Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Search Results: 1 - 10 of 84 matches for " Kwasi Ampofo "
All listed articles are free for downloading (OA Articles)
Page 1 /84
Display every page Item
Harmonizing the agricultural biotechnology debate for the benefit of African farmers
Segenet Kelemu, George Mahuku, Martin Fregene, Douglas Pachino, Nancy Johnson, Lee Calvert, Idupulapati Rao, Robin Buruchara, Tilahun Amede, Paul Kimani, Roger Kirkby, Susan Kaaria, Kwasi Ampofo
African Journal of Biotechnology , 2003,
Abstract: The intense debate over agricultural biotechnology is at once fascinating, confusing and disappointing. It is complicated by issues of ethical, moral, socio-economic, political, philosophical and scientific import. Its vocal champions exaggerate their claims of biotechnology as saviour of the poor and hungry, while, equally loudly, its opponents declare it as the doomsday devil of agriculture. Sandwiched between these two camps is the rest of the public, either absorbed or indifferent. Biotechnology issues specific to the African public must include crop and animal productivity, food security, alleviation of poverty and gender equity, and must exclude political considerations. Food and its availability are basic human rights issues—for people without food, everything else is insignificant. Although we should discuss and challenge new technologies and their products, bringing the agricultural biotechnology debate into food aid for Africa where millions are faced with life-or-death situations is irresponsible. Agricultural biotechnology promises the impoverished African a means to improve food security and reduce pressures on the environment, provided the perceived risks associated with the technology are addressed. This paper attempts to harmonize the debate, and to examine the potential benefits and risks that agricultural biotechnology brings to African farmers.
Heat Transfer by Natural Convection from a Vertical and Horizontal Surfaces Using Vertical Fins  [PDF]
Energy and Power Engineering (EPE) , 2009, DOI: 10.4236/epe.2009.12013
Abstract: Natural convective heat transfer from a heated horizontal and vertical surfaces directly exposed into air which vertical fins, attached to a surface, project vertically downwards has been numerically studied. It has been assumed that the fins are everywhere at the temperature of the surface. The governing equations, written in dimensionless form, have been solved using the finite element procedure. The results show that vertical plate with vertical fins gives the best performance for natural cooling.
A Community-based feasibility study of National Health Insurance scheme in Ghana
Dominic Edoh, Ampofo Brenya
African Journal of Health Sciences , 2002,
Abstract: In a community based study at Legon in 1997, a valuation method was used to assess the willingness of students on study leave to pay a percentage premium of their income towards a National Health Insurance Scheme (NHIS). Thirty-five percent of the respondents were aged 30-40 years, 97% were males, 45% were resident in Accra, 17% in Kumasi and 12% in Cape Coast. Respondents were 84% in formal public employment with 44% majority as teachers. Their monthly income was distributed as 33% earned below .200,000, 50% between .200,000 – .400,000 and 7% above .400,000. More than 74% were willing to contribute to the scheme with 38% and 37% willing to pay 1% and 2% of their income as monthly premium respectively. Those willing to pay 2% premium, 14 (n=33) earned below.200,000, 18 (n=50) between .200,000 – .400,000, and 5 (n=17) above .400,000. Malaria was the commonest disease with 86% incidence, however 30% of respondents revealed they did not spend money on hospital services except 39% who spent .20,000 – .100,000 on hospital laboratory services. Over 65% of respondents indicated they self financed their health expenditure. The premium level was found to be influenced positively by financier, sex, age, income, and negatively by health expenditure, but not occupation. In an elite community with inadequate infrastructure and water supply problems but probably with better personal hygiene and sanitation, although respondents hardly spend on health services they were willing to contribute 2% of their incomes as premium towards an insurance scheme. [Afr. J. Health Sci. 2002: 9:41-50 ]
Growth Response of Gliricidia sepium (Jacq.)Walp to Inoculation with Different Arbuscular Mycorrhizal (Am) Fungi
K Twum-Ampofo
Journal of Science and Technology (Ghana) , 2008,
Abstract: This study was conducted to assess the variation in performance of four arbuscular mycorrhizal fungi (Glomus clarum, Glomus etunicatum, Glomus intraradices, and Gigaspora rosea) with and without Rhizobium inoculation in promoting growth and nutrient (N and P) uptake in Gliricidia sepium. Gliricidia seedlings were grown in sterilised (autoclaved) vermiculite and sand mixture in 2:1 (v:v). Each week, plants received 50 cm3 of nutrient solution (with N and P additions) according to the treatments. The experimental design was a 4x2 factorial arranged in a randomised complete block design. Seedlings were harvested after 12 weeks. Dry weights of plant parts, nodulation, arbuscular mycorrhizal fungal colonization, nitrogen and phosphorus concentration and content were determined. AM fungi differed in their effectiveness in enhancing growth of Gliricidia sepium. Glomus clarum was most efficient and produced statistically higher total plant dry weight than other mycorrhizal fungi. Dual inoculation with AM fungi and Rhizobium was effective in promoting host plant growth over Rhizobium- uninoculated mycorrhizal plants in terms of leaf area, shoot and root dry weights, total plant biomass and shoot-root ratio. Rhizobium-inoculated Glomus clarum treatment recorded significantly higher (approximately a third fold increase) total plant dry weight, than the similar treatments of Glomus etunicatum, Glomus intraradices and Gigaspora rosea. Shoot-root ratio was statistically greater with mycorrhizal plants inoculated with Rhizobium than the non-Rhizobium inoculated treatments due to improved mineral nutrition particularly nitrogen (through nitrogen fixation). Nodulation assessed by the number of nodules produced per plant was statistically similar between the Rhizobium- inoculated mycorrhizal treatments but significantly higher than the Rhizobium- inoculated non-mycorrhizal comparison treatment. Plants inoculated with Glomus clarum and Glomus intraradices significantly achieved higher root colonization than Glomus etunicatum and Gigaspora rosea. Rhizobium inoculation reduced root colonization with all the Glomus species except Gigaspora rosea. A highly significant (P<0.001) interaction between mycorrhiza and Rhizobium was observed for mycorrhiza root colonization. Rhizobium- inoculated treatments recorded significantly higher N concentration and content over non-Rhizobium mycorrhizal plants supplied with combined nitrogen. Inoculation with Glomus clarum significantly increased P concentration and content in all plant parts. Gigaspora rosea was least effective in promoting phosphorus uptake. Arbuscular mycorrhiza fungi infection was positively correlated with P concentration (%P) (r=0.74, P<0.01), and P content (mgP) (r=0.52, P<0.01). The study has shown the importance of some AM fungi for legume tree growth and nutrition and therefore in nutrient deficient soils, effective mycorrhizal fungus and Rhizobium could be used to promote growth and nitrogen fixation in N2-
Microbiological Profile of Some Ghanaian Herbal Preparations—Safety Issues and Implications for the Health Professions  [PDF]
Joseph A. Ampofo, Anthonia Andoh, Wilhermina Tetteh, Mohammed Bello
Open Journal of Medical Microbiology (OJMM) , 2012, DOI: 10.4236/ojmm.2012.23018
Abstract: Thirty-one herbal preparations produced and sold on the Ghanaian market were randomly purchased from sales outlets and analyzed for their microbiological quality by testing for the presence of total coliform bacteria, faecal coliform bac- teria, and total heterotrophic bacteria count. Also tested for was detection of pathogenic bacteria such as the Salmonella spp. and Clostridium spp. Opportunistic bacterial pathogens (Aeromonas spp., Enterococcus spp. and Pseudomonas spp.) and mould were also tested for. The herbal preparations tested came from different processing companies and in- cluded those labeled as suitable for treating arthritis, asthma, anaemia, diabetes mellitus, epilepsy, cough, hypertension, dysmenorrhoea, malaria, urine retention and loss of appetite. Aliquots of the various herbal products were cultured on various selective media. Eight (8) of the products showed the presence of all microorganism analyzed for including the pathogenic ones and are recommended not be used. Five (5) of the products did not have any microorganism present. Eleven (11) products showed the presence of only total heterotrophic bacteria and the values ranged from 1 to 94 cfu per ml. These two groups of total of sixteen (16) products can be used without any microbiological risk. Another three (3) products showed presence of only total heterotrophic bacteria but the values ranged from 118 to 1648 cfu per ml. Majority of the herbal preparations showed the presence of pathogenic bacteria. These three products may pose danger to the user can be used with caution. None of the herbal products recorded the presence of Enterococcus spp.
The Quality and Health Implications of Urban Irrigation Water Used for Vegetable Production in the Accra Metropolis  [PDF]
Mark O. Akrong, Joseph A. Ampofo, Seth K. A. Danso
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.311167
Abstract: The quality of irrigation water from different sources used by urban farmers in the Accra Metropolis was investigated. These were, tap water stored in dugout, surface water (from stream) and wastewater in drains. The samples were analysed for their bacteriological, physical and chemical qualities using standard methods. Analytical Profile Index (API) identification system was used to characterize and identify the bacterial species isolated in the samples. The results showed that heavy metal concentrations in the samples were within the FAO/WHO recommended limits for irrigation. The concentrations of highly toxic Lead and Cadmium were even below detection limit. Total and faecal coliform bacteria loads in all three potential irrigation water sources were above the WHO recommended limit for irrigation. Different bacteria species belonging to seven genera were identified in the three irrigation water sources. These included Citrobacter, Chryseomonas, Enterobacter, Klebseila, Proteus, Providencia, Pseudomonas. Generally, the most dominant bacterial species were Pseudomonas aeruginosa and Chryseomonas luteola. Some of these bacteria spp. can pose a health threat to farmers especially those who have challenges with their health and immune system. For example, infection with some of the bacteria species such as Pseudomonas aeruginosa in patients with cystic fibrosis is known to be deadly over periods of time.
Urban and Peri-Urban Agriculture in Developing Countries Studied using Remote Sensing and In Situ Methods
Kwasi Appeaning Addo
Remote Sensing , 2010, DOI: 10.3390/rs2020497
Abstract: Urban farming, practiced by about 800 million people globally, has contributed significantly to food security and food safety. The practice has sustained livelihood of the urban and peri-urban low income dwellers in developing countries for many years. Its popularity among the urban low income is largely due to lack of formal jobs and as a means of adding up to household income. There is increasing need to sustainably manage urban farming in developing nations in recent times. Population increase due to rural-urban migration and natural, coupled with infrastructure developments are competing with urban farming for available space and scarce resources such as water for irrigation. Lack of reliable data on the extent of urban/peri-urban areas being used for farming has affected developing sustainable policies to manage urban farming in Accra. Using ground based survey methods to map the urban farmlands are inherently problematic and prohibitively expensive. This has influenced accurate assessment of the future role of urban farming in enhancing food security. Remote sensing, however, allows areas being used as urban farmlands to be rapidly established at relatively low cost. This paper will review advances in the use of remote sensing technology to develop an integrated monitoring technique for urban farmlands in Accra.
An Evaluative Study of a Distance Teacher Education Program in a University in Ghana
Kwasi Addo Sampong
International Review of Research in Open and Distance Learning , 2009,
Abstract: The study used an adaptation of Provus’ discrepancy evaluation model to evaluate a distance teacher education program in the University of Cape Coast, the premier teacher education institution in Ghana. The study involved comparing performance data of the program as perceived by students and faculty/administrators to standards prepared from the program’s design. Performance data was obtained by administering two survey instruments to a random sample of students and faculty/administrators. Discrepancies between performance and standards were reported. The study concluded that although there were some discrepancies between program standards and performance the program is fulfilling its purpose of upgrading the professional and academic performance of a large number of teachers in the public K-8 schools in Ghana.
The Cultural Approach to the Management of the International Human Resource: An Analysis of Hofstede’s Cultural Dimensions
Kwasi Dartey-Baah
International Journal of Business Administration , 2013, DOI: 10.5430/ijba.v4n2p39
Abstract: The subject of culture has gained much prominence and attention in the management of international human resource. This paper examines the issues of culture, both national and organisational, reviews and discusses relevant literature and draws conclusions based on the issues at hand. The discussion of this paper is based on Hofstede’s cultural dimensions. The findings of this paper revealed that elements contained in national cultures can transcend into organizational concerns. Moreover, not only are national cultures the main determinants of the success or failure of multinational businesses, but also organisational cultures. The paper advances that in dealing with matters of culture in the international domain, the point in question is how these cultural issues are managed and not the mere existence of the same that determines the success or failures of organisations.
Evaluation of Fuel Properties of Six Tropical Hardwood Timber Species for Briquettes  [PDF]
Stephen J. Mitchual, Kwasi Frimpong-Mensah, Nicholas A. Darkwa
Journal of Sustainable Bioenergy Systems (JSBS) , 2014, DOI: 10.4236/jsbs.2014.41001

The fuel potential of six tropical hardwood species namely: Triplochiton scleroxylon, Ceiba pentandra, Aningeria robusta, Terminalia superba, Celtis mildbreadii and Piptadenia africana were studied. Properties studied included species density, gross calorific value, volatile matter, ash content, organic carbon and elemental composition. Fuel properties were determined using standard laboratory methods. The result indicates that the gross calorific value (GCV) of the species ranged from 20.16 to 22.22 MJ/kg and they slightly varied from each other. Additionally, the GCV of the biomass materials were higher than that of other biomass materials like; wheat straw, rice straw, maize straw and sugar cane. The ash and volatile matter content varied from 0.6075 to 5.0407%, and 75.23% to 83.70% respectively. The overall rating of the properties of the six biomass materials suggested that Piptadenia africana has the best fuel property to be used as briquettes and Aningeria robusta the worse. This study therefore suggests that a holistic assessment of a biomass material needs to be done before selecting it for fuel purpose.

Page 1 /84
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.