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A good design of a Boolean function used in a stream cipher requires that the function satisfies certain criteria in order to resist different attacks. In this paper we study the tradeoff between two such criteria, the nonlinearity and the resiliency. The results are twofold. Firstly, we establish the maximum nonlinearity for a fixed resiliency in certain cases. Secondly, we present a simple searc
Closely related sympatric species are expected to evolve strong species discrimination because of the reinforcement of mate preferences [1-4]. Fitness costs of heterospecific matings are thought to be higher in females than in males, and females are therefore expected to show stronger species discrimination than males [5, 6]. Here, we investigated gender and species differences in sexual isolation
Popular Abstract in Swedish Enzymet magnesium-kelatas katalyserar bildandet av magnesuim-protoporfyrin genom insättning av en magnesiumjon i protoporfyrin. Detta är det första unika steget i tillverkningen av klorofyll hos växter, alger och fotosyntetiska bakterier. Magnesium-kelatas är uppbyggt av tre olika proteiner som kallas I (vikt 40 kDa), D (70 kDa) och H (140 kDa). Tillsammans bildar dessaThe insertion of Mg2+ into protoporphyrin IX represents the first committed step in the chlorophyll and bacteriochlorophyll biosynthetic pathways. The reaction is catalyzed by the multisubunit enzyme Mg-chelatase, which consists of three subunits, known as I (molecular weight ~40 kDa), D (~70 kDa), and H (~140 kDa). To fully understand this first step in chlorophyll biosynthesis each protein compo
In this paper a systematic study of the surface influence on the elastic properties of nanosized iron and tungsten wires and films is performed. Single crystal defect-free nanowires and nanofilms are examined through molecular statics simulations, and the concepts of surface energy and third order elastic constants are used in an attempt to describe the elastic properties. For structures where the re
Popular Abstract in Swedish Vårärt (Lathyrus vernus) är en skogsväxt som tillhör familjen ärtväxter (Fabaceae). Den förekommer hos oss i södra och mellersta Sverige och har sin nordligaste utbredning vid Höga kusten, där den förekommer i geografiskt isolerade populationer på sydsluttningar med gynnsamt klimat. I övrigt har vårärten sitt utbredningscentrum i centrala och östra Europa. Med denna avhIn the present thesis, I investigated patterns of genetic variation in the forest herb Lathyrus vernus (Fabaceae), using plant material from different-sized populations representing three geographically separated regions: central Europe, southern and central Sweden. My studies included presumably neutral or weakly selected characters (allozymes and leaflet shape) as well as characters that should
The paper aims to explore to what degree different types of terms in engineering information (Ei) thesaurus and classification scheme influence automated subject classification performance. Preferred terms, their synonyms, broader, narrower, related terms, and captions are examined in combination with a stemmer and a stop-word list. The algorithm comprises string-to-string matching between words i
History plays an important role in the philosophy of human rights, more so than in philosophical discussions on related concepts, such as justice. History tends to be used in order to make it credible that there is a tradition of rights as a moral idea, or an ethical ideal, that transcends national boundaries. In the example that I investigate in this chapter, this moral idea is tightly spun aroun
Popular Abstract in Swedish Under de senaste årtiondena har vattenfärgen i många svenska sjöar och vattendrag ökat. Detta innebär att vattnet blir brunare, och detta fenomen benämns därför brunifiering. Brunifiering är inget unikt för Sverige, utan förekommer på åtskilliga ställen på norra halvklotet. Brunifieringen påverkar det akvatiska ekosystemet och vattnets potentiella samhällsnytta. Ur en eThe term brownification refers to the trend of increasing water color, i.e. the water becoming browner, which has been observed throughout the northern hemisphere over the last decades. Brownification has both ecological and societal implications. From an ecological point of view the impaired light climate may e.g. reduce aquatic primary production and affect predator-prey interactions within the
In hybrid zones genetically differentiated populations meet and interbreed. As they result from ongoing divergence and potential speciation, such zones provide opportunities to study how different factors affect this process. The hybrid zone between the all black carrion crow (Corvus corone corone) and the grey and black hooded crow (Corvus c. cornix) stretches c. 2400 km throughout Europe. I have
Popular Abstract in Swedish Det här är en studie av Wallace Stevens poetik och poesi med inriktning på 1930-talet, då hans poesi påverkades av en kraftig kulturell press på socialt engagemang och politisk användbarhet. Argumentet framställer hur olika men samverkande element i hans poetiska språk, som diktion, prosodi och metafor, under den här perioden utnyttjas för att skapa ett intryck av estetThis dissertation studies Wallace Stevens? ideas and practice of poetic language with a focus on the 1930s, an era in which Stevens persistently thematized a keenly felt pressure for the possible social involvement and political utility of poetic language. The argument suggests how mutually implicated elements of his poetry such as diction, prosody and metaphor are relied on to signify or enact ae
In this book, three historical macro-regions are analysed: East Asia, Southeast Asia and Mesoamerica. By comparing three very different historiographical patterns from the specific point of view of social militarisation, we gain an outsider's perspective that proves to be very illuminating. Due to structural features of the various scholarly arenas the three regions turn out very differently. Some
