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263篇 您的检索式:作者名="Witzel"
    题名 作者 年代 出处 被引量
1北方针叶林的氮沉降和生物多样性以及氮的临界负荷显示文摘可将临界负荷概念用于确定生态系统能够忍耐的无显著毒害作用的沉积水平。本文总结了瑞典研究课题'跨界大气污染的削减策略(ASTA)'中北方针叶林氮的临界负荷评估工作。不论是瑞典北方低水平氮背景沉降地区的野外实验,还是大尺度的监测研究,结果都表明:少量增加氮剂量会引发重大的植被变化;并且停止氮输入后,植被恢复非常缓慢。数据表明,即便氮输入的速率低于目前建议的临界负荷(北方针叶林下层植被的经验值为10~15kg N/hm^2·a),生态系统的关键成分也会发生变化。根据这些数据,我们认为临界负荷应降为6 kg N/hm^2·a。Annika Nordin Joachim Strengbom Johanna Witzell Torgny Nsholm Lars Ericson 王胜 2005AMBIO-人类环境杂志2005,34,1:9
2A self-made, low-cost infrared system for evaluating the sciatic functional index in mice显示文摘The sciatic functional index(SFI) is a popular parameter for peripheral nerve evaluation that relies on footprints obtained with ink and paper. Drawbacks include smearing artefacts and a lack of dynamic information during measurement. Modern applications use digitized systems that can deliver results with less analytical effort and fewer mice. However, the systems are expensive(€40,000). This study aimed to evaluate the applicability and precision of a self-made, low-cost infrared system for evaluating SFI in mice. Mice were subjected to unilateral sciatic nerve crush injury(crush group; n = 7) and sham operation(sham group; n = 4). They were evaluated on the day before surgery, the 2^(nd), 4^(th) and 6^(th) days after injury, and then every day up to the 23^(rd) day after injury. We compared two SFI evaluation methods, i.e., conventional inkand-paper SFI(C-SFI) and our infrared system(I-SFI). Our apparatus visualized footprints with totally internally reflected infrared light(950 nm) and a camera that can only detect this wavelength. Additionally we performed an analysis with the ladder beam walking test(LBWT) as a reference test. I-SFI assessment reduced the standard deviation by about 33 percent, from 11.6 to 7.8, and cut the variance around the baseline to 21 percent. The system thus requires fewer measurement repetitions and fewer animals, and cuts the cost of keeping the animals. The apparatus cost €321 to build. Our results show that the process of obtaining the SFI can be made more precise via digitization with a self-made, low-cost infrared system.Lukas Fricker Vincenzo Penna Florian Lampert G.Bjoern Stark Christian Witzel Georgios Koulaxouzidis 2016Neural Regeneration Research2016,11,5:4
3Fibrin glue repair leads to enhanced axonal elongation during early peripheral nerve regeneration in an in vivo mouse model显示文摘Microsurgical suturing is the gold standard of nerve coaptation. Although literature on the usefulness of fibrin glue as an alternative is becoming increasingly available, it remains contradictory. Furthermore, no data exist on how both repair methods might influence the morphological aspects(arborization; branching) of early peripheral nerve regeneration. We used the sciatic nerve transplantation model in thy-1 yellow fluorescent protein mice(YFP; n = 10). Pieces of nerve(1cm) were grafted from YFP-negative mice(n = 10) into those expressing YFP. We performed microsuture coaptations on one side and used fibrin glue for repair on the contralateral side. Seven days after grafting, the regeneration distance, the percentage of regenerating and arborizing axons, the number of branches per axon, the coaptation failure rate, the gap size at the repair site and the time needed for surgical repair were all investigated. Fibrin glue repair resulted in regenerating axons travelling further into the distal nerve. It also increased the percentage of arborizing axons. No coaptation failure was detected. Gap sizes were comparable in both groups. Fibrin glue significantly reduced surgical repair time. The increase in regeneration distance, even after the short period of time, is in line with the results of others that showed faster axonal regeneration after fibrin glue repair. The increase in arborizing axons could be another explanation for better functional and electrophysiological results after fibrin glue repair. Fibrin glue nerve coaptation seems to be a promising alternative to microsuture repair.Georgios Koulaxouzidis Gernot Reim Christian Witzel 2015Neural Regeneration Research2015,10,7:2
4Controlling and regulation of integrated aquaponic production systems – An approach for a management execution system (MES)显示文摘Manufacturing execution systems(MESs)play a significant role in the manufacturing paradigm.MES is there to link between the Enterprise Resource Planning(ERP)systems and the plant equipment control or Supervisory Control and Data Acquisition(SCADA)applications.In this paper the MES of the INAPRO aquaponics system which was developed to support and advise the aquaponics managers in operating the complex aquaponic farms,will be presented.One important feature of the INAPRO aquaponics system is to minimize fresh water<3%,energy and nutrient supplies.This can only be achieved by appropriate design of the fish and crop mixture,considering the fish to crop ratio,when to sow the crops etc.and to monitor the system to see whether it performing as designed or not.Therefore,the MES has a view to show the designed system with all the material flow(water,energy and nutrients)balances and also how the system will be performing for a given predictive horizon.Knowing the future developments of the system,the operator can taking corrective measures to make sure that the system is behaving as required.An example of water balance of a system with 40 m3 fish tanks coupled with a hydroponic NFT system with 1,000 m2 which can produce five tons of Tilapia and 75 tons of tomato yearly is given.Olaf Witzel Stefan Wilm Divas Karimanzira Daniela Baganz 2019Information Processing in Agriculture2019,6,3:2
5Impact of initial phage/host ratio and nutrient addition on coexistence in a phage-host system显示文摘Wolf A Zheng Tim-ling Witzel K P 2004Aquatic Microbial Ecology2004,35,:1
6The effect of ultrasound dissection in thyroid surgery显示文摘Witzel K von Rahden BH Stein HJ 2009Eur Surg Res2009,43,2:1
7Involvement of alpha 1-2- fucosyltransferase I ( FUT1 ) and surface-expressed Lewis ( y ) (CD174) in first endothelial cell-cell contacts during angiogenesis 显示文摘Moehler TM Sauer S Witzel M 2008J Cell Physiol2008,215,1:1
8The ammonia monoo- xygenase structural gene amoA as a functional marker: Molecular fine - scale analysis of natural ammonia - oxidizing populations 显示文摘Rotthauwe J H Witzel K P Liesack W 1997Applied and Environmental Microbiology1997,63,:1
9Applications for nitric oxide in halting proliferation of tumor cells 显示文摘Reynolds MM Witzeling SD Damodaran VB 2013Biochem Biophys Res Commun2013,431,4:1
10Observation of attosecond light localization in higher order harmonic generation显示文摘Papadogiannis N A Witzel B Kalpouzos C 1999Phys Rev Lett1999,83,21:1
11The ammonia monooxygenase structural gene amo A as a functional marker:Molecular finescale analysis of natural ammonia-oxidizing populations显示文摘Rotthauwe J-H Witzel K-P Liesack W 1997Apply Environment Microbiology1997,66,12:1
12The ammonia monooxygenase structural gene AMOA as a functional marker:molecular fine-scale analysis of natural ammonia-oxidizing populations显示文摘ROTTHAUWE J H WITZEL K P LIESACK W 1997APPL Environ Microbiol1997,63,12:1
13The QuantumCor device for treating mi- tral regurgitation : an animal study 显示文摘Goel R Witzel T Dickens D 2009Catheter Cardiovasc Interv2009,74,:1
14Transoral access for endoscopic thyroid resection显示文摘Witzel K von Rahden BH Kaminski C 2008Surg Endosc2008,22,8:1
15Optical Path Length Calibration: A Standard Approach for Use in Absorption Cell-Based IR-Spectrometric Gas Analysis显示文摘Javis Anyangwe Nwaboh Oliver Witzel Andrea Pogány Olav Werhahn Volker Ebert Rolf W. Berg 2014International Journal of Spectroscopy2014,,:1
16Pathway sampling by regenerating peripheral axons显示文摘Witzel C Rohde C Brushart TM 2005Comp Neuro2005,485,3:1
17Increase of interstitial collagen in the mouse endo- metrium during decidualization 显示文摘TEODORO W R WITZEL S S VELOSA A P 2003Connect Tissue Res2003,44,2:1
18Regulation of cyc|in D1 gene expres- sion显示文摘Witzel II Koh LF Perkins ND 2010Biochem Soc Trans2010,38,1:1
19Regulation of cyclin D1 gene expression显示文摘Witzel I I Koh L F Perkins N D 2010Biochem Soc Trans2010,38,1:1
20ETA and ETB receptor function in pancreatitis-associated microcirculatory failure, inflammation, and parenchymal injury显示文摘Plusczyk T Witzel B Menger MD 2003Am J Physiol Gastrointest Liver Physiol2003,285,1:1
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