Publications


Submitted

Bojana Boh, David N. Kariuki, AKJMSWOO.  Submitted.  Development of New Products: International - Un iversity - Industry Cooperation: Camomile Project. : UNESCO - ICCS
D.N. Kariuki, PMC.  Submitted.  Explore Chemistry, Form 4.

2014

  2014.  SYNERGISTIC BIO-PESTICIDE COMBINATION OF PYRETHRINS AND ROTENOIDS. International Journal of Humanities, Arts,. 2(3):43-48. Abstract

Pyrethrins and Rotenoids extracts from Chrysanthemum cinerariaefolium and Tephrosia vogelii plants
respectively were combined at various ratio mixtures and tested against adult cockroach Americana periplaneta for their
efficacy. A mortality rate of 86% in 200 minutes with a synergistic ratio mixture of 28.5:1 w/w was established.
The mixture was found to have an observed LC50 of 0.23mg/g and a theoretical LC50 of 0.92mg/g calculated from the
individual Pyrethrins and Rotenoids extracts. The synergism expressed as co-toxicity coefficient CC, was found to be 4.
The photodegradation of Rotenoids in the combination was found to have a half life of t1/2 of 6.1hrs compared to that of
Rotenone and Pyrethrins of 3hrs respectively.

2007

Njenga, LW, Maina DM, Kariuki DN, Mwangi FK.  2007.  Aluminium exposure from vegetables and fresh raw vegetable juices in Kenya.

2005

2004

Kariuki D. K., KDN.  2004.  Selenium status of livestock in Koibatek District, Kenya. International Journal of BioChemiPhysics. 13 (2): :66-69.
and D.N. Kariuki, PMCAMN.  2004.  Explore Chemistry, Form 3.

2003

D.N. Kariuk i, J.Kithinji, PMCAMN.  2003.  . Explore Chemistry, Form 1.
and D.N. Kariuki, PMCAMN.  2003.  Explore Chemistry, Form 2.

2001

Kariuki, D.N..  2001.  The concept of Hybridisation.

1999

Kariuki, D.N., KDK.  1999.  Heavy metal Determination in Kenya's waters, .

1997

R.W. Kahama, KNDN & LW.  1997.  Effect of interfering ions on hexamethyldisiloxane microdiffusion method. Talanta. 44(10):1729-33. Abstract

Acid diffusion in the presence of hexamethyldisiloxane (HMDS) enables complete recovery of ionic fluoride from standards containing varying concentrations of aluminium as one of the main interfering ions. Acid diffusion without HMDS shows a decrease in fluoride recovery as aluminium ion concentration increases. The fluoride concentration in the trapping solution is determined directly on the diffusion cover with a combination fluoride electrode after neutralising and buffering. The same procedure was used for the analysis of fluoride in soil and plant materials containing high concentrations of aluminium ions. For the same samples, the concentrations of aluminium, iron and silicon were determined using atomic absorption spectrophotometer (AAS).

" R.W. Kahama, D.N.Kariuki, KNHN & LW.  1997.  Fluorosis in children and sources of fluoride around Lake Elementaita Region of Kenya. Fluoride. 30(1):19-25. Abstract

During a project to determine the fluoride levels of milk in Lake
Elementaita region, the authors were astonished by the high levels of fluorosis in
children living in the area. With special reference to children, a study was
designed to establish and describe the levels of dental fluorosis and also to
determine other sources of fluoride to the community. The levels of dental
fluorosis were recorded using Thylstrup and Fejerskov classification method
(TF) for children aged between 2-14 years. Biodata information, feeding habits
and details of fluoride history were collected using a questionnaire form filled out
with the help of teachers and/or parents.
Results pertain to both continuous and non-continuous residents for both
primary and permanent dentition. The high fluorosis level of 95.8% was associated
with the fluoride concentration in the community water supply and food.
Food samples analysed for fluoride include cows milk (the major source of
nutrients for the children in the area), vegetables and water. Fluoride levels in
drinking water from different boreholes were high, varying from 2.0-20.9 pg/mL-1.
Milk fluoride levels in samples from seven localities ranged from 0.05-0.22
pg/mL-1 (mean) and an individual animal range of 0.02-0.34 pg/g-1 . Vegetables
had fluoride levels between 7.9-59.3 pg/g-1 with an exception of one with 296.6
pg/g-1 . The soils in which the vegetables are grown had over 1000 ppm. This
being a landscape formed by the process of faulting and volcanic activity, the
dust from Lake Elementaita also had high fluoride concentration of 2300 pg/g-1.
Key words: Dental fluorosis; Fluoride sources; Kenya; Milk; Water.

1996

1995

R.W. Kahama, D.N. Kariuki & L.W. Njenga.  1995.  Comparison of two microdiffusion methods used to measure ionizable fluoride in cow's milk. Analyst. (2245 ):120.

1994

", L.W. Njenga and D.N. Kariuki.  1994.  Accumulation of Fluoride by Plants and Vegetables. International Journal of BioChemiPhysics.

1992

Githure, JI, Kabiru EW, Martin SK, Khan B, Ofulla AV, Kariuki DM.  1992.  Drug sensitivity studies during a highland malaria epidemic in Kenya. Website

1984

1983

D.N. Kariuki, TNHM & LW.  1983.  Dietary sources of fluoride in Kenya.

1982

H.M. Thairu, KNDN & LW.  1982.  The distribution of fluoride in Kenya waters.

1979

D.C. Munasighe, A.H.S. Elbusaidy, KMDNNB.  1979.  The development of the Solar Industry in Kenya.
D.N. Kariuki, A.H.S. Elbusaidy, MTMHM.  1979.  Production of salt at Lake Magadi and possible improvements.

1978

and Kettle, KDNSFA.  1978.  Vibrational Spectra of mixed isotopic crystals of manganese and rhenium pentacarbonyl iodides. Inorganic Chemistry. :17-1018.
D.N. Kariuki and S.F.A. Kettle, IC.  1978.  Raman Spectra of mixed crystals of transition metal hexacarbonyls.
Dr. Molepo, PKDN.  1978.  Polymorphism of calcium carbonate. FC.D.

1977

and Kettle, KDNSFA.  1977.  "The vibrational Spectra of mixed crystals of (C6H5)3PMxM1- x(CO)5, where M, M = Cr, Mo, W.". Journal of Raman Spectroscopy, 6, 319.

1976

D.N. Kariuki and S.F.A. Kettle, & Ti Soi Sang.  1976.  Vibrational Spectra of molecular crystals of impure metal carbonyls".

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