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We have investigated, comparatively, the ontogenetic development of the compound eye in larvae of a mysid (Neomysis) and a euphausiid (Thysanoessa) species and found it to be close to identical in the two species. The larval eye is of apposition type with special adaptations for planktonic life. The elongated dioptric apparatus is devoid of screening pigment and instead has a proximal lens optical

A Golgi study of the neuronal morphology of the first optic neuropil (lamina) in three anostracan species revealed a close similarity in the lamina construction and neuron types. The lamina architecture of decapod and mysid crustacean species, as revealed by the Golgi method, conformed to previous studies and differed from the anostracans. The comparison was made at the level of resolution compris

Antiserum against bovine retinal S-antigen, a soluble protein (MW = 50 kDa) thought to be involved in phototransduction, was used in an immunohistochemical and immunochemical study of vertebrate eyes and pineal systems and invertebrate photoreceptor organs. Positive reactions, not seen with antiserum preabsorbed with highly purified S-antigen, were observed in planarian and starfish ocelli; scallo

The ultrastructure of the compound eye of an ascothoracid larva — the only known occurrence of compound eyes in the Ascothoracida — is described. The ommatidia of apposition type consist of a crystalline cone composed of three cells and up to six retinular cells. Poor fixation of the scarce material allows no safe judgement about the number of retinular cells and the nature of two distal cells sur

Syftet med artikeln är, som syns i titeln, att ge en övergripande genomgång om den kunskap som finns om kristna migranter i Sverige. Området är aktuellt och relevant, men förvånansvärt lite utforskat. Det innehåller emellertid en rad begreppsmässiga svårigheter som först behöver redas ut, för att sedan visa hur det ser ut i Sverige idag utifrån den begränsade kunskap vi har. Avslutningsvis kommer

This paper reviews path-creation processes in road transport systems in the Nordic countries: e-mobility in Denmark, hydrogen and fuel-cell electrical vehicles in Norway, and advanced biofuels in Finland and Sweden. The study builds on the path creation literature, which seeks to explain the emergence of new technological pathways. Drawing on recent insights concerning the differences between desi

BackgroundPeople with intellectual disability have been found to have higher prevalence of psychiatric disorders than the general population. However, they do not seem to have a corresponding increase in psychiatric care utilization. The aim of the present study was to investigate psychiatric care utilization among older people with intellectual disability.MethodsWe used a cohort of people with in

Today, there is good knowledge of the physiological basis of bird colour vision and how mathematical models can be used to predict visual thresholds. However, we still know only little about how colour vision changes between different viewing conditions. This limits the understanding of how colour signalling is configured in habitats where the light of the illumination and the background may shift

This article provides a comprehensive critique of current corporate foreign exchange risk management (FXRM) practices. The authors characterize much of FXRM as a “legacy” activity, a set of outdated, often decentralized and “earnings-driven” methods and procedures that have not been subjected to rigorous cost-benefit analysis at the enterprise level. And according to the authors, the costs of poor

According to the cost-of-capital hypothesis, increased voluntary disclosure should reduce information asymmetries, lower the cost of capital, and increase firm value. The optimal-disclosure hypothesis, however, predicts that costs related to voluntary disclosure lead to the existence of an interior optimum of disclosure that maximizes firm value. These hypotheses are empirically tested using a pre

Aspects of laser spectroscopy applied to the biomedical fields are reviewed with examples illustrating the techniques taken mostly from the author's research experience. Basic principles of quantum-mechanical background are described, and powerful implementations in the biophotonics field are discussed.

In this chapter a temperature probing technique based on the spectroscopy of inorganic luminescent materials is described and exemplified in experiments related to combustion. The basic features of thermographic phosphors which enable remote temperature diagnostics to be performed with a high degree of sensitivity and accuracy, are outlined. This technique is superior to those based on thermocoupl

Möjligheten att arbeta till en högre ålder är en komplex och mångdimensionell fråga som inkluderar många faktorer. Den teoretiska modellen som beskrivs visar på komplexiteten Möjligheten att arbeta påverkas på olika nivåer, och det beror inte enbart på individen utan det är i första hand chefer, organisationer och företag som skapar förutsättningarna för de äldre medarbetarna på arbetsplatsen och

There is reason to believe that factors such as physical exertion and behavioural changes will influence the ascending walking speed and ultimately the possibility of satisfactory evacuation. To study these effects, a 2-year research project was initiated with the focus on effects of physical exertion on walking speeds, physiological performance and behaviours during long ascending evacuations. Tw

BACKGROUND: Malignant pediatric brain tumors constitute a heterogeneic group of central nervous system tumors, and general markers of diagnosis and prognosis are not available. Recently, a panel of CD markers (CD15, CD24, CD29) was used to define increasing neural differentiation of embryonic stem cells. Although these CD markers have been associated with worse prognosis due to presence of tumor p