Immunochemical studies on human plasma lipoproteins

Some years ago, a series of human serum lipoproteins, distinguishable by their hydrated densities and lipid-protein ratios were recognized and isolated by ultracentrifugal techniques (1). Certain of these lipoproteins are invariably present in human serum and the concentrations of these and of others can be quantitatively correlated with disease (2). No difference in the lipoprotein distribution can be demonstrated between serum and plasma. The purpose of this investigation was to obtain information about the immunochemical specificity of some of the lipoproteins

A Carpentries Approach to ACRL Framework Instruction

Objective: This paper compares the pedagogical theory driving current norms towards instruction of novices in both fields, specifically focusing on The Carpentries and ACRL Framework instruction. I identify key areas of difference in theoretical and practical approaches towards education of learners entirely new to a topic, focusing on a choice to pursue constructivist or experiential learning versus providing direct instructional guidance. Methods: Two case studies are explored through the lens of the Dreyfus Model of learning for their theoretical underpinings for engaging novice learners: the ACRL Framework and Carpentries’ Instructor Training. Results: Applying the Dreyfus Model of learning and cognitive load theory shows theoretical benefits to direct instructional guidance over constructivist or minimally guided instruction. Conclusions: The ACRL Framework and Carpentries workshops share teaching goals of creating new mental models and core skills to support future learning, but differ in their pedagogical approaches. For novice learners of information literacy, there may be value in considering a more guided approach. Concrete lesson-planning strategies are proposed. The substance of this article is based upon a poster presented at RDAP Summit 2019

Modified Scaling Relation for the Random-Field Ising Model

We investigate the low-temperature critical behavior of the three dimensional random-field Ising ferromagnet. By a scaling analysis we find that in the limit of temperature $T \to 0$ the usual scaling relations have to be modified as far as the exponent $\alpha$ of the specific heat is concerned. At zero temperature, the Rushbrooke equation is modified to $\alpha + 2 \beta + \gamma = 1$, an equation which we expect to be valid also for other systems with similar critical behavior. We test the scaling theory numerically for the three dimensional random field Ising system with Gaussian probability distribution of the random fields by a combination of calculations of exact ground states with an integer optimization algorithm and Monte Carlo methods. By a finite size scaling analysis we calculate the critical exponents $\nu \approx 1.0$, $\beta \approx 0.05$, $\bar{\gamma} \approx 2.9$ $\gamma \approx 1.5$ and $\alpha \approx -0.55$.Comment: 4 pages, Latex, Postscript Figures include