Search results for "kuori"

A link between heritable parasite resistance and mate choice in dung beetles

2019

Parasites play a central role in the adaptiveness of sexual reproduction. Sexual selection theory suggests a role for parasite resistance in the context of mate choice, but the evidence is mixed. The parasite-mediated sexual selection (PMSS) hypothesis derives a number of predictions, among which that resistance to parasites is heritable, and that female choice favors parasite resistance genes in males. Here, we tested the PMSS hypothesis using the dung beetle Onthophagus taurus, a species that can be heavily parasitized by Macrocheles merdarius mites, which are known to affect adult survival. We investigated the heritability of resistance to M. merdarius, as well as whether female O. tauru…

Acoustic, neural, and perceptual correlates of polyphonic timbre

2012

Lehtimäen kirkon historia : kustavilaisen ristikirkon perustaminen, arkkitehtuuri ja taide-esineistö

2002

Range expansion to novel environments : evolutionary physiology and genetics in Leptinotarsa decemlineata

2010

Eco-physiological aspects of adaptation to seasonal environments : the latitudinal range expansion of the Colorado potato beetle across Europe

2013

Adaptation to stressful environments : invasion success of the Colorado potato beetle (Leptinotarsa decemlineata)

2018

Biological invasions, specifically human-induced dispersals, are one of the major threats to our biodiversity and are predicted to increase. Invasive pests provide an opportunity to study whether adaptation to human-induced environments could promote invasions to other human-induced environments. One major anthropogenic selection pressure is created by pesticides, and pests can be exposed to various pesticides in their native, as well as introduced, ranges. I investigated whether exposure to anthropogenic selection (i.e. insecticides and herbicides) and exposure to multiple anthropogenic stressors selects for higher stress tolerance. I also tested whether parental prolonged diapause or inse…

Load-dependent alpha suppression is related to working memory capacity for numbers

2022

Alpha suppression is proposed to reflect a surge in cortical excitability to enhance stimulus processing in working memory. The attenuated state of alpha might reflect the prioritisation of behaviourally relevant information, making it a proxy for working memory functioning. Despite the growing interest in utilising the advancement of brain-based measures to evaluate individuals’ cognitive processes, there was a lack of consistent evidence on the relationship between alpha suppression and working memory performance. To investigate whether interindividual differences in alpha suppression might be related to variability in working memory capacity, we recorded participants’ electroencephalogra…

Tyypillisten biomassamateriaalien kemiallinen koostumus

2009

Biokaasuntuotanto naudan kuivikelannasta

2010

Naudan kuivikelantaa muodostuu navetoissa, joissa käytetään kuivikkeita, kuten olkea, turvetta tai kutterinpurua. Kuivikelanta voi lannan lisäksi sisältää myös virtsaa. Mikäli virtsa imeytetään kuivikkeisiin, kuivikelantaa muodostuu tilalla vuoden aikana noin kaksinkertainen tilavuus verrattuna tilanteeseen, jossa virtsa erotellaan lannasta. Käsittelemällä kuivikelanta anaerobisesti saadaan metaania, jota polttoaineena käyttämällä voidaan vähentää kasvihuonekaasupäästöjä. Tässä tutkimuksessa määritettiin viiden erilaisen kuivikelannan, viiden kuivikkeen sekä säilörehun metaanintuottopotentiaalit. Lisäksi testattiin yhden kuivikelannan soveltuvuutta biokaasuntuotantoon kokeilumittakaavan rea…

Applicability of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) bark extract as a precursor of rigid carbon foam and activated carbon

2023

Hybrid aspens have long attracted scientific interest, but the research on their use as feedstocks for chemical applications are still very limited. The bark biomass of the poplar species contains many valuable extractives that can be utilized as value-added products. This paper examines the applicability of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) bark extract as a precursor of rigid carbon foam and activated carbon. To explore this, the study considers 1) the basic chemical composition of the bark in terms of added value potential, 2) the basic chemical composition of the bark extract and the effect of its pretreatment on the extract composition, 3) the production of rigi…