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Search Results: 1 - 10 of 150131 matches for " H;Yildiz "
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Dynamic Arbitrageurs’ Long-Run Impacts on Convertible Bond Issuers’ Stock Prices  [PDF]
Serhat Yildiz
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.89099
Abstract: I examine convertible bond arbitrageurs’ long-run impact on convertible bond issuers’ stock prices. I find a negative relation between arbitrage activity around convertible bond issues and convertible bond issuers’ long-run stock returns. Average three-year holding period return of convertible bond issuers with no-arbitrage activity around their convertible bond issues is two times larger than that of convertible bond issuers with arbitrage activity around their convertible bond issues. Overall, I show that convertible bond arbitrageurs’ price impact is not limited to short-term [1], but it also has a long-term component.
The complete genome sequence of Vibrio cholerae: a tale of two chromosomes and of two lifestyles
Gary K Schoolnik, Fitnat H Yildiz
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-3-reviews1016
Abstract: Vibrio cholerae O1 causes Asiatic cholera, a purging diarrheal illness that can kill an adult within 24 hours. Its most intriguing and least understood feature, however, comes from the study of its annual epidemic profile in the Bengal region of Bangladesh and India. There, nearly all cases each year occur in a synchronized, massive outbreak in the months of October and November, just as the monsoon rains decline [3]. During most other months of the year, cholera cases occur sporadically or not at all. This epidemic profile and its correlation with major transitions of climate point to the following: V. cholerae O1 resides in a stable environmental reservoir; then, seasonally determined changes in rainfall and sunlight trigger its periodic and transient emergence as a human pathogen [4].Between epidemics, V. cholerae O1 lives in natural aquatic habitats formed by the confluence of the Ganges and the Brahmaputra rivers. All the physiochemical and ecological features of this system are dramatically influenced by the monsoon climate. Within this ecosystem, five distinctive stages have been proposed to comprise the V. cholerae environmental life cycle: an independent, free-swimming form; a symbiont of phytoplankton [5]; a commensal of zooplankton [6]; a viable, but not culturable state [7]; and a biofilm community attached to abiotic or chitinous surfaces (Figure 1) [8,9,10,11,12]. Thus the functional repertoire of the V. cholerae O1 genome must be unusually broad as it accommodates two, quite distinctive, lifestyles: the milieu of the human intestine and long term residence in aquatic habitats that are subject to climate-determined changes of the microenvironment [13].The functional annotation of the V. cholerae O1 sequence [2] sheds light on this remarkable capacity. In particular, the distribution of genes of known function between the large and small chromosomes of the organism provides tantalizing clues about how the two-chromosome configuration of the Vibrionaceae
Effect of using different lignocellulosic wastes for cultivation of Pleurotus ostreatus (Jacq.) P. Kumm. on mushroom yield, chemical composition and nutritional value
A Dundar, H Acay, A Yildiz
African Journal of Biotechnology , 2009,
Abstract: In this study, the mushroom yield, chemical composition and nutritional value of Pleurotus ostreatus (Jacq.) P. Kumm. cultivated in wheat stalk (WS), millet stalk (MS), soybean stalk (SS) and cotton stalk (CS) were determined. Fresh mushroom yield amounts (100 g of substrate, 70% moisture) obtained from WS, CS, MS and SS substrate media were 17.9, 14.3, 22.7 and 31.5 g, respectively. Samples of mushroom cultivated on different culture mediums were analysed for protein, energy, ash, fat, dietary fibre, carbohydrate, moisture, vitamins (thiamin, riboflavin, pyridoxin and niacin) and amino acid contents.
Yield performances and nutritional contents of three oyster mushroom species cultivated on wheat stalk
A Dundar, H Acay, A Yildiz
African Journal of Biotechnology , 2008,
Abstract: This study was conducted to determine nutritive value and yield performance of the three types of oyster mushroom; Pleurotus eryngii (Dc. Ex Fr.) quel), Pleurotus ostreatus (Jacq.: Fr.) Kumm.) and Pleurotus sajor-caju (Fr.) Singer, cultivated on wheat stalk. The total fresh mushroom yields obtained with 100 g material (70% misture) after the three harvests and the total harvest time were calculated. P. sajor-caju gave the highest yield as 20.2 g. The yield of P. ostreatus was 17.9 g and the lowest yield was P. eryngii, 4.5 g. Total harvest time of mushrooms were determined. As the P. sajor-caju was harvested in 67.46 days, P. ostreatus was harvested in 82.64 days and P. eryngii was harvested in 85.27 days. For chemical composition analysis the fruiting bodies of mushrooms were collected after the first productive flow and dried in an oven at 60°C at a constant weight and kept under refrigeration at 4°C. Energy, protein, fat, carbohydrate, dietary fibre, moisture, ash (g in 100 g dried matter) and amino acids (mg in 1 g dried matter) of mushrooms were analysed. In P. eryngii and P. sajor-caju the highest amount of amino acid was from aspartic acid and the lowest was from methionine. The highest and the lowest amino acid amount in P. ostreatus were from glutamic acid and methionine, respectively. The histidine amino acid was just detected in P. eryngii but hydroxy-L-proline was not detected in mushrooms. The energy (kcal/100 g dried matter), fat, protein, carbohydrate, dietary fibre, moisture and ash (g/100 g dried matter) values of P. eryngii were 276.33, 11.95, 7.50, 39.85, 28.45, 7.23 and 4.89, respevtively. These values for P. ostreatus were 243.66, 17.12, 2.60, 37.87, 30.25, 7.39 and 4.78, respectively. The values for P. sajor-caju were 229.22, 16.75, 1.15, 37.72, 30.67, 7.42 and 5.84, respectively.
Biquadratic Filter Applications Using a Fully-Differential Active-Only Integrator
H. A. Yildiz,A. Toker,S. Ozoguz
Radioengineering , 2013,
Abstract: A new class of active filters, real active-only filters is described and possible implementation issues of these filters are discussed. To remedy these issues, a fully-differential active-only integrator block built around current controlled current conveyors is presented. The integration frequency of the proposed circuit is adjustable over a wide frequency range. As an application, a real active-only filter based on the classical two-integrator loop topology is presented and designed. The feasibility of this filter in a 0.35μm CMOS process is verified through SPECTRE simulation program in the CADENCE design tool.
A high-origin anterior tibial artery and its current clinical importance
Yildiz S,Yazar F,Ozan H
International Journal of Anatomical Variations , 2010,
Abstract: Arthroscopic knee surgery is recently a very often performed surgical procedure. Surgical neurovascular characteristics and anatomical variations have gained importance due to such surgical interventions in that region. The aim of this study is to underline the clinical importance of a high origin anterior tibial artery from the popliteal artery with its anatomical measurements. We report a high origin anterior tibial artery from the left popliteal artery descending on the anterior surface of the popliteus muscle of a 75-year-old male cadaver.Our opinion is that surgical complications due to anatomical variations are common. Therefore, the high origin anterior tibial artery from the popliteal artery and its relation to the popliteus muscle is an important anatomical variation which should be paid attention during knee joint surgery, total knee arthroplasty and angiographic evaluations.
Fractional Super Lie Algebras and Groups
H. Ahmedov,A. Yildiz,Y. Ucan
Physics , 2000, DOI: 10.1088/0305-4470/34/33/306
Abstract: n^{th} root of a Lie algebra and its dual (that is fractional supergroup) based on the permutation group $S_n$ invariant forms are formulated in the Hopf algebra formalism. Detailed discussion of $S_3$-graided $sl(2)$ algebras is done.
Anatomical variations of the clavicle and main vascular structures in two pediatric patients: subclavicular vein cannulation with supraclavicular approach
Oksuz H,Senoglu N,Yildiz H,Demirkiran H
International Journal of Anatomical Variations , 2009,
Abstract: Central venous catheterization is a routine application in the management of patients in critical condition. However, the placement of central venous catheters is not without risk. The standard technique for central venous cannulation includes the use of anatomical landmarks. However, an ultrasound-guided method is recommended for catheterization in high-risk patients. In this report, we present two pediatric cases which had anatomical variations of the clavicles and main vascular structures due to cerebral palsy and were treated with mechanical ventilation because of pneumonia. The subclavian vein cannulation was performed using a supraclavicular approach under ultrasound guidance in both cases. We conclude that central venous catheterization of critical patients who have anatomical variations must be performed under ultrasound guidance as it provides greater safety and a higher success rate.
Comparison of fatigue behaviour of eight different hip stems: a numerical and experimental study  [PDF]
Mahmut Pekedis, Hasan Yildiz
Journal of Biomedical Science and Engineering (JBiSE) , 2011, DOI: 10.4236/jbise.2011.410080
Abstract: In this study, finite element analysis was used to investigate the fatigue behavior of eight different hip stems. All of the prostheses investigated in the analysis are already being used in Turkish orthopaedic surgery. All stems were compared with each other in terms of fatigue, deformation and safety factors. Primary analysis was applied on three of the stems, which were tested experimentally. It was observed that the simulation and the experimental results are in good agreement with each other. After determining the reliability of the numerical method, the analysis was applied on all other stems. To obtain a more realistic simulation, boundary conditions were applied according to standards specified in the ISO 7206-4 standard. Three different types of materials were selected during analysis. These materials were Ti-6Al-4V, cobalt chrome alloy and 316L. Minimum fatigue cycles, critical fatigue areas, stresses and safety factor values have been identified. The results obtained from the finite element analysis showed that all stems were safe enough in terms of fatigue life. As a result of fatigue analysis, all stems have been found to be successful, but some of them were found to be better than the others in terms of safety factor. The current study has also demonstrated that analysing hip stems with the finite element method (FEM) can be applied with confidence to support standard fatigue testing and used as an alternative. Further studies can expand the simulations to the clinical relevance due to complex physical relevance.
Unsaponifiable Matter in Carnuba (Cera carnuba) Wax, a Modification of the USP/NF and FCC Methods  [PDF]
Yusuf Yildiz, Manjista Dasgupta
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.78056
Abstract: Carnuba wax consists chiefly of myricyl cerotate (MW 817.4) and small quantities of free cerotic acid (C26H52O2, Mw 396.7) and myricyl alcohol (C30H62O, mp 90°C). Of the two common extraction solvents, ethyl ether or petroleum ether, Lewkowitsch prefers the former. Concerning separation of phases, he advocates addition of small amounts of alcohol or caustic, and he also states that formation of a flocculant layer between the aqueous layer and the solvent does not interfere with the correct estimation of the unsaponifiable matter. These statements were not corroborated in the hands of this chemist. The “Unsaponifiable Matter” in oils or and fats, which consist mainly of hydrocarbons, sterols and aliphatic alcohols of high molecular mass that are not saponifiable by alkali hydroxides but are soluble in the ordinary fat solvents, and to products of saponification that are soluble in such solvents. Carnuba wax, a rather expensive wax, may be adulterated with less expensive paraffin by dishonest merchants. ASTM has a method for determining paraffinic material in carnuba wax. It uses heptanes at its boiling point to dissolve the wax, apply it to a silica gel column, and elute only the nonpolar (i.e. alkane) material. The method has the disadvantage of using a large volume of haptane, nor is it called for by either US Pharmacopeia/National Formulary (USP/NF) or Food Chemicals Codex (FCC). The test for unsaponifiable matter on pure carnuba wax will yield a result of 50.0% - 55.0%, while a higher result will betray the presence of paraffin adulterants.
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