Karshish, the picker-up of learning's crumbs, The not-incurious in God's handiwork (This man's flesh He hath admirably made, Blown like a bubble, kneaded like a paste, To coop up and keep down on earth a space, That puff of vapour from His mouth, man's soul). Browning.

Cytoplasmic protein-tyrosine kinases (PTKs) are enzymes involved in transducing a vast number of signals in metazoans. The importance of the Tec family of kinases was immediately recognized when, in 1993, mutations in the gene encoding Bruton's tyrosine kinase (Btk) were reported to cause the human disease X-linked agammaglobulinemia (XLA).(1,2) Since then, additional kinases belonging to this family have been isolated, and the availability of full genome sequences allows identification of all members in selected species enabling phylogenetic considerations. Tec kinases are (...) endowed with Pleckstrin homology (PH) and Tec homology (TH) domains and are involved in diverse biological processes related to the control of survival and differentiation fate. Membrane translocation resulting in the activation of Tec kinases with subsequent Ca2+ release seems to be a general feature. However, nuclear translocation may also be of importance. The purpose of this essay is to characterize members of the Tec family and discuss their involvement in signaling. The three-dimensional structure, expression pattern and evolutionary aspects will also be considered. BioEssays 23:436–446, 2001. © 2001 John Wiley & Sons, Inc. (shrink)

Three major strategies exist for the protection of endangered habitat and species: (1) land acquisition programs, (2) government legislation and regulatory agencies, and (3) "stewardship" programs that are voluntary and community-based. While all of these strategies have merit, we suggest that stewardship holds particular advantages and should be considered more often as a strategy of first choice. In this article, we examine the Municipal Wetland Stewardship program of Newfoundland, a popular and successful Canadian policy for the local protection of wetlands. (...) Important issues are at stake: competing philosophical foundations for managerial ecology, the value of "local ecological knowledge," principles of community-based conservation, the question of whether stewardship empowers local communities or controls them from afar, and ethical conflicts around American colonialism, hunting, and ecotourism. The results suggest that despite some potentially problematic ironies, the Newfoundland program provides a model for a public policy aimed both at the pragmatics of biophysical sustainability and at the ideals of environmental ethics, social justice, and democratic politics. (shrink)

Editor's Note: This paper was found in galley proof form from the journal Mind in the C.I. Lewis Archives in the Special Collections Department of the Stanford University Libraries, call number M174, Box 18, Folder 1. There are two copies of the proofs in this folder, one includes Lewis's corrections. The version that appears here incorporates all of Lewis's corrections. Where these corrections are substantive, the original wording is give in a footnote. The paperwas withdrawn from publication by Lewis early (...) in 1935. The proofs were found with Lewis's other papers in his house in Menlo Park after his death in 1964. (shrink)