Search results for "NEB"
showing 10 items of 543 documents
The Gaia-ESO Survey: Dynamics of ionized and neutral gas in the Lagoon nebula (M 8)
2017
Aims. We present a spectroscopic study of the dynamics of the ionized and neutral gas throughout the Lagoon nebula (M 8), using VLT-FLAMES data from the Gaia-ESO Survey. The new data permit exploration of the physical connections between the nebular gas and the stellar population of the associated star cluster NGC 6530. Methods. We characterized through spectral fitting emission lines of Hα, [N II] and [S II] doublets, [O III], and absorption lines of sodium D doublet, using data from the FLAMES-Giraffe and UVES spectrographs, on more than 1000 sightlines toward the entire face of the Lagoon nebula. Gas temperatures are derived from line-width comparisons, densities from the [S II] doublet …
Gaia-ESO Survey: Gas dynamics in the Carina nebula through optical emission lines
2016
Aims. We present observations from the Gaia-ESO Survey in the lines of Hα, [N II], [S II], and He I of nebular emission in the central part of the Carina nebula. Methods. We investigate the properties of the two already known kinematic components (approaching and receding), which account for the bulk of emission. Moreover, we investigate the features of the much less known low-intensity high-velocity (absolute RV >50 km s) gas emission. Results. We show that gas giving rise to Hα and He I emission is dynamically well correlated with but not identical to gas seen through forbidden-line emission. Gas temperatures are derived from line-width ratios, and densities from [S II] doublet ratios. Th…
Tienpientareiden merkitys vaihtoehtoisina elinympäristöinä perinneympäristöjen luteille
2015
Lajistollinen monimuotoisuus vähenee maailmanlaajuisesti kiihtyvällä vauhdilla, etenkin ihmistoiminnasta aiheutuvan laajamittaisen elinympäristöjen tuhoutumisen ja huonontumisen johdosta. Niin Suomessa, kuin myös muualla Euroopassa, maatalouden tehostuminen viimeisen sadan vuoden aikana on johtanut perinteisen karjatalouden synnyttämien perinneympäristöjen rajuun vähenemiseen. Monet jäljellä olevat perinneympäristöt kärsivät lisäksi elinympäristön laadullisesta huonontumisesta, kuten umpeenkasvusta, rehevöitymisestä, sekä vieraslajien invaasioista. Perinneympäristöjen tuhoutuessa ja huonontuessa ovat myös monet niillä elävistä eliölajeista taantuneita tai luokiteltu uhanalaisiksi. Uhanalais…
Histochemical and biochemical investigations concerning the function of larval oenocytes of Tenebrio molitor L. (Coleoptera, Insecta).
1980
Larval oenocytes of Tenebrio molitor were investigated histochemically. In contrast to the lipid droplets of the fat body, they did not stain with Sudan black. A positive reaction for lipoproteins appeared only after destructive oxidation with sodium hypochlorite. These lipoproteins are the remnants of degenerated membranes, as revealed by ultrastructural analysis. Polyphenols could be identified in the exocuticle of exuvia, and in the newly formed procuticle. Endocuticle, epidermis and oenocytes showed no staining reaction. In oenocytes a great amount of lipase is also present which could be detected with several Tweens as substrates. The significance of these lipases remains unclear, sinc…
Highlights from the ARGO-YBJ Experiment
2012
""The ARGO-YBJ experiment at YangBaJing in Tibet (4300m a.s.l.) has been taking data with its full layout since October 2007. Here we present a few significant results obtained in gamma-ray astronomy and cosmic-ray physics. Emphasis is placed on the analysis of gamma-ray emission from point-like sources (Crab Nebula, MRK 421), on the preliminary limit on the antiproton\\\/proton flux ratio, on the large-scale cosmic-ray anisotropy and on the proton-air cross-section. The performance of the detector is also discussed, and the perspectives of the experiment are outlined.""
Primi sondaggi sul testimone J del volgarizzamento catalano della Consolatio Philosophiae
2015
Abstract: La vicenda testuale del volgarizzamento catalano del De consolatione philosophiae di Boezio si caratterizza per la problematicita dei suoi aspetti redazionali e per la complessita della sua tradizione manoscritta. Il perduto testo originale di questa traduzione, realizzata dal frate domenicano Pere Saplana in un periodo compreso tra il 1358 e il 1362, si e infatti conservato in due redazioni differenti. La prima (?), anonima, e tramandata da un testimone completo in castigliano e da un frammento catalano. La seconda (?), tradita da un numero elevato di testimoni, e invece il risultato di un lavoro di revisione operato sul testo di Saplana dal domenicano Antoni Ginebreda (1390 c. )…
How to Become an Author: The Poet Isa Asp and Her Childhood Fascination with Writing for Magazines
2021
In this article the author explores the early development of the identity as a writer of a Finnish-speaking poet Lovisa (or Isa) Asp (1853–1872). She wrote her lyrics in the Finnish language in the 1870s, and she is regarded as the first 19th-century female Finnish poet (whose works were published in Finnish). She began writing poetry (initially in Swedish) as a teenager and started her literary career as a contributor to children’s magazines. Asp began her studies at the Teacher Training College in Jyväskylä in autumn 1871 with the aim of working as an elementary school teacher, but she also dreamt of becoming an established writer someday. Unfortunately, her early death meant that most of…
Modeling the mixed-morphology supernova remnant IC 443. Origin of its complex morphology and X-ray emission
2020
The morphology and the distribution of material observed in SNRs reflect the interaction of the SN blast wave with the ambient environment, the physical processes associated with the SN explosion and the internal structure of the progenitor star. IC 443 is a MM SNR located in a quite complex environment: it interacts with a molecular cloud in the NW and SE areas and with an atomic cloud in the NE. In this work we aim at investigating the origin of the complex morphology and multi-thermal X-ray emission observed in SNR IC 443, through the study of the effect of the inhomogeneous ambient medium in shaping its observed structure, and the exploration of the main parameters characterizing the re…
PO-CALC: A novel tool to correct common inconsistencies in the measurement of phenoloxidase activity
2015
Abstract A broad range of physiological and evolutionarily studies requires standard and robust methods to assess the strength and activity of an individual’s immune defense. In insects, this goal is generally reached by spectrophotometrically measuring (pro-) phenoloxidase activity, an enzymatic and non-specific process activated after wounding and parasite infections. However, the literature surprisingly lacks a standard method to calculate these values from spectrophotometer data and thus to be able to compare results across studies. In this study, we demonstrated that nine methods commonly used to extract phenoloxidase activities (1) provide inconsistent results when tested on the same …
Quantitative studies of the secretion of complement component C3 by resident, elicited and activated macrophages. Comparison with C2, C4 and lysosoma…
1982
To quantitate the secretion of complement component C3 by guinea pig peritoneal macrophages an enzyme-linked immunosorbent assay was developed. C3 secretion was studied in resident, elicited and activated macrophages and compared with release of hemolytically active C2 and C4, as well as the lysosomal enzyme β-D-2-acetamido-2-deoxyglucosidase. Resident macrophages secreted about 6 ng C3/106 cells/h into culture supernatants over a period of 12 h. Corynebacterium parvum-activated cells were found to secrete 3 times that amount at nearly constant rates. There was a stepwise increase in secretion of functional C2 and C4 when comparing resident, elicited and activated macrophages; secretion was…