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Marquardt, J.U.,Seo, D.,Andersen, J.B.,Gillen, M.C.,Kim, M.S.,Conner, E.A.,Galle, P.R.,Factor, V.M.,Park, Y.N.,Thorgeirsson, S.S. Elsevier Science Publishers 2014 Journal of hepatology Vol.60 No.2
Background & Aims: Human hepatocarcinogenesis is as a multi-step process starting from dysplastic lesions to early carcinomas (eHCC) that ultimately progress to HCC (pHCC). However, the sequential molecular alterations driving malignant transformation of the pre-neoplastic lesions are not clearly defined. This lack of information represents a major challenge in the clinical management of patients at risk. Methods: We applied next-generation transcriptome sequencing to tumor-free surrounding liver (n=7), low- (n=4) and high-grade (n=9) dysplastic lesions, eHCC (n=5) and pHCC (n=3) from 8 HCC patients with hepatitis B infection. Integrative analyses of genetic and transcriptomic changes were performed to characterize the genomic alterations during hepatocarcinogenesis. Results: We report that changes in transcriptomes of early lesions including eHCC were modest and surprisingly homogenous. Extensive genetic alterations and subsequent activation of prognostic adverse signaling pathways occurred only late during hepatocarcinogenesis and were centered on TGFβ, WNT, NOTCH, and EMT-related genes highlighting the molecular diversity of pHCC. We further identify IGFALS as a key genetic determinant preferentially down-regulated in pHCC. Conclusions: Our results define new hallmarks in molecular stratification and therapy options for patients at risk for HCC, and merit larger prospective investigations to develop a modified clinical-decision making algorithm based on the individualized next-generation sequencing analyses.
High performance switched reluctance drives with wide field weakening range
Rainer Marquardt,Marc Hiller 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
For electrical vehicles, switched reluctance drives present a promising alternative - compared to asynchronous and synchronous (permanent magnet) concepts. For these applications, a very wide field weakening range is a key issue. Other requirements include high torque output from a small machine and low current ripple at the DC-side without the use of bulky filters - when powered from fuel cells or advanced Lithium-Ion-batteries. A new converter and control strategy according to these requirements is presented and compared to existing designs. The comparison is done for a drive system with a continuous power rating of 30 to 40 kW.<br/>
Modular Multilevel Converter Topologies with DC-Short Circuit Current Limitation
Rainer Marquardt 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Demanding future applications in power transmission and drives ? like solar-thermic power plants and off-shore wind power ? require advanced converter systems. Modular Multilevel Converters are well adopted to these needs, owing to industrial scalability, high efficiency and fast dynamic controllability under transient and fault conditions ? including DC-Side faults. The respective features of the established concepts for the high power range (M2C) and of new concepts for the low power range (MHF) are explained.
Gamasid mite assemblage on mountain fire sites
Chuleui Jung,Tomasz Marquardt,Slawomir Kaczmarek,Hoonbok Yi 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Gamasid mites are free living predators of soil mites, collembolans, nematodes and other small insects in soil surface. We studied the faunal assemblages of gamasid mites in the severely disturbed mountain sites by fire. Total 12 families 55 species were found from this study. From all sites, species in the family of Parholaspidae were dominant; Holaspina alstoni and H. dentatus. Also, Rhodacarus dentitulatus was also abundant regardless of fire disturbance. In control site, Asca aphidioides was also abundant but not in any of the fire disturbed sites. The abundance was highest in control site followed by IC2, IT3 and lower in IT2 and IT1. Species richness was in the same order of abundance ranging from 2.6 to 12.8 per site. In all sites, species diversities were relatively low ranging from 0.6 to 1.7, but it was higher in control site and lower in IT1. Further discussion will be made on the recovery process of soil inhabiting mites.
Kaczmarek, Slawomir,Marquardt, Tomasz Korean Society of Applied Entomology 2006 Journal of Asia-Pacific Entomology Vol.9 No.3
The mesostigmatid mites speciation of the family Zerconidae in the Korean Peninsula was analysed in relation to the range of this group in the world. The Korean Peninsula is located on the edge of the Holarctic and is characterised by a uniquely diversified climate shaping the longitudinally changing flora. At present, there are altogether 40 genera included in the family Zerconidae. So far, in the Korean Peninsula there have been recognised 18 species of the Zerconidae belonging to 11 genera. The endemic genera within the area include: Metazercon, Eurozercon, Xenozercon, Koreozercon, Kaikiozercon, Aquilonozercon, and cf. Mesozercon gen. nov. A very high level of endemism (over 60%) proves the intensity of the speciation processes within the Zerconidae family on the Korean Peninsula.
Sławomir Kaczmarek,Tomasz Marquardt 한국응용곤충학회 2006 Journal of Asia-Pacific Entomology Vol.9 No.3
The mesostigmatid mites speciation of the family Zerconidae in the Korean Peninsula was analysed in relation to the range of this group in the world. The Korean Peninsula is located on the edge of the Holarctic and is characterised by a uniquely diversified climate shaping the longitudinally changing flora. At present, there are altogether 40 genera included in the family Zerconidae. So far, in the Korean Peninsula there have been recognised 18 species of the Zerconidae belonging to 11 genera. The endemic genera within the area include: Metazercon, Eurozercon, Xenozercon, Koreozercon, Kaikiozercon, Aquilonozercon, and cf. Mesozercon gen. nov. A very high level of endemism (over 60%) proves the intensity of the speciation processes within the Zerconidae family on the Korean Peninsula.
Susanne Sinz,Svenja Marquardt,Carla R. Soliva,Ueli Braun,Annette Liesegang,Michael Kreuzer 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.7
Objective: The methane mitigating potential of various plant-based polyphenol sources is known, but effects of combinations have rarely been tested. The aim of the present study was to determine whether binary and 3-way combinations of such phenol sources affect ruminal fermentation less, similar or more intensively than separate applications. Methods: The extracts used were from Acacia mearnsii bark (acacia), Vitis vinifera (grape) seed, Camellia sinensis leaves (green tea), Uncaria gambir leaves (gambier), Vaccinium macrocarpon berries (cranberry), Fagopyrum esculentum seed (buckwheat), and Ginkgo biloba leaves (ginkgo). All extracts were tested using the Hohenheim gas test. This was done alone at 5% of dry matter (DM). Acacia was also combined with all other single extracts at 5% of DM each, and with two other phenol sources (all possible combinations) at 2.5%+2.5% of DM. Results: Methane formation was reduced by 7% to 9% by acacia, grape seed and green tea and, in addition, by most extract combinations with acacia. Grape seed and green tea alone and in combination with acacia also reduced methane proportion of total gas to the same degree. The extracts of buckwheat and gingko were poor in phenols and promoted ruminal fermentation. All treatments except green tea alone lowered ammonia concentration by up to 23%, and the binary combinations were more effective as acacia alone. With three extracts, linear effects were found with total gas and methane formation, while with ammonia and other traits linear effects were rare. Conclusion: The study identified methane and ammonia mitigating potential of various phenolic plant extracts and showed a number of additive and some non-linear effects of combinations of extracts. Further studies, especially in live animals, should concentrate on combinations of extracts from grape seed, green tea leaves Land acacia bark and determine the ideal dosages of such combinations for the purpose of methane mitigation.
Species richness of soil gamasid mites (Acari: Mesostigmata) in fire-damaged mountain sites
정철의,Ji Won Kim,Tomasz Marquardt,Slawomir Kaczmarek 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.3
Gamasid mites are important regulators of soil food webs in forest ecosystems. Wildfire is a dominant disturbance factor in forest ecosystems. We assessed the impact of fire on the species composition of soil gamasid mites at mountain sites following fires of four different degrees of severity and at one control site (5 years post-fire). In total, 14 families, 28 genera, and 54 species or species complexes were found. The abundance and richness were poor in severely burned sites compared to the less damaged sites. The different species compositions, especially in the medium-burned site, require further ecological study to improve our understanding. The fire response and recovery processes of selected species are also discussed.
Species richness of soil gamasid mites (Acari: Mesostigmata) in fire-damaged mountain sites
Jung, Chul-Eui,Kim, Ji-Won,Marquardt, Tomasz,Kaczmarek, Slawomir 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol. No.
Gamasid mites are important regulators of soil food webs in forest ecosystems. Wildfire is a dominant disturbance factor in forest ecosystems. We assessed the impact of fire on the species composition of soil gamasid mites at mountain sites following fires of four different degrees of severity and at one control site (5 years post-fire). In total, 14 families, 28 genera, and 54 species or species complexes were found. The abundance and richness were poor in severely burned sites compared to the less damaged sites. The different species compositions, especially in the medium-burned site, require further ecological study to improve our understanding. The fire response and recovery processes of selected species are also discussed.