Abstract Five novel semiconducting organic small molecules have been synthesised, fully characterised, and their photovoltaic performance tested in fabricated organic solar cells. Three (molecules 5, 7 and 9) were acceptor-donor-acceptor (A-D-A) small molecules bearing an electron-rich (3,4- ethylenedioxythiophene) EDOT central core with different terminal groups. The additional two (molecules 20 and 21) were truxene derivatives which have been differentiated by the alkyl chain length on the ...
ABSTRACT The use of poor quality antimalarials causes low bioavailability of the active pharmaceutical ingredients (APIs) to the drug targets resulting in treatment ineffectiveness or failure and parasite resistance over a short period of drug usage. Resistance has rendered the hitherto cheap and effective drugs like chloroquine and sulphadoxine/pyrimethamine ineffective, resulting in their replacement with the more expensive artemisinin-based combination therapy (ACT) for malaria treatment. ...
fflpaODDCTICW Cocoa Xllce many other plants of economic Importance, has a host of its own attendant pests among which lepidopterous caterpillars feature fairly prominently. Early reports on entomological pests in Wsst Africa (lamborn, 191U—1915j Patterson lyllti Peacock, 1913) almost invariably included one or other lepidopterous pest attacking some part of the cocoa tree or seedling. Recent reports* too, abound in information an the problem of Lepidoptera on cocoa e.g. Entwiatle (1960, 1...
ABSTRACT Dye pollutants contaminate water bodies when they are improperly disposed into the ecosystem. Effects caused by the disposal of these dye pollutants include aesthetic pollution, eutrophication and perturbations in aquatic life. This work aims to mitigate these water contamination problems by studying possible degradation of these pollutant compounds. Semiconductor photocatalytic process using nanocrystalline TiO2 as the semiconductor catalyst was adopted in this work to photodegrade ...
ABSTRACT Majority of life-threatening fungal infections in clinics are caused by Candida albicans. The emergence of azole resistance in fungi complicates patient management. In response to chemical stress, C. albicans make transient changes in the gene expression for survival. Notable among these is the upregulation of efflux pump which is known to be the main mechanism of antifungal resistance. Potent therapeutic agents targeting this resistance mechanism are urgently needed. Chemo-sensitiza...
ABSTRACT Aspects of seasonal dynamics, population dynamics, and successional dynamics were investigated in three kinds of woody vegetation which occur on the Accra Plains: dry tropical forest, large thickets, and isolated clumps of thicket. Flowering, fruiting, foliage behaviour, and girth changes show a strong seasonal pattern in the study area; moisture deficits limit phenological activity within the community, although patterns vary among species. Synchrony was high within species in repro...
A parasitological examination of 2,500 faecal samples of cattle was carried out in Plateau State, Nigeria, to determine prevalence, seasonal distribution and sources of various species of Eimeria in both sexes, age groups, breeds and husbandry systems. Effects of temperatures on sporulation of Eimeria oocysts and chemical analysis of the Eimeria oocysts were also determined. Out of 2500 samples examined, 1567 i.e 62.68% were positive for twelve species of Eimeria. E. alabamensis occurre...
Valerohydroxamic and Isovalerohydroxamic acids were synthesised and recrystallised from ethylacetate. They were characterised by melting point, pka and spectral (IR NMR) studies. Their melting points are 77.78°C and 76.77°C for valerohydroxamic acid and isovalerohydroxamic acid respectively and their pka values at 0.1mol dm-3 at 28°C are 9.50+0.01 and 9.51+0.01 for valerohydroxamic acid and isovalerohydroxamic acid respectively. The IR and NMR (1H and 13C) for both valerohydroxamic...
ABSTRACT The bivariate Bernoulli model was used to estimate covariate parameters for conditional as well as marginal models for the NIDs datasets. This is a follow- up research on one conducted by Islam et al. (2012) which introduced the use of the bivariate Bernoulli model to properly specify the dependence among bivariate binary responses. The covariate parameters were estimated by first expressing the proposed model in the exponential family form, finding the log-likelihood function and th...
ABSTRACT Attempts at addressing the increasing water shortage problems in the Greater Accra Metropolitan Area (GAMA) over the years have been biased towards supply management without critically assessing the efficiency of water use from existing schemes of demand management. This study sought to assess the current water demand and supply patterns, and how this affects wastewater reuse options. It investigated whether socio-economic status as well as status of household water supply in differe...
Studies were carried out on the distribution, characterization, pathogenicity and antibiotic susceptibility of Listeria monocytogenes in Six Local Government Areas of Plateau State, Nigeria. A total of One hundred and fifty (150) experimental samples were taken from each test Local Government Area. The isolation was carried out with the aid of cold enrichment, selective broth and selective Listeria agar. The experimental samples examined included: cow, goat, poultry, rabbit and sheep wa...
Abstract The Accra Metropolitan Area (AMA) is a cosmopolitan area with people coming from various economic, social and health backgrounds. Cholera has however been endemic in the area for over three decades. The research aimed at finding the conditions causing the endemic presence of the disease within the Accra Metropolitan Area. The study involved the mapping of cholera risk factors across selected communities of different income levels within the AMA in order to show the level of risk face...
Complexes of Aluminium with some model bioligands, were prepared and characterized by elemental analysis, melting point, conductivity, solubility and infra-red spectroscopic studies. The complexes are soluble in water and some organic solvents such as chloroform, ethanol and methanol. The melting point ranges from 258°C - 282°C for complexes with Al Cl3, and 8Ql C - 95 C, for complexes with AlNH4(S04) 2 .12H2 0. Conductivity studies reveals that the prepared· complexes are non-electr...
This study is concerned with the female enrolment at the junior secondary school levels in Nigeria. In writing this project, the approach has been to determine the trend in female enrolment at the junior secondary school level by the geo - political zones. This research work is organized into five chapters. The first chapter deals with the introduction of the study. In this chapter, the background information is provided, objective of the study is outlined and the significance of the stu...