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Quantification of acetone emission from pine plants

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Science China Chemistry 2002年第5期45卷 532-540页

作者：邵敏 jürgen Wildt State joint Key Laboratory of Environmental Simulation and Pollution Control Center for Environmental Sciences Peking University Beijing 100871 China

Acetone emission from pine plants (pinus sylvestris) is measured by continuously stirred tank reactor. Under a constant light intensity, acetone emission rates increase exponentially with leaf temperature. When leaf temperature is kept constant, acetone emission increases with light intensity. And acetone emission in darkness is also detected. Acetone emitted from pine is quickly labeled by 13C when the plants are exposed to air with 630 mg/m3 13CO2. However, no more than 20% of acetone is 13C labeled. Acetone emission from pine may be due to both leaf temperature- controlled process and light intensity-controlled process. Based on these understandings, an algorithm is used to describe the short term acetone emission rates from pine.

关键词： biogenic emission, carbonyl compound, 13C labeling, simulation.

Gene therapy for spinal muscular atrophy:perspectives on the possibility of optimizing SMN1 delivery to correct all neurological and systemic perturbations

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Neural Regeneration Research 2025年第7期20卷 2011-2012页

作者： Sharon j.Brown Rafael j.Yáñez-Muñoz Heidi R.Fuller school of Pharmacy and Bioengineering Keele UniversityKeeleUK Wolfson Center for Inherited Neuromuscular Disease TORCH BuildingRJAH Orthopaedic HospitalOswestryUK *** Center of Gene and Cell TherapyDepartment of Biological SciencesSchool of Life Sciences and the EnvironmentRoyal Holloway University of LondonEghamUK

Spinal muscular atrophy(SMA)is a genetic condition that results in selective lower motor neuron loss with concomitant muscle weakness and *** genetic cause of SMA was understood in 1995 when loss or impairment of the survival motor neuron 1(SMN1)gene was identified as the main contributing factor(Lefebvre et al.,1995).This,in combination with the discovery that humans have a“back-up”gene,SMN2,which can produce low levels(approximately 10%)of the full-length functional SMN protein,has led to the generation of SMA-specific gene *** was traditionally classified according to age of symptom onset and developmental milestones achieved,with life expectancy and severity varying between ***,SMN2 copy number is used as a proxy for the prediction of disease severity,with higher SMN2 copy number typically being associated with reduced severity of SMA,although this relationship is not absolute:some individuals with low SMN2 copy number have less severe SMA phenotypes and vice ***,the etiology of SMA is further complicated by other factors,such as non-typical nucleotide variants and SMN2-independent modifiers of disease severity.

关键词： atrophy traditionally absolute

A Hybrid Algorithm of Event-Driven and Time-Driven Methods for Simulations of Granular Flows

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Communications in Computational Physics 2011年第9期10卷 1027-1043页

作者： jun Huang Ole jørgen Nydal Department of Energy and Process Engineering Norwegian University of Science and TechnologyTrondheimNorway

The classical discrete element approach(DEM)based on Newtonian dynamics can be divided into two major groups,event-driven methods(EDM)and timedriven methods(TDM).Generally speaking,TDM simulations are suited for cases with high volume fractions where there are collisions between multiple *** simulations are suited for cases with low volume fractions from the viewpoint of CPU time.A method combining EDM and TDM called Hybrid Algorithm of event-driven and time-driven methods(HAET)is presented in this *** HAET method employs TDM for the areas with high volume fractions and EDM for the remaining areas with low volume *** can decrease the CPU time for simulating granular flows with strongly non-uniform volume *** addition,a modified EDM algorithm using a constant time as the lower time step limit is ***,an example is presented to demonstrate the hybrid algorithm.

关键词： Time-driven method(TDM) event-driven method(EDM) Hybrid algorithm of eventdriven and time-driven methods(HAET) granular flow

Asymmetric cytokinin signaling opposes gravitropism in roots^∞

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journal of Integrative Plant Biology 2020年第7期62卷 882-886页

作者： Sascha Waidmann jürgen Kleine-Vehn Department of Applied Genetics and Cell Biology University of Natural Resources and Life Sciences(BOKU)Muthgasse 18Vienna1190Austria

In contrast to primary roots,lateral roots partially repress gravitropic growth and establish a distinct gravitropic set point angle(GSA;Digby and Firn 1995).The distinct GSAs of primary and lateral roots ultimately allow the root system to radially explore its surroundings(Mullen and Hangarter 2003).Lateral roots emerge in a 90°angle from the primary root(so-called stage I;Figure 1).

关键词： roots Figure

Diffractive-optical processing of temporal signals, part Ⅱ: optical tapped-delay line

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Chinese Optics Letters 2006年第5期4卷 262-264页

作者： jürgen jahns Adolf W.Lohmann LG Optical Information Technology University of HagenGermany Lst.Multimedia and Signal Processing University of Erlangen-NürnbergGermany

The topic of this presentation is the utilization of time for optical information processing. As clock rates in computing and communication systems increase and reach the THz border, optical techniques for signal filtering, shaping and clock distribution become attractive. We discuss the use of optics in temporal processing and consider in particular diffractive solutions, in this paper, we describe the use of double diffraction for implementing an ultrafast tapped-delay line.

关键词： optical tapped-delay line Diffractive-optical processing of temporal signals part

Early cisternal fibrinolysis is more effective than rescue spasmolysis for the prevention of delayed infarction after subarachnoid haemorrhage

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Stroke & Vascular Neurology 2022年第2期7卷 108-113页

作者： Roland Roelz Christian scheiwe jürgen Grauvogel Istvan Csok Volker Arnd Coenen jürgen Beck Peter C Reinacher Department of Neurosurgery Medical Center-University of FreiburgFreiburgGermany Department of Stereotactic and Functional Neurosurgery Medical Center-University of FreiburgFaculty of MedicineFreiburgGermany Fraunhofer Institute for Laser Technology(ILT) AachenGermany

Background To compare the efficacy of two different concepts of cisternal therapy—PREVENTIVE fibrinolysis plus on-demand spasmolysis versus RESCUE spasmolysis—for the prevention of cerebral vasospasm(CVS)and delayed cerebral infarction(DCI)in patients with aneurysmal subarachnoid haemorrhage(aSAH).Methods Retrospective analysis of 84 aSAH patients selected for cisternal therapy for DCI prevention.66 high-risk patients received PREVENTIVE cisternal therapy to enhance blood *** stereotactic catheter ventriculocisternostomy(STX-VCS)or intraoperative placement of a cisterno-ventriculostomy catheter(CVC),followed by fibrinolytic cisternal lavage using urokinase was *** case of vasospasm,nimodipine was applied intrathecally.22 low-risk patients who developed CVS against expectations were selected for STX-VCS as RESCUE intervention for cisternal spasmolysis with *** of DCI and mean flow velocities of daily transcranial Doppler(TCD)ultrasonographies were *** Despite a higher prespecified DCI risk,patients selected for PREVENTIVE intervention primarily aiming at blood clearance had a lower DCI rate compared with patients selected for intrathecal spasmolysis as a RESCUE therapy(11.3%vs 18.2%).After intrathecal treatment onset,CVS(TCD>160 cm/s)occurred in 45%of patients with PREVENTIVE and 77%of patients with RESCUE therapy(p=0.013).A stronger response of CVS to intrathecal nimodipine was observed in patients with PREVENTIVE intervention as the mean CVS duration after start of intrathecal nimodipine was 3.2 days compared with 5.8 days in patients with RESCUE therapy(p=0.026).Conclusions PREVENTIVE cisternal therapy directed at blood clearance is more effective for the prevention of CVS and delayed infarction compared with cisternal RESCUE spasmolysis.

关键词： prevention spasmolysis infarction

Nobel Prize for Our Advisor, Gerhard Ertl, Germany

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Chinese journal of Catalysis 2007年第11期 925-926页

作者： jrgen Caro Member of the Advisory Board of the Chinese journal of Catalysis Member of the International Advisory Committee of the State Key Laboratory of Catalysis of the Chinese Academy of Sciences University of Hannover Germany

The 2007 Nobel Prize for chemistry has been awarded on December 10th to the German scientist Gerhard Ertl for "his thorough studies of fundamental molecular processes at the

关键词： Gerhard Ertl Germany Nobel Prize for Our Advisor

Diffractive-optical processing of temporal signals, part I: basic principles

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Chinese Optics Letters 2006年第5期4卷 259-261页

作者： jürgen jahns Adolf W.Lohmann LG Optical Information Technology University of HagenGermany Lst.Multimedia and Signal Processing University of Erlangen-NürnbergGermany

The topic of this paper is the utilization of time for optical information processing. As clock rates in computing and communication systems increase and reach the THz border, optical techniques for signal filtering, shaping and clock distribution become attractive. We discuss the use of optics in temporal processing and consider in particular diffractive solutions. In part one of this paper, we discuss the basic concepts of temporal optics.

关键词： time part I Diffractive-optical processing of temporal signals basic principles

GAS TRANSPORT PROPERTIES OF A POLYIMIDE BASED ON 2, 2-BIS (3, 4-DECARBOXYPHENYL) HEXAFLUOROPROPANE AND meta-PHENYLENEDIAMINE

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Chinese journal of Polymer Science 1998年第1期16卷 86-90页

作者：徐志康徐又一 Springer jürgen Department of Polymer Science & Engineering Zhejiang University Hangzhou 310027 China Institute of Technical Chemistry Technical University of Berlin Berlin 10623 Germany

By means of a vacuum time-lag method, gas transport properties of a polyimide based on 2,2-bis(3,4-decarboxyphenyl) hexafluoropropane dianhydride (6FDA) and meta-phenylenediamine (mPDA) have been measured as a function of upstream pressure and temperature. The results show that no gas-induced plasticization occurs for this polyimide in the upstream pressure range from 1 atm to 20 atm. The temperature dependence of P and D can be described by the Arrhenius equations. The activation energies of permeation and diffusion were obtained for the gas/polymer pair studied and correlated with the size of penetrant gas.

关键词： polyimide membrane gas permeation gas separation