Search results for "MST"
showing 10 items of 363 documents
Models and Astrophysical Parameters of High Mass X-ray Binaries
1996
The objective of this work is the High Mass X-ray Binaries. These systems consist of a neutron star orbiting around a star of spectral type OB. According to the luminosity class of the optical companion they split into Supergiant X-ray binaries and Be/X-ray systems. In both systems the high energy radiation is due to the accretion phenomenum, but in the first case the accreted metter comes from the strong stellar wind of the primary and in the second case it comes from the circumstellar envelope surrounding the Be star equator. In this work I concentrate on the optical and infrared bands of the electromagnetic spectrum although a discussion of the X-ray characteristics for some systems is a…
Circumstellar Disks in the Outer Galaxy: the Star-Forming Region NGC 1893
2008
It is still debated whether star formation process depends on environment. In particular it is yet unclear whether star formation in the outer Galaxy, where the environmental conditions are, theoretically, less conducive, occurs in the same way as in the inner Galaxy. We investigate the population of NGC1893, a young cluster ~3-4 Myr in the outer part of the Galaxy (galactic radius >11 Kpc), to explore the effects of environmental conditions on star forming regions. We present infrared observations acquired using the IRAC camera onboard the Spitzer Space Telescope and analyze the color-color diagrams to establish the membership of stars with excesses. We also merge this information with …
M Stars in the TW Hya Association: Stellar X-rays and Disk Dissipation
2016
To investigate the potential connection between the intense X-ray emission from young, low-mass stars and the lifetimes of their circumstellar, planet-forming disks, we have compiled the X-ray luminosities ($L_X$) of M stars in the $\sim$8 Myr-old TW Hya Association (TWA) for which X-ray data are presently available. Our investigation includes analysis of archival Chandra data for the TWA binary systems TWA 8, 9, and 13. Although our study suffers from poor statistics for stars later than M3, we find a trend of decreasing $L_X/L_{bol}$ with decreasing $T_{eff}$ for TWA M stars wherein the earliest-type (M0--M2) stars cluster near $\log{(L_X/L_{bol})} \approx -3.0$ and then $\log{(L_X/L_{bol…
Glutathione content of V79 cells in two- or three-dimensional culture
1997
The cellular glutathione (GSH) content of two- and three-dimensional cell cultures of V79 hamster lung cells has been studied. As previously described, cells in monolayer cultures show a decrease in GSH when they reach the confluent state. Three-dimensional cell cultures (multicell spheroids) allow a smoother transition from the initial proliferating to the nonproliferating status, and they show a central area of necrosis when a certain diameter is reached. Cellular GSH content in spheroids is variable throughout the culturing period: 1) GSH content (expressed per mg protein) is lower in spheroids with central necrotic areas than in smaller spheroids without necrosis, and 2) results expres…
Biežāk pielietotāko izmeklēšanas darbību īpatnības pirmstiesas kriminālprocesā
2018
Darba autors ir izvēlējies rakstīt bakalaura darbu par tematu “Biežāk pielietotāko izmeklēšanas darbību īpatnības pirmstiesas kriminālprocesā ”. Autors uzskata, ka pētījums par šādu tematu ir, bija un būs aktuāls, kamēr vien būs noziedzīgie nodarījumi, kurus izmeklēt. Pētījuma mērķis ir izpētīt izmeklēšanas darbību veikšanas priekšnosacījumus, likumā noteiktos to īstenošanas noteikumus, kā arī taktiskos paņēmienus šo darbību pielietošanai. Pētījumā tiek apskatīti izmeklēšanas darbību jēdziens, to veikšanas vispārīgie noteikumi, kā arī biežāk pielietotākās izmeklēšanas darbības: pratināšana, kratīšana un apskate. Ikvienam būtu jāizprot šo izmeklēšanas darbību būtība, jo pat, ja persona ikdie…
Correlation of the Extent of Fjord-Region Oxidation with DNA Binding and Mutagenicity of the Enantiomeric 11,12-Dihydrodiols of Dibenzo[a,l]pyrene
1996
Abstract In vitro studies on the hepatic biotransformation of the enantiomeric trans-11,12-dihydrodiols of dibenzo[a,l]pyrene (DB[a,l]P) using microsomal fractions of animals pretreated with Aroclor 1254 revealed that the formation of fjord-region dihydrodiol epoxides strongly depends on the absolute configuration of the substrate. Both the (-)-11R,12R- and the (+)-11S,12S-enantiomer are converted diastereoselectively to the (-)- and (+)-anti-dihydrodiol epoxide, respectively, by either rat or mouse liver microsomes. Fjord-region oxidation occurs to greatest extent on incubation of the (-)-11R,12R-dihydrodiol with preparations from rats. This finding is in line with the differences seen for…
Investigations on the Mechanism of Induction of the Alkaline Phosphatase by Bromodesoxyuridine in Herpes simplex Virus Transformed Cells and the Tran…
1980
Addition of BrdUrd in combination with prednisolone to HSVi-transformed hamster embryo cells induces an alkaline phosphatase (AP). FdUrd enhances, dThd reduces the inducing capacity of BrdUrd and prednisolone. Induction is prevented by addition of cycloheximide or of cytosine arabinoside. BrdUrd reduces transport and phosphorylation of exogenously applied labeled Urd, especially the amount of UTP, UDP and Urd-diphosphate sugars. The Lineweaver-Burk-plot of uridine-uptake after addition of BrdUrd reveales the characteristics of the mixed type inhibition (competitive-noncompetitive).
Gemstones and geosciences in space and time
2013
Abstract The gemstones, covering the spectrum from jeweler's to showcase quality, have been presented in a tripartite subdivision, by country, geology and geomorphology realized in 99 digital maps with more than 2600 mineralized sites. The various maps were designed based on the “Chessboard classification scheme of mineral deposits” proposed by Dill (2010a, 2010b) to reveal the interrelations between gemstone deposits and mineral deposits of other commodities and direct our thoughts to potential new target areas for exploration. A number of 33 categories were used for these digital maps: chromium, nickel, titanium, iron, manganese, copper, tin–tungsten, beryllium, lithium, zinc, calcium, bo…
Når preposisjonar erstattar kasus : om preposisjonsobjekt (objektsadverbial) frå norrønt til moderne norsk
2006
Masteroppgave i Nordisk språk og litteratur 2006 - Høgskolen i Agder, Kristiansand Dette arbeidet har to hovuddelar. Den første delen er ei valensundersøking. Formålet med denne undersøkinga er å finne ut kva for valens verb som i moderne norsk krev preposisjonsobjekt, hadde på det norrøne språksteget. Den andre hovuddelen er ein analyse av preposisjonsobjekt i moderne norsk, med grunnlag i det teoretiske rammeverket i arbeidet, Lexicase Dependency Grammar (Starosta 1988). Sentrale prinsipp i Lexicase Dependency Grammar (LCDG) blir presenterte i kap. 2. I dette kapittel blir også metodiske spørsmål i samband med valensundersøkinga diskuterte, og korpusa som dannar grunnlag for undersøkingan…
Educators and activists: educating for life through work in work integration enterprises
2018
Este artículo se centra en el derecho a la educación para personas que viven en contextos de vulnerabilidad, en sintonía pero diferente a la aproximación de Escudero: en primer lugar, es una mirada sobre la educación no de jóvenes sino de personas adultas, muchas de ellas con trayectorias educativas truncadas, y todas ellas tras haber pasado por situaciones vitales que bien pueden calificarse de marginación y exclusión. En segundo lugar, ofrece una mirada a la práctica educativa en un contexto no escolar, sino productivo, ya que pone el foco de atención sobre el aprendizaje, tanto intencional como informal, que tiene lugar en empresas de inserción. En tercer lugar, nuestra perspectiva es la…