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Articles 7051 - 7080 of 8705
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Prevalence Of Thermoactinomyces Thalpophilus And T. Sacchari Strains With Biotechnological Potential At Hot Springs And Soils From West Anatolia In Turkey, Ataç Uzel, Eli̇f Esi̇n Hameş Kocabaş, Erdal Bedi̇r
Prevalence Of Thermoactinomyces Thalpophilus And T. Sacchari Strains With Biotechnological Potential At Hot Springs And Soils From West Anatolia In Turkey, Ataç Uzel, Eli̇f Esi̇n Hameş Kocabaş, Erdal Bedi̇r
Turkish Journal of Biology
Hot spring sediment and soil samples from West Anatolia in Turkey were investigated for the occurrence of thermophilic Actinomycetes. Isolation was done using Actinomycetes isolation agar (AIA), starch casein agar and glycerol yeast extract agar at 55 °C. Extracellular protease activity of the isolates were screened by using AIA plus 1% casein according to the hydrolysis zones surrounding the colonies. Antimicrobial activities of the isolates were also screened by using streaked plate method against a panel of test bacteria. Identification of the isolates was made by cultural, physiological characteristics and 16S rDNA sequence similarity. Sixty-seven thermophilic Actinomycetes isolates were classified …
Influence Of Salinity On The Growth And Heavy Metal Accumulation Capacity Of Spirodela Polyrrhiza (Lemnaceae), Zeli̇ha Leblebi̇ci̇, Ahmet Aksoy, Fati̇h Duman
Influence Of Salinity On The Growth And Heavy Metal Accumulation Capacity Of Spirodela Polyrrhiza (Lemnaceae), Zeli̇ha Leblebi̇ci̇, Ahmet Aksoy, Fati̇h Duman
Turkish Journal of Biology
Given that the characteristic of free floating plants to uptake metals can have a positive effect on the efficiency of the remediation process of a wetland, it is important to investigate the factors that may impact the process of uptake of metals by the plants. By conducting this present study over a short duration of time, the effects of salinity on the growth, the content of the photosynthetic pigments (chlorophyll a, b, and carotenoid), and heavy metal uptake by Spirodela polyrrhiza were investigated. It was also observed that at a high level of salinity (100 and 200 mM NaCl) the …
Molecular Diversity Of Thermophilic Bacteria Isolated From Pasinler Hot Spring (Erzurum, Turkey), Ahmet Adigüzel, Kadri̇ye İnan, Fi̇kretti̇n Şahi̇n, Tüli̇n Arasoğlu, Medi̇ne Güllüce, Ali̇ Osman Beldüz, Özlem Bariş
Molecular Diversity Of Thermophilic Bacteria Isolated From Pasinler Hot Spring (Erzurum, Turkey), Ahmet Adigüzel, Kadri̇ye İnan, Fi̇kretti̇n Şahi̇n, Tüli̇n Arasoğlu, Medi̇ne Güllüce, Ali̇ Osman Beldüz, Özlem Bariş
Turkish Journal of Biology
The present study was conducted to determine the phenotypic and genotypic characterization of thermophilic bacteria isolated from Pasinler hot spring, Erzurum, Turkey. Fatty acid profiles, BOX PCR fingerprints, and 16S rDNA sequence data were used for the phenotypic and genotypic characterization of thermophilic bacteria. Totally 9 different bacterial strains were selected based on morphological, physiological, and biochemical tests. These strains were characterized by molecular tests including fatty acid and BOX profiles, and 16S rDNA sequence. The data of fatty acid analysis showed the presence of 14 different fatty acids in the 9 bacterial strains examined. Additionally, 5 of these fatty …
An Entomopathogenic Bacterium, Pseudomonas Putida, From Leptinotarsa Decemlineata, Hacer Muratoğlu, Zi̇hni̇ Demi̇rbağ, Kazim Sezen
An Entomopathogenic Bacterium, Pseudomonas Putida, From Leptinotarsa Decemlineata, Hacer Muratoğlu, Zi̇hni̇ Demi̇rbağ, Kazim Sezen
Turkish Journal of Biology
The Colorado Potato Beetle (CPB), Leptinotarsa decemlineata (Say) (Col.: Chrysomelidae), is a pre-eminent pest on solanaceous crops worldwide, and much research has focused on the different components of its variable population dynamics. L. decemlineata has developed resistance to insecticides used for its control. Consequently, alternative methods are needed urgently for the control of this pest. In this study, in order to find a more effective and safer biological control agent against L. decemlineata, we isolated a new bacterial isolate (Ld4) from L. decemlineata, and tested it for insecticidal effects on L. decemlineata larvae. Also, the insecticidal effect of Ld4 was …
Effects Of Plant Growth Promoting Rhizobacteria On Fruit Set, Pomological And Chemical Characteristics, Color Values, And Vegetative Growth Of Sour Cherry (Prunus Cerasus Cv. Kütahya), Hali̇l Karakurt, Recep Kotan, Fati̇h Dadaşoğlu, Rafet Aslantaş, Fi̇kretti̇n Şahi̇n
Effects Of Plant Growth Promoting Rhizobacteria On Fruit Set, Pomological And Chemical Characteristics, Color Values, And Vegetative Growth Of Sour Cherry (Prunus Cerasus Cv. Kütahya), Hali̇l Karakurt, Recep Kotan, Fati̇h Dadaşoğlu, Rafet Aslantaş, Fi̇kretti̇n Şahi̇n
Turkish Journal of Biology
This study was performed to determine effects of 4 plant growth promoting rhizobacteria (Bacillus subtilis OSU - 142, Bacillus megaterium M - 3, Burkholderia cepacia OSU - 7, and Pseudomonas putida BA - 8) alone and in combinations on fruit set of sour cherry trees (Prunus cerasus L., cv. Kütahya), and to investigate their resulting pomological and chemical characteristics as well as vegetative growth. All the tested bacterial strains alone or some of their combinations have a great potential to increase especially fruit set and plant vegetative growth, and indirectly affect fruit pomological and chemical characteristics. Therefore, they may be …
Expression Of Β-(1,3-1,4)-Glucanase Gene Of Orpinomyces Sp. Gmlf18 In Escherichia Coli Ec1000 And Lactococcus Lactis Subsp. Cremoris Mg1363, Uğur Çömlekci̇oğlu, Emi̇n Özköse, İsmai̇l Akyol, Feri̇t Can Yazdiç, Mehmet Sai̇t Eki̇nci̇
Expression Of Β-(1,3-1,4)-Glucanase Gene Of Orpinomyces Sp. Gmlf18 In Escherichia Coli Ec1000 And Lactococcus Lactis Subsp. Cremoris Mg1363, Uğur Çömlekci̇oğlu, Emi̇n Özköse, İsmai̇l Akyol, Feri̇t Can Yazdiç, Mehmet Sai̇t Eki̇nci̇
Turkish Journal of Biology
A gene encoding \beta-(1,3-1,4)-glucanase (licA) was amplified from Orpinomyces sp. GMLF18 and expressed in Escherichia coli. The DNA sequence of licA showed that the gene was 707 bp and encoded a protein with a molecular mass of 26 kDa that belongs to family glycosyl hydrolase 16. The main LicA activity was observed to be cell-associated for the licA containing transformant E. coli, and the enzyme expressed in E. coli showed the highest activity at pH 5.0-6.0 and at temperatures of 40-50 °C. The enzyme was found to be stable at 40 °C; however, 12% of LicA activity was lost at …
Seasonal Variations In Phytoplankton Composition And Biomass In A Small Lowland River-Lake System (Melen River, Turkey), Tülay Baykal, İlkay Açikgöz, Abel U. Udoh, Kazim Yildiz
Seasonal Variations In Phytoplankton Composition And Biomass In A Small Lowland River-Lake System (Melen River, Turkey), Tülay Baykal, İlkay Açikgöz, Abel U. Udoh, Kazim Yildiz
Turkish Journal of Biology
A series of studies were carried out to determine the succession and phytoplankton community of the Melen River in the Western Black Sea region of Turkey. The study was conducted at 6 stations at monthly intervals between May 2003 and April 2004. It was observed that the abundance and biovolume of phytoplankton were low in winter, though higher values were recorded in late spring and summer. Among the values noted, the spring peak was 534.38 × 10^5 ind. L^{-1} and 7384.8 mm^3 L^{-1} belonging to Peridinium sp. The most common diatom, Cyclostephanos dubius, was favoured by low discharge at stations …
Antibacterial Activity Of Bee Propolis Samples From Different Geographical Regions Of Turkey Against Two Foodborne Pathogens, Salmonella Enteritidis And Listeria Monocytogenes, Ayhan Temi̇z, Ayla Şener, Asli Özkök Tüylü, Kadri̇ye Sorkun, Beki̇r Sali̇h
Antibacterial Activity Of Bee Propolis Samples From Different Geographical Regions Of Turkey Against Two Foodborne Pathogens, Salmonella Enteritidis And Listeria Monocytogenes, Ayhan Temi̇z, Ayla Şener, Asli Özkök Tüylü, Kadri̇ye Sorkun, Beki̇r Sali̇h
Turkish Journal of Biology
The aim of the present study was to investigate the antibacterial activities of 25 propolis samples collected from various geographical regions of Turkey against 2 food-borne pathogens, Salmonella Enteritidis ATCC 13076 and Listeria monocytogenes ATCC 1462. The chemical compositions of ethyl alcohol extracts of the propolis (EEP) samples were determined by gas chromatography coupled to mass spectrometry. The main components of EEP samples were flavonoids, aromatic acid esters, aromatic alcohols, aromatic acids, aliphatic carboxylic acids, terpens, and aliphatic carboxylic acid esters. Antibacterial activities of the EEP samples were tested at 2 different dilutions of 1:10 and 1:100 (v/v). All EEP …
A Comparative Study On Alkaline Lipase Production By A Newly Isolated Aspergillus Fumigatus Mtcc 9657 In Submerged And Solid-State Fermentation Using Economically And Industrially Feasible Substrate, Akhila Rajan, A. Jayakumaran Nair
A Comparative Study On Alkaline Lipase Production By A Newly Isolated Aspergillus Fumigatus Mtcc 9657 In Submerged And Solid-State Fermentation Using Economically And Industrially Feasible Substrate, Akhila Rajan, A. Jayakumaran Nair
Turkish Journal of Biology
A comparative study of solid-state fermentation (SSF) and submerged fermentation (SmF) for the production of alkaline lipase from a new isolate, Aspergillus fumigatus MTCC 9657, using defatted rice bran (DFRB) as a substrate was studied. Different process parameters, such as incubation period, initial pH and incubation temperature, were optimised to achieve the maximum yield of the alkaline lipase. Maximum enzyme production (8.13 U/mL) was obtained by day 7 of incubation in SSF compared to day 4 in SmF at an optimum pH of 8.5 and ambient temperature of 30 °C. Lipase produced by SSF was stable over a period of …
Characterization Of Poly Phenol Oxidase In Two In Vitro Regenerated Cultivars Of Mucuna: Mucuna Pruriens L. And Mucuna Prurita H., Raghavendra Sathyanarayana, Vadlapudi Kumar, Chapeyil Kumaran Ramesh, Mahadevappa Parmesha, Mahaboob Habeebulla Moinuddin Khan
Characterization Of Poly Phenol Oxidase In Two In Vitro Regenerated Cultivars Of Mucuna: Mucuna Pruriens L. And Mucuna Prurita H., Raghavendra Sathyanarayana, Vadlapudi Kumar, Chapeyil Kumaran Ramesh, Mahadevappa Parmesha, Mahaboob Habeebulla Moinuddin Khan
Turkish Journal of Biology
Polyphenol oxidases (PPOs EC 1.14.18.1) were isolated from Mucuna pruriens and Mucuna prurita and confirmed as tyrosinases involved in L-DOPA production. PPOs were extracted by using a 0.05 M phosphate buffer, pH 7.0. The purified enzyme was resolved into a single band by PAGE, the enzyme was confirmed as PPO by activity staining, and SDS-PAGE analysis revealed that the purified PPO of both the species is a tetramer. Substrate specificity experiments were carried out with catechol, L-DOPA, L-tyrosine, and p-cresol. Of these, catechol was evaluated as the most suitable substrate based on the determined K_{m} and V_{max} values. The optimum …
Chemical Composition And Nutritional Value Of A Wild Edible Ectomycorrhizal Mushroom, Tricholoma Anatolicum, Erbi̇l Kalmiş, Hasan Yildiz, Bülent Ergönül, Fati̇h Kalyoncu, Mehmet Hali̇l Solak
Chemical Composition And Nutritional Value Of A Wild Edible Ectomycorrhizal Mushroom, Tricholoma Anatolicum, Erbi̇l Kalmiş, Hasan Yildiz, Bülent Ergönül, Fati̇h Kalyoncu, Mehmet Hali̇l Solak
Turkish Journal of Biology
The chemical composition and nutritional value of a wild edible ectomycorrhizal mushroom from southwestern Anatolia, Tricholoma anatolicum, were analyzed. Moisture, crude oil, protein, ash, total carbohydrate content, and mineral composition of the mushrooms studied, including Fe, Na, K, Zn, Cu, Ca, Cd, and Pb, were determined. The energy values of the samples were also calculated. The analyses were conducted during the 3 different growing stages of the mushrooms: mycelium, young fruiting bodies, and mature fruiting bodies. The highest values for moisture and crude oil contents were found to be in the mycelium, ash, and carbohydrate content of young fruiting bodies. …
The Optimization Of Adna Extraction Protocol And Sex Determination Of Bronze Age Individuals From Oylum Höyük (Kilis, Turkey), Serdal Arslan, Ayşen Açikkol, Ertan Mahi̇r Korkmaz
The Optimization Of Adna Extraction Protocol And Sex Determination Of Bronze Age Individuals From Oylum Höyük (Kilis, Turkey), Serdal Arslan, Ayşen Açikkol, Ertan Mahi̇r Korkmaz
Turkish Journal of Biology
Oylum Höyük falls within the borders of the province of Kilis, located in the southern part of Turkey. It is an important Bronze Age settlement dating back to 5500 BC. In this study, the sex of 36 individuals found in Oylum Höyük was examined using morphological and genetic methods. In the morphological method, sex was identified in 14 female and 13 male individuals. The remaining 8 individuals could not be identified due to the poor preservation of their skeletal remains. Genetic sex was determined with the amplification of sex-specific X, Y centromeric alphoid repeats and ZFX-ZYF gene regions of DNA, …
Detection Of Prokaryotic Microbial Communities Of Çamaltı Saltern, Turkey, By Fluorescein In Situ Hybridization And Real-Time Pcr, Mehmet Burçi̇n Mutlu, Kiymet Güven
Detection Of Prokaryotic Microbial Communities Of Çamaltı Saltern, Turkey, By Fluorescein In Situ Hybridization And Real-Time Pcr, Mehmet Burçi̇n Mutlu, Kiymet Güven
Turkish Journal of Biology
Knowledge of the functions, interactions, and diversity of extremely halophilic microorganisms mostly comes from the results of studies performed in different salterns throughout the world. As model habitats, salterns allow the comparison of different techniques used for qualitative and quantitative analysis of halophilic communities in these hypersaline environments. Çamaltı Saltern is the biggest coastal solar saltern located on the Aegean coast of Turkey, and it produces most of the salt consumed in the country. In the present study, detection of prokaryotic communities of the Çamaltı Saltern was performed using 2 culture-independent methods. Real-time polymerase chain reaction (RT-PCR) and fluorescein in …
Production Of A Novel Bifunctional Catalase-Phenol Oxidase Of Scytalidium Thermophilum In The Presence Of Phenolic Compounds, Yonca Yüzügüllü, Zümrüt Begüm Ögel, Ufuk Bölükbaşi, Nursen Çoruh, Gürkan Karakaş
Production Of A Novel Bifunctional Catalase-Phenol Oxidase Of Scytalidium Thermophilum In The Presence Of Phenolic Compounds, Yonca Yüzügüllü, Zümrüt Begüm Ögel, Ufuk Bölükbaşi, Nursen Çoruh, Gürkan Karakaş
Turkish Journal of Biology
A novel bifunctional catalase with additional phenol oxidase activity (CATPO) is produced by the thermophilic fungus, Scytalidium thermophilum, in a growth-associated manner. In order to study the biological significance of this dual enzyme in relation to phenolic compounds, 14 phenolics were tested for their effect on growth and CATPO production. It was determined that some phenolics exerted a negative effect on growth (catechol, coumaric acid, hydroquinone, kaempferol, myricetin), while others either did not influence growth in a negative manner or enhanced growth by a maximum of 50% increase in biomass (caffeic acid, chlorogenic acid, catechin, gallic acid, resorcinol, vanillic acid). …
External Morphology Of European Seabass (Dicentrarchus Labrax) Related To Sexual Dimorphism, Deni̇z Çoban, Şükrü Yildirim, H. Okan Kamaci, Cüneyt Suzer, Şahi̇n Saka, Kürşat Firat
External Morphology Of European Seabass (Dicentrarchus Labrax) Related To Sexual Dimorphism, Deni̇z Çoban, Şükrü Yildirim, H. Okan Kamaci, Cüneyt Suzer, Şahi̇n Saka, Kürşat Firat
Turkish Journal of Zoology
The relationships among 15 morphometric measurements in 219 aliquots of European seabass (Dicentrarchus labrax) were examined with respect to sexual dimorphism. The ratio of females to males was determined as 1:5.1 and gonadosomatic indices (%) were found for males (2.13 ± 0.86) and females (3.63 ± 1.18). There were 4 morphometric characteristics that differed between genders: ventral margin of cleithrum (VMC), postanal fin length (post-AFL), postdorsal fin length (post-DFL), and preanal fin length (pre-AFL). Although there were significant differences between morphometric characteristics (post-AFL, post-DFL, pre-AFL) and total length, no significant differences were found in the VMC. These average ratios were …
Ecology And Biology Of Scorpions In Palmyra, Syria, Adwan Hussien Shehab, Zuhair Sami Amr, Jeremy Arthur Lindsell
Ecology And Biology Of Scorpions In Palmyra, Syria, Adwan Hussien Shehab, Zuhair Sami Amr, Jeremy Arthur Lindsell
Turkish Journal of Zoology
Near Palmyra, in the Syrian Desert, 5 species of scorpions belonging to 2 families (Buthidae and Scorpionidae) were observed; Buthacus tadmorensis, Androctonus crassicauda, Leiurus quinquestriatus, Orthochirus scrobiculosus, and Scorpio maurus palmatus. B. tadmorensis accounted for 80.6% of the total number of recovered or observed scorpions, while O. scrobiculosus was the least common (1.4%). Pitfall traps proved to be more efficient at sampling (304 individuals) than checking under stones (57 individuals). Pitfall trapping results showed that scorpion abundance differed significantly between the 3 survey areas, while their abundance showed no significant difference among the 3 areas when employing the under-stone method. …
A Study On Influence Of Borax To Polyester Insulators, Aysel Ersoy, Ayten Kuntman
A Study On Influence Of Borax To Polyester Insulators, Aysel Ersoy, Ayten Kuntman
Turkish Journal of Electrical Engineering and Computer Sciences
In this study the effect of borax on polyester insulators is investigated by evaluating the tracking and erosion resistance using the inclined plane test. The test procedure follows the ASTM D2303 standard. During the test, 50 Hz current was acquired from the ground electrode allowing a sampling rate of 48000 samples per second. The effect of borax concentration on the glass transition and the degradation temperature is studied by employing differential scanning calorimetry (DSC) analysis. The addition of borax to the unsaturated polyester resulted in an increase in the glass transition temperature, while the addition of 0.5% of borax by …
Design Of Cdba-Based Active Polyphase Filter For Low-If Receiver Applications, Mehmet Sağbaş
Design Of Cdba-Based Active Polyphase Filter For Low-If Receiver Applications, Mehmet Sağbaş
Turkish Journal of Electrical Engineering and Computer Sciences
A novel first-order active-RC polyphase filter section, using current differencing buffered amplifiers (CDBAs), is presented. The section uses 6 resistors, 2 capacitors, and 2 CDBAs. The transfer function of the proposed section has a single pole and optionally a single zero. Increasing the number of cascading sections, any higher order polyphase filter can be realized. This paper also introduces the leakage caused by element deviation and the effects of the amplifier in nonideal cases. Furthermore, nonideal performances of the proposed filter section are tested with PSpice simulations.