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Bed diversity in the shallow water environment of Pappas lagoon in greece

International Journal of Sediment Research 2012年第1期27卷 1-17页

作者： g.papatheodorou P.AVRAMIDIS E.FAKIRIS D.CHRISTODOULOU N.KONTOPOULOS Laboratory of Marine geology and Physical Oceanography Department of GeologyUniversity of Patras Technological Educational-Institute of Messolonghi Department of Aquaculture and Fisheries Management 3. Research ScientistLaboratory of Marine Geology and Physical OceanographyDepartment of GeologyUniversity of Patras 4. Laboratory of SedimentologyDepartment of GeologyUniversity of Patras

Acoustic classification systems and the Sediment Trend Analysis method were used to identify and map the bed diversity in a very shallow(<3.0m),coastal lagoon,Pappas lagoon,Western greece. Analogue acoustic data,colle... 详细信息

Acoustic classification systems and the Sediment Trend Analysis method were used to identify and map the bed diversity in a very shallow(goon,Pappas lagoon,Western greece. Analogue acoustic data,collected by means of a 100 kHz side scan sonar system,were digitized and classified into six acoustic classes using recently developed acoustic classification systems (SonarClass,TargAn).By comparing the acoustic classes to ground truth data consisting of sediment grain size and visual inspection of the lagoon-bed,it is demonstrated that the six acoustic classes correlate well with the predominant surface sediment types and *** the spatial distribution of the classes can be considered to represent the spatial pattern of the sedimentary assemblages of the *** grain size trend analysis identified three dominant sediment pathways and directional trends which could be related to the predominant wind direction,the sediment influx through the inlets and the sediment supply from a small stream in the southern part of the *** integration of acoustic and sedimentological data together with advanced data processing systems leads to a better understanding of the sedimentary,morphological and biological processes in a shallow lagoon in different spatial and temporal scales and will therefore be beneficial to both sedimentological and biotic-diversity studies.

关键词： Trend sediment analysis Side scan sonar grain size Acoustic classification ground truthing

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Recurring heavy rainfall resulting in degraded-upgraded phases in soil microbial networks that are reflected insoil functioning

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Soil Ecology Letters 2023年第3期5卷 75-88页

作者： george P.Stamou Nikolaos Monokrousos Anastasia Papapostolou Effimia M.papatheodorou Department of Ecology School of BiologyAristotle UniversityThessaloniki 54124Greece University Center of International Programmes of Studies International Hellenic UniversityThessaloniki 57001Greece

Biological soil crusts(BSCs)are an important multi-trophic component of arid ecosystems in the Mediterranean *** a mesocosm experiment,the authors investigated how the network of interactions among the members of the soil microbial communities in four types of soil sample responded when soils were exposed to two simulated extreme rain *** four types of soil samples were:covered by Cladonia rangiformis and previously hydrated(+BSC+H),covered by *** and dried(+BSC-H),uncovered and hydrated(-BSC+H),uncovered and dried(-BSC-H).Network analysis was based on the co-occurrence patterns of microbes;microbes were assessed by the phospholipid fatty acids *** authors further explored the relations between networks’metrics and soil functions denoted by enzymatic activity and soil chemical *** networks exhibited Small world properties,moderate values of clustering coefficient and eigen centrality,indicating the lack of hub *** networks in-BSC-H soils appeared coherent during the pre-rain phases and they became modular after rains,while those in+BSC-H soils kept their connectivity till the second rain but this then *** network metrics that were indicative of cohesive networks tended to be related to enzyme activity while those that characterized the loose networks were related to Ca,K,Mg,NH_(4)^(+) and organic *** all mesocosms except for+BSC-H,networks’fragmentation after the second heavy rain was milder than after the first one,supporting the idea of community *** response of microbial networks to heavy rains was characterized by the tendency to exhibit degradation-reconstruction *** network collapse in the crusted only mesocosms showed that the communities beneath crusts in arid areas were extremely vulnerable to recurring heavy rain events.

关键词： PLFAs Cladonia rangiformis biocrust soil microbial community network metrics

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Bacterial community in response to packaging conditions in farmed gilthead seabream

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Aquaculture and Fisheries 2023年第4期8卷 410-421页

作者： Apollon Thomas Spyros J.Konteles Sotiris Ouzounis Spyros papatheodorou Aliki Tsakni Dimitra Houhoula Theofania Tsironi Department of Food Science and Technology Faculty of Food SciencesUniversity of West AtticaAthens11521Greece Medical Image and Signal Processing Laboratory Department of Biomedical EngineeringUniversity of West AtticaAthens11521Greece Laboratory of Food Process Engineering Department of Food Science and Human NutritionAgricultural University of AthensAthens11855Greece

The objective of this study was to evaluate the effect of modified atmosphere packaging(MAP)on fish skin,gills and intestines bacterial *** gilthead seabream was packed aerobically or under modified atmospheres(60%CO_(2),30%N_(2),10%O_(2))and stored isothermally at 0℃.Next generation Sequencing(NgS)analysis was applied for the characterization of fish microbiome on fish skin,gills,and intestines initially(time of packaging,1 day after harvesting)and after 10 days of isothermal storage at 0℃.NgS results indicated statistically significant differences in families’richness and diversity in the tested fish tissues between aerobic and MAP packaging during storage at 0℃.The most persistent bacteria were Proteobacteria for both packaging *** fish skin microbiota,the initially prevailing families were Comamonadaceae,Enterobacteriaceae and Moraxellaceae while in the intestines Comamonadaceae,Anaplasmataceae,Bacillaceae and Enterobacteriaceae were the dominant *** the end of storage period,the fish microbiota was dominated by psychotropic and psychrophilic families(Pseudoalteromonadaceae,Psychromonadaceae,and Shewanellaceae),while families such as Comamonadaceae were persistent under MAP *** 8 days of fish storage at 0℃,МАРsamples exhibited higher sensory scorings than the respective aerobically stored fish,indicating better retention of fish freshness and fish quality attributes under *** on the results of the study,MAP modified significantly the microbiological status and extended the shelf life of *** was a powerful tool that provided a more complete assessment compared to a culture-based analysis.

关键词： Fish Preservation Next generation sequencing Modified atmosphere packaging Microbiome

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优化密封件摩擦

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现代制造 2009年第4期 44-45页

作者： Thomas papatheodorou

密封件的摩擦,尤其是密封件引起的迟滞爬行现象可通过改变材料的化学成分有目的的施加影响。在改变密封件材料的过程中,设计人员必须牢牢把握密封件磨损和挤压性能的变化。

关键词：密封件材料摩擦优化化学成分爬行现象挤压性能设计人员

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gIS-aided simulation of pollutant distribution in marine sediments in greece: Spatial patterns and origin

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Chinese Journal Of geochemistry 2006年第B8期25卷 252-252页

作者： Katerina Kostakis E.M. Skordaki g. papatheodorou g. Ferentinos I. georgoudis Department of Civil Engineering Technological Education Institute （TEI） of Piraeus 12244 Egaleo Greece Laboratory of Marine geology and Physical Oceanography Dept. of Geology Univ. of Patras 26500 Patras Greece

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