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Search Results: 1 - 10 of 118 matches for " Mambo Moyo "
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Horseradish Peroxidase Biosensor to Detect Zinc Ions in Aqueous Solutions  [PDF]
Mambo Moyo
Open Journal of Applied Biosensor (OJAB) , 2014, DOI: 10.4236/ojab.2014.31001
Abstract: Maize tassel-multiwalled carbon nanotube (MT-MWCNT) composite has been used as a matrix for physical adsorption of horseradish peroxidase (HRP) onto the surface of a glassy carbon electrode through electrostatic interactions. The HRP/MT-MWCNT biosensor was applied for the detection of Zn2+ in aqueous solution. The biosensor designed was able to determine Zn2+ in the range of 0.35 - 12 mg/L with a detection limit of 7.5 μg/L. The inhibition was found to be reversible and uncompetitive when data were modeled using the Dixon and Cornish-Bowden plots. The biosensor was found to have good repeatability, reproducibility and high selectivity. The developed biosensor can be used to detect other HRP inhibiting trace metal ions.
Bioremediation of Lead(II) from Polluted Wastewaters Employing Sulphuric Acid Treated Maize Tassel Biomass  [PDF]
Mambo Moyo, Linda Chikazaza
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.412083
Abstract:

The ability to modify a waste by-product precursor, maize tassel biomass using sulfuric acid as the activating agent with specific focus on Lead(II) ion from water has been proposed. The treating of maize tassel using sulphuric acid is believed to enhance sorption capacity of Lead(II) ions. For this, batch adsorption mode was adopted for which the effects of initial pH, adsorbent dosage, contact time and initial concentration were investigated. Consequently, it was found that the adsorbent capacity depends on pH; since it increases up to 4.5 and then decreases. The highest percentage of Lead(II) ion removal was achieved in the adsorbent dosage of 1.2 g and at an initial concentration of 10 mg/L metal ion. In an attempt to determine the capacity and rate of Lead(II) removal, isotherm and kinetic data were modeled using appropriate equations. To this end, the adsorption data fitted best into the Langmuir model with an R2 (0.9997) while kinetically the Lead(II) adsorption followed the pseudo-second-order model. Furthermore, as a way to address issues related to sustainability, maize tassel is recommended since the process is considered to be a dual solution for environmental cleaning. From one side, it represents a better way to dispose the maize tassel which has no use after fertilization and on the other hand it is an economic source of carbonaceous materials.

 

Recent Advances in Polymeric Materials Used as Electron Mediators and Immobilizing Matrices in Developing Enzyme Electrodes
Mambo Moyo,Jonathan O. Okonkwo,Nana M. Agyei
Sensors , 2012, DOI: 10.3390/s120100923
Abstract: Different classes of polymeric materials such as nanomaterials, sol-gel materials, conducting polymers, functional polymers and biomaterials have been used in the design of sensors and biosensors. Various methods have been used, for example from direct adsorption, covalent bonding, crossing-linking with glutaraldehyde on composites to mixing the enzymes or use of functionalized beads for the design of sensors and biosensors using these polymeric materials in recent years. It is widely acknowledged that analytical sensing at electrodes modified with polymeric materials results in low detection limits, high sensitivities, lower applied potential, good stability, efficient electron transfer and easier immobilization of enzymes on electrodes such that sensing and biosensing of environmental pollutants is made easier. However, there are a number of challenges to be addressed in order to fulfill the applications of polymeric based polymers such as cost and shortening the long laboratory synthetic pathways involved in sensor preparation. Furthermore, the toxicological effects on flora and fauna of some of these polymeric materials have not been well studied. Given these disadvantages, efforts are now geared towards introducing low cost biomaterials that can serve as alternatives for the development of novel electrochemical sensors and biosensors. This review highlights recent contributions in the development of the electrochemical sensors and biosensors based on different polymeric material. The synergistic action of some of these polymeric materials and nanocomposites imposed when combined on electrode during sensing is discussed.
Modelling Epidemiological Data Using Box-Jenkins Procedure  [PDF]
Stanley Jere, Edwin Moyo
Open Journal of Statistics (OJS) , 2016, DOI: 10.4236/ojs.2016.62025
Abstract: In this paper, the Box-Jenkins modelling procedure is used to determine an ARIMA model and go further to forecasting. We consider data of Malaria cases from Ministry of Health (Kabwe District)-Zambia for the period, 2009 to 2013 for age 1 to under 5 years. The model-building process involves three steps: tentative identification of a model from the ARIMA class, estimation of parameters in the identified model, and diagnostic checks. Results show that an appropriate model is simply an ARIMA (1, 0, 0) due to the fact that, the ACF has an exponential decay and the PACF has a spike at lag 1 which is an indication of the said model. The forecasted Malaria cases for January and February, 2014 are 220 and 265, respectively.
Naming practices in colonial and post-colonial Malawi
T Moyo
Inkanyiso: Journal of Humanities and Social Sciences , 2012,
Abstract: In African societies naming practices invariably reflected an important rite of passage as a cultural practice, which was always in sync with each society’s ordinary citizens’ socio-cultural and historical conditions. These were ideological conceptions inherent in each society, reflected as a powerful force in naming practices, either of individuals or places. However, naming practices have been in contact with colonialism in Malawi and the rest of Southern Africa, with the result that this has affected the socio-cultural ideologies which were traditionally embedded with naming practices. They have had to change with the times. The result is that such names bestowed on individuals or places changed with the historical times. At times they remained indigenous, were Westernised or fused indigenous and other African names. This changing pattern has thus had to change with socio-cultural, economic, education and political influences prevailing at each time. The discussion indicates that social issues, which traditionally indicated physical and social environment, beliefs of a given sub-culture, were essentially a barometer of meanings and moral codes of a society. However, this tended to change with the attitude and prevailing conditions at specific historical epochs, of how such names were conceived and assigned. Malawi is given as an example, but this could be applied to the entire Southern African region which has been affected by the advent of colonialism and post-colonialism.
Land in the Political Economy of African Development: Alternative Strategies for Reform
S Moyo
Africa Development , 2007,
Abstract: Since 2000, there has been an escalation of land-related conflicts in Zimbabwe, C te d’Ivoire, the Delta region of Nigeria and elsewhere in Africa. These conflicts are examples of numerous national struggles for access to land in Africa and reflect the failure of the African state to address the land and development nexus on the continent. The land question in Africa is a by-product of globalised control of land, natural resources and minerals in general, reflecting incomplete decolonisation processes in ex-settler colonies along with the penchant for foreign ‘investment’ in a neo-liberal policy framework that marginalises the rural and urban poor. Global finance capital is increasingly entangled in conflicts over land, as the exploitation of oil, minerals and natural resources expands into new African enclaves that highlight the external dimension of distorted development. These processes define the significance of land in the political economy of African development. This paper examines the complex social and political contradictions that shape land struggles, including their colonial and post-independence trajectory. The failures of neo-liberal land reforms, based on market forces and their confrontation by popular demands for redistributive reforms are discussed.
International Foundations, Agenda Setting and the Non-Profit Sector in South Africa
B Moyo
African Journal of International Affairs , 2001,
Abstract:
"Isichazamazwi SesiNdebele" as reflector of the moral and ideological values of society
N Moyo
Lexikos , 2007,
Abstract: Isichazamazwi SesiNdebele (henceforth the ISN) reflect the moral and ideological val-ues of society. This article analyses the ISN as reflector of the moral and ideological values of the Ndebele society. The ISN highlights fundamental beliefs and ideas of the Ndebele people. The study stems from the observation that the culture of a people will always reflect in a dictionary as culture and language are inextricably intertwined. The aim of this article is to discuss the ways in which the ISN reflects the moral and ideological values of society. The article examines how the society in which the dictionary was created influenced the choice of lemmas and the phrasing of definitions. The focus is on sexist definitions, terms referring to ethnic groups and the treatment of taboo words and religious terms. These terms denote cultural attitudes harboured by the Ndebele society. The article discusses how the treatment of these terms reflects on the values prevalent in the culture of the Ndebele community.
Do water cuts affect productivity? Case study of African manufacturing firms
B Moyo
Water SA , 2011,
Abstract: This study sought to examine the impact of water disruptions on productivity in African manufacturing firms, using cross-sectional data from the World Bank enterprise surveys. We measured water infrastructure quality or water disruptions using the number of hours per day without water and found this indicator to be a negative and significant determinant of productivity. At country level, this variable seems to be a significant determinant in Uganda and Zambia, whilst firms in the food and agriculture, chemical and pharmacy as well as construction and metals sectors are also similarly affected. To improve economic growth through firm productivity and hence encourage employment creation and better standards of living, governments in Africa need to come up with measures to strengthen the effectiveness of both technical and institutional water infrastructure services.
Isichazamazwi SesiNdebele as Reflector of the Moral and Ideological Values of Society
Nobuhle Moyo
Lexikos , 2011, DOI: 10.5788/17--529
Abstract: : Isichazamazwi SesiNdebele (henceforth the ISN) reflect the moral and ideological values of society. This article analyses the ISN as reflector of the moral and ideological values of the Ndebele society. The ISN highlights fundamental beliefs and ideas of the Ndebele people. The study stems from the observation that the culture of a people will always reflect in a dictionary as culture and language are inextricably intertwined. The aim of this article is to discuss the ways in which the ISN reflects the moral and ideological values of society. The article examines how the society in which the dictionary was created influenced the choice of lemmas and the phrasing of definitions. The focus is on sexist definitions, terms referring to ethnic groups and the treatment of taboo words and religious terms. These terms denote cultural attitudes harboured by the Ndebele society. The article discusses how the treatment of these terms reflects on the values prevalent in the culture of the Ndebele community. Keywords: MONOLINGUAL DICTIONARY, DEFINITIONS, LANGUAGE, CULTURE, TABOO WORDS, IDEOLOGICAL VALUES, SEXIST ATTITUDES Opsomming: Isichazamazwi SesiNdebele as reflekteerder van die morele en ideologiese waardes van die gemeenskap. Isichazamazwi SesiNdebele (voortaan die ISN) weerspie l die morele en ideologiese waardes van die gemeenskap. Hierdie artikel ontleed die ISN as reflekteerder van die morele en ideologiese waardes van die Ndebelegemeenskap. Die ISN belig fundamentele beskouings en opvattings van die Ndebelevolk. Die studie spruit voort uit die waarneming dat die kultuur van 'n volk altyd in 'n woordeboek weerspie l sal word omdat kul-tuur en taal onlosmaaklik vervleg is. Die doel van die artikel is om die maniere te bespreek waarop die ISN die morele en ideologiese waardes van die gemeenskap reflekteer. Die artikel ondersoek hoe die gemeenskap waarin die woordeboek tot stand gekom het die keuse van lemmas en die bewoording van definisies be nvloed het. Die fokus is op seksistiese definisies, terme wat na etniese groepe verwys en die behandeling van taboewoorde en godsdienstige terme. Hierdie terme dui kulturele ingesteldhede aan wat deur die Ndebelegemeenskap gekoester word. Die artikel be-spreek hoe die behandeling van hierdie terme waardes reflekteer wat in die kultuur van die Nde-belesamelewing gangbaar is. Sleutelwoorde: EENTALIGE WOORDEBOEK, DEFINISIES, TAAL, KULTUUR, TABOE-WOORDE, IDEOLOGIESE WAARDES, SEKSISTIESE INGESTELDHEDE
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