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Publications


Submitted

N, PROFKAMAUGEOFREY.  Submitted.  The antihypertensive Effect of an extract from the Bark of Podocarpus Sp",. Submitted, East Africa Medical Journal. : Survey Review Abstract
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N, PROFKAMAUGEOFREY.  Submitted.  Accumulation of DDT residues in aquarium fish, sediment, plant and water," Accepted, J. Environment International.. Submitted to Journal of Electrochimica Acta. : Survey Review Abstract
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N, PROFKAMAUGEOFREY.  Submitted.  The Hypoglycoemic Effect of an Extract from the Bark of Podocarpus Sp", Submitted,. East Africa Medical Journal. : Survey Review Abstract
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N, PROFKAMAUGEOFREY.  Submitted.  Electrocatalytic decomposition of organohalides in microemulsion,". Submitted to Journal of Electrochimica Acta. : Survey Review Abstract
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N, PROFKAMAUGEOFREY.  Submitted.  Determination of Trace Elements in Medicinal Plants and Herbal Medicines. J. Phytochemistry, Submitted.. Electroanal. Chem., 17, 1984, 265.. : Survey Review Abstract
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2013

Wawire, MC, Jouvenot D, Loiseau F, Baudin P, Liatard S, Njenga L, Kamau GN, Casida ME.  2013.  Density-functional Study Of Luminescence In Polypyridine Ruthenium Complexes. Journal of Photochemistry and Photobiology A: Chemistry. Abstract

A density-functional theory (DFT) study of five ruthenium complexes has been carried out with the goal of gaining deeper insight into factors governing luminescence lifetimes. The five compounds are [Ru(bpy)3]2+ (1), [Ru(L1)2]2+ (2), [Ru(tpy)2]2+ (3), [Ru(L1)(tpy)]2+ (4), and [Ru(L2)2]2+ (5), where bpy = 2,2′-bipyridine, tpy = 2,2′;6′,2″-terpyridine, L1 = 1,1′-[2,6-pyridinediylbis(methylene)]bis[3-methylimidazolium] hexafluorophosphate and L2 = 1,1′-[2,6-pyridinediylbis(methylene)]bis[3-methylbenziimidazolium]. Experimental work, including the synthesis and photophysical properties of 5 is also reported in the context of this study. Gas phase geometries optimized using X-ray crystallography geometries as start geometries were found to be close to the start geometries. Gas phase absorption spectra calculated using time-dependent DFT were found to be in good agreement with spectra measured in solution. A partial density of states (PDOS) analysis of the molecular orbitals shows that it is possible to recover a ligand field theory (LFT)-like picture. On the basis of this PDOS-derived LFT-like picture we propose two orbital-based luminescence indices, both motivated by the idea that luminescence quenching results from a low 3MLCT → 3MC barrier. The first luminescence index is ΔE , the difference between the View the MathML sourceeg* and lowest energy π* PDOS bands. The second luminescence index is d × π, the product of the amount of π character in the t2g band with the amount of ruthenium d character in the 1π* band. These luminescence measures are intended as qualitative rather than quantitative predictors. Low values of ΔE and high values of d × π are shown to correlate with lack of luminescence for the five compounds studied in this paper, while high values of ΔE and low values of d × π correlate well with luminescence.

2012

2011

2010

2009

2005

N, PROFKAMAUGEOFREY.  2005.  Variation of palm oil with physico-chemical properties with temperature.. ELAEIS (The International Journal of Oil Palm Research and Development, Malaysia). Re-Submitted. THESES. : Survey Review Abstract
Towers are typical structures that can be found in many urban and rural landscapes the world over. From their basic design, they are usually exposed to severe environmental loads. It is therefore prudent to carry out periodic maintenance that includes checking that they are correctly aligned. This paper describes a method that was used for the re-alignment of a guyed tower in Limuru, Kenya. Angular and distance observations, made from two observation points detected a vertical misalignment that was larger than the acceptable tolerance of l/400. An iterative re-alignment procedure was then applied, resulting in an acceptable final misalignment of 1 / 520.

2004

N, PROFKAMAUGEOFREY.  2004.  Selective control and rate enhancement of reactions involving catalytic reduction of organohalides and reduced form of myoglobin in microemulsions, Pure Appl.. Chem., Vol. 76, No. 4, pp. 815-828, 2004.. : Survey Review Abstract
Towers are typical structures that can be found in many urban and rural landscapes the world over. From their basic design, they are usually exposed to severe environmental loads. It is therefore prudent to carry out periodic maintenance that includes checking that they are correctly aligned. This paper describes a method that was used for the re-alignment of a guyed tower in Limuru, Kenya. Angular and distance observations, made from two observation points detected a vertical misalignment that was larger than the acceptable tolerance of l/400. An iterative re-alignment procedure was then applied, resulting in an acceptable final misalignment of 1 / 520.

2003

N, PROFKAMAUGEOFREY.  2003.  Factors affecting yield of essential oil from Clevenger distillation of chamomile flowers",. Joseph M. Mwaniki and Geoffrey N. Kamau, International Journal of BioChemiPhysics, Vol.11&12(Nos.1&2) 2003.. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.
N, PROFKAMAUGEOFREY.  2003.  Spectroscopic Characterization and Distribution of tris(2,2. Journal of BioChemiPhysics, Vol. 11&12, No.3, 2003. : Survey Review Abstract
Towers are typical structures that can be found in many urban and rural landscapes the world over. From their basic design, they are usually exposed to severe environmental loads. It is therefore prudent to carry out periodic maintenance that includes checking that they are correctly aligned. This paper describes a method that was used for the re-alignment of a guyed tower in Limuru, Kenya. Angular and distance observations, made from two observation points detected a vertical misalignment that was larger than the acceptable tolerance of l/400. An iterative re-alignment procedure was then applied, resulting in an acceptable final misalignment of 1 / 520.
N, PROFKAMAUGEOFREY.  2003.  Mineralogy, Chemistry and Micromorphology of Ashes obtained from Sugar Cane Bagasse and Rice Husks from Kenya,. Journal of BioChemiPhysics, Vol. 11&13, No. 3, December 2003.. : Survey Review Abstract
Towers are typical structures that can be found in many urban and rural landscapes the world over. From their basic design, they are usually exposed to severe environmental loads. It is therefore prudent to carry out periodic maintenance that includes checking that they are correctly aligned. This paper describes a method that was used for the re-alignment of a guyed tower in Limuru, Kenya. Angular and distance observations, made from two observation points detected a vertical misalignment that was larger than the acceptable tolerance of l/400. An iterative re-alignment procedure was then applied, resulting in an acceptable final misalignment of 1 / 520.
N, PROFKAMAUGEOFREY.  2003.  Myoglobin Coadsorbed on Electrodes, Langmuir, Vol. 19, No. 17, 2003 6981.. Journal of BioChemiPhysics, Vol.11&12(Nos.1&2) 2003.. : Survey Review Abstract
Towers are typical structures that can be found in many urban and rural landscapes the world over. From their basic design, they are usually exposed to severe environmental loads. It is therefore prudent to carry out periodic maintenance that includes checking that they are correctly aligned. This paper describes a method that was used for the re-alignment of a guyed tower in Limuru, Kenya. Angular and distance observations, made from two observation points detected a vertical misalignment that was larger than the acceptable tolerance of l/400. An iterative re-alignment procedure was then applied, resulting in an acceptable final misalignment of 1 / 520.
N, PROFKAMAUGEOFREY.  2003.  Hypoglycemic and Hyperglycemic effects of Momordica charantia Fruit extracts,. Journal of BioChemiPhysics, Vol.11&12(Nos.1&2) 2003.. : Survey Review Abstract
Towers are typical structures that can be found in many urban and rural landscapes the world over. From their basic design, they are usually exposed to severe environmental loads. It is therefore prudent to carry out periodic maintenance that includes checking that they are correctly aligned. This paper describes a method that was used for the re-alignment of a guyed tower in Limuru, Kenya. Angular and distance observations, made from two observation points detected a vertical misalignment that was larger than the acceptable tolerance of l/400. An iterative re-alignment procedure was then applied, resulting in an acceptable final misalignment of 1 / 520.

2002

imsop, SJ, Kamau GN, Karuu SP.  2002.  Analysis of Heavy Metal Pollutants along Nairobi River..
N, PROFKAMAUGEOFREY.  2002.  Adsorption and detection of some phenolic compounds by rice husk ash of Kenyan origin", J. Environ. Monit., 4, 1-8.. Joseph M. Mwaniki and Geoffrey N. Kamau, International Journal of BioChemiPhysics, Vol.11&12(Nos.1&2) 2003.. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.

2001

N, PROFKAMAUGEOFREY.  2001.  Potentials of using waste burnt clay as a pozzolanic material in Kenya", Discov. Innov., 13, 114-118. Joseph M. Mwaniki and Geoffrey N. Kamau, International Journal of BioChemiPhysics, Vol.11&12(Nos.1&2) 2003.. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.
N, PROFKAMAUGEOFREY.  2001.  Status of Organochlorine (DDT) pollutants and steps toward electrocatalytic reductions", Pure Appl. Chem., Vol. 73, 1907-1916. Joseph M. Mwaniki and Geoffrey N. Kamau, International Journal of BioChemiPhysics, Vol.11&12(Nos.1&2) 2003.. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.

2000

N, PROFKAMAUGEOFREY.  2000.  Assessment of cottage-derived heavy metal pollution of soils. African Journal of Science and Technology, vol. 1, No. 2, 52-62 (2000). : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.
N, PROFKAMAUGEOFREY.  2000.  Potential antitermite compounds from Juniperus Procera Extracts, J. Chemosphere, 41, 1071.. Joseph M. Mwaniki and Geoffrey N. Kamau, International Journal of BioChemiPhysics, Vol.11&12(Nos.1&2) 2003.. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.

1999

N, PROFKAMAUGEOFREY.  1999.  Influence of surfactant-based microheterogeneous fluids on aggregation of copper phthalocyanine tetrasulfonate", J.. porphyrins phthalocyanine 3, 188-195, 1999.. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.
N, PROFKAMAUGEOFREY.  1999.  Variation of Plant DDT uptake with age and soil type ...", J.. Environment International, 25 (4), (1999).. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.
N, PROFKAMAUGEOFREY.  1999.  Assembly of electroactive ordered multilayer films of cobalt pthalocyanine tetrasulfonate and polycations, J.. colloid and Interface Science, 212, 570-575, 1999.. : Survey Review Abstract
Ground Flowers of Matricaria Recutita (German Chamomile) Banat Variety grown in Kenya, were subjected to Clevenger distillation under varying temperature, distillation, pressure conditions and the yields assessed. An inert solvent being present in the collecting column of the Clevenger apparatus increases the yield of the oil by reducing dispersion of the blue oil; its presence however, in the distillation flask inhibits the production of the essential oil. Distillation under reduced pressure leads to a decrease in the yield of the oil produced. A break in distillation time especially during the first three hours of distillation also leads to a decrease in the yield of the oil produced.

1998

Kinyua, AM, MANGALA MJ, GATEBE CK, Kamau GN, Kinyua AM, Kwach R, Mugera WG, Njau LN.  1998.  Suspended particulate matter in Nairobi and the impact on health.
N, PROFKAMAUGEOFREY, M PROFSHIUNDUPAUL, M PROFSHIUNDUPAUL.  1998.  Fuel value of Refined vernonia galamensis seed oil". J. Biochemphysics, 6&7, 33.. : Survey Review Abstract
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N, PROFKAMAUGEOFREY.  1998.  Extraction and spectroscopic Study of avocado oil, J. Biochemiphysics, 6&7, 36.. Sciences series A., 11 (1), 133.. : Survey Review Abstract
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