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Optimization of the assay of bate and drum liquor for proteolytic activity / Samuel M. Mozersky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 8 (08/1995)
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Titre : Optimization of the assay of bate and drum liquor for proteolytic activity Type de document : texte imprimé Auteurs : Samuel M. Mozersky, Auteur ; Marvin A. Baynes, Auteur ; David G. Bailey, Auteur Année de publication : 1995 Article en page(s) : p. 235-242 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In two recent publications from this laboratory, procedures were described for measuring the proteolytic activity of bate and (bate-containing) drum liquor using hide powder azure (HPA) as substrate. Subsequent to that work, it was found that HPA sometimes loses much of its sensitivity to proteolytic enzymes of storage. This led to a study of the substrate and of related factors affecting the assay, which resulted in substantial revision of the assay procedure, as follows. HPA is activated prior to use by reduction of particle size and a mild heat treatment, and200mg used per assay (instead of 50mg). A clarified extract of the sample to be assayed is introduced into the incubation tube (a 25 mm ´ 150 mm screw-cap tube) instead of the crude material. Since proteolytic activity was found to change by 10 to 15% per °C, good temperature control is necessary; for research purposes, a water-bath shaker-incubator operating at 37°C and 400 rpm is recommended. Incubation time has been reduced from 20 min to 10 min at ambient temperature (ca. 25°C), 5 min at 37°C. These modifications have resulted in the following advantages: (1) substantially increased sensitivity, (2) a linear dependence of the color measured on enzyme concentration, and (3) improved reproducibility. En ligne : https://drive.google.com/file/d/1m4ZmYp-cbBTCpJwnoL3XdK7s8DMhbC5P/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7931
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXX, N° 8 (08/1995) . - p. 235-242[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006934 - Périodique Bibliothèque principale Documentaires Disponible Pilot-plant study of flocculation of suspended solids in lime-sulfide unhairing effluents / E. H. Bitcover in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)
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Titre : Pilot-plant study of flocculation of suspended solids in lime-sulfide unhairing effluents Type de document : texte imprimé Auteurs : E. H. Bitcover, Auteur ; J. E. Cooper, Auteur ; David G. Bailey, Auteur Année de publication : 1980 Article en page(s) : p. 108-118 Note générale : bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : We have studied that removal of suspended solids from commercial unhairing effluents by means of a pilot-plant continuous flow apparatus. effluents were obtained from tanneries which processed either fresh or salt-cured hides in paddle vats or hide processors. Approximately 80 to 85 percent of the suspended solids were removed from the effluents tested. The results subtantiate earlier laboratory studies that established the ranges of effluent compositions (pH, salt content, suspended solids, and soluble organic content) for which specific flocculation treatments are effective. Note de contenu : - Unhairing wastes
- Flocculating agents
- Composition variables
- Analytical methods
En ligne : https://drive.google.com/file/d/1DYeyr3Si9CwlyngNbbaU7PoHivAjk1FA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17730
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXV (Année 1980) . - p. 108-118[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008513 - Périodique Archives Documentaires Exclu du prêt Preservation of cattle hides with potassium chloride / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 1 (01/1995)
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Titre : Preservation of cattle hides with potassium chloride Type de document : texte imprimé Auteurs : David G. Bailey, Auteur Année de publication : 1995 Article en page(s) : p. 13-21 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Research was conducted to evaluate the effectiveness of Potassium chloride(KCl) as an alternative to sodium chloride(NaCl)for the preservation of cattle hides. The incentive for this research is that concentrated KCl solutions do not cause the environmental problems that are associared with satured brine. Excess KCl brine from a curing raceway can be applied directly to the soil as a fertilizer providing potassium, a necessary plant macro nutrient. While KCl is more expensive than salt on a pound for pound basis the savings in brine disposal is some situations will more than make up the difference.On a laboratory scale we have demonstrated that cattle hide samples soaked in concentrated solutions of KCl and drained of excess moisture appeared to be well preserved after six months. A matched side study of KCl cured hides vs. NaCl cured hides was conducted in which the sides were stored for forty days before tanning. No signifiant differences were observed in two different lines of leather manufactured from hides. Note de contenu : - MATERIALS AND METHODS : The initial laboratory scale experiment - Pilot plant scale tanning experiments - Industrial scale tanning experiment
- RESULTS AND DISCUSSION : The initial laboratory scale experiment - Pilot plant scale tanning experiments - Industrial scale tanning experimentsEn ligne : https://drive.google.com/file/d/11HMY82D1_wbjtFlJQ2LncdRZ4ugDPo3G/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8020
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXX, N° 1 (01/1995) . - p. 13-21[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006927 - Périodique Bibliothèque principale Documentaires Disponible Preservation of cattlehides with electron beam irradiation / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
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Titre : Preservation of cattlehides with electron beam irradiation Type de document : texte imprimé Auteurs : David G. Bailey, Auteur ; Shusheng Wang, Auteur Année de publication : 1989 Article en page(s) : p. 37-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Conservation
Cuirs et peaux de bovins
Faisceaux électroniques
Traitement par irradiationIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In an earlier paper it was demonstrated that electron beam irradiated fresh hide samples stored in a sealed container could be preserved for six months. In this work leather prepared from cattlehide samples preserved by electron beam irradiation was evaluated. Leather made from electron beam irradiation preserved cattlehides has a reduced tensile strength and ball burst compared to leather made from unirradiated hides but was comparable in subjective evaluations such as grain quality and break. It was established that the amount of irradiation required for effective preservation could be reduced by pretreatment of the hide with a bactericide. The results also suggest that the area yield of leather from irradiated hides is similar to the area yield of fresh hides. Note de contenu : - Sample preparation
- Electron beam irradiation
- Sample storage and evaluation
- Leather preparation
- Physical testsEn ligne : https://drive.google.com/file/d/1s5ENrUF_da4liSCU2B-LKiv1-fi01uFT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16515
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Code-barres Cote Support Localisation Section Disponibilité 008089 - Périodique Bibliothèque principale Documentaires Disponible Preservation of hides with sulfite. I. Concentration and application effects on small-scale experiments with cattlehides / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
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Titre : Preservation of hides with sulfite. I. Concentration and application effects on small-scale experiments with cattlehides Type de document : texte imprimé Auteurs : William J. Hopkins, Auteur ; David G. Bailey, Auteur Année de publication : 1975 Article en page(s) : p. 248-2260 Langues : Américain (ame) Catégories : Acétique, Acide L'acide acétique (du latin acetum) ou acide éthanoïque est un acide carboxylique de formule chimique : C2H4O2 ou CH3COOH.
L'acide acétique pur est aussi connu sous le nom d'acide acétique glacial. C'est un des plus simples des acides carboxyliques. Son acidité vient de sa capacité à perdre le proton de sa fonction carboxylique, le transformant ainsi en ion acétate CH3COO-. C'est un acide faible.
L'acide acétique pur est un liquide très faiblement conducteur, incolore, inflammable et hygroscopique. Il est naturellement présent dans le vinaigre, il lui donne son goût acide et son odeur piquante (détectable à partir de 1 ppm21).
C'est un antiseptique et un désinfectant.
L'acide acétique est corrosif et ses vapeurs sont irritantes pour le nez et les yeux.
Il doit être manipulé avec soin. Quoi qu'il n'ait pas été jugé cancérigène ou dangereux pour l'environnement, il peut causer des brûlures ainsi que des dommages permanents à la bouche, au nez, à la gorge et aux poumons. À certaines doses et en co-exposition chronique avec un produit cancérigène, son caractère irritant en fait un promoteur tumoral de tumeurs (bénignes et malignes)21. Ceci a été démontré expérimentalement chez le rat.
Bactéries -- Comptage
Cuirs et peaux -- Analyse
Cuirs et peaux -- Conservation
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de bovins
Essais dynamiques
Résistance à la traction
Sulfate de sodiumLe sulfate de sodium est un composé chimique courant formé d'un ion sulfate et de deux ions sodium. Lorsqu'il est anhydre, il prend l'apparence d'un solide cristallin blanc de formule chimique Na2SO4. La forme déca-hydratée, Na2SO4·10H2O, est connue sous le nom de sel de Glauber ou mirabilite. Parmi un grand nombre d'usages différents, les principales utilisations du sulfate de sodium concernent la fabrication des détergents et dans le procédé de Kraft de traitement de la pâte à papier. La moitié environ de la production mondiale provient de l'extraction de la forme naturelle décahydratée, et l'autre moitié de productions secondaires dans des procédés de l'industrie chimique.
sulfite de sodiumIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study examines the effects on the length of hide preservation of (a) sulfite concentration, (b) sodium bisulfate and acetic acid as acidulants, (c) sodium bisulfite alone, and (d) various methods of handling and storing the treated hide samples. Small-scale studies indi-cated that short-term (six days) preservation could be accomplished at concentrations of 0.25 percent sodium sulfite and that 0.5 percent sulfite in combination with one percent acetic acid resulted in long-term (30 days) preservation. The need to containerize the treated side was demonstrated. Sides that were preserved with sulfite, drained, and stored in closed containers for six days at ambient temperatures were made into acceptable leather. An estimated cost of materials for the sulfite preservation compared favorahly with the material costs for brine curing. Note de contenu : - Initial experiments - Effect of treatment on leather quality - matched side experiment - Treatment costs
- Table 1 : The effects of sulfite concentration and various sulfite treatments on hide preservation as jusged by bacterial count and sample odor
- Table 2 : The effect of various storage methods on treated hide pieces as judged by bacterial count
- Table 3 : The effect of various storage methods on treated hide pieces as judged by bacterial counts
- Table 4 : The effect of sulfite concentration and float on preservation of hide pieces as judged by baterial counts
- Table 5 : The effect of sulfite concentration and float on preservation of hide pieces as judges by bacterial counts
- Table 6 : Bacterial counts on matched sides comparing brined sides and acid sulfite treated sides after six days of storage
- Table 7 : A matched side comparison of the tensile strengths of leather prepared from brine cured and acid sulfite treated hides
- Table 8 : A comparison of the costs of material for salt and sulfite treatments on 100 LBS. fresh hideEn ligne : https://drive.google.com/file/d/1BYflZaYySpT9U1YXujNCKkYIxeOMNKQ1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38787
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 248-2260[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008509 - Périodique Archives Documentaires Exclu du prêt Preservation of hides with sulfite. II. A matched side comparison of leathers from hides preserved with sodium sulfite or brine curing / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
PermalinkProgress on the use of gaseous sulfur dioxide to preserve hides. The effect of concentration and exposure time / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
PermalinkProtein removal from cattlehides during brine curing I. Identification of bovine serum albumin as the major salt soluble protein component / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), LXXXVII, N° 1 (01/1992)
PermalinkRapid oxidative unhairing with alkaline calcium peroxide / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 6 (06/2003)
PermalinkA review of the uses of enzymes in the tannery / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
PermalinkStructure of bovine skins and hair root - A scanning electron microscope investigation / Matthias Wagner in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 10 (12/1999)
PermalinkA study of the extremely halophilic microorganisms found on commercially brine-cured cattle hides / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 8 (08/1993)
PermalinkTannery-scale evaluation of hide preservation by sulfite acetic acid applied in a drum and a hide processor / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
PermalinkThe effect of temperature and mechanical action on salt uptake during brine curing of cattlehides / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXV (Année 1990)
PermalinkThe 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)
PermalinkThe preservation of animal hides and skins with potassium chloride / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 12 (12/1996)
PermalinkThe preservation of hides and skins / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 8 (08/2003)
PermalinkTreatment of beamhouse effluent with an aerobic fixed-film reactor / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
PermalinkUnhairing method identified as source of n-nitrosodimethylamine in tannery atmosphere / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
PermalinkUse of TOC as an alternative to COD for monitoring the biooxidation of tannery unhairing waste / J. E. Cooper in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)
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