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Biosynthesis of a UV stable pigment : prodigiosin / V. Natarajan in PAINTINDIA, Vol. XLV, N° 10 (10/1995)
[article]
Titre : Biosynthesis of a UV stable pigment : prodigiosin Type de document : texte imprimé Auteurs : V. Natarajan, Auteur ; P. K. Kamath, Auteur Année de publication : 1995 Article en page(s) : p. 23-33 Note générale : Glossaire - Bibliogr. Langues : Anglais (eng) Tags : Biosynthèse Pigment Prodigiosine 'Serratia marcescens' 'Culture de microorganismes' Mutagenèse Optimisation 'Zinc II Ion' Mutation 'Cobalt 'Milieu culture' 'Nickel 'Elément trace' 'Fer Nutriment 'Titane 'Irradiation UV' 'Molybdène Enterobacteriaceae Bactérie Index. décimale : 667.9 Revêtements et enduits Résumé : Pigment Prodigiosin is red maroon in colour and has a pyrrye dipyrryl methene structure. It is water insoluble and occurs membrane bound in the cells of Serratia marcescens, which is gram negative bacterium. As the parent strain of Serratia marcescens NRRL B284 was found to be unstable in its pigment synthesising ability, an attempt was therefore made to derive UV stable mutants employing UV induced mutagenesis. Out of seven mutants derived, a lone mutant designed M2 was found to be most promising both in terms of stable pigment producing characters as well as faster growth rates in select synthetic medium compared to the rest of the mutants. Studies on mutant M2 constitue optimisation of Carbon:Nitrogen ratio in the synthetic medium selected, followed by studies on feeding salts of trace cations during cell cultivation (as nutrient modifiers) to explore further (if any), scope for improving the UV stability of the pigment synthesised. The role/contribution towards UV stability by trace cations e.g. Mo++, Ti++, Fe++, Ni++, Co++ and Zn++ were investigated. Select UV stable pigments were evaluated for their performance in two types of air drying paints, with intersting results with respect to colour and gloss retention Note de contenu : HISTORY OF PROIDOGIOSIN
- SCOPE OF CURRENT WORK
- MATERIAL AND METHODS
- EXPERIMENTAL : Culture maintenance and inoculum preparation - Screening of media for pigment production - Optimisation of carbone : nitrogen ratio for pigment synthesis - Cell harvesting, determination of biomass, pigment extraction - Chromatographic analysis of pigment - Reversion to chromogenic variants - Role of oxygen - Straint improvement through UV mutagenesis - Screening of salts of trace cations as nutrient modifiers - Pigment screening for uv stability - Prodigiosin for paint application
- RESULTS AND DISCUSSION : Reversion to chromogenic variants - UV induced mutagenesis and effect of mutation - Effect of oxyten - Effect of optimising carbon : nitrogen in synthetic medium for mutant M2 - Composition of MSM - Effect of trace cations on UV stability of pigment - Performance of prodigiosin in paints - IR interpretationPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13665
in PAINTINDIA > Vol. XLV, N° 10 (10/1995) . - p. 23-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006457 - Périodique Bibliothèque principale Documentaires Disponible Microbial spoilage-paint and coating applications / Prashant Nighojkar in PAINTINDIA, Vol. L, N° 5 (05/2000)
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Titre : Microbial spoilage-paint and coating applications Type de document : texte imprimé Auteurs : Prashant Nighojkar, Auteur Année de publication : 2000 Article en page(s) : p. 51-56 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Matériau revêtement' 'Peinture eau' émulsion' 'Dégradation biologique' Bactérie Feuil Fungi Adjuvant Antifongique Thallophyta Index. décimale : 667.9 Revêtements et enduits Résumé : The microbes of concern to the paint and coatings industry are bacteria, yeats, fungi & algae. The bacteria, require a relatively high moisture level in their environment, are found in water based paints and other fluids containing water. The fungi not requiring such high moisture levels, grow upon the surface of paint films, adhesives and coating of any other kind i.e. water or solvent based. The yeast which seems to be midway between bacteria and fungi in many of their environmental requirements, inhabit liquid water based systems and to a contain extent, also the surface of the paint and coating products Note de contenu : - Incan-preservation
- Film preservation
Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12733
in PAINTINDIA > Vol. L, N° 5 (05/2000) . - p. 51-56[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001253 - Périodique Bibliothèque principale Documentaires Disponible Technical considerations for formulating quality water based paints - microbiological view point / Girish A. Bhagwat in PAINTINDIA, Vol. XLV, N° 9 (09/1995)
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Titre : Technical considerations for formulating quality water based paints - microbiological view point Type de document : texte imprimé Auteurs : Girish A. Bhagwat, Auteur Année de publication : 1995 Article en page(s) : p. 27-34 Note générale : Bilbliogr. Langues : Anglais (eng) Tags : 'Peinture eau' Formulation 'Dégradation biologique' Bactérie émulsion' Feuil Adjuvant Antibactérien Fungi Algae Biocide Thallophyta Index. décimale : 667.9 Revêtements et enduits Résumé : This paper attempts to bring our salient features of microbes as potential deteriogens in water based paint systems and their manifestations.
With an accent on judicisouly controlling these defects in paints, the paint formulator is being appraised of various tools and techniques, which he may choose to exercise while formulating a quality water based paint.
Lastly, various factors which need to be considered before selection of specific preservatives are being discussed so as to derive the maximun cost benefit out of its usage.Note de contenu : CLASSIFICATION OF BIODETERIORATION IN LATEX PAINTS
- BIODETERIORATION OF LATEX PAINTS IN WET STATE - SOURCES OF BACTERIAL CONTAMINATION IN PAINTS : Water - Powdered raw materials i.e extenders - Additives and intermediates - Plant hygiene conditions
- EFFECTS OF BIODETERIORATION OF LATEX PAINT IN THE CAN
- CONTROL OF BACTERIAL CONTAMINATION IN WET STATE PAINT : Good manufacturing practices (GMP) - Use of clean raw materials - Use of hard raw materials - Use of preservatives (In-can)
- ACTION OF ANTI-BACTERIAL AGENTS ON BACTERIA
- FACTORS INFLUENCING THE ACTION OF BACTERICIDES : Physical conditions - Concentration or use level - Time of contact - Type of organims - Number of organisms - Conditions of the cells - Nature of the substance contaminated - Inter-phase migration of preservatives
- PAINT FILM BIODETERIORATION
- PAINT FILM DETERIORATION IN THE INTERIORS : Growth of bacteria and yeast - Growth of fungus
- PAINT FILM DETERIORATION ON THE EXTERIORS : Growth of algae - Lichens and mosses
- FACTORS ACCELERATING PAINT FILM BIODETERIORATION
- ENVIRONMENTAL CRITERIA FOR SELECTIONS BIOCIDESPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13660
in PAINTINDIA > Vol. XLV, N° 9 (09/1995) . - p. 27-34[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006456 - Périodique Bibliothèque principale Documentaires Disponible Zosteric acid-an effective antifoulant for reducing fresh water bacterial attachment on coatings / Bi-min Zhang Newby in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 3, N° 1 (01/2006)
[article]
Titre : Zosteric acid-an effective antifoulant for reducing fresh water bacterial attachment on coatings Type de document : texte imprimé Auteurs : Bi-min Zhang Newby, Auteur ; Teresa Cutright, Auteur ; Carlos A. Barrios, Auteur ; Qingwei Xu, Auteur Année de publication : 2006 Article en page(s) : p. 69-76 Note générale : Bibliogr. Langues : Américain (ame) Tags : Bactérie Pseudomonadales Pseudomonadaceae Zostérique acide Etude expérimentale Pseudomonas putida Adhérence Evaluation performance Cinnamique dérivé Sulfate organique Antibactérien Additif Siloxane polymère Protection antisalissure Biofilm Bioencrassement Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Zosteric acid, a natural product present in eelgrass, has been found to prevent the attachment of some bacteria and barnacles. The results indicate that it may also be effective at reducing the early stages of biofouling, such as the attachment of bacteria that lead to a biofilm. In this study, the ability of zosteric acid in reducing the early stages of fouling was evaluated using attachment studies of fresh water bacteria via two approaches. First, plain coatings were submersed in water containing zosteric acid and either enriched Lake Erie bacteria or Pseudomonas putida, a model fresh water bacteria. It was found that zosteric acid with a concentration one-tenth of its EC50 (the concentration eliminates 50 % of the bacteria) was able to reduce bacterial attachment by more than 90 %. The second approach incorporated zosteric acid into silicone coatings in the presence of a common solvent to achieve the slow release of zosteric acid ; such coatings were then subjected to the bacterial attachment. A -75 % reduction in bacterial attachment was found for 1 wt % zosteric acid entrapped Sylgard® 184, a model silicone coating, but the reduction only achieved ~55% for 1 wt % zosteric acid entrapped in a commercial silicone coating, RTV11. DOI : 10.1007/s11998-006-0007-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-006-0007-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3722
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 3, N° 1 (01/2006) . - p. 69-76[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003762 - Périodique Bibliothèque principale Documentaires Disponible