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从植物科学到农业发展——2012全国植物生物学大会

作者： Krzysztof Wabnik Stephan Pollmann Steffen Vanneste willy govaerts Jakub Rolcik Markus Geisler Jiri Friml Department of Plant Systems Biology VIB and Department of Plant Biotechnology and GeneticsGhent UniversityB-9052 GentBelgium Ruhr-Universitt Bochum Lehrstuhl für Pflanzenphysiologie44801 Bochum Germany Department of Applied Mathematics and Computer Science Ghent University9000 GentBelgium Laboratory of Growth Regulators Centre of the Region Hana for Biotechnological and Agricultural Research and Faculty of SciencePalacky University78371 OlomoucCzech Republic Department of Biology Plant BiologyUniversity of Fribourg1700 FribourgSwitzerland

In plants,the patterning of root meristem requires a gradient-guided auxin maximum that depends on the concerted action of polar auxin transport,auxin biosnythesis and intracellular auxin ***,mechanisms underlying this auxin gradient dependent root patterning are not fully ***,we present unexpected evidence that the activity of WUSCHEL-RELATED HOMEOBOX 5(WOX5) transcription factor modulates free auxin production in the quiescent center(QC) of the root and thus assures the maintenance of auxin maximum in the root ***,WOX5 expression is inhibited in a feedback-dependent manner by canonical auxin signaling that involves indole-3-acetic acid 17(IAA17) auxin response ***,we used loss-of-function and gain-of-function mutant analysis complemented by computer simulation study to identify and test the novel feedback mechanism that links WOX5-dependent auxin production to IAA17-mediated cellular auxin *** findings demonstrate that this feedback circuit is essential for the maintenance of auxin gradient in the root tip and the auxin-mediated root distal stem cell(DSC) differentiation.

关键词： WOX5 auxin IAA17/AXR3 root patterning computer simulation.

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Effects of Tillage and Crop Residue Management on Maize Yields and Net Returns in the Central Mexican Highlands Under Drought Conditions

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Pedosphere 2014年第4期24卷 476-486页

作者： R.ROMERO-PEREZGROVAS N.VERHULST D.DE LA ROSA V.HERNáNDEZ M.MAERTENS J.DECKERS B.govaerts International Maize and Wheat Improvement Center(CIMMYT) P.O.Box 6-641Mexico D.F.06600(Mexico) Department of Earth and Environmental Sciences University of LeuvenCelestijnenlaan 200 ELeuven 3001(Belgium) Mathematics Research Center(CIMAT) Jalisco S/NValencianaGuanajuatoMexico CP 36240(Mexico)

In the subtropical highlands of Central Mexico, where the main crop is maize （Zea mays）, the conventional practice （CP） involves tillage, monoculture and residue removal, leading to soil degradation and unsustainable use of natural resources and agricultural inputs. Conservation agriculture （CA） has been proposed as a viable alternative in the region, based on reduction in tillage, retention of adequate levels of crop residues and soil surface cover and use of crop rotation. This study began in 2009 when the highlands of Central Mexico suffered from a prolonged drought during vegetative maize growth in July-August, providing an opportunity for the on-farm comparison of CA with CP under severe drought conditions which 21 climate change models projected to become more frequent. Under dry conditions, CA resulted in higher yields and net returns per hectare as early as the first and second years after adoption by farmers. As an average of 27 plots under farmers＇ management in 2009, the maize yields were 26% higher under CA （6.3 t ha-1） than under CP （5.0 t ha-l）. 2010 was close to a normal year in terms of rainfall so yields were higher than in 2009 for both practices; in addition, the yield difference between the practices was reduced to 19% （6.8 t ha-1 for CA vs. 5.7 t ha-1 for CP）. When all the 2009 and 2010 observations were analyzed in a modified stability analysis, CA had an overall positive effect of 3 838 Mexican Pesos ha-1 （320 $US ha-1） on net return and 1.3 t ha-1 on yield. After only one to two years of adoption by farmers on their fields, CA had higher yields and net returns under dry conditions that were even drier than those predicted by the analyzed 21 climate change models under a climate change scenario, emission scenario A2.

关键词： climate change conservation agriculture conventional practice emission scenario modified stability analysis

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依据对一个人造物体的角度测量,评价一个三维辐射传输模型(英文)

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遥感学报 1997年第S1期1卷 139-144页

作者： YvesM.govaerts MichelM.Verstreate BrianHosgood

该文基于蒙特卡洛光线追踪技术评价一个新的三维不均匀介质的辐射传输模型，这一模型是按一个虚拟实验室来构思的。在这个实验室中可以把多个物体分别表征，并可以显示控制辐射场与这些物体的相互作用。对于任意复杂的三维物体，此模型... 详细信息

该文基于蒙特卡洛光线追踪技术评价一个新的三维不均匀介质的辐射传输模型，这一模型是按一个虚拟实验室来构思的。在这个实验室中可以把多个物体分别表征，并可以显示控制辐射场与这些物体的相互作用。对于任意复杂的三维物体，此模型都可以用来产生反射及吸收的纵剖面图，例如一片植物的叶子或是一个完整的森林冠层。通过对一个人造物体的模型仿真及实验测量结果的比较，我们评估了这一模型的性能。空间应用研究所的高技术利用室利用欧洲测角计（ＥＧＯ）设备进行了观测，与实验室的测量比较表明我们的模型可以再生一个与实际相符合的物体的实际观测反射因子，甚至可以表征实验室的性能。

关键词：蒙特卡洛光线追踪测角计测量辐射传输建模

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Structural analysis of a nanoparticle containing a lipid bilayer used for detergent-free extraction of membrane proteins

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Nano Research 2015年第3期8卷 774-789页

作者： Mohammed Jamshad Vinciane Grimard Ilaria Idini Tim J. Knowles Miriam R. Dowle Naomi Schofield Pooja Sridhart Yupin Lin Rachael Finka Mark Wheatley Owen R. T. Thomas Richard E. Palmerr Michael Overduin Cedric govaerts Jean-Marie Ruysschaert Karen J. Edler Tim R. Dafforn School of Biosciences University of Birmingham Edgbaston Birmingham B 15 2TT UK Universite Libre de Bruxelles SFMB - CP206/2 Bd. du Triomphe Acces 2 1050 Bruxelles Belgium Department of Chemistry University of Bath Claverton Down Bath BA2 7AY UK School of Cancer Studies University of Birmingham Edgbaston Birmingham B 15 2 TT UK Nanoscale Physics Research Laboratory and PSIBS School of Physics and Astronomy University of Birmingham Edgbaston Birmingham B 15 2TT UK School of Chemical Engineering University of Birmingham Edgbaston Birmingham B 15 2TT UK

In the past few years there has been a growth in the use of nanoparticles for stabilizing lipid membranes that contain embedded proteins. These bionanoparticles provide a solution to the challenging problem of membrane protein isolation by maintaining a lipid bilayer essential to protein integrity and activity. We have previously described the use of an amphipathic polymer （poly（styrene-co-maleic add）, SMA） to produce discoidal nanoparticles with a lipid bilayer core containing the embedded protein. However the structure of the nanoparticle itself has not yet been determined. This leaves a major gap in understanding how the SMA stabilizes the encapsulated bilayer and how the bilayer relates physically and structurally to an unencapsulated lipid bilayer. In this paper we address this issue by describing the structure of the SMA lipid particle （SMALP） using data from small angle neutron scattering （SANS）, electron microscopy （EM）, attenuated total reflection Fourier transform infrared spectroscopy （ATR-FTIR）, differential scanning calorimetry （DSC） and nuclear magnetic resonance spectroscopy （NMR）. We show that the particle is disc shaped containing a polymer ＂bracelet＂ encircling the lipid bilayer. The structure and orientation of the individual components within the bilayer and polymer are determined showing that styrene moieties within SMA intercalate between the lipid acyl chains. The dimensions of the encapsulated bilayer are also determined and match those measured for a natural membrane. Taken together, the description of the structure of the SMALP forms the foundation for future development and applications of SMALPs in membrane protein production and analysis.

关键词： nanoparticles lipid polymer membrane proteins structure detergent

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Prognostic value of ^(18)F-FDG PET/CT in liver transplantation for hepatocarcinoma

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World Journal of Gastroenterology 2015年第10期21卷 3049-3054页

作者： Olivier Detry Laurence govaerts Arnaud Deroover Morgan Vandermeulen Nicolas Meurisse Serge Malenga Noella Bletard Charles Mbendi Anne Lamproye Pierre Honoré Paul Meunier Jean Delwaide Roland Hustinx Department of Abdominal Surgery and Transplantation CHU LiegeB4000 LiegeBelgium Department of Nuclear Medicine CHU Liege University of Liege ULg CHU B4000 LiegeBelgium Department of Radiology CHU LiegeUniversity of LiegeULg CHUB4000 LiegeBelgium Department of Pathology CHU LiegeUniversity of LiegeULg CHUB4000 LiegeBelgium Department of Hepato-Gastroenterology CHU LiegeUniversity of LiegeULg CHUB4000 LiegeBelgium

AIM:To evaluate the prognostic value of pretreatment F D G p o s i t r o n e m i s s i o n t o m o g ra p h y c o m p u t e d tomography(PET-CT) in patients with hepatocarcinoma treated by liver transplantation(LT).METHODS:The authors retrospectively analyzed the data of 27 patients(mean age 58 ± 9 years) who underwent FDG PET-CT before LT for *** follow-up was 26 ± 18 *** FDG PET/CT was performed according to a standard clinical protocol:4 MBq FDG/kg body weight,uptake 60 min,low-dose non-enhanced *** authors measured the SUVmax and SUVmean of the tumor and the normal *** tumor/liver activity ratios(RSUVmax and RSUVmean) were tested as prognostic factors and compared to the following conventional prognostic factors:MILAN,CLIP,OKUDA,TNM stage,alphafoetoprotein level,portal thrombosis,size of the largest nodule,tumor differentiation,microvascular invasion,underlying cirrhosis and liver ***:Overall and recurrence free survivals were80.7%and 67.4%at 3 years,and 70.6%and 67.4%at 5 years,*** to a multivariate Cox model,only FDG PET/CT RSUVmax predicted recurrence free *** though the MILAN criteria alone were not predictive,it is worth noting that none of the patients outside the MILAN criteria and with RSUVmax<1.15 ***:FDG PET/CT with an RSUVmax cutoff value of 1.15 is a strong prognostic factor for recurrence and death in patients with HCC treated by LT in this retrospective *** prospectivestudies should test whether this metabolic index should be systematically included in the preoperative assessment.

关键词： Cancer Hepatoma Hepatocellular cancer Liver transp

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快速RSA—硬件:梦想还是现实?

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信息安全与通信保密 1990年第1期12卷 74-78页

作者： Frank Hoornaert Marc Decroos Joos Vandewalle Rene govaerts 王晓鸣

本文描述了RSA算法的硬件实现,是用120比特的位片处理器来实现的,这些处理器无需其它电路就可连在一起,以获得任意字长。对512比特的操作数,取幂运算少于30微秒。

关键词：取幂 RSA 密码学乘法运算预先计算电子签名接口卡通信结构数据通路进位加法

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