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A characterization of finite simple groups by the orders of solvable subgroups

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Science China Mathematics 2007年第5期50卷 715-726页

作者： klaus DENECKE Institut für Mathematik Universitt PotsdamGermany

Let G be a finite group and S be a finite simple group. In this paper, we prove that if G and S have the same sets of all orders of solvable subgroups, then G is isomorphic to S, or G and S are isomorphic to Bn(q), Cn... 详细信息

关键词： finite simple groups solvable subgroup order characterization 20D08 20D05

Groundwater protection:What can we learn from Germany?

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第3期9卷 227-231页

作者： klaus-Dieter BALKE Institute for Geosciences University of TübingenSigwartstr.10D-72076 TübingenGermany

For drinking water security the German waterworks proceed on a comprehensive concept,i.e.,the protection of all the regions from the recharge area to the *** includes the protection of the recharge area by a precautionary management,a safe water treatment,a strict maintenance of the water distribution network,continuous control and an intensive training of *** protection zones together with effective regulations and control play a very important *** protection zones with different restrictions in land-use are *** in reservoirs and lakes is also protected by Surface Water Protection *** the surrounding area the land-use is controlled,*** treatment is necessary if acidification happens caused by acid rain,or eutrophication caused by the inflow of *** important is the collaboration between waterworks and the farmers cultivating land in the recharge area in order to execute water-protecting ecological farming with the aim to reduce the application of fertilizers and plant protection *** financial losses have to be compensated by the waterworks.

关键词： Drinking water security Germany Groundwater protection zone Water protection

The Order of Hypersubstitutions of Type(2,2)

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Acta Mathematica Sinica,English Series 2007年第4期23卷 659-670页

作者： Thawhat CHANGPHAS klaus DENECKE Universit tPotsdam Institut für Mathematik D-14415 PotsdamPF 601553Germany

Hypersubstitutions are mappings which map operation symbols to terms of the corresponding arities. They were introduced as a way of making precise the concept of a hyperidentity and generalizations to M-hyperidentities. A variety in which every identity is satisfied as a hyperidentity is called solid. If every identity is an M-hyperidentity for a subset M of the set of all hypersubstitutions, the variety is called M-solid. There is a Galois connection between monoids of hypersubstitutions and sublattices of the lattice of all varieties of algebras of a given type. Therefore, it is interesting and useful to know how semigroup or monoid properties of monoids of hypersubstitutions transfer under this Galois connection to properties of the corresponding lattices of M-solid varieties. In this paper, we study the order of each hypersubstitution of type （2, 2）, i.e., the order of the cyclic subsemigroup generated by that hypersubstitution of the monoid of all hypersubstitutions of type （2, 2）. The main result is that the order is 1, 2, 3, 4 or infinite.

关键词： Hypersubstitutions M-solid varieties order semigroups

1O2-Mediated and EXECUTER-Dependent Retrograde Plastid-to-Nucleus Signaling in Norflurazon-Treated Seedlings of Arabidopsis thaliana

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Molecular Plant 2013年第5期6卷 1580-1591页

作者： Chanhong Kim klaus Apel Boyce Thompson Institute for Plant Research Ithaca NY 14853-1801 USA

Chloroplast development depends on the synthesis and import of a large number of nuclear-encoded pro- teins. The synthesis of some of these proteins is affected by the functional state of the plastid via a process known as retrograde signaling. Retrograde plastid-to-nucleus signaling has been often characterized in seedlings of Arabidopsis thaliana exposed to norflurazon （NF）, an inhibitor of carotenoid biosynthesis. Results of this work suggested that, throughout seedling development, a factor is released from the plastid to the cytoplasm that indicates a perturbation of plastid homeostasis and represses nuclear genes required for normal chloroplast development. The identity of this factor is still under debate. Reactive oxygen species （ROS） were among the candidates discussed as possible retrograde signals in NF-treated plants. In the present work, this proposed role of ROS has been analyzed. In seedlings grown from the very beginning in the presence of NF, ROS-dependent signaling was not detectable, whereas, in seedlings first exposed to NF after light-dependent chloroplast formation had been completed, enhanced ROS production occurred and, among oth- ers, 1O2-mediated and EXECUTER-dependent retrograde signaling was induced. Hence, depending on the developmental stage at which plants are exposed to NF, different retrograde signaling pathways may be activated, some of which are also active in non-treated plants under light stress.

关键词： retrograde signaling singlet oxygen Executer norflurazon programmed cell death photo-oxidative stress.

Generalized Integral Representations for Functions with Values in C(V_(3,3))

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Chinese Annals of Mathematics,Series B 2011年第1期32卷 123-138页

作者： klaus GURLEBECK Zhongxiang ZHANG Institut f. Mathematik/Physik Bauhaus-UniversitAt Weimar Coudraystr. 13 D-99423 Weimar Germany Corresponding author. School of Mathematics and Statistics Wuhan University Wuhan 430072 China

By using the solution to the Helmholtz equation u-λu = 0(λ≥ 0),the explicit forms of the so-called kernel functions and the higher order kernel functions are *** by the generalized Stokes formula,the integral representation formulas related with the Helmholtz operator for functions with values in C(V3,3) are *** application of the integral representations,the maximum modulus theorem for function u which satisfies Hu = 0 is given.

关键词： Universal Clifford algebra Helmholtz equation Generalized CauchyPompeiu formula

VARIATIONAL DISCRETIZATION OF PARABOLIC CONTROL PROBLEMS IN THE PRESENCE OF POINTWISE STATE CONSTRAINTS

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Journal of Computational Mathematics 2011年第1期29卷 1-15页

作者： klaus Deckelnick Michael Hinze Institut fiir Analysis und Numerik Otto-von Guericke-Universitiit Magdeburg Universitiitsplatz 2 39106 Magdeburg Germany Schwerpunkt Optimierung und Approximation Universitiit Hamburg Bundesstraape 55 20146 Hamburg Germany

space dimensions. These bounds follow from uniform estimates for the discretization error of the state under natural regularity requirements.

关键词： Parabolic optimal control problem State constraints Error estimates.

Referential alarm calling behaviour in New World primates

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Current Zoology 2012年第5期58卷 680-697页

作者： Cristiane CASAR klaus ZUBERBOHLER Scottish Primate Research Group School of Psychology University of St Andrews. St Mary's Quad St Andrews Fife Scotland UK KY16 9JP Conservation Ecology and Animal Behaviour Group Department of Post-Graduate Studies in Zoology Pr6dio 41 Pontificia Universidade Cat61ica de Minas Gerais Av. Dom Jos6 Gaspar 500 Cora~o Eucarfstico 30535-610 Belo Horizonte Minas Gerais Brazil Cognitive Science Centre Rue Emile Argand 11 University of Neuch~tel Neuch~tel Switzerland

There is relatively good evidence that non-human primates can communicate about objects and events in their envi- ronment in ways that allow recipients to draw inferences about the nature of the event experienced by the signaller. In some spe- cies, there is also evidence that the basic semantic units are not individual calls, but call sequences and the combinations gener- ated by them. These two findings are relevant to theories pertaining to the origins of human language because of the resemblances of these phenomena with linguistic reference and syntactic organisation. Until recently, however, most research efforts on the primate origins of human language have involved Old World species with comparatively few systematic studies on New World monkeys, which has prevented insights into the deeper phylogenetic roots and evolutionary origins of language-relevant capaci- ties. To address this, we review the older primate literature and very recent evidence for functionally referential communication and call combinations in New World primates. Within the existing literature there is ample evidence in both Callitrichids and Ce- bids for acoustically distinct call variants given to external disturbances that are accompanied by distinct behavioural responses. A general pattern is that one call type is typically produced in response to a wide range of general disturbances, often on the ground but also including inter-group encounters, while another call type is produced in response to a much narrower range of aerial threats. This pattern is already described for Old World monkeys and Prosimians, suggesting an early evolutionary origin. Second, recent work with black-fronted tiff monkeys has produced evidence for different alarm call sequences consisting of acoustically distinct call types. These sequences appear to encode several aspects of the predation event simultaneously, notably predator type and location. Since meaningful call sequences have already been described in

关键词： Primate alarm calls Functionally referential calls Call combinations New World monkeys Old World monkeys

Stabilizing forest productivity and resilience at multiple scales

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森林生态系统:英文版 2023年第5期10卷 561-568页

作者： klaus v.Gadow Faculty of Forestry and Forest Ecology Georg-August-University GöttingenBüsgenweg 5D-37077GöttingenGermany Department of Forestry and Wood Science Faculty of AgriSciencesStellenbosch UniversityMatielandSouth Africa

The objective of this study is to introduce a coherent theoretical perspective for sustaining forested landscapes at different scales:meta(forest region),gamma(forest property)and alpha(forest stand),with some details on practical *** main part introduces an integrated set of approaches under three headings:a)gamma design,b)alpha jardinage,and c)continuous *** study is based on evidence gathered in the broadleaf and conifer mixed forests of north-eastern China,in European temperate forests,in various forest regions in India,in the afro-montane forests of Southern Africa,and in the pine-oak forests of the Mexican Sierra Madre Occidental.

关键词： forest heading pine

Tea in cardiovascular health and disease:a critical appraisal of the evidence

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Food Science and Human Wellness 2022年第3期11卷 445-454页

作者： klaus W.Lange Department of Experimental Psychology University of RegensburgRegensburg 93040Germany

The findings of various epidemiological studies,interventions using randomized controlled trials and mechanistic experiments have suggested a protective role of tea and its bioactive components in cardiovascular *** potential of tea in the prevention of cardiovascular diseases(CVDs)has therefore attracted increasing research ***,in particular flavonoids,found in both green and black tea,have been suggested to play a primary role in the reduction of CVD *** promising results regarding the effects of tea on blood pressure and other CVD-related biomarkers have been found in preclinical experiments,the effects demonstrated in human studies are modest and less *** discrepancy may be explained,at least in part,by different research strategies used in human and animal ***,since tea is globally one of the most commonly consumed beverages,even small beneficial effects in humans may shift the population distribution of CVD risk,with major implications for public ***,research conducted to date does not yield sufficiently robust evidence to allow a recommendation as to an optimal level of tea consumption as an element of health policies seeking to prevent hypertension and improve cardiovascular health.

关键词： Tea Cardiovascular diseases Health Prevention Treatment