The monosynaptic targets of different functional types of geniculocortical axons were compared in the primary visual cortex of monkeys. Single thalamocortical axons were recorded extracellularly in the white matter by using horseradish-peroxidase-filled pipettes. Their receptive fields were mapped and classified as corresponding to those of parvi- or magnocellular neurons in the lateral genicul...

A dinucleoside monophosphate was isolated from 5-bromouracil-induced filaments of a thymine auxotroph of Escherichia coli K-12. The dinucleoside monophosphate was fractioned from a ["C]5-bromouracil-labeled perchloric acid extract using Dowex-1-formate ion-exchange chromatography. Sephadex chromatography revealed its molecular weight to be 710. Snake venom phosphodiesterase digest of the dinucl...

Fig. 3. Inhibition of binding of ['4C]pentobarbital to rabbit antiserum by nonradioactive pentobarbital in buffered saline (0 0 *), plasma (0 O), or urine (X X). Incubation medium consisted of 0.10 ml of normal rabbit serum, 0.10 nml of rabbit antiserum (0.4 mg of protein), 0.01 ml of ['4C]pentobarbital (O.1 nmole), and 0.01 ml of either standard unlabeled pentobarbital (1 to 100 ng) or unknown...

Let G be a K4-free graph, an edge in its complement is a K4-saturating edge if the addition of this edge to G creates a copy of K4. Erdős and Tuza conjectured that for any n-vertex K4-free graph G with bn2/4c + 1 edges, one can find at least (1 + o(1)) 2 16 K4-saturating edges. We construct a graph with only 2n2 33 K4-saturating edges. Furthermore, we prove that it is best possible, i.e., one c...

Fig. 3. Inhibition of binding of ['4C]pentobarbital to rabbit antiserum by nonradioactive pentobarbital in buffered saline (0 0 *), plasma (0 O), or urine (X X). Incubation medium consisted of 0.10 ml of normal rabbit serum, 0.10 nml of rabbit antiserum (0.4 mg of protein), 0.01 ml of ['4C]pentobarbital (O.1 nmole), and 0.01 ml of either standard unlabeled pentobarbital (1 to 100 ng) or unknown...

We present the first optical observations of the radio source 4C +08.45. It is identified with an elliptical galaxy (R = 15.92) at redshift z= 0.1250, with a comparable companion galaxy (R = 15.36; z= 0.1257) at a projected distance of 34.8 kpc. Both galaxies are normal elliptical galaxies. The galaxy identified with the radio source shows strong emission lines on top of an elliptical galaxy sp...