Publications

2019
Kigen G, Kamuren Z, Njiru E, Wanjohi B, Kipkore W. Ethnomedical Survey of the Plants Used by Traditional Healers in Narok County, Kenya. Evidence-Based Complementary and Alternative Medicine [Internet]. 2019;2019. DOIAbstract

Most of the plants used by herbalists amongst the various Kenyan communities have not been documented despite their widespread use. The purpose of this research was to document the medicinal plants used by the herbalists from the Maasai, a community that still relies on herbal medicine to a large extent for the provision of medical services. Semistructured interviews, direct observations, group discussions, and in-depth interviews were used to collect information from the traditional healers. A total of 47 plant species belonging to 31 families were identified. They were used in the treatment of 33 medical and 4 veterinary conditions.

PW Muchiri, VM Mwalukuku KKKGOANWM. Hardness characterization parameters of Niobium Carbide and Niobium Nitride: A first principles study. Materials Chemistry and Physics. 2019;229:489-494.Abstract

Niobium carbides and nitrides have been proposed as potential candidates for hardness and related applications, however, comprehensive studies are still needed for better understanding that may pave way for their re-engineering for the ultra hard industry. Here we present ab initio Density Functional Theory calculations that provide a comprehensive description of various hardness characterization parameters. Our results show that NbC in rocksalt (RS) had a higher shear modulusYoung's modulus, and Voigt-Reuss-Hill shear modulus compared to other phases of NbC and NbN considered in this work. Further, it was noted that NbC in RS had a higher value of Vickers hardness amongst the various phases NbC and NbN studied, thus identified as a potential candidate for hardness and related application. Finally, we showed that compounds with Vickers hardness (Hv) > 20 GPa were found to be brittle while those with Hv < 20 GPa were ductile.

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