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We develop and test four alternative logics of attachment accumulative advantage, homophily, follow-the-trend, and multiconnectivity to account for both the structure and dynamics of interorganizational collaboration in the field of biotechnology. The commercial field of the life sciences is typified by wide dispersion in the sources of basic knowledge and(More)
This paper presents recent advances in the statistical modeling of random graphs that have an impact on the empirical study of social networks. Statistical exponential family models (Wasserman and Pattison 1996) are a generalization of the Markov random graph models introduced by Frank and Strauss (1986), which in turn are derived from developments in(More)
We develop and test four alternative logics of attachment accumulative advantage, homophily, follow-the-trend, and multiconnectivity to account for both the structure and dynamics of interorganizational collaboration in the field of biotechnology. The commercial field of the life sciences is typified by wide dispersion in the sources of basic knowledge and(More)
Emergent economies often suffer from insufficient public institutions to enforce contract commitments and property rights. Informal reputation-based arrangements offer an alternative but they require both wide-spanning and closely knit networks that permit exchange partners to learn about each other's past behavior and enable collective sanctioning. The(More)
For the past few decades, researchers have devoted time and effort to apply automation and modern computer technologies towards improving the productivity of traditional industries. To be competitive, one must streamline operations and minimize production costs, while maintaining an acceptable margin of profit. This paper describes the effort of one such(More)
Epidemiological studies have demonstrated that dietary modifications can reduce the incidence of cancer. Specifically, diets high in vegetables and fruits are associated with lower rates of cancer at many sites. Somatic mutations have a critical role in carcinogenesis suggesting the use of in vivo mutation assays as an alternative approach to studying the(More)
Spontaneous genetic damage, whether mutations or chromosomal aberrations, undoubtedly arise from a variety of sources including replication errors, oxidative damage, background radiation, and chemical exposure. Given the numerous correlations between diet and cancer, it seemed possible that diet could influence the spontaneous rate of DNA damage and its(More)
RDS is an increasingly popular chain-referral sampling method used to recruit samples of hidden and hard-to-reach populations. It seeks to provide a probability-based inferential structure for representations of population groups with status characteristics that are not likely to be revealed by omnibus survey research because they are rare and socially(More)
One of the most worrisome possibilities in the field of antimutagenesis and anticarcinogenesis is that factors that protect against one mutagen or carcinogen will not be effective against another. Indeed, such specificities are known. Consequently, protective agents found in experimental screens and systems may not be relevant to the human situation.(More)