Browsing School of Science and Computing (JA) by Title

Browsing School of Science and Computing (JA) by Title

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  • Multiple origins and a narrow genepool characterise the African tea germplasm: concordant patterns revealed by nuclear and plastid DNA markers 
    Wambulwa, Moses C.; Meegahakumbura, Muditha K.; Kamunya, Samson; Muchugi, Alice; Möller, Michael; Liu, Jie; Xu, Jian-Chu; Li, De-Zhu; Gao, Lian-Ming (Nature Publishing Group, 2017-06-22)
    Despite the highly economic value of tea in Africa, its genetic and geographic origins remain largely unexplored. Here we address this by collecting 439 samples across 11 countries in Africa and Asia to investigate the ...
  • Multiple plasmon resonances in small-sized citrate reduced gold nanoparticles 
    Ngumbi, Paul K.; Mugo, Simon W.; Ngaruiya, James M.; King’ondu, Cecil K. (Elsevier, 2019-05-15)
    Metallic nanoparticles exhibit localized surface plasmon resonances resulting from the coherent oscillation of free electrons in response to electric field from incident electromagnetic radiation. In this work, the dependence ...
  • Nano-size layered manganese–calcium oxide as an efficient and biomimetic catalyst for water oxidation under acidic conditions: comparable to platinum 
    King’ondu, Cecil K.; Najafpour, Mohammad M.; Leonard, Kevin C.; Fan, Fu-Ren F.; Tabrizi, Mahmoud A.; Bard, Allen J.; Suib, Steven L.; Haghighi, Behzad; Allakhverdiev, Suleyman I. (2013)
    Inspired by Nature's catalyst, a nano-size layered manganese–calcium oxide showed a low overvoltage for water oxidation in acidic solutions, which is comparable to platinum.
  • Nano-sized manganese oxide–bovine serum albumin was synthesized and characterized. It is promising and biomimetic catalyst for water oxidation 
    King’ondu, Cecil K.; Najafpour, Mohammad M.; Sedigh, Davood J.; Suib, Steven L. (2012)
    Nano-sized manganese oxide–bovine serum albumin was synthesized and characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), UV-vis, X-ray diffraction (XRD), infrared spectroscopy (FTIR), ...
  • Nanoscale manganese oxide octahedral molecular sieves (OMS-2) as efficient photocatalysts in 2-propanol oxidation 
    King’ondu, Cecil K.; Iyer, Aparna; Galindo, Hugo; Sithambaram, Shanthakumar; Chen, Chun-Hu; Suib, Steven L. (Elsevier, 2010-03)
    Crystalline tunnel structure cryptomelane type manganese oxides (OMS-2) have been studied as photocatalysts for the selective oxidation of 2-propanol to acetone. The reaction is carried out with visible light irradiation ...
  • Natural dyes for solar cell application: UV-visible spectra and outdoor photovoltaic performance 
    King’ondu, Cecil K.; Pamain, Adriano; Pogrebnaya, Tatiana (2014)
    Successful conversion of visible light into electrical output was achieved by using four locally available natural dyes as wide band gap semiconductor sensitizers in Dye sensitized solar cells. Natural dyes ...
  • Natural radioactivity and radiological hazard analysis of construction stones from various quarries in Machakos County-Kenya 
    Mutua, John O.; Linturi, James M.; Maweu, Onesmus M.; Kebwaro, Jeremiah M,.; Matsitsi, Muthama S. (2023-07-27)
    The radioactivity levels of rocks sampled from the quarries of Kyasioni, Mavoloni and Kathaana located in the lower Eastern County of Machakos in Kenya were determined. Forty-two samples were collected using stratified ...
  • Natural radioactivity levels of selected cement brands used in kenya using gamma ray spectroscopy 
    Mulwa, Vincent; Linturi, James M.; Riara, Martin M. (Science and Education Publishing, 2023)
    Cements contain traces of natural radionuclides because the raw materials originate from the earth’s crust. Elevated levels of natural radioactivity can have harmful health effects on living tissues. This study aimed at ...
  • The negative effects of the who covid-19 prevention guidelines on the human immune system 
    Kimatu, Josphert N. (Oriental Scientific Publishing Company, 2020)
    Currently there is little universal language on how practitioners can trace and treat the progression of the COVID-19 and also much less information on its impacts on the human immune system. The emerging results from such ...
  • Neuroprotective Effects of Tea Against Cadmium Toxicity 
    Karori, S. M.; Areba, G. O.; Ngure, R. M.; Khalid, R.; Maloba, F.; Nyaga, N.; Moseti, K. O.; Ngotho, M.; Wanyoko, J. K.; Wachira, Francis N. (2019)
    Background: Cadmium (Cd) is a common pollutant and potential neuro-toxicant to humans. The main treatment for heavy metal toxicity is chelation therapy which is however replete with grave side effects. This study was ...
  • Neutron Pairing Energy of Finite Nuclei 
    Masinde, Fred W. (2019-08-27)
    Neutron pairing energies of some of the finite nuclei have been calculated to understand how the neutron pairing changes as the neutron and proton numbers change from odd to even values in isotopes. How its value changes ...
  • Neutron Star and Its Properties 
    Masinde, Fred W.; Mukubwa, Abel (Scientific Research Publishing, 2020-07-09)
    Neutron stars are created due to the cataclysmic merger of two superdense stellar corpses. It is now evident that neutron-star smash-ups are the source of much of the universe’s gold platinum, uranium and other heavy ...
  • New biologically active compounds from Kenyan propolis. 
    Muli, Elliud; Petrova, Assya; Popova, Milena; Kuzmanova, Christina; Tsvetkova, Iva; Naydenski, Hristo; Bankova, Vassya (Elsevier, 2010-09)
    From propolis samples from Kenya, two new arylnaphtalene lignans were isolated, tetrahydrojusticidin B 1 and 6-methoxydiphyllin 2, along with four known phenolic compounds 5–8, found for the first time in propolis. The ...
  • New indirect immunofluorescence assay as a confirmatory test for human immunodeficiency virus type 1. 
    Ng'ang'a, Zipporah W.; Kiptoo, Michael K.; Mpoke, S. S. (Kenya Medical Association, 2004-05)
    BACKGROUND: Screening of blood and blood products for human immunodeficiency virus (HIV) is routinely performed using the enzyme-linked immunosorbent assay (ELISA), and the results confirmed by Western blot (WB). However, ...
  • A new isoflavanone from the stem bark of Erythrina latissima 
    Wanjala, Cornelius C.; Majinda, Runner R. T. (Elsevier, 2000-08-01)
    Two isoflavonoids — including the new compound 5,7-dihydroxy-2′,4′,5′-trimethoxyisoflavanone (1) — six flavanones and a feruloyl ester were isolated from the stem bark of Erythrina latissima.
  • A new measurement of the neutron detection efficiency for the NaI Crystal Ball detector 
    Martemianov, M.; Kulikov, V.; Demissie, B. T.; Marinides, Z.; Akondi, C. S.; Annand, J. R.; Arends, H. J.; Beck, R.; Borisov, N.; Braghieri, A.; Briscoe, W. J.; Cherepnya, S.; Collicott, C.; Costanza, S.; Downie, E. J.; Dieterle, M.; Ferretti Bondy, M. I.; Fil'kov, L. V.; Garni, S.; Glazier, D. I.; Glowa, D.; Gradl, W.; Gurevich, G.; Hornidge,D.; Huber, G. M.; Kaeser, A.; Kashevarov, V. L.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lazarev, A.; Linturi, James M.; Lisin, V.; Livingston, K.; MacGregor, I. J.; Manley, D. M.; Martel, P. P.; Middleton, D. G.; Miskimen, R.; Mushkarenkov, A.; Neganov, A.; Neiser, A.; Oberle, M.; Ostrick, M.; Ott, P.; Otte, P. B.; Oussena, B.; Pedroni, P.; Polonski, A.; Prakhov, S.; Ron, G.; Rostomyan, T.; Sarty, A.; Schott, D. M.; Schumann, S.; Sokhoyan, V.; Steffen, O.; Strakovsky, I. I.; Strub, Th.; Supek, I.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu.A.; Wagner, S.; Watts, D. P.; Wettig, J.; Werthmüller, D.; Witthauer, L.; Wolfes, M. (IOP Publishing, 2015-04)
    We report on a measurement of the neutron detection efficiency in NaI crystals in the Crystal Ball detector obtained from a study of single π0 photoproduction on deuterium using the tagged photon beam at the Mainz Microtron. ...
  • A new stilbene glycoside from Elephantorrhiza goetzei. 
    Wanjala, Cornelius C.; Majinda, Runner R. T. (Elsevier, 2001-08)
    A new stilbene glycoside, 5-methoxy-(E)-resveratrol 3-O-rutinoside (1) was isolated from the root bark of Elephantorrhiza goetzei, along with known compounds, namely gallic acid, (E)-resveratrol, (±)-catechin, (±)-gallocatechin ...
  • Next generation sound digital forensics architecture - a novel conceptual framework 
    Mogire, Obwaya (2016)
    Nothing epitomizes modern life better than the computer. For better or worse, computers have infiltrated every aspect of our society and for millions of people worldwide, the use of computers has become a central part of ...
  • Nonthermal synthesis of three-dimensional metal oxide structures under continuous-flow conditions and their catalytic applications 
    King’ondu, Cecil K.; Opembe, Naftali N.; Genuino, Homer C.; Garces, Hector F.; Njagi, Eric C.; Iyer, Aparna; Huang, Hui; Dharmarathna, Saminda; Suib, Steven L. (2011)
    Continuous-flow synthesis of one-dimensional (1D) metal oxide nanostructures and/or their integration into hierarchical structures under nonthermal conditions is still a challenge. In this work, a nonthermal, continuous-flow ...
  • A note on the joint essential numerical range of aluthge transform 
    Cyprian, O. S. (2018)
    Denote by T the bounded linear operator on a complex Hilbert space X and let T = U|T | be any polar decomposition of T with U a partial isometry and |T | = (T ∗T ) 1 2 . Then, the Aluthge transform Te of T is the operator ...

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