1Department of Medical Chemistry, Medical University of Lublin, Chodzki 4a, 20-093 Lublin, Poland 2Environmental Studies Department, Institute of Graduate Studies and Research, University of Alexandria, 163 Horrya Av., P.O. Box 832, El Shatby, Alexandria, Egypt 3Department of Biomedical and Specialist Surgical Sciences, Section of Neurological, Psychiatric and Psychological Sciences, University...

‎‎we exhibit an explicit construction for the second cohomology group‎ ‎$h^2(l‎, ‎a)$ for a lie ring $l$ and a trivial $l$-module $a$‎. ‎we show how the elements of $h^2(l‎, ‎a)$ correspond one-to-one to the‎ ‎equivalence classes of central extensions of $l$ by $a$‎, ‎where $a$‎ ‎now is considered as an abelian lie ring‎. ‎for a finite lie‎ ‎ring $l$ we also show that $h^2(l‎, ‎c^*) cong m(l)$‎...

On Consonants, Vowels, Chickens, and Eggs Luca L. Bonatti, Marcela Peña, Marina Nespor, and Jacques Mehler International School for Advanced Studies, Trieste, Italy; Université de Nantes, Nantes Atlantique Universités, Labécd (EA 3259), Nantes, France; Laboratorio de Neurociencias, Escuela de Psicologı́a, Pontificia Universidad Católica de Chile, Macul, Chile; University of Ferrara, Ferrara, Ita...

we introduce the notion ofstrongly $alpha$-reversible rings which is a strong version of$alpha$-reversible rings, and investigate its properties. we firstgive an example to show that strongly reversible rings need not bestrongly $alpha$-reversible. we next argue about the strong$alpha$-reversibility of some kinds of extensions. a number ofproperties of this version are established. it is shown ...

in this paper, we introduce a class of rings which is a generalization of reversible rings. let r be a ring with identity. a ring r is called central reversible if for any a,b ∈ r, ab=0 implies ba belongs to the center of r. since every reversible ring is central reversible, we study sufficient conditions for central reversible rings to be reversible. we prove that some results of reversible ri...

in this paper we focus on a special class of commutative local‎ ‎rings called spap-rings and study the relationship between this‎ ‎class and other classes of rings‎. ‎we characterize the structure of‎ ‎modules and especially‎, ‎the prime submodules of free modules over‎ ‎an spap-ring and derive some basic properties‎. ‎then we answer the‎ ‎question of lam and reyes about strongly oka ideals fam...

University of Michigan, Ann Arbor, MI 48109, USA Los Alamos National Laboratory, Los Alamos, NM 87545, USA NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA Universities Space Research Association, Seabrook, MD 20706, USA Raytheon Systems, Lanham, MD 20706, USA Università degli Studi di Ferrara, Ferrara, Italy Space Research Organization, Utrecht, The Netherlands Space Sciences Laborat...

1Munich Leukemia Laboratory GmbH, Munich, Germany; 2Institute of Hematology, University of Perugia, Perugia, Italy; 3Department of Cellular Biotechnologies and Hematology, “La Sapienza” University, Rome, Italy; 4Department of Biomedical Sciences and Advanced Therapies, University of Ferrara, Ferrara, Italy; 5Institute of Hematology “Ludovico & Ariosto Seragnoli,” University of Bologna, Bologna,...

Angelo Corsico,1 Manlio Milanese,2 Simonetta Baraldo,3 Gian Luca Casoni,4 Alberto Papi,4 Anna Maria Riccio,2 Isa Cerveri,1 Marina Saetta,3 and Vito Brusasco2 2Dipartimento di Medicina Interna, Università di Genova, 16132 Genova; 1Clinica di Malattie dell’Apparato Respiratorio, IRCCS Policlinico S. Matteo, Università di Pavia, 27100 Pavia; 3Dipartimento di Medicina Clinica e Sperimentale, Sezion...