Search results for "MNA"

Strongly decelerated expansion of SN 1979C

2002

We observed SN1979C in M100 on 4 June 1999, about twenty years after explosion, with a very sensitive four-antenna VLBI array at the wavelength of 18cm. The distance to M100 and the expansion velocities are such that the supernova cannot be fully resolved by our Earth-wide array. Model-dependent sizes for the source have been determined and compared with previous results. We conclude that the supernova shock was initially in free expansion for 6 +/- 2 yrs and then experienced a very strong deceleration. The onset of deceleration took place a few years before the abrupt trend change in the integrated radio flux density curves. We estimate the shocked swept-up mass to be about 1.6 solar masse…

Bezpieczeństwo młodzieży gimnazjalnej województwa opolskiego w cyberprzestrzeni

2017

Przedmiotem niniejszego artykułu jest bezpieczeństwo młodzieży gimnazjalnej w Internecie, w województwie opolskim. W kwietniu 2016 r. przeprowadzono anonimowe badanie nad poczuciem bezpieczeństwa w sieci uczniów wybranych szkół gimnazjalnych, w klasach od I do III. Na ankiety odpowiedziało 799 uczniów, w tym 393 kobiet i 406 mężczyzn. Z badań wynika, że wszyscy badani korzystają z Internetu, większość z nich codziennie. Poczucie bezpieczeństwa wśród badanych jest wysokie. Większość uczniów korzysta z Internetu zarówno dla rozrywki i aby przygotować się do zajęć w szkole. Warto zauważyć, że młodzież w wieku gimnazjalnym bardzo dużo czasu poświęca na rozrywkę w Internecie. Większość ankietowa…

Naciones Unidas / 1. El naufragio

2005

Velando armas

2002

Keratin 7 expression as an early marker of reflux-related columnar mucosa without intestinal metaplasia in the esophagus

2009

BACKGROUND: The role of Barrett esophagus in carcinogenesis is widely accepted, but the significance of esophageal columnar mucosa without histological intestinal metaplasia, known as columnar-lined esophagus, is debated. MATERIAL/METHODS: We studied 128 patients free of Helicobacter pylori with reflux-related symptoms and columnar mucosa in the esophagus at endoscopy, 106 patients with Barrett esophagus (referred to as the Barrett group) and 22 patients without intestinal metaplasia (columnar group). Samples from 20 subjects free of H. pylori were used as controls. Immunostaining for keratin 7 (KRT7), keratin 20 (KRT20), caudal type homeobox 2 (CDX2), mucin 2, oligomeric mucus/gel-forming …

Do Age and Sex Play a Role in the Intraocular Pressure Changes after Acrobatic Gymnastics?

2021

To evaluate the effects of an acrobatic gymnastics (AG) training session on intraocular pressure (IOP), a familiarization session was employed to confirm the participant’s suitability for the study. Forty-nine gymnasts (63.27% females, 18–40 years old) voluntarily agreed to participate. As age, sex, baseline IOP, and central corneal thickness (CCT) were considered as potential predictors of the IOP variations, in the second session measurements of the above parameters were taken before and after 90 min of AG. A mixed-factorial analysis of variance evaluated differences. Linear regression was conducted to potentially predict the IOP variation with the exercise. After the scheduled exercise, …

Cría cuervos...

2001

Experimental and DFT Studies on Competitive Heterocyclic Rearrangements. A Cascade Isoxazole-1,2,4-Oxadiazole-Oxazole Rearrangement

2009

The thermal rearrangements of 3-acylamino-5-methylisoxazoles 1 have been investigated under basic and neutral conditions and interpreted with the support of computational data. The density functional theory (DFT) study on the competitive routes available for the base-catalyzed thermal rearrangement of isoxazoles 1 showed that the Boulton-Katritzky (BK) rearrangement, producing the less stable 3-acetonyl- 1,2,4-oxadiazoles 5, is a much more favored process than either the migration-nucleophilic attack-cyclization (MNAC) or the ring contraction-ring expansion (RCRE). In turn, an increase in reaction temperature will promote the MNAC of oxadiazoles 5, producing the more stable 2-acylaminooxazo…

Programm des städtischen Realgymnasiums zu Riga, 1865

1865

Inhalt: 1. H.W. Longfellow / vom Gymnasial-Lehrer A. Rieke -- 2. Schulnachrichten / vom Director

Die alte Domschule und das daraus hervorgegangene Stadt-Gymnasium zu Riga: zur Erinnerung an die erste Begründung der Domschule vor 700 Jahren und an…

1910

Inhalt: 1. Teil. 1211-1804 in zweiter, bedeutend erweiterter Auflage ; 2. Teil. 1804-1896.