With more than 700,000 genomes from 160 countries, GISAID is by far the world9s largest database of SARS-CoV-2 sequences. Access to free, nonprofit repository has become vital thousands scientists and public health agencies as they race track pandemic coronavirus9 alarmingly rapid evolution. But a dozen interviewed Science raised alarms about independent organization9s management. They reported...

when the parties to conclude a contract, bounding to performance their contractual obligations, but sometimes occur events that to make performance of obligations under a contract impossible or the circumstances of the time of performance of the contract substantially differentiate with the time of the time of the conclusion of the contract . these events are referred to as legal excuses, if th...

During extinction a previously learned behavior stops being reinforced. In addition to the decrease in the rate of the instrumental response, it produces an aversive emotional state known as frustration. This state can be assimilated with the fear reactions that occur after aversive stimuli are introduced at both the physiological and behavioral levels. This study evaluated frustration reaction...

Besides being a fascinating class of new materials, magnetic molecules provide the opportunity to study concepts of condensed matter physics in zero dimensions. This contribution will exemplify the impact of molecular magnetism on concepts of frustrated spin systems. We will discuss spin rings and the unexpected rules that govern their low-energy behavior. Rotational bands, which are experiment...

Regression has been defined here as a change which is opposite to development. Development includes some or all of the following changes (Chapter I, p. 14): increase in variety of behavior, increase in degree of hierarchical organizations, extension of area of activities and interests including time perspective, and increased weight of organizational dependence relative to simple dependence. Re...

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