Alyosha C. Molnar

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Our goal was to understand how patterns of excitation and inhibition, interacting across arrays of ganglion cells in space and time, generate the spiking output pattern for each ganglion cell type. We presented the retina with a 1-s flashed square, 600 microm on a side, and measured patterns of excitation and inhibition over an 1,800-microm-wide region(More)
A software-defined radio (SDR) ideally allows all of the parameters of the radio to be programmed dynamically. SDRs so far have shown flexibility in bandwidth (BW) [1], local oscillator (LO) frequency [2-4], gain, and modulation type. However, the impedance an RF front-end presents to its antenna has proven difficult to tune [5]. Since antenna impedance can(More)
Retinal bipolar cells can be divided into on and off types based on the polarity of their response to light. Bipolar activity is further shaped by inhibitory inputs, characterized here by the events that occur immediately after the onset of a light step: 1) in most off bipolar cells, excitatory current decreased, whereas inhibitory current increased. These(More)
In the mammalian retina, complementary ON and OFF visual streams are formed at the bipolar cell dendrites, then carried to amacrine and ganglion cells via nonlinear excitatory synapses from bipolar cells. Bipolar, amacrine and ganglion cells also receive a nonlinear inhibitory input from amacrine cells. The most common form of such inhibition crosses over(More)
We introduce a fast method, the &#x201C;in-crowd&#x201D; algorithm, for finding the exact solution to basis pursuit denoising problems. The in-crowd algorithm discovers a sequence of subspaces guaranteed to arrive at the support set of the final solution of <i>l</i><sub>1</sub> -regularized least squares problems. We provide theorems showing that the(More)
We studied the interactions between excitation and inhibition in morphologically identified amacrine cells in the light-adapted rabbit retinal slice under patch clamp. The majority of on amacrine cells received glycinergic off inhibition. About half of the off amacrine cells received glycinergic on inhibition. Neither class received any GABAergic(More)
We present a widely tunable passive mixer first duplexing transceiver which employs baseband noise-canceling, duplexing LNAs. The LNAs buffer transmitted signals to the mixer while canceling those signals in receive path. The transmitted signals are up-converted by the same mixer used for receiver down-conversion. The transceiver operates over a frequency(More)
The authors observed an acute desert-related disease when the mixture of the fine Saudi sand dust and pigeon droppings triggered a hyperergic lung condition. It was further aggravated by various kinds of organic pathogenic components contributing to an opportunistic infection of the lung. These all lead to the recognition of a new clinicopathological(More)