Search results for "väri"
showing 10 items of 164 documents
Red Light Optogenetics in Neuroscience
2022
Optogenetics, a field concentrating on controlling cellular functions by means of light-activated proteins, has shown tremendous potential in neuroscience. It possesses superior spatiotemporal resolution compared to the surgical, electrical, and pharmacological methods traditionally used in studying brain function. A multitude of optogenetic tools for neuroscience have been created that, for example, enable the control of action potential generation via light-activated ion channels. Other optogenetic proteins have been used in the brain, for example, to control long-term potentiation or to ablate specific subtypes of neurons. In in vivo applications, however, the majority of optogenetic too…
Predictive First-principles Modeling of a Photosynthetic Antenna Protein : The Fenna-Matthews-Olson Complex
2020
High efficiency of light harvesting in photosynthetic pigment-protein complexes is governed by evolutionary-perfected protein-assisted tuning of individual pigment properties and inter-pigment interactions. Due to the large number of spectrally overlapping pigments in a typical photosynthetic complex, experimental methods often fail to unambiguously identify individual chromophore properties. Here we report a first principles-based modeling protocol capable of predicting properties of pigments in protein environment to a high precision. The technique was applied to successfully uncover electronic properties of the Fenna-Matthews-Olson (FMO) pigment-protein complex. Each of the three subunit…
Acoustic, neural, and perceptual correlates of polyphonic timbre
2012
Thinhorn sheep evolution and behaviour
2006
Miksi kaikki ohutsarvilampaat Kanadan Yukonjoen itäpuolella ovat tummia, mutta joen toisella puolella valkoisia? Minkä vuoksi tummissa populaatioissa lampaiden väri vaihtelee niin paljon? Näitä kysymyksiä John Loehr valotti väitöskirjassaan.Ohutsarvilammas on pohjoisamerikkalainen villilammaslaji, joka elää Alaskan ja Pohjois-Kanadan vuoristoissa. Laji on mielenkiintoinen värivaihtelunsa takia. Suurin osa populaatioista on täysin valkoisia, mutta kolmesta vuoristosta löytyy harmaita ja mustia lampaita. Näissä vuoristoissa lammasyksilöiden tummuusaste vaihtelee niin paljon, että Loehr pystyi tunnistamaan yksilöitä värikuvioiden avulla. Loehr tutki myös ihmisten mahdollista vaikutusta ohutsar…
Stronger C -odd color charge correlations in the proton at higher energy
2023
The non-forward eikonal scattering matrix for dipole-proton scattering at high energy obtains an imaginary part due to a $C$-odd three gluon exchange. We present numerical estimates for the perturbative Odderon amplitude as a function of dipole size, impact parameter, their relative azimuthal angle, and light-cone momentum cutoff $x$. The proton is approximated as $\psi_\mathrm{qqq}|qqq\rangle + \psi_\mathrm{qqqg}|qqqg\rangle$, where $\psi_\mathrm{qqq}$ is a non-perturbative three quark model wave function while the gluon emission is computed in light-cone perturbation theory. We find that the Odderon amplitude increases as $x$ decreases from 0.1 to 0.01. At yet lower $x$, the reversal of t…
Eikonal minijet model for proton-proton collisions
2017
Tässä tutkielmassa johdettiin minijettimalli suurienergiaisille protoni-protoni -törmäyksille eikonaaliformalismissa. Mallia testattiin numeerisen laskennan keinoin kokeellisilla tuloksilla protoni-protoni -törmäyksien elastisista, epäelastisista ja kokonaisvaikutusaloista keskeisliikemääräkoordinaatiston energiaskaalassa sqrt(s)=0.1..100 TeV. Myös viimeisimpiä CERN-LHC -kiihdyttimen mittaustuloksia tarkasteltiin. Numeerisen analyysin yhtenä osana tutkittiin myös yhden efektiivisen aliprosessin approksimaatiota, joka osoittautui tutkituilla energioilla hyvin tarkaksi. Lisäksi tarkasteltiin moninkertaisen kaksijettituoton roolia protoni-protoni -törmäysten epäelastisessa vaikutusalassa. An e…
Minijet initial state of heavy-ion collisions from next-to-leading order perturbative QCD
2014
Gut microbiome and atrial fibrillation - results from a large population-based study
2023
Background Atrial fibrillation (AF) is an important heart rhythm disorder in aging populations. The gut microbiome composition has been previously related to cardiovascular disease risk factors. Whether the gut microbial profile is also associated with the risk of AF remains unknown. Methods We examined the associations of prevalent and incident AF with gut microbiota in the FINRISK 2002 study, a random population sample of 6763 individuals. We replicated our findings in an independent case–control cohort of 138 individuals in Hamburg, Germany. Findings Multivariable-adjusted regression models revealed that prevalent AF (N = 116) was associated with nine microbial genera. Incident AF (N = 5…
Timbral Qualities of Semantic Structures of Music.
2010
The rapid expansion of social media in music has provided the field with impressive datasets that offer insights into the semantic structures underlying everyday uses and classification of music. We hypothesize that the organization of these structures are rather directly linked with the ”qualia” of the music as sound. To explore the ways in which these structures are connected with the qualities of sounds, a semantic space was extracted from a large collection of musical tags with latent semantic and cluster analysis. The perceptual and musical properties of 19 clusters were investigated by a similarity rating task that used spliced musical excerpts representing each cluster. The resulting…