Records 1 - 20 / 269
|Hitte in kleine kernen
Terpstra, T. ; Tonkes, M. ; Jacobs, C.M.J. - \ 2019
ROM Magazine 2019 (2019)9. - ISSN 1380-7153
Impact of cleanliness on the productivity of employees
Horrevorts, Mirte ; Ophem, Johan Van; Terpstra, Paul - \ 2018
Facilities 36 (2018)9-10. - ISSN 0263-2772 - p. 442 - 459.
Clean environment - Cleanliness - Employees - Not-for-profit organizations - Perceived productivity - Work satisfaction
Purpose: The purpose of this paper is to investigate whether the cleanliness of a work environment has influence on the productivity of employees working in office environments of non-profit organizations in The Netherlands. Design/methodology/approach: In the study, an online survey (including questions about the perceived cleanliness) and two objective cleanliness assessment methods (particle counts and surface cleanliness) are used. The data are collected using an online questionnaire to determine the workers’ perception (of productivity and cleanliness) and to measure the cleanliness (visual assessment of the surface cleanliness and measured [dust] particle counts in the ambient air) at five different non-profit organizations in The Netherlands. Findings: It is found that a higher objective cleanliness correlates significantly with a higher perceived productivity of employees working in office environments of non-profit organizations in The Netherlands. A higher measured cleanliness also correlates significantly with a higher work satisfaction level of employees working in office environments. Finally, a significant correlation is found between the satisfaction of employees with their work as a whole and the perceived productivity of the employees; a higher satisfaction leads to a higher perceived productivity. Research limitations/implications: The cleanliness is measured in five non-profit organizations, so it is not possible to draw any strong generalization. Future studies are needed to confirm or contradict the findings in this research. Practical implications: The results highlight the aspects of the cleanliness in the office environment that influence the perceived productivity. This concerns the measured cleanliness. Employees evaluate their own productivity lower at a higher level of particle counts in the ambient air in the office environment and when more dirt and stain are found on the surface (lower surface cleanliness). In response to these findings, it is recommended to carry out regular cleaning activities in the office environment where the employees perform their work. Overall, to maintain or achieve maximum personal productivity, a clean office environment is important. Originality/value: This research is the first to identify the relationship between perceived productivity and measured cleanliness of the office environment.
|Fermenteren: oma's keukentechniek is terug
Smid, Eddy - \ 2017
Fermenteren, een oude techniek om groenten langer te bewaren, is terug. Zelf zuurkool, yoghurt, augurken, kimchi of chutneys maken is eenvoudig, gezond en een energiezuinige oplossing tegen voedselverspilling.
|Alle vis moet aan wal
Steins, Nathalie - \ 2017
The PLETHORA Gene Regulatory Network Guides Growth and Cell Differentiation in Arabidopsis Roots
Santuari, Luca ; Sanchez-Perez, Gabino F. ; Luijten, Marijn ; Rutjens, Bas ; Terpstra, Inez ; Berke, Lidija ; Gorte, Maartje ; Prasad, Kalika ; Bao, Dongping ; Timmermans-Hereijgers, Johanna L.P.M. ; Maeo, Kenichiro ; Nakamura, Kenzo ; Shimotohno, Akie ; Pencik, Ales ; Novak, Ondrej ; Ljung, Karin ; Heesch, Sebastiaan Van; Bruijn, Ewart De; Cuppen, Edwin ; Willemsen, Viola ; Mähönen, Ari Pekka ; Lukowitz, Wolfgang ; Snel, Berend ; Ridder, Dick De; Scheres, Ben ; Heidstra, Renze - \ 2016
The Plant Cell 28 (2016)12. - ISSN 1040-4651 - p. 2937 - 2951.
Organ formation in animals and plants relies on precise control of cell state transitions to turn stem cell daughters into fully differentiated cells. In plants, cells cannot rearrange due to shared cell walls. Thus, differentiation progression and the accompanying cell expansion must be tightly coordinated across tissues. PLETHORA (PLT) transcription factor gradients are unique in their ability to guide the progression of cell differentiation at different positions in the growing Arabidopsis thaliana root, which contrasts with well-described transcription factor gradients in animals specifying distinct cell fates within an essentially static context. To understand the output of the PLT gradient, we studied the gene set transcriptionally controlled by PLTs. Our work reveals how the PLT gradient can regulate cell state by region-specific induction of cell proliferation genes and repression of differentiation. Moreover, PLT targets include major patterning genes and autoregulatory feedback components, enforcing their role as master regulators of organ development.
PPP1, a plant-specific regulator of transcription controls Arabidopsis development and PIN expression
Benjamins, René ; Barbez, Elke ; Ortbauer, Martina ; Terpstra, Inez ; Lucyshyn, Doris ; Moulinier-Anzola, Jeanette ; Khan, Muhammad Asaf ; Leitner, Johannes ; Malenica, Nenad ; Butt, Haroon ; Korbei, Barbara ; Scheres, Ben ; Kleine-Vehn, Jürgen ; Luschnig, Christian - \ 2016
Scientific Reports 6 (2016). - ISSN 2045-2322
Directional transport of auxin is essential for plant development, with PIN auxin transport proteins representing an integral part of the machinery that controls hormone distribution. However, unlike the rapidly emerging framework of molecular determinants regulating PIN protein abundance and subcellular localization, insights into mechanisms controlling PIN transcription are still limited. Here we describe PIN2 PROMOTER BINDING PROTEIN 1 (PPP1), an evolutionary conserved plant-specific DNA binding protein that acts on transcription of PIN genes. Consistent with PPP1 DNA-binding activity, PPP1 reporter proteins are nuclear localized and analysis of PPP1 null alleles and knockdown lines indicated a function as a positive regulator of PIN expression. Furthermore, we show that ppp1 pleiotropic mutant phenotypes are partially reverted by PIN overexpression, and results are presented that underline a role of PPP1-PIN promoter interaction in PIN expression control. Collectively, our findings identify an elementary, thus far unknown, plant-specific DNA-binding protein required for post-embryonic plant development, in general, and correct expression of PIN genes, in particular.
A SCARECROW-based regulatory circuit controls Arabidopsis thaliana meristem size from the root endodermis
Moubayidin, Laila ; Salvi, Elena ; Giustini, Leonardo ; Terpstra, Inez ; Heidstra, Renze ; Costantino, Paolo ; Sabatini, Sabrina - \ 2016
Planta (2016). - ISSN 0032-0935 - p. 1159 - 1168.
ARABIDOPSIS RESPONSE REGULATOR 1 (ARR1) - Differentiation - Gibberellin - Hormones - Root - SCARECROW (SCR)
Main conclusion: SCARECROW controls Arabidopsis root meristem size from the root endodermis tissue by regulating the DELLA protein RGA that in turn mediates the regulation ofARR1levels at the transition zone.Coherent organ growth requires a fine balance between cell division and cell differentiation. Intriguingly, plants continuously develop organs post-embryonically thanks to the activity of meristems that allow growth and environmental plasticity. In Arabidopsis thaliana, continued root growth is assured when division of the distal stem cell and their daughters is balanced with cell differentiation at the meristematic transition zone (TZ). We have previously shown that at the TZ, the cytokinin-dependent transcription factor ARR1 controls the rate of differentiation commitment of meristematic cells and that its activities are coordinated with those of the distal stem cells by the gene SCARECROW (SCR). In the stem cell organizer (the quiescent center, QC), SCR directly suppresses ARR1 both sustaining stem cell activities and titrating non-autonomously the ARR1 transcript levels at the TZ via auxin. Here, we show that SCR also exerts a fine control on ARR1 levels at the TZ from the endodermis by sustaining gibberellin signals. From the endodermis, SCR controls the RGA REPRESSOR OF ga1-3 (RGA) DELLA protein stability throughout the root meristem, thus controlling ARR1 transcriptional activation at the TZ. This guarantees robustness and fineness to the control of ARR1 levels necessary to balance cell division to cell differentiation in sustaining coherent root growth. Therefore, this work advances the state of the art in the field of root meristem development by integrating the activity of three hormones, auxin, gibberellin, and cytokinin, under the control of different tissue-specific activities of a single root key regulator, SCR.
SCARECROW-LIKE23 and SCARECROW jointly specify endodermal cell fate but distinctly control SHORT-ROOT movement
Long, Yuchen ; Goedhart, Joachim ; Schneijderberg, Martinus ; Terpstra, Inez ; Shimotohno, Akie ; Bouchet, Benjamin P. ; Akhmanova, Anna ; Gadella, Theodorus W.J. ; Heidstra, Renze ; Scheres, Ben ; Blilou, Ikram - \ 2015
The Plant Journal 84 (2015)4. - ISSN 0960-7412 - p. 773 - 784.
Arabidopsis thaliana - endodermal fate - intercellular movement - mobile protein - protein interaction - SCL23 - SCR-SHR complex
Intercellular signaling through trafficking of regulatory proteins is a widespread phenomenon in plants and can deliver positional information for the determination of cell fate. In the Arabidopsis root meristem, the cell fate determinant SHORT-ROOT (SHR), a GRAS domain transcription factor, acts as a signaling molecule from the stele to the adjacent layer to specify endodermal cell fate. Upon exiting the stele, SHR activates another GRAS domain transcription factor, SCARCROW (SCR), which, together with several BIRD/INDETERMINATE DOMAIN proteins, restricts movement of SHR to define a single cell layer of endodermis. Here we report that endodermal cell fate also requires the joint activity of both SCR and its closest homologue SCARECROW-LIKE23 (SCL23). We show that SCL23 protein moves with zonation-dependent directionality. Within the meristem, SCL23 exhibits short-ranged movement from ground tissue to vasculature. Away from the meristem, SCL23 displays long-range rootward movement into meristematic vasculature and a bidirectional radial spread, respectively. As a known target of SHR and SCR, SCL23 also interacts with SCR and SHR and can restrict intercellular outspread of SHR without relying on nuclear retention as SCR does. Collectively, our data show that SCL23 is a mobile protein that controls movement of SHR and acts redundantly with SCR to specify endodermal fate in the root meristem. Significance Statement In plants, cell-cell trafficking of transcription factors is widely used for intercellular communication during cell fate specification. Here we show that SCARECROW-LIKE 23 (SCL23) is an additional component of the SCARECROW-SHORT-ROOT(SCR-SHR) complex that can traffic between cell layers, restricting SHR spread and redundantly specifying endodermal fate with its closest homologue SCR.
Monitoring the effect of cat removal on reproductive success in Red-billed Tropicbird colonies on Saba, 2013 - 2014: first season of results
Terpstra, M. ; Woude, E. van der; Wulf, K. ; Rijn, J. van; Debrot, A.O. - \ 2015
Den Helder : IMARES (Report / IMARES C103/15) - 32
animal welfare - wild animals - birds - cats - animal health - saba - feral cats - dierenwelzijn - wilde dieren - vogels - katten - diergezondheid - saba - verwilderde katten
One of the most deleterious invasive introduced predators worldwide is the domestic cat which has been found responsible for many island extinctions worldwide. Cats can live off both natural prey and garbage and can be a particularly serious threat to ground-nesting bird populations. Saba is an important location for the Red-billed Tropicbird, Phaethon aethereus and feral cats are thought to be the main reason for the low breeding success in the southern coastal colonies of this bird. To make proper decisions in invasive predator management, information is needed on the effects of cat removal on the tropicbird breeding success and the possible resulting increase in egg predation by rats in the case of any “mesopredator release effects”. In this study researchers collected the first season of data needed to assess the effect of cat removal on the breeding success of the tropicbird on Saba.
You Have Been Framed! How Antecedents of Information Need Mediate the Effects of Risk Communication Messages
Terpstra, T. ; Zaalberg, R. ; Boer, J. de; Botzen, W.J.W. - \ 2014
Risk Analysis 34 (2014)8. - ISSN 0272-4332 - p. 1506 - 1520.
klimaatverandering - overstromingen - risicoanalyse - burgers - informatiebehoeften - climatic change - floods - risk analysis - citizens - information needs - attitude-change - perceived risk - seeking model - fear appeals - flood risks - pre model - trust - preparedness - perception - emotions
This study investigates the processes that mediate the effects of framing flood risks on people's information needs. Insight into the effects of risk frames is important for developing balanced risk communication that explains both risks and benefits of living near water. The research was inspired by the risk information seeking and processing model and related models. In a web-based survey, respondents (n = 1,457) were randomly assigned to one of three communication frames or a control frame (experimental conditions). Each frame identically explained flood risk and additionally refined the message by emphasizing climate change, the quality of flood risk management, or the amenities of living near water. We tested the extent to which risk perceptions, trust, and affective responses mediate the framing effects on information need. As expected, the frames on average resulted in higher information need than the control frame. Attempts to lower fear appeal by stressing safety or amenities instead of climate change were marginally successful, a phenomenon that is known as a “negativity bias.” Framing effects were mediated by negative attributes (risk perception and negative affect) but not by positive attributes (trust and positive affect). This finding calls for theoretical refinement. Practically, communication messages will be more effective when they stimulate risk perceptions and evoke negative affect. However, arousal of fear may have unwanted side effects. For instance, fear arousal could lead to lower levels of trust in risk management among citizens. Regular monitoring of citizens’ attitudes is important to prevent extreme levels of distrust or cynicism.
Expansion of acidophytic late-successional bryophytes in Dutch fens between 1940 and 2000
Paulissen, M.P.C.P. ; Schaminee, J.H.J. ; During, H.J. ; Wamelink, G.W.W. ; Verhoeven, J.T.A. - \ 2014
Journal of Vegetation Science 25 (2014)2. - ISSN 1100-9233 - p. 525 - 533.
nitrogen deposition - co westmeath - scragh-bog - vegetation - mire - acidification - netherlands - ammonium - water - metaanalyses
Question How did frequency and local abundance of key bryophytes in Dutch fens change between 1940 and 2000? Location The Netherlands. Methods A total of 1939 vegetation relevés, objectively assigned to the class Parvocaricetea and dating from the period 1940–1999 inclusive, were extracted from a national Netherlands database. From this relevé set, two additional data sets were derived; these were syntaxonomically homogeneous at the association level. One contained 418 Scorpidio-Caricetum diandrae relevés and the other 956 Pallavicinio-Sphagnetum relevés. The following analyses were done for these three data sets: frequency and local abundance change of 13 bryophyte species over three 20-yr periods were described using logistic regression and the nonparametric Jonckheere–Terpstra test, respectively. Results Acidophytic, late-successional species, notably Sphagnum palustre and Polytrichum uliginosum, have replaced relatively early-successional species such as brown mosses, Sphagnum subnitens and Sphagnum squarrosum during the studied period. The results were mostly consistent across the three data sets. Local abundance patterns generally paralleled those of frequency, although cover trends were often less robust. Conclusions Drastic changes have taken place in the bryophyte layer of Dutch fens between 1940 and 2000. Our study has shown that acidophytic, late-successional bryophytes have replaced relatively early-successional brown moss and Sphagnum species. Both hydrological changes and nutrient shifts (in particular phosphorus enrichment and ammonium toxicity) appear to have been responsible for the observed rapid shifts in the bryophyte layer of Dutch fens.
Spatial coordination between stem cell activity and cell differentiation in the root meristem
Moubayidin, L. ; Mambro, R. Di; Sozzani, R. ; Pacifici, E. ; Salvi, E. ; Terpstra, I. ; Bao, D. ; Dijken, A. van; Dello loio, R. ; Perilli, S. ; Ljung, K. ; Benfey, P.N. ; Heidstra, R. ; Costantino, P. ; Sabatini, S. - \ 2013
Developmental Cell 26 (2013)4. - ISSN 1534-5807 - p. 405 - 415.
gras gene family - arabidopsis root - auxin biosynthesis - scarecrow - expression - thaliana - transport - division - growth - niche
A critical issue in development is the coordination of the activity of stem cell niches with differentiation of their progeny to ensure coherent organ growth. In the plant root, these processes take place at opposite ends of the meristem and must be coordinated with each other at a distance. Here, we show that in Arabidopsis, the gene SCR presides over this spatial coordination. In the organizing center of the root stem cell niche, SCR directly represses the expression of the cytokinin-response transcription factor ARR1, which promotes cell differentiation, controlling auxin production via the ASB1 gene and sustaining stem cell activity. This allows SCR to regulate, via auxin, the level of ARR1 expression in the transition zone where the stem cell progeny leaves the meristem, thus controlling the rate of differentiation. In this way, SCR simultaneously controls stem cell division and differentiation, ensuring coherent root growth.
Genetical Genomics Reveals Large Scale Genotype-By-Environment Interactions in Arabidopsis thaliana
Snoek, L.B. ; Terpstra, I.R. ; Dekter, R. ; Ackerveken, G. van den; Peeters, A.J. - \ 2013
Frontiers in Genetics Livestock Genomics 3 (2013). - ISSN 1664-8021
One of the major goals of quantitative genetics is to unravel the complex interactions between molecular genetic factors and the environment. The effects of these genotype-by-environment interactions also affect and cause variation in gene expression. The regulatory loci responsible for this variation can be found by genetical genomics that involves the mapping of quantitative trait loci (QTLs) for gene expression traits also called expression-QTL (eQTLs). Most genetical genomics experiments published so far, are performed in a single environment and hence do not allow investigation of the role of genotype-by-environment interactions. Furthermore, most studies have been done in a steady state environment leading to acclimated expression patterns. However a response to the environment or change therein can be highly plastic and possibly lead to more and larger differences between genotypes. Here we present a genetical genomics study on 120 Arabidopsis thaliana, Landsberg erecta × Cape Verde Islands, recombinant inbred lines (RILs) in active response to the environment by treating them with 3 h of shade. The results of this experiment are compared to a previous study on seedlings of the same RILs from a steady state environment. The combination of two highly different conditions but exactly the same RILs with a fixed genetic variation showed the large role of genotype-by-environment interactions on gene expression levels. We found environment-dependent hotspots of transcript regulation. The major hotspot was confirmed by the expression profile of a near isogenic line. Our combined analysis leads us to propose CSN5A, a COP9 signalosome component, as a candidate regulator for the gene expression response to shade.
Virucidal efficacy of hydrogen peroxide vapour disinfection
Tuladhar, E. ; Terpstra, P. ; Koopmans, M. ; Duizer, E. - \ 2012
Journal of Hospital Infection 80 (2012)2. - ISSN 0195-6701 - p. 110 - 115.
time rt-pcr - feline calicivirus - chemical disinfection - murine norovirus - decontamination - inactivation - surfaces - spread - contamination - environment
Background: Viral contamination of surfaces is thought to be important in transmission. Chemical disinfection can be an effective means of intervention, but little is known about the virucidal efficacy of hydrogen peroxide vapour (HPV) against enteric and respiratory viruses. Aim: To measure the virucidal efficacy of HPV against respiratory and enteric viruses on materials representing those found in institutions and homes. Methods: Poliovirus, human norovirus genogroup II. 4 (GII. 4), murine norovirus 1, rotavirus, adenovirus and influenza A (H1N1) virus dried on to stainless steel, framing panel and gauze carriers were exposed to HPV 127 ppm for 1 h at room temperature in an isolator. Poliovirus was also exposed to HPV at different locations in a room. The virucidal effect was measured by comparing recoverable viral titres against unexposed controls. Polymerase chain reaction was used to evaluate the effect of HPV on viral genome reduction. Findings: HPV disinfection resulted in complete inactivation of all viruses tested, characterized by >4 log(10) reduction in infectious particles for poliovirus, rotavirus, adenovirus and murine norovirus on stainless steel and framing panel carriers, and >2 log(10) reduction for influenza A virus on stainless steel and framing panel carriers, and for all viruses on gauze carriers. Complete inactivation of poliovirus was demonstrated at several locations in the room. Reductions in viral genomes were minimal on framing panel and gauze carriers but significant on stainless steel carriers; human norovirus GII. 4 genome was most resistant to HPV treatment. Conclusion: HPV could be an effective virucidal against enteric and respiratory viruses contaminating in-house environments. (C) 2011 The Healthcare Infection Society.
|Virucidal efficacy of vaporized hydrogen peroxide disinfection
Tuladhar, E. ; Terpstra, P.M.J. ; Koopmans, M.P.G. ; Duizer, E. - \ 2011
In: Proceedings of IAFP's European Symposium on Food Safety, Ede, The Netherlands, 18-20 May 2011. - IAFP - p. P1 - 05.
Regulatory Network Identification by Genetical Genomics: Signaling Downstream of the Arabidopsis Receptor-Like Kinase ERECTA
Terpstra, I.R. ; Snoek, L.B. ; Keurentjes, J.J.B. ; Peeters, A.J.M. ; Ackerveken, G. van den - \ 2010
Plant Physiology 154 (2010)3. - ISSN 0032-0889 - p. 1067 - 1078.
wrky transcription factor - defense responses - plant development - mpk4 activation - expression - map - differentiation - resistance - protein - reconstruction
Gene expression differences between individuals within a species can be largely explained by differences in genetic background. The effect of genetic variants (alleles) of genes on expression can be studied in a multifactorial way by application of genetical genomics or expression quantitative trait locus (eQTL) mapping. In this paper we present a strategy to construct regulatory networks by application of genetical genomics in combination with transcript profiling of mutants that are disrupted in single genes. We describe the network identification downstream of the receptor-like kinase ERECTA in Arabidopsis (Arabidopsis thaliana). Extending genetical genomics on the Landsberg erecta/Cape Verde islands (Ler/Cvi) recombinant inbred population with expression profiling of monogenic mutants enabled the identification of regulatory networks in the, so far elusive, ERECTA signal transduction cascade. We provide evidence that ERECTA is the causal gene for the major hotspot for transcript regulation in the Arabidopsis Ler/Cvi recombinant inbred population. We further propose additional genetic variation between Ler and Cvi in loci of the signalling pathway downstream of ERECTA, and suggest candidate genes underlying these loci. Integration of publicly available microarray expression data of other monogenic mutants allowed us to link ERECTA to a downstream MAPK signalling cascade. Our study shows that microarray data of monogenic mutants can be effectively used in combination with genetical genomics data to enhance the identification of genetic regulatory networks.
|Diabetes en leefstijl in Oost-Nederland
Keeman, R. ; Jansen, S.C. ; Terpstra, J.S. ; Haveman-Nies, A. ; Feskens, E.J.M. - \ 2010
Tijdschrift voor Gezondheidswetenschappen 3 (2010)88. - ISSN 1388-7491 - p. 90 - 90.
|Brandveiligheid in zicht
Terpstra, F. ; Oosterwijk, R. ; Wagenberg, A.F. van - \ 2009
TVVL Magazine 38 (2009)7-8. - ISSN 1380-5428 - p. 19 - 21.
|De machine die zelf onkruid wiedt
Henten, E. van; Terpstra, M.J. - \ 2009
De Gelderlander (2009). - 1 p.
Prediction of texture perception of mayonnaises from rheological and novel instrumental measurements
Terpstra, M.E.J. ; Jellema, R.H. ; Janssen, A.M. ; Wijk, R.A. de; Prinz, J.F. ; Linden, E. van der - \ 2009
Journal of Texture Studies 40 (2009). - ISSN 0022-4901 - p. 82 - 108.
perceived oral texture - semisolid foods - custard desserts - sensory texture - attributes - mouthfeel - solids - shear - flow - fat
Commercial and model mayonnaises varying in fat content and type and amount of thickener were characterized by sensory analysis, rheological measurements and novel instrumental measurements covering other physicochemical properties and/or reflecting changes of food properties during oral processing. Predictions of texture attributes by rheological measurements were analyzed and compared with predictions by rheological measurements combined with novel measurements. Most of the texture attributes were predicted well by rheological parameters alone. Parameters from other instrumental measurements played a small complementary role, except in the predictions of most of the afterfeel attributes. Most important were rheometry at large deformation and in the nonlinear regime of the dynamic stress sweep and two novel measurements reflecting the effect of saliva: turbidity of rinse water and viscosity with added saliva. Tan d at 500% strain, reflecting the fluid-like character of the samples during high-strain dynamic flow, relates best to creaminess and other texture attributes.