“Levels of analysis” has been a controversial topic in group research and has often been ignored by IS researchers leading to “cross-level fallacies” and “aggregation biases.” While the predominant practice in IS research is to assess group behavior by computing the “arithmetic mean of individual members’ behaviors,” recent studies have argued that groups should be treated separate from the ind...

An important criterium for social choice methods is their resistance against various types of strategic behavior. Seminal results in the social choice literature indicate that absolute resistance is in many cases impossible. For this reason, it has often been argued that computational intractability could be used as an obstruction for strategic behavior for different procedures. In this paper, ...

We investigate the behavior of a single-cell protozoan in a narrow tubular ring. This environment forces them to swim under a one-dimensional periodic boundary condition. Above a critical density, single-cell protozoa aggregate spontaneously without external stimulation. The high-density zone of swimming cells exhibits a characteristic collective dynamics including translation and boundary fluc...

A series of novel 2-aminopyrimidine and 2-Substituted-4,6-diaminopyrimidine derivatives have been synthesized and their anti platelet aggregation activities were assessed against ADP and arachidonic acid- induced platelet aggregation in human plasma using light transmission aggregometry. None of the compounds showed satisfactory activity against the aggregation induced by ADP. However, satisfac...

In response to adverse conditions, myxobacteria form aggregates that develop into fruiting bodies. We model myxobacteria aggregation with a lattice cell model based entirely on short-range (nonchemotactic) cell-cell interactions. Local rules result in a two-stage process of aggregation mediated by transient streams. Aggregates resemble those observed in experiment and are stable against even ve...

The classical aggregation result by Tiao (1972, Asymptotic Behavior of Temporal Aggregates of Time Series, Biometrika 59, 525-531) is generalized for a weak set of assumptions. The innovations driving the integrated processes are only required to be stationary with integrable spectral density. The derivation is settled in the frequency domain. In case of fractional integration it is demonstrate...

The aggregation of insulin is complicated by the coexistence of various multimers, especially in the presence of Zn(2+). Most investigations of insulin multimerization tend to overlook aggregation kinetics, while studies of insulin aggregation generally pay little attention to multimerization. A clear understanding of the starting multimer state of insulin is necessary for the elucidation of it...

In article number 2007180, Tae Kyu Ahn, Sanghyuk Park, Hui Joon and co-workers investigate the synergistic effect of excited state property aggregation behavior organic semiconductors, enhancing hole-transportation in perovskite devices.

The price elasticity of gasoline demand is a key parameter in evaluation various policies. However, most the literature uses aggregate data to identify this elasticity. Temporal and spatial aggregation make such estimates biased. We employ unique dataset all transactions Iran during 4-month period around an unexpected exogenous change that also significant withholding behavior by consumers resp...

An important natural phenomenon surfaces that satisfactory synchronization of self-driven particles can be achieved via remarkably reduced communication cost, especially for high density particle groups with low external noise. Statistical numerical evidence illustrates that a highly efficient manner is to distribute the communication messages as evenly as possible along the whole dynamic proce...