Pub Date : 2014-01-01DOI: 10.1016/j.cervis.2014.04.001
Marie-Lucie Kankolongo Cibaka, Jacques Gros, Sonia Collin
{"title":"Revue sur les étonnantes analogies et les différences relevées entre un cône de houblon et une baie de raisin","authors":"Marie-Lucie Kankolongo Cibaka, Jacques Gros, Sonia Collin","doi":"10.1016/j.cervis.2014.04.001","DOIUrl":"10.1016/j.cervis.2014.04.001","url":null,"abstract":"","PeriodicalId":100228,"journal":{"name":"Cerevisia","volume":"38 4","pages":"Pages 103-117"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cervis.2014.04.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75818445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-01-01DOI: 10.1016/j.cervis.2014.04.003
Mohammadreza Khalesi , Nathalie Mandelings , Zahra Shokribousjein , David Riveros-Galan , Hubert Verachtert , Kurt Gebruers , Frank Delvigne , Ivo Vankelecom , Guy Derdelinckx
Food industries are interested in finding highly stable foaming agents for product texture improvements. Hydrophobins have been mentioned many times in that context. For the production and purification of hydrophobin HFBII from Trichoderma reesei we found that foam fractionation of the fungal fermentation media is an interesting first step. After this step, the biophysical properties of the obtained foamate were studied. The foam generated by CO2 as the only sparging gas into a HFBII enriched solution in a closed environment was more stable than the foam generated by sparging with air. The equilibrium surface tension of a foamate containing 100 mg/L HFBII was measured by CAMTEL CDCA-100 tensiometry as equal to 40 mJ/m2, and was confirmed by the maximum bubble pressure tensiometer. Besides, it was found that for a long term foam preservation, the foam created by the HFBII-SDS combination is more stable than that of SDS.
{"title":"Biophysical characterisation of hydrophobin enriched foamate","authors":"Mohammadreza Khalesi , Nathalie Mandelings , Zahra Shokribousjein , David Riveros-Galan , Hubert Verachtert , Kurt Gebruers , Frank Delvigne , Ivo Vankelecom , Guy Derdelinckx","doi":"10.1016/j.cervis.2014.04.003","DOIUrl":"10.1016/j.cervis.2014.04.003","url":null,"abstract":"<div><p><span><span>Food industries are interested in finding highly stable foaming agents for product texture improvements. </span>Hydrophobins<span> have been mentioned many times in that context. For the production and purification of hydrophobin HFBII from </span></span><span><em>Trichoderma reesei</em></span> we found that foam fractionation of the fungal fermentation media is an interesting first step. After this step, the biophysical properties of the obtained foamate were studied. The foam generated by CO<sub>2</sub> as the only sparging gas into a HFBII enriched solution in a closed environment was more stable than the foam generated by sparging with air. The equilibrium surface tension of a foamate containing 100<!--> <!-->mg/L HFBII was measured by CAMTEL CDCA-100 tensiometry as equal to 40<!--> <!-->mJ/m<sup>2</sup>, and was confirmed by the maximum bubble pressure tensiometer. Besides, it was found that for a long term foam preservation, the foam created by the HFBII-SDS combination is more stable than that of SDS.</p></div>","PeriodicalId":100228,"journal":{"name":"Cerevisia","volume":"38 4","pages":"Pages 129-134"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cervis.2014.04.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90697908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1016/j.cervis.2013.10.002
Annick Lejeune , Philippe Thonart , Frank Delvigne
Les micro-organismes sont utilisés dans de nombreux domaines (agro-alimentaire, pharmaceutique, environnemental, énergétique,…) que ce soit pour la production de biomasse ou de métabolites particuliers. Le passage de l’échelle du laboratoire à l’échelle industrielle est souvent problématique car les micro-organismes sont sensibles aux conditions environnementales développées au sein du volume réactionnel. De plus, la perte de l’efficacité d’homogénéisation des bioréacteurs industriels entraîne des perturbations au niveau du métabolisme des cellules. C’est pourquoi il est important d’étudier les conditions hydrodynamiques développées au sein du réacteur. Cet article présente des méthodes de calcul et de modélisation de ces conditions. L’impact de l’hydrodynamique sur le métabolisme microbien peut être étudié par l’utilisation de réacteurs scale-down. Les techniques nouvelles permettant de réaliser un scale-up prennent en compte des caractères physiologiques des cellules, qui estiment l’impact des conditions environnementales sur le métabolisme microbien et donc la bonne réussite du procédé. Enfin, l’étude de Saccharomyces cerevisiae, micro-organisme de grand intérêt biotechnologique, est réalisée.
{"title":"Stress microbien lors du processus d’extrapolation: Approche physique et biologique","authors":"Annick Lejeune , Philippe Thonart , Frank Delvigne","doi":"10.1016/j.cervis.2013.10.002","DOIUrl":"10.1016/j.cervis.2013.10.002","url":null,"abstract":"<div><p>Les micro-organismes sont utilisés dans de nombreux domaines (agro-alimentaire, pharmaceutique, environnemental, énergétique,…) que ce soit pour la production de biomasse ou de métabolites particuliers. Le passage de l’échelle du laboratoire à l’échelle industrielle est souvent problématique car les micro-organismes sont sensibles aux conditions environnementales développées au sein du volume réactionnel. De plus, la perte de l’efficacité d’homogénéisation des bioréacteurs industriels entraîne des perturbations au niveau du métabolisme des cellules. C’est pourquoi il est important d’étudier les conditions hydrodynamiques développées au sein du réacteur. Cet article présente des méthodes de calcul et de modélisation de ces conditions. L’impact de l’hydrodynamique sur le métabolisme microbien peut être étudié par l’utilisation de réacteurs <em>scale-down</em>. Les techniques nouvelles permettant de réaliser un <em>scale-up</em> prennent en compte des caractères physiologiques des cellules, qui estiment l’impact des conditions environnementales sur le métabolisme microbien et donc la bonne réussite du procédé. Enfin, l’étude de <span><em>Saccharomyces cerevisiae</em></span>, micro-organisme de grand intérêt biotechnologique, est réalisée.</p></div>","PeriodicalId":100228,"journal":{"name":"Cerevisia","volume":"38 3","pages":"Pages 89-101"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cervis.2013.10.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80235327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1016/j.cervis.2013.10.001
Jacques Gros, Marie-Lucie Kankolongo Cibaka, Sonia Collin
{"title":"Revue sur les étonnantes analogies et les différences relevées entre un cône de houblon et une baie de raisin–Partie II: Les constituants majeurs","authors":"Jacques Gros, Marie-Lucie Kankolongo Cibaka, Sonia Collin","doi":"10.1016/j.cervis.2013.10.001","DOIUrl":"10.1016/j.cervis.2013.10.001","url":null,"abstract":"","PeriodicalId":100228,"journal":{"name":"Cerevisia","volume":"38 3","pages":"Pages 79-88"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cervis.2013.10.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86094653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-07-01DOI: 10.1016/j.cervis.2013.09.003
S.H. Duke, M.A. Vinje, C.A. Henson
{"title":"Tracking Amylolytic Enzyme Activities During Congress Mashing with North American Barley Cultivars: Comparisons of Patterns of Activity and beta-Amylases with Differing Bmy1 Intron III Alleles and Correlations of Amylolytic Enzyme Activities","authors":"S.H. Duke, M.A. Vinje, C.A. Henson","doi":"10.1016/j.cervis.2013.09.003","DOIUrl":"10.1016/j.cervis.2013.09.003","url":null,"abstract":"","PeriodicalId":100228,"journal":{"name":"Cerevisia","volume":"38 2","pages":"Pages 51-52"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.cervis.2013.09.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80187003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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