Mitchell J. Nathan

Learn More
This article explores the complementary strengths and weaknesses of grounded and abstract representations in the domain of early algebra. Abstract representations, such as algebraic symbols, are concise and easy to manipulate but are distanced from any physical referents. Grounded representations, such as verbal descriptions of situations, are more concrete(More)
Many students are being left behind by an educational system that some people believe is in crisis. Improving educational outcomes will require efforts on many fronts, but a central premise of this monograph is that one part of a solution involves helping students to better regulate their learning through the use of effective learning techniques.(More)
In this paper, we report findings from an analysis of the relationship between enrollment in a high school pre-college engineering curriculum and student achievement on state standardized tests. Using multilevel statistical modeling with students (N = 140) nested within teachers. We found that, while students gained in math and science achievement overall(More)
It is widely accepted that subject-matter expertise is critical for effective teaching, especially in secondary and post-secondary education. Yet, there are few examinations of the pitfalls for instruction that may be ascribed to expert subject-matter knowledge. One concern is when teachers' subject-matter expertise within a domain overshadows knowledge(More)
The importance of content knowledge on proficiency in teaching practices is well documented (Borko et al., 1992; Shulman, 1986). But is this statement completely unimpeachable? Are there drawbacks for teaching that are specifically due to subject matter expertise? In this paper we draw on evidence from mathematics and language arts education to show ways(More)
Multi-level analyses in a socially mediated middle school mathematics classroom reveal how intersubjectivity serves to structure and sustain the discourse while students collective solve a three-dimensional reasoning task. Speech events frequently exhibited co-occurrence of both positive and negative forms of intersubjectivity. This shows that interlocutors(More)
Coronavirus RNA evolves in the central nervous systems (CNS) of mice during persistent infection. This evolution can be monitored by detection of a viral quasispecies of spike deletion variants (SDVs) (C. L. Rowe, S. C. Baker, M. J. Nathan, and J. O. Fleming, J. Virol. 71:2959-2969, 1997). We and others have found that the deletions cluster in the region(More)