Brian Blais

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A series of recombinants between Rous-associated virus type 0 (RAV-0), RAV-1, and a replication-competent avian leukosis virus vector (RCAN) have been tested for disease potential in day-old inoculated K28 chicks. RAV-0 is a benign virus, whereas RAV-1 and RCAN induce lymphoma and a low incidence of a variety of other neoplasms. The results of the(More)
Recombinants of Rous-associated virus-0 and Br21 have been used to localize 5' viral sequences that affect the osteopetrotic potential of avian leukosis viruses. Rous-associated virus-0 is a benign subgroup E virus of endogenous origin that does not cause osteopetrosis. Br21 is a constructed subgroup E virus with high osteopetrotic potential. 5' sequences(More)
Simple cells found in primary visual cortex are orientation selective. It has been experimentally found that they acquire this property with time i.e. learning of orientation selectivity takes place. Many computational models have been proposed for the development of orientation selectivity. Most of the models proposed so far are either abstract in nature(More)
We measured bulk δC and δN values and carbon and nitrogen elemental concentrations of leaves collected from Metasequoia glyptostroboides Hu et Cheng trees cultivated at 39 sites across the United States under different latitudes and climatic regions. δD values from south-facing leaf n-alkanes of 27 trees were also determined. Climate data over the past 50(More)
We’d like to understand how the brain works but that is, at least immediately, an impossible task. In the standard physics fashion we introduce a simplified model of the smallest workable unit of the big problem and make that the system we’d like to understand, namely the neuron. It is a well established idea in neuroscience that signals between neurons is(More)
Visual cortical simple cells show a strong preference for edges of a particular orientation[Hubel and Wiesel, 1962]. The receptive field of the cortical cell shows adjacent excitatory and inhibitory subfields, which are projections from ON-center and OFF-center LGN cells, respectively[Reid and Alonso, 1995]. Here we present a single cell model using ON and(More)