Delaere P.,Issyk-Kul State University
Bulletin et mémoires de l'Académie royale de médecine de Belgique | Year: 2011
Reconstruction of long-segment tracheal defects requires a vascularized allograft. We report successful tracheal allotransplantation after indirect revascularization of the graft in a heterotopic position. Immunosuppressive therapy was administered before the operation, and the allograft was wrapped in the recipient's forearm fascia. Once revascularization was achieved, the mucosal lining was replaced progressively with buccal mucosa from the recipient. At four months, the tracheal chimera was fully lined with mucosa, which consisted of respiratory epithelium from the donor and buccal mucosa from the recipient. After withdrawal of immunosuppressive therapy, the tracheal allograft was moved to its correct anatomical position with an intact blood supply. No treatment-limiting adverse effects occurred.
Mahmud A.M.,Mekelle University |
Mahmud A.M.,Research Group Electa ESAT |
Kahsay M.B.,Mekelle University |
Hailesilasie A.,Norwegian University of Science and Technology |
And 7 more authors.
Energy Procedia | Year: 2014
The global shift towards renewable energy is manifested in developing countries such as Ethiopia primarily because of continuous economic growth in the last two decades and secondly due to the vast untapped potential resources. In addition to other factors, the lack of accurate data of the resources has, however, hampered the development of solar energy technologies. The aim of this paper is to investigate the resource estimation by undertaking direct measurements at selected sites in the Northern part of Ethiopia. This paper presents an assessment of the solar energy resource based on the primary data collected between January 2011 and December 2012. The daily and monthly average global solar radiation is analyzed based on the 10 minute interval measurement retrieved from the data loggers. From the analysis it is seen that the measured values give a better accuracy and distribution of the global solar radiation than earlier Fig.s that were based on satellite images and model calculations. Furthermore, these results can be used to determine the solar resource potential of Northern Ethiopia for further energy development. © 2014 Published by Elsevier Ltd.
VAN DER WOLF J.,IITA |
JASSOGNE L.,IITA |
GRAM G.,IITA |
GRAM G.,Issyk-Kul State University |
VAAST P.,CIRAD - Agricultural Research for Development
Experimental Agriculture | Year: 2016
This paper presents the main features of a unique decision-support tool developed for selecting tree species in coffee and cocoa agroforestry systems. This tool aims at assisting in the selection of appropriate shade trees taking into account local conditions as well as needs and preferences of smallholder farmers while maximizing ecosystem services from plot to landscape level. This user-friendly and practical tool provides site-specific recommendations on tree species selection via simple graphical displays and is targeted towards extension services and stakeholders directly involved in sustainable agroforestry and adaptation to climate change. The tool is based on a simple protocol to collect local agroforestry knowledge through farmers’ interviews and rankings of tree species with respect to locally perceived key ecosystem services. The data collected are first analysed using the BradleyTerry2 package in R, yielding the ranking scores that are used in the decision-support tool. Originally developed for coffee and cocoa systems of Uganda and Ghana, this tool can be extended to other producing regions of the world as well as to other cropping systems. The tool will be tested to see if repeated assessments show consistent ranking scores, and to see if the use of the tool by extension workers improves their shade tree advice to local farmers. Copyright © Cambridge University Press 2016 This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sarieva G.E.,Issyk-Kul State University |
Kenzhebaeva S.S.,Al-Farabi Kazakh National University |
Lichtenthaler H.K.,Karlsruhe Institute of Technology
Russian Journal of Plant Physiology | Year: 2010
For the first time, the adaptive role of the rolling leaf trait for tolerance of wheat plants (Triticum aestivum L.) to the main factor of drought, high temperature, was demonstrated. Cv. Otan with high degree of this trait expression was more tolerant to temperature stress (40°C, 4 h during 2 days (2h/day)). Changes in parameters of chlorophyll fluorescence, Fv/Fm and RFd690, suggest that cv. Otan was tolerant to inhibition of photochemical activities of photosystem II (PSII) and photosystem I (PSI). Furthermore, high temperature had no effect on the rate of net photosynthesis (PN) in cv. Otan, although it decreased this parameter in the other wheat cultivars. The main factors, which provid for this tolerance, were adaptation of the photosynthetic pigment system by active accumulation of carotenoids, more stable structural organization of PSII and PSI, and their high photosynthetic activities, as well as efficient stomatal regulation of transpiration and supplying of mesophyll cells with CO2. It is hypothesized that the physiological role of the rolling leaf trait is the maintenance of adaptation potential by increasing the efficiency of water metabolism in the flag leaves of wheat under high temperature. © Pleiades Publishing, Ltd., 2010.
Assimilate export inhibition in Sugarcane yellow leaf virus-infected sugarcane is not due to less transcripts for sucrose transporters and sucrose-phosphate synthase or to callose deposition in sieve plates
ElSayed A.I.,Zagazig University |
ElSayed A.I.,University of Bayreuth |
Weig A.R.,University of Bayreuth |
Sariyeva G.,University of Bayreuth |
And 7 more authors.
Physiological and Molecular Plant Pathology | Year: 2013
Sink leaves, source leaves and internodes of four Hawaiian sugarcane cultivars were tested, whether the inhibition of SCYLV-caused assimilate export was due to lower sucrose synthesis activity, less sucrose transporter content or block of solute flow by callose deposition. The transcript levels of sucrose-phosphate synthase (SPSII) and sucrose transporter ShSUT4 were constant throughout sugarcane tissues, whereas the sucrose transporter ShSUT1A was highest in sink leaves and lowest in internodes. No differences in transcript levels were observed between the SCYLV-susceptible and -resistant cultivars and between SCYLV-infected and SCYLV-free sugarcane line.Callose deposition at the sieve plates and the pit fields between sieve tubes and companion cells, visualized by aniline blue-staining, was similar between SCYLV-infected and -free sugarcane. It is concluded that the reduction of assimilate export is neither due to lower sucrose transporter levels nor to a physical block of sieve tubes. © 2012 Elsevier Ltd.