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Search Results: 1 - 10 of 6253 matches for " Vincent Kodzo Nartey "
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Effects of Quarry Activities on some Selected Communities in the Lower Manya Krobo District of the Eastern Region of Ghana  [PDF]
Vincent Kodzo Nartey, Joseph Nii Nanor, Raphael Kweku Klake
Atmospheric and Climate Sciences (ACS) , 2012, DOI: 10.4236/acs.2012.23032
Abstract: Extraction of Limestone is an economically important and widespread activity in Ghana and has existed since historical times. However, in spite of its remarkable contribution towards economic development, some adverse impacts have been noticed, especially where extraction is carried out without proper planning and use of modern technology and scientific methods. We have carried out an assessment on the environmental effects of limestone quarrying on some communities in the Lower Manya Krobo District in the Eastern region of Ghana. Dust emission is one of the major effects of the practice of limestone extraction and as such, dust (PM10) sampling was conducted at the affected communities. Mean dry season results recorded in these communities stand at 125.0 μg/m3 or Bueryonye, 116.0 μg/m3 at Odugblase and 109.3 μg/m3 at Klo-Begoro. Oterkpolu community which served as the control recorded an average of 50.5 μg/m3. Average rainy season values recorded for the communities were 83.3 μg/m3 for Bueryonye, 113.1 μg/m3 at Odugblase and 74.4 μg/m3 at Klo-Begoro. The control community, Oterkpolu, had 43.3 μg/m3. These values are above the EPA, Ghana daily guideline level of 70 μg/m3 over a time-weighted average per 24 hours. Questionnaires administration and health records obtained from the health facilities in the communities revealed notable deteriorations in the health of the people as a result of the quarrying activities in the area. Notable among these is the prevalence of malaria though not related to dust emissions, it results from mosquitoes breeding in the stagnant pools of water found in pits created as a result of the mining activity. Other common health cases recorded were acute respiratory tract infection, ear and eye infections, cough and pneumonia.
Assessment of the Impact of Solid Waste Dumpsites on Some Surface Water Systems in the Accra Metropolitan Area, Ghana  [PDF]
Vincent Kodzo Nartey, Ebenezer Kofi Hayford, Smile Kwami Ametsi
Journal of Water Resource and Protection (JWARP) , 2012, DOI: 10.4236/jwarp.2012.48070
Abstract: Water samples from four water bodies that flow through some solid waste dump sites in the Accra metropolitan area of Ghana were analysed over a period of six months for Cd, Pb, Cu, Zn and Mn contents; coliform bacteria and helminth eggs. Other water quality parameters such as BOD, DO, suspended solids and turbidity were also assessed. Cd, Pb, Zn, Mn, and Cu were determined using flame atomic absorption spectrometry (FAAS). Faecal coliforms, total coliforms and helminth eggs were determined by the membrane filtration (MF) method. The water samples contain various levels of Cd, Pb and Mn; Zn and Cu levels were low and found to be below the detection levels of the instrument in most cases. Helminth egg counts in water samples were high; an indication that the water bodies were polluted with pathogens. It has been observed that the major sources of pollutants into the water bodies were organic waste as well as coliform bacteria derived from these waste dumps. The elevated levels of bacteria make the water bodies unsafe for both primary and secondary contacts.
Synthesis and Conformational Studies of Some Metacyclophane Compounds  [PDF]
Louis Korbla Doamekpor, Vincent Kodzo Nartey, Raphael Kwaku Klake, Takehiko Yamato
International Journal of Organic Chemistry (IJOC) , 2012, DOI: 10.4236/ijoc.2012.22023
Abstract: Various [3.3.3]metacyclophane derivatives were synthesized from 6,15,24-tri-tert-butyl-9,18,27-trimethoxy [3.3.3] metacyclophane-2,11,20-trione 1 using simple chemical reactions. The conformations of the synthesized compounds were studied using mainly solution Proton Nuclear Magnetic Resonance (1H NMR) spectroscopic methods. Two of the synthesized compounds 5, 6, were found to have a partial cone conformation with the third, 4, having the cone conformation. Detailed variable temperature Proton Nuclear Magnetic Resonance studies further confirmed the partialcone conformation for the two products, 5, 6. During the variable temperature nuclear magnetic resonance spectroscopic studies, 6,15,24-tri-tert-butyl-9,18,27-trimethoxy[3.3.3]metacyclophane-2,11,20-triol was found to have a coalescence temperature of about 0?C.
Correlation between Heavy Metals in Fish and Sediment in Sakumo and Kpeshie Lagoons, Ghana  [PDF]
Raphael Kwaku Klake, Vincent Kodzo Nartey, Louis Korbla Doamekpor, Kenneth A. Edor
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.39125
Abstract: Concentrations of heavy metals (Cd, Pb, Mn, Zn, and Cu) were measured in bottom sediment and the black-chin tilapia (Sarotherodon melanotheron) from the Sakumo and Kpeshie lagoons using Atomic Absorption Spectrometry (AAS). Results for the levels of these metals in the sediments and fish were compared with WHO guideline values. It was observed that heavy metal concentrations in sediments of Sakumo lagoon were higher than those of Kpeshie lagoon. Among the metals, Cu and Zn were found to be highly concentrated in the fish but lower than the World Health Organization (WHO) recommended values. Spearman correlation coefficient study showed significant correlation coefficients between Pb and Zn (0.937) and between Cu and Mn (0.613) at 0.05 levels.
Synthesis and Conformational Studies on [3.3.3]Metacyclophane Oligoketone Derivatives, and Their Metal Ion Recognition  [PDF]
Louis Korbla Doamekpor, Raphael Kwaku Klake, Vincent Kodzo Nartey, Takehiko Yamato, Oti Gyamfi, Dennis Adotey
International Journal of Organic Chemistry (IJOC) , 2015, DOI: 10.4236/ijoc.2015.52014
Abstract: Chemical reactions were used to synthesize 2,11,20-tris(ethanedithia)-9,18,27-trimethoxy-6,15, 24-tri-tert-butyl[3.3.3]metacyclophane 2 and 2,11-bis(ethanedithia)-9,18,27-trimethoxy-6,15,24-tri-tert-butyl[3.3.3]metacyclophane 4 from 6,15,24-tri-tert-butyl-9,18,27-trimethoxy[3.3.3]meta-cyclophane-2,11,20-trione 1 and -2,11-dione 3. The yields of 2 and 4 were 70% and 81% respectively. The conformations of the synthesized compounds 2 and 4 were studied using mainly solution Proton Nuclear Magnetic Resonance (1H NMR) spectroscopic methods. Compounds 2 and 4 were found to have a partial-cone conformation. Detailed variable temperature Proton Nuclear Magnetic Resonance studies further confirmed the partial-cone conformation for the two products, 2, 4. During the variable temperature nuclear magnetic resonance spectroscopic studies, compound 2 was found to have a coalescence temperature of about 0?C. Extraction of silver ions with compound 2 gave an extractability of 82% while the parent compound 1 showed zero (0) silver affinity. A 1:1 mol/mol mixture of compound 2 and silver ions studied by solution 1H NMR revealed a novel “Molecular Roulette” type of motion.
Assessment of the Contribution of Road Runoffs to Surface Water Pollution in the New Juaben Municipality, Ghana  [PDF]
Louis Korbla Doamekpor, Richmond Darko, Raphael Kwaku Klake, Victus Bobonkey Samlafo, Lord Hunuor Bobobee, Cornelius Kwame Akpabli, Vincent Kodzo Nartey
Journal of Geoscience and Environment Protection (GEP) , 2016, DOI: 10.4236/gep.2016.41018
Abstract: Road runoffs were sampled from five highways and five urban roads located in the New Juaben Municipality during the late storm events in the month of November 2014 and the early storm events in January 2015. A variety of water quality parameters such as, pH, temperature, turbidity, electrical conductivity (EC), total suspended solids (TSS), total dissolved solids (TDS), aqueous concentrations of Chloride (Cl-), Phosphate (\"\"), Nitrate (\"\") and Sulphate (\"\") ions as well as the total concentrations of some selected heavy metals (Fe, Cu, Zn, Pb, Cd, Ni and Cr) were analysed for both periods. Although the results for the studied parameters, particularly the heavy metals varied for both sampling periods, the general trend indicated an increase in accumulation from November 2014 to January 2015. This was attributed to vehicular deposition as well as other natural and anthropogenic depositions on the road surfaces during the antecedent dry weather period between the two sampling months. The highest increase in pollutant loadings was associated with the heavy metals and some physico-chemical parameters such as TSS, TDS, EC and turbidity. Generally, EC, TDS, TSS and turbidity were above the permissible limits of the Environmental Protection Agency (EPA) of Ghana for both sampling periods. However, almost all the mean concentrations of heavy metals recorded for both road runoffs and the control samples were within the permissible limits of the Ghana EPA with some few exceptions.
Assessment of Mercury Pollution in Rivers and Streams around Artisanal Gold Mining Areas of the Birim North District of Ghana  [PDF]
Vincent K. Nartey, Raphael K. Klake, Ebenezer K. Hayford, Louis K. Doamekpor, Richard K. Appoh
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.29141
Abstract: Artisanal gold mining in local communities is on the increase. This has led to concerns about mercury pollution resulting from these mining activities. This study was conducted to assess the level of mercury pollution in rivers and streams around artisanal gold mining areas of the Birim North District of Ghana. Rivers, streams, sediments and boreholes were sampled to determine total mercury levels during the wet and dry seasons and to explore the potential impact of the mercury levels on water quality in the area. The results show that the total mercury concentrations measured upstream were significantly lower than concentrations in samples taken downstream. Also, the total mercury concentrations measured in the stream water samples in both seasons exceeded the WHO guideline limit (1.0 µg/L) for drinking water. However, one downstream total mercury concentration exceeded the guideline limit in the dry season. The total mercury concentrations in sediments upstream and downstream in both seasons exceeded the US-EPA guideline value of 0.2 mg/kg. The boreholes in the study area have total mercury concentrations exceeding the WHO guideline limit during both seasons. Total mercury concentrations in the boreholes in the wet season were lower than the dry season.
Nested Variant of Urothelial Carcinoma
Anthony Kodzo-Grey Venyo
Advances in Urology , 2014, DOI: 10.1155/2014/192720
Abstract: Background. Nested variant of urothelial carcinoma was added to the WHO’s classification in 2004. Aims. To review the literature on nested variant of urothelial carcinoma. Results. About 200 cases of the tumour have been reported so far and it has the ensuing morphological features: large numbers of small confluent irregular nests of bland-appearing, closely packed, haphazardly arranged, and poorly defined urothelial cells infiltrating the lamina propria and the muscularis propria. The tumour has a bland histomorphologic appearance, has an aggressive biological behaviour, and has at times been misdiagnosed as a benign lesion which had led to a significant delay in the establishment of the correct diagnosis and contributing to the advanced stage of the disease. Immunohistochemically, the tumour shares some characteristic features with high-risk conventional urothelial carcinomas such as high proliferation index and loss of p27 expression. However, p53, bcl-2, or EGF-r immunoreactivity is not frequently seen. The tumour must be differentiated from a number of proliferative lesions of the urothelium. Conclusions. Correct and early diagnosis of this tumour is essential to provide early curative treatment to avoid diagnosis at an advanced stage. A multicentre trial is required to identify treatment options that would improve the outcome of this tumour. 1. Introduction Carcinoma of the urinary bladder is the most common malignancy involving the urinary tract system. Urothelial carcinomas can also occur in the renal pelvis, ureter, or urethra but their occurrence is far less common than in the urinary bladder. The histology of urothelial carcinoma is variable. On the whole about 70% of urothelial carcinomas of the urinary bladder are noninvasive or superficially invasive and these tumours are usually papillary and exhibit different degrees of differentiation; on the other hand, most muscle-invasive urothelial carcinomas are nonpapillary and usually exhibit high-grade cytomorphology. These types of classic urothelial carcinomas can be easily diagnosed histologically and they do not pose a problem to the pathologist. A number of systems have been utilized to grade and classify urinary bladder tumours. In 1972, the World Health Organization (WHO) adopted a system which distinguished papillomas from grades I, II, and III papillary transitional cell carcinomas. Subsequently in 1998, The World Health Organization in a collaborative effort conjointly with the International Society of Urological Pathologists (ISUP) published a consensus opinion classification system
Lymphoma of the Urinary Bladder
Anthony Kodzo-Grey Venyo
Advances in Urology , 2014, DOI: 10.1155/2014/327917
Abstract: Background. Lymphoma of the urinary bladder (LUB) is rare. Aims. To review the literature on LUB. Methods. Various internet databases were used. Results. LUB can be either primary or secondary. The tumour has female predominance; most cases occur in middle-age women. Secondary LUB occurs in 10% to 25% of leukemias/lymphomas and in advanced-stage systemic lymphoma. Less than 100 cases have been reported. MALT typically affects adults older than 60 years; 75% are female. Diffuse large B-cell lymphoma is also common and may arise from transformation of MALT. LUB presents with haematuria, dysuria, urinary frequency, nocturia, and abdominal or back pain. Macroscopic examination of LUBs show large discrete tumours centred in the dome or lateral walls of the bladder. Positive staining of LUB varies by the subtype of lymphoma; B-cell lymphomas are CD20 positive. MALT lymphoma is positively stained for CD20, CD19, and FMC7 and negatively stained for CD5, CD10, and CD11c. LUB stains negatively with Pan-keratin, vimentin, CK20, and CK7. MALT lymphoma exhibits t(11; 18)(q21: 21). Radiotherapy is an effective treatment for the MALT type of LUB with no recurrence. Conclusions. LUB is diagnosed by its characteristic morphology and immunohistochemical characteristics. Radiotherapy is a useful treatment. 1. Introduction Lymphoma of the urinary bladder is an uncommon lesion; and its diagnostic features may not be well known by the unaccustomed practitioner. The ensuing document contains a review of the literature on lymphoma of the urinary bladder. 2. Methods The key words used for the search were Lymphoma of bladder; lymphoma of urinary bladder; vesical lymphoma. Documentations from 46 sources were found which had discussed various aspects relevant to lymphoma of the urinary bladder and information from these 46 sources were used to write the literature review. 3. Literature Review 3.1. Overview Definition. Lymphoma of the urinary bladder can be either (a) primary lymphoma of the urinary bladder and this is a rare lymphoma originating in the urinary bladder with no known lymphoma elsewhere or (b) secondary lymphoma of the urinary bladder and this is much more common, and this secondary lymphoma is associated with a primary lymphoma originating in an extra vesical site [1]. Epidemiology. Lymphomas of the urinary bladder have a female predominance, and most cases of lymphoma of the urinary bladder occur in middle-age women [1]. Secondary involvement of the urinary bladder occurs in 10% to 25% of leukemias/lymphomas and they occur in advanced-stage systemic lymphoma [1].
Microcystic Variant of Urothelial Carcinoma
Anthony Kodzo-Grey Venyo
Advances in Urology , 2013, DOI: 10.1155/2013/654751
Abstract: Background. Microcystic variant of urothelial carcinoma is one of the new variants of urothelial carcinoma that was added to the WHO classification in 2004. Aims. To review the literature on microcystic variant of urothelial carcinoma. Methods. Various internet search engines were used to identify reported cases of the tumour. Results. Microscopic features of the tumour include: (i) Conspicuous intracellular and intercellular lumina/microcysts encompassed by malignant urothelial or squamous cells. (ii) The lumina are usually empty; may contain granular eosinophilic debris, mucin, or necrotic cells. (iii) The cysts may be variable in size; round, or oval, up to 2?mm; lined by urothelium which are either flattened cells or low columnar cells however, they do not contain colonic epithelium or goblet cells; are infiltrative; invade the muscularis propria; mimic cystitis cystica and cystitis glandularis; occasionally exhibit neuroendocrine differentiation. (iv) Elongated and irregular branching spaces are usually seen. About 17 cases of the tumour have been reported with only 2 patients who have survived. The tumour tends to be of high-grade and high-stage. There is no consensus opinion on the best option of treatment of the tumour. Conclusions. It would prove difficult at the moment to be dogmatic regarding its prognosis but it is a highly aggressive tumour. New cases of the tumour should be reported in order to document its biological behaviour. 1. Introduction Since microcystic variant of urothelial carcinoma was added to the WHO classification, very few cases have been reported in the literature, and in view of this most practitioners would be unfamiliar with the biological behaviour of this rare type of tumour. The ensuing paper contains literature review of microcystic variant of urothelial carcinoma. 2. Methods Various internet search engines including Google, Google Scholar, PubMed, Educus. and UpToDate were used to identify the literature including case reports, case series, and review papers on microcystic variant of urothelial carcinoma for the review of the literature on microcystic variant of urothelial carcinoma. The key words that were used included microcystic variant of urothelial carcinoma and microcystic transitional cell carcinoma. In all 17 documentations were found which were relevant to the aetiology, presentation, diagnosis, management, and outcome of microcystic variant of urothelial carcinoma. 3. Literature Review 3.1. Overview 3.1.1. Definition and Terminology Microcystic variant of urothelial carcinoma is one of the variants of
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