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Search Results: 1 - 10 of 4324 matches for " Louis Korbla Doamekpor "
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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.
Does Radio Advertisement Influence Sale of Herbal Products in Ghana? Evidence from Ho Municipality  [PDF]
Dadson Awunyo-Vitor, Edward Kwame Ayimey, John Korbla Gadawusu
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.410070
Abstract: Radio as a medium of advertising is very popular among marketers of fast moving consumer goods because it can reach wider audience in both rural and urban areas. In recent times, the popularity of radio as an ideal medium of advertising is gaining ground among herbal medicine producers apparently for commercial gains. This study aimed at analyzing the effect of radio advertising on the sale of herbal products with specific reference to the Ho Municipality. Convenience sampling technique was used to sample the respondents. In all, data had been collected from a sample of 50 respondents comprising ten (10) herbal retail shop operators and forty (40) final consumers of herbal products. Interview guides were used to collect data from the management of herbal retail shops and questionnaires were used to collect data from the consumers of herbal products. Analytical tools used include descriptive statistics and correlation. The study revealed that the majority of consumers got to know of the products through radio advertisement. Also, empirical data analysis suggests that 60.7% of the sales of herbal products could be attributed to advertising. In view of the above findings, further studies may be directed towards identifying other factors that influence the sale of herbal products within the municipality.
Testing the Twin Deficits Hypothesis: Effect of Fiscal Balance on Current Account Balance—A Panel Analysis of Sub-Saharan Africa  [PDF]
Godson Korbla Aloryito, Bernardin Senadza, Edward Nketiah-Amponsah
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.79097
Abstract: The twin deficits hypothesis holds if government’s fiscal deficit, through its impact on national saving and consumption, leads to a deterioration of the current account. The fiscal and current account deficits of most countries in Sub-Saharan Africa (SSA) appear relatively large or have been widening over the past several years in the face of positive output growth and steady decline in inflation. Using data for 41 countries from 2000 to 2012, we test the twin deficits hypothesis for SSA. Applying the system Generalised Method of Moments (GMM) estimation technique, the major conclusion drawn from the results indicates that fiscal deficits tend to improve the current account and vice versa, thereby rejecting the twin deficits hypothesis in favor of the twin divergence proposition. The findings, nonetheless, have policy relevance for the region.
Transient Studies of Ghana Research Reactor-1 after Nineteen (19) Years of Operation Using PARET/ANL Code  [PDF]
Bright Madinka Mweetwa, Emmanuel Ampomah-Amoako, Edward Horga Korbla Akaho
World Journal of Nuclear Science and Technology (WJNST) , 2017, DOI: 10.4236/wjnst.2017.74018
Abstract: The Program for the Analysis of Reactor Transients/Argonne National Laboratory (PARET/ANL) code was used to predict the thermal hydraulic behaviour of the Ghana Research Reactor-1 after adding 9.0 mm of beryllium to the top shim tray of the core. The core was analysed for reactivity insertions 2.1 mk, 3.0 mk, 4.0 mk, 5.0 mk and 6.7 mk, respectively. The reactor is still safe to operate in the range 2.1 mk to 4.0 mk. However, 2.1 mk would be ideal since the reactor automatic shutdown (SCRAM) is set not to exceed 120% of reactor nominal power.
Nutrient Load of the Sakumo Lagoon at the Sakumo Ramsar Site in Tema, Ghana
VK Nartey, KA Edor, LK Doamekpor, LH Bobobee
West African Journal of Applied Ecology , 2011,
Abstract: Water samples were collected from three sections (South, Centre and North) of the Sakumo lagoon for a period of 6 months and analyzed for NO -N, PO -P, NO -N and NH -N, and the results were compared with the 2 4 3 3 Environmental Protection Agency (EPA)-Ghana permissible guideline values for effluents discharged into water bodies and values from similar studies on the lagoon in 1995 and 2003. Observations showed that, of all the nutrients studied, phosphates were the highest in the Sakumo lagoon. The decreasing order of nutrient concentrations in the lagoon were PO -P > NH -N > NO -N > NO -N. The nutrient levels in the lagoon have also 4 3 3 2 shown significant increase over the years.
Justifying Tolerance in Liberal Societies: The Need for Public Morality  [PDF]
Louis Tietje
Open Journal of Philosophy (OJPP) , 2012, DOI: 10.4236/ojpp.2012.21002
Abstract: One of the most important assumptions in liberal societies is that citizens should be tolerant of a diversity of values. We are challenged by this assumption to justify restraint when we confront what we oppose, disapprove of, or perceive to be immoral, even if we have the power to suppress perceived immoralities. Based on the work of Elliot Turiel, Jonathan Haidt, and Gerald Gaus, the argument developed in this article is that the best way to address the challenge is to distinguish between public morality and other normative categories such as convention and private morality. Public morality circumscribes what should not be publicly tolerated. Conventional and private immoralities that are not prohibited by public morality should be tolerated.
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