AXSIS (Yeditepe Üniversitesi)
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Functional latissimus dorsi island pedicle musculocutaneous flap to restore elbow flexion in replantation or revascularisation of above-elbow amputations
No full textoai:openaccess.yeditepe.edu.tr:20.500.11831/8403Two total and one subtotal above-elbow amputations had replantation or revascularization for their severely damaged upper extremities followed by functional latissimus dorsi island pedicle musculocutaneous flap to restore elbow flexion. The mean follow-up was 68 months (range: 14 to 121 months). At final follow-up examinations, the patients had sufficient range-of-motion of their elbows with good strength. Restoring elbow function eliminates one of the most important limiting factors for above-elbow replantations. Functional latissimus dorsi island pedicle musculocutaneous flap is very reliable, has minimal donor-site morbidity and offers a wider choice when deciding about arm replantation in the upper arm region by providing a chance of restoring functions.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
High resolution electronic absorption spectra of anisole and phenoxyl radical
No full textHigh resolution absorption spectra of anisole and phenoxyl radical has been recorded in the vapor phase at room temperature by flash photolysis technique, and subsequent reactions have been investigated by kinetic spectroscopy. It was possible to follow the kinetics of the radical's decay which occurred predominantly by bimolecular recombination. The concentration of the phenoxyl radical calculated from the concentration of diphenoxyl molecules formed in the reaction cell during the optical pumping. The absolute extinction coefficient of this radical was measured from the absorption band at 291 nm, and found to be 0.95 × 10+4 mol-1 l cm-l. © 2002 Elsevier Science B.V. All rights reserved.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
A modified method of microvascular autogenous interposition vein grafting for vascular reconstruction
No full textA modified technique of vein grafting for vascular reconstruction that facilitates surgical procedures by preventing size, diameter, and length discrepancies as well as twisting, is presented. The distal end of the harvested vein graft is ligated, and the graft is inflated with heparinzed saline. The determination of the small side branches makes ligation easier. Gentle hydrostatic dilation relieves spasm, straightens the vein, and ligation of the proximal end is then performed under tension. As the vein inflated with heparinzed saline achieves maximum size, diameter, and length without torsion, the sausage-like graft can easily be interposed in tunnels, passages, or soft tissues between recipient vessel gaps. As the graft is under adequate tension, it is easy to determine its appropriate length, size, and diameter. Suturing is carried out using double approximating clamps. The graft will not twist or kink, as it is anastomosed under tension. The clamps are left in place until completion of the distal and proximal anastomoses. The distal clamp is released first. With this simple modification, most of the technical difficulties, such as length, size, and diameter discrepancies, and twisting and torsion of the graft, can be eliminated. The risk of failure due to vascular thrombosis at the anastomotic sites is lowered, as the vein graft is filled with heparinzed saline, and no blood flow is permitted during the reconstruction. The surgeon also saves time with this easy, simple, and feasible method.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Media content analysis by MORN to determine anticipated megatrends in Turkey: A factor-analytic approach
No full textThe megatrends in Turkey were discussed. Media content analysis by MORN was done using factor-analytic approach. Results showed that most of the respondents disagree on the trends obtained from Germany and Austria. It was also found that respondents believe that technological developments cause social problems such as unemployement and energy consumption rationing.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Turbo coded signals over wireless local loop environment
No full textIn this paper, the performance of turbo coded signals are investigated over Wireless Local Loop (WLL) environment with no side information on the phase noise and no channel state information (CSI). We assume that the transmitter and the receiver are point-to-point microwave links, separated by WLL which is modelled as 1Dn/Partial Response Microwave Channel (PMRC) with realizable and practical medium parameters. Here, the combined effects of the nonideal coherent receiver on the phase of the received amplitude and of a noisy carrier reference are considered, each modelled by the Rayleigh and Tikhonov distributions respectively. As an example, the jitter performance of turbo coded signals are evaluated over 1D/PRMC with effective signal-to-noise ratio in the carrier tracking loop, fading parameter, iteration number and frame data block size. The numerical results clearly demonstrate the error performance degradation due to both amplitude fading and phase noise process.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Role of side branches in determining suitable arterial segments for anastomosis in avulsion injuries: Experimental studies
No full textThe role of side branches, when the parent arterial trunk is stretched, with emphasis on preventing the effects of avulsion injury, was investigated in an experimental model. In ten New Zealand rabbits, the femoral arteries were isolated with and without side branches in the left and right legs, respectively, and controlled longitudinal traction was applied. The elongation of the arteries just before avulsion rupture at each side, with and without side branches, was compared, by measuring the initial and final length from the inguinal ligament to the mid-point of the distance between the inguinal ligament and the saphenous bifurcation. Side branches were observed to be tethered in a way that resisted elongation of the trunk artery. Arteries without side branches in the right legs elongated more, as they lacked the fixating and protective support provided by the side branches. Comparison of the two legs, with and without side branches, showed an average of 50 percent more arterial elongation, resulting in severe injury to the arteries without side branches. In the light of these results, the authors suggest performing microsurgical arterial anastomosis after resection past a minimum of two unruptured branch points of the avulsed part, in order to obtain a safer arterial segment for a better patency rate.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
A Labor Management Paradox: Unexpected Consequences from Churing Personnel
No full textNote:unavThe Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Kinetic and spectroscopic study of the phenoxyl radical
No full textFormation and decay of the phenoxyl radical in the vapor phase were studied by flash photolysis technique at room temperature and subsequent reactions have been investigated by kinetic spectroscopy and gas liquid chromotography. The extinction coefficient of this radical was measured from the absorption band at 291 nm, and found to be 0.95 × 104 Mol-1.1.cm-1.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
High resolution discreate optical absorption spectra of spectroscopically pure silicon dioxide in UV-C
No full textUltraviolet light induced high resolution optical absorption spectra of high purity silicon dioxide have been studied. An ultraviolet discreate absorption spectra were recorded photographically between 200-300 nm. Resonance fluorescence was observed at 288.2 nm, and around this region, Raman resonance scattering were also recorded at room temperature by flash photolysis technique.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive
Detection of thoracotomy-induced alterations in cell- and humoral-mediated immune response
No full textObjective: It is well known that thoracotomy leads to several complications. In this study, effects of thoracotomy on cellular and humoral immunities have been investigated. Leukocyte counts and lymphocyte counts of 100 patients operated by thoracotomy have been determined preoperatively and on the postoperative 3rd hour, and 1st, 2nd, 3rd, 5th days. Also lymphocyte surface markers (CD3, CD4, CD8, CD4/CD8, CD19, CD16/56) and immunoglobulin levels (IgG, IgA, IgM, IgE) in 40 out of 100 patients in the preoperative period and postoperatively twice on 7th day and then in the 3rd week have been detected. Materials and methods: For the methodology hemocounter, flow cytometer, immunoprecipitation, and enzyme-linked immunosorbent assay were used. Results: A marked increase in leukocyte count while a marked decrease in lymphocyte count has been observed after thoracotomy (P0.2). Conclusion: According to these results, leucocytosis occurred but lymphocyte count decreased in the early postoperative period. Immunoglobulin levels and subpopulation of lymphocytes were not affected from the operative stress. © 2002 Elsevier Science B.V. All rights reserved.The Yeditepe University Open Access System is a compendium of indexed publications. Copyright and usage rights may be held by publishers and/or authors. The collection was established for the scientific publications prepared by Yeditepe University academicians and is to be found in the institutional archive.Materials and methods: For the methodology hemocounter, flow cytometer, immunoprecipitation, and enzyme-linked immunosorbent assay were used