oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 22 )

2018 ( 50 )

2017 ( 42 )

2016 ( 54 )

Custom range...

Search Results: 1 - 10 of 35443 matches for " Mike van Keulen "
All listed articles are free for downloading (OA Articles)
Page 1 /35443
Display every page Item
Coral-Bacterial Communities before and after a Coral Mass Spawning Event on Ningaloo Reef
Janja Ceh, Jean-Baptiste Raina, Rochelle M. Soo, Mike van Keulen, David G. Bourne
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0036920
Abstract: Bacteria associated with three coral species, Acropora tenuis, Pocillopora damicornis and Tubastrea faulkneri, were assessed before and after coral mass spawning on Ningaloo Reef in Western Australia. Two colonies of each species were sampled before and after the mass spawning event and two additional samples were collected for P. damicornis after planulation. A variable 470 bp region of the 16 S rRNA gene was selected for pyrosequencing to provide an understanding of potential variations in coral-associated bacterial diversity and community structure. Bacterial diversity increased for all coral species after spawning as assessed by Chao1 diversity indicators. Minimal changes in community structure were observed at the class level and data at the taxonomical level of genus incorporated into a PCA analysis indicated that despite bacterial diversity increasing after spawning, coral-associated community structure did not shift greatly with samples grouped according to species. However, interesting changes could be detected from the dataset; for example, α-Proteobacteria increased in relative abundance after coral spawning and particularly the Roseobacter clade was found to be prominent in all coral species, indicating that this group may be important in coral reproduction.
Antagonist of chemokine receptors CCR1 and CCR3
Ammit Alaina,Sabroe I,Peck MJ,Van Keulen BJ
Respiratory Research , 2000, DOI: 10.1186/rr-2001-68565
Abstract:
Optimal Energy Management in Hybrid Electric Trucks Using Route Information Optimisation de la gestion de l’énergie dans des véhicules poids lourds électriques hybrides utilisant le guidage d’itinéraire
van Keulen T.,de Jager B.,Serrarens A.,Steinbuch M.
Oil & Gas Science and Technology , 2009, DOI: 10.2516/ogst/2009026
Abstract: To benchmark a hybrid vehicle’s Energy Management Strategy (EMS) usually a given, often certified, velocity trajectory is exploited. In this paper it is reasoned that it is also beneficial to optimize the velocity trajectory. Especially optimizing the vehicle braking trajectories, through maximization of energy recuperation, results in considerable fuel savings on the same traveled distance. Given future route (target velocities as function of traveled distance/location), traffic, and possibly weather information, together with the vehicle’s road load parameters, the future power request trajectory can be estimated. Dynamic Programming (DP) techniques can then be used to predict the optimal power split trajectory for the upcoming route, such that a desired state-of-charge at the end of the route is reached. The DP solution is re-calculated at a certain rate in order to adapt to changing conditions, e.g., traffic conditions, and used in a lower level real-time EMS to guarantee both battery state-of-charge as well as minimal fuel consumption. Pour évaluer la Stratégie de Gestion de l’énergie (SGE) d’un véhicule hybride, on exploite généralement un cycle de conduite donné, souvent certifié. Dans cet article, l’optimisation de l’itinéraire appara t aussi comme nécessaire. L’optimisation, en particulier, des conditions de freinage du véhicule, par la maximisation de la récupération d’énergie, permet des économies considérables de combustible sur une même distance parcourue. Pour un itinéraire donné (vitesses cibles en fonction de la distance parcourue et de la position), compte tenu des conditions de circulation, des éventuelles données météorologiques et des paramètres de perte du véhicule, on peut estimer les besoins en puissance nécessaire pour le parcourir. Des techniques de Programmation Dynamique (PD) peuvent alors être employées pour prévoir la répartition de puissance optimale pour un parcours donné, sous condition qu’un état de charge cible soit atteint à la fin du parcours. La solution est recalculée périodiquement afin de l’adapter aux nouvelles conditions du parcours (par exemple, aux conditions de circulation) et est utilisée dans une couche plus basse de la SGE en temps réel pour garantir l’état de charge de la batterie ainsi que la consommation d’essence minimale.
Von Balthasar y el giro estético de la exégesis veterotestamentaria: Un caso de estudio. Poder y alianza en la transición de Saúl a David
Treek Nilsson,Mike van;
Teología y vida , 2009, DOI: 10.4067/S0049-34492009000100023
Abstract: the present study attempts to delve deeply into the question of the pertinence of the balthasarian esthetic perspective within the framework of narrative analysis, an approach that claims for itself the label of esthetic recovery of the biblical text. for this purpose, we take what, according to von balthasar, ought to be -with broad strokes- the content of a theological (biblical) esthetics. this being defined as an articulation of the thematics of glory, the creature-companion of god and the covenant, man′s being is seen as a being-in-covenant. the old testament is of vital importance to the category of covenant and thematicizes it in a narrative manner on various occasions. in this writing one of these is analyzed- that is, the transition of power from saul to david, motivated precisely by the rupture of the covenant relationship on saul′s part. we ask ourselves what the staging of the scene is like and, particularly, how the problem of power is focused upon. the account permits the reader to visualize the grafting-on of the covenant alliance within a conflict of power where its theological legitimacy is set in the framework of the fulfillment of the covenant that allows violence among human beings to be limited. thus, thanks to an entirely literary approach, it becomes possible to appreciate the anthropological and theological texture of von balthasar′s esthetic allegation.
Von Balthasar y el giro estético de la exégesis veterotestamentaria: Un caso de estudio. Poder y alianza en la transición de Saúl a David
Mike van Treek Nilsson
Teología y vida , 2009,
Abstract: El presente estudio pretende ahondar en la pregunta por la pertinencia de la perspectiva estética balthasariana dentro del marco del análisis narrativo, una aproximación que clama para sí la etiqueta de la recuperación estética del texto bíblico. Para ello, tomamos lo que según von Balthasar debería ser -a grandes razgos- el contenido de una estética (bíblica) teológica. Definida ésta como una articulación de las temáticas de la gloria, el compa ero creatural de Dios y la alianza, el ser del hombre es visto como un ser-en-alianza. Al Antiguo Testamento le es de vital importancia la categoría de alianza y la tematiza narrativamente en varias ocasiones. En este escrito se analiza una de ellas, a saber, la transición del poder de Saúl a David, motivada precisamente por la ruptura de la alianza por parte de Saúl. Nos preguntamos cómo es la puesta en escena y particularmente cómo es enfocado el problema del poder. El relato permite al lector visualizar la ′alianza′ injertada en un conflicto de poder donde su legitimidad teológica de éste está enmarcada en el cumplimiento de la alianza que permite limitar la violencia entre los humanos. Así, gracias a una aproximación totalmente literaria, es posible apreciar la textura antropológica y teológica del alegato estético de von Balthasar. The present study attempts to delve deeply into the question of the pertinence of the balthasarian esthetic perspective within the framework of narrative analysis, an approach that claims for itself the label of esthetic recovery of the biblical text. For this purpose, we take what, according to von Balthasar, ought to be -with broad strokes- the content of a theological (biblical) esthetics. This being defined as an articulation of the thematics of glory, the creature-companion of God and the covenant, man′s being is seen as a being-in-covenant. The Old Testament is of vital importance to the category of covenant and thematicizes it in a narrative manner on various occasions. In this writing one of these is analyzed- that is, the transition of power from Saul to David, motivated precisely by the rupture of the covenant relationship on Saul′s part. We ask ourselves what the staging of the scene is like and, particularly, how the problem of power is focused upon. The account permits the reader to visualize the grafting-on of the covenant alliance within a conflict of power where its theological legitimacy is set in the framework of the fulfillment of the covenant that allows violence among human beings to be limited. Thus, thanks to an entirely literary approach, it becomes possib
Por qué murió Jesús? Iniciación a los Evangelios: Volumen III: lectura del protagonista
Mike van Treek
Teología y vida , 2009,
Abstract:
Polyunsaturated fatty acids in various macroalgal species from north Atlantic and tropical seas
Vincent JT van Ginneken, Johannes PFG Helsper, Willem de Visser, Herman van Keulen, Willem A Brandenburg
Lipids in Health and Disease , 2011, DOI: 10.1186/1476-511x-10-104
Abstract: The fatty acid (FA) composition in lipids from seven sea weed species from the North Sea (Ulva lactuca, Chondrus crispus, Laminaria hyperborea, Fucus serratus, Undaria pinnatifida, Palmaria palmata, Ascophyllum nodosum) and two from tropical seas (Caulerpa taxifolia, Sargassum natans) was determined using GCMS. Four independent replicates were taken from each seaweed species.Omega-3 (n-3) and omega-6 (n-6) polyunsaturated fatty acids (PUFAs), were in the concentration range of 2-14 mg/g dry matter (DM), while total lipid content ranged from 7-45 mg/g DM. The n-9 FAs of the selected seaweeds accounted for 3%-56% of total FAs, n-6 FAs for 3%-32% and n-3 FAs for 8%-63%. Red and brown seaweeds contain arachidonic (C20:4, n-6) and/or eicosapentaenoic acids (EPA, C20:5, n-3), the latter being an important "fish" FA, as major PUFAs while in green seaweeds these values are low and mainly C16 FAs were found. A unique observation is the presence of another typical "fish" fatty acid, docosahexaenoic acid (DHA, C22:6, n-3) at ≈ 1 mg/g DM in S. natans. The n-6: n-3 ratio is in the range of 0.05-2.75 and in most cases below 1.0. Environmental effects on lipid-bound FA composition in seaweed species are discussed.Marine macroalgae form a good, durable and virtually inexhaustible source for polyunsaturated fatty acids with an (n-6) FA: (n-3) FA ratio of about 1.0. This ratio is recommended by the World Health Organization to be less than 10 in order to prevent inflammatory, cardiovascular and nervous system disorders. Some marine macroalgal species, like P. palmata, contain high proportions of the "fish fatty acid" eicosapentaenoic acid (EPA, C20:5, n-3), while in S. natans also docosahexaenoic acid (DHA, C22:6, n-3) was detected.Polyunsaturated fatty acids (PUFAs) are essential nutrients which cannot, or only to a limited extent, be synthesised by mammals. Therefore, they must be ingested via dietary sources [1,2]. The two main PUFA classes are omega-3 (n-3) and omega-6 (n-6). The
Recovery of Donor Meadows of Posidonia sinuosa and Posidonia australis Contributes to Sustainable Seagrass Transplantation
Jennifer J. Verduin,E. I. Paling,M. van Keulen,Lotte E. Rivers
International Journal of Ecology , 2012, DOI: 10.1155/2012/837317
Abstract: Donor meadow recovery is important in deciding whether removal of material from natural seagrass meadows is a sustainable activity. Thus an investigation into meadow regrowth was undertaken as part of a large-scale seagrass rehabilitation effort in Cockburn Sound, Western Australia. Several plug extraction configurations were examined in Posidonia sinuosa and Posidonia australis meadows to monitor shoot growth into plug scars. No significant differences in shoot growth between extraction configurations were observed, and both species increased their shoot numbers over two years, with P. sinuosa showing a significantly better recovery rate than P. australis. P. sinuosa shoot recovery into extracted areas was 2.2±0.1 shoots over 24 months, similar to shoot changes in controls (2.3 shoots over the same period). P. australis shoot recovery for each configuration was 0.8 ± 0.3 shoots in 24 months compared with 1.5 shoots in the controls. Based on the number of regrowing shoots, the predicted recovery time of a meadow is estimated at 4 years for P. sinuosa and three years for P. australis. Different plug extraction configurations do not appear to affect meadow recovery, and it can be concluded that established meadows of both species are sustainable providers of planting units for rehabilitation measures.
Analysis of iguana iguana farming systems in nicaragua, costa rica and panama
Eilers,Karen; Koops,Wiebe; Udo,Henk; Van Keulen,Herman; Noordhuizen,Jos;
Interciencia , 2002,
Abstract: this survey evaluated existing iguana iguana (green iguana) farming systems in nicaragua, costa rica and panama. data were gathered in 1997, by interviewing iguana farmers, their neighbors, iguana experts and government officials about the purported socio-economic and ecological benefits of iguana farming. iguana farming was expected to provide additional revenue, stimulate nature conservation, produce animal protein, increase the number of trees and augment knowledge about nature. a major constraint was the initial investment, especially when banks provided no credit programs and smallholders depended on credit schemes of ngos. in nicaragua and panama, the existing iguana farming systems had poor prospects to generate additional revenue. iguana farming had ecological benefits as it stimulated nature conservation attitudes, conservation of trees, augmented the knowledge of farmers about nature and relied on local feed resources. existing legislation and regulations on iguana farming and trade limited the possibilities of commercializing iguanas and their products. most iguana farming systems did not generate extra income, had high initial costs, needed professional help to meet the statutory requirements. to introduce iguana farming successfully, it must be profitable for farmers and they must be given professional help to meet the statutory requirements for iguana farming
A Single Vaccination with an Improved Nonspreading Rift Valley Fever Virus Vaccine Provides Sterile Immunity in Lambs
Nadia Oreshkova, Lucien van Keulen, Jet Kant, Rob J. M. Moormann, Jeroen Kortekaas
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077461
Abstract: Rift Valley fever virus (RVFV) is an important pathogen that affects ruminants and humans. Recently we developed a vaccine based on nonspreading RVFV (NSR) and showed that a single vaccination with this vaccine protects lambs from viremia and clinical signs. However, low levels of viral RNA were detected in the blood of vaccinated lambs shortly after challenge infection. These low levels of virus, when present in a pregnant ewe, could potentially infect the highly susceptible fetus. We therefore aimed to further improve the efficacy of the NSR vaccine. Here we report the expression of Gn, the major immunogenic protein of the virus, from the NSR genome. The resulting NSR-Gn vaccine was shown to elicit superior CD8 and CD4-restricted memory responses and improved virus neutralization titers in mice. A dose titration study in lambs revealed that the highest vaccination dose of 106.3 TCID50/ml protected all lambs from clinical signs and viremia. The lambs developed neutralizing antibodies within three weeks after vaccination and no anamnestic responses were observed following challenge. The combined results suggest that sterile immunity was achieved by a single vaccination with the NSR-Gn vaccine.
Page 1 /35443
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.