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Search Results: 1 - 10 of 149701 matches for " H Yohannes "
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Active Sulforhodamine 101 Uptake into Hippocampal Astrocytes
Christian Schnell, Yohannes Hagos, Swen Hülsmann
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0049398
Abstract: Sulforhodamine 101 (SR101) is widely used as a marker of astrocytes. In this study we investigated labeling of astrocytes by SR101 in acute slices from the ventrolateral medulla and the hippocampus of transgenic mice expressing EGFP under the control of the astrocyte-specific human GFAP promoter. While SR101 efficiently and specifically labeled EGFP-expressing astrocytes in hippocampus, we found that the same staining procedure failed to label astrocytes efficiently in the ventrolateral medulla. Although carbenoxolone is able to decrease the SR101-labeling of astrocytes in the hippocampus, it is unlikely that SR101 is taken up via gap-junction hemichannels because mefloquine, a blocker for pannexin and connexin hemichannels, was unable to prevent SR101-labeling of hippocampal astrocytes. However, SR101-labeling of the hippocampal astrocytes was significantly reduced by substrates of organic anion transport polypeptides, including estron-3-sulfate and dehydroepiandrosterone sulfate, suggesting that SR101 is actively transported into hippocampal astrocytes.
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.
Cyber Warfare: A New Hullaballoo under International Humanitarian Law  [PDF]
Yohannes Eneyew Ayalew
Beijing Law Review (BLR) , 2015, DOI: 10.4236/blr.2015.64021
Abstract: Cyber warfare is a new phenomenon and scenario under International Humanitarian law. This paper was basically portrayed the impact of cyber warfare in light with international humanitarian law and assessed the notion of cyber warfare, conduct of hostilities, legal framework, monitoring mechanisms as well as current challenges. Moreover, critical legal analysis is used as principal methodology. Major findings of the research revealed that there are plethora of issues to be underlined save as absence of binding treaty governing the challenging scenarios. Recommendations are made by suggesting points of improvement until the international community has agreed on this cross-cutting contemporary issue.
Seroprevalence of bovine brucellosis in agro pastoral areas of Jijjiga zone of Somali National Regional State, Eastern Ethiopia
H Degefu, M Mohamud, M Hailemelekot, M Yohannes
Ethiopian Veterinary Journal , 2011,
Abstract: A cross-sectional study was carried out from October 2008- March 2009 to determine the sero-prevalence of bovine brucellosis in four districts of Jijjiga Zone, eastern Ethiopia. Purposive sampling technique was employed to select the four districts and nine peasant associations (PAs). A total of 435 blood samples were collected from cattle of 6 or more months of age with no history of previous vaccination against brucellosis. All serum samples were initially screened by Rose-Bengal- Plate Test (RBPT) and those positive reactors to RBPT (n=8) were further tested by complement fixation test (CFT) for confirmation. Out of the 8 RBPT positive sera 6 were found to be positive to CFT. Accordingly, the overall seroprevalence of bovine brucellosis in Jijjiga Zone was 1.38% (6/435). The seroprevalence of bovine brucellosis in the four districts namely Awbare, Harshi, Kebribayah and Fafan districtes were 0.78%, 2.91%, 2.06% and 0%, respectively. Statistically there is no significant deference among the four districts (÷2 = 3.37, df = 3, P = 0.268). The study also revealed absence of significant statistical variation in the seroprevalence of brucellosis in different age and sex groups of the study animals (P > 0.05). Result of this study showed that the seroprevalence of bovine brucellosis in the study area is low. However, it is highly likely that the disease spreads in unaffected animals and herds given the extensive production system prevailing in the area which may allow contact of animals during grazing and at watering points. The public in general and high risk group in particular should be made aware of the zoonotic importance of bovine brucellosis.
Age Determination at Tikur Anbessa Specialized Hospital, Addis Ababa University.
S Hailu, R Fikre, H Yohannes, A Daniel, LW Biruk
East and Central African Journal of Surgery , 2011,
Abstract: Background: African doctors, besides their enormous work load, are frequently involved in indirect clinical practices like age determination, disability evaluation and writing various kinds of certificates. This is a retrospective study aimed at assessing profile of subjects presenting for age determination. It determines different characteristics of subjects and the process of age determination. Age determination board/clinic of “Tikur-Anbessa” Specialized Hospital, School of Medicine, Addis Ababa University. Methods: This is a retrospective descriptive study from January 2008 to June 2010. Age is estimated at age determination board using medical and skeletal criteria’s by a committee consisting of physicians from internal medicine, radiology and orthopedic departments. All subjects were having elbow and wrist x-rays, sexual maturity assessment and dental examinations. The final age (also referred as “board-age”) is determined/assigned based on the consensus made between the three physicians. This document is signed and strictly/confidentially compiled by the head of outpatient department. Data was collected based on prepared questioner through retrieval of subjects’ records/documents. Results: A total of 976 subjects, with male predominance 67.7%, have been evaluated by the board in the two years. Almost all had stated age range 5-22 years. Majority’s stated age falls in the age group 9-15(66.1%). 92% of subjects claim they are below 18 years of age.838(85.9%) subjects are from Addis Ababa. The board decided that 461 (47.2%) were between 16 and 17 years of age. There was less agreement between stated age and board age with (Kappa) κ score of 0.147. Radiologic age and board age had excellent agreement with κ score of 0.976 Conclusion: Radiologic age is cornerstone of age determination in our circumstance. Age determination is crucial for prosecution of young population using skeletal and clinical method. Most subjects tend to lower their age, hence attention should be given for evidence based age determination.
Palliative care provision for patients with chronic obstructive pulmonary disease
Abebaw Yohannes
Health and Quality of Life Outcomes , 2007, DOI: 10.1186/1477-7525-5-17
Abstract: Chronic obstructive pulmonary disease (COPD) is a major cause of morbidity and mortality worldwide [1,2]. Studies in the US have reported death rate from COPD doubled in the past two decades while significant decline occurred in deaths rate from other chronic diseases, for example, chronic heart disease and stroke [3,4]. The trends of increasing annual death rate of COPD was also marked by the first time the number of women dying from COPD surpassed men [5] in contrast to demographic changes in the general population. In the same period healthcare utilization was exponentially growing because patients with severe COPD were hospitalized three to four times per year and utilization of intensive care units for patients admitted with acute exacerbations of COPD in developed countries [1,4-6]. In the US in 2005, the National Heart, Lung and Blood Institute reported that the annual direct medical costs for COPD were about $21.8 billion and indirect costs (restricted days, lost workdays, and productivity) estimated at $17 billion respectively [7]. Au and co-workers [8] examined retrospectively patients who died in the previous six-months with advanced stage COPD in comparison with lung cancer patients and their healthcare utilization. They found that patients with COPD had 'twice the odds of being admitted to an intensive care unit and received fewer opiates and benzodiazepine compared with patients with lung cancer'. The total direct medical costs were $4,000 higher for COPD patients compared with lung cancer patients because of the intensive care unit utilization [8]. A recent population survey that investigated the health status of COPD patients in five European countries and US have reported that a significant but minority of European Union patients reported that their 'health status was worse than death' because of significant impairment in physical daily activities, severe dyspnoea, fatigue, pain and psychological morbidity due to anxiety and depressive symptoms [9].
Rickets review and patterns as seen at Orotta Pediatric National Referral Hospital
T Yohannes
Journal of the Eritrean Medical Association , 2007,
A brief review on intraosseous (IO)cannulation and outcome analysis of patients managed by intraosseous (IO) route
T Yohannes
Journal of the Eritrean Medical Association , 2007,
Metal Porphyrins for Oxygen Reduction in PEMFC
Yohannes Kiros
International Journal of Electrochemical Science , 2007,
Abstract: A short literature review on alternative catalysts for the cathodic oxygen reduction in acid (H2SO4) and polymer electrolyte membrane fuel cell (PEMFC) with special emphasis on pyrolyzed macrocycles and precursor materials from metals, organic molecules and N-containing elements has been conducted. Furthermore, various catalytic materials comprising two different concentrations of iron and cobalt tetramethoxyphenyl porphyrins and perovskites were prepared by both the impregnation and precipitation reactions. Screening tests of the individual catalytic materials and their mixtures were carried out in half-cell measurements using the rotating disc electrode (RDE) in 0.5M H2SO4 and at room temperature. Cyclic voltammograms were recorded at a scan rate of 10 mV s-1 both with and without rotations. The peak potential at 0 rpm was used to study and compare the catalytic activities towards oxygen reduction reaction (ORR). Concentrations of 30wt% Fe and Co/TMPP have shown increased performance characteristics, while those with lower or increased contents, acid-treated and mixed with perovskite have displayed lower activities. Polarization data for the catalyst containing 30wt% FeTMPP was also obtained. Acid leaching of the pyrolysis products has resulted in substantial decrease of the metals from the pyrolysis products supported on carbon. TEM, BET-surface area and EDX analyses on the samples have shown high aggregation of the metals with crystalline structure, surface areas depending on the compositions of the catalysts and increased surface concentration of the metals with absence of nitrogen on the moiety.
Poincaré series of monomial rings with minimal Taylor resolution
Yohannes Tadesse
Le Matematiche , 2012,
Abstract: We give a comparison between the Poincaré series of two monomial rings: R = A/I and R_q = A/I_q where I_q is a monomial ideal generated by the q’th power of monomial generators of I. We compute the Poincaré series for a new class of monomial ideals with minimal Taylor resolution. We also discuss the structure a monomial ring with minimal Taylor resolution where the ideal is generated by quadratic monomials.
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