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Articles 1 - 30 of 33
Full-Text Articles in Biology
Extremely Halophilic Bacterial Communities In Şereflikoçhisar Salt Lake In Turkey, Meral Bi̇rbi̇r, Cenk Sesal
Extremely Halophilic Bacterial Communities In Şereflikoçhisar Salt Lake In Turkey, Meral Bi̇rbi̇r, Cenk Sesal
Turkish Journal of Biology
Şereflikoçhisar Lake is the largest salt lake in central Turkey. This lake is a major source of solar salt for food, hide and other industries locally. Due to the economic importance of salt obtained from this lake, a microbial survey has been conducted. Six salt and three brine samples were obtained from the lake for physico-chemical and microbiological analyses. Physico-chemical analysis showed that the salts and brines contain sufficient ions and hardness to support extremely halophilic bacteria. The salt collected from the lake contained 10^4-10^6 colony-forming units of extremely halophilic bacteria per gram and brine taken from the lake contained …
Characterization Of Salivaricin B, A Protein Expressed By Lactobacillus Salivarius M7, Osman Çataloluk, Candan G. Gürakan
Characterization Of Salivaricin B, A Protein Expressed By Lactobacillus Salivarius M7, Osman Çataloluk, Candan G. Gürakan
Turkish Journal of Biology
Salivaricin B (SalB) is a protein encoded by Lactobacillus salivarius M7. This protein is insensitive to proteolytic enzymes, such as pepsin, trypsin, and chymotrypsin, but is partially sensitive to proteinase K. SalB is also stable and maintains its activity over a range of pHs, from 3 to 9. SalB was found to be effective against many closely related lactic acid bacteria such as, L. fermentum, L. plantarum, L. acidophilus and distantly related gram-positive bacteria, including Listeria monocytogenes, Streptococcus faecalis, Staphylococcus aureus and Staph. epidermidis. The mode of action of SalB was obviously bactericidal, and death occurs without bacterial lysis. The …
Antimicrobial Activities Of Various Medicinal And Commercial Plant Extracts, D. Ayfer Ateş, Özlem Turgay
Antimicrobial Activities Of Various Medicinal And Commercial Plant Extracts, D. Ayfer Ateş, Özlem Turgay
Turkish Journal of Biology
The antibacterial activities of the alcohol, ethyl acetate, acetone and chloroform extracts of 5 plant species were studied. The extracts of Pimpinella anisum (L.) (anise, aniseed) (seed), Coriandrum sativum (L.) (coriander, cilantro) (seed), Glycyrrhiza glabra (L.) (liquorice) (root), Cinnamomum cassia Blume (cassia bark, Chinese cinnamon) (bark), and Juniperus oxycedrus (L.) (juniper) (seed) were tested in vitro against 13 bacterial species and strains by the agar diffusion method. Bacillus brevis FMC 3, Bacillus cereus EU, Bacillus megaterium DSM 32, Bacillus subtilis IMG 22, Bacillus subtilis var. niger ATCC 10, Enterococcus faecalis, Klebsiella pneumoniae FMC 5, Listeria monocytogenes SCOTT A, Micrococcus luteus …
Investigation Of The Antimicrobial Activity Of Some Streptomyces Isolates, Nuretti̇n Şahi̇n, Aysel Uğur
Investigation Of The Antimicrobial Activity Of Some Streptomyces Isolates, Nuretti̇n Şahi̇n, Aysel Uğur
Turkish Journal of Biology
Seventy-four different Streptomyces isolates were obtained from the soils of Muğla province. Antimicrobial activity was determined in 45.9% of the isolates. Fifteen isolates showed strong activity against coagulase-negative Staphylococcus (CoNS). These isolates were extensively studied for their in vitro antimicrobial activity against Gram-positive and Gram-negative bacteria and yeasts. The results indicated that five isolates were highly active against CoNS and yeast with an inhibition zone at ? 20 mm. Three of these isolates were identified as Streptomyces antibioticus (MU106, MU107) and S. rimosus (MU114). The UV spectra of the culture extracts for the active isolates showed absorbance peaks ranging between …
Determination Of Poly-\Beta-Hydroxybutyrate (Phb) Production By Some Mesophilic And Thermophilic Lactic Acid Bacteria, Zehra Nur Yüksekdağ, Yavuz Beyatli, Belma Aslim
Determination Of Poly-\Beta-Hydroxybutyrate (Phb) Production By Some Mesophilic And Thermophilic Lactic Acid Bacteria, Zehra Nur Yüksekdağ, Yavuz Beyatli, Belma Aslim
Turkish Journal of Biology
Accumulated poly-\beta-hydroxybutyrate (PHB) was determined in lactic acid bacteria belonging to the genera Lactobacillus, Lactococcus and Streptococcus. Lactobacilli were grown in MRS broth and the others were grown in Elliker broth medium. Cell biomass was obtained by centrifugation. The cell walls were lysed with sodium hypochlorite. Poly-\beta-hydroxybutyrate was extracted using chloroform in a Soxhlet system. Then it was converted to crotonic acid using sulfuric acid and the amount of crotonic acid was measured spectrophotometrically. The yield of poly-\beta-hydroxybutyrate % of cell dry weight of Lactobacillus species was 0.52-25.55%. The values for Lactococcus and Streptococcus species were 0.61-14.81 and 1.20-13.69%, respectively. …
Classification Of Strains Of Bacillus Sphaericus By Different Statistical Methods, Nazi̇me Mercan, Atalay Çağlar, Belma Aslim, Yavuz Beyatli
Classification Of Strains Of Bacillus Sphaericus By Different Statistical Methods, Nazi̇me Mercan, Atalay Çağlar, Belma Aslim, Yavuz Beyatli
Turkish Journal of Biology
In this study, the sensitivies of 21 strains of Bacillus sphaericus to 20 different antibiotics were determined with the antibiotic disc susceptibility test. By measuring the diameters of the inhibition zones in terms of millimetres, the obtained values were analysed using the SPSS for Windows package and classifications were made. With these analyses, 21 strains were clustered into 5 groups. In our study, strains IAB 59 and 2297 were placed into a separate class. In addition, those antibiotics which caused a differentation in strains and a discrimination of strains according to the level of antibiotic effect were determined.
Analysis Of The Effects Of Transcription Factors Gcr2p And Sgc1p On The Control Of The Suc2 Gene Expression In Saccharomyces Cerevisiae, Sezai̇ Türkel, Tülay Turgut, İpek Savaşçioğlu
Analysis Of The Effects Of Transcription Factors Gcr2p And Sgc1p On The Control Of The Suc2 Gene Expression In Saccharomyces Cerevisiae, Sezai̇ Türkel, Tülay Turgut, İpek Savaşçioğlu
Turkish Journal of Biology
The transcription of the SUC2 gene is regulated by glucose repression and the derepression mechanism in the yeast Saccharomyces cerevisiae. The Mig1p-Tup1p-Ssn6p repressor complex, hexokinase PII and nucleosomes are required for the repression of the SUC2 gene. The Snf/Swi and SAGA complexes act on Mig1p and nucleosomes in low glucose media. SUC2 transcription thus becomes activated. In this study, it is shown that the transcription factors Gcr2p and Sgc1p are also required for the high level transcription of the SUC2 gene. SUC2 transcription and the invertase synthesis decreased at significant levels in gcr2 and sgc1 mutant yeast cells. In addition, …
Entomopathogenic Nematodes (Steinernematidae And Heterorhabditidae) For Biological Control Of Soil Pests, Selçuk Hazir, Harry K. Kaya, S. Patricia Stock, Nevi̇n Keski̇n
Entomopathogenic Nematodes (Steinernematidae And Heterorhabditidae) For Biological Control Of Soil Pests, Selçuk Hazir, Harry K. Kaya, S. Patricia Stock, Nevi̇n Keski̇n
Turkish Journal of Biology
Several species of entomopathogenic nematodes in the families Steinernematidae (Steinernema) and Heterorhabditidae (Heterorhabditis) are being produced commercially and used as biological control agents against many soil insect pests and insects in cryptic habitats in many parts of the world. These nematodes, which are mutualistically associated with bacteria (Steinernema with Xenorhabdus bacteria and Heterorhabditis with Photorhabdus bacteria), offer a number of advantages because they have a broad host range, kill their hosts within 48 h, can be easily produced in vivo and in vitro, can be applied with standard spray equipment, are safe to humans and other non-target organisms, have no …
Melatonin Implants Have No Effect On The Testis Volume And Body Weight In Mongolian Gerbils, Alper Karakaş, Bülent Gündüz
Melatonin Implants Have No Effect On The Testis Volume And Body Weight In Mongolian Gerbils, Alper Karakaş, Bülent Gündüz
Turkish Journal of Biology
Photoperiod is an important environmental cue in the regulation of reproductive activity in Mongolian gerbils. Photoperiodic information is ultimately transduced into a hormonal signal by the pineal gland. We examined the effect of constant-release melatonin capsules on the testicular size and body weights of male Mongolian gerbils exposed to a long (14L: 10D) photoperiod. Three groups were formed: control (n = 10), intact + melatonin implant (n = 10) and pinealectomy + melatonin implant (n = 10). The testes and body weights of the gerbils were recorded every week for 8 weeks. Body weights (76 ± 2.0 g intact + …
Failure Of Regeneration Of Sensory Nerve Fibers Following Neonatal Denervation And Crush Lesion In Rats, Jumah Shakhanbeh, Khaled Khleifat
Failure Of Regeneration Of Sensory Nerve Fibers Following Neonatal Denervation And Crush Lesion In Rats, Jumah Shakhanbeh, Khaled Khleifat
Turkish Journal of Biology
The effects of chronic neonatal denervation and a crush lesion on the regenerative capacity of sensory nerve fibers were studied in rats. After 50 weeks of postnatal denervation, the amplitudes of compound action potentials (CAPs) of A\alpha\beta-, A\delta- and C-fibers were reduced to 14.3%, 18.2% and 37.4%, respectively (P < 0.005). Similarly, after a crush lesion, the amplitudes of CAPs were reduced to 34.3%, 38.8% and 51.6%, respectively (P < 0.005). The conduction velocities, thresholds and maximum strength of stimulation of nerve fibers were normal. Neurogenic plasma extravasation into the skin due to antidromic nerve stimulation was reduced to 27.5% and 30.3% after postnatal denervation and the crush lesion, respectively (P < 0.005). These results indicate that neonatal sensory nerve injury induces permanent neurodegeneration of peripheral sensory nerve fibers as demonstrated by the inhibition of afferent conduction property and efferent neurogenic plasma extravasation response.
Electrofusion Of Saccharomyces Cerevisiae Auxotrophic Mutants Of Identical Mating Type Using A Laboratory-Made System, Gökhan Coral, Ömer Çolak, M. Ni̇sa Ünaldi, Burhan Arikan
Electrofusion Of Saccharomyces Cerevisiae Auxotrophic Mutants Of Identical Mating Type Using A Laboratory-Made System, Gökhan Coral, Ömer Çolak, M. Ni̇sa Ünaldi, Burhan Arikan
Turkish Journal of Biology
Yeast protoplasts from haploid auxotroph strains DC6 (MAT\alpha) and FY73 (MAT\alpha) were exposed to an inhomogeneous alternating field (AC 200 V/cm). Due to the dielectrophoretic aggregation two or more cells with close membrane contact were formed between the two electrodes. The effects of different DC pulses were investigated to determine critical fusogenic pulse strength. In the results, the maximum fusant cells were obtained only when 8 kV field strengths were applied. These findings showed that the optimum fusogenic pulse strength for yeast protoplasts is 8 kV/cm under our experimental conditions. After fusion, the DNA contents of both hybrid and individual …
Biosorption Of Copper Ions By Caustic Treated Waste Baker's Yeast Biomass, Yekta Göksungur, Si̇bel Üren, Ulgar Güvenç
Biosorption Of Copper Ions By Caustic Treated Waste Baker's Yeast Biomass, Yekta Göksungur, Si̇bel Üren, Ulgar Güvenç
Turkish Journal of Biology
Waste baker's yeast (Saccharomyces cerevisiae) was used as a biosorbent for Cu^{+2} biosorption. The yeast cells were treated with caustic soda, ethanol and heat to increase their biosorption capacity. Among the treatment methods used, the highest copper uptake (21.1 mg g^{-1}) was obtained with the caustic treatment of baker's yeast. The effect of initial copper concentration and pH on biosorption for caustic treated yeast was studied. The highest Cu^{+2} uptake (120.7 mg g^{-1}) was obtained at pH 4.0, for 198.2 mg I^{-1} initial copper ion concentration. The Langmuir model and Freundlich equation were applied to the experimental data and the …
Acid Adaptation Protects Salmonella Typhimurium From Environmental Stresses, Hali̇l Tosun, Şahi̇ka Aktuğ Gönül
Acid Adaptation Protects Salmonella Typhimurium From Environmental Stresses, Hali̇l Tosun, Şahi̇ka Aktuğ Gönül
Turkish Journal of Biology
Salmonella typhimurium can encounter a wide variety of environments during its life cycle. S. typhimurium can experience and survive dramatic acid stress. However, in vitro the organism is very sensitive to acid. S. typhimurium was adapted to acid by exposure to HCl at pH 5.8 ± 0.1 for one growth cycle. Acid-adapted cells were much better protected from acid death than control cells. The relationship between acid adaptation of S. typhimurium and tolerance to other environmental stresses was also examined. Acid-adapted cells were found to have increased tolerance to various stresses including heat, salt and organic acids. No cross-protection was …
Cytogenetic Effects Of Copper Chloride On The Root Tip Cells Of Helianthus Annuus L., Hüseyi̇n İnceer, Sema Ayaz, Osman Beyazoğlu, Emi̇ne Şentürk
Cytogenetic Effects Of Copper Chloride On The Root Tip Cells Of Helianthus Annuus L., Hüseyi̇n İnceer, Sema Ayaz, Osman Beyazoğlu, Emi̇ne Şentürk
Turkish Journal of Biology
The cytogenetic effects of copper chloride on root tip cells of Helianthus annuus were investigated. Seeds were treated with 10, 25, 50 and 100 mg/L (ppm) of copper chloride for 24 h. It was found that copper chloride has a marked mitodepressive action on mitosis. Mitotic abnormalities were increased and the mitotic index was decreased depending on the concentration of the copper chloride applied.
Protein And Dna In Systematic Biology, Selma Gülbi̇tti̇ Onarici, Si̇bel Sümer
Protein And Dna In Systematic Biology, Selma Gülbi̇tti̇ Onarici, Si̇bel Sümer
Turkish Journal of Biology
Since the 1960s, biological macromolecules have occupied an increasingly important role in evolutionary and systematic studies. These biological macromolecules, used as sources of molecular characteristics, are proteins and various types of DNA such as a nuclear genome, nuclear ribosomal DNA, mitochondrial genome, and chloroplast genome. Electrophoresis and immunological techniques are used for generating systematic data from proteins. Generally, electrophoretic methods focus on two general forms of protein data, isozymes and allozymes, while the basis of immunological studies is antigen-antibody reactions. Basic methodologies for using DNA for systematic purposes include DNA-DNA hybridizations, restriction enzyme analysis, sequencing, cloning, PCR and PCR-based fingerprinting …
Reproductive Response Of Adult Siberian Hamsters To One-Hour Melatonin Infusions, Bülent Gündüz, Milton H. Stetson
Reproductive Response Of Adult Siberian Hamsters To One-Hour Melatonin Infusions, Bülent Gündüz, Milton H. Stetson
Turkish Journal of Biology
The pineal hormone melatonin is known to play an important role in mediating photoperiodic messages to the reproductive system in seasonal breeding animals. In this study, we investigated whether a 1 h subcutaneous infusion of 50 ng of melatonin at 2000-2100 hours, effective in causing inhibition of testicular development in the juvenile Siberian hamsters (Phodopus sungorus), would cause testicular regression in adults of this species housed on a long photoperiod (LD16:8). Pinealectomized adult hamsters received programmed subcutaneous infusions of 50 or 500 ng of melatonin or vehicle (0.12 ml) at 2000-2100 hours each day for 8 weeks. We found that …
Neuroepithelial Endocrine Cells In The Lung Of Rana Ridibunda: An Immunohistochemical Study, Füsun Öztay, Ayşe Tabakoğlu Oğuz
Neuroepithelial Endocrine Cells In The Lung Of Rana Ridibunda: An Immunohistochemical Study, Füsun Öztay, Ayşe Tabakoğlu Oğuz
Turkish Journal of Biology
In this study, neuroepithelial endocrine cells were for the first time identified in the lung of Rana ridibunda. The presence of these cells was investigated using endocrine markers by the immunohistochemical method at the light microscopic level. Immunoreactive - cells containing serotonin, calcitonin, met-enkephalin and leu-enkephalin were observed alone or in clusters within the respiratory epithelium. In general, clustered - cells containing serotonin were detected among the ciliated cells and goblet cells of the pseudostratified epithelium on apical dilation of the primary septa where the inhaled - air is first met. Among pneumocytes, single and clustered neuroepithelial endocrine cells display …
Phospholipid And Triacylglycerol Fatty Acid Compositions From Various Development Stages Of Melanogryllus Desertus Pall. (Orthoptera: Gryllidae), Kadri̇ Bozkuş
Turkish Journal of Biology
Phospholipid and triacylglycerol fatty acid compositions from eggs; seventh, eighth and last nymphal stages; and 1, 20- and 40-day-old adult females of the black cricket, Melanogryllus desertus, grown in stock-culture medium under laboratory conditions were analyzed by gas chromatographic methods. A large amount of the fatty acid components at all the development stages of the insects analyzed comprised oleic, linoleic, palmitic and stearic acids. However, palmitoleic, myristic and linolenic acids were also found, at lower levels. There were fluctuations in fatty acid levels at different development stages, such as nymphs and adults. Oleic acid was lower in 1-day-old and older …
Quorum Sensing In Gram-Negative Bacteria, Gülgün Boşgelmez Tinaz
Quorum Sensing In Gram-Negative Bacteria, Gülgün Boşgelmez Tinaz
Turkish Journal of Biology
It has become increasingly and widely recognised that bacteria do not live as isolated entities but instead exist as communities that exploit elaborate systems of intercellular communication to facilitate their adaptation to changing environmental conditions. A well-characterised example of such intercellular communication is quorum sensing. Quorum sensing depends on the production of diffusible signal molecules termed autoinducers or pheromones, which enable a bacterium to monitor its own cell population density. A variety of physiological processes in a range of bacterial species is regulated by quorum sensing. Examples include bioluminescence, antibiotic biosynthesis, swarming, biofilm differentiation, conjugation and the production of virulence …
In Vivo And In Vitro Micrografting Of Pistachio, Pistacia Vera L. Cv. "Siirt", Ahmet Onay, Vedat Pi̇ri̇nç, Fi̇li̇z Adiyaman, Çi̇ğdem Işikalan, Engi̇n Ti̇lkat, Davut Başaran
In Vivo And In Vitro Micrografting Of Pistachio, Pistacia Vera L. Cv. "Siirt", Ahmet Onay, Vedat Pi̇ri̇nç, Fi̇li̇z Adiyaman, Çi̇ğdem Işikalan, Engi̇n Ti̇lkat, Davut Başaran
Turkish Journal of Biology
In this study, the success of in vivo and in vitro micrografts of pistachio (Pistacia vera L. cv. "Siirt") materials are presented. The only variable tested was age (1, 5, 10, and 30-year-old trees). Ten- to 12-day-old axenic seedlings germinated in vitro or seedlings (3 to 5 months-old) grown in pots in vivo were used as rootstocks. Shoot tips collected from the four age classes of mature trees of pistachio were the source of scions. Firm contact between the scion and rootstock was assured through the use of parafilm tape at the graft junction for in vivo micrografts. The in …
Adventitious Shoot Organogenesis And Plant Regeneration From Cotyledons Of Diploid Diyarbakır Watermelon (Citrullus Lanatus Cv. "Sürme"), Vedat Pi̇ri̇nç, Ahmet Onay, Fi̇li̇z Adiyaman, Çi̇ğdem Işikalan, Engi̇n Ti̇lkat, Davut Başaran
Adventitious Shoot Organogenesis And Plant Regeneration From Cotyledons Of Diploid Diyarbakır Watermelon (Citrullus Lanatus Cv. "Sürme"), Vedat Pi̇ri̇nç, Ahmet Onay, Fi̇li̇z Adiyaman, Çi̇ğdem Işikalan, Engi̇n Ti̇lkat, Davut Başaran
Turkish Journal of Biology
Adventitious shoots were obtained from the diploid Diyarbakır watermelon cultivar "Sürme" by culturing cotyledons on shoot regeneration medium for 3 weeks. The effects of two cytokinins, benzyl amino purine (BA) and kinetine (Kin), on shoot organogenesis were examined. The number of shoots per explant were approximately more than 50% higher when 0.5 mg/l BA was used compared to the most effective kinetin concentration (1 mg/l). Plants were obtained by transferring 1 to 2 cm shoots to MS medium supplemented with 1-4 mg/l naphthalene acetic acid. Most of the regenerated plants (more than 50%) were successfully transplanted to the field. This …
Epipelic And Epilithic Algae Of Lower Parts Of Yanbolu River (Trabzon, Turkey), Bülent Şahi̇n
Epipelic And Epilithic Algae Of Lower Parts Of Yanbolu River (Trabzon, Turkey), Bülent Şahi̇n
Turkish Journal of Biology
The algae of Yanbolu River were investigated in samples collected from different habitats (epipelic, epilithic) at two stations between October 2000 and September 2001. The flora consisted of 78 taxa belonging to the Bacillariophyta (47 taxa), Cyanophyta (16 taxa), Chlorophyta (14 taxa) and Euglenophyta (1 taxon). The Bacillariophyta was the dominant form of algal flora. Amphora ovalis var. pediculus, Ceratoneis arcus, Cymbella affinis, C. minuta, Didymosphenia geminata, Melosira varians and Synedra ulna were the most frequent taxa in the algal flora. While the maximum density of the epipelic community was 29,555 cells/cm*2 at station I in June, it was 27,756 …
Investigation Of The Microfungal Flora Of The Bird Paradise National Park In Bandırma, Balıkesir (Turkey), Ayşe Di̇lek Azaz
Investigation Of The Microfungal Flora Of The Bird Paradise National Park In Bandırma, Balıkesir (Turkey), Ayşe Di̇lek Azaz
Turkish Journal of Biology
Fifteen soil samples taken from the Bird Paradise National Park in Bandırma were investigated using the soil dilution plate and soil washing methods. Thirty-three species and four different sterile microfungal taxa were identified. Twenty-eight of these species belonged to the Hyphomycetes and 5 to the Mucorales. The genus with the highest species diversity found in the study area was Penicillium, represented by 16 species. Some chemical properties of the soil samples were also established. Quantitative analysis based on the soil dilution plate method revealed a statistically significant difference between soil samples subjected to the rising water level of the lake …
The Development Of A Modified Method For Isolating Plasmids From Exopolysaccharide Producing Lactobacillus Species Using Conventional Plasmid Isolation Methods, Osman Çataloluk
Turkish Journal of Biology
Lactic acid bacteria (LAB) are a key element in the dairy industry. The gene products encoded by the plasmids of LAB carry out fermentation. To date, many successful plasmid isolation studies have been conducted with Escherichia coli, Staphilococcus, Streptococcus, Salmonella, Listeria and many strains of LAB. However, since LAB comprise a conglomerate of seven different genera, each with its own physiological and morphological characteristics, and produce a large amount of exopolysaccharide coat, it is extremely difficult to obtain plasmids by conventional methods. A field isolate of lactobacillus known as Lactobacillus salivarius M7 was utilized to obtain plasmids by all known …
Modification By Compositional Antimutagens Of The Key Stages Of A Mutation Process, Urkhan Alekperov, Ali Aliev, Afet Rustamova, Saida Jafarova
Modification By Compositional Antimutagens Of The Key Stages Of A Mutation Process, Urkhan Alekperov, Ali Aliev, Afet Rustamova, Saida Jafarova
Turkish Journal of Biology
In experiments with Escherichia coli B/r WP2(trpE-), mice marrow cells and human lymphocytes the antimutagenic activity of an extract from Zizyphus mill was performed. The extract was tested separately and in mixture with Triticum aestivum. In experiments with different treatment schemes it has been established that the extract from wheat sprouts added to an antimutagenic preparation from Zizyphus mill intensifies the genoprotective properties of the Zizyphus mill extract.
The Effects Of Dietary Fatty Acids On The Fatty Acid Composition In The Phospholipid Fraction Of Gambusia Affinis, Eli̇f İpek Cengi̇z, Erhan Ünlü, Mehmet Başhan
The Effects Of Dietary Fatty Acids On The Fatty Acid Composition In The Phospholipid Fraction Of Gambusia Affinis, Eli̇f İpek Cengi̇z, Erhan Ünlü, Mehmet Başhan
Turkish Journal of Biology
The present study represents an investigation into the effect of dietary fatty acids on the fatty acid composition of the phospholipid fraction of Gambusia affinis, a small freshwater fish living in a source located on the campus of Dicle University. The fatty acid composition of the phospholipid fraction was analysed by gas chromatography for fish collected from the freshwater source, which were naturally fed, and also fish fed an artificial diet with a w6/w3 ratio of 5.5:1 for 30 days. The level of w3 in the fish fed artificially for 30 days was higher than in those collected from the …
Evaluation Of The Reproductive Potential And Competition Between Two Entomopathogenic Nematodes, Steinernema Feltiae Filipjev, 1934 (Rhabditida: Steinernematidae) And Heterorhabditis Bacteriophora, Poinar 1976 (Rhabditida: Heterorhabditidae), Işik Oğuzoğlu Ünlü, Nurdan Özer
Evaluation Of The Reproductive Potential And Competition Between Two Entomopathogenic Nematodes, Steinernema Feltiae Filipjev, 1934 (Rhabditida: Steinernematidae) And Heterorhabditis Bacteriophora, Poinar 1976 (Rhabditida: Heterorhabditidae), Işik Oğuzoğlu Ünlü, Nurdan Özer
Turkish Journal of Biology
The emergence in Galleria mellonella (L.) larva, which was infected by Steinernema feltiae and Heterorhabditis bacteriophora, began on the ninth day after exposure to the former nematode and the sixth day of exposure to the latter nematode (25 ± 0.5 ºC). The average number of nematodes developing in each host was as 13,829, and the range was from 4365 to 27,510 for S. feltiae infection. The average number of nematodes per host was 141,562, and the range was 50,905 - 271,593 for H. bacteriophora infection. When the 2 different species were inoculated simultaneously into the same host, H. bacteriophora caused …
The Effect Of Tannery Effluent On The Colonization Rate Of Plankters: A Microcosm Study, Yalavarthi Naga Koteswari, Ravichandran Ramanibai
The Effect Of Tannery Effluent On The Colonization Rate Of Plankters: A Microcosm Study, Yalavarthi Naga Koteswari, Ravichandran Ramanibai
Turkish Journal of Biology
The present study describes a multispecies toxicity test that uses community level responses of plankton samples from a natural lake using polyurythane foam (PF) as artificial substrate. These substrates were suspended and left for a period of 14 days. Colonized substrates were then placed in a series of microcosms dosed with a gradient of tannery effluent from 1 to 15% concentration. The species composition and abundance of the planktonic communities in PF substrate with the exposure of 4 different concentration of tannery effluent (1%, 3%, 5% and 15%) were assessed on days 1, 3, 7, 14, 21 and 28. Species …
Host Finding Behavior Of Two Different Turkish Isolates Of Entomopathogenic Nematode Species, Heterorhabditis Bacteriophora, Poinar 1976 (Rhabditida: Heterorhabditidae), İ. Alper Susurluk, Işik O. Ünlü, İlker Kepenekci̇
Host Finding Behavior Of Two Different Turkish Isolates Of Entomopathogenic Nematode Species, Heterorhabditis Bacteriophora, Poinar 1976 (Rhabditida: Heterorhabditidae), İ. Alper Susurluk, Işik O. Ünlü, İlker Kepenekci̇
Turkish Journal of Biology
The movement of 2 different isolates of an insect parasitic nematode species (Heterorhabditis bacteriophora Tur-H2 and H. bacteriophora Tur-H1) in vertical columns was tested under laboratory conditions. We have found significant differences in the movements of H. bacteriophora Tur-H2 and H. bacteriophora Tur-H1 towards the Galleria mellonella larvae as a host. The maximum nematode infection rate inside the host was observed on the third day of the trial period for both species. We have recorded the number and the given percentage of infective juveniles (IJs) of H. bacteriophora Tur-H2 that moved towards the G. mellonella larvae within 24, 48, 72, …
The Analysis Of Partial Dominance Of Intragenic Mutations At The Adh Locus In Drosophila Melanogaster At Two Different Alcohol Concentrations, Vatan Taşkin
Turkish Journal of Biology
The dominance of a de novo mutation determines its effect on the viability of the first and succeeding generations; therefore, it is a major factor in estimating the risk from mutations to human health. It is well established that large deletions lead to significant dominance, but until the recent development of molecular methods for amplification and sequencing of mutations it was not possible to determine the dominance of specific intragenic changes in DNA. The purpose of this study was to determine the dominance for a series of Adh-null mutations, each with a minimum mutation of a transition at one base …