4,393 research outputs found
Algebraic families of subfields in division rings
We describe relations between maximal subfields in a division ring and in its
rational extensions. More precisely, we prove that properties such as being
Galois or purely inseparable over the centre generically carry over from one to
another. We provide an application to enveloping skewfields in positive
characteristics. Namely, there always exist two maximal subfields of the
enveloping skewfield of a solvable Lie algebra, such that one is Galois and the
second purely inseparable of exponent 1 over the centre. This extends results
of Schue in the restricted case. Along the way we provide a description of the
enveloping algebra of the p-envelope of a Lie algebra as a polynomial extension
of the smaller enveloping algebra.Comment: 9 pages, revised according to referee comments, new titl
Structure of the saxiphilin:saxitoxin (STX) complex reveals a convergent molecular recognition strategy for paralytic toxins.
Dinoflagelates and cyanobacteria produce saxitoxin (STX), a lethal bis-guanidinium neurotoxin causing paralytic shellfish poisoning. A number of metazoans have soluble STX-binding proteins that may prevent STX intoxication. However, their STX molecular recognition mechanisms remain unknown. Here, we present structures of saxiphilin (Sxph), a bullfrog high-affinity STX-binding protein, alone and bound to STX. The structures reveal a novel high-affinity STX-binding site built from a "proto-pocket" on a transferrin scaffold that also bears thyroglobulin domain protease inhibitor repeats. Comparison of Sxph and voltage-gated sodium channel STX-binding sites reveals a convergent toxin recognition strategy comprising a largely rigid binding site where acidic side chains and a cation-Ď€ interaction engage STX. These studies reveal molecular rules for STX recognition, outline how a toxin-binding site can be built on a naĂŻve scaffold, and open a path to developing protein sensors for environmental STX monitoring and new biologics for STX intoxication mitigation
36-39: Malos Tiempos ou comment la bande dessinée rend hommage aux vaincus de la Guerre civile
The Spanish comic book author Carlos Giménez signs between 2007 and 2009 a series of four albums on the Spanish Civil War titled 36-39: Malos tiempos. In this tetralogy, the denunciatory dimension is very strong and leads us to ask ourselves a certain number of questions: first, why now address the theme of the Civil War? What relationship to the memory of the author here, born in 1941 and did not live the conflict? What are the methods of writing these albums? Finally, what representation of war offer us? 36-39 turns out to be a special "narrative of memory", drawn by an author who wants to convey his vision of the Spanish war to the younger generations. So these four albums are endowed with a pedagogical and explanatory value, and almost educational: it is not so much for Carlos Giménez to tell History, than to draw lessons, via an original medium like the comic, a form of expression intended for the greater number, more likely than others to reach a young and wide audience
Preacher\u27s Magazine Volume 33 Number 03
Cover — Charles B. Jernigan The Preacher in Study and Pulpit, J. B. Chapman Editorial, IV. Problems Our Pastors Face Born for the Skies, Genevieve Thompson The Extreme of God’s Grace, L. B. Hicks I Prefer an Evangelist, Richard S. Taylor II. The Prophet or a Preacher, J. Melton Thomas The Preparation and Delivery of Sermons, C. E. Shumake Gleanings from the Greek New Testament, Ralph Earle Evangelism, V. H. Lewis Preachers and Promises, E. E. Shelhamer The Pastor and His People, Merilyn G. Feller The Midweek Prayer Meeting, Lowell W. Coey Advertising Through Journalism, Robert D. Rogers The Shadow of the Cross, A. F. Cone Sermon Workshop Book Briefshttps://digitalcommons.olivet.edu/cotn_pm/1366/thumbnail.jp
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