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Teaching is more than a career. In many ways, it is an identity. Teachers who choose independent schools value independent thinking, a focus on the individual, and recognition of context and complexity. But when teachers who deeply value autonomy and question hierarchical control become teacher leaders--as department chairs, grade level team leaders, instructional coaches, and so on--they face practical, intellectual, and emotional challenges. What makes them value independent schools can make it hard to orient leadership within their self-concept. In this article, the author discusses the challenges of teacher-leadership in independent schools.

The synthesis and characterization of photonucleases N,N'-bis[2-[bis(1H-imidazol-4-ylmethyl)amino]ethyl]-3,6-arcidinediamine and N-[2-[bis(1H-imidazol-4-ylmethyl)amino]-3,6-acridinediamine, consisting of a central 3,6-acridinediamine chromophore attached to 4 and 2 metal-coordinating imidazole rings, respectively, are reported. The data indicates that buffer, pH, Hg(II), Fe(III), Cd(II), Zn(II), V(V), Pb(II), and light can be used to tune DNA cleavage by N,N'-bis[2-[bis(1H-imidazol-4-ylmethyl)amino]ethyl]-3,6-arcidinediamine under physiologically relevant conditions.

The Drosophila columnar genes are key regulators of neural precursor formation and patterning along the dorsal-ventral axis of the developing CNS and include ventral nerve cord defective (vnd), intermediate nerve cord defective (ind), muscle segment homeodomain (msh), and Epidermal growth factor receptor (Egfr). To investigate the evolution of neural pattern formation, we identified and determined the expression patterns of Tribolium vnd, ind, and msh, and found that they are expressed in the medial, intermediate, and lateral columns of the developing CNS, respectively, in patterns similar, but not identical, to their Drosophila orthologs. The pattern of Egfr activity suggests that the genetic regulatory mechanisms that initiate Tc-vnd expression are similar in Drosophila and Tribolium, whereas those that initiate Tc-ind have diverged. RNAi analyses of gene function show that Tc-vnd and Tc-ind promote the formation of medial and intermediate column neural precursors and that vnd-mediated repression of ind establishes the boundary between the medial and intermediate columns. These data suggest that columnar gene expression and function underlie neural pattern formation in Drosophila, Tribolium, and potentially all insects, but that subtle spatiotemporal differences in expression of these genes may produce species-specific morphological differences. Keywords: Tribolium; Vnd; Ind; Msh; Evolution; CNS; Achaete-Scute

This paper develops algorithms for calculating commonly used energy measures directly from the data stream of wavelet-compressed images. Incorporating these techniques into an underlying computational kernel allows many image-processing tasks to be efficiently implemented in the compressed domain. Compared to traditional decompress-process methods, the proposed techniques offer significant memory savings and reduce the computational load of the system. Experimental results show that the calculated energy values are accurate and obtained with less strain on system resources. The potential savings achieved by incorporating the proposed kernel are illustrated in a texture classification example. Index Terms--Compressed-domain processing, energy measurement, texture classification, wavelet transform.

The Association of Departments of Family Medicine (ADFM), as part of its mission, has made diversity, inclusion, and health equity priorities. This mission is being carried out with adherence to [...]