Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Search Results: 1 - 10 of 190 matches for " TESFAYE Abraha "
All listed articles are free for downloading (OA Articles)
Page 1 /190
Display every page Item
Finding the Radiation Amplitude Zero in W\GAMMA Production- is it Unique to the Standard Model?
Mark A Samuel,TESFAYE Abraha
Physics , 1997,
Abstract: In the light of recent experimental observation of the radiation amplitude zero (RAZ) in W\gamma production by CDF at Fermilab, we consider its consequences. is the RAZ unique to the standard model? Although it is not for neutrino-electron scattering, in the case of d-ubar scattering which is the case of experimental interest, observation of the RAZ implies that the SM must be correct.
The role of seed priming in improving seedling growth of maize (Zea mays L.) under salt stress at field conditions  [PDF]
Berhanu Abraha, Gebremedhn Yohannes
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.412089
Abstract: Salinity is considered as a major abiotic stress affecting germination, seedling growth and crop production in arid and semi-arid regions. Many techniques are used to improve tolerance to salinity. Priming is believed to be an effective solution that increases germination, plant growth and improve yield of several vegetables and crops under saline soil condition. The objective of this study was to see the effect of seed priming with 5 g/L NaCl on maize seedling growth exposed to five salinity levels under field conditions. Maize seeds were soaked in 5 g/L NaCl solution for 12 h at room temperature. Primed and unprimed seeds were sown in pots and were irrigated with saline solutions of five concentrations (0, 2, 4, 6 and 8 g/l NaCl). Each pot was irrigated with 200 ml saline solution of the desired treatment in two days interval. Priming seeds with NaCl significantly (P < 0.05) improved growth of maize plants. As a result, fresh and dry weights of shoots and roots were improved. Seed priming alleviated the inhibitory effect of salt stress on seedling growth of maize under salt stress. Thus, seed priming with 5 g/l NaCl could be used to improve early growth of Zea mays. Further, this study needs to be continued if performance of mature maize plants could also be improved and yield could be increased by sowing primed seeds in saline soils.
Child Rights Protection in Ethiopia: Critical Analysis of the Statutory Rape Provisions of the Criminal Code and Their Application  [PDF]
Amare Tesfaye
Beijing Law Review (BLR) , 2017, DOI: 10.4236/blr.2017.84028
Abstract: Children, due to their mental and physical immaturity, are among the vulnerable section of the society. States are thus required to provide special protection and care for children by making necessary legal and institutional arrangements. To this effect, Ethiopia has ratified international and regional human rights instruments meant to provide protection for children. It also included provisions protecting child rights in its constitution. These constitutional provisions have also found expression in the subsequent legislative reform that, among others, resulted in the adoption of a New Criminal Code in 2004. This Criminal Code replaces the provisions of the earlier 1957 Penal Code on statutory rape providing better protection for children against sexual abuse. Yet, gaps still persist both in the law and practice in terms of fully realizing the rights of children in Ethiopia. This article aims to examine the legal and practical protection of children by the statutory rape provisions of the Criminal Code in the Ethiopian legal system. In doing so, it attempts to evaluate the current statutory rape provisions of the Criminal Code against child rights standards as well as evaluating the practical application of the laws by courts and prosecutors.
Biotechnology: Science versus Value—Laden Decisions  [PDF]
Berhanu Abraha Tsegay, Alemayehu Bishaw Tamiru
Open Journal of Philosophy (OJPP) , 2014, DOI: 10.4236/ojpp.2014.42021

This paper explains the philosophical justifications of values on decisions in biotechnology, and compares the ethical values of animals and plants in our day-to-day activity in general and in modifying their genes in particular. We have posed some questions on the current ethical views with regard to the morality on manipulating plants. Since plants, like all other organisms, are destined to be used by humans and so far, we uphold the stability and integrity of the living system, and it is ethical to genetically manipulate plants and use them for our interests. However, we should have the moral obligation to regard their inherent value as we do for animals.

In Vitro Screening of Cactus [Opuntia ficus-indicia (L.) Mill] Genotypes for Drought Tolerance  [PDF]
Berhan Mengesha, Firew Mekbib, Eyasu Abraha
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.713163
Abstract: Drought is one of the complex environmental factors affecting growth and yield of crops in arid and semi-arid areas of the world. In this context, this investigation was carried out to select drought tolerance cactus genotypes under in vitro condition. An experiment was carried out at Laboratory of Mekelle Agricultural Research Center, Northern Ethiopia. Six cactus pear genotypes namely, Gerao, Keyih Beles, Shenkor, Limo, Lemats Beles and Suluhna were used. Areoles were used as explants in tissue culture. The non-ionic water soluble polymer polyethylene glycol (PEG) of molecular weight 6000 was used as osmoticum to simulate water stress. In the first culture, the MS medium was supplemented with (2, 4-D (4 mg/l) and BA (0.5 mg/l) for callus induction. In all cultures MS medium was supplemented with 0, 10, 20 and 40 g/l polyethylene glycol (PEG) and was solidified with 0.8% agar and 30 g of sucrose. Significant differences were observed among the genotypes, PEG levels. In the first culture highest number of explants initiated callus on medium supplemented with no PEG but had not shown significant difference with 10 g/l PEG. At 10 g/l PEG, the callus induction frequency, callus fresh weight and plantlet regeneration were recorded highest for Suluhna (83.3%, 5.5 g and 63.3%), respectively. At 40 g/l PEG, callus induction frequency, callus fresh weight and plantlet regeneration were produced highest for Suluhna (41.7%, 2.75 g and 45%), respectively but no significant difference with Gerao, Limo and
Temporal and Spatial Factors Affecting the Nature of Genotype x Environment Interaction in Sugarcane (Saccharum officinarum L.) under Ethiopian Agro-Climatic Conditions: An Integrated Approach  [PDF]
Mebrahtom Ftwi, Firew Mekbib, Eyasu Abraha
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.87119
Abstract: Analytical approaches are important for identification the causes of Genotype x environment interaction (GEI) in multi-environment trials (MET). The objectives of this investigation were to explore the nature and causes of the GEI in sugarcane under Ethiopian agro ecological conditions. Data of Cane yield, recoverable sucrose% and sugar yield obtained from 13 test environments were subjected to Additive Main and Multiplicative Interaction (AMMI2) for empirical study. For environmental characterization, mean values of twenty seven temporal and spatial factors were subjected to Principal Component Analysis (PCA). Moreover, to identify the environmental factors affecting the patterns of GEI and its components, mean values of these factors were correlated with environment AMMI2 IPCA scores of the yield traits studied. Results of the present study indicated that the GEI accounted for larger variation than the genotypic effects which suggested its importance and complexity. The PCA bi-plot successfully identified the environmental factors that most discriminated the test environments (crop years and locations). The correlation analysis between the environmental factors and environmental AMMI2 IPCA scores adequately identified the environmental factors affecting GEI and its components. Soil organic matter% and soil clay%, pan evaporation at establishment, relative humidity at growth stage and harvesting month were the major factors that substantially affect the GEI interaction patterns in cane yield while maximum relative humidity recorded during the growing season, all temperature regimes recorded during the entire growing season and at different crop stages were the major factors that affect GEI in recoverable sucrose%. Moreover, the pattern of GEI in sugar yield was significantly affected by harvest age, percent of clay in soil, altitude, relative humidity at harvest and pan evaporation at establishment. For efficient environmental selection and networks, genotype evaluations and formulation of appropriate sugarcane breeding strategy, f METs should adopt the inclusion of these environmental factors identified as major factors influencing the patterns of GEI. Moreover, more information will be generated if other physiological and soil moisture stress indices are included in future GEI studies in sugarcane.
The Protection of Linguistic Minorities: An Appraisal on the Role of Multination Federalism  [PDF]
Amare Tesfaye, Zelalem Kebu
Beijing Law Review (BLR) , 2016, DOI: 10.4236/blr.2016.74028
Abstract: This article mainly focuses on the role of multination federalism in protecting linguistic minorities from assimilation or crumbling to/from the majority in a multination federacy like Ethiopia. In doing so, it has attempted to reflect the concerns raised by some other scholars in relation to territorial integrity of the state in a multination federal state structure and a conclusion as to the inappropriateness of such concern has been reached exhaustively. Resultantly, this article argues that multination federalism is highly potent to maintain integrity of the state, resolving the void by filling it against the possible tensions that may exist between the linguistic minorities and majorities. It has subtle fortitude for the protection of linguistic minorities among others through exactitude of the schemes like conferring them distinctive autonomy within a multination state, igniting them to employ their language without any encroachment and epithet, ensuring them to deserve their distinct identity and paving the way to ensure their participation in different fields meant for the public concerns. It also attracts the linguistic minorities’ right to education in their own mother tongue.
Plant gene technology: social considerations
Berhanu Abraha Tsegay
African Journal of Biotechnology , 2004,
Abstract: The genetic modification of plants by gene technology is of immense potential benefits, but there may be possible risks. The advantages and social concerns of plant gene technology are discussed. Key Words: Gene technology, genetically modified plant, agriculture. African Journal of Biotechnology Vol.3(3) 2004: 156-158
Analysis of Watershed Attributes for Water Resources Management Using GIS: The Case of Chelekot Micro-Watershed, Tigray, Ethiopia  [PDF]
Tesfaye Gebre, Tigist Kibru, Samuale Tesfaye, Gebeyehu Taye
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.72015
Abstract: This study identified the importance of watershed attributes for water resource management using ArcGIS software, ASTER DEM and satellite images for the Chelekot micro-watershed, Tigray, Ethiopia. The study also evaluate the different hydrological parameters which are significant for the water resource management within the micro-watershed and finds the alternative solutions for water harvesting in the study area through the introduction of suitable soil and water conservation structures based on the finding. Principal watershed attributes including drainage pattern, topographic parameters, land use types, and soil types were evaluated and interpreted for the study micro-watershed. ArcGIS software was used for the computation, delineation of the boundary and morphometric analysis of the micro-watershed using topographical maps and ASTER DEM data. Results indicate that the micro-watershed has classified as a dendritic pattern with stream orders ranging from first to fifth order. The micro-watershed has homogeneity in texture and lack of structural control of surface flow. The drainage density is medium which indicates the area contains soils with medium infiltration rates and moderate relief. Drainage texture, stream frequency and the form factor of the micro-watershed are 4.1, 1.7 and 0.4 respectively. The bifurcation ratio of the micro-watershed ranges from 1 to 4.5 and the elongation ratio is 0.7 which reveals that the micro-watershed belongs to the less elongated shaped micro-watershed category. The mean bifurcation ratio of the whole micro-watershed is 3.3 indicating that the drainage pattern is not greatly influenced by geological structures. The micro-watershed land covers includes: cultivated land (75.8%), settlement and open land (10.5%), shrubs and plantation (13.2%), and water body (0.4%). The major soil types are Vertisol (58%), Camisole (32%), Regosol (9.5%) and Luvisol (0.7%). The textural classes are clay (5%), silty clay (22%), clay loam (17%), sandy loam (21%) and loam (35%) based on the soil textural map of the micro-watershed. Our results revealed that using GIS and ASTER DEM data based watershed morphometric analysis and hydrological evaluation at watershed scale is more applied and precise compared to other available techniques.
Optical Properties of Silver Nanoparticles for Surface Plasmon Resonance (SPR)-Based Biosensor Applications  [PDF]
Lufsyi Mahmudin, Edi Suharyadi, Agung Bambang Setio Utomo, Kamsul Abraha
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.68111
Abstract: It has been successfully carried out the synthesis of silver nanoparticles by chemical reduction method. Silver nitrate (AgNO3) is used as the metal precursor and trisodium citrate as the reducing agent as well as the use of polyvinyl alcohol (PVA) as a stabilizer. The formation of silver nanoparticles was observed visually with discoloration (yellow). To excite surface plasmons, attenuated total reflection (ATR) method is used with Krestchmann configuration of the prism coupling. The maximum absorption band in the UV-Vis spectrometer shows a red shift of 429.43 nm wavelength for a colloidal solution of silver nanoparticles without PVA and 429.01 nm with PVA. The addition of PVA sharpened absorption spectrum curve and produce a broad absorption band which is indicative of a smaller particle size. TEM images showed that the morphology (crystallites) silver nanoparticles have nearly spherical geometry with dispersive particle distribution. Dispersibility of nanoparticles such as this could potentially be used as an active ingredient of SPR biosensor. The observation of the SPR phenomenon shows the SPR angle shift of 0.1° when a thin layer of silver as an active ingredient a biosensor coated with silver nanoparticles and 0.2° when silver nanoparticles with PVA. SPR angle shift and increase the reflectance values caused by changes in surface Plasmon, which can be a reference that the SPR phenomenon with the sensing surface modification using an additional layer of silver nanoparticles can increase sensitivity.
Page 1 /190
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.