Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Isolation and Molecular Characterization of Extracellular Lipase and Pectinase Producing Bacteria From Olive Oil Mills(Izmir Institute of Technology, 2004) Altan, Asena; Yenidünya, A.FazilLipases and pectinases are industrially important enzymes. These enzymes are produced by a variety of microorganisms. However there are few studies on the production of these enzymes by thermoacidophilic Bacillus species. The aim of this research was the isolation of extracellular lipase and pectinase producing thermoacidophilic Bacillus from olive oil mills and their identification by phenotypic tests, 16S-ITS rDNA RFLP and DNA sequencing. Eighty-six thermoacidophilic strains were isolated from olive, olive husk and soil contaminated with alpechin collected within different olive oil mills in Ayvalık. The strains were screened for the presence of 5 extracellular enzyme activities. These were lipase, pectinase, amylase, xylanase and cellulase. In total, 69 lipase (Tween 20 as subtrate), 32 pectinase and 68 amylase activities were detected. None of the isolates were able to produce xylanase or cellulase enzyme. All of the isolates were Gram(+) endospore forming rods, thus they were identified as Bacillus sp. Taq I was used for 16S-ITS rDNA based RFLP. The isolated strains were clustered into four groups by Taq I restriction profiles of 16S-ITS rDNA. One representative isolate among the members of each of the 16S-RFLP homology groups was chosen and used for 16S rRNA gene partial sequence analysis. Sequencing results were submitted to GenBank. So far the indicated accession numbers were obtained: AY601903 (isolate H 22 of G-3, 679 nucleotides), AY606276 (isolate S1 of G1, 330 nucleotides)Master Thesis Isolation of Haloalkaliphilic Microorganisms From Leather Industry(İzmir Institute of Technology, 2004) Çoban, Hatice Sevgi; Yenidünya, A.FazilHaloalkalophiles are extremophilic microorganisms that are adapted to saline and alkaline conditions. Different species of them have been isolated so far from soda lakes and soil samples. Haloalkalophilic microorganisms have significant adaptive mechanisms to avoid denaturing effect of salts and to balance their interior pH. Extracellular enzymes that are produced by these halophilic and alkalophilic microorganism are applicable for industrial purposes. Therefore isolation of these organisms from their habitats and study on genotypic characterization constitute initial steps for furter biotechnological studies. In this study, processing steps of leather factories and their wastewater were chosen for sampling. In order to isolate target microorganisms Horikoshi-I medium including 12% NaCl was used. After isolation microorganisms were purified. Phenotypic tests were applied (Gram staining, catalase and oxidase behaviors, spore observation by phase contrast microscope, sensitivity to antibiotics and extracellular enzyme screenings). For genotypic characterization, genomic DNA was isolated and 16S-ITS rDNA region was amplified. Differentiation was achieved according to Restriction Fragment Length Polymorphism (RFLP) method by using Hae III and Taq I endonucleases. Isolates, which represented the different RFLP patterns, were chosen for building up the haplotype groups. As a result of the study seven different RFLP haplotypes were identified.Moreover, 16S ribosomal DNA partial sequencing was also performed on some of the strains in. These haloalkalophilic microorganisms and their enzymes could be used in different biotechnological studies in the future for various industrial applications.