Antonie van Leeuwenhoek
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Co-culture with potentially probiotic microorganisms antagonises virulence factors of Clostridium difficile in vitro
Antonie van Leeuwenhoek - Tập 98 - Trang 19-29 - 2010
Toxigenic strains of Clostridium difficile were co-cultured with different
strains of bifidobacteria and lactobacilli. Spent culture supernatants were
tested for biological activity on cultured Vero cells. Co-culture of C.
difficile with some potentially probiotic strains lead to a reduction of the
biological activity of spent culture supernatants. The observed effects cannot
be ascribed either to...
Streptomyces bullii sp. nov., isolated from a hyper-arid Atacama Desert soil
Antonie van Leeuwenhoek - - 2013
Bacterial quorum sensing: circuits and applications
Antonie van Leeuwenhoek - Tập 105 - Trang 289-305 - 2013
Bacterial quorum sensing (QS) systems are cell density—dependent regulatory
networks that coordinate bacterial behavioural changes from single cellular
organisms at low cell densities to multicellular types when their population
density reaches a threshold level. At this stage, bacteria produce and perceive
small diffusible signal molecules, termed autoinducers in order to mediate gene
expression....
Prevalence of the genus Cladosporium on the integument of leaf-cutting ants characterized by 454 pyrosequencing
Antonie van Leeuwenhoek - Tập 109 - Trang 1235-1243 - 2016
The relationship of attine ants with their mutualistic fungus and other
microorganisms has been studied during the last two centuries. However, previous
studies about the diversity of fungi in the ants’ microenvironment are based
mostly on culture-dependent approaches, lacking a broad characterization of the
fungal ant-associated community. Here, we analysed the fungal diversity found on
the integ...
PCR-RFLP analysis of the IGS region of rDNA: a useful tool for the practical discrimination between species of the genus Debaryomyces
Antonie van Leeuwenhoek - Tập 90 - Trang 211-219 - 2006
The amplification by PCR of the intergenic spacer region (IGS) of rDNA followed
by restriction fragment length polymorphism (RFLP) analysis was evaluated as a
potential method for discriminating the 16 species belonging to the genus
Debaryomyces. The digestion of this region with some or all the enzymes used in
this study (HapII, HhaI and MboI) produced species-specific patterns that
permitted dif...
Gluconacetobacter diazotrophicus PAL5 possesses an active quorum sensing regulatory system
Antonie van Leeuwenhoek - Tập 106 - Trang 497-506 - 2014
The endophytic bacterium Gluconacetobacter diazotrophicus colonizes a broad
range of host plants. Its plant growth-promoting capability is related to the
capacity to perform biological nitrogen fixation, the biosynthesis of
siderophores, antimicrobial substances and the solubilization of mineral
nutrients. Colonization of and survival in these endophytic niche requires a
complex regulatory network...
Zinc oxide nanoparticle inhibits the biofilm formation of Streptococcus pneumoniae
Antonie van Leeuwenhoek - Tập 111 - Trang 89-99 - 2017
Biofilms are structured consortia of microbial cells that grow on living and non
living surfaces and surround themselves with secreted polymers. Infections with
bacterial biofilms have emerged as a foremost public health concern because
biofilm growing cells can be highly resistant to both antibiotics and host
immune defenses. Zinc oxide nanoparticles have been reported as a potential
antimicrobia...
Biocontrol ability and volatile organic compounds production as a putative mode of action of yeast strains isolated from organic grapes and rye grains
Antonie van Leeuwenhoek - Tập 113 - Trang 1135-1146 - 2020
The inhibiting activity of three yeast strains belonging to Pichia kudriavzevii,
Pichia occidentalis, and Meyerozyma quilliermondii/Meyerozyma caribbica genera
against common plant pathogens representing Mucor spp., Penicillium chrysogenum,
Penicillium expansum, Aspergillus flavus, Fusarium cereals, Fusarium poae, as
well as Botrytis cinerea genera was investigated. The yeast strains tested had a
...
Experiments with an apparatus for lyophile desiccation of micro-organisms
Antonie van Leeuwenhoek - Tập 18 - Trang 113-124 - 1952
Lyophyle desiccation is an extremely valuable method of preserving
micro-organisms. The apparatus described above proves satisfactory. The material
should be frozen as rapidly as possible at a temperature of −35°C. or lower, and
the apparatus should be constructed in such a way that the pressure remains
approximatively constant. During the sealing of the ampoules care should be
taken that no dry m...
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