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Auteur Meral Birbir
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Marmara University - Goztepe - Istanbul - Turkiye
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The effect of conservation defects on the Suede quality of double-face / Behzat Oral Bitlisli in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 12 (12/2004)
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Titre : The effect of conservation defects on the Suede quality of double-face Type de document : texte imprimé Auteurs : Behzat Oral Bitlisli, Auteur ; Meral Birbir, Auteur ; I. Yasa, Auteur ; O. Sari, Auteur ; Bahri Basaran, Auteur ; Huseyin Ata Karavana, Auteur Année de publication : 2004 Article en page(s) : p. 494-501 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this research, the effects of microorganisms on suede quality of double-face leather were examined. The bacterial numbers on salted sheepskin samples were found as 1.8x106-4.3x107 cfu/g on solid medium and 1.9x106-4.7x107 cfu/g on halophile medium containing 10-30% NaCl. However it was found that salted sheepskins contained 4.4x101-2.0x104 cfu/g of fungi. While 53-74% of halophilic bacteria and 39-58% of fungi showed proteolytic activity, 47-62% of halophilic bacteria and 35-54% of fungi showed lipolytic activity. It was observed that defective light stained areas on suede surface of finished double-face leathers were caused by microorganisms on salted sheepskins and that these defects correspond to 35% of the total double-face leathers amount. Consequently, it was decided that the proteolytic and lipolytic activities of microorganisms on the flesh side of the sheepskins decreased the suede quality and caused economical losses. En ligne : https://drive.google.com/file/d/1uj7Rf4HbcbOesDGVa6fnGsFnkFOBGtJs/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4238
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIX, N° 12 (12/2004) . - p. 494-501[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001610 - Périodique Bibliothèque principale Documentaires Disponible The effects of alternating and direct electric currents on moderately halohilic bacteria in leather industry / Pinar Caglayan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 6 (11-12/2016)
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Titre : The effects of alternating and direct electric currents on moderately halohilic bacteria in leather industry Type de document : texte imprimé Auteurs : Pinar Caglayan, Auteur ; Meral Birbir, Auteur ; Ayse Ogan, Auteur ; Antonio Ventosa, Auteur ; Cristina Sánchez-Porro, Auteur ; Yasar Birbir, Auteur Année de publication : 2016 Article en page(s) : p. 307-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Bactéries -- Inactivation
Courants électriques
Cuirs et peaux -- Conservation
Cuirs et peaux de moutonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Proteolytic and lipolytic moderately halophilic bacteria, originate from salt, may be found on salted sheep skins. Microbial spoilage of sheepskin usually result a from the failure to inactivate proteolytic and Iipolytic micro-organisms during skin preservation. To solve this problem, an effective inactivation method to be used in the leather industry was examined in this study. Protease and lipase activities of moderately halophilic Staphylococcus saprophyticus subsp. saprophyticus (TR5), Bacilius pumilus (DB5), Bacillus licheniformis (DBA2), Gracilibacillus dipsosauri (EK2) and Idiomarina loihiensis (GA3), isolated from salted sheepskins, were examined : Protease activity of each test isolate was determined by bath gelatin agar medium and casein digestion assay at 280nm. Lipolytic activity of each test isolate was determined by bath Tween 80 agar medium and measuring hydrolysis of p-nitrophenylbutyrate to p-nitrophenol at 405nm. Antibiotic sensitivities of test isolates to novobiocin, penicillin G, tetracycline, streptomycin, erythromycin, tobramycin, kanamycin and gentamicin were tested using disc diffusion susceptibility method. These isolates were found to be proteolytic, lipolytic and resistant to aforementioned antibiotics. inactivation effects of direct electric currents and alternating electric currents (0.5A, 1.0A, 1: 5A and 2.0A) on the mixed culture of these isolates were separately examined in liquid medium containing 25% NaCl. The mixed culture was killed in 1 minute by 0.5A direct current and 1.5A affernating current treatments. However, 0.5A alternating current and 1.0A alternating current treatments eliminated these micro-organisms respectively in 15 minutes and 10 minutes. In conclusion, electric current applications hold great potentiel for the eradication of proteolytic and lipolytic, antibiotic-resistant, moderately halophilic bacteria in leather industry. Note de contenu : - EXPERIMENTAL PROCEDURES : Moderately halophilic bacterial isolates - Proteolytic and lipolytic activities of moderately halophilic bacteria - Antimicrobial susceptibility test - The electrochemical treatment system
- RESULTS AND DISCUSSION : Antibiotic resistanceEn ligne : https://drive.google.com/file/d/1694CJoD9Uwle2gArKMHAUoJyAkxmVqSI/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27666
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 6 (11-12/2016) . - p. 307-313[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18546 - Périodique Bibliothèque principale Documentaires Disponible The impact of halophilic organisms on the grain quality of brine cured hides / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 2 (02/1996)
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Titre : The impact of halophilic organisms on the grain quality of brine cured hides Type de document : texte imprimé Auteurs : David G. Bailey, Auteur ; Meral Birbir, Auteur Année de publication : 1996 Article en page(s) : p. 47-51 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Halophilic organisms have long been thought to be associated with reduced grain quality of brine cured cattle hides. However, a direct correlation of the presence of halophiles and damage to surface of grain has not been previously reported. In this research, a fresh cattle hide was cured in saturated brine to which an innoculum of several isolates of extremely halophilic organisms were added. These halophilic organisms were previously isolated from commercially brine-cured hides. After curing, samples prepared from the hide were stored at three different temperatures, 39°F, 70°F and 106°F. Half of the samples were tanned after four weeks of storage and the remainder of the samples were tanned after seven weeks. Physical testing showed that there was no difference in physical strength between the inoculated and uninoculated samples. Grain damage was observed visually in the samples held for seven weeks at 106°F. Scanning electron micrographs clearly show the nature of this damage. En ligne : https://drive.google.com/file/d/1qFhgFTIvn4CZfLXKUrx4LeSNHvFMbtVo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7830
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 2 (02/1996) . - p. 47-51[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006941 - Périodique Bibliothèque principale Documentaires Disponible Treatment using both direct and alternating electric currents on hide Bacteria in brine curing and pre-soaking liquors / Yasar Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 2 (03-04/2014)
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Titre : Treatment using both direct and alternating electric currents on hide Bacteria in brine curing and pre-soaking liquors Type de document : texte imprimé Auteurs : Yasar Birbir, Auteur ; Nazli Dolek, Auteur ; Meral Birbir, Auteur Année de publication : 2014 Article en page(s) : p. 47-55 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries -- Inactivation
Bain de saumure
Courants électriques
Cuirs et peaux -- Conservation
Electrolyse
Peaux brutes -- TrempeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Animal hides support the growth of highly diverse Gram-negative and Gram-positive bacterial populations. These bacterial populations cause important damage to the hides during brine curing and pre-soaking processes, subsequently reducing the quality of the final leather. It is usually difficult to combat the diverse resistance offered by both Gram-negative and Gram-positive bacteria in these processes in a short time with conventional antimicrobials.
Therefore, the present study examined the inactivation effect of a combined electric current treatment using both 1.5A direct and 2A alternating electric currents on: 1) each test isolate of Gram-negative bacteria (Enterobacter cloacae, Pseudomonas luteola, Vibrio fluvialis) and their mixed culture; 2) each test isolate of Gram-positive bacteria (Enterococcus faecium, Bacillus pumilus, Staphylococcus cohnii) and their mixed culture; 3) the mixed culture of test bacteria except for Gram-positive endospore-forming bacteria (Bacillus pumilus); 4) the mixed culture of all bacteria in liquid media containing organic substances and 25% NaCI. The test bacteria were isolated from salt-pack-cured hides. Two, three and four log reduction factors of all test bacteria were observed after the application of the direct electric current applied together with alternating electric current treatment for 12, 26 and 34 minutes, respectively. As a conclusion, the combined electric treatment applied for 34 minutes was found to be fairly effective in reducing the bacterial cell count to a relatively low level at which bacterial damage to the hides is reduced in brine curing and pre-soaking liquors.Note de contenu : - EXPERIMENTAL PROCEDURES : Test strains - Preparation of the test isolates - The electrolysis cell system - Inactivation of test bacteria with a combined treatment using both direct and alternating electric currents
- RESULTS AND DISCUSSION : Use of electric currents reported in the literatureEn ligne : https://drive.google.com/file/d/1WJtYPXZpN3vkjZY99o4AeFG3p4SMF9uK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21134
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 2 (03-04/2014) . - p. 47-55[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16193 - Périodique Bibliothèque principale Documentaires Disponible