Distinct roles of GPVI and integrin alpha(2)beta(1) in platelet shape change and aggregation induced by different collagens

1 Various platelet membrane glycoproteins have been proposed as receptors for collagen, in some cases as receptors For specific collagen types. In this study we have compared the ability of a range of collagen types to activate platelets.

A puzzling periodicity in the pulsating DA white dwarf G 117-B15A

We present time-resolved optical spectrophotometry of the pulsating hydrogen atmosphere (DA) white dwarf G 117-B15A. We find three periodicities in the pulsation spectrum (215 s, 272 s, and 304 s) all of which have been found in earlier studies. By comparing the fractional wavelength dependence of the pulsation amplitudes ( chromatic amplitudes) with models, we confirm a previous report that the strongest mode, at 215 s, has l = 1. The chromatic amplitude for the 272 s mode is very puzzling, showing an increase in fractional amplitude with wavelength that cannot be reproduced by the models for any ` at optical wavelengths. Based on archival HST data, we show that while the behaviour of the 215 s mode at ultra-violet wavelengths is as expected from models, the weird behaviour of the 272 s periodicity is not restricted to optical wavelengths in that it fails to show the expected increase in fractional amplitude towards shorter wavelengths. We discuss possible causes for the discrepancies found for the 272 s variation, but find that all are lacking, and conclude that the nature of this periodicity remains unclear.

A resolução de problemas, o raciocínio e a comunicação matemática no 1º ciclo do ensino básico

A comunicação aborda o caso dum professor do 1.º ciclo do ensino básico (Francisco) inserido numa investigação mais ampla em que se pretendeu estudar as concepções e práticas dos professores do 1.º ciclo do ensino básico relativamente à resolução de problemas, raciocínio e comunicação matemática. O estudo segue uma metodologia de investigação de natureza interpretativa e abordagem qualitativa na modalidade de estudo de caso. Francisco apresenta algumas preocupações de carácter metodológico relativamente ao ensino e aprendizagem da Matemática defendendo a importância do papel do professor em assegurar o acompanhamento do trabalho dos alunos de forma a compreender o problema. As situações propostas pelo Francisco na sala de aula assumem características problemáticas embora revele sentir algumas dificuldades na sua exploração. Para o Francisco, raciocínio e técnicas, estão a par, não privilegia mais uma do que outra. Reconhece que não tem insistido para que os seus alunos falem e escrevam sobre Matemática embora se preocupe em desenvolver uma boa comunicação na sala de aula.

Jewish Identity in the Modern World: Its Nature and Dynamics, pt. 1

Discussion of the development of Jewish identity, considering the Enlightenment, Antisemitism, and Zionism.

Recent Archaeological Discoveries and Biblical Research, pt. 1

Discussion of how archaeology today can illuminate the world of the Bible, specifically the Israelite settlement in Canaan, and how it is possible to reconstruct the lost background of the Israelite cults.

Kiss of God: Spiritual Death in Jewish Religious History, pt. 1

Discussion of the spiritual face of Judaism in one of its many appearances. Fishbane explores the quest for spiritual perfection in early rabbinic sources and in Jewish philosophy and mysticism. The "kiss of God," a symbol for union with God, and the ritual practices - meditation and performance - connected with it are presented.

Pardes: The Quest for Spiritual Paradise in Judaism, pt. 1

Mysticism in Judaism

The Invention of Hebrew Prose: Literary Language and the Dilemmas of Mimesis, pt. 3, sect. 1

DIscussion of how the Hebrew literary language developed and how it is used to create a reality.

Gender and Assimilation: The Roles and Representation of Women in Modern Jewish History, pt. 1

Explores the relation between gender and the encounter of Jews with various conditions of Modernity. She makes clear that the study of the process of Jewish assimilation in contemporary times must include women and gender in its framework.