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Articles 18661 - 18690 of 18792

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Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Botany

No abstract provided.


An Autecological Study On Iris Pseudacorus L. (Iridaceae), Ali Engi̇n, Nezahat Kandemi̇r, Gülcan Şenel, Mustafa Özkan Jan 1998

An Autecological Study On Iris Pseudacorus L. (Iridaceae), Ali Engi̇n, Nezahat Kandemi̇r, Gülcan Şenel, Mustafa Özkan

Turkish Journal of Botany

The ecological properties of Iris pseudacorus L., a marsh plant species, were investigated. The analysis of N%, P% and K% in the below-ground and above-ground parts of the plant was carried out. In addition, soil samples were collected and their physical and chemical aspects were analyzed.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Botany

No abstract provided.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Botany

No abstract provided.


The Influence Of Solvents On Formation Of The Molecular Geometry Of [{Fe(Salphen)}_2o], Mehmet Kabak, Ayhan Elmali Jan 1998

The Influence Of Solvents On Formation Of The Molecular Geometry Of [{Fe(Salphen)}_2o], Mehmet Kabak, Ayhan Elmali

Turkish Journal of Physics

The crystal structure and magnetic properties of the complex (I)=[$\{$Fe(salphen)$\}_2$\-O]$\cdot$(C$_4$\-H$_8$SO) and (II)=[$\{$Fe(salphen)$\}_2$O]$\cdot$(C$_4$H$_8$O$_2$)\- (salphen H$_2$=N,N'-o-phenylenebis\-(salicylidene-imine)) were recently reported [1, 2]. This complex crystallized with the solvents of dimethyl sulfoxide and dioxane. In this paper, we investigate the influence of the solvents on the formation of the molecular geometry and study the orbital mechanism of the magnetic super-exchange interactions of this complex.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Veterinary & Animal Sciences

No abstract provided.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Electrical Engineering and Computer Sciences

No abstract provided.


Dold-Kan Type Theorems For N-Types Of Simplicitial Commutative Algebras, Z. Arvasi̇, M. Koçak Jan 1998

Dold-Kan Type Theorems For N-Types Of Simplicitial Commutative Algebras, Z. Arvasi̇, M. Koçak

Turkish Journal of Mathematics

A functor from simplicial algebras to crossed \( n \)-cubes is shown to be an embedding on a reflexive subcategory of the category of simplicial algebras that contains representatives for all \( n \) types.


From Simplicial Groups To Crossed Complexes, Z. Arvasi̇ Jan 1998

From Simplicial Groups To Crossed Complexes, Z. Arvasi̇

Turkish Journal of Mathematics

In this paper, we will give a short proof of the construction of the crossed complex of groups by using the higher order Peiffer elements.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Mathematics

No abstract provided.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Zoology

No abstract provided.


Ecology And Biology Of Allactaga Elater, Allactaga Euphratica Andallactaga Williamsi (Rodentia: Dipodidae) In Turkey, Ercüment Çolak, Nuri Yi̇ği̇t Jan 1998

Ecology And Biology Of Allactaga Elater, Allactaga Euphratica Andallactaga Williamsi (Rodentia: Dipodidae) In Turkey, Ercüment Çolak, Nuri Yi̇ği̇t

Turkish Journal of Zoology

The young of Allactaga williamsi and Allactaga euphratica were born at an average weigth of 2.51 and 2.74 g., respectively. Litter size ranged from 3 to 6 with an average of 4.8 in A. williamsi, and it changed from 4 to 8 with an average of 4.8 in A. euphratica , A. williamsi breeds during the period of March to August, A. williamsi and A. euphratica produced 2 and 2 or 3 litters per year, respectively. Allactaga elater has four types of burrows: winter, summer, reproduction and temporary. A. williamsi and A. euphratica have two types of burrows: reproduction and …


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Zoology

No abstract provided.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Mathematics

No abstract provided.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Medical Sciences

No abstract provided.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Medical Sciences

No abstract provided.


Detection Of Crown Gal Agent ( Agrobacterium Tumefaciens) Ingrapevine Propagating Material, Kemal Benli̇oğlu, Meriç Özakman Jan 1998

Detection Of Crown Gal Agent ( Agrobacterium Tumefaciens) Ingrapevine Propagating Material, Kemal Benli̇oğlu, Meriç Özakman

Turkish Journal of Agriculture and Forestry

Polyclonal antiserum produced against Agrobacterium tumefaciens (biovar 3) reacted in immunofluorescent test with biovar 3 strains of A.tumefaciens,causal agent of crown gal, from Central Anatolia. The antiserum did not react with A.tumefaciens biovar 1 (except for 1/200 dilution), biovar 2, other plant pathogens and symbionts. Vacuum extraction procedure were applied to recover A.tumefaciens from xylem vessels of one year old dormant grape cuttings. IFAS and selective media were used to detect bacteria. A.tumefaciens (biovar 3) was recovered from six cuttings of 8 infected vines and seven of 150 apparently healthy vines in Central Anatolia. The sensitivity thershold of the vacuum …


Operation Research Methods In The Forest Management Planning, Altay Uğur Gül Jan 1998

Operation Research Methods In The Forest Management Planning, Altay Uğur Gül

Turkish Journal of Agriculture and Forestry

The purpose of this study is to approximate the actual forest state to an aptimal forest state within different conversion period lenghts, to ensure the sustainability of allowable cut over planning horizon, to maximize the total present net value calculated with financial analysis. A linear programming model was developed and used to test 436 different strategies for planning of Gazipasa Forest Management Unit. The value of the objective function of the solution that maximized the total present net value is 63352171000 TL and the amount of the total volume is 9054041 m3. For the first plan period, when the objective …


An Investigation On The Transportation By Trucks At Mountainously Regions, H. Hulusi Acar Jan 1998

An Investigation On The Transportation By Trucks At Mountainously Regions, H. Hulusi Acar

Turkish Journal of Agriculture and Forestry

Artvin Forest District, which is the best example for mountainous forest areas in Turkey, was selected a suitable study area for this investigation. Data which were collected by using the repetition time technique were analyzed. Sixty six percent of the planned forest road network in Artvin Forest District has been completed. Now, the average forest road density in the district is 10.5 m/ha. The number of forest trucks in the region is enough. Trucks are 20 years old on average. These trucks are generally 3 axed and AS 600 Dodge type. In the region, transportation by trucks takes place between …


Dc Conduction In Electrochemically Synthesized Polypyrrole Films, Akif Kaynak Jan 1998

Dc Conduction In Electrochemically Synthesized Polypyrrole Films, Akif Kaynak

Turkish Journal of Chemistry

DC conductivity measurements were performed by modified four-probe rig on electrochemically synthesized polypyrrole films at a temperature range of -30^oC to 120^oC. Conductivity increased with temperature. The temperature dependence of conductivity was very high for lightly doped polymers, decreasing as the doping level increased. The model used to describe the conduction process was the conduction model originally developed for amorphous silicon by Mott and Davis. When applied to conducting polymers, it assumes that electron transport originates from localized or fixed states within the polymer chain. The charge transfer between the chains takes place by hopping, referred to as phonon-assisted hopping, …


Electrocatalytic Properties Of Platinum Doped Polyaniline And Polypyrrole Electrodes, F. Kadirgan, F. Fiçicioğlu, İ. Beceri̇k Jan 1998

Electrocatalytic Properties Of Platinum Doped Polyaniline And Polypyrrole Electrodes, F. Kadirgan, F. Fiçicioğlu, İ. Beceri̇k

Turkish Journal of Chemistry

This review paper aims to show how the electrochemical behaviour of polyaniline (PANI) and polypyrrole (PPy) electrodes modified by platinum help to improve the oxidation of organic molecules such as methanol, ethylene glycol and glucose. Although the amount of platinum deposited was very small, i.e., 0.1 mg.cm$^{-2}$, the catalytic activity obtained was comparable to bulk platinum. Another notable point is the reduction of the poisoning effect, which is the main problem faced in the electrooxidation of organic molecules for fuel cell applications.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.


The Amido And Bisalkoxo-Complexes Of [Tri(3,5-Dimethylpyrazolyl)Borato]Molydenum Nitrosyl, Işıl Topaloğlu Jan 1998

The Amido And Bisalkoxo-Complexes Of [Tri(3,5-Dimethylpyrazolyl)Borato]Molydenum Nitrosyl, Işıl Topaloğlu

Turkish Journal of Chemistry

In this study, the amido nitrosyl molybdenum complex, [Mo{HM(3,5-Me_2C_3HN_2)_3}(NO)Cl(NH_2)], was prepared. This compound reacts with alocohols, yielding the bisalkoxo complexes, [Mo{HM (3,5-Me_2C_3HN_2)_3}(NO)(OR)_{2}] (R = Me, Et, Pr^n, Bu^n). The new complexes were analyzed by IR and ^1H-NMR spectroscopy.


The Removal Of Organic Sulfur From Two Turkish Lignites By Chlorinolysis, Yücel Y. Kadioğlu, Semra Karaca, Samih Bayrakçeken, M. Şahin Gülaboğlu Jan 1998

The Removal Of Organic Sulfur From Two Turkish Lignites By Chlorinolysis, Yücel Y. Kadioğlu, Semra Karaca, Samih Bayrakçeken, M. Şahin Gülaboğlu

Turkish Journal of Chemistry

The removal of organic sulfur from two Turkish lignites by chlorinolysis with chlorine gas in water and water-carbon tetrachloride media at ambient pressure was examined. The effects of stirring speed (5-20 s^{-1}), particle size (250-425, 150-180 and 74-88 \mu m), temperature (13-70°C) and time (0-10800 s) were investigated. Significant portions of the organic sulfur in the coal samples were removed.


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.


Electrochemical Polymerization And Analysis Of Some Aniline Derivatives, Bekir Sari, Muzaffer Talu Jan 1998

Electrochemical Polymerization And Analysis Of Some Aniline Derivatives, Bekir Sari, Muzaffer Talu

Turkish Journal of Chemistry

In this study, conductive homopolymers of o-chloroaniline, p-bromoaniline and N-methylaniline were synthesized electrochemically in perchloric acidic solution and their properties were analyzed. Initially, the maximum oxidation potential values of these monomer solutions were determined by Cyclic Voltammetry (CV). Their conductive polymers were then synthesized under a nitrogen atmosphere using a potentiostat. FTIR spectra were taken in order to analyze the structural properties of the resulting polymers. Thermogravimetric analysis (TGA) was conducted and surface micrographs were taken by a Scanning Electron Microscope (SEM). The conductivity levels of the polymers were determined by the Four Probe technique. Magnetic properties of the samples …


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.


Separation Of Molybdenum, Vanadium And Nickel By Liquid-Liquid Extraction, T. Coşar, R. Zi̇yadanoğullari Jan 1998

Separation Of Molybdenum, Vanadium And Nickel By Liquid-Liquid Extraction, T. Coşar, R. Zi̇yadanoğullari

Turkish Journal of Chemistry

Elements in the ash of asphaltites that is used in thermal central for power generation units are Mo, V, U, Ti and Ni. The main goal of this study was to separate molybdenum, vanadium and nickel from the aqueous solution. The quantities of the above elements in solution were in the range of 50-80 ppm. The separate these elements from solution, the liquid-liquid extraction method was applied to samples. Alamine 336 was used as extractant. During the reduction-oxidation processes, single and multiple extraction methods were applied to the solution in combination. The quantities of molybdenum, vanadium and nickel in the …


Cover And Contents Jan 1998

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.


Antrhrax Meningitis, Birdal Yorgancigi̇l, Erdoğan Sevük, Muzaffer Aydemi̇r, Mustafa Demi̇rci̇, Mehmet Doğanay Jan 1998

Antrhrax Meningitis, Birdal Yorgancigi̇l, Erdoğan Sevük, Muzaffer Aydemi̇r, Mustafa Demi̇rci̇, Mehmet Doğanay

Turkish Journal of Medical Sciences

No abstract provided.