A supposed heterodontosaurid tooth from the Rhaetian of Switzerland and a reassessment of the European Late Triassic record of Ornithischia (Dinosauria)

Verifiable remains of ornithischian dinosaurs are scarce in Upper Triassic\ud sediments. An isolated tooth from the Rhaetic bone bed of Hallau, Switzerland,\ud has previously been referred to the ornithischian clade Heterodontosauridae. We\ud redescribe this tooth, demonstrating that it cannot be assigned to Ornithischia but\ud does resemble enigmatic teeth from the Owl Rock Formation ofNorth America and\ud may represent a new taxon or clade of archosauriform reptiles. The identification\ud of all other Late Triassic teeth from Europe previously assigned to Ornithischia is\ud problematic, and we here regard these specimens as pertaining to Archosauriformes\ud indet. Bone fragments from the Westbury Formation of England have been assigned\ud to the ornithischian clade Stegosauria, but cannot be referred with certainty to\ud any reptilian clade. There is no persuasive body fossil evidence for ornithischian\ud dinosaurs in the Late Triassic of Europe; ornithischians may have been limited in\ud diversity, abundance and geographical distribution during this time period, radiating\ud only after the end ofthe Triassic

Casos de implantação da QS 9000 em empresas no Brasil

Devido as limitações da série ISO 9000, segmentos industriais específicos vêm desenvolvendo requisitos normativos específicos para seus fornecedores, com destaque para a cadeia de fornecimento do setor automotivo. Uma dessas iniciativas é o lançamento, em 1994, da QS 9000, que reúne requisitos normativos de fornecedores da Ford, Chrysler e General Motors em todo o mundo. Esse trabalho apresenta os resultados da implantação da QS 9000 em uma empresa fabricante de freios automotivos, além de descrever seu desenvolvimento e conteúdo e destacar outros resultados de implantação extraídos da literatura.<br>Due to the limitations of ISO 9000 series, some industrial sectors have developed quality standards requirements specifically to their suppliers. One of these sectors is the automotive. Among these initiatives there is the launching of QS 9000 in 1994, which congregates standard requirements for the suppliers of Ford, Chrysler e General Motors all over the world. This paper presents the results of QS 9000 implementation in a company, which produces brake systems. It also describes the development of QS 9000 and highlights other cases of implementation from the literature

A hypothesis: autonomic rhythms are reflected in growth lines of teeth in humans and extinct archosaurs

A major determinant of tooth architecture is the arrangement of lines in dentin and in the enamel following the contour of the surface. Since the original description of these lines in the 19th century, they have been attributed to recurring events during tooth development. They have also attracted the attention of dental scientists and anthropologists; however, to date, studies of these structures have been largely theoretical and microscopic. We show here that the statistical properties of the spacing between the lines are similar in teeth from both ancient and modem humans and from extinct archosaurs, reptiles that lived tens or hundreds of millions of years ago-they also resemble heart rate variability of living humans. We propose that the deposition of these recurring structures is controlled by the autonomic nervous system. This control accounts for their regularity and recurrent nature and implies that the lines are an expression of a biologic rhythm which has been conserved throughout evolution. Details of the rhythms give clues to life styles in ancient civilizations and to the physiology of extinct archosaurs. (C) 2004 Published by Elsevier B.V

A hypothesis: autonomic rhythms are reflected in growth lines of teeth in humans and extinct archosaurs

A major determinant of tooth architecture is the arrangement of lines in dentin and in the enamel following the contour of the surface. Since the original description of these lines in the 19th century, they have been attributed to recurring events during tooth development. They have also attracted the attention of dental scientists and anthropologists; however, to date, studies of these structures have been largely theoretical and microscopic. We show here that the statistical properties of the spacing between the lines are similar in teeth from both ancient and modem humans and from extinct archosaurs, reptiles that lived tens or hundreds of millions of years ago-they also resemble heart rate variability of living humans. We propose that the deposition of these recurring structures is controlled by the autonomic nervous system. This control accounts for their regularity and recurrent nature and implies that the lines are an expression of a biologic rhythm which has been conserved throughout evolution. Details of the rhythms give clues to life styles in ancient civilizations and to the physiology of extinct archosaurs. (C) 2004 Published by Elsevier B.V