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Articles 31 - 36 of 36
Full-Text Articles in Life Sciences
Antimicrobial And Cytotoxic Activities Of Ceratonia Siliqua L. Extracts, Bi̇jen Kivçak, Tuba Mert, H. Tansel Öztürk
Antimicrobial And Cytotoxic Activities Of Ceratonia Siliqua L. Extracts, Bi̇jen Kivçak, Tuba Mert, H. Tansel Öztürk
Turkish Journal of Biology
The antimicrobial and cytotoxic activities of n-hexane, methanol, ethanol, ethyl acetate and water extracts of Ceratonia siliqua L. leaves were evaluated in this study. The antimicrobial activities of the extracts were reported against Escherichia coli ATCC 29998, Escherichia coli ATCC 25922, Escherichia coli ATCC 11230, Staphylococcus aureus ATCC 6538P, Staphylococcus aureus ATCC6538P, Staphylococcus aureus ATCC 29213, Staphylococcus epidermidis ATCC 12228, Salmonella thyphimurium CCM 5445, Enterobacter cloacae ATCC 13047, Enterococcus faecalis ATCC 29212, Pseudomonas aeroginosa ATCC 27853 as bacteria and Candida albicans ATCC 10239 as yeast-like fungi by the disc diffusion method. The cytotoxic activity of the extracts was evaluated by …
Some Properties Of Crude Carboxymethyl Cellulase Of Aspergillus Niger Z10 Wild-Type Strain, Gökhan Coral, Burhan Arikan, M. Ni̇sa Ünaldi, Hati̇ce Güvenmez
Some Properties Of Crude Carboxymethyl Cellulase Of Aspergillus Niger Z10 Wild-Type Strain, Gökhan Coral, Burhan Arikan, M. Ni̇sa Ünaldi, Hati̇ce Güvenmez
Turkish Journal of Biology
A carboxymethyl cellulase enzyme was prepared from a wild type strain of Aspergillus niger Z10. Analyses of the enzyme preparation by SDS-PAGE revealed two protein bands showing cellulolytic activity. The molecular weight of these bands was estimated to be around 83,000 and 50,000. The optimum temperature of the enzyme was observed to be around 40 °C. It was found that the enzyme's activity has a broad pH range between 3 to 9 and 41.2% of the original activity was retained after heat treatment at 90 °C for 15 min.
Production Of Poly-B-Hydroxybutyrate (Phb) By Some Rhizobium Bacteria, Nazi̇me Mercan, Belma Aslim, Zehra Nur Yüksekdağ, Yavuz Beyatli
Production Of Poly-B-Hydroxybutyrate (Phb) By Some Rhizobium Bacteria, Nazi̇me Mercan, Belma Aslim, Zehra Nur Yüksekdağ, Yavuz Beyatli
Turkish Journal of Biology
In this study, the production of Poly-b-hydroxybutyrate (PHB) was determined in 1 Rhizobium japonicum, 6 Rhizobium cicer, 8 Rhizobium spp. and Bradyrhizobium japonicum USDA 110. The content of according to dry cell weight was determined to be 1.38-40.0%. In our study, Rhizobium spp. 2426, which produced the highest percentage yield of PHB, and Rhizobium spp. 640, which produced the intermediate percentage yield of PHB, were first selected among all the strains, and then the effect of different carbon and nitrogen sources on PHB production in these strains was tested. While the strains produced less PHB in yeast extract mannitol (YEM) …
Epipelic And Epilithic Algae Of The Yedigöller Lakes (Erzurum-Turkey), Bülent Şahi̇n
Epipelic And Epilithic Algae Of The Yedigöller Lakes (Erzurum-Turkey), Bülent Şahi̇n
Turkish Journal of Biology
The epipelic and epilithic algae of the Yedigöller Lakes were studied qualitatively between June and September 2001. As a result 90 taxa (43 belonging to Bacillariophyta, 33 to Chlorophyta, 11 to Cyanophyta and three to Euglenophyta) were determined. Based on the algal community composition, the Yedigöller Lakes can be characterized as oligotrophic.
The Role Of Phospholiphase D In Phospholiphid Transaction During Cotton Seeds Maturation, Muborak Mahmusovna Abdullaeva, Mamura Muhamedovna Mulladganova, Mirzalievna M. Umarova
The Role Of Phospholiphase D In Phospholiphid Transaction During Cotton Seeds Maturation, Muborak Mahmusovna Abdullaeva, Mamura Muhamedovna Mulladganova, Mirzalievna M. Umarova
Turkish Journal of Biology
The role of phospholipase D (EC 3.1.4.4) was studied in the changing of phospholipid content during cotton seed (Gossipium hirsutum 108-G) maturation. To define phospholipase D activity cotton seed homogenates were incubated in a water-methanol environment at 37 °C for various time intervals (15, 30, 60, 120, and 300 min). Enzyme activity was judged from the formation of hydrolysis products - phosphatidic acid and phosphatidylmethanol. The phospholipid content was defined by using thin-layer chromatography with a follow up analysis of phosphorus quantity in phospholipid fractions. It was shown that phospholipase D displayed two functions during cotton seed maturation: transferase and …
The Treatment Efficiency Of Plankton In The İvedik Drinking Water Treatment Plant, Ankara, Ni̇lsun Demi̇r, Doğan Atay
The Treatment Efficiency Of Plankton In The İvedik Drinking Water Treatment Plant, Ankara, Ni̇lsun Demi̇r, Doğan Atay
Turkish Journal of Biology
The phyto-zooplankton composition and some physical and chemical properties of drinking water were investigated in the İvedik water treatment plant. The mean values of phytoplankton abundance were 641±92 and 438±55 ind/ml in the Kurtboğazı and Çamlıdere inlets, respectively. More than 50% of the phytoplankton belonging to the classes Bacillariophyceae, Chlorophyceae, Cryptophyceae and Dinophyceae were removed in the clarifiers. The treatment efficiency of phytoplankton ranged from 89 to 100% after the last chlorination. The mean values of zooplankton abundance were 93±23 and 59±18 ind/l in the Kurtboğazı and Çamlıdere inlets, respectively. The treatment efficiency of zooplankton varied between 97% and 100% …