12,257 Hits in 2.4 sec

Frelsi, menning, framför: Um bréf og greinar Jóns Halldórssonar

Kirsten Wolf
2018 Scandinavian Studies  
For reasons that will probably never be known, Jón Halldórsson's plans to write an autobiography never materialized.  ...  Frelsi, menning, framför is essentially the story of Jón Halldórsson (1838Halldórsson ( -1919)), who, in 1872, emigrated from Stóruvellir in Bárðardalur to the united States.  ...  Kirsten Wolf University of Wisconsin-Madison Downloaded from by guest on 26 March 2022 Downloaded  ... 
doi:10.5406/scanstud.90.2.0307 fatcat:qblwgxbow5cjvbnlhhimdawmie

Limits in PMF of Teichmuller geodesics [article]

Jon Chaika, Howard Masur, Michael Wolf
2014 arXiv   pre-print
We consider the limit set in Thurston's compactification PMF of Teichmueller space of some Teichmueller geodesics defined by quadratic differentials with minimal but not uniquely ergodic vertical foliations. We show that a) there are quadratic differentials so that the limit set of the geodesic is a unique point, b) there are quadratic differentials so that the limit set is a line segment, c) there are quadratic differentials so that the vertical foliation is ergodic and there is a line segment
more » ... as limit set, and d) there are quadratic differentials so that the vertical foliation is ergodic and there is a unique point as its limit set. These give examples of divergent Teichmueller geodesics whose limit sets overlap and Teichmueller geodesics that stay a bounded distance apart but whose limit sets are not equal. A byproduct of our methods is a construction of a Teichmueller geodesic and a simple closed curve γ so that the hyperbolic length of the geodesic in the homotopy class of gamma varies between increasing and decreasing on an unbounded sequence of time intervals along the geodesic.
arXiv:1406.0564v1 fatcat:c6daghq33nakpaydcneec554zy


Jon C. Mauerhan, Stefanie Wachter, Patrick W. Morris, Schuyler D. Van Dyk, D. W. Hoard
2010 Astrophysical Journal Letters  
We have spectroscopically discovered a pair of twin, nitrogen-type, hydrogen-rich, Wolf-Rayet stars (WN8-9h) that are both surrounded by circular, mid-infrared-bright nebulae detected with the Spitzer  ...  Two other evolved massive stars have also been identified within the area subtended by the nebulae, including a carbon-type Wolf-Rayet star (WC8) and an O7-8 III-I star, the latter of which appears to  ...  this source (O star of uncertain luminosity class), we derived M K by using the extinction for this source and the average distance for the three Wolf-Rayet stars in the table (4.9 ± 1.2 kpc).  ... 
doi:10.1088/2041-8205/724/1/l78 fatcat:swl3urfre5dojcqa2hha2ui55y

New Galactic Wolf-Rayet Stars Discovered via 2MASS + Spitzer

Jon C. Mauerhan, Schuyler D. Van Dyk, Pat W. Morris
2009 Proceedings of the International Astronomical Union  
We report new results from our effort to identify obscured Wolf-Rayet stars (WRs) in the Galaxy.  ...  A WC8 star in our sample appears to be a member of the stellar cluster Danks 1, in contrast to the rest of the confirmed Wolf-Rayet stars that generally do not appear to reside within dense stellar clusters  ... 
doi:10.1017/s1743921310011920 fatcat:lladwvm55zcrtjaxb2vskywgum

Wolf, Canis lupus, Den Site Selection in the Rocky Mountains

Jon R. Trapp, Paul Beier, Curt Mack, David R. Parsons, Paul C. Paquet
2008 Canadian field-naturalist  
Wolf core use areas, including den areas, showed higher intensity of use throughout the year when compared to the entire territory.  ...  Because mortality of Wolves, Canis lupus, is highest during the first six months of life, den site selection may affect reproductive success of Wolf populations.  ...  Fish and Wildlife Service, the Wolf Education and Research Center, and Yellowstone, Glacier, Banff National Parks, and Montana Fish, Wildlife & Parks.  ... 
doi:10.22621/cfn.v122i1.543 fatcat:cqb5e6oevrcnvkj472dg4q32ne

Estrogenic Regulation of the GnRH Neuron

Sally Radovick, Jon E. Levine, Andrew Wolfe
2012 Frontiers in Endocrinology  
., 1994; Wolfe et al., 1995; Kim et al., 2007 ; −3446/+5-luc mice). These GnRH promoter elements were shown to specifically and reproducibly target hypothalamic GnRH neurons in transgenic mice.  ...  Chen, M., Wolfe, A., Wang, X., Chang, C., Yeh, S., and Radovick, S. (2009). Generation and characterization of a complete null estrogen receptor alpha mouse using Cre/LoxP technology. Mol. Cell.  ... 
doi:10.3389/fendo.2012.00052 pmid:22654870 pmcid:PMC3356008 fatcat:abeojkleabbwthzxsodtnof75q


Jon C. Mauerhan, Schuyler D. Van Dyk, Patrick W. Morris
2011 Astronomical Journal  
We have spectroscopically identified 60 Galactic Wolf-Rayet (WR) stars, including 38 nitrogen types (WN) and 22 carbon types (WC).  ...  INTRODUCTION Wolf-Rayet (WR) stars are the evolved descendants of the most massive stars (M > 25 M ; see Crowther 2007 , and references therein).  ... 
doi:10.1088/0004-6256/142/2/40 fatcat:cz2jcgpu7baormcdtdw26yg7p4

Wolf and Bear Depredation on Livestock in Northern Sweden 1827–2014: Combining History, Ecology and Interviews

Weronika Axelsson Linkowski, Marie Kvarnström, Anna Westin, Jon Moen, Lars Östlund
2017 Land  
Probably wolf.  ...  Weronika Axelsson Linkowski together with Lars Östlund and Jon Moen developed the ideas for the manuscript. Anna Westin contributed with an agri-historical perspective.  ... 
doi:10.3390/land6030063 fatcat:ujpsxwv4nzhwvo752z2xinohhm

12 New Galactic Wolf-Rayet Stars Identified via 2MASS + Spitzer/GLIMPSE

Jon C. Mauerhan, Schuyler D. Van Dyk, Pat W. Morris
2009 Publications of the Astronomical Society of the Pacific  
We report new results from our effort to identify obscured Wolf-Rayet stars in the Galaxy.  ...  We have confirmed 12 new Wolf-Rayet stars in the Galactic disk, including 9 of the nitrogen subtype (WN), and 3 of the carbon subtype (WC); this raises the total number of Wolf-Rayet stars discovered with  ...  INTRODUCTION Wolf-Rayet stars (WRs) are the post-main-sequence descendants of the most massive stars (M ini ≳ 25 M ⊙ ).  ... 
doi:10.1086/603544 fatcat:4yxryavguvhyfmhjnjoj25heum

Wolf habitat selection when sympatric or allopatric with brown bears in Scandinavia

Andrés Ordiz, Antonio Uzal, Cyril Milleret, Ana Sanz-Pérez, Barbara Zimmermann, Camilla Wikenros, Petter Wabakken, Jonas Kindberg, Jon E. Swenson, Håkan Sand
2020 Scientific Reports  
Otherwise, we did not find any effect of bear presence on wolf habitat selection, in contrast with our previous studies.  ...  Here, we applied resource selection functions and a multivariate approach to compare wolf habitat selection within home ranges of wolves that were either sympatric or allopatric with bears.  ...  The establishment of wolf pairs during the ongoing wolf population recovery, i.e., wolf 2 nd order habitat selection, has been affected positively by previous wolf presence and negatively by road density  ... 
doi:10.1038/s41598-020-66626-1 pmid:32555291 fatcat:dkkaa43m5bagvhv27edwbxooam

Sarcoptic mange in the Scandinavian wolf Canis lupus population

Boris Fuchs, Barbara Zimmermann, Petter Wabakken, Set Bornstein, Johan Månsson, Alina L. Evans, Olof Liberg, Håkan Sand, Jonas Kindberg, Erik O. Ågren, Jon M. Arnemo
2016 BMC Veterinary Research  
Heterogenic infection patterns on the pack level in combination with the importance of individualbased factors (sex, pack size) and the north-south gradient for seroprevalence suggests low probability of wolf-to-wolf  ...  Conclusions: We consider sarcoptic mange to have little effect on the recovery of the Scandinavian wolf population.  ...  Strømseth and pilot Ulf Grinde, who captured and handled the wolves, together with Jon M.  ... 
doi:10.1186/s12917-016-0780-y pmid:27459965 pmcid:PMC4962404 fatcat:6ssreeinqvhclmwhcp5vi3ihly

Wolves, people, and brown bears influence the expansion of the recolonizing wolf population in Scandinavia

Andrés Ordiz, Cyril Milleret, Jonas Kindberg, Johan Månsson, Petter Wabakken, Jon E. Swenson, Håkan Sand
2015 Ecosphere  
Wolf pair establishment was positively related to previous wolf presence and was negatively related to road density, distance to other wolf territories, and bear density.  ...  We took into account wolf-, habitat-, human-and brown bear (Ursus arctos)-related factors, because wolf expansion occurred within an area partially sympatric with bears.  ...  The Scandinavian wolf and bear projects (SKANDULV and SBBRP, respectively) have been funded by the Norwegian Environment Agency, the Swedish Environmental Protection Agency, the Norwegian Research Council  ... 
doi:10.1890/es15-00243.1 fatcat:tvfqqmmryrhphpsdhq3wxexhgm

First-Year German

Jon E. Zimmermann, Robert E. Helbling, Wolf Gewehr, Dieter Jedan, Wolff A. von Schmidt
1983 Die Unterrichtspraxis/Teaching German  
.; Wolf Gewehr; Dieter Jedan; and Wolff A. von Schmidt. First-Year German. 2nd ed. New York: Holt, Rinehart and Winston, 1979. 443 pp. $15.95.  ... 
doi:10.2307/3530615 fatcat:j473wimpvzfhvn3vznuikyhqpq

Editorial: Sulfation Pathways—There and Back Again

Jon Wolf Mueller, Abby C. Collier, Tarsis F. Gesteira
2022 Frontiers in Molecular Biosciences  
Sulfation Pathways are understood as the oxidative branch of sulfur metabolism (Günal et al., 2019) . Core to sulfation pathways is sulfate activation, the transfer of sulfate to biological acceptor molecules and its dynamic cleavage in a spatially and temporally specific manner. The biochemical problem of sulfate activation is evident even in geological specimens-gypsum may be observed in orthopedic casts, an example of the highly inert sulfate ion (Figure 1 ). A significant amount of energy
more » ... needed to turn biological sulfate into PAPS (3′-phosphoadenosine-5′-phospho-sulfate), the active sulfate form. The many and diverse sulfation acceptor molecules in biology dictate the molecular functions of ubiquitous sulfation pathways. Recent publications have highlighted doubly sulfated steroids (Lightning et al., 2021) as well as sulfo-conjugated vitamin D species (Jenkinson et al., 2022) . This Research Topic focused on Advances in Sulfation Pathways Research features nine research articles and three reviews, authored by 63 individual scientists, significantly advancing the field of Sulfation Pathways, highlighted within the following paragraphs: Research into sulfation pathways always relied on state-of-the-art analytical methods. Hence, we are pleased to present novel mass-spectrometry-based ways of profiling sulfated metabolites in urine by Fitzgerald et al. Developing mass spectrometry methods is impossible however without having the respective pure compounds readily at hand. In this regard, Alshehri et al. report a novel sulfation strategy to prepare steroid sulfates and isotopically labeled variations thereof, certainly an innovation with great importance for the field. Whenever coming from a genomic viewpoint, it may be necessary to characterize a sulfation enzyme with regards to its activity. With this in mind, Sun et al. have prepared a manuscript on optimized sulfotransferase assays. Sulfation impacts greatly on steroidogenesis-sulfated steroids may represent transport forms and/or modulate downstream processing (Foster and Mueller, 2018) . Two studies by Pavlič et al. and De Almeida Da Costa et al. independently provide experimental evidence that endometrial tissues can generate estrogens from circulating steroid sulfates. Sulfation of steroids predominantly occurs within the cytosol and sulfated steroids then need dedicated transporters to enter circulation and for the uptake into target tissues. Karakus et al. provide an in-depth study about the steroid sulfate uptake transporter SOAT (SLC10A6) in adipose tissue that illustrates this well. When studying sulfated steroids, not only are circulating steroids important, but also sulfated neuro-steroids. This Research Topic features two review articles about steroid sulfation in neurodegenerative diseases by Vitku et al. and during neurodevelopment by Clarke et al. Fascinating topics that will enable exciting discoveries in future, with great potential for the development of novel therapeutics.
doi:10.3389/fmolb.2022.912700 fatcat:cgmrffsmr5dp3nb3obaadnvpve

Steroid sulfation research has come a long way

Jon Wolf Mueller, Paul A Foster
2018 Journal of Molecular Endocrinology  
doi:10.1530/jme-18-0109 pmid:30030389 fatcat:aztqlx423femlghxfxu2fps6iy
« Previous Showing results 1 — 15 out of 12,257 results