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 The paperwas withdrawn from publication by Lewis early (...)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)

We examine the process of the emission of light from an atom that is in a relative translational motion with respect to the medium at rest in which the electromagnetic excitations propagate. The effect of Lorentz contraction of the of electron orbits on the emitted frequency is incorporated in the Rydberg formula, as well as the emitter’s Doppler effect is acknowledged. The result is that the frequency of the emitted light is modified by a factor that is identical with what (...) is called the ‘relativistic Doppler effect’. The new emission formula is applied for reinterpretation of the Ives-Stilwell experiment and shown that within the second order of approximation with respect to the speeds of the atom and the ‘absolute speed’ (Earth’s speed relative to the medium), the absolute motion does not affect the interference. The expression for the modification of the frequency involves both a first and a second-order term with respect to the speed of the atoms in the cathode tube. The latter turns out to be quantitatively the same as if the time would have changed its rate in the frame moving with the atoms. Thus, a new interpretation of the results of this famous experiment is provided without stipulating time dilation. (shrink)

Many of the things we do in social and political philosophy, whether normative or critical, presuppose some understanding and evaluation of agency. To have a clear idea of our normative or critical enterprise, the underlying account of agency needs spelling out. This article begins with a descriptive account: human agency consists in power (or causal efficacy) organized as subjectivity (or selfhood), and such organization takes place through attributions of power informed by values. Some such descriptive account is useful for understanding (...) and comparing forms of agency. But as we move beyond it to construct an evaluative account of agency, we face problems that are symptomatic of our social and political condition. While quantitative assessment of agency does not work, qualitative assessment seems out of place in our modern world of pluralism and yet is unavoidable for those who, like Habermas, take issue with such phenomena as colonization of the lifeworld. (shrink)

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)