School of Biological and Physical Science: Recent submissions
Now showing items 621-640 of 933
-
Resistance of Coffea arabica cv. Ruiru 11 tested with different isolates of Colletotrichum kahawae, the causal agent of coffee berry disease
(Springer Netherlands, 2001-08-01)Seven single conidia isolates of Colletotrichum kahawae varying in pathogenicity were used to inoculate hybrid progenies from 66 crosses ofCoffea arabica cv. Ruiru 11. The objective of this study was to investigate the ... -
Reactions of Methyl Iodide and Halopropanes with Na0 Treated and Untreated NaX and NaY Zeolites
(Cambridge University Press, 2005)Products formed from reactions of methyl iodide, 1-chloropropane, 1-iodopropane and 1-bromopropane with Na0 treated and untreated NaX and NaY zeolites were studied using solid state 13C NMR and IR spectroscopy. At room ... -
Effects of Possible Spin-Spin Interactions on EPR spectra of Cu2+ exchanged Faujasite–X (I)
(Cambridge University Press, 2005)The interpretation of the continuous wave electron paramagnetic resonance (CW-EPR) spectra of Cu2+ exchanged in Faujasite zeolite is not straightforward. Recent literature points to the role of both Cu2+ zeolite sites and ... -
Spectroscopic characterization of the metal cation siting and the adsorbate-cation interactions in copper (II) and cobalt (II) exchanged faujasite-X zeolite
(State University of New York at Binghamton, 2006)Toxic chemicals are abundant in the environment and their detection often requires very costly and time consuming methods. Where such molecules are able to interact with the transition metal cations, their characteristic ... -
Sodium X-type faujasite zeolite decomposition of dimethyl methylphosphonate (DMMP) to methylphosphonate: Nucleophilic zeolite reactions I
(Elsevier, 2006-06-20)Dimethyl methylphosphonate (DMMP), used extensively as a nerve agent simulant, strongly adsorbs in X-type faujasite zeolite and undergoes nucleophilic substitution by the supercage oxygens. Solid state magic angle spinning ... -
Linear, primary monohaloalkane chemistry in NaX and NaY faujasite zeolites with and without Na0-treatment: Zeolites as nucleophilic reagents II
(Elsevier, 2006-06-20)This work undertakes, we believe for the first time, a study of the chemistry of alkyl halides in Na0 treated zeolites. It concludes that untreated zeolites do nucleophilic chemistry to the degree that the host is electron ... -
Effects of cation siting and spin–spin interactions on the electron paramagnetic resonance (EPR) of Cu2+ exchanged X Faujasite zeolite
(North-Holland, 2006-11-21)Copper(II) exchanged Na X Faujasite zeolite was cation exchanged at levels from one Cu(II) in 30 unit cells (0.033 Cu(II)/UC) to 38 Cu(II) per unit cell (38 Cu/UC) and was examined by continuous wave and two-pulse and ... -
Effects of copper exchange levels on complexation of ammonia in Cu (II)-exchanged X zeolite
(The South African Chemical Institute, 2010)Copper (II)-exchanged faujasite-X zeolites at various loadings of copper per unit cell of zeolites were prepared and then exposed to ammonia. The copper ammine complexes of the various copper levels per unit cell were ... -
Sensoring Gaseous Ammonia using Cation Exchanged Faujasite-X Zeolite
(International Journal of BioChemiPhysics,, 2010)work presents a method that uses cheap, thermally stable and reusable cation exchanged solid zeolites to detect gaseous ammonia. Here, 24 separately exchanged Cu2+ and Co2+ cations per unit cell of 1.23 Si/Al Faujasite-X ... -
Optimizing Zeolitic Catalysis for Environmental Remediation
(John Wiley & Sons, Inc., 2015-05-01)This chapter discusses the effects of chemical and physical properties of zeolites as they affect the catalytic efficacy and applications of the zeolites in environmental remediation. Heterogeneous catalysts, where zeolites ... -
Effects of copper exchange levels on complexation of ammonia in Cu (II)-exchanged X zeolite
(Sabinet, 2010-01-01)Copper (II)-exchanged faujasite-X zeolites at various loadings of copper per unit cell of zeolites were prepared and then exposed to ammonia. The copper ammine complexes of the various copper levels per unit cell were ... -
AN ASSESSMENT OF PUBLIC WATER FACILITIES IN RURAL AREAS OF OYO STATE, NIGERIA
(University of Ibadan,, 2019-09-05)This study investigates public water facilities in Rural Areas of Oyo State. Multistage sampling was used to select 144 respondents from 3 Rural Local Governments in Oyo State. The availability, conditions, access, ... -
Effects of copper exchange levels on complexation of ammonia in Cu (II)-exchanged X zeolite
(Sabinet, 2010-01-01)Copper (II)-exchanged faujasite-X zeolites at various loadings of copper per unit cell of zeolites were prepared and then exposed to ammonia. The copper ammine complexes of the various copper levels per unit cell were ... -
Errors in parameters estimation using linearized adsorption isotherms: sulfadimethoxine adsorption onto kaolinite clay
(Chemical Science International Journal, 2018-08-29)In this work, an isothermal investigation of the adsorption of sulfadimethoxine from aqueous solution onto clay mineral (kaolinite) using batch equilibration method is reported. The equilibrium data were modelled using ... -
Single and binary adsorption of sulfonamide antibiotics onto iron-modified clay: linear and nonlinear isotherms, kinetics, thermodynamics, and mechanistic studies
(Springer International Publishing, 2018-10-01)Iron-modified raw kaolinite clay (Fe-MC) was synthesized by co-precipitation method, characterized, and then applied as a low-cost adsorbent to sequester sulfachloropyridazine (SCP) and sulfadimethoxine (SDM), emergent ... -
Preparation and Application of Biochars for Organic and Microbial Control in Wastewater Treatment Regimes
(IGI Global, 2019)Biochars have been extensively applied in soil remediation, carbon sequestration, and in climate change mitigation. However, in recent years, there has been a significant increase in biochar research in water treatment due ... -
Field transmission efficiency of Alternaria sesami in sesame from infected seed
(Elsevier, 2003-11-30)Four sesame accessions with varying levels of susceptibility to Alternaria sesami were selected from an advanced germplasm collection of the Sesame Improvement Project to determine transmission efficiency of A. sesami from ... -
Comparison of S2 and S2 X test cross evaluation for the selection in maize
(KARI, 2004)S2 and S2 1testcross hybrid evaluation for one cycle of selection for resistance to the spotted stem borer, (Chilo partellus Swinhoe) and grain yield were made in an open-pollinated maize (Zea mays L) population (ICZ3) One ... -
Inheritance of resistance to the spotted stem borer, chilo partellus, in a maize population.
(Kenya Agricultural Research Institute, Nairobi (Kenya), 2006)The spotted stem borer, Chilo partellus is an important insect pest of maize. It damages maize by feeding on the leaves and within the plant. Maize yield loss due to Chilo spp. Stem borer damage is estimated at 44 percent ... -
Química Inorgânica 1
(African Virtual University U i i Vi ll Af i i, 2001-02-07)O módulo começa com um olhar crítico à Tabela Periódica de elementos e a razão para a respectiva forma de classificação. A tabela torna mais fácil a compreensão e mais rápido, dos conceitos e factos da química dos elementos. ...