Korle Bu Teaching Hospital, Accra
M.J Newman
West African Journal of Medicine , 2009,
Abstract: BACKGROUND: Nosocomial or hospital acquired infection has been recognized as a serious public health problem in the last twenty years. In most hospitals in Africa-South of the Sahara, although the types of community acquired infections are known, neither the magnitude, nor the common types of nosocomial infections has been documented. OBJECTIVE: This study was carried out to find the prevalence of hospital and community acquired infections in hospitals, and to estimate the overall prevalence of HAI and CAI in Korle Bu Teaching Hospital. METHODS: A one-day prevalence survey of nosocomial and community acquired infection in a tertiary-care hospital in Accra was performed using the 1980 British national protocol and the result was analyzed using computerized gargets. RESULTS: Of the 907 patients on admission (on the day of the study), 61 (6.7%) had hospital-acquired infection and 287 (31.6%) had community acquired infection. The commonest hospital acquired infection was wound infection followed by skin and lower respiratory infections. Of the community infections, the most common cases were lower respiratory and skin infections. Fifty-three percent of all patients were on antimicrobial treatment. Patients on metronidazole were 212 (44%), ampicillin/amoxicillin 199 (41.6%), cloxacillin 163 (34%) and gentamicin 135 (28%). Approximately 20% of patients were on three or more drugs. CONCLUSION: This study has shown that the prevalence of community acquired infections in our hospital is much higher than that from nosocomial infections and that the British national survey protocol can be used in countries with limited resources. WAJM 2009; 28(5): 300–303.
Evaluation of large stock unit equivalents for sheep
M.J. Herselman
South African Journal of Animal Science , 2000,
Abstract: (South African J of Animal Science, 2000, 30, Supplement 1: 53-56)
Laparoscopic Partial Hepatectomy by Using Horizontal Interrupted Mattress Suture in Goats
M.J. Eesa
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2010.272.276
Abstract: This study was designed to evaluate the feasibility of laparoscopic partial hepatectomy by using the intracorporeal horizontal interrupted mattress suture technique. Ten Black Iraqi local old goats of both sexes were used. Animals divided into two equal groups. Laparoscopic partial hepatectomy were performed in both groups comparing horizontal interrupted mattress suture by using polygalactine synthesis absorbable suture material, to suture around the resected part as a triangular in shape. Then resected this a triangular area and without approximate of resected edge in group, A. While the same method in group B but with approximation of the resected edge by simple interrupted suture pattern. The animals were inspected laparoscopically, one month post operation, which revealed that the regeneration of the resected site was better in group, B compared with group, A. In addition to that the adhesion of the resected site with adjacent structures were slight in degree in group, B than in group, A. This technique of intracorporeal horizontal interrupted mattress suture provides to be feasible and can be used in laparoscopic partial liver resection of the peripheral abnormal lesion.
Reversion to juvenility: the use of epicormics in the micropropagation of mature wild shrubs of Vaccinium cylindraceum Smith (Ericacaeae)
PEREIRA, M.J.
Arquipélago : Life and Marine Sciences , 2009,
Abstract: An efficient in vitro method was developed to propagate the shoots of mature wild shrubs of Vaccinium cylindraceum Sm. by axillary bud proliferation on epicormic stems. In the initial culture, 46.9% of the epicormic buds produced new shoots with juvenile morphological features. The number of nodes per shoot and the shoot length for explants which originated from epicormic buds was significantly higher when compared to that of winter dormant buds but similar when compared to that of seedling buds. The three most distal buds of epicormic twigs produced the best rates of shoot initiation: 87.5% (position 1) to 62.5% (position 3).
Range extension of Ceratogyrus sanderi Strand, 1906 (Araneae: Theraphosidae)
M.J Fitzpatrick
Koedoe : African Protected Area Conservation and Science , 1994, DOI: 10.4102/koedoe.v37i1.329
Abstract: The range of the baboon spider Ceratogyrus sanderi Strand, 1906, previously only known to occur in Namibia, has been extended into the northern and western regions of Zimbabwe.
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