| Titre : |
Halophilic bacteria thrive in seasonal cycles |
| Type de document : |
texte imprimé |
| Auteurs : |
Waldo E. Kallenberger, Auteur ; Robert M. Lollar, Auteur |
| Année de publication : |
1986 |
| Article en page(s) : |
p. 248 - 264 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Extremely halophilic bacteria are physiologically unique bacteria. Such unique halophilic bacteria are probably common seasonally on cured hides and in curing brines. The halophiles have been associated with bright pink, red and purple discolorations on salt-cured hides for many years but have not been definitively linked to hide substance deterioration. Several extremely halophilic bacterial types were isolated from cured hides and hide curing brines for study. Several of these isolates were found to be capable of digesting hide protein. A high correlation between collagenolytic activity and gelatinolytic activity was noted, thus indicating a simple and quick potential test for hide damaging halophiles.
One of the more potent hide damaging halophiles was studied more closely. This halophile is similar in many major characteristics to Halobacterium salinarium. The one significant dissimilarity is that this halophile, as well as all other halophilic isolates, grew well in nutrient broth supplemented with a small amount of gelatin in solution as well as in brines with hide pieces. Halobacterium salinarium is not believed capable of strong growth in liquid media. It is suggested that gelatin or collagen are critical substrates for liquid media. It is suggested that gelatin or collagen are critical substrates for liquid media growth. Growth is very slow in liquid media.
In laboratory test and raceway trials hexavalent chromium proved to be an effective control agent for collagenolytic extreme halophiles. As little as 10ppm hexavalent chromium was effective in controlling halophiles in laboratory experiments, but dirty raceway brines required higher chromium concentration. Use of chromium in commercial operation may be regulated by local, state, or federal agencies, therefore such regulations and laws applicable to any particular operation should be considered before use. Other promising control measures include temperature control. These halophiles required high temperatures (greater than 30°C) to grow well and are destroyed by moderately higher temperatures (greater than 60°C). |
| En ligne : |
https://drive.google.com/file/d/1pQsgKMAr7cuXf8tw5atm95ilfCYs1evk/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9178 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 248 - 264
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Halophilic bacteria thrive in seasonal cycles in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)
