Although inhibition has often been proposed as a central mechanism for coordinating activity in the olfactory system, relatively little is known about how activation of different inhibitory local circuit pathways can generate coincident inhibition of principal cells. We used serotonin (5-HT) as a pharmacological tool to induce spiking in ensembles of mitral cells (MCs), a primary output neuron ...

The linearity of the synaptic summation of two unitary excitatory synaptic events was investigated during whole cell recordings from retinal target neurons in an eye-attached isolated brain stem preparation. Pairs of unitary excitatory postsynaptic potentials (EPSPs) were evoked by bipolar stimulation electrodes that were directed to two distinct foci on the retinal surface based on the visual ...

The appearance in string theory of higher-dimensional objects known as Dbranes has been a source of much of the interesting developements in the subject during the past ten years. A very interesting phenomenon occurs when several of these D-branes are made to coincide: The abelian gauge theory living on each brane is enhanced to a non-abelian gauge theory living on the stack of coincident brane...

How do neurons compute? Two main theories compete: neurons could temporally integrate noisy inputs (rate-based theories) or they could detect coincident input spikes (spike timing-based theories). Correlations at fine timescales have been observed in many areas of the nervous system, but they might have a minor impact. To address this issue, we used a probabilistic approach to quantify the impa...

We consider properties of a covariant worldvolume action for a system of N coincident Dp– branes in D=(p+2) dimensional space–time (so called codimension one branes). In the case of N coincident D0–branes in D=2 we then find a generalization of this action to a model which includes fermionic degrees of freedom and is invariant under target–space supersymmetry and worldline kappa–symmetry. We fi...

Four cases of streptomycin stomatiti are presented together with three cases of eczematous dermatitis of the hands and feet coincident with streptomycin therapy, and attention is called to association of stomatitis with a vulvar mycotic lesion in one instzmce and Concomitant stomatitis with severe trichophytoid lesions of hands and feet in another. While the over-all series of treatment with st...

Extensive studies of Boolean functions are carried in many fields. The Mobius transform is often involved for these studies. In particular, it plays a central role in coincident functions, the class of Boolean functions invariant by this transformation. This class – which has been recently introduced – has interesting properties, in particular if we want to control both the Hamming weight and t...

During mitosis, gene conversion events at the TRP5 locus on chromosome VII are coupled with conversion events at LEU1, a locus 18 cM away, 1200 times more frequently than would be expected for two independent acts of recombination. Such coincident conversion events that occur over relatively long distances could be due to several mechanisms. We discuss these possibilities and describe an experi...

The rationalizability of a choice function by means of a transitive relation has been analyzed thoroughly in the literature. However, not much seems to be known when transitivity is weakened to quasi-transitivity or acyclicity. We describe the logical relationships between the different notions of rationalizability involving, for example, the transitivity, quasi-transitivity, or acyclicity of t...

In this article the notion of quasi right factorization structure in a category X is given. The main result is a one to one correspondence between certain classes of quasi right factorization structures and 2-reflective subobjects of a predefined object in Lax(PrOrdX op ). Also a characterization of quasi right factorization structures in terms of images is given. As an application, the closure...