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Video content constitutes a large share of residential Internet traffic. The major source of video content as of today is YouTube. In this paper, we analyse the user demand patterns for YouTube in two metropolitan access networks with more than 1 million requests over three consecutive weeks in the first network and more than 600,000 requests over four consecutive weeks in the second network. In p
Popular Abstract in Swedish Enzymer är en nödvändig del av allt liv på jorden. De katalyserar en stor mängd biologiska reaktioner, som utan enzymer skulle vara mycket långsamma. Det är väl belagt att fastän enzymer är stora och har en komplicerad struktur är det bara en liten del av varje enzymmolekyl som tar del i den kemiska reaktion som enzymet katalyserar. Denna del av enzymet kallas dess aktiA number of homo- and heterodinuclear complexes have been synthesized as structural and functional models for the the active sites of phosphoesterases and soluble methane monooxygenases. The complexes are based on four new dinucleating ligands containing a central, potentially bridging, phenolate moiety. The hydrolytic activity of the complexes was examined by exploring the ability of the complexe
The Great Trajanic Frieze is a Monument firmly entranched in the tradition of Graeco-Roman art.The study of the different components of its imagery, such as composition, iconography and antiquarian details, reveals how it transmits and transforms this tradition. The imagery reveals itself as conscentiously structured to present and repeat a limited set of concepts to the viewer. The book also pres
The aim of this research is to design a collaboratory that is a socio-technical platform to support sharing research data collection instruments in a social science discipline, in particular library and information science. A socio-technical approach to design that includes a literature review, an empirical study and use cases, are used to create specifications for a collaboratory prototype. Futur
Popular Abstract in Swedish Det finns tre muskeltyper i människokroppen; skelettmuskler, hjärtmuskler och glatta muskler. Skelettmusklerna är de muskler som gör att vi kan röra oss och andas (mellangärdesmuskeln är en skelettmuskel). Hjärtmuskelcellerna är de som gör att hjärtat slår. Den glatta muskulaturen finns på många ställen i kroppen (t.ex. i blodkärl, luftvägar och livmoder) och utför mångThis thesis examines the cellular and molecular mechanisms involved in the large diversity of the contractile properties in smooth muscle. Six studies, I-VI, are included. I: a slow smooth muscle (aorta) has a different nucleotide and phosphate dependence compared to a fast type (taenia coli). A slow ADP-release can be one mechanism responsible for the lower shortening velocity of aorta. II: treat
Highly sensitive biosensors were developed for environmental and medical applications. The biosensors were based on bioengineered proteins as biorecognition elements coupled to a highly sensitive capacitive transducer. Heavy metal binding proteins like the metallothionein SmtA, regulatory protein MerR, periplasmic protein MerP and the synthetic phytochelatin EC20 were used for designing, construc
We examined whether a high cortisol awakening response (CAR) and low cortisol decline over the day (CDD) are related to self-reported work stress and well-being, and whether there are gender differences in these relationships. Three hundred eighty-three working men and women responded to a survey measuring job stress factors, mastery at work, symptoms and well-being. Salivary cortisol was sampled
Popular Abstract in Swedish För att skydda sig mot infektioner har människan ett välutvecklat immunförsvar. I immunförsvaret ingår många olika celler och proteiner (äggviteämnen). Till exempel finns det celler som producerar antikroppar som specifikt känner igen bakterier och virus som en människa har utsatts för vid en tidigare infektion. Det finns också speciella celler som kan fagocytera (äta uMany microorganisms have developed mechanisms to protect themselves against attack from the complement system of the host. One possible mechanism for a microorganism to evade complement attack is to bind a human complement regulator, which may allow the microorganism to down-regulate complement activation. This thesis describes studies of such interactions between human C4b-binding protein (C4BP),
Radiative lifetimes have been studied in neutral copper, gold, magnesium, zinc, tellurium, sulphur, selenium, bismuth and helium and in singly ionised platinum and palladium. The radiative lifetimes were determined by time-resolved spectroscopy following single, two-photon or stepwise laser excitation. The excitations required short wavelengths, obtained by frequency mixing of radiation from pulse
The research presented in this thesis is focused on characterization of photophysical properties of lowest singlet excited states of carotenoids and their functions in the process of photosynthetic light harvesting. It is shown that the various light-harvesting complexes utilize different strategies to achieve efficient energy transfer from carotenoids to (bacterio)chlorophylls. Any study of energ
Popular Abstract in Swedish FISKETS EFFEKTER BEROR PÅ SAMSPELET MELLAN ARTER Fiske och jakt, så kallad populationsbeskattning, påverkar den fiskade eller jagade populationen på en rad olika sätt. Den direkta effekten är uppenbar: dödligheten ökar, och antalet individer i populationen minskar. I förlängningen påverkar denna minskning också andra arter, som t ex äter eller äts av individerna i den bHarvesting changes population abundance and can affect adaptation of several life-history traits. Harvesting can also have indirect effects ? effects on non-target species and secondary effects on target species ? because interactions between species in a community determine the relevant ecological and evolutionary feedback environment. Species interactions therefore influence the effect of harves
