Inhibiting lipolytic haloarchaeal damage on brine cured hide with halocin producer strains / Meral Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 69-72 Titre : Inhibiting lipolytic haloarchaeal damage on brine cured hide with halocin producer strains Type de document : texte imprimé Auteurs : Meral Birbir, Auteur ; S. Erylmaz, Auteur Année de publication : 2007 Article en page(s) : p. 69-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactériocines Les bactériocines sont une famille de peptides ou protéines synthétisés naturellement par certaines bactéries. Une bactériocine consiste généralement en un composé protéique de 20 à 60 acides aminés. Les bactériocines ne sont pas des antibiotiques mais elles possèdent des propriétés antibiotiques : - Elles peuvent être bactériocides, c'est-à-dire éliminer certains micro-organismes. - Elles peuvent être bactériostatiques, c'est-à-dire inhiber la croissance de certains micro-organismes. Cuirs et peaux -- Conservation Inhibition microbienne Lipases Les lipases sont des enzymes hydrosolubles capables d'effectuer l'hydrolyse de fonctions esters et sont spécialisées dans la transformation de triglycéride en glycérol et en acides gras (lipolyse). À ce titre, elles constituent une sous-classe des estérases. Lipolyse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The Kaldırım and Kayacık Salterns of Tuz Lake in Central Anatolia are the main salt sources of Turkey. 55% of the salt requirements of Turkey is supplied from these salterns. 492 000 and 620 000 tons of salt were produced from Kaldırım and Kayacık Salterns in 2004, respectively. Crude salt extracted from these salt sources is commonly used in hide preservation. Lipolytic extremely halophilic Archaea found in the salt may reduce hide quality. Therefore, a microbial survey was conducted to examine lipolytic activities of the strains isolated from Kaldırım and Kayacık Salterns and determine whether or not halocins which were produced by the strains of Kaldırım and Kayacık Salterns may be used to inhibit lipolytic haloarchaeal strains in brine solutions. The levels of lipase producer strains in the both salterns was found to be almost similar. 39% of Kaldırım Saltern’s strains and 43% of Kayacık Saltern’s strains produced lipase. 89% of Kaldırım Saltern’s strains and 29% of Kayacık Saltern’s strains produced halocins effective against each other. It was found that lipase negative halocin producers of both Kaldırım and Kayacık Salterns were able to inhibit lipase positive strains in these salterns. Hence, it is recommended that lipase negative halocin producers or their halocin extracts may be used in preventing the haloarchaeal deterioration that can occur during brine curing of hides when using crude salt from whatever source. Note de contenu : - Growth conditions of extremely halophilic strains - Lipase activity - Halocin activity - Table 1 : Lipase activities and sensitivities of Kaldırım Saltern strains against Kaldırım Saltern halocin producers - Table 2 : Lipase activities and sensitivities of Kayacık Saltern strains against Kayacık Saltern halocin producers En ligne : https://drive.google.com/file/d/1Vt2v6Xm7xD0XM_JcJjeaNYf6-EoS025q/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39036 [article]

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Prevention of halophilic microbial damage on brine cured hide by extremely halophilic halocin producer strains / Meral Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 3 (05-06/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 3 (05-06/2004) . - p. 99-104 Titre : Prevention of halophilic microbial damage on brine cured hide by extremely halophilic halocin producer strains Type de document : texte imprimé Auteurs : Meral Birbir, Auteur ; S. Erylmaz, Auteur ; Ayse Ogan, Auteur Année de publication : 2004 Article en page(s) : p. 99-104 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Bactéries halophiles Cuirs et peaux -- Conservation Halocines Microbiologie Peaux brutes -- Salage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tuz Lake and its salterns; Kayacik, Kaldirim and Tuzkoy Salt Mine in Central Anatolia are the major salt sources of Turkey. Crude salt extracted from these sources is commonly used in hide preservation. Proteolytic activity of extremely halophilic microorganisms, present in the salt used for hide preservation, can digest the grain surface of hides. Many bactericides have therefore, been used in the leather industry to prevent damage by halophiles. However, natural proteinaceous antimicrobial substances such as halocins which are produced by halophilic archaea may be an effective and pollution free alternative to inhibit the proteolytic halophilic archaea in brine solutions. The above reason prompted us to conduct a microbial survey of the salt and brine samples collected from different salt sources in Turkey. A total of 56 extremely halophilic strains were isolated from these salt sources. It was found that 67% of the Tuzkoy Salt Mine and Kaldirim Saltern strains had gelatinase activity. Kayacik Saltern had the highest number of gelatinase positive strains (71%), while the Tuz Lake had the lowest number of gelatinase positive strains (63%). Seven out of 19 Tuz Lake strains, 16 out of 18 Kaldirim Saltern strains, 2 out of 7 Kayacik Saltern strains and 10 out of 12 Tuzkoy Salt Mine strains produced halocins effective against each other. The most potent halocin producers were found in Kaldirim Saltern and the Tuzkoy Salt Mine. All the cells of halocin producers were Gram negative, motile and most of them were pleomorphic. The susceptibilities to different antibiotics of the halocin producer strains were examined and antibiotic test results indicated that these strains were of the family Halobacteriaceae. Although many gelatinase negative halocin producers were isolated from different salt sources, the KYS1 strain was found to be the most effective strain in inhibiting all gelatinase positive strains of Kayacik Saltern and some of the other gelatinase positive strains which could not be inhibited by the Tuz Lake and Tuzkoy Salt Mine strains. It is suggested that gelatinase negative halocin producers or their halocin extracts may be used in preventing the halobacterial deterioration that can occur during brine curing of hides. Note de contenu : - MATERIALS AND METHOODS - ISOLATION OF HALOPHILIC MICROORGANISMS : Gelatinase activity - Halocin activity - Morphological, cultural and physiological characteristics - Antibiotic tests - RESULTS : Microbiological analyses - Isolation of halophilic microorganisms - Gelatinase activity - Halocin Activity - Cell and colony morphology - Salt tolerance - Antibiotic tests - Table 1 : Average number of colonies (per gm salt or ml brine) obtained from different sampling sites - Table 2 : Screening of gelatinase and halocin activities of Tuz Lake strains against each other and KYS1 strains - Table 3 : Screening of gelatinase and halocin activities of Kaldırım Saltern strains against each other and KYS1 strain - Table 4 : Screening of gelatinase and halocin activities of Kayacik Saltern strains against each other - Table 5 : Screening of gelatinase and halocin activities of Tuzkoy Salt Mine strains against each other and KYS1 strain - Table 6 : Frequency of the morphological characteristics of 28 extremely halophilic halocin producers studied - Table 7 : Susceptibility rates of the halocin producer strains to different antibiotics En ligne : https://drive.google.com/file/d/1-JnbM3mZR_C5Q694HQuVebsBc0QBWPb5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39635 [article]

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