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Technical Expertise Report ref. exp-143, 10/2/2016 - Applicant: Dr. Dirk Huyge, Royal Museums of Art and History, 10, Parc du Cinquantenaire, 1000 Brussels, 26/11/2015
No full textTechnical Expertise Report ref. exp-144, 10/2/2016 - Applicant: Dr. Dirk Huyge, Royal Museums of Art and History, 10, Parc du Cinquantenaire, 1000 Brussels, 26/11/2015
No full textCurrent status of the Oriental fruit fly, <i>Bactrocera dorsalis </i>(Hendel) (Diptera: Tephritidae) presence in South Africa
No full textA new genome sequence resource for five invasive fruit flies of agricultural concern: <i>Ceratitis capitata, C. quilicii, C. rosa, Zeugodacus cucurbitae</i> and <i>Bactrocera zonata</i> (Diptera, Tephritidae)
No full textHere, we present novel high quality genome assemblies for five invasive tephritid species of agricultural concern: Ceratitis capitata, C. quilicii, C. rosa, Zeugodacus cucurbitae and Bactrocera zonata (read depths between 65 and 78x). Three assemblies (C. capitata, C. quilicii and Z. cucurbitae) were scaffolded with chromosome conformation data and annotated using RNAseq reads. For some species this is the first reference genome available (B. zonata, C. quilicii and C. rosa), for others we have published improved annotated genomes (C. capitata and Z. cucurbitae). Together, the new references provide an important resource to advance research on genetic techniques for population control, develop rapid species identification methods, and explore eco-evolutionary studies
Rapport technique d'expertise réf. exp-150 du 12/01/2016 - Demandeur: Mr. Armand Stockmans, SOMEX S.A., Malachietstraat 2 - 2030 Antwerpen, 09/12/2015
No full textConstraining volcanic vent parameters to understand the 2007 brightness surge in Io's Tvashtar plume: A DSMC approach
Full text linkIo's Tvashtar volcanic plume displayed an irregular order of magnitude increase in brightness during the 2007 New Horizons (NH) flyby as the solar phase angle of Io relative to NH increased. High-resolution NH/LORRI images captured the Tvashtar plume's evolution throughout the flyby. We investigate potential causes for the brightness surge by examining whether changes in Tvashtar's volcanic vent properties could have explained the observed brightness increase. Using the captured NH images, a robust method is developed to constrain some of Tvashtar's vent properties. This method involves a sensitivity study of free parameters at Tvashtar's vent using axisymmetric Direct Simulation Monte Carlo (DSMC) simulations incorporating both gas and grain radiation modeling. The analysis examines how variations in these parameters (such as vent stagnation temperature, area, mass flow rate, and grain mass loading) influence the plume canopy's height, width, and overall shape. The sensitivity analysis identifies the vent stagnation temperature and area as the parameters most influential on the plume's canopy characteristics. Given the visibility of Tvashtar's plume canopy throughout the NH flyby, canopy spatial coordinates are extracted from each LORRI image. Subsequently, a Levenberg-Marquardt optimization algorithm is employed to fit DSMC simulation plume canopies, parameterized over a two-dimensional space of stagnation temperature and area, to each extracted canopy. This process yields the optimal pair of vent stagnation temperature and area that best models the observed plume canopy for each case. From the fitting process, we hypothesize an asymmetric source region at Tvashtar, consistent with previous research findings. However, the fitting process also determines that the observed increase in brightness cannot be entirely attributed to changes in vent conditions during the flyby, as there appears to be no correlation between these changes and the surge in brightness. The most plausible explanation for the brightness surge lies in the optical scattering properties of the plume particulates
The UGent Congo Basin forest Centre of Excellence: Integrated ecosystem research in the heart of the Congo basin
Full text linkThe Congo Basin is home to the world s second-largest tropical forest. However, due to a lack of comprehensive research and in situ observations, our understanding of the forest area´s climate is limited, impeding accurate climate change predictions. To address this gap, Ghent University established the UG-CBC (Congo Basin Centre of Excellence) and is currently playing a leading role in ecosystem research in this region. This centre consolidates expertise on the Congo Basin and the forests of the DRC, focusing on field-based ecological and biogeochemical research in pristine forests, secondary forests, and sustainable agriculture through permanent forest inventory plots, eddy covariance and atmospheric measurements, modelling, and remote sensing. Central to several of the research sites lies the CongoFlux site, located in the Yangambi UNESCO biosphere reserve (0°48 52.0 N, 24°30 08.9 E). This site features the region s first Eddy Covariance (EC) tower, accompanied by the region s first wood biology laboratory. The tower is part of the ICOS network, which ensures high-quality data on land-atmosphere exchanges of GHGs such as CO2 , N2 O, CH4 , and H2 O. Additional measurements at the site enhance our understanding of the tropical forest ecosystem, including assessments of O3 and black carbon, soil greenhouse gas exchange, vegetation photosynthesis and water use efficiency, lateral carbon loss, xylogenesis, woody decay rates, and ancillary data collection from permanent plots. These efforts collectively create a rich data hub within the Congo Basin. By addressing this significant research void, the initiative aims to pave the way for better understanding of these crucial forest ecosystems
État des lieux et specificites geologiques des cavites karstiques des formations du sous-groupe schisto-calcaire des regions de Mbanza-Ngungu, Kimpese et Songololo (Kongo-Central, République democratique du Congo).
No full textKarst, and particularly endokarst, has been little studied in the formations of the Schisto-calcaire subgroup in the Mbanza-Ngungu, Kimpese and Songololo regions of Kongo Central Province (DRC), and is therefore poorly understood. Caves are a window on the underground world and play an important role in societal fields such as geology (mineral resources, very important water reservoir), archaeology/anthropology (sites of very ancient human activities) and biology (reserve of endemic cavernicolous animals). They can also be the cause of cave-ins. Studying the endokarst is therefore important for society. This knowledge cannot be acquired without a prior inventory made available to scientists wishing to further research in this field. Inventories existed prior to this study, but they were confined to listing the caves cited in documents, often old ones, produced by archaeologists, biologists and rarely by geologists. The caves cited were generally with approximate locations, or even without locations, which led to confusion as to the uniqueness of the caves cited, or even compared, by the various authors. This study is the result of a compilation of bibliographical data, with relocation in GIS where data permitted, supplemented by field surveys carried out from 2019 to 2022 with the aim of verifying the locations of the caves
Monitoring the wild meat trade through DNA barcoding and pathogen screening of passenger-imported meat
No full textThe INTERCEPT project maps the current situation of monitoring (exotic) animal product imports from third countries into Belgium, highlighting both the legal and illegal aspects of the trade and its implications for public and animal health. Recommendations are being drafted to move towards a more robust framework for long-term monitoring including a centralized database that integrates data from various federal services and agencies to gain a better overview of the trade and to promote the dissemination of crucial information among federal services, agencies, and stakeholders. The project also aims to introduce a secure and efficient sampling method for officials, along with a molecular species identification pipeline for researchers, which will enable rapid DNA-based identification of illegally imported meat. During this project, over 600 specimens have been sampled from intercepted meat from passenger s luggage at Brussels Airport, of which more than 500 samples have so far been identified using DNA barcoding and screened for orthopoxviruses. Metagenomic DNA and RNA sequencing is ongoing for a selection of samples pooled per DNA-confirmed species, preparation method (raw vs. cooked), and, when possible, region of origin. By fostering collaboration among scientific institutions and federal agencies, this initiative aims to inform border control measures and will support future research into pathogens carried by both domestic and exotic meat, allowing better characterisation of the health risks associated with the illegal import of meat from third countries
A Case Study on the Impact of Interplanetary Coronal Mass Ejection on the Martian O(1S) 557.7 nm Dayglow Emission Using ExoMars TGO/NOMAD-UVIS Observations: First Results
Full text linkWe report, for the first time, the impact of interplanetary coronal mass ejections (ICME) on the recently discovered O(1S) 557.7 nm dayglow emission in the Martian atmosphere. While there are a few studies on the seasonal variation of 557.7 nm dayglow emission available in the literature, the impact of ICME has not been investigated so far. Using the instruments aboard the ExoMars-TGO and Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft, we show that the primary emission peak (75–80 km) remains unaffected during ICME events compared to quiet-times. However, an enhancement has been observed in the brightness of the secondary emission peak (110–120 km) and the upper altitude region (140–180 km). The enhancement is attributed to the increased solar electrons, X-ray fluxes and Solar Energetic Particles, augmenting the electron-impact processes causing the enhancement in the brightness. Thus, this study has an implication to the brightness of Martian upper atmosphere during intense solar transients like ICME