A B S T R A C T The b io lo g y o f th r e e s p e c ie s o f Oxycarenus found in Southern Ghana has been s tu d ied . T h e i r h o s t p la n t s are l i s t e d and host p r e fe r en c e s examined. The sea sonal p opula t io n changes o f two s p e c ie s have been fo l low e d . The n a tu ra l enemies and d e fen s iv e mechanisms have been s tu d ie d . A d e t a i l e d d e s c r ip t io n o f the immature s ta g e s o f the th r e e Oxycarenus sp e c ie s has been g iv en f o r th e...
Abstract In this work, we review 3-dimensional gravity by canonically analyzing the Hilbert- Palatini action. We apply a time gauge used in 4-dimensional loop quantum gravity [14] to the simpler case of the 3-dimensional loop quantum gravity. By time gauge xing this Hilbert-Palatini action it leads to the Gauss constraints, the spatial dieomorphism constraints, the Hamiltonian constraint and a new constraint C. The gauge symmetries generated by this new constraints are spacetime dieomorphism ...
ABSTRACT Background: Schistosomiasis is a neglected tropical disease caused by the genus Schistosoma. It has a worldwide distribution with more cases occurring in Africa. Urogenital schistosomiasis caused by Schistosoma haematobium is prevalent in several places within Ghana, particularly in areas where there are large water bodies. Persistent infection of S. haematobium leads to cytological changes of urothelial cells which in turn could lead to the development of bladder cancer. The persist...
ABSTRACT Maize production in Ghana between 1984 and 1990 exceeded 500,000 metric tonnes per year except in 1985 where there was a shortfall to 395,000 metric tonnes. The unfavourable years of drought between 1981-1983 were attended by a sharp decline in maize production ( 140,000-333,200 metric tonnes ). The bulk of the national maize production was contributed by Ashanti, Brong-Ahafo, Eastern and Northern Regions. Maize husk available after removing cobs was commensurate with the total maize...
ABSTRACT Tuberculosis (TB) remains one of the major life threatening infectious diseases of public health concern globally. Its treatment is long and complex, requiring a cocktail of four drugs administered for six months. Pyrazinamide (PZA) is a cornerstone drug in the treatment regimen for tuberculosis that has contributed to reducing the treatment time from nine to six months. PZA is a pro-drug that is converted to its active form, pyrazinoic acid (POA) by the bacterial enzyme nicotinamida...
ABSTRACT The study sought to identify changes that home-based enterprises have undergone in Ga Mashie, an urban community in Accra. The research further explored the gender dimensions as well as the benefits and challenges of home-based enterprises in the study area. In all 200 questionnaires, 24 in-depth interviews, 3 focus group discussions and personal observations were used to collect the data for analysis. The study revealed that there have been significant changes in home-based enterp...
ABSTRACT Most macroeconomic variables such as; inflation, GDP and others have been described by most financial and economic time series analysts to exhibit nonlinear behaviour. Therefore, to cater for this behaviour, the nonlinear class of models have been largely adopted to model and forecast such time series. In this study, the Keenan and Tsay tests for linearity showed inflation and CIC rates follow threshold nonlinear processes. Hence, the two-regime SETAR model was adopted to accommodat...
ABSTRACT The study was in two parts. The first part dealt with the determination o f water quality parameters such as pH, temperature, DO, BOD, COD, conductivity, turbidity, suspended solids, dissolved solids and total solids. Others are nutrients and ions such as nitrates, nitrites, phosphates, chlorides, calcium, magnesium, sodium and potassium. The rest were under hardness o f water such as calcium, magnesium and total hardness. Of all these parameters, only the values for turbidity i.e 80...
ABSTRACT Acute gastroenteritis (AGE) is an inflammation of the intestinal mucosa and is characterised by the onset of diarrhoea with or without vomiting, fever, and abdominal pain. Rotaviruses are the leading cause of AGE in infants and young children resulting in severe dehydration, which can eventually lead to hospitalisation and death. In Ghana, diarrhoea is implicated in the death of about 11% of all children under the age of 5 years, with rotavirus being the most responsible causative a...
ABSTRACT During external beam radiotherapy treatments, high doses are delivered to the cancerous cell. Accuracy and precision of dose delivery are primary requirements for effective and efficient treatment. This leads to the consideration of treatment parameters such as percentage depth dose (PDD), tissue air ratio (TAR) and tissue phantom ratio (TPR), which show the dose distribution in the patient. Nevertheless, tissue air ratio (TAR) for treatment time calculation, calls for the need to m...
ABSTRACT Coconut seeds was investigated for its use as biodiesel feedstock. Oil was extracted from coconut seeds using soxhlet extraction method where 67.2% yield of oil was obtained. Biodiesel synthesis was developed and optimized using Box-Behnken design in Response Surface Methodology to study the effect of experimental variables such as methanol to oil ratio, catalyst concentration, reaction temperature and reaction time on the extracted oil from coconut seeds. The model shows optim...
ABSTRACT The study was in two parts. The first part dealt with the determination o f water quality parameters such as pH, temperature, DO, BOD, COD, conductivity, turbidity, suspended solids, dissolved solids and total solids. Others are nutrients and ions such as nitrates, nitrites, phosphates, chlorides, calcium, magnesium, sodium and potassium. The rest were under hardness o f water such as calcium, magnesium and total hardness. O f all these parameters, only the values for turbidity i.e 8...
ABSTRACT African trypanosomiasis still remains a lethal disease to both human and livestock. The disease persists due to limited drug availability, toxicity and emergence of drug resistance, hence the need to provide alternative forms of therapy. Studies have shown that the iron chelator deferoxamine exhibited anti-trypanosomal effects by inhibiting cell growth and interfering with the activity of some iron dependent enzymes. In this study, the in vitro effects of different phenolic acids, w...
ABSTRACT Population growth and industrialisation have put a lot of pressure on water resources the world over. Accra is overpopulated due to influx of people from other part of the country to seek greener pastures with limited access to water supply from the Ghana Water Company Limited (GWCL) resulting in individuals supplying their own water through drilling of individual boreholes. Hydrochemical data from 39 water samples (i.e. boreholes, hand dug wells and surface water) from six communiti...
ABSTRACT In this work, necessary and sufficient conditions are investigated and proved for the controllability of nonlinear functional neutral differential equations. The existence, form, and uniqueness of the optimal control of the linear systems are also derived. Global uniform asymptotic stability for nonlinear infinite neutral differential systems are investigated and proved and ultimately, the Shaefers’ fixed point theorem is used to forge a new and farreaching result for the exi...