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Martens Katleen,De Boeck Ilke,Jokicevic Katarina,Kiekens Filip,Farré Ricard,Vanderveken Olivier M.,Seys Sven F.,Lebeer Sarah,Hellings Peter W.,Steelant Brecht 대한천식알레르기학회 2021 Allergy, Asthma & Immunology Research Vol.13 No.4
Purpose A defective epithelial barrier has been demonstrated in chronic rhinosinusitis with nasal polyps (CRSwNP). Lactobacilli are shown to restore epithelial barrier defects in gastrointestinal disorders, but their effect on the airway epithelial barrier is unknown. In this study, hence, we evaluated whether the nasopharyngeal isolates Lacticaseibacillus casei AMBR2 and Latilactobacillus sakei AMBR8 could restore nasal epithelial barrier integrity in CRSwNP. Methods Ex vivo trans-epithelial tissue resistance and fluorescein isothiocyanate-dextran 4 kDa (FD4) permeability of nasal mucosal explants were measured. The relative abundance of lactobacilli in the maxillary sinus of CRSwNP patients was analyzed by amplicon sequencing of the V4 region of the 16S rRNA gene. The effect of spray-dried L. casei AMBR2 and L. sakei AMBR8 on epithelial integrity was investigated in vitro in primary nasal epithelial cells (pNECs) from healthy controls and patients with CRSwNP as well as in vivo in a murine model of interleukin (IL)-4 induced barrier dysfunction. The activation of Toll-like receptor 2 (TLR2) was explored in vitro by using polyclonal antibodies. Results Patients with CRSwNP had a defective epithelial barrier which positively correlated with the relative abundance of lactobacilli-specific amplicons in the maxillary sinus. L. casei AMBR2, but not L. sakei AMBR8, increased the trans-epithelial electrical resistance (TEER) of pNECs from CRSwNP patients in a time-dependent manner. Treatment of epithelial cells with L. casei AMBR2 promoted the tight junction proteins occludin and zonula occludens-1 reorganization. Furthermore, L. casei AMBR2 prevented IL-4-induced nasal permeability in vivo and in vitro. Finally, the beneficial effect of L. casei AMBR2 on nasal epithelial cells in vitro was TLR2-dependent as blocking TLR2 receptors prevented the increase in TEER. Conclusions A defective epithelial barrier in CRSwNP may be associated with a decrease in relative abundance of lactobacilli-specific amplicons. L. casei AMBR2 would restore nasal epithelial integrity and can be a novel therapeutic strategy for CRSwNP.
Lifting a Metadata Model to the Semantic Multimedia World
Martens, Gaetan,Verborgh, Ruben,Poppe, Chris,Van De Walle, Rik Korea Information Processing Society 2011 Journal of information processing systems Vol.7 No.1
This paper describes best-practices in lifting an image metadata standard to the Semantic Web. We provide guidelines on how an XML-based metadata format can be converted into an OWL ontology. Additionally, we discuss how this ontology can be mapped to the W3C's Media Ontology. This ontology is a standardization effort of the W3C to provide a core vocabulary for multimedia annotations. The approach presented here can be applied to other XML-based metadata standards.
How to tackle congestion in acute heart failure
( Pieter Martens ),( Wilfried Mullens ) 대한내과학회 2018 The Korean Journal of Internal Medicine Vol.33 No.3
Acute heart failure is a common complication of chronic heart failure and is associated with a high risk for subsequent mortality and morbidity. In 90% of case acute heart failure is the resultant of congestion, a manifestation of fluid build-up due to increased filling pressures. As residual congestion at discharge following an acute heart failure episodes is one of the strongest predictors of poor outcome, the goal of therapy should be to resolve congestion completely. Important to comprehend is that increased cardiovascular filling pressures are not solely the resultant of intravascular volume excess but can also be induced by a decreased venous capacitance. This review article focusses on the pathophysiology, diagnoses, and treatment of congestion in acute heart failure. A clear distinction is made between states of volume overload (intravascular volume excess) or volume redistribution (decreased venous capacitance) contributing to congestion in acute heart failure.
Lifting a Metadata Model to the Semantic Multimedia World
( Gaetan Martens ),( Ruben Verborgh ),( Chris Poppe ),( Rik Van De Walle ) 한국정보처리학회 2011 Journal of information processing systems Vol.7 No.1
This paper describes best-practices in lifting an image metadata standard to the Semantic Web. We provide guidelines on how an XML-based metadata format can be converted into an OWL ontology. Additionally, we discuss how this ontology can be mapped to the W3C`s Media Ontology. This ontology is a standardization effort of the W3C to provide a core vocabulary for multimedia annotations. The approach presented here can be applied to other XML-based metadata standards.
매립지 가스 처분기준, 문제, 해결방안, 과정의 분야에서 15년간의 실험
( Juergen Martens ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
15-20년 전, 매립가스(LFG)의 처분이 처음으로 공식적인 주제로 시작되었을 때, 이러한 분야의 연구는 거의 이뤄지지 않았다. 많은 것들은 오늘날 매립가스 기술의 분야에서 이루어졌다. 예를 들면, 과거로부터 종종 발생하는 초기의 실수는 기초적인 데이터의 부족하에, 과대한 가스 이용설비의 설계 또는 균일하지 않은 매립지의 안정화를 계산하지 않은 가스 수집 시스템의 중대한 결점이다. 식물공학의 관점에서, 여전히 오늘날에도 정교한 노하우와 중대한 주의가 필요한 어려움이 있다. 본 논문은 해를 거듭하면서, 매립지 가스 기술의 발전을 관찰하였다. 또한, 오늘날 실험의 어려움을 언급한다. 15-20 years ago, when the disposal of landfill gas (LFG) first started to become a public issue, only little experience had been gained in this field. Much has been achieved by now if we look at today’s state-of- the-art in landfill gas engineering. Initial errors often made in the past included, for instance, the construction of oversized gas utilization facilities due to a lack of fundamental data, or major damage to gas collection systems, because uneven landfill settlement was not taken into account. From the point of view of plant engineers, even today there are still difficulties that require special attention and sophisticated know-how. This paper provides an overview on the developments in landfill gas engineering throughout the years. It also refers to the difficulties experienced today.
Christian Martens,Jochen Schuttler,Axel Graser 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2003 International Journal of Assistive Robotics and Me Vol.4 No.2
Service robots and especially rehabilitation robots shall support disabled persons in daily life situations as well as in the working environment. Currently available systems offer support on a relatively low task level. This puts a high cognitive load on its users, so that controlling these systems turns out to be very tiresome. In order to eliminate this disadvantage system control on a higher task level becomes a necessary prerequisite. For this purpose, detailed information about the task to be solved i.e. task-knowledge has to be supported. This kind of information enables the system to reason about its internal as well as about its environmental state in a (semi-)autonomous manner. This paper presents an approach for the logical verification of the input of such task-knowledge. The task-knowledge is represented on the basis of AND/OR-net structures. These net structures can be created easily by non-service robotic experts (application programmer e.g. care personnel). The logical verification during knowledge input on a semantic level becomes possible due to the enhanced a priori knowledge about the net elements (i.e. objects and operators) and their relationships.