Rapportage Netwerken

De Betuwe kent een sterke tuinbouwsector dat opgesplitst kan worden in vier tuinbouwsectoren: glastuinbouw (555 ha, Bommelerwaard en Arnhem-Nijmegen), paddenstoelenteelt (15 ha Maasdriel), fruitteelt (5.200 ha, regio Buren/Geldermalsen) en laanboomteelt (1.300 ha, regio Opheusden). Door meer samenwerking, onderling en binnen de tuinbouwketen, willen de clusters hun gezamenlijke economische positie verder versterken. De ambitie is om de tuinbouw in het Rivierengebied op de (inter)nationale kaart zetten. Doorvoor is in 2006 door de provincie Gelderland en de ondernemers uit de verschillende sectoren gezamenlijk het initiatief genomen om samen te werken onder de noemer Greenport Betuwse Bloem. Samen met kennisinstellingen en maatschappelijke organisaties zien zij mogelijkheden om de logistieke kansen, de energiestromen, het hoogwaardige landschap en het kennisnetwerk in het gebied veel beter te benutten dan nu gebeurt. Deze samenwerking moet de winstgevendheid van de tuinbouw versterken en tegelijkertijd een bijdrage leveren aan het behoud van het typerende landschap

Routine Use of Unilateral and Bilateral Radial Arteries for Coronary Artery Bypass Graft Surgery

AbstractObjectives. This study sought to evaluate the routine use of radial artery (RA) grafts in patients undergoing coronary artery revascularization.Background. Previous long-term studies have documented poor patency of saphenous vein grafts compared with internal thoracic artery (ITA) grafts.Methods. We performed a prospective review of 175 of 249 consecutive patients.Results. Fifty-four patients had bilateral RAs harvested. Mean number (±SD) of grafts/patient was 3.27 ± 0.93, with 2.76 ± 0.97 arterial grafts; a mean of 1.53 ± 0.68 grafts were performed with the RA. The operative mortality rate was 1.6%. No deaths were related to RA grafts, and there were no RA harvest site hematomas or infections. Transient dysesthesia 1 day to 4 weeks in duration occurred in the distribution of the lateral antebrachial cutaneous nerve in six extremities (2.6%). Elective cardiac catheterization in 60 patients at 12 weeks postoperatively demonstrated a 95.7% patency rate.Conclusions. Because of potential benefit of long-term patency associated with arterial grafts, minimal morbidity and mortality associated with use of the RA and excellent short-term patency rates, we cautiously recommend use of one or both RAs as additional conduits to be used concomitantly with the ITA for arterial revascularization of the coronary arteries

Forecasting basketball players’ performance using sparse functional data

Statistics and analytic methods are becoming increasingly important in basketball. In particular, predicting players’ performance using past observations is a considerable challenge. The purpose of this study is to forecast the future behavior of basketball players. The available data are sparse functional data, which are very common in sports. So far, however, no forecasting method designed for sparse functional data has been used in sports. A methodology based on two methods to handle sparse and irregular data, together with the analogous method and functional archetypoid analysis is proposed. Results in comparison with traditional methods show that our approach is competitive and additionally provides prediction intervals. The methodology can also be used in other sports when sparse longitudinal data are available

To explore or to exploit? Learning humans' behaviour to maximize interactions with them

Assume a robot operating in a public space (e.g., a library, a museum) and serving visitors as a companion, a guide or an information stand. To do that, the robot has to interact with humans, which presumes that it actively searches for humans in order to interact with them. This paper addresses the problem how to plan robot's actions in order to maximize the number of such interactions in the case human behavior is not known in advance. We formulate this problem as the exploration/exploitation problem and design several strategies for the robot. The main contribution of the paper than lies in evaluation and comparison of the designed strategies on two datasets. The evaluation shows interesting properties of the strategies, which are discussed

Thrombin responses in human endothelial cells. Contributions from receptors other than PAR1 include the transactivation of PAR2 by thrombin-cleaved PAR1.

The recent identification of two new thrombin receptors, PAR3 and PAR4, led us to re-examine the basis for endothelial cell responses to thrombin. Human umbilical vein endothelial cells (HUVEC) are known to express PAR1 and the trypsin/tryptase receptor, PAR2. Northern blots detected both of those receptors and, to a lesser extent, PAR3, but PAR4 message was undetectable and there was no response to PAR4 agonist peptides. To determine whether PAR3 or any other receptor contributes to thrombin signaling in HUVEC, PAR1 cleavage was blocked with two selective antibodies and PAR1 activation was inhibited with the antagonist, BMS200261. The antibodies completely inhibited HUVEC responses to thrombin, but BMS200261 was only partly effective, even though separate studies established that the antagonist completely inhibits PAR1 signaling at the concentrations used. Since peptides mimicking the PAR1 tethered ligand domain can also activate PAR2, we asked whether the remaining thrombin response in the presence of the antagonist could be due in part to the intermolecular transactivation of PAR2 by cleaved PAR1. Evidence that transactivation can occur was obtained in COS-7 cells co-expressing PAR2 and a variant of PAR1 that can be cleaved, but not signal. There was a substantial response to thrombin only in cells expressing both receptors. Conversely, in HUVEC, complete blockade of the thrombin response by the PAR1 antagonist occurred only when signaling through PAR2 was also blocked. From these observations we conclude that 1) PAR1 is the predominant thrombin receptor expressed in HUVEC and cleavage of PAR1 is required for endothelial cell responses to thrombin; 2) although PAR3 may be expressed, there is still no evidence that it mediates thrombin responses; 3) PAR4 is not expressed on HUVEC; and 4) transactivation of PAR2 by cleaved PAR1 can contribute to endothelial cell responses to thrombin, particularly when signaling through PAR1 is blocked. Such transactivation may limit the effectiveness of PAR1 antagonists, which compete with the tethered ligand domain rather than preventing PAR1 cleavage

Mutations in CHMP2B in lower motor neuron predominant amyotrophic lateral sclerosis (ALS)

Background: Amyotrophic lateral sclerosis (ALS), a common late-onset neurodegenerative disease, is associated with fronto-temporal dementia (FTD) in 3-10% of patients. A mutation in CHMP2B was recently identified in a Danish pedigree with autosomal dominant FTD. Subsequently, two unrelated patients with familial ALS, one of whom also showed features of FTD, were shown to carry missense mutations in CHMP2B. The initial aim of this study was to determine whether mutations in CHMP2B contribute more broadly to ALS pathogenesis. Methodology/Principal Findings: Sequencing of CHMP2B in 433 ALS cases from the North of England identified 4 cases carrying 3 missense mutations, including one novel mutation, p. Thr104Asn, none of which were present in 500 neurologically normal controls. Analysis of clinical and neuropathological data of these 4 cases showed a phenotype consistent with the lower motor neuron predominant (progressive muscular atrophy (PMA)) variant of ALS. Only one had a recognised family history of ALS and none had clinically apparent dementia. Microarray analysis of motor neurons from CHMP2B cases, compared to controls, showed a distinct gene expression signature with significant differential expression predicting disassembly of cell structure; increased calcium concentration in the ER lumen; decrease in the availability of ATP; down-regulation of the classical and p38 MAPK signalling pathways, reduction in autophagy initiation and a global repression of translation. Transfection of mutant CHMP2B into HEK-293 and COS-7 cells resulted in the formation of large cytoplasmic vacuoles, aberrant lysosomal localisation demonstrated by CD63 staining and impairment of autophagy indicated by increased levels of LC3-II protein. These changes were absent in control cells transfected with wild-type CHMP2B. Conclusions/Significance: We conclude that in a population drawn from North of England pathogenic CHMP2B mutations are found in approximately 1% of cases of ALS and 10% of those with lower motor neuron predominant ALS. We provide a body of evidence indicating the likely pathogenicity of the reported gene alterations. However, absolute confirmation of pathogenicity requires further evidence, including documentation of familial transmission in ALS pedigrees which might be most fruitfully explored in cases with a LMN predominant phenotype

Optical properties of self-assembled InAs quantum islands grown on InP(001) vicinal substrates

International audienceWe have investigated the effect of misorientated InP001 substrates on the optical properties of InAs quantum islands QIs grown by molecular-beam epitaxy in the Stranski-Krastanow regime. Detailed temperature-dependent photoluminescence PL, excitation density PL, and polarization of photoluminescence PPL are studied. PPL shows a high degree of linear polarization near 40% for the nominally oriented substrate n and for the substrate with 2° off miscut angle toward the 110 direction (2° F), while it is near 15% for the substrate with 2° off miscut angle towards 010 direction (2° B), indicating the growth of InAs quantum wires on nominal and 2° F substrates and of InAs quantum dots on 2° B substrate. These island shapes are confirmed by morphological investigations performed by atomic force microscopy. The integrated PL intensity remains very strong at room temperature, as much as 36% of that at 8 K, indicating a strong spatial localization of the carriers in the InAs QIs grown on InP001