Karmen Dykstra

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We propose a method to automatically detect emotions in unconstrained settings as part of the 2013 Emotion Recognition in the Wild Challenge [16], organized in conjunction with the ACM International Conference on Multimodal Interaction (ICMI 2013). Our method combines multiple visual descriptors with paralinguistic audio features for multimodal(More)
Spatial solute concentration profiles resulting from in vivo microdialysis were measured in rat caudate-putamen by quantitative autoradiography. Radiolabeled sucrose was included in the dialysate, and the tissue concentration profile measured after infusions of 14 min and 61.5 min in an acute preparation. In addition, the changes in sucrose extraction(More)
The concentration profiles of [14C]3'-azido-3'-deoxythymidine (AZT) emanating from an acutely implanted microdialysis probe were measured in rat caudate putamen by quantitative autoradiography for infusions of 14 min and 1 and 2 h. A mathematical model which simulated diffusive solute transport, unaffected by the processes of microvascular exchange or(More)
We applied in vivo microdialysis to assess the effects of dopaminergic and beta-adrenergic receptor stimulation on cyclic AMP efflux in rat striatum under chloral hydrate anesthesia. Dopamine (up to 1 mM) infused for 20 min through the probe did not increase cyclic AMP, whereas both the selective dopamine D1 agonist SKF 38393 and D2 antagonist sulpiride(More)
The production of the antifungal agent cycloheximide by Streptomyces griseus is typical of many antibiotic fermentations. In the initial stage of the fermentation, cell growth is extensive, while little antibiotic is produced. After roughly 24 hours, the biomass concentration remains relatively constant and accumulation of product in the fermentation broth(More)
Under physiological conditions, we observed the rapid, pH- and temperature-dependent, oxidative decarboxylation and hydration of 3,4-dihydroxyphenylacetic acid (DOPAC) to form 3,4-dihydroxybenzyl alcohol (DBAlc). This product was oxidized and underwent tautomerization to form 3,4-dihydroxybenzaldehyde (DBAld). This reaction did not occur in the presence of(More)
Student-teacher verbal communication contributes to successful learning outcomes. In this study we explore the use of conceptual-based recurrence plots to characterize the dynamics of student-teacher interaction. The results indicate: 1) Individual differences in teachers' speech styles 2) Teacher speech may reflect strategies that are sensitive to student(More)
The overarching goal of this project is to develop computational models of the nonverbal behavior and interactive strategies observed during face-to-face teaching. This project will help advance the science of learning and teaching by improving our understanding of the dynamics of nonverbal behavior in teaching at a computational level across multiple(More)
Two-dimensional polyacrylamide gel electrophoresis (2D PAGE) is a method of separating complex protein mixtures, such as whole cell extracts, on the basis of protein isoelectric point and molecular weight. In bioprocess engineering, conventional 2D PAGE has tremendous potential to yield detailed information on the intracellular effect of various process(More)
The fermentation of Streptomyces griseus for the production of cycloheximide is similar to other antibiotic fermentations in that product synthesis is subject to feedback regulation and the desired product is degraded in the fermentation broth. The productivity of this fermentation can thus be dramatically increased by removing the antibiotic from the whole(More)
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