Hydrodynamic studies on monomer chromatin subunits (v1) as a function of ionic strength (0.7 mM to 100 mM KCl) indicate two salt-dependent conformational transitions. An abrupt transition occurs at about 7.5 mM ionic strength. Decreasing the ionic strength from 10 to 5 mM results in a decrease in s20,w of the v1 from 11.1 to 9.9 S. The diffusion coefficient D20,w decreases from 3.3 to 2.7 X 10(...

Numerous statistical and dynamical models have been developed in recent years to forecast ENSO events. However, for most of these models predictability for lead times over 10 months is limited. It has been hypothesized that the tropical Pacific thermocline structure may have critical information to permit longer lead ENSO forecasts. Models that use subsurface sea temperature information have al...

P u r i f i e d D20 i c e w a s i r r a d i a t e d w i t h p u l s e s o f 0.53 MeV e l e c t r o n s a n d t h e s p e c t r a l d i s t r i b u t i o n s o f t h e l u m i n e s c e n c e i n t e n s i t y a n d h a l f l i f e w e r e r e c o r d e d b e t w e e n 200 a n d 800 nm. E m i s s i o n p e a k s w e r e o b s e r v e d a t 390 a n d 540 nm a n d i t w a s s h o w n t h a t n o n...

Theorell (1942) has reported sedimentation and diffusion measurements on peroxidase: our value for S20 (corr.) is about 10% lower than his (3-85 x 10-13) (cf. Cecil & Ogston, 1948), while our value for D20 (corr.) agrees fairly well with his value of 6 84 x 1o-7. Our value for the molecular weight is lower than Theorell's (44,100), but is in agreement with that calculated by Keilin & Hartree (1...

This paper considers a stylized model of network formation in which relations among agents are subject to frictions, as described in Bala and Goyal [A non cooperative model of network formation, Econometrica 68 (2000) 1181–1231]. We analyze the process of network formation in a dynamic framework where selfinterested individuals can form or delete links and, occasionally, make mistakes. Then, us...

that the yield of matrix-trapped excess electrons in D 2 0 is larger than in H20 and concluded that D 2 0 is less efficient in the initial electron localization (to yield the solvated electron) than HzO. Our results do not, however, answer the question whether a solvated electron represents the ground state of a cluster anion comprised of as few as 12 water molecules. The reason for this differ...

Noncognitive Abilities and Within-Group Wage Inequality This paper argues that endogenous restructuring processes within firms towards productivityenhancing human resource activities, triggered by advances in information and communication technologies (ICT) and rising supply of educated workers, are typically associated with higher demand for noncognitive abilities. Consistent with the evolutio...

The article suggests that the emergence of FabLabs and other collaborative spaces innovation imply new modes manufacturing, based on a more social, inclusive, open approach than current industrial mass-production models. We argue are platforms social allowing different combinations interactions between industries individuals, through their activities around making (producing goods from raw mate...

The estimation of optimal support boundaries under the monotonicity constraint is relatively unexplored and still in full development. This article examines a new extreme-value based model which provides a valid alternative for completely envelopment frontier models that often suffer from lack of precision, and for purely stochastic ones that are known to be sensitive to model misspecification....

M.A. Lone, W.J. Edwards and R. Collins AECL Research, Chalk River Laboratories Chalk River, Ontario, Canada. KOJ lJO (613)-584-3311 Thermal neutron capture cross section of the 9%r(n,y)91 Sr reaction was measured in a D20 moderated neutron flux with an activation technique. The sensitivity of the measurement was improved by using chemical separation of 90Y from 91 Sr for reduction of the intens...