Der Wassergehalt des von den Pflanzen produzierten Nektars kann variieren. Um seine Konservierung in den Waben zu gewährleisten, darf er nicht gären. Deshalb wird er von den Bienen in Honig umgewandelt, indem sie seinen Wassergehalt senken und folglich den Zuckergehalt erhöhen. Dies verhindert die Entwicklung der Mikroorganismen. In der Dunkelheit des Bienenstocks ist es schwierig, den Herstellungsprozess des Honigs zu beobachten. Aus diesem Grund ist er auch nur wenig erforscht. Um die Umwandlung von Nektar in Honig zu untersuchen, haben wir die Technik der Tomographie eingesetzt. Sie ermöglicht es, den Zuckergehalt des eingelagerten Nektars sehr präzise zu messen, ohne den Bienenstock öffnen zu müssen und das Bienenvolk zu stören.
Pubblicazioni Hélène Berthoud-dit-Gallon Marchand
Chollet M., Berthoud-dit-Gallon Marchand H., Guggenbühl B., Wenzel C., Irmler S.
Impact of ripening time and addition of Lactobacillus helveticus on the maturity of Swiss Raclette cheese.
In: IDF Cheese Science & Technology. 11-13 April, Dublin. 2016, 1.
Berthoud-dit-Gallon Marchand H.
Detection and typing of Lactobacillus parabuchneri, a microorganism with harmful and detrimental effects in cheese.
In: IDF Cheese Science & Technology. 11-13 April, Dublin. 2016, 1-17.
Bogicevic B., Berthoud-dit-Gallon Marchand H., Portmann R., Bavanantharajah T., Meile L., Irmler S.
Cysteine biosynthesis in Lactobacillus casei: identification and characterization of a serine acetyltransferase.
FEMS Microbiology Letters, 363, (4), 2016, 1-7.
Wenzel C., Bär C., Wüthrich D., Bruggmann R., Chollet M., Wechsler D., Berthoud-dit-Gallon Marchand H., Irmler S.
Influence of pH on gene expression in Lactobacillus parabuchneri FAM21731.
In: 6th Congress of European Microbiologists. 7-11 June, Ed. FEMS, Maastricht. 2015, 1.
Bär C., Wenzel C., Wüthrich D., Bruggmann R., Bavanantharajah T., Eugster-Meier E., Berthoud-dit-Gallon Marchand H., Irmler S.
Expression profiling of pediococcus acidilactici FAM18098 with a focus on threonine and serine catabolism.
In: 6th Congress of European Microbiologists. 7-11 June, Ed. FEMS, Maastricht, Netherlands. 2015, 1.
Storari M., Wüthrich D., Bruggmann R., Berthoud-dit-Gallon Marchand H., Arias E.
Draft genome sequences of Clostridium tyrobutyricum strains FAM22552 and FAM22553, isolated from Swiss semihard red-smear cheese.
Genome, 2, (3), 2015, 1-2.
Haldemann J., Berthoud-dit-Gallon Marchand H., Roetschi A., Von Ah U., Rollier D., Eugster E.
Tête de moine AOP: une nouvelle culture pour certifier son origine.
Recherche Agronomique Suisse, 4, (10), 2013, 448-450.
Irmler S., Houstek D., Bavanantharajah T., Oberli A., Roetschi A., Guggenbühl B., Berthoud-dit-Gallon Marchand H.
Properties of alanine dehydrogenase from pediococcus acidilactici FAM18098.
In: The 5th Congress of European. July 21-25, Ed. FEMS, Leipzig, Germnay. 2013, 1.
Irmler S., Bavan T., Oberli A., Roetschi A., Badertscher R., Guggenbühl B., Berthoud H.
Catabolism of Serine by Pediococcus acidilactici and Pediococcus pentosaceus.
Applied and Environmental Microbiology, 79, (4), 2013, 1309-1315.
Bogicevic B., Berthoud H., Portmann R., Meile L., Irmler S.
CysK from Lactobacillus casei encodes a protein with O-acetylserine sulfhydrylase and cysteine desulfurization activity.
Applied Microbiology and Biotechnology, 2011.
Bogicevic B., Irmler S., Portmann R., Meile L., Berthoud H.
Characterization of the cysK2-ctl1-cysE2 gene cluster involved in sulfur metabolism in Lactobacillus casei .
International Journal of Food Microbiology, 2011.
Dainat B., Ken, T., Berthoud H., Neumann P.
Tropilaelaps: un altro acaro vettore dei virus delle api.
L'Ape, 93, (7-8), 2010, 8-10.
altre lingue:
Berthoud H., Imdorf A., Haueter M., Radloff S., Neumann P.
Virus infections and winter losses of honey bee colonies (Apis mellifera).
Journal of Apicultural Research, 49, (1), 2010, 60-65.
Walther B., Jakob E., Irmler S., Berthoud H., Wyss U., Wechsler D., Portmann R.
Biogene Amine in Käse.
In: ALP-Kolloquium. 22.10., Ed. ALP-Haras, Bern. 2009, 1-72.
Bogicevic, B., Irmler S., Meile, L., Berthoud H.
Isolation and characterization of a cysteine biosynthetic gene in Lactobacillus caseiencoding cysteine lyase and synthase activity [Poster].
BioMicroWorld, Lisbon, 2-4 Dec. 2009, 2009, 1-1.
Irmler, S., Schaefer, H., Beisert, B., Rauhut, D., Berthoud, H.
Identification and characterization of a strain-dependent cystathionine β/ɣ-lyase in Lactobacillus casei potentially involved in cysteine biosynthesis.
FEMS Microbiology Letters, 295, (1), 2009, 67-76.
Casey, M.G., Isolini, D., Amrein, R., Wechsler, D., Berthoud, H.
Naturally occuring genetic markers in lactobacilli and their use to verify the authenticity of Swiss Emmental PDO cheese.
Dairy Science and Technology, 28.03.2009, 2008, 457-466.
Dainat, B., Ken, T., Berthoud, H., Neumann, P.
The ectoparasitic mite Tropilaelaps mercedesae (Acari, Laelapidae) as a vector of honeybee viruses.
Insectes Sociaux, (inpress), 2008.
Roetschi, A., Berthoud, H., Kuhn, R., Imdorf, A.
Infection rate based on quantitative real-time PCR of Melissococcus plutonius, the causal agent of European foulbrood, in honeybee colonies before and after apiary sanitation.
Apidologie, 39, 2008, 362-371.
Irmler, S., Raboud, S., Beisert, B., Rauhut, D., Berthoud, H.
Cloning and Characterization of Two Lactobacillus casei Genes Encoding a Cystathionine Lyase.
Applied and Environmental Microbiology, (1), 2008, 99-106.
