Search results for " Structures"
showing 10 items of 4162 documents
Primo ricerche sulla ultrastruttura dell'uovo delle Ascidie
1959
Summary The cytoplasmic constituents of the unfertilized eggs of Ciona intestinalis were separated by centrifugation and studied at the electron microscope, with the following results. Lipid droplets collect at the centripetal pole; they are boundered by a thin membrane. The yolk granules are homogeneous in appearance; a few have a granular structure. Mitochondria contain numerous cristae; they accumulate in two different layers centripetally and centrifugally to the yolk granules layer respectively. Basophilic material collects at both poles of the egg in two hyaline caps: a centripetal one constituted by small Vesicles and a centrifugal represented by dense clumps. The latter, as well as …
A morphometric comparison of dissimilar early development in sibling species of Platynereis (Annelida, Polychaeta)
1992
Early development of Platynereis massiliensis was studied in serial sections of fixed embryos and in living or fixed embryos whose nuclei had been made visible with a fluorescent label. The unfertilized egg is an ellipsoid with three axes of differing length. The longest axis corresponds to the dorsoventral axis of the developing embryo. Egg volume is ten times that in the sibling species, P. dumerilii, mainly due to increased yolk content. The timing and spatial pattern of cleavage were observed from first cleavage to the 62-cell stage. Volumes of the blastomeres, their nuclei, their yolk-free cytoplasm and their yolk were determined from serial sections up to the 29-cell stage. In the P. …
SOME COMPARATIVE REMARKS ON THE TRANSIENT CHANGE IN LACTIC ACID CONTENT IN SEA URCHIN EGGS FOLLOWING FERTILIZATION.
1964
Abstract During the first few minutes following fertilization a transient increase in the concentration of lactic acid occurs in the eggs of Arbacia lixula , whereas no change at all is observed in the eggs of Paracentrotus liuidus . In the eggs of Psammechinus miliaris there is a transient decrease, soon followed by a recovery so that the level of the unfertilized egg is again reached.
Food colour additives of natural origin
2015
Abstract Colour is an often overlooked sensory character that certainly influences flavour perception. Pigments colouring food are generally unstable and are modified during processing. To maintain or restore product colour uniformity, colouring agents, considered worldwide as food additives, are intentionally added to food products. The natural food additives market has been growing extensively since the last century due to the potential hazards of artificial food additives and the potential benefits of biologically active compounds. In this chapter, a fairly compressed overview of the most important colours of natural origin as well as information about less common or/and promising colour…
Dix ans d'archéologie forestière dans le Châtillonnais (Côte-d'Or) : enclos, habitats, parcellaires
2010
National audience; Ces recherches sur les ensembles de structures de pierre sous forêt sont mises en œuvre depuis dix ans et sont inté- grées depuis 2003 dans le P.C.R. ‘Vix et son Environnement', dirigé par C. Mordant, S. Wirth et B. Chaume. Les vestiges étudiés sont implantés dans deux milieux géographiques distincts mais contigus : le plateau calcaire recouvert par la forêt domaniale de Châtillon, et les rebords de la Digeanne et du Brevon qui entaillent ce plateau à l'est et au sud. La prospection présente ici des caractères particuliers liés au couvert forestier. Les relevés G.P.S. sont intégrés dans un S.I.G. et constituent la base de cette étude, dans un va et vient…
An interactional ‘live eye tracking’ study in autism spectrum disorder : combining qualitative and quantitative approaches in the study of gaze
2017
Recent studies on gaze behaviours in individuals with autism spectrum disorder (ASD) have utilised “live eye tracking.” Such research has focused on generating quantitative eye tracking measurements, which provide limited (if any) qualitative contextual details of the actual interactions in which gaze occurs. This article presents a novel methodological approach that combines live eye tracking with qualitative interaction analysis, multimodally informed conversation analysis. Drawing on eye tracking and wide-angle video recordings, this combination renders visible some of the functions, or what gaze “does,” in interactional situations. The participants include three children with ASD and th…
Spatial and temporal pattern of neuroblasts, proliferation, and Engrailed expression during early brain development in Tenebrio molitor L. (Coleopter…
2003
Abstract In insects, the knowledge of embryonic brain development is still fragmentary, and comparative data are scarce. In this study, we explored aspects of embryonic brain development in the coleopteran Tenebrio molitor . A detailed description is provided of the spatial and temporal pattern of the embryonic brain neuroblasts during 18–60% of embryonic development. Approximately 125 brain NBs have been identified in each hemisphere of the brain at about 40% of embryonic development. A subset of five neuroblasts, among them the two progenitors of the mushroom bodies and two progenitors of the larval antennal lobe, are morphologically identifiable by their larger size. As revealed by incor…
Ģeogrāfiskās nomenklatūras vārdi latviešu toponīmijā
2014
Sanda Rapa ĢEOGRĀFISKĀS NOMENKLATŪRAS VĀRDI LATVIEŠU TOPONĪMIJĀ Anotācija Pētījumā apkopoti, sistematizēti un etimoloģiskā, areālā, derivatīvā un semantiskā aspektā analizēti LU Latviešu valodas institūta vietvārdu kartotēkā un dažādos citos avotos fiksētie ģeogrāfiskās nomenklatūras vārdi jeb saliktā vietvārdā ietilpstošie sugasvārdi un to varianti. Analizējot ģeogrāfisko apelatīvu etimoloģiju, raksturota to etimoloģiskā statistika un galvenie aizguvumu ceļi. Noteiktas galvenās izplatītāko areālismu izoglosas. Aplūkoti raksturīgākie nomenklatūras vārdu derivācijas paņēmieni. Raksturoti specifiskie onomastiskie procesi toponīmijā, pievēršot īpašu uzmanību nomenklatūras vārdu semantiskajām p…
MOESM7 of Histone macroH2A1.2 promotes metabolic health and leanness by inhibiting adipogenesis
2016
Additional file 7. Figure S6. Histogram representing the distance and the frequency of macroH2A1.2-binding regions from transcriptional starting site (TSS), genome-wide.
Additional file 1: Figure S1. of Coinfection outcome in an opportunistic pathogen depends on the inter-strain interactions
2017
Bacterial densities (mean ± S.E.M.) of dose controls of strains A, B and C of Flavobacterium columnare in the growth experiment. The average optical density of the cultures is on the Y-axis, and culture time on the X-axis. (DOC 65 kb)