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Auteur Stephen D. Bryant |
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Ajouter le résultat dans votre panier Affiner la rechercheApplication of molecular techniques to identify bacteria isolated from the leather industry. Discussion / David Oppong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 4 (04/2006)
Titre : Application of molecular techniques to identify bacteria isolated from the leather industry. Discussion Type de document : texte imprimé Auteurs : David Oppong, Auteur ; Stephen D. Bryant, Auteur ; Ravindran Rangarajan, Auteur ; Susan Steele, Auteur ; David Radwell, Auteur ; Lori Hyllengren, Auteur Année de publication : 2006 Article en page(s) : p. 140-145 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : DNA-based methods are known to be accurate, precise and rapid in identifying bacteria but there is little information about the use of these techniques in the leather industry. A study was undertaken to investigate and characterize the bacterial contaminants of fresh hides using 16S ribosomal RNA sequencing techniques. The proteolytic activities of these isolates were also studied using different substrates. Organisms belonging to 16 different genera of bacteria were isolated, and many of the species found have not been previously reported for this environment. Some of the species of bacteria being reported for the first time in the tanning environment included Janibacter terrae, Acidovorax sp., Dietzia maris, Arthrobacter pr tophormiae, Comamonas sp., Brevibacterium lutescens, Jeotgalicoccus psychrophifus, Nocardiopsis sp., Delftia acidovorans, Pseudomonas cannabina, Pseudomonas fulgida and certain species of Aeromonas and Acinetobacter. Most species of bacteria found in the incoming process water were non-proteolytic. Analysis of fresh hides revealed a large number of both proteolytic and non-proteolytic bacteria. The proteolytic bacteria included several species of Aeromonas, Proteus vulgaris, and Shewanella putrefaciens. Pseudomonas sp. were common but not all of them showed proteolytic activity. Knowledge about the identities and proteolytic activities of these organisms that occur in this environment would provide a better way to design programs to control theirundesirable activities. En ligne : https://drive.google.com/file/d/1W6m6QBqQgEHmOjGdvy_Z9dJA7dyTqpd0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4017
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 4 (04/2006) . - p. 140-145[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 004230 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Fact and fantasy regarding resistance to microbicides Type de document : texte imprimé Auteurs : Vanja M. King, Auteur ; Mainul N. Haque, Auteur ; Stephen D. Bryant, Auteur Année de publication : 2001 Article en page(s) : p. 162-168 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Resistance to animal and human therapeutic antibiotics is well known and understood among both the scientific and lay community. Performance failures with industrial microbicides are commonly discussed as if the same phenomenon occurs here also. Much of this is indeed fantasy, as the mode of action of most, but not all, industrial microbicides are based on a fundamentally different principle than are therapeutic antibiotics. Industrial microbicides are designed to be broad spectrum and achieve this by attacking some fundamental principle that is present in most microorganisms and without which the organism cannot survive. Antibiotics, on the other hand, are designed to be as narrow spectrum as possible, so that side effects in the animal or human host are minimized. A clear understanding of why a broad spectrum microbicide fails in a particular situation is necessary in order to have a successful program. Application errors, such as using an inappropriate biocide and calling it resistance, will ultimately be economically detrimental. Using different modes of action products in sequence is understood in antibiotic science to encourage true resistance. This may very well also promote resistance in broad spectrum microbicides. A thorough understanding of microbicides and the particular industrial situation in which they are used is necessary to have a successful, cost-effective program, while minimizing promotion of resistance. En ligne : https://drive.google.com/file/d/1CNZqcPg-OWuMyfOezwwUd5De1p3IsSeA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4382
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 5 (05/2001) . - p. 162-168[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001563 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Measurement of bacterial populations in typical tannery soak solutions by traditional and new approaches Type de document : texte imprimé Auteurs : Ravindran Rangarajan, Auteur ; Stephen D. Bryant, Auteur ; Dean Didato, Auteur Année de publication : 2003 Article en page(s) : p. 477-486 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : It has been well documented that bacteria will readily proliferate during the typical soaking process if left unchecked. Tanners are rightfully concerned about the extent of biological activity in their soaking process and the impact this can have on the grain integrity and strength of the resulting leather. However, inquiries such as what level of microbial activity is a cause for alarm or is there a threshold activity limit below which it can be considered acceptable abound. A project was undertaken to survey several of the largest beamhouses in the USA to determine the level of microbial activity at each location as well as differences in nature of the raw material utilized and the type of control programs in place (if any). Data was collected utilizing traditional and new techniques for measurement. The results are analyzed and conclusions are drawn regarding the extent of biological activity present in typical operating conditions in the different tanneries studied. En ligne : https://drive.google.com/file/d/1BOYu3LHww3aKtdhpSxKZS7XaSzQKRVU5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4169
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 12 (12/2003) . - p. 477-486[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001594 - Périodique Bibliothèque principale Documentaires Disponible 001595 - Périodique Bibliothèque principale Documentaires Disponible
Titre : A new antifungal agent for the leather industry : S-Hexyl-S'-Chloromethyl-cyanodithiocarbimate (CHED) Type de document : texte imprimé Auteurs : Stephen D. Bryant, Auteur ; Elton L. Hurlow, Auteur ; Marilyn Whittemore, Auteur Année de publication : 2011 Article en page(s) : p. 7-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antifongiques
Cuirs et peaux -- Conservation
CyanodithiocarbimatesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Raw hides are a rich source of fats and proteins that may serve as metabolic substrates for micro-organisms, especially bacteria and fungi. These micro-organisms that are capable of invading the hide for its nutrients are present on the fresh hide during harvest as well as from the surrounding environment during and after processing at the tanner. Fungal attack on tanned collagen changes the chemical composition of the pelt in the area of growth. These changes along with fungal pigmentation will usually cause discolouration or spots or various colours depending on the infesting organism. This fungal discolouration is difficult to correct and can spoil crust or finished leather. To protect tanned hides (such as wet-blues, vegetable-tanned, free-of-chrome, or oil-tanned lathers), a fungicide is added during the pickle or tanning process. The fungicide must survive the conditions of tannage and adhere to the surface of the tanned hide to protect the leather from the time the tanningprocess is complete until the tanned hide is processed further and finished into a dry leather product. In order to be effective for the leather industry the fungicide should be stable under acid conditions, reasonably stable to UV-light, relatively unreactive with other tanning process chemicals, andhave a high affinity for the hide or skin substrate.
Historically the leather industry made use of chemistries such as organomercurials and chlorophenates which are now banned because of high level dangers regarding environment and human exposure. In recent decades these have been replaced with effective and safer chemistries such as : 2-(thiocyanomethylthio)bentothiazole (TCMTB), 3-iodopropynylbutylcarbamate (IPCB), n-octylisothiazolinone (OIT), diiodomethyl-p-tolylsulfone (DIMTS), and some phenolics.
A needs exists in the leather industry for new compounds that not only are effective fungicides, but also survive the chemical environment of the tanning process. In addition, a valuable strategy for microorganism control is to combine two ormore microbicides to expand the spectrum of control as well as to exploit potential synergies in the biocidal actions This paper describes chemical, biological, and toxicological properties of a new antifungal compound in a class of chemistry known as cyanodithiocarbimates. A patent for the use of this chemistry as a fungicide in the lather industry has been granted.En ligne : https://drive.google.com/file/d/13WPPwLTSkbZpqPvi5mpRyBNX55JUWBD7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10814
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 1 (01-02/2011) . - p. 7-10[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012825 - Périodique Bibliothèque principale Documentaires Disponible
Titre : The interaction of organic microbicides and commonly utilized commercial enzymes. Technical note Type de document : texte imprimé Auteurs : Dean Didato, Auteur ; Stephen D. Bryant, Auteur Année de publication : 1996 Article en page(s) : p. 104-107 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Organic microbicides and enzymes play a key role in the modern processing of quality leathers. Some concerns have been expressed in recent years regarding possible negative interaction between organic microbicides, and protease hydrolyzing enzymes which could lead to deactivation of the enzyme.
Buckman's research and development laboratories in Memphis, TN undertook a study of the interactions between select microbicides and protease based enzymatic preparations to determine the relationshpi between these additives when used in the same float. Siw commercial protease enzymes were assayed in vitro alone and in the presence of four selected industrial microbicides. MIcrobicides were tested at 300-600 ppm. The protease assay (55C, pH 7.8) utilized the water-insoluble substrate Azocoll (an azo dye-impregnated collagen).
None of the tested microbicides proveded any significant inhibition of any of the tested proteases.These results are discussed in relationto the use of organic microbicides and enzymes in modern leather processing.En ligne : https://drive.google.com/file/d/1r6hLGEhuLM-o-mSeRNhP4ArnPGWt0866/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7801
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 4 (04/1996) . - p. 104-107[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006943 - Périodique Bibliothèque principale Documentaires Disponible
