Bio

PROFILE

DR FRANCIS NYONGESA WANJALA

Senior Lecturer, Department of Physics, University of Nairobi, Kenya

PROFILE

Material scientist with research experience in the following areas:

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Publications


2015

Nguu, JN, Nyongesa FW, Aduda BO, Musembi RJ, Njogu S.  2015.  Electrical Characterization of Nano-TiO2/Nb2O5 Composite Thin Films Deposited Using Electrophoretic Deposition Technique. International Journal of Innovative Research in Advanced Engineering (IJIRAE). 2(2):2349-2163.nguu_and_nyongesa_publication_2015.pdf

2014

Nguu, J, Nyongesa FW, Aduda BO, Musembi RJ.  2014.  Effect of Process-Related Parameters on Band Gap of Electrophoretically Deposited TiO2/Nb2O5 Composite Thin Films. . African Journal of Physical Sciences. Volume [1], (June 2014 ):43-49.
Nguu, JN, Robinson Musembi, Nyongesa F, Aduda B.  2014.  Electrophoretic deposition of Ti02/Nb20S composite electrode thin films for photovoltaic application. Journal of Energy and Power Engineering. 8(2014):757-764.epd_of_titanium_and_niobium_for_photovoltaics.pdf

2013

F.W, N, B.O A, Hilonga.  2013.  Organic Binders To enhance Fuel Efficiency Of Charcoal Stoves (JIKOS) and in Water Filters, December 2013. 7TH International Conference of the Africa Materials research Society (A-MRS). , Addis Ababa, Ethopiajuami_conference_presentation_2013.pdf
Ismaiel, Y, Anand P, Megan L, Karen M, C. FK, Sam O, Nyongesa S, Francis Maiga, H. A, O SAB, Stefanos L, Wole S, M ASCE.  2013.  Porosity, Flow, and Filtration Characteristics of Frustum-Shaped Ceramic Water Filters. Journal of Environmental Engineering.
Nyongesa, FW.  2013.  Practical Physics I. , Nairobi: University of Nairobi-CODL

2012

Nyongesa, FW, Patel JP.  2012.  Practical Physics II. , Nairobi: University of Nairobi, CODL

2011

Nyongesa, FW, Aduda BO, Soboyejo WO, Obwoya SK, Rahbar N, Zimba J.  2011.  An Investigation of Thermal Shock in Porous Clay Ceramics. ISRN Mechanical Engineering. DOI 10.5402/2011/816853(816853)thermal_shock_in_porous_clay_ceramics_2011.pdf

2010

Nyongesa, FW, Aduda BO, Rahbar N, Obwoya SK, Zimba J, Yakub I, Soboyejo WO.  2010.  Thermal Shock Resistance of a Kyanite-Based (Aluminosilicate) Ceramic. Experimewntal Mechanics. DOI 10(April 2010): Society of Experimental Mechanics AbstractWebsite

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Clematis brachiata Thunberg (Ranunculaceae) is used in Kenya for the management of headaches, malaria and other febrile illnesses, abdominal disorders, yaws and for skin disorders.  Old stems and leaves are chewed for the management of toothaches and sore throats. 
Extracts of the plant were subjected to tests for antimalarial, antibacterial and antifungal activity.  The toxicity of the extracts was assessed using the brine shrimp lethality bioassay.
 
The root extract gave the highest in vitro antimalarial activity against a mulitidrug resistant strain, Plasmodium falciparum VI/S (IC50=39.24 mg/ml). The stem and leaf extracts had insignificant antiplasmodial activity.  The leaf, stem and root extracts had bacterial or fungal growth even at very high concentrations of 10 mg/ml. The LD50 values of the stem and leaf methanol extracts against the brine shrimp larvae was 365.60 and 66.5 mg/ml respectively.
The in vitro anti malarial activity of the root extract in part supports the ethnobotanical use of the plant to manage malaria.
 KEY WORDS
Clematis, Ranunculaceae, antimalarial, brine shrimp, antimicrobial

2008

Nyongesa, FW, Aduda BO, Njogu SM.  2008.  Effect of Plant Derived Organic Binders on The Mechanical Properties of Kaolin - Based Refractories. Journal of Material Science., 43, 4107 - 4111.. 43:4107-4111.: Journal of Material Science., 43, 4107 - 4111. AbstractWebsite

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Clematis brachiata Thunberg (Ranunculaceae) is used in Kenya for the management of headaches, malaria and other febrile illnesses, abdominal disorders, yaws and for skin disorders.  Old stems and leaves are chewed for the management of toothaches and sore throats. 
Extracts of the plant were subjected to tests for antimalarial, antibacterial and antifungal activity.  The toxicity of the extracts was assessed using the brine shrimp lethality bioassay.
 
The root extract gave the highest in vitro antimalarial activity against a mulitidrug resistant strain, Plasmodium falciparum VI/S (IC50=39.24 mg/ml). The stem and leaf extracts had insignificant antiplasmodial activity.  The leaf, stem and root extracts had bacterial or fungal growth even at very high concentrations of 10 mg/ml. The LD50 values of the stem and leaf methanol extracts against the brine shrimp larvae was 365.60 and 66.5 mg/ml respectively.
The in vitro anti malarial activity of the root extract in part supports the ethnobotanical use of the plant to manage malaria.
 KEY WORDS
Clematis, Ranunculaceae, antimalarial, brine shrimp, antimicrobial

2007

Nyongesa, FW, Aduda BO, Nyaga WG.  2007.  Electrophoretic Deposition (EPD) of Materials and its Applications, 25 jan 2007. 6TH EDWARD BOUCHET-ABDUS SALAM INSTITUTE INTERNATIONAL CONFERENCE. , iThemba LABS, Cape Town, South Africa: iThemba LABS, Cape Town Abstract

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Clematis brachiata Thunberg (Ranunculaceae) is used in Kenya for the management of headaches, malaria and other febrile illnesses, abdominal disorders, yaws and for skin disorders.  Old stems and leaves are chewed for the management of toothaches and sore throats. 
Extracts of the plant were subjected to tests for antimalarial, antibacterial and antifungal activity.  The toxicity of the extracts was assessed using the brine shrimp lethality bioassay.
 
The root extract gave the highest in vitro antimalarial activity against a mulitidrug resistant strain, Plasmodium falciparum VI/S (IC50=39.24 mg/ml). The stem and leaf extracts had insignificant antiplasmodial activity.  The leaf, stem and root extracts had bacterial or fungal growth even at very high concentrations of 10 mg/ml. The LD50 values of the stem and leaf methanol extracts against the brine shrimp larvae was 365.60 and 66.5 mg/ml respectively.
The in vitro anti malarial activity of the root extract in part supports the ethnobotanical use of the plant to manage malaria.
 KEY WORDS
Clematis, Ranunculaceae, antimalarial, brine shrimp, antimicrobial

2006

Nyongesa, FW, Aduda BO, Ogacho AA.  2006.  Thermal Shock Behaviour of a Kaolinite Refractory prepared using a Natural Organic Binder.. Journal of Material Science., 41, 8276 - 8283.. 41:8276-8283.: Journal of Material Science., 41, 8276 - 8283. AbstractWebsite

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Clematis brachiata Thunberg (Ranunculaceae) is used in Kenya for the management of headaches, malaria and other febrile illnesses, abdominal disorders, yaws and for skin disorders.  Old stems and leaves are chewed for the management of toothaches and sore throats. 
Extracts of the plant were subjected to tests for antimalarial, antibacterial and antifungal activity.  The toxicity of the extracts was assessed using the brine shrimp lethality bioassay.
 
The root extract gave the highest in vitro antimalarial activity against a mulitidrug resistant strain, Plasmodium falciparum VI/S (IC50=39.24 mg/ml). The stem and leaf extracts had insignificant antiplasmodial activity.  The leaf, stem and root extracts had bacterial or fungal growth even at very high concentrations of 10 mg/ml. The LD50 values of the stem and leaf methanol extracts against the brine shrimp larvae was 365.60 and 66.5 mg/ml respectively.
The in vitro anti malarial activity of the root extract in part supports the ethnobotanical use of the plant to manage malaria.
 KEY WORDS
Clematis, Ranunculaceae, antimalarial, brine shrimp, antimicrobial

2004

Nyongesa, FW, Aduda BO.  2004.  Fracture Strength of Porous Ceramics: Stress Concentration versus Minimum Solid Area Models. African Journal of Science and Technology. 5(1):19-27.stress_concentration_vs_min_solid_area.pdf
Nyongesa, FW, Aduda BO.  2004.  The Effect of Quartz and Mullite Phases on Strength of Triaxial Porcelain. East African Journal of Physical Sciences. 5(1):11-24.

2003

Nyongesa, FW, Aduda BO, Ogacho AA.  2003.  Thermal Conductivity of a Kaolinite Refractory; Effects of an Orgarnic Binder. Journal of Material Science. 38(11):2293-2297.: Journal of Material Science., 38[11], 2293 - 2297. AbstractWebsite

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Clematis brachiata Thunberg (Ranunculaceae) is used in Kenya for the management of headaches, malaria and other febrile illnesses, abdominal disorders, yaws and for skin disorders.  Old stems and leaves are chewed for the management of toothaches and sore throats. 
Extracts of the plant were subjected to tests for antimalarial, antibacterial and antifungal activity.  The toxicity of the extracts was assessed using the brine shrimp lethality bioassay.
 
The root extract gave the highest in vitro antimalarial activity against a mulitidrug resistant strain, Plasmodium falciparum VI/S (IC50=39.24 mg/ml). The stem and leaf extracts had insignificant antiplasmodial activity.  The leaf, stem and root extracts had bacterial or fungal growth even at very high concentrations of 10 mg/ml. The LD50 values of the stem and leaf methanol extracts against the brine shrimp larvae was 365.60 and 66.5 mg/ml respectively.
The in vitro anti malarial activity of the root extract in part supports the ethnobotanical use of the plant to manage malaria.
 KEY WORDS
Clematis, Ranunculaceae, antimalarial, brine shrimp, antimicrobial

2001

Nyongesa, FW, Aduda BO.  2001.  Ultrasonic Attenuation in Clay Refractories. Discovery and Innovation. 13(1/2):39-47.

2000

Nyongesa, FW, Aduda BO.  2000.  Effect of Crystalline Phases on Strength of Quartz-Kaolin-Feldspar Porcelain. Proceedings of 5th Regional Workshop on Material Science and device Technology. :51-56., Nairobi, Kenya: University of Nairobi
Nyongesa, FW, Aduda BO.  2000.  Effect of Silica Additions on Strength and Elastic Modulus of Kenyan Industrial Clay Ceramics. African Journal of Science. 2(2):77-89.
Nyongesa, FW, Aduda BO.  2000.  The Role of Aspect Ratio in the Elastic Modulus-Porosity Relationship of a Triaxial Porcelain. Journal of British Ceramic Transactions. 99(5):206-211.

1999

Nyongesa, FW, Aduda BO.  1999.  Effect of Sintering Temperature on Material Properties of Kenyan Industrial Clay Ceramics. Regional Conference on Material Science. :96-110., Kampala, Uganda: Makere University
Nyongesa, FW, Aduda BO.  1999.  Ultrasonic Attenuation in Kenyan Clay Refractories. British Ceramic Transactions. 98(6):266-270.
Nyongesa, FW, Aduda BO, Obado G.  1999.  Improving the Green and Fired Fracture Strength of a Kaolinite Ceramic Using some Vegetable Syrup. Journal of Material Science Letters. 18:1653-1655.

1995

Nyongesa, FW, Aduda BO.  1995.  An Ultrasonic Nondestructive Evaluation of Clay Refractories. African Journal of Science and Technology AJST. 7 Series B(2):53-57.

1994

Nyongesa, FW, Aduda BO.  1994.  Ultrasonic Characterization of Kenyan Clay Refractories. Proceedings of 1st African Regional Conference on Non-Destructive Testing. :32-35., Nairobi, Kenya: NDT Society of Kenya
Nyongesa, FW.  1994.  Ultrasonic Characterization of Kenyan Clay refractories. , Nairobi: University of Nairobi

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