منابع مشابه
An Enzymatic Palimpsest
According to the Compact Oxford English Dictionary, a palimpsest is “a parchment or other surface on which writing has been applied over earlier writing which has been erased.” Scholars are often able to decipher the earlier writing present on palimpsests by using chemical and imaging techniques. In a new study of a key enzyme that’s involved in the biosynthesis of the guanine nucleotides, inos...
متن کاملA palimpsest memory based on an incremental Bayesian learning rule
Capacity limited memory systems need to gradually forget old information in order to avoid catastrophic forgetting where all stored information is lost. This can be achieved by allowing new information to overwrite old, as in the so-called palimpsest memory. This paper describes a new such learning rule employed in an attractor neural network. The network does not exhibit catastrophic forgettin...
متن کاملThe medical palimpsest of The Scarlet Letter: an interdisciplinary reading.
The multiple historical layers of Roger Chillingworth's character have been overlooked in criticism of The Scarlet Letter. By considering the possible influence of Robert Browning's dramatic poem Paracelsus (1835) on Hawthorne's romance (1850), as well as the ways in which overtones of both herbalism and clinical medicine complicate Chillingworth's character, one rediscovers Chillingworth as Ha...
متن کاملImmune Cell Identity: Perspective from a Palimpsest.
The immune system in mammals is composed of multiple different immune cell types that migrate through the body and are made continuously throughout life. Lymphocytes and myeloid cells interact with each other and depend upon each other, but each are highly diverse and specialized for different roles. Lymphocytes uniquely require developmentally programmed mutational changes in the genome itself...
متن کاملAn enzymatic and bioinformatics study of native cutinase bacteria
Cutin is a polymer that is constructed in plants by the condensation and oxidation of fatty acids and plays a key role in the protection of plants against pathogens. Cutinase is a hydrolase enzyme that breaks down the cutin. The purpose of this study was to extract cutin from red apples with oxalate buffer, cutinase enzyme activity assay in LB culture, and bioinformatic analysis. To attain thes...
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ژورنال
عنوان ژورنال: PLoS Biology
سال: 2008
ISSN: 1545-7885
DOI: 10.1371/journal.pbio.0060217