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Twisk, J. (author), Lehmann, E.M. (author), Princen, H.M.G. (author), Instituut voor verouderings- en vaatziekten onderzoek TNO (author)We have used primary monolayer cultures of rat hepatocytes to study the effects of physiological concentrations of various bile acids, commonly found in bile of normal rats, on the mechanism of regulation of cholesterol 7α-hydroxylase and bile acid synthesis. Addition of taurocholic acid, the most predominant bile acid in rat bile, to the...article 1993
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Wang, M. (author), Sedee, N.J.A. (author), Heidekamp, F. (author), Snaar-Jagalska, B.E. (author)We report the existence of several families of GTP-binding proteins in barley aleurone protoplasts. Partial purified plasma membrane proteins were separated by SDS-PAGE, transferred to a nitrocellulose filter and incubated with either antisera raised against a highly conserved animal G protein alpha subunit peptide/or Ras protein, or with [alpha...article 1993
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Medisch Biologisch Laboratorium TNO (author), Verdoes, J.C. (author), Punt, P.J. (author), Schrickx, J.M. (author), van Verseveld, H.W. (author), Stouthamer, A.H. (author), van den Hondel, C.A.M.J.J. (author)A strategy, based on the usage of the amdS selection marker and a cosmid vector containing four copies of the glucoamylase gene (glaA), was developed to obtain glucoamylase (GLA)-overproducing A. niger strains. With this strategy, fungal strains carrying up to 200 copies of the glaA gene could be isolated at a relatively high frequency. In each...article 1993
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Instituut voor Verouderings- en Vaatziekten Onderzoek TNO (author), HogenEsch, H. (author), de Geus, B. (author), Tielen, F. (author), Rozing, J. (author)We investigated the expression of Ly-6.A2 on isolated murine epidermal cells by flow cytometry. Ly-6.A2 was expressed on 61% of keratinocytes and 6% of dendritic epidermal T cells of C57BL mice. Phosphatidylinositol-specific phospholipase C removed Ly-6.A2, indicating that the antigen is anchored to the keratinocyte membrane via a glycosyl...article 1993
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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
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Havenith, G. (author), van de Linde, E.J.G. (author), Heus, R. (author)Hand cooling and resulting comfort and pain were studied in 12 subjects, while touching six different materials (polyurethane foam, wood, nylon, rustproof steel, aluminium, and temperature-controlled metal) which were initially at ambient temperature. This was done for three ambient temperatures (-10°, 0° and 10°C), after pre-exposure exercise...article 1992
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Lotens, W.A. (author)A simple analytical model has been developed to simulate the cooling of the hands due to touching various types of cold material. The model consisted of a slab of tissue, covered on both sides with skin. The only active mechanism was the skin blood flow. The blood flow was controlled by body core temperature, mean skin temperature, and local...article 1992
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Punt, P.J. (author), Kramer, C. (author), Kuyvenhoven, A. (author), Pouwels, P.H. (author), van den Hondel, C.A.M.J.J. (author), Medisch Biologisch Laboratorium TNO (author)Introduction of a previously identified promoter element of the Aspergillus nidulans gpdA gene (encoding glyceraldehyde-3-phosphate dehydrogenase), the so-called gpd box, into the upstream region of the highly regulated A. nidulans amdS gene (encoding acetamidase), significantly increased (up to 30-fold) the expression of the lacZ reporter gene...article 1992
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van den Eertwegh, A.J.M. (author), Boersma, W.J.A. (author), Claassen, E. (author), Medisch Biologisch Laboratorium TNO (author)The spleen is an important lymphoid organ, involved in immune responses against all types of antigen that appear in the circulation. Its complex anatomical organization, with distinct compartments containing specialized cell types, provides a microenvironment which allows different cell-cell interactions and determines the direction of...article 1992
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Hensgens, L.A.M. (author), Fornerod, M.W.J. (author), Rueb, S. (author), Winkler, A.A. (author), van der Veen, S. (author), Schilperoort, R.A. (author), Centrum voor Plantenfysiologisch Onderzoek (author)Transcriptional and translational fusions between the reading frame of the β-D-glucuronidase gene (gusA) and the 2′ as well as the 1′ promoter of mannopine synthase (mas), a TR locus of Agrobacterium tumefaciens, were made. The expression of these constructs was studied in the transgenic F1 offspring of independent tobacco transformants at the...article 1992
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TNO Preventie en Gezondheid (author)De lezingen van het Lustrum-symposium van de NVVK op 11 en 12 november 1992 zijn gebundeld en uitgegeven. Het symposium had vier thema's: arbozorg: beleid en praktijk; veiligheid in de gezondheidszorg; veiligheid in de chemische industrie; en implementatie van de EEG-kaderrichtlijn in de Arbowet. Er zijn bijdragen over: het combineren van...book 1992
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Daanen, H.A.M. (author), van de Linde, F.J.G. (author)Four noninvasive rewarming techniques for mildly hypothermic subjects were compared. Seven subjects were cooled in a water bath of 15°C for 2 h to an average esophageal temperature (Tes) of 36°C. Thereafter, the subjects were rewarmed by immersion of the body in a water bath of 42°C (Method 1), the body but not the extremities in water of 42°C ...article 1992
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Punt, P.J. (author), Zegers, N.D. (author), Busscher, M. (author), Pouwels, P.H. (author), van den Hondel, C.A.M.J.J. (author), Medisch Biologisch Laboratorium TNO (author)The expression in Aspergillus is described of genes, coding for intracellular and extracellular proteins controlled by the promoter region of the constitutively and efficiently expressed glyceraldehyde-3-phosphate dehydrogenase gene (gpdA) of Aspergillus nidulans. Both the homologous gpdA and the heterologous Escherichia coli β-galactosidase ...article 1991
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van Hinsbergh, V.W.M. (author), van den Berg, E.A. (author), Fiers, W. (author), Dooijewaard, G. (author), Gaubius Instituut TNO (author)Endothelial cells play an important role in the regulation of fibrinolysis by the production of several key regulatory proteins. The cytokines tumor necrosis factor (TNF), lymphotoxin, and interleukin-1 (IL-1), but not interleukin-6, increase the production of plasminogen activator inhibitor-1 (PAI-1) by endothelial cells, whereas they have no...article 1990
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Havenith, G. (author), van Middendorp, H. (author)An experiment was set up to quantify the relative influence of fitness, acclimatization, gender and anthropometric measures on physiological responses to heat stress. For this purpose, 12 male and 12 female subjects were exposed to a neutral [ambient temperature (T(a)) 21°C, relative humidity (r.h. 50%)], a warm, humid (T(a) 34°C, r.h. 80%) and...article 1990
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Medisch Biologisch Laboratorium TNO (author), Punt, P.J. (author), Dingemanse, M.A. (author), Kuyvenhoven, A. (author), Soede, R.D.M. (author), Pouvels, P.H. (author), van den Hondel, C.A.M.J.J. (author)Analysis of the promoter region of the highly expressed Aspergillus nidulans gpdA gene is described. The nucleotide (nt) sequence of a 1.3-kb region upstream from the ATG was determined. Comparison with promoter regions of other Aspergillus and Neurospora genes revealed several regions similar sequence. Both random and site-specific mutations...article 1990
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van Gorcom, R.F.M. (author), Boschloo, J.G. (author), Kuijvenhoven, A. (author), Lange, J. (author), van Vark, A.J. (author), Bos, C.J. (author), van Balken, J.A.M. (author), Pouwels, P.H. (author), van den Hondel, C.A.M.J.J. (author)The gene coding for benzoate-para-hydroxylase (bphA) of Aspergillus niger was cloned using differential hybridisation techniques and complementation of mutants deficient in this enzyme activity. The nucleotide sequence of the gene was determined, the presence of two introns was shown and the transcription start and termination sites were...article 1990
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Gaubius Instituut TNO (author), Princen, H.M.G. (author), Meijer, P. (author), Hofstee, B. (author)To study the effect of steroid hormones on bile acid synthesis by cultured rat hepatocytes, cells were incubated with various amounts of these compounds during 72 h and conversion of [4-14C]cholesterol into bile acids was measured. Bile acid synthesis was stimulated in a dose-dependent way by glucocorticoids, but not by sex steroid hormones,...article 1989
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Instituut voor Zintuigfysiologie TNO (author), Lotens, W.A. (author)The effect of geometric factors on insulation was calculated mathematically for standing humans. It was found that internal radiative heat transfer in an ensemble was significant for insulation, that intrinsic clothing insulation is a useful concept only for indoor climates, and that shape plays a minor role. The literature agrees closely on...article 1989
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van Hinsbergh, V.W.M. (author), Kooistra, T. (author), van den Berg, E.A. (author), Princen, H.M.G. (author), Fiers, W. (author), Emeis, J.J. (author), Gaubius instituut TNO (author)The vascular endothelium plays an important role in fibrinolysis by producing tissue-type plasminogen activator (t-PA) and plasminogen activator inhibitor (PAI). The monokine tumor necrosis factor (human recombinant TNF) increased the production of PAI by cultured human endothelial cells from umbilical vein (twofold) and from foreskin...article 1988