Investigation of the effect of pressure on metallurgical phenomena Final report, 20 Jun. 1960 - 30 Sep. 1965

Pressure effect on lead-thallium, tin telluride, and lead tellurid

#Bigbirds never die: Understanding social dynamics of emergent hashtag

We examine the growth, survival, and context of 256 novel hashtags during the 2012 U.S. presidential debates. Our analysis reveals the trajectories of hashtag use fall into two distinct classes: “winners” that emerge more quickly and are sustained for longer periods of time than other “also-rans” hashtags. We propose a “conversational vibrancy” framework to capture dynamics of hashtags based on their topicality, interactivity, diversity, and prominence. Statistical analyses of the growth and persistence of hashtags reveal novel relationships between features of this framework and the relative success of hashtags. Specifically, retweets always contribute to faster hashtag adoption, replies extend the life of “winners” while having no effect on “also-rans.” This is the first study on the lifecycle of hashtag adoption and use in response to purely exogenous shocks. We draw on theories of uses and gratification, organizational ecology, and language evolution to discuss these findings and their implications for understanding social influence and collective action in social media more generally

Predicting carcinogenicity by using batteries of dependent short-term tests.

Among the various methods for predicting carcinogenicity from a battery of short-term tests (STTs), the carcinogenicity prediction and battery selection (CPBS) procedure is the most prominent. A major assumption of CPBS is that the STTs used in the prediction are conditionally independent. Results of recent National Toxicology Program studies of four commonly used in vitro STTs contradict this assumption, thereby necessitating modification of CPBS to accommodate dependencies. This is accomplished via log-linear modeling, which then also yields an important dividend: standard errors for the predicted probabilities of carcinogenicity

Improved plasmids for gene targeting at the his-3 locus of Neurospora crassa by electroporation: Correction

Two mistakes in our article on gene replacement by gene targeting at the his-3 locus (Margolin, B.S. et al., 1997, FGN 44:34-36) have come to our attention

Improved plasmids for gene targeting at the his-3 locus of Neurospora crassa by electroporation

We report two new plasmids, pBM60 and pBM61, and procedures to efficiently generate single- copy transformants targeted to the his-3 locus in Neurospora crassa