Bio

Dr.Maina Joyce

Dr. Joyce Maina is a senior lecturer at the Department of Animal Production, College of Agriculture &Veterinary Sciences in the University of Nairobi. She holds a Doctor of Philosophy in Animal Nutrition from the University of British Columbia in Vancouver, British Columbia, Canada.

Publications


2016

Wesonga, P.W, Mukoya-Wangia S, Njoka JT, Maina JG.  2016.  PROFITABILITY OF ECONOMIC STIMULUS PROGRAM (ESP) FISH FARMING ADOPTERS IN MAKUENI COUNTY, KENYA. European American Journals. 2(3):1-12.

2012

Maina, JG;, Mbuthia PG;, Ngugi JN;, Karuri EG;, Owiti GO;, Omolo B;, Orina P;, Wangia SM.  2012.  Effects Of Management‟s Practices And Economic Stimulus Program On Fish Production In Mwea Division Of Kirinyaga County..
Wood, CM, Bergman HL, Bianchini A, Laurent P, Maina J, Johannsson OE, Bianchini LF, Chevalier C, Kavembe GD, Papah MB, Ojoo RO.  2012.  Transepithelial potential in the Magadi tilapia, a fish living in extreme alkalinity. Abstract

We investigated the transepithelial potential (TEP) and its responses to changes in the external medium in Alcolapia grahami, a small cichlid fish living in Lake Magadi, Kenya. Magadi water is extremely alkaline (pH = 9.92) and otherwise unusual: titratable alkalinity (290 mequiv L(-1), i.e. HCO(3) (-) and CO(3) (2-)) rather than Cl(-) (112 mmol L(-1)) represents the major anion matching Na(+) = 356 mmol L(-1), with very low concentrations of Ca(2+) and Mg(2+) (<1 mmol L(-1)). Immediately after fish capture, TEP was +4 mV (inside positive), but stabilized at +7 mV at 10-30 h post-capture when experiments were performed in Magadi water. Transfer to 250% Magadi water increased the TEP to +9.5 mV, and transfer to fresh water and deionized water decreased the TEP to -13 and -28 mV, respectively, effects which were not due to changes in pH or osmolality. The very negative TEP in deionized water was attenuated in a linear fashion by log elevations in [Ca(2+)]. Extreme cold (1 vs. 28°C) reduced the positive TEP in Magadi water by 60%, suggesting blockade of an electrogenic component, but did not alter the negative TEP in dilute solution. When fish were transferred to 350 mmol L(-1) solutions of NaHCO(3), NaCl, NaNO(3), or choline Cl, only the 350 mmol L(-1) NaHCO(3) solution sustained the TEP unchanged at +7 mV; in all others, the TEP fell. Furthermore, after transfer to 50, 10, and 2% dilutions of 350 mmol L(-1) NaHCO(3), the TEPs remained identical to those in comparable dilutions of Magadi water, whereas this did not occur with comparable dilutions of 350 mmol L(-1) NaCl-i.e. the fish behaves electrically as if living in an NaHCO(3) solution equimolar to Magadi water. We conclude that the TEP is largely a Na(+) diffusion potential attenuated by some permeability to anions. In Magadi water, the net electrochemical forces driving Na(+) inwards (+9.9 mV) and Cl(-) outwards (+3.4 mV) are small relative to the strong gradient driving HCO(3) (-) inwards (-82.7 mV). Estimated permeability ratios are P (Cl)/P (Na) = 0.51-0.68 and [Formula: see text] = 0.10-0.33. The low permeability to HCO(3) (-) is unusual, and reflects a unique adaptation to life in extreme alkalinity. Cl(-) is distributed close to Nernst equilibrium in Magadi water, so there is no need for lower P (Cl). The higher P (Na) likely facilitates Na(+) efflux through the paracellular pathway. The positive electrogenic component is probably due to active HCO(3) (-) excretion.

2005

G, DMAINAJOYCE.  2005.  Maina, J.G., Kabuage, L.W and Owiti C (2005). Integrating Fish Culture into rice farming at Mwea Irrigation Scheme in Kirinyaga District Phase 2: Choice of species, stocking density and potential of local fish species to be used in the control of mosquito. AICAD Final Reports Presentation Workshop at the Jomo Kenyatta University of Agriculture and Technology (12th &#8211; 14th September 2005).. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.
G, DMAINAJOYCE.  2005.  Kabuage, L.W. and Maina, J.G. (2005). Assessment of Rice Based Feedstuffs for Poultry Production at Mwea Irrigation Scheme.. African Institute for Capacity Development (AICAD) conference (12th &#8211; 14th September 2005) at Jomo Kenyatta Institute of Agriculture and Technology, Nairobi.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.
G, DMAINAJOYCE.  2005.  Maina, J.G., Beames, R.M., Higgs, D., Iwama, G., Mbugua, P.N. and Kisia S. (2005). A Comparison of the Nutritional Quality of Kenya’s omena fishmeal and LT. Anchovy fishmeal fed to tilapia Oreochromis niloticus (Linn).. Veterinary Journal Vol. 49 (2005).. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.

2004

G, DMAINAJOYCE.  2004.  Maina, J.G., Kabuage, L.W. and Omolo B. (2004). Integrating fish culture into rice and livestock farming at Mwea Irrigation Scheme in Kirinyaga District Phase 1: The Possibilities and Challenges.. African Institute for Capacity Development (AICAD) conference (9th September &#8211; 11th September 2004) at Jomo Kenyatta College of Agriculture and Technology, Nairobi Kenya.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.

2003

G, DMAINAJOYCE.  2003.  Maina, J.G., Beames, R.M., Higgs D., Iwama, G., Mbugua, P.N., and Kisia S. (2003). Partial replacement of fishmeal with sunflower cake and corn oil in diets for tilapia Oreochromis niloticus (Linn): Effect on whole body fatty acids.. Aquaculture Research 34, 601 &#8211; 608.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.

2002

G, DMAINAJOYCE.  2002.  Maina, J.G., and Mwangi T.K. (2002). Current land tenure system and the feminization of poverty – the case of the Central Kenya highlands.. Biennial Scientific Conference of the Faculty of Veterinary Medicine, College of Agriculture and Veterinary Sciences, University of Nairobi, 7th &#8211; 9th August 2002.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.
G, DMAINAJOYCE.  2002.  Maina, J.G. (2002). Aquaculture in Kenya – Past Constrains and future prospects.. 2nd Scientific Conference of the Kenya Livestock Technologists Association (KELITA). 10th to 13th September 2002. Nairobi, Kenya.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.
G, DMAINAJOYCE.  2002.  Maina, J.G., Beames, R.M., Higgs, D., Iwama G., Mbugua, P.N. and Kisia S. (2002). Digestibility and feeding value of some feed ingredients fed to tilapia Oreochromis niloticus (Linn).. Aquaculture Research 33 (11), 853-862.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.

2000

G, DMAINAJOYCE.  2000.  Maina, J.G., Beames, R.M., Higgs, D., Iwama, G., Mbugua, P.N. and Kisia A. (2000). Digestibility, Feeding value and limiting amino acids in high-fibre and fibre-reduced sunflower cake fed to tilapia O. niloticus.. Canadian Association of African Studies. Edmonton, Alberta, Canada April 30th &#8211; May 4th 2000.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.

1998

  1998.  Air Breathing: the Elite Respiration. AbstractWebsite

Water forms an important structural and functional constituent of the intercellular and intracelular lung tissue (e.g., Bastacky et al. 1987). Furthermore, a hydrated layer lines the air spaces of the lung (e.g., Fishman et al. 1957; Cantin et al. 1987; Chinard 1992). In the larger air spaces, the aqueous layer is comprised mostly of mucus, a glycoprotein-containing phase which is about 98% water (e.g., Sturgess 1979). The mucus forms an important source of moisture which humidifies the inhaled air, traps solid particles, and protects the ciliated epithelium. At the alveolar level, the hydrated layer occurs in form of an aqueous subphase in which proteins, carbohydrates, ions, and surfactant are dissolved. In the vertebrate lungs, where detailed investigations have been carried out, gas exchange occurs across an extracellular alveolar fluid film which lines the surface. The lining has been lucidly demonstrated by Finley et al. (1968), Weibel and Gil (1968), Kikkawa (1970), Bastacky et al. (1987, 1993), and Hook et al. (1987). In the airways, the thickness of the surface liquid lining is 20 to 150 µm (Widdicombe 1997) while on the alveolar surface, the thickness ranges from 0.1 to 0.241Im (Weibel and Gil 1968; Bastacky et al. 1993, 1995; Stephens et al. 1996). In the human lung, it has been estimated physiologically (e.g., Rennard et al. 1986) that the epithelial lining fluid (ELF) makes up 20 to 40 ml while through morphometric techniques (e.g., Untersee et al. 1971; Gorin and Steward 1979), the ELF was estimated to range from 15 to 70 ml. The alveolar fluid layer contributes significantly to the gas exchange function of the lung

1992

G, DMAINAJOYCE.  1992.  Maina, J.G., Mbugua P.N. and Mitaru B. (1992). Effect of Biotin supplementation in broiler chicken: Effect on growth, Feed Conversion Ratio, Hepatic lipid content and plasma biotin levels.. Animal Production Society of Kenya Egerton, Njoro. July 1992.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.
G, DMAINAJOYCE.  1992.  Maina, J.G. and Gichohi C.M. (1992). Poultry Production and Marketing in Kenya. In. All Africa Conference on Animal Agriculture. Nairobi, Kenya.November 1992.. : The Kenya Medical Association Abstract
Quality of health education during STD case management in Nairobi was assessed in 142 healthcare facilities, through interviews of 165 providers, observation of 441 STD patients managed by these providers, and 165 visits of simulated patients. For observations, scores were high for education on contact treatment (74-80%) and compliance (83%), but unsatisfactory for counselling (52%) and condom promotion (20-41%). The World Health Organization (WHO) indicator for STD case management Prevention Indicator 7 (PI7) (condom promotion plus contact treatment) was poor (38%). Public clinics strengthened for STD care generally performed best, whereas pharmacies and mission clinics performed worst. Compared with observations, scores were higher during interviews and lower during simulated patient visits, indicating that knowledge was not fully translated into practice. Interventions to improve the presently unsatisfactory service quality would be wide distribution of health education materials, ongoing training and supervision of providers, implementation of STD management checklists, and the introduction of pre-packaged kits for STD management.

1985

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