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Affiliation(s)
| | - N. van Uden
- Laboratório de Microbiologia Instituto Gulbenkian de Ciência Oeiras, Portugal
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Niers L, Martín R, Rijkers G, Sengers F, Timmerman H, van Uden N, Smidt H, Kimpen J, Hoekstra M. The effects of selected probiotic strains on the development of eczema (the PandA study). Allergy 2009; 64:1349-58. [PMID: 19392993 DOI: 10.1111/j.1398-9995.2009.02021.x] [Citation(s) in RCA: 174] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Modification of the intestinal microbiota by administration of probiotic bacteria may be a potential approach to prevent allergic disease. We aimed to study primary prevention of allergic disease in high-risk children by pre- and postnatal supplementation of selected probiotic bacteria. METHODS In a double-blind, randomized, placebo-controlled trial, a mixture of probiotic bacteria selected by in-vitro experiments (Bifidobacterium bifidum, Bifidobacterium lactis, and Lactococcus lactis; Ecologic Panda) was prenatally administered to mothers of high-risk children (i.e. positive family history of allergic disease) and to their offspring for the first 12 months of life. RESULTS Parental-reported eczema during the first 3 months of life was significantly lower in the intervention group compared with placebo, 6/50 vs 15/52 (P = 0.035). After 3 months, the incidence of eczema was similar in both groups. Cumulative incidence of parental-reported eczema at 1 and 2 years was 23/50 (intervention) vs 31/48 (placebo) and 27 (intervention) vs 34 (placebo), respectively. The number needed to treat was 5.9 at age 3 and 12 months and 6.7 at age 2 years. The intervention group was significantly more frequently colonized with higher numbers of Lc. lactis. Furthermore, at age 3 months, in vitro production of IL-5 (146 pg/ml vs 72 pg/ml; P = 0.04) was decreased in the probiotic-group compared with the placebo-group. CONCLUSIONS This particular combination of probiotic bacteria shows a preventive effect on the incidence of eczema in high-risk children, which seems to be sustained during the first 2 years of life. In addition to previous studies, the preventive effect appears to be established within the first 3 months of life.
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Affiliation(s)
- L Niers
- Department of Pediatrics, Wilhelmina Children's' Hospital, University Medical Center, Utrecht, the Netherlands
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van Uden N. Exponential cell growth limited by a diffusion-transferred nutrient. J Basic Microbiol 2007. [DOI: 10.1002/jobm.19690090506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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van Uden N, Madeira-Lopes A. Concurrent exponential growth and death of cell populations of Saccharomyces cerevisiae at superoptimal growth temperatures. J Basic Microbiol 2007. [DOI: 10.1002/jobm.19700100708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Madeira-Lopes A, van Uden N. Effects of chloramphenicol on the thermal profile of Saccharomyces cerevisiae. J Basic Microbiol 2007. [DOI: 10.1002/jobm.19810210109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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van Uden N, Cabeça-Silva C, Madeira-Lopes A, Spencer-Martins I. Selective isolation of depressed mutants of an α-amylase yeast by the use of 2-deoxyglucose. Biotechnol Bioeng 2004. [DOI: 10.1002/bit.260220314] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Pinto I, Cardoso H, Leão C, van Uden N. High enthalpy and low enthalpy death inSaccharomyces cerevisiaeinduced by acetic acid. Biotechnol Bioeng 2004; 33:1350-2. [DOI: 10.1002/bit.260331019] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Leão C, van Uden N. Effects of ethanol and other alkanols on the general amino acid permease ofSaccharomyces cerevisiae. Biotechnol Bioeng 2004; 26:403-5. [DOI: 10.1002/bit.260260422] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Hoffer SM, van Uden N, Tommassen J. Expression of the pho regulon interferes with induction of the uhpT gene in Escherichia coli K-12. Arch Microbiol 2001; 176:370-6. [PMID: 11702079 DOI: 10.1007/s002030100339] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2001] [Accepted: 08/08/2001] [Indexed: 10/27/2022]
Abstract
The uptake of hexose 6-phosphates in Escherichia coli is mediated by the transporter UhpT, the synthesis of which is induced by the presence of glucose 6-phosphate (glucose 6-P) in the medium. Since this protein functions as an anion exchanger, it is generally assumed to be geared for the use of sugar phosphates as a carbon source. However, the question was unresolved whether this transporter can also provide the cells with glucose 6-P as a phosphate source. It is demonstrated in this work that UhpT-mediated glucose 6-P uptake does not allow the cells to grow on glucose 6-P as phosphate source. Hence, the expression of UhpT under phosphate limitation would not be particularly advantageous and some form of interaction between the uhp system and the Pi-limitation-inducible pho regulon, the products of which are involved in phosphate acquisition, may be anticipated. Indeed, the use of an uhpT-lacZ fusion revealed that much higher concentrations of the inducer glucose 6-P were required to elevate uhpT transcription when the pho regulon was expressed. This interference was the result of degradation of glucose 6-P by one of the products of the pho regulon, the periplasmic enzyme alkaline phosphatase. The specific form of interaction between the Pho and Uhp systems is designated inducer degradation.
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Affiliation(s)
- S M Hoffer
- Department of Molecular Microbiology, Utrecht University, 3584 CH Utrecht, The Netherlands
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Abstract
Lactic acid-grown cells of a strain of Kluyveromyces marxianus transported D- and L-lactic acid by a saturable mechanism that was partially inducible and subject to glucose repression, with the following kinetic parameters at pH 5.4: Vmax = 1.00 (+/- 0.13) mmol h-1 per g dry weight and Ks = 0.42 (+/- 0.08) mM. Lactic acid transport was competitively inhibited by pyruvic, glycolic, acetic and bromoacetic acids. The latter, a non-metabolizable analogue, was transiently accumulated, the extent depending on the extracellular pH. The pH dependence of the Ks values for undissociated lactic acid and for the lactate anion indicated that the latter was the transported species. Lactate uptake was not accompanied by the simultaneous uptake of protons, potassium ions or sodium ions excluding symport mechanisms. Initial lactic acid uptake led to transient membrane hyperpolarization as measured with a fluorescent dye excluding also an electroneutral anion antiport mechanism. It was concluded that lactate anions use a monocarboxylate uniport and that the counter anion, possibly bicarbonate, uses a separate channel, the coupling being electrical and loose.
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Affiliation(s)
- A Fonseca
- Laboratory of Microbiology, Gulbenkian Institute of Science, Oeiras, Portugal
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Abstract
A novel species of the basidiomycetous genus Cryptococcus is described as Cr. yarrowii based on the study of an isolate from a decayed mushroom collected in Portugal. DNA-DNA homology with the type strain of the phenotypically similar species Cr. albidus was 10 +/- 2%.
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Affiliation(s)
- A Fonseca
- Portuguese Yeast Culture Collection, Laboratory of Microbiology, Gulbenkian Institute of Science, Oeiras
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Henriques M, Sá-Nogueira I, Giménez-Jurado G, van Uden N. Ribosomal DNA spacer probes for yeast identification: studies in the genus Metschnikowia. Yeast 1991; 7:167-72. [PMID: 2063626 DOI: 10.1002/yea.320070210] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
To test whether DNA probes derived from ribosomal DNA spacer sequences are suitable for rapid and species-specific yeast identification, a pilot study was undertaken. A 7.7 kb entire ribosomal DNA unit of the type strain of Metschnikowia reukaufii was isolated, cloned and mapped. A 0.65 kb BamHI-HpaI fragment containing non-transcribed spacer sequences was amplified and selected for testing as a 32P hybridization probe with total DNA from the type strains of M. reukaufii, M. pulcherrima, M. lunata, M. bicuspidata, M. australis, M. zobellii, M. krissii, five other strains identified as M. reukaufii and strains of Schizosaccharomyces pombe, Hansenula canadensis, Saccharomyces cerevisiae and Yarrowia lipolytica. The probe hybridized exclusively with DNA from the type strain and four other strains of M. reukaufii. DNA from one strain labelled M. reukaufii did not hybridize with the probe. Subsequent % G + C comparison and DNA-DNA reassociation with the type strain revealed that the non-hybridizing strain does not belong to the species M. reukaufii.
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Affiliation(s)
- M Henriques
- Laboratory of Microbiology, Gulbenkian Institute of Science, Oeiras, Portugal
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Giménez-Jurado G, Plácido T, Cidadão AJ, Cabeça-Silva C, Fonseca E, Roeijmans HJ, van Eijk GW, van Uden N. Kurtzmanomyces tardus sp. nov., a new anamorphic yeast species of basidiomycetous affinity. Antonie Van Leeuwenhoek 1990; 58:129-35. [PMID: 2264723 DOI: 10.1007/bf00422729] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A new yeast species of basidiomycetous affinity Kurtzmanomyces tardus was isolated from contaminated demineralized water. It differs from K. nectairii, the only other Kurtzmanomyces species so far described, in its carbon assimilation pattern and low DNA-DNA homology (2.3% +/- 2.1).
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Affiliation(s)
- G Giménez-Jurado
- Laboratory of Microbiology, Gulbenkian Institute of Science, Oeiras, Portugal
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Côrte-Real M, Leão C, van Uden N. Transport of l(-)malic acid and other dicarboxylic acids in the yeast Candida sphaerica. Appl Microbiol Biotechnol 1989. [DOI: 10.1007/bf00270793] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
During starvation (derepression) glucose-grown cells of Candida shehatae IGC 3607 displayed total interconversion of facilitated diffusion of glucose into a glucose-proton symport, dependent on de novo protein synthesis (proteosynthetic interconversion). The reverse process, inactivation of the proton symport induced by glucose or 2-deoxyglucose, was not accompanied by reemergence of the facilitated diffusion function. The inactivation process had a rapid initial and a slow second phase. The rapid inactivation depended on the external sugar concentration and was reversible while the subsequent slow inactivation was irreversible and independent of the external concentration of the signalling sugar. Interaction of the latter with a surface receptor was indicated by the range of sugar concentrations that affected rapid inactivation.
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Affiliation(s)
- C Lucas
- Laboratory of Microbiology, Gulbenkian Institute of Science, Oeiras, Portugal
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Cason DT, Spencer-Martins I, van Uden N. The kinetics of fructose utilization byS. cerevisiae IGC 4261 in sucrose adjunct brewers wort fermentations. Biotechnol Lett 1987. [DOI: 10.1007/bf01028283] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cássio F, Leão C, van Uden N. Transport of lactate and other short-chain monocarboxylates in the yeast Saccharomyces cerevisiae. Appl Environ Microbiol 1987; 53:509-13. [PMID: 3034152 PMCID: PMC203697 DOI: 10.1128/aem.53.3.509-513.1987] [Citation(s) in RCA: 127] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Saccharomyces cerevisiae IGC4072 grown in lactic acid medium transported lactate by an accumulative electroneutral proton-lactate symport with a proton-lactate stoichiometry of 1:1. The accumulation ratio measured with propionate increased with decreasing pH from ca. 24-fold at pH 6.0 to ca. 1,400-fold at pH 3.0. The symport accepted the following monocarboxylates (Km values at 25 degrees C and pH 5.5): D-lactate (0.13 mM), L-lactate (0.13 mM), pyruvate (0.34 mM), propionate (0.09 mM), and acetate (0.05 mM), whereas apparently a different proton symport accepted formate (0.13 mM). The lactate system was inducible and was subject to glucose repression. Undissociated lactic acid entered the cells by simple diffusion. The permeability of the plasma membrane for undissociated lactic acid increased exponentially with pH, and the diffusion constant increased 40-fold when the pH was increased from 3.0 to 6.0.
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Spencer-Martins I, van Uden N. Substrate and endproduct regulation of cellobiose uptake by Candida wickerhamii. Appl Microbiol Biotechnol 1986. [DOI: 10.1007/bf00253662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Loureiro V, van Uden N. Roles of the specific growth rate and the ethanol concentration in the adaptation ofSaccharomyces cerevisiae to ethanol. Biotechnol Bioeng 1986; 28:1443-5. [DOI: 10.1002/bit.260280919] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Leão C, van Uden N. Effects of ethanol and other alkanols on the temperature relations of glucose transport and fermentation inSaccharomyces cerevisiae. Appl Microbiol Biotechnol 1985. [DOI: 10.1007/bf00582420] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Laires A, Spencer-Martins I, van Uden N. Use of D-glucosamine and 2-deoxyglucose in the selective isolation of mutants of the yeastLipomyces starkeyi derepressed for the production of extracellular endodextranase. ACTA ACUST UNITED AC 1983. [DOI: 10.1002/jobm.3630230918] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Sá-Correia I, van Uden N. Effects of ethanol on thermal death and on the maximum temperature for growth of the yeast Kluiveromyces fragilis. Biotechnol Lett 1982. [DOI: 10.1007/bf00131157] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Anacleto J, van Uden N. Kinetics and activation energetics of death inSaccharomyces cerevisiae induced by sulfur dioxide. Biotechnol Bioeng 1982; 24:2477-86. [DOI: 10.1002/bit.260241112] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Le?o C, van Uden N. Effects of ethanol and other alkanols on the glucose transport system ofSaccharomyces cerevisiae. Biotechnol Bioeng 1982; 24:2601-4. [DOI: 10.1002/bit.260241124] [Citation(s) in RCA: 94] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Vidal-Leiria M, Buckley H, van Uden N. Distribution of the maximum temperature for growth among yeasts. Mycologia 1979; 71:493-501. [PMID: 574189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Simões-Mendes B, Madeira-Lopes A, van Uden N. Kinetics of petite mutation and thermal death in Saccharomyces cerevisiae growing at superoptimal temperatures. Z Allg Mikrobiol 1978; 18:275-9. [PMID: 354226 DOI: 10.1002/jobm.3630180406] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Mass formation of petite mutants took place in a strain of Saccharomyces cerevisiae when grown at superoptimal temperatures. After an initial period of exponential growth, a second period followed during which exponential death and net exponential petite mutation concurred with exponential growth. The specific rates of the three exponential processes were of the same order of magnitude and varied with the temperature. Net exponential petite mutation did not occur during the deathless first period of growth at superoptimal temperatures nor at any time during growth at suboptimal temperatures. Mitochondria are discussed as possible targets of thermal death in mesophilic yeasts.
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van Uden N, Abranches P, Cabeça-Silva C. Temperature functions of thermal death in yeasts and their relation to the maximum temperature for growth. Arch Mikrobiol 1968; 61:381-93. [PMID: 5715635 DOI: 10.1007/bf00409674] [Citation(s) in RCA: 50] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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do Carmo-Sousa L, van Uden N. Reisolation of Sarcinomyces inkin and its transfer to the genus Trichosporon. Mycologia 1967; 59:653-7. [PMID: 6068728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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van Uden N. Transport-limited fermentation and growth of saccharomyces cerevisiae and its competitive inhibition. Arch Mikrobiol 1967; 58:155-68. [PMID: 5600788 DOI: 10.1007/bf00406676] [Citation(s) in RCA: 118] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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van Uden N. Transport-limited growth in the chemostat and its competitive inhibition; a theoretical treatment. Arch Mikrobiol 1967; 58:145-54. [PMID: 4878543 DOI: 10.1007/bf00406675] [Citation(s) in RCA: 52] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Buckley HR, van Uden N. The identification of Candida albicanswithin two hours by the use of an egg white slide preparation. Med Mycol 1963. [DOI: 10.1080/00362176385190351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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