BIODETERIORATION OF LEATHER PDF

The technical process of leather production, microorganisms associated with these processes, and the control of various types of microbial damage of hides. Microbial biodeterioration of leather and its control: A review. Orlita, Alois International Biodeterioration & Biodegradation 53(3): Hides and . 19 Mar Girdle Books – Deterioration & Preservation of Leather Overcovers .. Microbial biodeterioration of leather and its control: a review.

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However, loss of plant materials before harvest is covered in plant pathology. Desulfovibrio desulfuricans reduce sulphur compounds and produces H 2 S which is then oxidized to sulphuric acid by Thiobacillus thiooxidans. Such enzymes are secreted by various groups of biodterioration. A large number of bacteria such as Erwinia sp.

Further microbial activity within a product may also be confirmed from changes occurring to the pH, viscosity, stability, etc. Actually, microbial concentrations of the cells appear from an oxygen gradient that develops as a microbial colony, in contact with the metal, utilizes the biofeterioration oxygen.

Sometimes gas bubbles are also lsather. Many hydrolysate enzymes cellulase can pose to product storage life. Production of ammonia or acid leads to alter the pH, which may change the consistency and colour of the products by developing lumps and slime. Answer Now and help others. Regrettably, indication of copyright fee is not available.

Staphylococcus aureus, Candida albicans and Aspergillus niger. Their properties with respect to efficacy tests, penetration, absorption and distribution in tanned leather was studied in this report. Tanning is an important process in the leather industry but due to the opposing effects of microbes, mainly bacteria decomposes untanned proteins in leather and fungi decomposes tanned leather containing carbohydrates, fats and proteins this industry has problems.

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The technical process of leather production, microorganisms associated with these processes, and the control of various types of microbial damage of hides, skin and leather are described in detail.

These soil fungi degrade linear and branched alkanes to aromatic rings. Some injectables contain Gram-negative bacteria, fungi, etc. The active ingredients may also become ineffective due to microbial contamination.

Orlita, Alois Online Contents Actually, microbes colonize the site which may cause excessive expansion and contraction associated with wetting and drying of colonies. Various disinfectants contain ammonia off, reported to be contaminated with pseudomonads, for example Pseudomonas aeruginosa contaminates eye drops, washes and mascara, etc.

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Microbial biodeterioration of leather and leather-containing exhibits in Kuwait National Museum

Wool, fur, and feathers mainly contain cystein rich proteins keratin that is degraded by keratinophilic fungi such as Trichophyton sp. As stated, spoilage may also occur due to the presence of dangerous metabolite products of microbial origin.

Many non-sterile pharma products contain low amount of active principles besides a large quantity of additive substances.

This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Many plastics are resistant to microbial attack but addition of various other materials makes the plastics prone to microbial attack.

Since finished leather is quite acidic, hence fungi such as Rhizopus, Mucor, Cunninghamella and Aspergillus deteriorate quite fairly, whereas bacteria are secondary colonizers. Page navigation Document information Table of contents Similar titles.

Microbial biodeterioration of leather and its control: A review

Such products later on become unstable and form separate oil and water phases. Lubricants deteriorate more quickly as they consist of an emulsion of soil finely dispersed in water, in the presence of emulsifying agent.

Cosmetics are being manufactured in the form of lotions, creams, liquids, solids and powder forms. International Biodeterioration and Biodegradation 59 3: Meaning and Process Microbiology. Microbial quality control is a necessary step to check the deterioration of crude and finished materials.

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Besides, a large number of pseudomonads corrode steel and iron structures used in building construction. The species of Pseudomonas, Citrobacter and Aerobacter secrete enzymes that breakdown the finished items and may generate unpleasant odour, particularly H 2 S. Microbial colonization of polymeric materials for space applications and mechanisms of biodeterioration: These are polymeric materials made up of polyethylene, polystyrene, polyvinyl chloride PVC and polyesters. The most affected products are soft fruits and salad vegetables; whereas grains, oilseeds and legumes are durable products and root vegetables and apples are of semi-perishable nature.

These allow various microbes to grow and secrete amylases, cellulases, etc. By continuing you agree to the use of cookies. Besides, it is used to thicken cosmetics, paints, etc.

Similar to cosmetic and lotions, they many contain preservatives. Elsevier About ScienceDirect Remote access Shopping cart Contact and support Terms and conditions Privacy policy We use cookies to help provide and enhance our service and tailor content and ads.

Due to missing records of articles, the volume display may be incomplete, even though the whole journal is available lewther TIB. Sono-leather technology with ultrasound: Old ancient monuments, natural rocks, etc.

Uses and applications of microscopy in the leather industry–a practical approach to process control and leather manufacture. A short history of investigations of biodeterioratin biodeterioration in Poland, — Entrapment of water within the colonies and crack can lead to enhanced damage.

Recent advances in biodeterioration and biodegredation: