Organic Superconductors: when correlations and magnetism walk in

This survey provides a brief account for the start of organic superconductivity motivated by the quest for high Tc superconductors and its development since the eighties'. Besides superconductivity found in 1D organics in 1980, progresses in this field of research have contributed to better understand the physics of low dimensional conductors highlighted by the wealth of new remarkable properties. Correlations conspire to govern the low temperature properties of the metallic phase. The contribution of antiferromagnetic fluctuations to the interchain Cooper pairing proposed by the theory is borne out by experimental investigations and supports supercondutivity emerging from a non Fermi liquid background. Quasi one dimensional organic superconductors can therefore be considered as simple prototype systems for the more complex high Tc materials.Comment: 41 pages, 21 figures to be published in Journal of Superconductivity and Novel Magnetis

A Review of Strategic Process Research

This article reviews research on the process of strategic management reported over the last six years in seven leading journals. Nine "streams" of work are identified and critiqued. The field is described as giving continuing attention to the possibilities and problems of strategic planning and decision making, but also moving into new areas of research - especially the problem of how the attention of decision makers is directed toward specific agendas for action. We recommend more studies that simultaneously consider strategy formulation and implementation and more studies that attempt to integrate methods and concerns across the various areas of process research. Finally, we recommend that future research give simultaneous attention to the content as well as the process of strategy

Taxonomia e variação geográfica das espécies do gênero Alouatta Lacépède (Primates, Atelidae) no Brasil Taxonomy and geographic variation of species of the genus Alouatta Lacépède (Primates, Atelidae) in Brazil

Neste estudo analisou-se a variação geográfica e não-geográfica de táxons de bugios, gênero Alouatta Lacépède, 1799, que ocorrem no Brasil, com o objetivo de esclarecer a taxonomia do grupo. Para a análise morfológica, examinou-se um total de 1.286 espécimes mantidos em cinco museus brasileiros e dois norte-americanos. O material consistiu basicamente de peles, crânios e ossos hióides; esqueletos e espécimes preservados em via úmida foram escassos. O estudo se baseou na análise qualitativa dos complexos morfológicos em adição a 18 morfométicos do crânio e osso hióide. Antes das decisões taxonômicas, elaborou-se um estudo de variação geográfica, sexual, ontogenética e individual. Reconheceu-se 10 espécies de Alouatta ocorrendo no Brasil, sendo a maioria definida por caracteres discretos, porém diagnósticos. São elas: Alouatta caraya (Humboldt, 1812), A. fusca (Geoffroy Saint-Hilaire, 1812), A. clamitans Cabrera, 1940, A. belzebul (Linnaeus, 1766), A. discolor (Spix, 1823), A. ululata Elliot, 1912; A. juara (Linnaeus, 1766), A. macconnelli (Humboldt, 1812), A. puruensis Lönnberg, 1941 e A. nigerrima Lönnberg, 1941. Alouatta macconnelli e A. clamitans mostraram notável variação geográfica na coloração da pelagem e algumas variáveis morfométricas (polimorfismo) o que dificultou as definições e limites dos táxons. Alouatta belzebul apresentou variação em mosaico na coloração da pelagem. Alouatta ululata e A. puruensis foram definidas pela presença de dicromatismo sexual na pelagem, mas este caráter pode ser um artefato e necessita estudos adicionais para corroborar sua validade. Sinonimizou-se Alouatta belzebul mexianae Hagmann, 1908 com A. discolor; e a validade de Alouatta seniculus amazonica Lönnberg 1941, não foi considerada.<br>In this monograph, was studied non-geographic and geographic variation of taxa of Howling Monkeys, genus Alouatta Lacépède, 1799, occuring in Brazil, in order to solve the taxonomy of the group. For the morphological analysis, were examined a total of 1,286 specimens kept in five Brazilian and two North-American museums. The material consisted mostly of skin, skull and hyoid bone; skeleton or fluid-preserved specimens were scarse. The study was based on qualitative analysis of the morphological complexes in addition 18 morphometric characters of the skull and hyoid bone. Prior to making taxonomic decisions, was conducted a study of geographic, sexual, ontogenetic, and individual variation. Were recognized ten species of Alouatta occuring in Brazil and most of them were defined by discrete, but diagnostic characters. The species are: Alouatta caraya (Humboldt, 1812), A. fusca (Geoffroy Saint-Hilaire, 1812), A. clamitans Cabrera, 1940, A. belzebul (Linnaeus, 1766), A. discolor (Spix, 1823), A. ululata Elliot, 1912; A. juara (Linnaeus, 1766), A. macconnelli (Humboldt, 1812), A. puruensis Lönnberg, 1941, and A. nigerrima Lönnberg, 1941. Alouatta macconnelli and A. clamitans showed noticeable geographic variation on pelage coloration and some morphometric characters (polymorphism) difficulting their definition and geographic limits. Alouatta belzebul presented an accentuated geographic mosaic variation on coat coloration. Alouatta ululata and A. puruensis were defined in presenting sexual dicromism on pelage, but this character can be an artefate due the small sample and both taxa need further studies to confirm their validity. Alouatta belzebul mexianae Hagmann, 1908 was sinonimized with A. discolor; and the validity of Alouatta seniculus amazonica Lönnberg 1941 was not considered