Publications


2013

2012

Angeyoa, KH, Garib S, Mustapha AO, Mangala JM.  2012.  Feasibility for direct rapid energy dispersive X-ray fluorescence (EDXRF) and scattering analysis of complex matrix liquids by partial least squares. AbstractWebsite

The greatest challenge to material characterization by XRF technique is encountered in direct trace analysis of complex matrices. We exploited partial least squares (PLS) in conjunction with energy dispersive X-ray fluorescence and scattering (EDXRFS) spectrometry to rapidly (200 s) analyze lubricating oils. The PLS–EDXRFS method affords non-invasive quality assurance (QA) analysis of complex matrix liquids as it gave optimistic results for both heavy- and low-Z metal additives. Scatter peaks may further be used for QA characterization via the light elements.

2011

2005

KALAMBUKA, DRANGEYOHUDSON.  2005.  Trace Element Analysis by Sliding Spark Spectrometry. J. Anal. Atom. Spectrom. (in press) 2005.. : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.
KALAMBUKA, DRANGEYOHUDSON.  2005.  Plasma-Radiative Modelling and Characterisation of the Sliding Spark Discharge: Implications for Direct Dielectric Solid Trace Quantitative Spectroscopy.. J. Radiative & Quantit. Spectres. (In Press), 2005.. : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.
KALAMBUKA, DRANGEYOHUDSON.  2005.  Spectral diagnostics of the sliding Spark plasma. J. Anal. Atom. Spectrom. (in press) 2005.. : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.

2002

KALAMBUKA, DRANGEYOHUDSON.  2002.  Sliding spark spectroscopy of sediment samples.. J. Anal. Bioanal. Chem., 374, 756 . : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.
KALAMBUKA, DRANGEYOHUDSON.  2002.  Sliding spark spectrometry: A pulsed plasma technique for the direct trace element analysis of non-conducting solids and dielectric surface layers.. Proceedings of the 2 nd International School on Plasma Diagnostics & Technology, 4 . : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.

1998

J., MRMANGALAMICHAEL, P PROFPATELJAYANTI, KALAMBUKA DRANGEYOHUDSON.  1998.  Radio Isotope Photon Excited Energy Dispersive X-ray Fluorescence Technique for the Analysis of Organic Matrices. X-ray Spectrometry, Vol. 27, 205 . : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.
KALAMBUKA, DRANGEYOHUDSON, P PROFPATELJAYANTI.  1998.  Measurements of trace elements levels in Kenyan cigarettes with energy dispersive X-ray fluroscence spectroscopy technique. J. Trace & Microprobe Techniques, Vol. 16, No.2, 233 . : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.
P, PROFPATELJAYANTI, KALAMBUKA DRANGEYOHUDSON.  1998.  Optimization of X-ray Fluorescence Elemented analysis.. An example from Kenya Applied Radiation & Isotopes, 49, 885 . : GIGA German Institute of Global and Area Studies, Hamburg, July 2009 Abstract
A preliminary study of microbiological quality of honey was carried out using 26 samples obtained from the National Bee Keeping Research Station. Total viable counts (TVC) of aerobic bacteria, yeasts and moulds, and Clostridium species were done. Of the 26 samples, 24 (92.3%) had a TVC ranging from 3 x10 -87 x 10 colony forming units (cfu) per gram of honey. Two samples did not yield any microorganisms. Of the 24 positive samples, 9 (37.5%) were found to contain Clostridium species per gram while eight (33.3%) were positive for moulds with counts ranging from 10-100 c.f.u / g. No yeasts were detected. In addition, three samples yielded the three types of microorganisms.

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