SciELO - Scientific Electronic Library Online
(52,285 recursos)
SciELO (Scientific Electronic Library Online) is an electronic library covering a selected collection of Brazilian scientific journals. The objective of the site is to implement an electronic virtual library, providing full access to a collection of serial titles, a collection of issues from individual serial titles, as well as to the full text of articles. The project envisages the development of a common methodology for the preparation, storage, dissemination and evaluation of scientific literature in electronic format.
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L'unification des forces en physique: les premières tentatives - LOPES,JOSÉ LEITE
The author gives a brief description of the studies that led to the eclosion of the weak forces model of unification of Electromagnetic interactions with weak interactions.
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Surface charges and interfaces: implications for mineral roles in prebiotic chemistry - PONTES-BUARQUE,MILA; TESSIS,ANA C.; BONAPACE,JOSÉ A. P.; MONTE,MARISA B. M.; SOUZA-BARROS,FERNANDO DE; VIEYRA,ADALBERTO
The properties of pyrite surface net charge and of its interface with a solution simulating primitive seawater are discussed and their implications to the autocatalytic model (Wächtershäuser 1988a 1992) are presented in order to demonstrate their relevance.
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Short- and long-term memory: differential involvement of neurotransmitter systems and signal transduction cascades - VIANNA,MÔNICA R.M.; IZQUIERDO,LUCIANA A.; BARROS,DANIELA M.; WALZ,ROGER; MEDINA,JORGE H.; IZQUIERDO,IVÁN
Since William James (1890) first distinguished primary from secondary memory, equivalent to short- and long-term memory, respectively, it has been assumed that short-term memory processes are in charge of cognition while long-term memory is being consolidated.
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Energy interconversion by the sarcoplasmic reticulum Ca2+-ATPase: ATP hydrolysis, Ca2+ transport, ATP synthesis and heat production - MEIS,LEOPOLDO DE
A part of the chemical energy released during ATP hydrolysis is converted into heat and in the bibliography it is assumed that the amount of heat produced during the hydrolysis of an ATP molecule is always the same, as if the energy released during ATP cleavage were divided in two non-interchangeable parts: one would be converted into heat, and the other used for Ca2+ transport.
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Genetic modification of mammalian genome at chromosome level - SEROV,OLEG L.; MATVEEVA,NATALIA M.; SEROVA,IRINA A.; BORODIN,PAVEL M.
The review is concerned with a progress in genetic modification of a mammalian genome in vitro and in vivo at chromosomal level.
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