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Articles 1561 - 1590 of 1681
Full-Text Articles in Biology
Distribution Of The Bacteria Involved In The Nitrogen And Sulfur Cycle In İzmir Bay, Fatma Güngör, Füsun Uçar
Distribution Of The Bacteria Involved In The Nitrogen And Sulfur Cycle In İzmir Bay, Fatma Güngör, Füsun Uçar
Turkish Journal of Biology
Qualitative seasonal distributions of sulfate-reducing bacteria, colorless sulfur bacteria, nitrifying and denitrifying bacteria in the water and sediment samples in the inner part of İzmir Bay were investigated in relation to certain physico-chemical parameters (pH, oxygen, hydrogen sulfide, nitrate, nitrite, ammonium). Denitrifying bacteria and sulfate-reducing bacteria were present in the sediment and even in the aerobic water samples. Hydrogen sulfide was found almost in all water samples measured but it was at lower concentrations. It is suggested that denitrifying bacteria and sulfate reducing bacteria which produce hydrogen sulfide are involved in the mineralization of organic matter. Members of Thiobacillus and …
In Vitro Propagation Of Thymus Sipyleus Boiss. (Lamiaceae), Bengi̇ Baba Erdağ, A. Kami̇l Yürekli̇
In Vitro Propagation Of Thymus Sipyleus Boiss. (Lamiaceae), Bengi̇ Baba Erdağ, A. Kami̇l Yürekli̇
Turkish Journal of Biology
In vitro propagation of Thymus sipyleus Boiss. (Lamiaceae), an endemic from western Anatolia was investigated. Sterilized seeds of the plant were germinated on modified Murashige-Skoog medium (mMS) and Heller's nutrient media. Then, seedlings were transferred to Murashige-Skoog basal medium containing 0.4 mg/l Naphtaleneacetic acid, (NAA) and 3 mg/l Benzyladenin (BA) and then they formed callus where they were in contact with the medium. Plantlets which regenerated on the same medium formed multiple shoots within 2 weeks and they were rooted after the 4th subculture.
The Feeding Of Brachionus Plicatilis (Rotifera) With Different Microalgae Species, Isochrysis Galbana Parke, Tetraselmis Chuii (Bucker), Rhinomonas Reticulata (Lucas) Novamizo, Pavlova Lutheri (Droop) Green And Chlorella Vulgaris Beijerinck, Seli̇n Sayin, Oya Işik, Sevi̇m Polat
The Feeding Of Brachionus Plicatilis (Rotifera) With Different Microalgae Species, Isochrysis Galbana Parke, Tetraselmis Chuii (Bucker), Rhinomonas Reticulata (Lucas) Novamizo, Pavlova Lutheri (Droop) Green And Chlorella Vulgaris Beijerinck, Seli̇n Sayin, Oya Işik, Sevi̇m Polat
Turkish Journal of Biology
In this study, the feeding of Brachionus plicatilis with different single cell microalgae species, Tetraselmis chuii, Isochrysis galbana, Pavlova lutheri, Chlorella vulgaris and Rhinomonas reticulata which are used widely for rotifer culture was investigated. At the first stage of the study, B. plicatilis was fed a mixture of T. chuii, C. vulgaris, I. galbana and R. reticulata the densities of which were 130x104, 650x10^4, 260x10^4 and 130x10^4 cell/ml respectively. The highest ingestion rate, namely 1643 cell/rot./min, was obtained with C. vulgaris. At the second stage, B. plicatilis was fed a the mixture of T. chuii and R. reticulata, of which …
A Quantitative And Qualitative Study On The Benthic Algal Floraof Palandöken Pond, Hasan Gürbüz
A Quantitative And Qualitative Study On The Benthic Algal Floraof Palandöken Pond, Hasan Gürbüz
Turkish Journal of Biology
In this study, the composition and density of the benthic algae and seasonal variations of the benthic algae of Palandöken Pond were determined between September 1990 and September 1992. Samples were collected from two previously selected sampling sites. It was found that Bacillariophyta was the dominant benthic algal group in this pond. During our investigation a total of 160 taxa were identified and 135 them were composed of epipelic algae. The percentages of algal groups were as follows: Bacillariophyta 57%, Cholorphyta 11% and Euglenophyta5%. It was found that there were plenty of epipelic algal species living together with epiphytic and …
Investigation Of Selected Industrially Important Enzymatic Activities Of Turkish Agricultural Mycoflora-I: Amylase, Lipase, Protease, Şemi̇nur Topal, Ceyda Pembeci̇, Mehli̇ka Borcakli, Mehmet Batum, Özlem Çelti̇k
Investigation Of Selected Industrially Important Enzymatic Activities Of Turkish Agricultural Mycoflora-I: Amylase, Lipase, Protease, Şemi̇nur Topal, Ceyda Pembeci̇, Mehli̇ka Borcakli, Mehmet Batum, Özlem Çelti̇k
Turkish Journal of Biology
In this context, fungi being a rich source in from metabolites point of view, their utilization possibilities in various area are investigated. Primary metabolites of the fungi representing Turkish agricultural mycoflora which belongs to our culture collections are determined and their importance with respect to industry will be evaluated. It is assumed that enzymes such as, protease, amylase, lipase, cellulase, xylanase, b-glucanase, pectinase of these moulds represent a potential source for food industry. In this context, qualitative screening three of these enzymes producing abilities of relevant moulds are carried out. Methods used for enzyme determination cover, "Opacity Capacities in Deep …
The Population Structure And Growth Properties Of Chalcalburnusmossulensis (Heckel, 1843) Caught From Askale Region Of River Karasu, Mustafa Türkmen, İhsan Akyurt
The Population Structure And Growth Properties Of Chalcalburnusmossulensis (Heckel, 1843) Caught From Askale Region Of River Karasu, Mustafa Türkmen, İhsan Akyurt
Turkish Journal of Biology
In this study, the population structure and growth properties of Chalcalburnus mossulensis (Heckel, 1843) caught from Askale Region of River Karasu betwen February 1996 and January 1997 were examined. The age composition of population varied between I and VI ages, and the most abundant age group was the third age group (42.13%). The population was composed of 51.74% females and 48.26% males. The fork length and the body weights of males and females varied between 8.9-18.1 cm, 3.6-67.9 g and 8.5-18.5 cm, 5.1-79.5 g respectively. The specific and relative growth for length and weight were maximum in the second age. …
Increase Of The \Alpha-Amylase Yield By Some Bacillusstrains, Eli̇f Sarikaya, Veli̇tti̇n Gürgün
Increase Of The \Alpha-Amylase Yield By Some Bacillusstrains, Eli̇f Sarikaya, Veli̇tti̇n Gürgün
Turkish Journal of Biology
In order to obtain high amounts of \alpha-amylase enzyme from Bacillus bacteria a new medium was developed. In this medium, three strains of Bacillus bacteria were grown in the presence of different carbon, nitrogen and metal ions. The highest \alpha-amylase yield was obtained by addition of Na-citrate, strach and sucrose for the strains of B. subtilis, B. amyloliquefaciens I and B. amyloliquefaciens II, respectively. As a nitrogen source, yeast extract was found to be effective on enzyme yield for B. subtilis and B. amyloliquefaciens II, while ammonium sulfate was found to be effective for B. amyloliquefaciens I. None of the …
Study Of Interphases Betweensubunits Of Human Serum Albumin By Tritiumlabelling Method, Elimchan S. Dzhafarov
Study Of Interphases Betweensubunits Of Human Serum Albumin By Tritiumlabelling Method, Elimchan S. Dzhafarov
Turkish Journal of Biology
For the purpose of obtaining information about interphases between subunits of human serum albumin (HSA), a new tritium labelling method was adopted. The existence of linear dependence between accessible surface of amino acid residues and their specific radio-activity enabled to obtain information about qualitattive and quantitative amino acid composition of surface layer of protein globule and its large fragments. It is shown that the fragments surface characterized by higher accessibility of hydrophobic amino acid residues such as Ala, Val, Leu, Ile, Pro and Phe. Moreover Lys, Asx and Glx demonstrate high accessibility also. It is supposed that the spatial HSA …
Distributions And Possible Roles Of Laminin, Fibronectin And Theirreceptor Subunits Integrin \Beta4 And \Alpha5 In Remodelling Of Extracellularmatrix During Decidualization In Rats, Ümi̇t Ali̇ Kayişli, Mevlüt Asar, Ramazan Demi̇r
Distributions And Possible Roles Of Laminin, Fibronectin And Theirreceptor Subunits Integrin \Beta4 And \Alpha5 In Remodelling Of Extracellularmatrix During Decidualization In Rats, Ümi̇t Ali̇ Kayişli, Mevlüt Asar, Ramazan Demi̇r
Turkish Journal of Biology
In the endometrium preparing for pregnancy, the stromal matrix components of the cells and their products begin structural differentiation due to endometrial receptivity. According to the hypothesis that 'extracellular matrix (ECM) proteins and adhesion molecules take roles in the structural differentiation as a result of endometrial decidualization', our aim was to determine the roles of ECM molecules laminin, fibronectin and adhesion proteins integrin \alpha5 and \beta4 in the decidulization and implantation by examining the emergence and changing distribution of these proteins. In this study, five experimental groups, consisting of 40 pregnant animals on pregnancy days 4-8, were used. Paraffin tissue …
The Effect Of Soy Flour On Alcohol And Cell Concentration In Alcoholfermentation Of Molasses, Tuncay Ari, Sedat Dönmez
The Effect Of Soy Flour On Alcohol And Cell Concentration In Alcoholfermentation Of Molasses, Tuncay Ari, Sedat Dönmez
Turkish Journal of Biology
The effects of soy flour on alcohol fermentation of molasses by different yeast strains were investigated. Six strains of Saccharomyces cerevisiae and one Saccharomyces bayanus were used. It was found that soy flour affected fermentation time, alcohol concentration and total cell count in all strains. But the degree of this effect was different among strains. The maximum ethanol concentration were 63.9 g/l in Saccharomyces cerevisiae N3 strains. The maximum theoritical yield, however was 91.6% in Saccharomyces cerevisiae W4 strains. Compared with the control, the largest increment in ethanol concentration was in Saccharomyces bayanus 1A as 12.2%. Furthermore, addition of soy …
Effects Of Exogenous Spermine On Seed Germination And Early Growthof Sunflower Seeds Under Salinity Stress, Fatma Mutlu, Suna Boncuk
Effects Of Exogenous Spermine On Seed Germination And Early Growthof Sunflower Seeds Under Salinity Stress, Fatma Mutlu, Suna Boncuk
Turkish Journal of Biology
The effects of various concentrations (0.01, 1, 2mM) of spermine (Spm) on germination and some early growth parameters of sunflower ( Helianthus annuus L. cv. Santafe) seeds were investigated in media containing different concentrations of NaCl (50, 100, 200mM). Regardless of its concentrations, application of Spm under non-saline conditions remained ineffective on germination percentage as well as on the early growth parameters studied (length of radicle, fresh and dry weights). The salt, depending on its concentration, inhibited or delayed the germination to a great extent. The growth parameters studied in the early growth period were also adversely affected by salt …
Transmission Of The Embryonic Stem Cell (Esc)Genome To Offspring And Sexual Development Inchimeric Mice From A Male Esc Line, Sezen Arat
Turkish Journal of Biology
This study was performed to determine the capability of embryonic stem (ES) cells at late passage number to form functional germ cells and to orientate the sexual development of chimeric mice produced from ES cell injection into embryos. When an R1 ES cell line was routinely cultured on mitotically inactivated feeder cells in culture medium supplemented with leukemia inhibitory factor (LIF), the colonies maintained an undifferentiated ideal ES cell morphology. When the ES cells were injected into 45 eight-cell embryos, 38 embryos (84%) combined with ES cells. Twenty-eight percent of the embryos transferred to recipients developed to term. Thirty percent …
Germin, An Oxalate Oxidase, Has A Function In Manyaspects Of Plant Life, Mahmut Çalişkan
Germin, An Oxalate Oxidase, Has A Function In Manyaspects Of Plant Life, Mahmut Çalişkan
Turkish Journal of Biology
Germin, a molecular marker of wheat embryo germination, is a remarkably protease-resistant, apoplastic, homopentameric glycoprotein. Different forms of germin found to be related to various aspects of plant development have been discovered. Germins were determined in cereals, dicotyledonous angiosperms, gymnosperms and in a prosit, all these proteins are together called germin-like proteins due to their DNA sequence homology. Cereal germins have oxalate oxidase activity, an activity which generates hydrogen peroxide by degrading oxalic acid. Both of these molecules have been implied in the regulation of cell development, differentiation, signalling and defence systems of plants. The germin-like proteins found in dicotyledonous …
The Effect Of Sulphur Dioxide On Macrophage Phagocytic Activity In Diabetic Rats, Veci̇he Ni̇met İzgüt Uysal, Vural Küçükatay, Aysel Ağar, Pi̇raye Yargiçoğlu
The Effect Of Sulphur Dioxide On Macrophage Phagocytic Activity In Diabetic Rats, Veci̇he Ni̇met İzgüt Uysal, Vural Küçükatay, Aysel Ağar, Pi̇raye Yargiçoğlu
Turkish Journal of Biology
Sulphur dioxide as a criterion of air pollution supresses macrophage functions. Some immunological changes in diabetes mellitus have been detected. In the present study, we examined the effect of sulphur dioxide on macrophage phagocytic activity in diabetic rats. The animals were separated into four groups as: 1) Control, 2) Sulphur dioxide, 3) Diabetes mellitus, 4) Diabetes mellitus+sulphur dioxide. The first and the third groups of animals were respirated with filtered atmosphere air in a special chamber one hour daily for eight weeks, while the other groups were exposed to 10 ppm sulphur dioxide in the same conditions and periods. The …
Physiological Changes In Grapevines Induced By Osmotic Stress Originated From Salt And Their Role In Salt Resistance, Nuray Si̇vri̇tepe
Physiological Changes In Grapevines Induced By Osmotic Stress Originated From Salt And Their Role In Salt Resistance, Nuray Si̇vri̇tepe
Turkish Journal of Biology
Rooted cuttings of Çavuş (salt-resistant), Müşküle (salt-sensitive) and Sultani Çekirdeksiz (moderately salt-sensitive) grapevine cultivars, grown in perlite medium, were subjected to salt stress by irrigating them with 1/2 Hoagland nutrient solution including different NaCl concentrations (0.00, 0.50 and 0.75%). It was determined that stomatal conductance and transpiration were strongly inhibited in Müşküle and Sultani Çekirdeksiz with salt treatments, while these physiological activities were maintained with a controlled decrease in cv. Çavuş. Relative water content of leaves decreased while loss of turgor increased in cv. Müşküle due to the salt treatments. Similar changes were also observed in cv. Sultani Çekirdeksiz although …
Genomic Imprinting: A Specialized Form Of Generegulation, Fatma Fi̇li̇z Çoşkun Ari
Genomic Imprinting: A Specialized Form Of Generegulation, Fatma Fi̇li̇z Çoşkun Ari
Turkish Journal of Biology
Genomic imprinting is a process resulting in the preferential expression of certain genes depending on whether the genetic material has been inherited from the mother or the father. Many imprinted genes have been identified as having important roles in mammalian development, and the loss of imprints as well as non-imprinted alleles causes a variety of developmental abnormalities and pathological conditions in both mice and humans. In this article, the phenomenon of genomic imprinting, the developmental implications of imprinting and the molecular mechanisms proposed for this process are reviewed.
Production Of Monoclonal Antibodies Specific Forprogesterone, Fatma Şahi̇ngöz Yücel, Beyazit Çirakoğlu
Production Of Monoclonal Antibodies Specific Forprogesterone, Fatma Şahi̇ngöz Yücel, Beyazit Çirakoğlu
Turkish Journal of Biology
Progesterone levels in milk and serum are indicators of pregnancy in cattle. The progesterone level reaches a peak on the 21 st and 22 nd days of pregnancy. Monoclonal antibodies specific to progesterone could be used for the immunodetection of milk and serum progesterone levels. We report here the development of hybrid cells prdoducing monoclonal antibodies specific for progesterone using hybridoma technology. Hybridoma cells secreting monoclonal antibodies against progesterone (MAM 2H11, MAM 6G6) were developed by fusion of the spleen cells of an immunized BALB/c mouse with FO (ATCC CRL 1646) mouse myeloma cells. These monoclonal antibodies were characterized for …
Ultrastructural Observations On Connectioncomplexes Between The Mural Trophoblast Cells Ofblastocyst In The Rat, Ramazan Demi̇r, İsmai̇l Üstünel, Necdet Demi̇r
Ultrastructural Observations On Connectioncomplexes Between The Mural Trophoblast Cells Ofblastocyst In The Rat, Ramazan Demi̇r, İsmai̇l Üstünel, Necdet Demi̇r
Turkish Journal of Biology
It is generally accepted that implantation morphologically consists of the establishment of a contact between the blastocyst and the uterine tissues. During this contact and interaction process, many physiological, biochemical and ultrastructural factors are involved. The aim of this study was to describe the ultrastructure of connection complexes between mural trophoblast cells in the blastocystic ring in the rat. Implantation sites obtained from rats on day 5 of pregnancy were studied ultrastructurally. Connected complexes were observed between mural trophoblast cells in different three types: a) dense long line connection; b) desmosome-like sturctures; c) regular suture-like interdigitation resembling parallel railings. According …
The Accumulation And Histological Effects Of Theorganometallic Fungicide Propineb On The Organsof Fetuses And Female Rats During Pregnancy, Kemal Güven, Engi̇n Deveci̇, Davi̇d De Pomerai
The Accumulation And Histological Effects Of Theorganometallic Fungicide Propineb On The Organsof Fetuses And Female Rats During Pregnancy, Kemal Güven, Engi̇n Deveci̇, Davi̇d De Pomerai
Turkish Journal of Biology
Dithiocarbamate propineb is an organometal fungicide, which is widely used for the control of diseases in plants. Female Wistar rats were exposed orally to propineb concentrations of 200 and 400 ppm, from the 6th day of gestation up to birth. At 400 ppm, propineb showed a variety of macroscopic (e.g. ptosis and paralysis) and microscopic symptoms in the organs of both fetuses and female rats. We found that the body weights of both one-day old litters and their propineb-treated mothers were lower than those of the controls. Histological examination of the livers and kidneys of the fetuses and propineb-treated pregnant …
Lack Of Minority Advantage In Drosophilamelanogaster Mutants, Şükran Çakir, Aykut Kence
Lack Of Minority Advantage In Drosophilamelanogaster Mutants, Şükran Çakir, Aykut Kence
Turkish Journal of Biology
The objective of this study was to test the generality of frequency-dependent fitness in the mating behavior of Drosophila, called the minority effect and to investigate the effect of artificial olfactory cues and marking the flies by wing cillipng on the frequency-dependent mate choice. In the mating experiments using wild type (oregon) and mutant (white-eyed, sepia, ebony) strains of Drosophila melanogaster, the mating success of mutant males did not increase as their frequency decreased. In addition, the olfactory cue hypothesis was not supported by the results of the experiments with artificial scent. The results of this study did not support …
Purification And Characterization Of Cysteine-43mutant Citrate Synthase From Thermoplasmaacidophilum, İpek Erduran, Semra Kocabiyik
Purification And Characterization Of Cysteine-43mutant Citrate Synthase From Thermoplasmaacidophilum, İpek Erduran, Semra Kocabiyik
Turkish Journal of Biology
Two cysteine residues were introduced to selected positions (Serine-309 and Serine-43) of the Thermoplasma acidophilum citrate synthase. Serine-309 Cysteine mutation drastically reduced the activity, as well as the thermostabiity of the enzyme. Although Serine-43 Cysteine mutation reduced the enzyme activity, it did not have any effect on the thermostability. Both wild-type and cysteine-43 mutant Thermoplasma citrate synthase enzymes were purified to homogenity using affinity chromatography on Matrex Gel Red A. The cysteine-43 mutant Thermoplasma citrate synthase was strikingy similar to the wild-type recombinant citrate synthase in its molecular size, substrate and co-factor specificities, pH profile and thermal resistance. The decrease …
Determination Of The Presence Of Crpgenes Instaphylococcus Aureus, Staphylococcus Epidermidis,Lactobacillus Delbrueckii Andcorynebacterium Verasuş, Ali̇ Osman Beldüz, Zi̇hni̇ Demi̇rbağ, Sabri̇ye Dülger, Ali̇ Osman Kiliç
Determination Of The Presence Of Crpgenes Instaphylococcus Aureus, Staphylococcus Epidermidis,Lactobacillus Delbrueckii Andcorynebacterium Verasuş, Ali̇ Osman Beldüz, Zi̇hni̇ Demi̇rbağ, Sabri̇ye Dülger, Ali̇ Osman Kiliç
Turkish Journal of Biology
Polymerase chain reaction (PCR) was employed to detect the presence of cyclic AMP receptor protein (CPR) in a number of diverse organisms. In PCR, two primers specific to the crp gene of Escherichia coli were used. Staphylococcus aureus, Staphylococcus epidermidis, Lactobacillus delbrueckii and Corynebacterium veraSuş all showed the same size of PCR frağments (708 bp) and same restriction frağment length polymorphizm (RFLP).
Properties Of The Rhodopseudomonas Palustrisstrains Isolated From An Alkaline Lake In Turkey, Gönül Çeti̇nkaya Dönmez, Ayten Öztürk, Lütfü Çakmakçi
Properties Of The Rhodopseudomonas Palustrisstrains Isolated From An Alkaline Lake In Turkey, Gönül Çeti̇nkaya Dönmez, Ayten Öztürk, Lütfü Çakmakçi
Turkish Journal of Biology
31 photoheterotrophic bacteria were isolated from Lake Aksehir sediment. Identification of the strains was based on morphological properties, motility and pigment composition, and also physiological properties such as carbon utilization and ability to respire anaerobically and aerobically in the dark. All strains were identified as Rhodopseudomonas palustris, but some strains were distinct from R. palustris with regard to vitamin requirement, malate utilization and aerobic growth in the dark. Until now, R. palustris had not been reported from an alkaline lake, and the strains growing alkaline pH (9) could be new strains of R. palustris.
Isolation And Abundance Of Unicellularcyanobacteria From Mosquito Development Sites, Gönül Çeti̇nkaya Dönmez, Ayşe Elmaci, Olcay Obali, Ayten Öztürk, Lütfü Çakmakçi
Isolation And Abundance Of Unicellularcyanobacteria From Mosquito Development Sites, Gönül Çeti̇nkaya Dönmez, Ayşe Elmaci, Olcay Obali, Ayten Öztürk, Lütfü Çakmakçi
Turkish Journal of Biology
The genus composition of cyanobacteria (particularly Chroococcus sp.) and their abundance in mosquito breeding sites at Lake Mogan (Ankara, Turkey) increased from August to September. Six unicellular cyanobacteria that had different morphological properties were isolated and succesfully cultivated. According to the mode of division, these six strain were classified as the represantatives of subgroup 1 (order Choroococcales). One of the isolates was identified as Synechococcus sp. and one as Gloeocapsa sp., and four were identified as Synechocystic sp. One of the four Synechocystis spp. was shown to be capable of heterotrophic growth.
Determination Of Salt Tolerance In Some Grapevinecultivars ( Vitis Vinifera L.) Under In Vitro Conditions, Nuray Si̇vri̇tepe, Ati̇lla Eri̇ş
Determination Of Salt Tolerance In Some Grapevinecultivars ( Vitis Vinifera L.) Under In Vitro Conditions, Nuray Si̇vri̇tepe, Ati̇lla Eri̇ş
Turkish Journal of Biology
Salinity tests were conducted on Çavus, Müsküle and Sultani Çekirdeksiz grapevine cultivars under in vitro conditions. Plant materials used in the salinity test were propagated using the axillary bud culture method. Single-node shoots were subjected to five different NaCl concentrations (0.00,0.25, 0.50, 0.75 and 1.00%) in MS+5 M BA medium for two periods (4 and 8 weeks). Proliferation, growth, total chlorophyll content and viability of explants decreased due to the increase in NaCl concentration and length of treatment period. Moreover, it was determined that salt treatment caused necroses in explants and the severity of this injury varied depending on the …
Toxicity Of Zinc, Copper And Lead To Idotea Baltica(Crustacea, Isopoda), Levent Bat, Murat Sezgi̇n, Ayşe Gündoğdu, Mehmet Çulha
Toxicity Of Zinc, Copper And Lead To Idotea Baltica(Crustacea, Isopoda), Levent Bat, Murat Sezgi̇n, Ayşe Gündoğdu, Mehmet Çulha
Turkish Journal of Biology
The acute toxicity of zinc, copper and lead to the marine invertebrate Idotea baltica (Crustacea, Isopoda) was evaluated by static bioassays, calculating the LT 50 (lethality time for 50%) for males and females. Survival time decreased with increasing concentrations of zinc, copper and lead. Zinc was more toxic to Idotea than copper and lead. Lead was the least toxic of the metals tested.
Salinity Resistance Of Certain Rice ( Oryza Sativa L.)Cultivars, Mehmet Alpaslan, Aydin Güneş, Süleyman Taban
Salinity Resistance Of Certain Rice ( Oryza Sativa L.)Cultivars, Mehmet Alpaslan, Aydin Güneş, Süleyman Taban
Turkish Journal of Biology
A greenhouse experiment was carried out to evaluate the response of six rice ( Oryza sativa L.) cultivars (Ribe, Tri-445, Serhat 92, Kros 424, Baldo and Rocca) to NaCI salinity. While salinity inhibited the growth of all six cultivars, Baldo, Ribe, Rocca and Kros-424 were less affected than the other cultivars. Salt treatment increased Na and CI content of the plants, while it decreased K content. In general, the proline content and stomatal resistance of the cultivars were increased by salt treatment.
Biodegradation Of Homocyclic And Heterocyclicaromatic Compounds Byrhodopseudomonas Palustris Strains, Gönül Çeti̇nkaya Dönmez, Ayten Öztürk
Biodegradation Of Homocyclic And Heterocyclicaromatic Compounds Byrhodopseudomonas Palustris Strains, Gönül Çeti̇nkaya Dönmez, Ayten Öztürk
Turkish Journal of Biology
Six strains were isolated from Lake Aksehir (Konya-Turkey) and identified as Rhodopseudomonas palustris on the basis of physiological and morphological characteristics. The strains grew phototrophically on a variety of aromatic compounds (under illuminated anaerobic conditions), namely, benzoate, hippurate, benzyl alcohol, 2-amino benzoic acid, phloroglucinol, phenylacetic acid, catechol, pyridine and pyrazoline. Biodegradation of 2-amino benzoate, phloroglucinol, catechol, pyridine and pyrazolin by Rhodopseudomonas palustrisstrains have not been reported in the literature.
Acute Lethal Toxicity And Accumulation Of Copper Ingammarus Pulex (L.) (Amphipoda), Kemal Güven, Cengi̇zhan Özbay, Erhan Ünlü, Ali̇ Satar
Acute Lethal Toxicity And Accumulation Of Copper Ingammarus Pulex (L.) (Amphipoda), Kemal Güven, Cengi̇zhan Özbay, Erhan Ünlü, Ali̇ Satar
Turkish Journal of Biology
Gammarus pulex (L.) collected from clean sites around Kabakli pond (Diyarbakır) was acclimatized at 15°C for 10 days. The individuals were placed in 1lt. vessels and exposed to Cu ++ concentrations of 0.05, 0.08, 0.10, 0.15, 0.20, 0.30 and 0.50 ppm to determine both 24, 48, 72 and 96 h LC50 values and Cu ++ accumulation over 96h. LC 50 values at 24, 48, 72 and 96 h were calculated to be 0.2, 0.17, 0.12 and 0.1 ppm, respectively. Acute copper accumulation in gammarids exposed to various copper concentrations over 96 h was determined using an atomic absorption spectrophotometer. An …
Contributions To The Pollen Morphology Of Thefamily Compositae, Anjum Perveen
Contributions To The Pollen Morphology Of Thefamily Compositae, Anjum Perveen
Turkish Journal of Biology
The pollen morphology of 24 species of Compositae belonging to 18 genera was examined by light and scanning microscopy. The present data confirms the eurypalynous nature of the family. Delimitation of the genera on the basis of pollen characters is less marked. Pollen grains usually radially symmetrical, isopolar rarely apolar; tricolporate, often porate. Shape commonly oblate-spheroidal to prolate-spheroidal, with some suboblate to subprolate types. Tectum echinate to echinolophate, often non-echinate. Tectum in-between the spines or spinules is sub-psilate, or perforated to striate. On the basis of the exine pattern, 4 distinct pollen types are recognized viz., Pollen type-I: Dicoma tomentosa, …