1,695 research outputs found

    Family business in the Dutch SME-sector

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    Dit rapport geeft inzicht in de rol die familiebedrijven spelen in het midden- en kleinbedrijf in Nederland. Er worden definities gegeven van familiebedrijven en er wordt een vergelijking gemaakt tussen familiebedrijven en niet-familiebedrijven.

    Endothelial plasticity in fibrosis and epigenetics as a therapeutic target

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    Endothelial cells are cells that are lining blood vessels and are in direct contact with the blood. These cells are important because they form a barrier between the blood and adjacent tissues. However, different stimuli can damage these endothelial cells, turning them into more elongated (mesenchymal) cells which are starting to secrete different substances. This leads to a loss of barrier function and contributes to various diseases such as heart and kidney diseases.This change from endothelial cells to more elongated (mesenchymal) cells occurs when certain genes are switched 'on' while others are switched off. This switching on and off of genes is regulated by a group of proteins and is called epigenetics.In this thesis, we investigate how these proteins (epigenetics) influence the transformation of endothelial cells into more elongated (mesenchymal) cells. An overview is provided of all proteins that play a role in this, and new proteins are discovered that may play a role in this.Finally, in this thesis, therapies are developed to change these proteins (epigenetics), which leads to the reduction of heart and kidney diseases in mice. The knowledge gained in this thesis can hopefully also be applied to humans in the future

    Technologische samenwerking in de industrie en de zakelijke diensten

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    Om een samenwerkingsverband tot een succes te laten worden, is het van groot belang dat men vertrouwen heeft in elkaar, dat afspraken duidelijk vastgelegd zijn en worden nagekomen en dat er openheid bestaat tussen de partners. Het succes van een technologisch samenwerkingsverband wordt vooral bepaald door goede onderlinge relaties. Dit geldt met name voor kleinere bedrijven. De monitor Technologische Samenwerking volgt de ontwikkelingen in technologische samenwerking gedurende drie jaar. De uitkomsten betreffen de tweede meting.

    Improving patient selection towards personalized treatment decisions in esophageal cancer

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    Om de overleving van patiënten met een lokaal gevorderd slokdarmcarcinoom te verbeteren worden patiënten behandeld met chemoradiotherapie alvorens geopereerd te worden. Echter, niet iedereen heeft baat bij deze neoadjuvante chemoradiotherapie (nCRT). Het doel van dit promotieonderzoek was om de selectie en behandeling van patiënten met slokdarmkanker te verbeteren en zo toe te werken naar een gepersonaliseerde behandeling. In dit proefschrift werd aangetoond dat endoechografie de behandeling in 29% van de patiënten beïnvloedde na stadiering met een 18F-FDG PET/CT-scan. Echter, zelfs na stadiëring met deze beeldvormende technieken bleek de beoordeling van lymfekliermetastasen vaak inaccuraat. Re-stadiëring na nCRT en vóór de slokdarmoperatie met CT-scans bleek nuttig, maar matig effectief, waarbij op basis van literatuuronderzoek een prominentere rol blijkt te zijn weggelegd voor 18F-FDG PET/CT-scans. In een gepersonaliseerde behandeling is naast een adequate stadiëring, een goede inschatting welke patiënt baat heeft bij nCRT onmisbaar. Hoewel uitbreiding van traditionele inclusiecriteria voor nCRT niet tot een toename van bijwerkingen en mortaliteit leidde, was de overleving wel significant lager. Daarnaast veranderde nCRT de prognostische waarde van een vrije circumferentiële resectie marge op de overleving. Patiënten met een pathologisch complete respons (pCR: 25-42%) zouden in de toekomst mogelijk voordeel hebben bij een ‘wait-and-see’ beleid. In dit proefschrift werd aangetoond dat textural features, verkregen uit PET/PET-CT-scans, waardevol zijn in de predictie van pCR. Tot slot bleek in een pilotstudie dat diffusie gewogen magnetic resonance imaging (DW-MRI) van additionele waarde was op de standaard 18F-FDG PET/CT-scan in de detectie van pCR

    Normalized Cut Group Clustering of Resting-State fMRI Data

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    BACKGROUND: Functional brain imaging studies have indicated that distinct anatomical brain regions can show coherent spontaneous neuronal activity during rest. Regions that show such correlated behavior are said to form resting-state networks (RSNs). RSNs have been investigated using seed-dependent functional connectivity maps and by using a number of model-free methods. However, examining RSNs across a group of subjects is still a complex task and often involves human input in selecting meaningful networks. METHODOLOGY/PRINCIPAL FINDINGS: We report on a voxel based model-free normalized cut graph clustering approach with whole brain coverage for group analysis of resting-state data, in which the number of RSNs is computed as an optimal clustering fit of the data. Inter-voxel correlations of time-series are grouped at the individual level and the consistency of the resulting networks across subjects is clustered at the group level, defining the group RSNs. We scanned a group of 26 subjects at rest with a fast BOLD sensitive fMRI scanning protocol on a 3 Tesla MR scanner. CONCLUSIONS/SIGNIFICANCE: An optimal group clustering fit revealed 7 RSNs. The 7 RSNs included motor/visual, auditory and attention networks and the frequently reported default mode network. The found RSNs showed large overlap with recently reported resting-state results and support the idea of the formation of spatially distinct RSNs during rest in the human brain

    Electrochemistry of potentially bioreductive alkylating quinones : Part 1. Electrochemical properties of relatively simple quinones, as model compounds of mitomycin- and aziridinylquinone-type antitumour agents

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    The influence of methyl-, hydroxy and amino substituents on the electrochemical behaviour of simple 1,4-naphtho-and 1,4-benzoquinones, model compounds of many quinoid antitumour agents, in aqueous media was studied. Significant changes in electrochemical behaviour were observed, potentially the result of a change in the electron density of the quinone moiety, pre- or post-protonation of substituents, hydrogen bond formation, tautomerization reactions and steric interactions between the quinone moiety and substituents. The information obtained was of benefit in the elucidation of the reduction mechanisms of quinoid antitumour agents such as aziridnylquinones and mitomycins

    Mass-Forming Portal Biliopathy Presenting as Extreme Wall-Thickening of the Common Bile Duct

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    Portal biliopathy refers to biliary tree abnormalities in patients with peribiliary collateral vessels and non-neoplastic extrahepatic portal vein occlusion. These biliary abnormalities are caused by vascular compression and ischemic damage of the biliary tree, which can result in bile duct compression, stenosis, fibrotic strictures, bile duct dilation, and thickening of the bile duct wall. Portal biliopathy is difficult to distinguish from cholangiocarcinoma, IgG4-related disease, and sclerosing cholangitis. Although most patients are asymptomatic, portal biliopathy can lead to serious complications, such as recurrent cholangitis. This case illustrates the importance of including portal biliopathy in the differential diagnosis at an early stage, especially in patients with portal hypertension. With early recognition, the need for additional invasive diagnostic procedures such as biopsies is minimized. Pathogenesis, clinical presentation, diagnostics, and treatment options of portal biliopathy are described in the article
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