Meru University Institutional Repository: Recent submissions
Now showing items 341-360 of 1134
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Phylogenetic studies uncover a predominantly African lineage in a widely distributed lichen-forming fungal species
(MycoKeys, 2016)A number of lichen-forming fungal species are widely distributed. Here, we investigate biogeographic patterns in a widely distributed isidiate taxon –Parmelinella wallichiana – using molecular sequence data. Our results ... -
Molecular data show that Hypotrachyna sorocheila (Parmeliaceae) is not monophyletic
(The American Bryological and Lichenological Society, Inc, 2016)Lichens that reproduce by means of vegetative propagules (soredia or isidia) are generally thought to have broad geographic distributions. However, recent studies have shown that some asexually reproducing lichens with ... -
Diversity and Altitudinal Distribution of Understorey Corticolous Lichens in a Tropical Montane Forest in Kenya (East Africa).
(ResearchGate, 2017)Lichens constitute an important component of tropical forest biodiversity. This study inventoried corticolous lichens and examined their variation in various forest types with varying climatic conditions in Mt. Kenya, ... -
Isolation of haloalkaliphilic fungi from Lake Magadi in Kenya
(Heliyon, 2020)In this study we explored the cultivable fungal diversity in Lake Magadi and their secondary metabolite production. Isolation was done on alkaline media (Potato dextrose agar, Malt extract agar, Oatmeal agar and Sabouraud ... -
Polyphyly of the genus Canoparmelia—uncovering incongruences between phenotype-based classification and molecular phylogeny within lichenized Ascomycota (Parmeliaceae)
(PHYTOTAXA, 2016)Many phenotypical features traditionally used to classify genera in Parmeliaceae and in lichens in general have evolved several times independently, potentially limiting their taxonomic utility. Here, we aim to elucidate ... -
Molecular phylogenetic studies unmask overlooked diversity in the tropical lichenized fungal genus Bulbothrix s.l. (Parmeliaceae, Ascomycota)
(Botanical Journal of the Linnean Society, 2017)Species boundaries in lichen-forming fungi occurring in extra-tropical regions are relatively well studied in comparison with those in species distributed in tropical regions. Here, we aim to re-examine species boundaries ... -
Interferometry Analysis of Cellophane Birefringence
(Optics and Photonics Journal, 2013-10)This paper reports on a simple approach of determining the ability of a transparent material, such as cellophane to rotate the direction of polarization of a light beam. In order to determine the birefringence of such a ... -
Thermal Stress Monitoring on Piston Rings by Real Time Holographic Interferometry
(Scientific Research Publishing, 2013)In this paper, real time holographic Interferometry (RTHI) technique was used to monitor the thermal stress on the piston rings. The piston rings holograms were recorded and the holographic plate replaced on the holder ... -
Control of the polarization direction of isolated attosecond pulses using inhomogeneous two-color fields
(Nature Publishing Group, 2019)We theoretically demonstrate the control of the polarization direction of isolated attosecond pulses (IAPs) with inhomogeneous two-color fields synthesized by an 800-nm fundamental pulse and a 2000- nm control pulse having ... -
Influences of Ga Doping on Crystal Structure and Polarimetric Pattern of SHG in ZnO Nanofilms
(Nanomaterials, 2019-06-21)The second-harmonic generation (SHG) in gallium doped ZnO (GZO) nanofilms was studied. The Ga doping in GZO nanofilms influenced the crystal structure of the films, which affected SHG characteristics of the nanofilms. ... -
Influences of Ga doping on crystal structure and polarimetric pattern of SHG in ZnO nanofilms
(Multidisciplinary Digital Publishing Institute, 2019)The second-harmonic generation (SHG) in gallium doped ZnO (GZO) nanofilms was studied. The Ga doping in GZO nanofilms influenced the crystal structure of the films, which affected SHG characteristics of the nanofilms. In ... -
Generalized relativistic dynamics in a non-inertial reference frame
(Springer-Verlag, 2010)Generalized relativistic field equations have been derived for dynamics in a non-inertial reference frame interpreted as a Finsler space where events are specified by both spacetime coordinates and corresponding velocities ... -
Tuning the photoinduced charge transfer from CdTe quantum dots to ZnO nanofilms through Ga doping
(Elsevier, 2019)Tuning the charge transfer rate between quantum dots (QDs) and metal oxide (MO) is important for improving the performances of QDs-MO devices. And tailoring the energy band of MO is one way to tune the charge transfer rate. ... -
Gigahertz acoustic vibrations of Ga-doped ZnO nanoparticle array
(IOP Science, 2019)In this work, we present an experimental study on the acoustic vibrations of ZnO nanoparticles array with different concentration of Ga dopings by using femtosecond pump-probe technique. The Ga-doped ZnO (GZO) nano-triangle ... -
On The Existence of a Non-Relativistic Hermitian Time Operator
(2015)The existence of a hermitian time operator is proposed in the framework of non-relativistic quantum mechanics. The Heisenberg equation of motion is shown to yield constant rate of flow of time. It is shown to yield results ... -
Schwarzschild solution of the modified Einstein field equations
(2017)A reformulation of the Schwarzschild solution of the linearized Einstein field equations in post-Riemannian Finsler spacetime is derived. The solution is constructed in three stages: the exterior solution, the event-horizon ... -
Relativistic Dynamics in a Matter-Dominated Friedmann Universe
(Springer India, 2017)The energy density of the universe is estimated to be composed of 68% dark energy. Dark energy is associated with the accelerated expansion of the universe. In this work, we consider the evolution of the number density ... -
Monitoring and Supervision of Adult Basic Education: District Education Officers’ Dilemma in Machakos County of Kenya
(Scholars Academic and Scientific Publishers, 2017)The purpose of the study is to explore challenges facing District Adult and Continuing Education Officers (DACEO’s) in Monitoring and Supervision of Adult Basic Education in Machakos County in Kenya. The study used descriptive ... -
An Examination of the Factors that Shape the Engagement of Faculty Members and Academic Staff
(Springer, 2011)In this article we discuss some of the factors that influence how faculty members and academic staff at Michigan State University connect their scholarly activities to external audiences. Logistic regression was used to ... -
Fraud vulnerability of Kenya’s National Identity Card System
(2014)Modern crimes such as terrorism, money laundering and illegal immigration are majorly committed by individuals who falsify their identities by forging identification documents. One such document that is a target ...