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JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) / Union internationale des sociétés de techniciens et chimistes des industries du cuir . Vol. 96, N° 2Mention de date : 03-04/2012Paru le : 19/04/2012 |
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Ajouter le résultat dans votre panierMechanical properties of leather from crossbreed kid from white goats upgraded by bucks of boer and nubian breeds / Piotr Zapletal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
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Titre : Mechanical properties of leather from crossbreed kid from white goats upgraded by bucks of boer and nubian breeds Type de document : texte imprimé Auteurs : Piotr Zapletal, Auteur ; Jerzy Balejko, Auteur ; Krzysztof Adamczyk, Auteur ; Dorota Maj, Auteur ; Andrzej Ochrem, Auteur Année de publication : 2012 Article en page(s) : p. 45-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de chèvresIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The studies assessed the strength of leathers in terms of their use for the production of selected grades of soft leather made from 21 F crossbreeds kid : a local breed of white goats (PB) upgraded by bucks of boer breed (B) - (PB x B), (PB) goats upgraded by Nubian bucks (N) - (PB x N) and a control group of upgraded white breed.
Ten-month old kid leather crossbreeds from crossing white goats up graded by bucks of boer and nubian breeds have the required values of strength and sensory characteristics desirable for the production of gloves and clothing. Leather PB x B crossbreeds had lower tensile strength than that determined as adequate by the standard for leather clothing. Kid leather PB x N exhibited greater resistance to tearing relative to other groups through a thicker reticular layer, which predisposes them for use as shoe uppers.Note de contenu : - Table I : Quantitative traits and parameters of skin surface efficiency
- Table II : Strength properties of leatherEn ligne : https://drive.google.com/file/d/1UHkigb33FjQylcfsknJqD6CxXwdjpk8v/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14563
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Code-barres Cote Support Localisation Section Disponibilité 13844 - Périodique Bibliothèque principale Documentaires Disponible The influence of solvents on hydrothermal stability and microstructure of combination tannage / Wang Yajuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
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Titre : The influence of solvents on hydrothermal stability and microstructure of combination tannage Type de document : texte imprimé Auteurs : Wang Yajuan, Auteur ; Shan Zhihua, Auteur ; Jiang Lan, Auteur ; Wu Ningkun, Auteur ; Shao Shuangxi, Auteur Année de publication : 2012 Article en page(s) : p. 48-55 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alun
Cuirs et peaux
Glutaraldéhyde
Microscopie électronique à balayage
Microstructures
Mimosa et constituants
Oxazolidine
Stabilité hydrothermale
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The influence of solvents on combination tanned leather was established with observation of thermal stability, and the microstructure of the leather sample before and after shrinkage. Thermal stability of leather tanned with MI (mimosa), GA (glutaraldehyde, OZ (oxazolidine) and Al (aluminium sulphate) were reported using the shrinkage temperature for helix and random coil transition after soaking in O.5, 1.0 and 2.0 mo/L urea solution had a very obvious effect on GA-MI and MI-OZ-tanned leather, whose Ts reduced to 84,2°C and 84,6°C from 94,8°C and 100,9°C respectively. The influence of acidity and basicity of the solution also cannot be ignored, and OZ-MI leather was the most susceptible one whose Ts reduced to 85,3°C from 97,7°C the thermal stability of leather involving MI and Al can be affected remarkably by glycerin. All of the leather samples showed a more obvious Ts decrease when it was soaked from the dry state than in moist state.
Scanning electron microscope (SEM) studies revealed that the microstructure of collagen is destroyed when it shrinks and that the degree of destruction depends on the cross-linking agents.Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Preparation of leather samples - Solvent treatment - Micro-morphology of sample
- RESULTS AND DISCUSSION : Hydrothermal stability of MI and GA leather - Micro-morphology of MI and GA leather - Hydrothermal stability of MI and OZ leather - Micro-morphology of MI and OZ leather - Hydrothermal stability of MI and Al leather - Micro-morphology of MI and Al leatherEn ligne : https://drive.google.com/file/d/1h6CrbyREtmKMIjmL08MwCsp86RaHhf_0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14567
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Code-barres Cote Support Localisation Section Disponibilité 13844 - Périodique Bibliothèque principale Documentaires Disponible Biodegradation of chrome-free goat garment leathers in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
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Titre : Biodegradation of chrome-free goat garment leathers Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 56-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Cuirs et peaux -- Biodégradation
Cuirs et peaux de chèvres
Microscopie électronique à balayage
Vêtements en cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The biodegradability of chrome tanned, vegetable tanned, organic phosphonium-tanned, organic phosphonium-zirconium combination-tanned leathers and organic phosphonium-aluminum combination-tanned leather was studied by outdoor soil burial. When these leathers were buried outdoor in summer for 150 days, their biodegradation rate reached 6,87 %, 27,50 %, 19,92 %, 34,83 % and 80,88 %, respectively. DSC analysis showed that the glass transition temperature (Tg) of leathers with good biodegradability were lower than for those with poor biodegradability.
The results of SEM obervations showed that the surface of leathers became obviously rough after biodegradation. The biodegradability of organic phosphonium-zirconium combination-tanned leather and organic phosphonium-aluminum combination-tanned leather were much better than that of organic phosphonium-tanned leather, which showed that zirconium and aluminum were beneficial for the growth of microorganisms and increased the biodegradability of leathers.
Vegetable tanning agents are natural products, so the biodegradability of vegetable-tanned leather was good. The biodegradability of chrome-tanned leather was the worst as chrome was toxic to microorganisms. The study provided theoretical support for the production of environmentally friendly leather and the alleviation of environmental stress.Note de contenu : - Materials and equipment
- Biodegradability of finished leatherEn ligne : https://drive.google.com/file/d/163HHwKkA-bhfRmwASNGVB9XD8vcJaLFS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14568
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Code-barres Cote Support Localisation Section Disponibilité 13844 - Périodique Bibliothèque principale Documentaires Disponible Achieving constant pressure and delay in leather thickness measurement / Duo Ning in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
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Titre : Achieving constant pressure and delay in leather thickness measurement Type de document : texte imprimé Auteurs : Duo Ning, Auteur ; Lei Zhang, Auteur ; Xin Dengke, Auteur ; Wang Panpan, Auteur ; Meng Hui, Auteur Année de publication : 2012 Article en page(s) : p. 60-63 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
Epaisseur -- Mesure
LogicielsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The International standard defines leather thickness to be value recorded 5 seconds after the start of the measurement under a constant pressure of 500g/cm2. We have developed specialized computer software to achieve the 5-second delay and constant pressure thus avoiding human errors in practice. Our software can accurately determine the starting time of the measurement and lock the valid data point automatically. By using the software in our digital leather thickness measuring device with independent intellectual property rights, we are able to measure the leather thickness in a completely automatic fashion for the first time. We report satisfactory experiment results. Furthermore, our device is portable and can be used in any production situation. Note de contenu : - RESEARCH BACKGROUND
- SOLUTIONS : Achieving required sample pressure - Achieving 5 seconds' delay
- ACHIEVING REQUIRED SAMPLE PRESSURE IN ALL DIRECTIONSEn ligne : https://drive.google.com/file/d/1OOkm567We_JxTxxy_faUyPvOsUcgwEnG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14569
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Code-barres Cote Support Localisation Section Disponibilité 13844 - Périodique Bibliothèque principale Documentaires Disponible Humic acid derivatives as tanning and retanning agents / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
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Titre : Humic acid derivatives as tanning and retanning agents Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; Josep Maria Morera, Auteur ; A. Shendrik, Auteur ; J. Jorge, Auteur ; Lluis Ollé, Auteur Année de publication : 2012 Article en page(s) : p. 64-67 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides humiques Les acides humiques sont des polymères à haut poids moléculaire, chargés négativement, de couleur noire à brun foncé, résultant d'un processus de condensation oxydative des composés phénoliques et liés à des acides aminés, des peptides et des polysaccharides. Ils sont riches en carbone mais moins riches en oxygène.
Cuirs et peaux
Retannage
TannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study examines the behaviour of three types of humic acids (natural humic acids, regenerated humic acids and sulphited humic acids) with regard to their capacity to be used as tans, and retans. The study makes use of conditions set out in a previous study (See Determination of penetration and fixation curves of leather using humic derivatives). Additionally, subsequent complementary tests were carried out using other retans that are commonly used in the tanning industry in order to compare and improve on the physical properties assessed here. Note de contenu : - EXPERIMENTAL PROCEDURES : Raw material, machinery, and reactants used - Methodology - Pretanning, tanning, and retanning tests En ligne : https://drive.google.com/file/d/14U6d_Vxv3f1lTDeuXFSxsCSTceGJ5UA2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14570
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Code-barres Cote Support Localisation Section Disponibilité 13844 - Périodique Bibliothèque principale Documentaires Disponible Effect of the removal method of hide powder on the porous properties of nanoporous silice / Satoru Dohshi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
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Titre : Effect of the removal method of hide powder on the porous properties of nanoporous silice Type de document : texte imprimé Auteurs : Satoru Dohshi, Auteur Année de publication : 2012 Article en page(s) : p. 68-70 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extraction (chimie)
Granulométrie
Particules (matière) -- Synthèse
Poudre de peaux
Silice poreuse
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nanoporous silica has been successfully synthesized using hide powder as a template. We investigated the optimum conditions for the extraction of hide powder with acidic solutions and the effect of the removal method of hide powder from hide powder/silica composite on the porous properties of nanoporous silica. It was found from thermogravimetric (TG) measurements that hide powder could be removed from hide powder/silica composite by extraction with 10vol% HCI aqueous solution at 333K for 24 hours. It was also found from N2 adsorption-desorption isotherm measurements that nanoporous silica synthesized by acid extraction possessed a large specific surface area over 1000m2 g-1. Moreover, micropore volume and micropore size for nanoporous silice synthesized by acid extraction was larger than those for nanoporous silica synthesized by calcination at high temperature. We demonstrated that the acid extraction with 10vol% HCI aqueous solutions was reasonable for the removal of hide powder from hide powder/silica composite. Note de contenu : - Optimum conditions for extraction with HCI aqueous solution
- Effect of the removal method of hide powder on the porous properties of nanoporous silicaEn ligne : https://drive.google.com/file/d/1Bhcxz1YDlSEUXEeLpUCcECkAexOWYbh1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14571
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Code-barres Cote Support Localisation Section Disponibilité 13844 - Périodique Bibliothèque principale Documentaires Disponible Microbiological aspects of hide and skin preservation by chilling / Chandra Babu Narasimhan Kannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 2 (03-04/2012)
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Titre : Microbiological aspects of hide and skin preservation by chilling Type de document : texte imprimé Auteurs : Chandra Babu Narasimhan Kannan, Auteur ; B. Swarna Kumari, Auteur ; S. H. Vimalarani, Auteur ; C. Shanthi, Auteur ; S. Karuthapandian, Auteur ; S. Sadulla, Auteur Année de publication : 2012 Article en page(s) : p. 71-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Concentration minimale inhibitrice (antimicrobiens)En microbiologie, la concentration minimale inhibitrice (CMI) est la plus faible concentration d'un produit chimique, généralement un médicament, qui empêche la croissance visible d'une ou de plusieurs bactéries. La CMI dépend du micro-organisme considéré, de l'être humain affecté (in vivo uniquement) et de l'antibiotique lui-même.
La CMI est déterminée en préparant des solutions du produit chimique in vitro à diverses concentrations croissantes, en incubant les solutions avec des groupes séparés de bactéries en culture et en mesurant les résultats en utilisant une méthode de dilution standardisée (agar ou microdilution). Les résultats se classent ensuite comme "sensible", "intermédiaire" ou "résistant" à un antimicrobien particulier en utilisant un point d'arrêt. Les points d'arrêt sont des valeurs convenues, publiées dans les directives d'un organisme de référence, comme le US Clinical and Laboratory Standards Institute (CLSI), la British Society for Antimicrobial Chemotherapy (BSAC) ou le Comité européen sur les tests de sensibilité aux antimicrobiens (EUCAST). On a pu constater des écarts importants au niveau des points d'arrêt de divers pays européens au fil des ans, et entre ceux de l'EUCAST et du CLSI.
Alors que la CMI est la concentration la plus faible d'un agent antibactérien nécessaire pour inhiber la croissance visible, la concentration bactéricide minimale (CBM) est la concentration minimale d'un agent antibactérien qui entraîne la mort bactérienne. Plus la CMI est proche de la CBM, plus le composé est bactéricide.
La première étape de la découverte d'un médicament est souvent le dépistage d'un médicament candidat de banque de données pour les CMI contre les bactéries d'intérêt. En tant que tels, les CMI sont généralement le point de départ pour de plus grandes évaluations précliniques de nouveaux agents antimicrobiens. Le but de la mesure de la concentration minimale inhibitrice est de s'assurer que les antibiotiques sont choisis efficacement pour augmenter le succès du traitement. (Wikipedia)
Cuirs et peaux -- Conservation
Cuirs et peaux -- MicrobiologieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Though chilling has been adopted as a short term preservation method for hides and skins in many western countries, no systematic attempt has been made to study the microbiological aspects related to the method. Hence, an attempt has been made in the present investigation to study the cold activity of the major skin-borne bacteria at different temperatures and their collagenolytic activity. Among the 5 bacterial isolates studied in this investigation, Macrococcus caseolyticus was found to be the most cold tolerant bacterium exhibiting growth even at 2°C. Another bacterium, bacillus sphaericus exhibited tolerance at 4°C. These two bacteria need to be controlled while designing a chilling method for the preservation of hides and skins. The inference from the collagenolytic activity study is that there is no relationship between collagenolytic activity at 37°C and the cold activity : as bacillus firmus which exhibited the maximum activity at that temperature was found to be most cold-sensitive bacterium. The other important inference from the study is that it is necessary to use a biocide in combination with chilling at 4°C if the storage duration has to be extended beyond 9 days. The two biocides investigate in the study were found to inhibith the growth of all 5 bacterial isolates for 3 weeks and the minimum inhibitory concentrations for both were determined. Note de contenu : - Putrefying microorganisms - A brief review
- Scope of the present study
- MATERIALS AND METHODS : Materials (microorganisms - The culture media and other chemical)
- METHODS : Study of the growth profile of the microorganisms at low temperatures - Collagenolytic activity of the bacterial isolates at low temperatures (by gelatin liquefaction - By hydroxyproline assay) - Determination of collagenolytic activity of bacterial isolates - Inhibition of microorganisms at low temperature using biocides
- RESULTS AND DISCUSSION : Growth profile of skin bacterial isolates at different temperatures - Collagenolytic activity of the bacterial isolates - Cold temperature inhibition of skin bacterial isolates using biocidesEn ligne : https://drive.google.com/file/d/1f-WrN1ugOL95qUNWEZf69X04n2v514Qc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14572
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