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Most visual systems are more sensitive to luminance than to colour signals. Animals resolve finer spatial detail and temporal changes through achromatic signals than through chromatic ones. Probably, this explains that detection of small, distant, or moving objects is typically mediated through achromatic signals. Macroglossum stellatarum are fast flying nectarivorous hawkmoths that inspect flower

Coordination of apical constriction in epithelial sheets is a fundamental process during embryogenesis. Here, we show that DRhoGEF2 is a key regulator of apical pulsation and constriction of amnioserosal cells during Drosophila dorsal closure. Amnioserosal cells mutant for DRhoGEF2 exhibit a consistent decrease in amnioserosa pulsations whereas overexpression of DRhoGEF2 in this tissue leads to an

Indoor air pollution is a problem of great concern, estimating to cause around 2 million premature deaths, with 400.000 cases suspected to happen in Sub-Saharan Africa. In this thesis, indoor air pollution emissions associated with the Ethiopian traditional coffee ceremony has been studied as a model for cooking exposure. Coffee preparation is a ceremony which is conducted in almost every Ethiopia

Bacteria in drinking water distribution systems have aroused considerable attention due to the potential public health risks. Drinking water presents a low-nutrient environment in which various bacterial populations proliferate. Water treatment plants are designed and operated to produce safe drinking water and to protect the drinking water from microbial contamination. To ensure the safety of the

Den här uppsatsen behandlar hur palaeocopa ostrakodfossil av familjen Beyrichiidae, avsatta i sensilurisk lagerföljd på Gotland, påverkades av den så kallade Laukatastrofen som ägde rum i sen Ludlow. I lagerföljd avsatt under Laukatastrofen har bland annat anomalier i kolisotop, litologiförändringar och faunaförändringar påvisats, vilka är relaterade till globala havsnivåförändringar och en glaciaThis paper deals with how palaeocope ostracodes of the family Beyrichiidae, from the Silurian strata at Gotland were affected by the Late Silurian Lau Event. The Lau Event is associated with a positive carbon isotope excursion, lithology changes and faunal changes in accumulated strata related to sea-level changes and a glaciation in the Late Ludlow. In order to find out how the beyrichiid faunas

This thesis explores how a blackout can be better managed using existing public transport company resources. The study addresses three research questions by assessing the feasibility of possible cooperation between local public transport companies and disaster management authorities during a blackout. Data from 14 interviews with experts from disaster management authorities, public transport com

The aim of this study is to investigate Swedish upper secondary English teachers’ attitudes towards and use of Swedish in the EFL classroom. In addition to examining teachers’ attitudes, the study investigated when teachers feel it is beneficial to use Swedish and why in these specific situations. Five upper secondary English teachers participated in the study. The study was conducted by observing

Palaeoecological methods were applied to peat and sediment cores recovered from one bog (Bråtamossen) and two lakes (Avegöl and Femtingagölen) in the Småland Uplands, southern Sweden. The general aim was to reconstruct the landuse and vegetation history for the last 6000 years in this agriculturally marginal region. The main technique was pollen analysis, which was complemented by mineral magnetic

Patients and Interventions. Tissue damage caused by brain retraction was evaluated utilizing intracerebral microdialysis in six patients operated on subfrontally for pituitary adenoma. The microdialysis probes (membrane length 10 mm, cut-off 20 kDalton) were placed in cerebral cortex beneath the brain retractor and perfused with Ringer solution at 0.3 mul/min. The microdialysis vials were changed

A new laboratory reactor to perform in situ studies of structural changes in wood during soda pulping using synchrotron X-ray tomography is presented. The reactor is of recirculation type to provide stable reaction conditions and mimic the industrial situation. Experiments have been performed using this reactor in situ at a synchrotron microtomography beamline to provide sequences of 3D images fro

A better physical understanding of mesoscale and microscale mechanisms behind deformation and failure of paperboard material is important to optimize industrial packaging converting processes and decrease waste. In this study, these mechanisms were investigated using synchrotron X-ray tomography during in situ continuous uniaxial tensile loading. High spatial and temporal data resolution enabled q

We present a brief review of literature related to blogs and news sites; our focus is on publications related to COVID-19. We primarily focus on the role of blogs and news sites in disseminating research on COVID-19 to the wider public, that is knowledge transfer channels. The review is for researchers and practitioners in scholarly communication and social media studies of science who would like

Over the past decade, our understanding of brain-waste clearance underwent a revolution after the discovery of the so-called glymphatic system. The glia-lymphatic (abbreviated, glymphatic) system was first described in 2012 as a paravascular macrosystem involved in the distribution of nutrients and clearance of metabolic waste from the brain parenchyma. The main actor of the system is the cerebros

Previous research has extensively explored the role of anxiety, disgust, guilt, and shame in obsessive-compulsive (OC) symptoms, but few studies have investigated anger and associated vengeful motivations, especially during adolescence, when OC symptoms typically onset. This is unfortunate as anger is a key human emotion linked to various aspects of behaviour. Our aim was to explore how anger and