Semantic representations of English verbs and their influence on psycholinguistic performance in healthy and language-impaired speakers

Background – English verbs are linguistically more complex than nouns and this has contributed to the dearth of in-depth investigation into similarities and differences between their representations within semantic memory and subsequent implications for language processing. However, recent theoretical accounts have argued that verbs and nouns are represented within a unitary semantic system. Aims – This thesis investigates the semantic representations of English verbs with particular attention to how verbs are inter-related as a consequence of semantic similarity. This is achieved through a series of psycholinguistic experiments with healthy adult speakers and an intervention study with adults with aphasia (i.e. acquired communication impairment). Throughout the thesis, comparisons are made to the semantic representations of nouns either directly (i.e. through parallel experimentation) or indirectly (i.e. through the existing literature). Methods – The experiments conducted with healthy adult speakers included: (1) category listing of verbs; (2) typicality rating of verbs within categories; (3) similarity rating of verb pairs; (4) an analysis of verbs’ semantic features; (5) category verification of verbs; and (6) semantically primed picture naming of actions. The intervention study carried out with adults with aphasia compared patterns of improvement in verb and noun retrieval following a semantically-based therapy task. Results and discussion – The results of the experiments shed light on the nature of semantic representations of verbs, in particular, in relation to the similarity between the semantic representations of verbs and those of nouns and also where they differ. These insights are considered in terms of how they provide evidence for or against a unitary semantic system for verbs’ and nouns’ semantic representations and parallel mechanisms for accessing these representations. Two themes emerged in terms of future research potential: (1) the influence of polysemy on speaker’s performance in psycholinguistic tasks; and (2) the nature and influence of typicality within categories/cluster of verbs.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Methods and apparatus for the production of carbon-containing materials

The present invention provides various methods and apparatus for the production of fullerenes and other carbon-containing materials. In some aspects, the invention provides an arc chamber comprising a graphite element Support, wherein the Support comprises a rotatable frame adapted for moving each graphite element towards and away from an arc discharge position. In other aspects, the invention provides a collection chamber for collecting carbon-containing materials produced in an arc chamber, wherein the collection chamber comprises an inlet and a rotatable element arranged to direct the carbon containing material to a wall of the collection chamber, wherein the sectional area occupied by the rotatable element increases with distance from the inlet. In other aspects, the invention provides a collection chamber comprising means for isolating the collection chamber from an arc discharge apparatus and an inlet for the introduction of solvent into the collection chamber

Using size-selected gold clusters on graphene oxide films to aid cryo-transmission electron tomography alignment

A three-dimensional reconstruction of a nano-scale aqueous object can be achieved by taking a series of transmission electron micrographs tilted at different angles in vitreous ice: cryo-Transmission Electron Tomography. Presented here is a novel method of fine alignment for the tilt series. Size-selected gold clusters of ~2.7 nm (Au(561 ± 14)), ~3.2 nm (Au(923 ± 22)), and ~4.3 nm (Au(2057 ± 45)) in diameter were deposited onto separate graphene oxide films overlaying holes on amorphous carbon grids. After plunge freezing and subsequent transfer to cryo-Transmission Electron Tomography, the resulting tomograms have excellent (de-)focus and alignment properties during automatic acquisition. Fine alignment is accurate when the evenly distributed 3.2 nm gold particles are used as fiducial markers, demonstrated with a reconstruction of a tobacco mosaic virus. Using a graphene oxide film means the fiducial markers are not interfering with the ice bound sample and that automated collection is consistent. The use of pre-deposited size-selected clusters means there is no aggregation and a user defined concentration. The size-selected clusters are mono-dispersed and can be produced in a wide size range including 2–5 nm in diameter. The use of size-selected clusters on a graphene oxide films represents a significant technical advance for 3D cryo-electron microscopy

Statement on the dossier for a derogation request for the US authorities concerning cold-treated strawberry plants intended for planting.

Following a request from the European Commission, the EFSA Panel on Plant Health examined the report “Evaluation of Strawberry Nursery Plant Cold Treatments on Survival of the Whitefly, Bemisia tabaci”, submitted to the European Commission by the United States Department of Agriculture (USDA). The report serves as technical justification for a derogation from requirements listed in Annex IV, Part A, Section 1, point 46 of the Council Directive 2000/29/EC. The Panel concluded that due to shortcomings in the report itself and in the experimental design of the study, this report does not demonstrate the effectiveness of the cold treatment proposed for the elimination of B. tabaci from strawberry plant consignments prepared for shipment to the EU. In addition, the Panel conducted a preliminary review of the available literature on viruses of strawberry and concluded that no B. tabaci‐transmitted viruses are currently known to infect strawberry and that no viruses of Fragaria listed in European Council Directive 2000/29/EC are known to be transmitted by B. tabaci. However, adult whiteflies of B. tabaci on strawberry consignments can carry plant viruses irrespective of whether strawberry is a host plant for these viruses and thus represent a pathway for the introduction of non‐European viruses. There is also some uncertainty concerning the extent to which known or unknown B. tabaci‐transmitted viruses could infect strawberry. Irrespective of the presence of B. tabaci, strawberry transplants from the US may represent a pathway for the introduction of any non‐European virus (and other potentially harmful organisms) of Fragaria

Scientific Opinion on the assessment of the risk of solanaceous pospiviroids for the EU territory and the identification and evaluation of risk management options.

Following a request from the EU Commission, the EFSA PLH Panel conducted a risk assessment for the EU territory of pospiviroids affecting solanaceous crops, identified and evaluated risk reduction options and evaluated the EU provisional emergency measures targeting Potato spindle tuber viroid (PSTVd). The risk assessment included PSTVd, Citrus exocortis viroid, Columnea latent viroid, Mexican papita viroid, Tomato apical stunt viroid, Tomato chlorotic dwarf viroid, Tomato planta macho viroid, Chrysanthemum stunt viroid and Pepper chat fruit viroid. Four entry pathways were identified, three involving plant propagation material, with moderate probability of entry, and one involving plant products for human consumption, with low probability of entry. The probability of establishment was considered very high. Spread was considered likely within a crop and moderately likely between crop species, with exception of spread to potato, rated as unlikely. The probability of long distance spread within vegetatively propagated crops was estimated as likely/very likely. The direct consequences were expected to be major in potato and tomato, moderate in pepper, minimal/minor in other vegetables and minimal in ornamentals. Main risk assessment uncertainties derive from limited knowledge on pospiviroids other than PSTVd, although all pospiviroids are expected to have similar biological properties. Management options to reduce risk of entry, spread and consequences were identified and evaluated. No management options can prevent establishment. Examples of successful PSTVd eradication are linked to timely and strict implementation of measures. Uncertainty exists on the effectiveness of risk reduction strategies targeting only one pathway. The EU provisional emergency measures appeared to have significantly reduced PSTVd incidence in Solanum jasminoides and Brugmansia sp., even though eradication from the EU is so far incomplete. The low PSTVd incidence in food crops did not permit to conclude whether the reduction in PSTVd prevalence in ornamentals led to a reduction in outbreaks in food crops

Statement on a study proposal prepared by the UC to support a future derogation request from the EU import requirements for wood packaging material originating in the US and used to pack and transport military ammunition. Scientific Opinion.

Following a request from the European Commission, the EFSA Panel on Plant Health was asked to deliver a statement on a study proposal prepared by the US to support a future derogation request from the Community import requirements for wood packaging material (WPM) originating in the US and used to pack and transport military ammunition. The Panel reviewed the submitted study proposal and based its conclusions on the shortcomings identified in the study proposal. It was concluded that, due to these shortcomings, the evaluation of the methodological approach described in this study proposal with regard to: 1.the determination of the likelihood that live pinewood nematode (Bursaphelenchus xylophilus) and other harmful organisms relevant for the Community are present in the WPM used by the US Department of Defense to pack and transport military ammunition (Pest survey component), 2. the assessment of the likelihood that harmful organisms may be introduced into the Community through the WPM pathway (Pathway Risk Analysis component) cannot be conducted

Scientific Opinion on a technical file submitted by the US Authorities to support a request to list a new opinion among the EU import requirements for wood of Agrilus planipennis host plants.

This document presents the scientific opinion of the Panel on Plant Health on the technical file submitted by the US Authorities to support a request to list a new option among the EU import requirements for wood of Agrilus planipennis host plants. The option under consideration is a heat treatment at 60 °C for 60 min to liminate possible infestations of the wood by the emerald ash borer (EAB). The experiments leading the US Authorities to propose this option are presented in a scientific peer reviewed publication, Myers et al. (2009). The analysis of the aggregated data published by Myers et al. (2009) and based on a Probit regression model showed that the proposed treatment cannot guarantee a control level of 99 % or higher. The analysis of the individual data either from the original measurements or from a corrected dataset, using a Probit regression model, showed that it is likely to observe one live EAB out of an infestation of 100 after the proposed heat treatment of 60 °C /60 min. To ensure a control level of 99 % the temperature of the heat treatment of 60 min should be higher than 70 °C. Results obtained with a Poisson log linear model based on individual data showed that the estimated probability that one insect or more per m2 survive the proposed heat treatment was higher than 0.6 and that there is a 0.1 probability that three insects or more per m2 survive the proposed heat treatment. Based on these results, the Panel concludes that A. planipennis is likely to survive the proposed heat treatment of 60 °C/60 min with a low uncertainty, and that the alternative option proposed in the technical file submitted by the US Authorities for wood does not guarantee the wood to be free of A. planipennis

Enhanced photoelectrochemical water splitting using oxidized mass-selected Ti nanoclusters on metal oxide photoelectrons

We report an enhancement of up to 85% in the photocurrent generated from a bismuth vanadate photoanode through the prior deposition of mass-selected Ti nanoclusters onto the semiconductor surface. We studied the effect of a variety of cluster sizes, deposited at the same density and with the same energy (1.5 keV per cluster), over the surface of separate BiVO4 photoanodes in a cluster beam source. Using mass-selected clusters of a narrow size distribution, we were able to reveal that the photocurrent is strongly dependent on the cluster size (in the size regime examined), leading to an increase of up to 85% in the photocurrent for Ti2000±54 clusters. Remarkably the quantities of metal used to achieve such an enhancement are on the 2.8 × 10−7 g cm−2 level, resulting from the optimum density which is approximately 0.4 monolayers. This work highlights the importance of submonolayer surface treatments, using accurate mass-selected nanoclusters, for the modification of semiconductor surfaces in order to improve the interfacial charge transfer properties

Design data for footwear: sweating distribution on the human foot

Purpose – The purpose of this paper is to provide footwear designers, manikin builders and thermo-physiological modellers with sweat distribution information for the human foot. Design/methodology/approach – Independent research from two laboratories, using different techniques, is brought together to describe sweat production of the foot. In total, 32 individuals were studied. One laboratory used running at two intensities in males and females, and measured sweat with absorbents placed inside the shoe. The other used ventilated sweat capsules on a passive, nude foot, with sweating evaluated during passive heating and incremental exercise to fatigue. Findings – Results from both laboratories are in agreement. Males secreted more than twice the volume of sweat produced by the females (p<0.01) at the same relative work rate. Both genders demonstrated a non-uniform sweat distribution, though this was less variable in females. Highest local sweat rates were observed from the medial ankles (p<0.01). The dorsal foot sweated substantially more than the plantar (sole) areas (p<0.01). Sweating on the plantar side of the foot was uniform. Wearing shoes limited the increase in sweat production with increasing load, while the sweat rate of uncovered feet kept increasing with work and thermal load. Practical implications – The observed variation in sweat rate across the foot shows that footwear design should follow the body mapping principle. Fabrics and materials with different properties can be used to improve comfort if applied to different foot surfaces. The data also demonstrate that foot models, whether physical (manikins) or mathematical, need to incorporate the observed variation across the foot to provide realistic simulation/testing of footwear

Chromium inhibition and size-selected Au nanocluster catalysis for the solution growth of low-density ZnO nanowires

he wet chemical synthesis of nanostructures has many crucial advantages over high-temperature methods, including simplicity, low-cost, and deposition on almost arbitrary substrates. Nevertheless, the density-controlled solution growth of nanowires still remains a challenge, especially at the low densities (e.g. 1 to 10 nanowires/100\u2009\u3bcm2) required, as an example, for intracellular analyses. Here, we demonstrate the solution-growth of ZnO nanowires using a thin chromium film as a nucleation inhibitor and Au size-selected nanoclusters (SSNCs) as catalytic particles for which the density and, in contrast with previous reports, size can be accurately controlled. Our results also provide evidence that the enhanced ZnO hetero-nucleation is dominated by Au SSNCs catalysis rather than by layer adaptation. The proposed approach only uses low temperatures ( 6470\u2009\ub0C) and is therefore suitable for any substrate, including printed circuit boards (PCBs) and the plastic substrates which are routinely used for cell cultures. As a proof-of-concept we report the density-controlled synthesis of ZnO nanowires on flexible PCBs, thus opening the way to assembling compact intracellular-analysis systems, including nanowires, electronics, and microfluidics, on a single substrate