Fungal biotransformation of bovine hair : Part 1 - Isolation of fungus with keratinolytic activity / B. C. Galarza 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. 93-98 Titre : Fungal biotransformation of bovine hair : Part 1 - Isolation of fungus with keratinolytic activity Type de document : texte imprimé Auteurs : B. C. Galarza, Auteur ; L. M. Goya, Auteur ; Carlos S. Cantera, Auteur ; Maria Laura Garro, Auteur ; H. E. Reinos, Auteur ; Laura M. I. Lopez, Auteur Année de publication : 2004 Article en page(s) : p. 93-98 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bovins Détérioration fongique Poils -- Biodégradation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The present study reports on the results of the “fungal biodegradation” of “hair waste” in a static solid medium using previously isolated strains of Trichophyton ajelloi and Fusarium oxysporum. The main purpose of the research programme is to upgrade the hair by biodegradation, to consider it as a raw material instead of the current modality of “throwing away” proteins to landfill and to its reuse in agricultural technology, directly or after composting and applying earthworms to generate an organic fertilizer (“vermicompost”). The fungal activity on the hair gives a degraded organic material and an extract with a pool of proteases with, amongst others, keratinolytic activity,. The enzyme activities expressed by the fungal extract are evaluated against soluble, insoluble, synthetic, and skin protein component substrates. Relationships between the different specific activities are defined to evaluate and predict the possible behaviour of the fungal extracts in the beamhouse processes. Note de contenu : - Solid state culture - Objectives - Experimental Development : Materials and Methods - Protocol of the analysis for activity assessment - Results and Discussion : Assessment of enzymatic activities of crude extracts - Aminopeptidase Activity. Determination of kinetic constants - Assessment of the degree of hair digestion - Protein profile and Isoelectric Focusing (IEF) - Zymogram - Comments on mechanisms of fungal digestion of hair - Fungal extracts in the soaking, unhairing and bating processes. Possible applications - Table 1 : Proteolytic activity of the fungal extracts of the different substrates - Table 2 : Activity Relationships for Trichophyton ajelloi and Fusarium oxysporum fungal extracts En ligne : https://drive.google.com/file/d/1Mrbx0x1BGf1ZNG_jsl1LMyTL1SX9KH-J/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39634 [article]

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Inhibitory effect of protein filling agent from bovine hair on the oxidation of Cr(III) / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 12 (12/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 12 (12/2015) . - p. 385-391 Titre : Inhibitory effect of protein filling agent from bovine hair on the oxidation of Cr(III) Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Weicai Zeng, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2015 Article en page(s) : p. 385-391 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bovins Charges (matériaux) Chrome trivalent -- Oxydation Inhibiteurs (chimie) Oxydoréduction Système pileux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In consideration of the fact that the hydrolysate of hair contains antioxidant and free radical scavenging groups, the inhibitory effect of protein filling agent prepared from bovine hair (HPFA) on the oxidation of Cr(III) was investigated. The results demonstrated that HPFA possessed remarkable reducing ability to transfer Cr(VI) to Cr(III) in solution when pH was lower than 6.0. The reduction reaction was enhanced with rise of temperature, extension of reaction time and increase of HPFA dosage. Meanwhile, the HPFA also presented a high activity to inhibit the oxidation of Cr(III) in chrome liquor in the presence of unsaturated fish oil fatliquor. More interestingly, the HPFA achieved satisfactory inhibitory effect on Cr(III) oxidation in leather in the temperature range from 20oC to 100oC. Its inhibitory activity was much higher than that of commercial protein filling agent made from collagen hydrolysate. All the results suggested that bovine hair could be used as a potential resource for preparing protein filling agent with both filling and Cr(III) oxidation inhibiting properties. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Preparation of protein filling agent from bovine hair - Cr(VI) reduction experiment - Inhibitory effect of HPFA on Cr(III) oxidation in chrome liquor - Inhibitory effect of HPFA on Cr(III) oxidation in leather - Determination of Cr(VI) content - RESULTS AND DISCUSSION : Reduction of Cr(VI) by HPFA - Inhibitory effect of HPFA on Cr(III) oxidation in chrome liquor - Inhibitory effect of HPFA on Cr(III) oxidation in leather En ligne : https://drive.google.com/file/d/1lXvMPj47ejsu3GXcyudnXy9ghXwu7__-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25048 [article]

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New methods for testing skin protection against Noxae using the Bovine Udder Skin (BUS) / Katinka Jung in IFSCC MAGAZINE, Vol. 15, N° 4 (10-11-12/2012)

[article]  inIFSCC MAGAZINE > Vol. 15, N° 4 (10-11-12/2012) . - p. 265-270 Titre : New methods for testing skin protection against Noxae using the Bovine Udder Skin (BUS) Type de document : texte imprimé Auteurs : Katinka Jung, Auteur ; Wolfgang F. Pittermann, Auteur ; Marietta Seifert, Auteur ; Thomas Herrling, Auteur Année de publication : 2012 Article en page(s) : p. 265-270 Note générale : Biobliogr. Langues : Anglais (eng) Catégories : Bovins Etude in vivo Expérimentation animale Mamelle Peau -- Inflammation Produits chimiques -- Toxicologie Protection cutanée Radicaux libres (chimie) Spectroscopie de résonance paramagnétique électronique Tests de toxicité Toxicologie cellulaire Index. décimale : 668.5 Parfums et cosmétiques Résumé : Quantitative and qualitative determination of skin irritation and skin protection through market formulations using an in vitro skin model, the perfused bovine udder (BUS) and different analytical methods, was the objective of the present research. Various noxae that are percutaneously absorbed cause skin irritation and damage through different mechanisms. Cell vitality, signs of inflammation, and the presence of inducible free radicals among the analytical parameters that enable quantification of skin damage. In this study cytotoxic effects were determined using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, and tissue levels of the pre-inflammatory mediator prostaglandin E2 in treated/untreated whole skin biopsies were assessed using an enzyme immunoassay. The inducibility of free radicals was determined by electron resonance spectroscopy techniques. Noxae (standardized chemicals and products) like detergents, coolants, toluene, and n-octane caused reduced cell vitality and metabolic activity, inflammation as evidenced by the presence of prostaglandins, and enhanced values in the inducible free radical status in in vitro bovine udder skin. The effect of the noxae is dose-dependent and permeation time-dependent, allowing construction of dose-effect curves. The induced cytotoxicity and free radical status show a positive correlation, while the inflammatory actions analyzed by the prostaglandin E2 tissue concentration do not. As a consequence, the skin compatibility of noxae and performance of skin protection formulations can be evaluated by the measurement of different cell physiological and biophysical parameters at the very early stages of skin damage. Note de contenu : - Chemicals - Skin protective formulation A - Skin protective formulation B - BUS model - UV irradiation - ESR spectrometer - Determination of the radical skin status factor RSF Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16885 [article]

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Skin parasites : a strategic approach to control / Paul Pearson in WORLD LEATHER, Vol. 9, N° 3 (05/1996)  

[article]  inWORLD LEATHER > Vol. 9, N° 3 (05/1996) . - p. 33-35 Titre : Skin parasites : a strategic approach to control Type de document : texte imprimé Auteurs : Paul Pearson, Auteur Année de publication : 1996 Article en page(s) : p. 33-35 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Animaux domestiques -- Parasites Antiparasites Bain de trempe Bovins Moutons Parasitoses Traitement chimique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The problems of incrasing levels of parasite damage to hides and skins, currently being experienced in the UK,mirror the situation in many other countries. There are a number of factors at work, but what is needed is a strategic approach for the control of parasites. Thisinvolves elements of farm management, animal husbandry techniques, proper control over how available treatments are used and the development of some form of quality feedback system to reward farmers who follow good practices. In the UK, the ain problems with parasites are with lice in cattle, and in sheep with the scab mite, along with the range of ectoparasites previously controlled by the sheep dipping regime (lice, ticks, keds and flow fly). Note de contenu : - Farming practices and misuse of treatments - The resistance of parasites to treatment - Free trade in animal diseases - A strategic approach - Parasite-free farms - Legislation, quarantine and farm assurance En ligne : https://drive.google.com/file/d/1V8LiVby4lK8IkJlRjBshMFaYlOJ5YgGH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35085 [article]

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The direct and positive influence of animal welfare on hide and skin values / V. J. Cartledge in WORLD LEATHER, Vol. 9, N° 3 (05/1996)  

[article]  inWORLD LEATHER > Vol. 9, N° 3 (05/1996) . - p. 40-42 Titre : The direct and positive influence of animal welfare on hide and skin values Type de document : texte imprimé Auteurs : V. J. Cartledge, Auteur Année de publication : 1996 Article en page(s) : p. 40-42 Langues : Anglais (eng) Catégories : Animaux -- Protection Bovins Coût de revient Cuirs et peaux -- Défauts Cuirs et peaux de bovins Exportations Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hides &nd skins represent up to 15% of the value of the carcasses and as such consitute one of the most valuable 'cuts' off the animal, comparable with rump steak. It is therefore somewhat surprising that skins are perceived as a by-product of the meat industry. It is important to firmly establish that skins and hides are seen as a co-product of the meat industry. In order that the UK and European leather industry can compete favourably in the world market place, it has risen to meet the demands of the quality end of the market place, it has risen to meet the demands of the quality end of the market. As such this requires a very high standard of quality in the raw material. The ability to meet these demands is being compromised by a belief that skins are not economically important and this results in pre- and post-mortem damage. Downgrading of skins and hides as a result of this damage is costing the UK tradt £50 million alone, and Europe £600 million. Note de contenu : - Anti-mortem factors - Health issues - The physical environment : Animal related damage - Effects of accommodation - Transport related injury - Injury in the abattoir - The effects on the meat industry - The concept of freedom food - Options for the future - Encadré 1 : Summary of the RSPCA welfare standards for beef cattle - Encadré 2 : The export of live animals - Fig. 1 : Ante-mortem damage - Fig. 2 : Health factors En ligne : https://drive.google.com/file/d/1oShL_DUokNPZqjD3SXDwvN3wcFTBByqu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35087 [article]

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