Maseno University

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Name

Dr. Wilson Okumu                                            

Picture:
Department

Department of Medical Biochemistry

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Address: Private Bag, Maseno- Kenya
Qualification:
  • PhD

Ongoing Research:

A phospholipid vesicle is a self-assembled biological material used for mimicking living cells for biomedical studies of biological membrane. A biological membrane plays a critical role in diverse biological processes. Previously, we utilized fluorescence imaging, optical tweezer and light scattering to determine the pore closing dynamics of GUVs of phospholipids vesicles of different composition and in the presence of cholesterol of varied concentrations. In this research, the line tension force in GUVs was found dependent on lipid composition. Currently, and with the support of our collaborators, we are interested investigations of reconstituted trans membrane proteins in liposomes. These studies will provide knowledge of the functional principles of these proteins in a purified, reconstituted system.



Publications:

 

 

 

 

 

 

 

 

  1. Sigunga, D.O., Kimura M., Hoshino, M., Asanuma, S. and Onyango, J.C. (2013) Root-fusion characteristic of Eucalyptus trees block gully development. Journal of Environmental Protection, 4(9): 877 – 880.
  2. Nina, D.O. and Sigunga, D.O. (2012)
    Effects of drying method, storage period and carbon:nitrogen ratio on inorganic nitrogen contents of Vertisols. African Journal of Environmental Science and Technology, 6(12): 476 – 482.
  3. Owino, C.O. and Sigunga, D.O. (2012).
    Effects of rainfall pattern and fertilizer nitrogen on nitrogen loss in bypass flow in Vertisols under tropical environments. Journal of Environmental Science and Water Resources, 1(9): 207 – 215.
  4. Sigunga, D.O., Hoshino, M., Onyango, J.C., Asanuma, S. and Kimura M. (2011) Pedological perspective of gully erosion sites within Kendu escarpment-Sondu Miriu region, west Kenya. African Journal of Environmental Science and Technology, 5(12):1050-1059.
  5. Sigunga, D.O. and Wandahwa, P. (2011)
    Land and soil resources and their management for sustainable agricultural production in Kenya: current position and future challenges. Egerton Journal of Science and Technology, 11: 66-86.
  6. Ogendo, R.O., Isutsa, D.K., and Sigunga, D.O. (2008). Integration of farmyard manure and plant population density effects on soil characteristics and productivity of mulched strawberry (Fragaria ananassa) in a Tropical climate. The African Journal of Horticultural Sciences, 1: 100-115.
  7. Sigunga, D.O., Janssen, B.H., and  Oenema, O. (2008).
    Effects of fertilizer nitrogen on short-term nitrogen loss in bypass flow in a Vertisol. Commun.Soil Sci. Plant Anal. 39(17): 2534 – 2549.
  8. Wasonga, C.J., Sigunga, D.O., and Musandu, A.O. (2008).
    Phosphorus requirement by maize varieties in different soil types of western Kenya. African Crop Science Journal, 16(2): 161 -173.
  9. Rota, J. A., Wandahwa, P. and Sigunga, D.O. (2006).
    Land Evaluation for Soybean (Glycine max L. Merrill) production based on kriging soil and Climate parameters for the Kakamega District, Kenya. Journal of Agronomy, 5(1): 142-250
  10. Sigunga, D.O. (2003).
    Potential Denitrification: Concept and conditions of its measurement. Commun. Soil Sci. PlantAnal., 34(17 & 18): 2405-2418
  11. Sigunga, D.O., Janssen, B.H., and Oenema, O. (2002).
    Denitrification risks in relation to fertilizer nitrogen losses from Vertisols and Phaoezems. Commun. Soil Sci. Plant Anal., 33(3 & 4): 561-578.
  12. Sigunga, D.O., Janssen, B.H., and Oenema, O. (2002).
    Ammonia volatilization from Vertisols. European J. Soil Sci., 53: 195-202.
  13. Sigunga, D.O., Janssen, B.H. & Oenema, O. (2002).
    Effects of improved drainage and nitrogen source on yields, nutrient uptake, and utilization efficiencies by maize (Zea mays L.) on Vertisols in sub-humid environments. Nutrient Cycling in Agroecosystems, 62: 263-275.
  14. Sigunga, D.O. (1993).
    Effects of nitrogen sources on growth and nutrient uptake by wheat, Agropyron, and their Hybrid grown in variable- and constant-pH culture solutions. Discovery and Innovation ,5(2):167-171.
  15. McColl, J.G., Waldren, R.P., Wafula, N.J. , and Sigunga D.O. (1991).
    Aluminum effects on six wheat cultivars in Kenya soils. Commun. Soil Sci. and Plant Anal., 22(15&16): 1701 -1719.
  16. Sigunga, D.O., Moritsugu, M. & Kawasaki, T. (1986).
    Effects of nutrient concentration in the medium on the growth and mineral uptake in wheat, Agropyron, and their hybrids. Kenya Journal of Science and Techn. Series B., 7 (i):4-6. 17.
  17. Sigunga, D.O. and Ngugi, D.N. (1985) The growth and yield of solanum potatoes in Kakamega District of Kenya. Kenya Journal of Science and Technology Series B., 6(2): 93 - 105.
  18. Muramatsu, M. and Sigunga, D.O., (1983). Amphiploid seed obtained by colchicine treatment of F1 hybrid between Triticum spelta and Agropyron intermedium. Scientific Report of the Faculty of Agriculture, Okayama University, 61: 1 - 3.