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Juicy Stories on Female Reproductive Tissue Development: Coordinating the Hormone Flows

Journal of Integrative Plant Biology 2013年第9期55卷 847-863页

作者： veronica a.grieneisen Athanasius F.M.Marée Lars φstergaard Computational and Systems Biology John Innes Centre Norwich Research ParkNorwich NR4 7UH UK Crop Genetics John Innes Centre Norwich Research ParkNorwich NR4 7UH UK

In the past 20-30 years, developmental biologists have made tremendous progress in identifying genes required for the specifica-tion of individual cell types of an organ and in describing how they interact in genetic networks. In comparison, very little is known about the mechanisms that regulate tissue polarity and overall organ patterning. Gynoecia and fruits from members of the Brassicaceae family of flowering plants provide excellent model systems to study organ patterning and tissue specification because they become partitioned into distinct domains whose formation is determined by polarity establishment both at a cellular and whole tissue level. Interactions among key regulators of Arabidopsis gynoecium and fruit development have revealed a network of upstream transcription factor activities required for such tissue differentiation. Regulation of the plant hormone auxin is emerging as both an immediate downstream output and input of these activities, and here we aim to provide an overview of the current knowledge regarding the link between auxin and female reproductive development in plants. In this review, we will also demonstrate how available data can be exploited in a mathematical modeling approach to reveal and understand the feedback regulatory circuits that underpin the polarity establishment, necessary to guide auxin flows.

关键词： Auxin dynamics brassicaceae cell and tissue polarity fruit gynoecium mathematical modelling organ patterning ROPs wavepinning

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Systems Biology Approach Pinpoints Minimum Requirements for Auxin Distribution during Fruit Opening

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Molecular Plant 2019年第6期12卷 863-878页

作者： Xin-Ran Li Renske M.A.Vroomans Samantha Fox veronica a.grieneisen Lars Φstergaard Athanasius F.M.Maree Crop Genetics John Innes Centre Norwich NR4 7UH UK Computational and Systems Biology John Innes Centre Norwich NR4 7UH UK Centre of Excellence in Computational and Experimental Developmental Biology Institute of Biotechnology University of Helsinki 00014 Helsinki Finland Cell and Developmental Biology John Innes Centre Norwich NR4 7UH UK School of Biosciences Cardiff University Cardiff CF10 3AX Wales UK

The phytohormone auxin is implied in steering various developmental decisions during plant morphogenesis in a concentration-dependent *** maxima have been shown to maintain meristematic activity,for example,of the root apical meristem,and position new sites of outgrowth,such as during lateral root initiation and *** recently,it has been demonstrated that sites of auxin minima also provide positional *** the developingArabidopsis fruit,auxin minima are required for correct differentiation of the valve *** remains unclear,however,how this auxin minimum is generated and ***,we employ a systems biology approach to model auxin transport based on experimental *** allows us to determine the minimal requirements for its *** simulations reveal that two alternative processes-which we coin "flux-barrier" and "flux-passage"-are both able to generate an auxin minimum,but under different parameter *** models are in principle able to yield similar auxin profiles but present qualitatively distinct patterns of auxin *** models were tested by tissue-specific inducible ablation,revealing that the auxin minimum in the fruit is most likely generated by a flux-passage *** predictions were further supported through 3D PIN localization imaging and implementing experimentally observed transporter *** such an experimental-modeling cycle,we predict how the auxin minimum gradually matures during fruit development to ensure timely fruit opening and seed dispersal.

关键词： auxin mathematical modeling polar auxin transport fruit development systems biology of patterning

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Data augmentation for bias correction in mapping PM_(2.5) based on satellite retrievals and ground observations

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Geoscience Frontiers 2024年第1期15卷 17-28页

作者： Tan Mi Die Tang Jianbo Fu Wen Zeng Michael L.grieneisen Zihang Zhou Fengju Jia Fumo Yang Yu Zhan College of Carbon Neutrality Future Technology Sichuan UniversityChengduSichuan 610065China Department of Environmental Science and Engineering Sichuan UniversityChengduSichuan 610065China Institute for Disaster Management and Reconstruction Sichuan UniversityChengduSichuan 610200China Department of Land Airand Water ResourcesUniversity of CaliforniaDavisCA 95616United States Chengdu Academy of Environmental Sciences ChengduSichuan 610072China Sichuan Chengdu Ecological and Environment Monitoring Center ChengduSichuan 610011China

As most air quality monitoring sites are in urban areas worldwide,machine learning models may produce substantial estimation bias in rural areas when deriving spatiotemporal distributions of air *** bias stems from the issue of dataset shift,as the density distributions of predictor variables differ greatly between urban and rural *** propose a data-augmentation approach based on the multiple imputation by chained equations(MICE-DA)to remedy the dataset shift *** with the benchmark models,MICE-DA exhibits superior predictive performance in deriving the spatiotemporal distributions of hourly PM2.5 in the megacity(Chengdu)at the foot of the Tibetan Plateau,especially for correcting the estimation bias,with the mean bias decreasing from-3.4µg/m3 to-1.6µg/*** a complement to the holdout validation,the semi-variance results show that MICE-DA decently preserves the spatial autocorrelation pattern of PM2.5 over the study *** essence of MICE-DA is strengthening the correlation between PM2.5 and aerosol optical depth(AOD)during the data ***,the importance of AOD is largely enhanced for predicting PM2.5,and the summed relative importance value of the two satellite-retrieved AOD variables increases from 5.5%to 18.4%.This study resolved the puzzle that AOD exhibited relatively lower importance in local or regional *** results of this study can advance the utilization of satellite remote sensing in modeling air quality while drawing more attention to the common dataset shift problem in data-driven environmental research.

关键词： Aerosol optical depth Dataset shift Spatiotemporal Distribution Air quality monitoring Multiple imputation by chained equations

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IMPLEMENTATION OF COLORIMETRIC MEASUREMENT SYSTEM AT INMETRO

IMPLEMENTATION OF COLORIMETRIC MEASUREMENT SYSTEM AT INMETRO

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26th Session of the CIE

作者： J.F.S.Gomes G.S.Araǘjo H.P.grieneisen I.B.Couceiro Brazilian National Institute of Metrology-INMETRO Optical Metrology Division-DIOPT Radiometry Laboratory-LARAD Av.N.Sra.das Graas 50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil Brazilian National Institute of Metrology-INMETRO Optical Metrology Division-DIOPT Radiometry Laboratory-LARAD Av.N.Sra.das Graas 50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil Brazilian National Institute of Metrology-INMETRO Optical Metrology Division-DIOPT Radiometry Laboratory-LARAD Av.N.Sra.das Graas 50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil Brazilian National Institute of Metrology-INMETRO Optical Metrology Division-DIOPT Radiometry Laboratory-LARAD Av.N.Sra.das Graas 50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil

＜正＞The Radiometry Laboratory of Brazilian National Institute of Metrology,according CIE standards, has implemented a setup for colorimetric materials and color tile characterization with high *** the main purpose to check the preliminary performance of the reference system two sets of ceramic color standards were obtained and the characterization of the samples has been done using a PR-650 Photoresearch *** reflectance measurements are done for the common configuration of illumination and observation geometry,0/45,for colorimetric characterization of color tiles.

关键词： colorimetry colorimetric measurements material characterization

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COMPLIANCE AND TESTING OF HID-LAMPS FOR MINIMUM LUMINOUS FLUX LEVELS

COMPLIANCE AND TESTING OF HID-LAMPS FOR MINIMUM LUMINOUS FLU...

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26th Session of the CIE

作者： A.S.P.Timmins C.T.Coelho H.P.H.grieneisen I.A.Oliveira I.B.Couceiro National Institute of Metrology Standardization and Industrial Quality-Inmetro Optical Metrology Division-Diopt Photometry Laboratory-Lafot Av.N.Sra.das Graas50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil National Institute of Metrology Standardization and Industrial Quality-Inmetro Optical Metrology Division-Diopt Photometry Laboratory-Lafot Av.N.Sra.das Graas50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil National Institute of Metrology Standardization and Industrial Quality-Inmetro Optical Metrology Division-Diopt Photometry Laboratory-Lafot Av.N.Sra.das Graas50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil National Institute of Metrology Standardization and Industrial Quality-Inmetro Optical Metrology Division-Diopt Photometry Laboratory-Lafot Av.N.Sra.das Graas50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil National Institute of Metrology Standardization and Industrial Quality-Inmetro Optical Metrology Division-Diopt Photometry Laboratory-Lafot Av.N.Sra.das Graas50-Xerém-Duque de CaxiasRJCEP 25250-020Brazil

＜正＞The lamps manufactures in Brazil have a demand to determining minimum luminous flux performance of high intensity discharge lamps - HID using integrating sphere photometers.A method is presented here to measured HID lamps of different lamp types,such as sodium,metal vapor and mercury lamps,each exhibiting a different emission spectrum using two different methodologies:with an integrating sphere and a ***,we are going to compare the found results and determine the best methodology to be used by the industry.

关键词： luminous flux goniophotometry HID-lamp

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