Bio

Professor

EMPLOYMENT
Designation: Associate Professor in Range Management and Former Chairman, Range Management, Department of Land Resource Management and Agricultural Technology, University of Nairobi

SUMMARY OF SKILLS AND RELEVANT EXPERIENCE

Publications


2012

Feyssa, Debela, H, Njoka JT, Asfaw Z, Nyangito MM.  2012.  Nutritional Value of Berchemia discolor: A Potential to Food and Nutrition Security of Households. Abstract

Drylands have a multitude of livelihood problems where food insecurity is one of the serious impediments. Both transhumance and settled farmers make their living in the semiarid parts of east Shewa, Ethiopia. They adapt partly to food shortage by using natural resources. The study objective was to determine nutritional value of fruit of Berchemia discolor and analyse the use and management practices and associated indigenous knowledge. Data were collected from three study sites each in Fantalle and Boosat districts in East Shewa Zone. Before the laboratory analysis of fruit, the species was identified through focus group discussions and field observations. Mineral elements and phosphorus were determined in dry matter basis. Vitamin A and C were determined by spectrophotometer and redox titration respectively. Analysis of variance was done and means were separated by LSD at 0.05. Berchemia discolor is a candidate for dry land agroforestry and agrobiodiversity. Ten major uses of B. discolor (food, medicine, fuel wood and others) and food value were the highest. Total carbohydrates, crude protein, crude lipid, moisture and total ash contents of the fruit pulps ranged from 4.17-4.35%. The calculated energy from total carbohydrates was 314.50 kcal/100 g. Transhumance conserves Wild Edible Plants (WEPs) in pasture land and protect of vegetation, while settled farmers in traditional dryland agroforestry, in live fence and farm boarders. Berchemia discolor is one of the potential resources to enhance people’s livelihoods. Technologies for improved use and market chain need policy attention.

2011

Eunice, GW, Charles K GK.  2011.  Soil physicochemical properties under Acacia senegal varieties in the dryland areas of Kenya. Abstractabstract24.pdfWebsite

Acacia senegal is a multipurpose drought-tolerant tree or shrub legume and is commonly used in agroforestry systems in sub-Saharan Africa for gum arabic production and soil fertility improvement. Despite its wide distribution in Kenya, there has not been exhaustive evaluation on the effects of the extant varieties (kerensis, leiorhachis and senegal) on soil properties under their canopies for sustainable utilization of the species. Three sites in the drylands of Kenya representing the three varieties were selected for assessment. Soil samples were collected under tree canopies at a depth of 0 to 25 cm and were compared with the soils from the open canopies. There were significant differences in soil physicochemical properties among the three varieties (P<0.05 and P< 0.01). Soil nutrients under the canopies were higher than in the open canopies mainly due to effects of litter accumulation. The three varieties have beneficial effects on soil nutrient status in their natural ecosystems and would most likely improve crop productivity in agroforestry systems as well as enhance herbage productivity in the rangelands. The varieties growing under different soil types may have an effect on their gum Arabic production and quality. Key words: Acacia senegal varieties, soil nutrients accumulation, sustainable utilization.

Githae, EW;, Gachene CKK;, Njoka JT;, Odee DW;, Omondi SF.  2011.  Genefic Diversity of Gum Arabic-producing Acacia senegal Variefies in Kenya using Inter-Simple Sequence Repeat (ISSR) and Chloroplast Simple Sequence. Abstract

Acacia senegal is a drought-tolerant, multi-purpose tree species, highly valued for gum arabic production and increasingly being used in agro-forestry in Sub-Saharan Africa. Despite its long history of use, there has not been exhaustive genetic evaluation of the extant genetic resource base of A. senegal in Kenya for genetic improvement of the species. Inter-simple sequence repeat (ISSR) and chloroplast microsatellite (cpSSR) markers were used to study genetic diversity among seven Kenyan populations of A. senegal embracing three putative varieties: kerensis, leiorhachis and senegal. The two marker types detected similar levels of Nei’s gene diversity (HISSR = 0.211, HcpSSR = 0.212) among the A. senegal populations. Acacia senegal var. kerensis exhibited the highest diversity using ISSR markers (HISSR = 0.248), followed by varieties leiorhachis (HISSR = 0.218) and senegal (HISSR = 0.151). Analysis of molecular variance (AMOVA) detected significant genetic variations within and among populations (P < 0.001 and P < 0.01 for ISSR and cpSSR, respectively). Based on the unweighted pair group method with arithmetic mean (UPGMA) dendrogram of the seven populations, two regions were differentiated (north and south). Both markers demonstrated their potential for delineating population structure at local and regional levels, and infra-specific relations within the species, hence their potential as tools for conservation, improvement programmes and sustainable use of the species. This study provides baseline genetic information for the domestication of A. senegal varieties in Kenya.

Emmanuel, TV, Njoka JT, Catherine LW, Lyaruu HVM.  2011.  Nutritive and anti-nutritive qualities of mostly preferred edible woody plants in selected drylands of Iringa District, Tanzania. Abstract

Nutritional and anti-nutritional factors of preferred woody plants were evaluated in selected drylands of Iringa District. Vangueria infausta (Burch.) and Vitex mombassae (Vatke.) identified as source of edible fruits; Adansonia digitata (L.) and Sterculia africana (Lour.) were preferred for oil products whereas Opilia amentacea (Roxb.) and Maerua angolensis (DC.) were used as sources of vegetables. The nutrients and anti-nutrients were evaluated using laboratory standard methods. Results show that there were significant differences (p<0.05) in percentage moisture content, dry matter, crude protein, crude and carbohydrates in all species used as sources of oils, vegetables and fruits. Percent ash content was different among the preferred species for vegetables and fruits. S. africana as oil producing plants had higher protein content (<25%). O. amentacea and M. angolensis had higher crude protein percent (14-34%) than other species. Crude fiber for all preferred species ranged from 9-27.6% on dry weight basis. The crude lipid content of preferred species ranged from 1.2% for fruit plants to 6.80% for oily plants. V. infausta and A. digitata had high Carbohydrates whereas all edible plants had higher values of Potassium and low Copper, Iron and Zinc content. A. digitata seeds had the highest value of Vitamin C (57.31 mg/100 dry weight) and low levels of tannins and phenols. This study concludes that wild plants are nutritious and have adequate nutrients and levels of anti-nutrients are below the toxic levels. Consequently, use of wild food plants could provide a possible source of food security in Iringa District.

Feyssa, DH, Njoka JT, Asfaw Z, Nyangito MM.  2011.  Wild Edible Fruits of Importance for Human Nutrition in Semiarid Parts of East Shewa Zone, Ethiopia: Associated Indigenous Knowledge and Implications to Food Security. Pakistan journal of Nutrition. 10(1):40-50. Abstract

Nutrient value assessments and ethnobotanical studies of three wild edible fruit species [Ziziphus spina-christi (L.) Desf., Balanites aegyptiaca (L.) Del., Grewia flavescens A. Juss.], were carried out from October 2009 through June 2010 in east Shewa Zone, Ethiopia. Field data collection was combined with laboratory food content analyses with the aim of identifying promising wild edible fruit plants. Also, optimal use of preferred wild edibles particularly in addressing future food security issues of rural people in the drylands was assessed. Composite fruit samples randomly collected in six sites of Fantalle and Boosast districts were subjected to standard laboratory chemical analyses. Values for total carbohydrates, crude protein, crude lipid, moisture and total ash contents of the fruit pulps ranged from 76.67-86.12%, 1.45-4.20%, 3.58-4.02%, 35.18-57.41%, 8.11-16.40% for Z. spina-christi, 85.55-89.61%, 0.001-003, 49.03-68.26%, 10.18-12.88% for B. aegyptiaca; 83.74-93.68%, 0.64-3.14%, 18.90-61.35%, 3.16-7.25% for G. flavescens, respectively. The calculated energy (based on total carbohydrates) was highest for G. flavescens (373.6 Kcal/100 g), followed by B. aegyptiaca (354.24) and Z. spina-christi (344.48 Kcal/100 g). The results indicated that these fruit species, which are popularly used by the local communities, contain appreciable amounts of nutrients and energy and thus are useful food supplements. These species should be integrated into dryland agroforestry systems for sustainable use and conservation, as well as, preservation of the associated knowledge through the positive practice of the indigenous bio-cultural knowledge. In this case, lessons can be drawn from some farmers of Boosat District, who are currently using two of the species in traditional agroforestry practices.

Feyssa, DH, JNT, Nyangito MM, Asfaw Z.  2011.  Neutraceutal Wild Plants of SemiArid East Shewa, Ethiopia: Contributions to Food and Healthcare Security of the Semiarid People. Research Journal of Forestry. 5(1):1-16. Abstract

Ethnobotanical study was conducted in six study sites of semi arid east Shewa, Ethiopia. The study has aimed to identify key nutraceutical wild plants and documents associated indigenous knowledge. It also analyzed local use and management practices and implications to food and health security of people living in semi arid areas. Data was obtained ethnobotanically by field observations, focus group discussions and interviews. Qualitatively data were described by narrating and quantitatively summarized in tables, percentages and ranking matrixs. Twenty nutraceutical plants were identified; 35% shrubs, 6% trees and 5% liana for human food, livestock feed and medicine. Transhumant pastoralists used (95%) nutraceuticals and settled farmers (65%). Twenty nutraceutical wild plants were used to treat 11(55%) human and 9(45%) livestock ailments/ health problems. There are a good number of nutraceutical plants which can be used for nutrition and healthcare system of semiarid people. Transhumant pastoralists were more intimate with nature and more knowledgeable. Hence, they adapt to climate change by using locally available nutraceuticals for themselves and their livestock. Climate change adaptation strategies can be built on this indigenous knowledge for sustainable use of nutracuticals for nutrition and health security

2010

Feyssa, DH, Njoka JT, Asfaw Z, Nyangito MM.  2010.  Analysis of multipurpose uses and management of Zizphus spina-christi (L.) desf. in semi-arid Ethiopia: Implications for food security. Second RUFORUM Biennial Meeting . Abstract

Quantitative ethnobotanical study of Ziziphus spina-christi
was undertaken in six areas of east Shewa, Ethiopia. Both
structured questionnaire and focus-group interviews were
conducted with about 200 households. Arable land cultivation,
and increased frequencies of drought are reducing areas under
Z. spina-christi. The multi-purpose tree is highly nutritious,
helps main soil fertility, and is an important source of income in
the region. Research and policy support are needed to exploit
the potential of this agroforestry tree species.
Key words: East Shewa, food security, nutrition, wild fruits,
Ziziphus spina-christi

Githae, W E, Gachene CKK, Njoka JT, Odee DW, Omondi SF.  2010.  Genefic Diversity of Gum Arabic-producing Acacia senegal Variefies in Kenya using Inter-Simple Sequence Repeat (ISSR) and Chloroplast Simple Sequence. Technical Centre for Agricultural and Rural Cooperation Journal. Abstract

Acacia senegal is a drought-tolerant, multi-purpose tree species, highly valued for gum arabic production and increasingly being used in agro-forestry in Sub-Saharan Africa. Despite its long history of use, there has not been exhaustive genetic evaluation of the extant genetic resource base of A. senegal in Kenya for genetic improvement of the species. Inter-simple sequence repeat (ISSR) and chloroplast microsatellite (cpSSR) markers were used to study genetic diversity among seven Kenyan populations of A. senegal embracing three putative varieties: kerensis, leiorhachis and senegal. The two marker types detected similar levels of Nei’s gene diversity (HISSR = 0.211, HcpSSR = 0.212) among the A. senegal populations. Acacia senegal var. kerensis exhibited the highest diversity using ISSR markers (HISSR = 0.248), followed by varieties leiorhachis (HISSR = 0.218) and senegal (HISSR = 0.151). Analysis of molecular variance (AMOVA) detected significant genetic variations within and among populations (P < 0.001 and P < 0.01 for ISSR and cpSSR, respectively). Based on the unweighted pair group method with arithmetic mean (UPGMA) dendrogram of the seven populations, two regions were differentiated (north and south). Both markers demonstrated their potential for delineating population structure at local and regional levels, and infra-specific relations within the species, hence their potential as tools for conservation, improvement programmes and sustainable use of the species. This study provides baseline genetic information for the domestication of A. senegal varieties in Kenya.

Feyssa, DH, Njoka JT, Nyangito MM, Asfaw Z.  2010.  Neutraceutal Wild Plants of SemiArid East Shewa, Ethiopia: Contributions to Food and Healthcare Security of the Semiarid People. Journal of Horticulture and Forestry. 3(1) Abstract

Ethnobotanical study was conducted in six study sites of semi arid east Shewa, Ethiopia. The study has aimed to identify key nutraceutical wild plants and documents associated indigenous knowledge. It also analyzed local use and management practices and implications to food and health security of people living in semi arid areas. Data was obtained ethnobotanically by field observations, focus group discussions and interviews. Qualitatively data were described by narrating and quantitatively summarized in tables, percentages and ranking matrixs. Twenty nutraceutical plants were identified; 35% shrubs, 6% trees and 5% liana for human food, livestock feed and medicine. Transhumant pastoralists used (95%) nutraceuticals and settled farmers (65%). Twenty nutraceutical wild plants were used to treat 11(55%) human and 9(45%) livestock ailments/ health problems. There are a good number of nutraceutical plants which can be used for nutrition and healthcare system of semiarid people. Transhumant pastoralists were more intimate with nature and more knowledgeable. Hence, they adapt to climate change by using locally available nutraceuticals for themselves and their livestock. Climate change adaptation strategies can be built on this indigenous knowledge for sustainable use of nutracuticals for nutrition and health security.

2006

THEURI, DRNJOKAJESSE, D. DRKINYUAPATRICKI.  2006.  J. T. Njoka and P.I.D. Kinyua, 2006: The Logistic Model-generated carrying capacities, maximum sustained off-take rates and optimal stocking rates for Kenya. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing Abstract
This paper deals with the derivation of logistic model for cattle, sheep and goats in a commercial ranching system in Machakos District, Kenya, a savannah ecosystem with average annual rainfall of 589.3  159.3mm and an area of 10,117ha. It involves modeling livestock population dynamics as discrete-time logistic equations wiyh fixed carrying capacities. The fixed carrying capacities are generated endogenously using time-series ranch data, covering a period of 15 years, from 1987 to 2001, in a commercial ranching enterprise. The model incorporates interaction parameters, generated endogenously. The estimation of the logistic models involves estimation of econometric models for each livestock species, followed by the recovery of the logistic model mathematically. Optimisation procedures are employed to determine the optimal stocking levels and the optimal off-take levels. The model-generated carrying capacities are 2,985, 791 and 201 animal units (AU) for cattle, sheep and goats, respectively. Optimal stocking levels are 1,369, 154 and 69 Aus for cattle, sheep and goats, respectively, while the optimal off-take levels are 857, 88 and 63 for cattle, sheep and goats, respectively. This shows that the logistic model-based system analysis is applicable to the management of mixed-species commercial ranching enterprises.

2005

THEURI, DRNJOKAJESSE.  2005.  G. W. Muriuki, T.J. Njoka, R.S. Reid, D.M. Nyariki 2005: Tsetse control and land-use change in Lambwe valley, south-western Kenya. Agriculture, Ecosystem and Environment 106 (2005) 99-107. Elsevier. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing Abstract
This paper deals with the derivation of logistic model for cattle, sheep and goats in a commercial ranching system in Machakos District, Kenya, a savannah ecosystem with average annual rainfall of 589.3  159.3mm and an area of 10,117ha. It involves modeling livestock population dynamics as discrete-time logistic equations wiyh fixed carrying capacities. The fixed carrying capacities are generated endogenously using time-series ranch data, covering a period of 15 years, from 1987 to 2001, in a commercial ranching enterprise. The model incorporates interaction parameters, generated endogenously. The estimation of the logistic models involves estimation of econometric models for each livestock species, followed by the recovery of the logistic model mathematically. Optimisation procedures are employed to determine the optimal stocking levels and the optimal off-take levels. The model-generated carrying capacities are 2,985, 791 and 201 animal units (AU) for cattle, sheep and goats, respectively. Optimal stocking levels are 1,369, 154 and 69 Aus for cattle, sheep and goats, respectively, while the optimal off-take levels are 857, 88 and 63 for cattle, sheep and goats, respectively. This shows that the logistic model-based system analysis is applicable to the management of mixed-species commercial ranching enterprises.

2003

Ndirima, ZK, Nyariki DM.  2003.  Tenure, livelihood and sustainable development: Rangelands as systems for multiple land use and livelihood support. AbstractWebsite

Conventional rangeland management has focused on optimisation of secondary production. Yet rangelands provide multiple goods and services at local and landscape scales. The diversity of resources available from rangelands underpins the livelihood security of developed and underdeveloped rural communities across all continents. This diversity of resources, and consequent livelihood options, is receiving greater recognition in management and research fora, whilst simultaneously offering greater opportunities for new and innovative uses of rangelands for subsistence and commercial needs. The session will appraise the diversity of rangeland resources used by rural communities and examine the viability and sustainability of different livelihood options within rangelands.

THEURI, DRNJOKAJESSE.  2003.  Njoka J. T. 2003: The Worship of God through Agriculture .Chapter 2 pages 19-40. In the Book . 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing Abstract
This paper deals with the derivation of logistic model for cattle, sheep and goats in a commercial ranching system in Machakos District, Kenya, a savannah ecosystem with average annual rainfall of 589.3  159.3mm and an area of 10,117ha. It involves modeling livestock population dynamics as discrete-time logistic equations wiyh fixed carrying capacities. The fixed carrying capacities are generated endogenously using time-series ranch data, covering a period of 15 years, from 1987 to 2001, in a commercial ranching enterprise. The model incorporates interaction parameters, generated endogenously. The estimation of the logistic models involves estimation of econometric models for each livestock species, followed by the recovery of the logistic model mathematically. Optimisation procedures are employed to determine the optimal stocking levels and the optimal off-take levels. The model-generated carrying capacities are 2,985, 791 and 201 animal units (AU) for cattle, sheep and goats, respectively. Optimal stocking levels are 1,369, 154 and 69 Aus for cattle, sheep and goats, respectively, while the optimal off-take levels are 857, 88 and 63 for cattle, sheep and goats, respectively. This shows that the logistic model-based system analysis is applicable to the management of mixed-species commercial ranching enterprises.
THEURI, DRNJOKAJESSE.  2003.  Muriuki G.W., and Njoka J.T., Reid, R. S.:2002: Tsetse, wildlife and land-cover change in Ruma National Park, South Western Kenya. J. Hum. Ecol., 14(4): 229-235 (2003) Kamla-Raj India. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing Abstract
This paper deals with the derivation of logistic model for cattle, sheep and goats in a commercial ranching system in Machakos District, Kenya, a savannah ecosystem with average annual rainfall of 589.3  159.3mm and an area of 10,117ha. It involves modeling livestock population dynamics as discrete-time logistic equations wiyh fixed carrying capacities. The fixed carrying capacities are generated endogenously using time-series ranch data, covering a period of 15 years, from 1987 to 2001, in a commercial ranching enterprise. The model incorporates interaction parameters, generated endogenously. The estimation of the logistic models involves estimation of econometric models for each livestock species, followed by the recovery of the logistic model mathematically. Optimisation procedures are employed to determine the optimal stocking levels and the optimal off-take levels. The model-generated carrying capacities are 2,985, 791 and 201 animal units (AU) for cattle, sheep and goats, respectively. Optimal stocking levels are 1,369, 154 and 69 Aus for cattle, sheep and goats, respectively, while the optimal off-take levels are 857, 88 and 63 for cattle, sheep and goats, respectively. This shows that the logistic model-based system analysis is applicable to the management of mixed-species commercial ranching enterprises.
THEURI, DRNJOKAJESSE.  2003.  T.J. Njoka, G.W. Muriuki, R.S. Reid and D.M. Nyariki: 2003: The Use of Sociological Methods to Assess Land-use Change: A Case Study of Lambwe Valley, Kenya. J. Soc. Sc., 7(3): 181-185 (2003). Kemla-Raj , India. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing Abstract
This paper deals with the derivation of logistic model for cattle, sheep and goats in a commercial ranching system in Machakos District, Kenya, a savannah ecosystem with average annual rainfall of 589.3  159.3mm and an area of 10,117ha. It involves modeling livestock population dynamics as discrete-time logistic equations wiyh fixed carrying capacities. The fixed carrying capacities are generated endogenously using time-series ranch data, covering a period of 15 years, from 1987 to 2001, in a commercial ranching enterprise. The model incorporates interaction parameters, generated endogenously. The estimation of the logistic models involves estimation of econometric models for each livestock species, followed by the recovery of the logistic model mathematically. Optimisation procedures are employed to determine the optimal stocking levels and the optimal off-take levels. The model-generated carrying capacities are 2,985, 791 and 201 animal units (AU) for cattle, sheep and goats, respectively. Optimal stocking levels are 1,369, 154 and 69 Aus for cattle, sheep and goats, respectively, while the optimal off-take levels are 857, 88 and 63 for cattle, sheep and goats, respectively. This shows that the logistic model-based system analysis is applicable to the management of mixed-species commercial ranching enterprises.
THEURI, DRNJOKAJESSE.  2003.  V.O. Wesonga, R.K. Ngugi, D.M. Nyariki, G. Kironchi and T. J. Njoka: 2003: Effects of Balanites glabra canopy cover on grass production, organic matter and soil moisture in Southern Kenya rangeland. African Journal of Range & Forage Science, 2003, 20(3): . 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing Abstract
This paper deals with the derivation of logistic model for cattle, sheep and goats in a commercial ranching system in Machakos District, Kenya, a savannah ecosystem with average annual rainfall of 589.3  159.3mm and an area of 10,117ha. It involves modeling livestock population dynamics as discrete-time logistic equations wiyh fixed carrying capacities. The fixed carrying capacities are generated endogenously using time-series ranch data, covering a period of 15 years, from 1987 to 2001, in a commercial ranching enterprise. The model incorporates interaction parameters, generated endogenously. The estimation of the logistic models involves estimation of econometric models for each livestock species, followed by the recovery of the logistic model mathematically. Optimisation procedures are employed to determine the optimal stocking levels and the optimal off-take levels. The model-generated carrying capacities are 2,985, 791 and 201 animal units (AU) for cattle, sheep and goats, respectively. Optimal stocking levels are 1,369, 154 and 69 Aus for cattle, sheep and goats, respectively, while the optimal off-take levels are 857, 88 and 63 for cattle, sheep and goats, respectively. This shows that the logistic model-based system analysis is applicable to the management of mixed-species commercial ranching enterprises.

2002

THEURI, DRNJOKAJESSE.  2002.  Atieno F.O. , Robin Reid and Njoka J.T. And E. Harris 2002: Land use trends and their effects on range vegetation; the case of Greater Amboseli Ecosystem: Paper presented at the Annual GL-CRSP Conference in Guadalajara, Mexico, 16th - 18th March 2002. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing Abstract
This paper deals with the derivation of logistic model for cattle, sheep and goats in a commercial ranching system in Machakos District, Kenya, a savannah ecosystem with average annual rainfall of 589.3  159.3mm and an area of 10,117ha. It involves modeling livestock population dynamics as discrete-time logistic equations wiyh fixed carrying capacities. The fixed carrying capacities are generated endogenously using time-series ranch data, covering a period of 15 years, from 1987 to 2001, in a commercial ranching enterprise. The model incorporates interaction parameters, generated endogenously. The estimation of the logistic models involves estimation of econometric models for each livestock species, followed by the recovery of the logistic model mathematically. Optimisation procedures are employed to determine the optimal stocking levels and the optimal off-take levels. The model-generated carrying capacities are 2,985, 791 and 201 animal units (AU) for cattle, sheep and goats, respectively. Optimal stocking levels are 1,369, 154 and 69 Aus for cattle, sheep and goats, respectively, while the optimal off-take levels are 857, 88 and 63 for cattle, sheep and goats, respectively. This shows that the logistic model-based system analysis is applicable to the management of mixed-species commercial ranching enterprises.

2001

THEURI, DRNJOKAJESSE, D. DRKINYUAPATRICKI.  2001.  Kinyua P.I.D and Njoka J. T. 2001: Animal Exchange Ratios: an alternative point of view. African Journal of Ecology Vol.: 39, 59-64. Blackwell. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing

1999

THEURI, DRNJOKAJESSE.  1999.  RELMA Technical Report No. 22 (ISBN 9966-896-42-2): 1999: . 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing

1995

1993

1992

THEURI, DRNJOKAJESSE.  1992.  R.W. Benjamin, N.G. Seligman, T. Kipnis, M. Forti, K. Becker, J. T. Njoka and NKR. Musimba, J.C. Ng. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing

1990

THEURI, DRNJOKAJESSE.  1990.  Njoka T. 1990: Range management in Kenya. Page 60-63: In Wildlife Research for sustainable Development.-Edited by G.T. Grootenhuis, S.G. Njuguna and P.W. Kat. Published by KARI, KWS, NMK. 4th International Congress of Cell Biology, Montreal, Canada 14-19 August, 1988. : Douglas McLean Publishing

1989

1986

1985

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