Pages
- 1
- 2
- document
-
van Duuren, J.B.J.H. (author), Wijte, D. (author), Leprince, A. (author), Karge, B. (author), Puchalka, J. (author), Wery, J. (author), Dos Santos, V.A.P.M. (author), Eggink, G. (author), Mars, A.E. (author)Pseudomonas putida KT2440-JD1 was derived from P. putida KT2440 after N-methyl-N'-nitro-N-nitrosoguanidine (NTG)-mutagenesis and exposure to 3-fluorobenzoate (3-FB). The mutant was no longer able to grow using benzoate as a sole carbon source, but co-metabolized benzoate to cis, cis-muconate during growth on glucose, which accumulated in the...article 2011
- document
-
Meijnen, J.P. (author), de Winde, J.H. (author), Ruijssenaars, H.J. (author)The oxidative D-xylose catabolic pathway of Caulobacter crescentus, encoded by the xylXABCD operon, was expressed in the gram-negative bacterium Pseudomonas putida S12. This engineered transformant strain was able to grow on D-xylose as a sole carbon source with a biomass yield of 53% (based on g [dry weight] g D-xylose-1) and a maximum growth...article 2009
- document
-
TNO-Quality of Life, Business Unit Food and Biotechnology Innovations (author), Meijnen, J.P. (author), Winde, J.H.de (author), Ruijssenaars, H.J. (author)The oxidative D-xylose catabolic pathway of Caulobacter crescentus, encoded by the xylXABCD operon, was expressed in the gram-negative bacterium Pseudomonas putida S12. This engineered transformant strain was able to grow on D-xylose as a sole carbon source with a biomass yield of 53% (based on g [dry weight] g D-xylose-1) and a maximum growth...article 2009
- document
-
Pieterse, B. (author), Jellema, R.H. (author), van der Werf, M.J. (author), TNO Kwaliteit van Leven (author)Messenger RNA levels change on a minutes scale due to both degradation and de novo transcription. Consequently, alterations in the transcript profiles that are not representative for the condition of interest are easily introduced during sample harvesting and work-up. In order to avoid these unwanted changes we have validated a - 45°C methanol...article 2006
- document
-
Kappers, W.A. (author), van Och, F.M.M. (author), de Groene, E.M. (author), Horbach, G.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Three different in vitro mutation assays were used to investigate the involvement of cytochrome P450 enzymes in the activation of the nitro- polycyclic aromatic hydrocarbons (nitroPAHs) 1-nitropyrene and 2- nitrofluorene and their reduced metabolites amino-polycyclic aromatic hydrocarbons (aminoPAHs) 1-aminopyrene and 2-aminofluorene....article 2000
- document
-
Martínez, B. (author), Fernández, M. (author), Suárez, J.E. (author), Rodríguez, A. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Synthesis of lactococcin 972 is plasmid-encoded. An operon composed of two genes that encode pre-bacteriocin and a putative immunity protein has been identified. The first gene encodes a 91-residue polypeptide that is exported via a sec-dependent system to give the mature 66-aa bacteriocin. The immunity protein is a 563-residue polypeptide with...article 1999
- document
-
Induction of somatic mutations but not methylated DNA adducts in λlacZ transgenic mice by dichlorvosPletsa, V. (author), Steenwinkel, M.-J.S.T. (author), van Delft, J.H.M. (author), Baan, R.A. (author), Kyrtopoulos, S.A. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)In order to examine the in vivo genotoxic activity of dichlorvos, λlacZ transgenic mice (Muta(TM)Mouse) were treated i.p. with single (4.4 or 11 mg/kg) or multiple (5x11 mg/kg) doses of this agent and sacrificed 4 h or 14 days post-treatment for DNA adduct measurement or mutant frequency analysis, respectively. Neither methylated DNA adducts nor...article 1999
- document
-
Pletsa, V. (author), Steenwinkel, M.-J.S.T. (author), van Delft, J.H.M. (author), Baan, R.A. (author), Kyrtopoulos, S.A. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Following single or multiple oral treatments of rats or λlacZ transgenic mice with methyl bromide, methylated DNA adducts (N7- and/or O6-methylguanine) were found at comparable levels in various tissues, including among others the glandular stomach, the forestomach and the liver. Multiple rat treatment resulted in substantial decreases in the...article 1998
- document
-
Souliotis, V.L. (author), van Delft, J.H.M. (author), Steenwinkel, M.-J.S.T. (author), Baan, R.A. (author), Kyrtopoulos, S.A. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)Groups of λlacZ transgenic mice were treated i.p. with N-nitrosodimethylamine (NDMA) as single doses of 5 mg/kg or 10 mg/kg or as 10 daily doses of 1 mg/kg and changes in DNA N7- or O6-methylguanine or the repair enzyme O6-alkylguanine-DNA alkyltransferase (AGT) were followed for up to 14 days in various tissues. Adduct induction in the liver...article 1998
- document
-
Chaillou, S. (author), Postma, P.W. (author), Pouwels, P.H. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)The xylP gene of Lactobacillus pentosus, the first gene of the xylPQR operon, was recently found to be involved in isoprimeverose metabolism. By expression of xylP on a multicopy plasmid in Lactobacillus plantarum 80, a strain which lacks active isoprimeverose and D-xylose transport activities, it was shown that xylP encodes a transporter....article 1998
- document
-
Chaillou, S. (author), Bor, Y.-C. (author), Batt, C.A. (author), Postma, P.W. (author), Pouwels, P.H. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)A 3-kb region, located downstream of the Lactobacillus brevis xylA gene (encoding D-xylose isomerase), was cloned in Escherichia coli TG1. The sequence revealed two open reading frames which could code for the D-xylulose kinase gene (xylB) and another gene (xylT) encoding a protein of 457 amino acids with significant similarity to the D-xylose-H...article 1998
- document
-
Mientjes, E.J. (author), Luiten-Schuite, A. (author), van der Wolf, E. (author), Borsboom, Y. (author), Bergmans, A. (author), Berends, F. (author), Lohman, P.H.M. (author), Baan, R.A. (author), van Delft, J.H.M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)To investigate tissue-specific relations between DNA adducts and mutagenesis in vivo, λlacZ transgenic mice were treated i.p. with N-ethyl-N-nitrosourea (ENU), diethylnitrosamine (DEN), and ethyl methanesulphonate (EMS). In liver, bone marrow, and brain DNA from mice sacrificed at several time points after treatment O6-ethylguanine (O6-EtG) and...article 1998
- document
-
Chaillou, S. (author), Lokman, B.C. (author), Leer, R.J. (author), Posthuma, C. (author), Postma, P.W. (author), Pouwels, P.H. (author)Two genes, xylP and xylQ, from the xylose regulon of Lactobacillus pentosus were cloned and sequenced. Together with the repressor gene of the regulon, xylR, the xylPQ genes form an operon which is inducible by xylose and which is transcribed from a promoter located 145 bp upstream of xylP. A putative xylR binding site (xylO) and a cre-like...article 1998
- document
-
van Delft, J.H.M. (author), Bergmans, A. (author), van Dam, F.J. (author), Tates, A.D. (author), Howard, L. (author), Winton, D.J. (author), Baan, R.A. (author)Comparison of results derived from transgenic animal gene-mutation assays with those from mutation analyses in endogenous genes is an important step in the validation of the former. We have used λlacZ transgenic mice to study alkylation-induced mutagenesis in vivo in (a) lacZ and hprt in spleen cells, and (b) lacZ and Dlb-1 in small intestine...article 1998
- document
-
Frijhoff, A.F.W. (author), Krul, C.A.M. (author), de Vries, A. (author), Kelders, M.C.J.M. (author), Weeda, G. (author), van Steeg, H. (author), Baan, R.A. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)To study the influence of nucleotide excision repair (NER) on mutagenesis in vivo, ERCC1+/-, XPA-/-, and wild-type (ERCC1+/+ and XPA+/+, respectively) λlacZ-transgenic mice were treated i.p. with N-hydroxy-2-acetylaminofluorene (N-OH-AAF) and lacZ mutant frequencies were determined in liver. No significant effect of the treatment on the mutant...article 1998
- document
-
Rompelberg, C.J.M. (author), Steenwinkel, M.J.S.T. (author), van Asten, J.G. (author), van Delft, J.H.M. (author), Baan, R.A. (author), Verhagen, H. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)To study the possible reduction by eugenol of the mutagenicity and genotoxicity of benzoja]pyrene (B[a]P) in vivo, the X-lacZ-transgenic mouse strain 40.6 (Muta(TM)Mouse) was used. Male mice were fed a diet containing 0.4% (w/w) eugenol or a control diet for 58 days. On day 10, half of the mice received an i.p. dose of 100 mg/kg b.w. B[a]P. The...article 1996
- document
-
Mientjes, E.J. (author), Hochleitner, K. (author), Luiten-Schuite, A. (author), van Delft, J.H.M. (author), Thomale, J. (author), Berends, F. (author), Rajewsky, M.F. (author), Lohman, P.H.M. (author), Baan, R.A. (author), TNO Voeding (author)LacZ transgenic mice are suitable for short-term mutagenicity studies in vivo. Mutagenicity in these mice is determined in the lacZ transgene. Since the lacZ gene is of bacterial origin the question has been raised whether DNA-adduct formation and repair in the transgene are comparable to those in total genomic DNA. Mice were treated with N...article 1996
- document
-
van Delft, J.H.M. (author), Baan, R.A. (author), Instituut CIVO-Toxicologie en Voeding TNO (author)Germ cell mutagenesis was studied in male λlacZ transgenic mice in such a way that the data can be compared with literature data for germ cell mutagenesis obtained with the specific-locus test. This comparison is of interest for validation of the transgenic mouse model. We studied mutagenesis induced by ethylnitrosourea (ENU) in mature...article 1995
- document
-
van Oers, M.M. (author), Malarme, D. (author), Jore, J.P.M. (author), Vlak, J.M. (author), Medisch Biologisch Laboratorium TNO (author)Two major late proteins, polyhedrin and p10, are synthesized in large quantities in baculovirus infected insect cells. This and the fact that both proteins are dispensable for virus replication, form the basis for the use of these viruses as vector for foreign gene expression. To address the question whether the Autographa californica nuclear...article 1992
- document
-
Enger-Valk, B.E. (author), van Rotterdam, J. (author), Pouwels, P.H. (author), Medisch Biologisch Laboratorium TNO (author)Chemicals/CAS: DNA Restriction Enzymes, EC 3.1.21; DNA, Recombinant; Plasmids; Tryptophan, 73-22-3article 1981
Pages
- 1
- 2