Analytic stochastic treatment of a nonlinear quantum model with negative diffusion

We apply a proposal of Yuen and Tombesi, for treating stochastic problems with negative diffusion, to the analytically soluble problem of the single-mode anharmonic oscillator. We find that the associated stochastic realizations include divergent trajectories. It is possible, however, to solve the stochastic problem exactly, but the averaging must be performed with great care.Comment: Phys.Rev.

Resolution in rotation measurements

The limiting resolution in optical interferometry is set by the number of photons used, with the functional dependence determined by the state of light that is prepared. We consider the problem of measuring the rotation of a beam of light about an optical axis and show how the limiting resolution depends on the total number of quanta of orbital angular momentum carried by the light beam.Comment: 14 page

From Differentiated Coffee Markets Towards Alternative Trade and Knowledge Networks

This chapter presents a case study focusing on the Community Agroecology Network (CAN), an organization started by the United States and Mesoamerica’s activists, whose effort is to create an alternative trade and knowledge network. The basic aim behind CAN is to benefit conservation and social development efforts by linking producers, consumers, and producer organizations. CAN is a response to the problems arising out of the dominance of certification processes in Fair Trade and organic coffee networks, and the chapter discusses the organization’s main goals of intercommunity relationship development, direct coffee marketing, and ecological sustainability. It moots a comparison between alternative agro-food networks and CAN on the grounds of biodiversity conservation, empowerment, and enhanced livelihoods

Guide to the US collection of antarctic meteorites 1976-1988 (everything you wanted to know about the meteorite collection). Antarctic Meteorite Newsletter, Volume 13, Number 1

The state of the collection of Antarctic Meteorites is summarized. This guide is intended to assist investigators plan their meteorite research and select and request samples. Useful information is presented for all classified meteorites from 1976 to 1988 collections, as of Sept. 1989. The meteorite collection has grown over 13 years to include 4264 samples of which 2754 have been classified. Most of the unclassified meteorites are ordinary chondrites because the collections have been culled for specimens of special petrologic type. The guide consists of two large classification tables. They are preceded by a list of sample locations and important notes to make the tables understandable

The activation of KSHV lytic cycle blocks autophagy in PEL cells

This study confirms that autophagy is activated concomitantly with KSHV lytic cycle induction, and that autophagy inhibition by BECN1 knockdown reduces viral lytic gene expression. In addition, we extend previous observations and show that autophagy is blocked at late steps, during viral replication. This is indicated by the lack of colocalization of autophagosomes and lysosomes and by the LC3-II level that does not increase in the presence of bafilomycin A1 in primary effusion lymphoma (PEL) cells induced to enter the lytic cycle, either by TPA/sodium butyrate (BC3 and BCBL1) or by doxycycline (TRExBCBL1-Rta). The autophagic block correlates with the downregulation of RAB7, whose silencing with specific siRNA results in an autophagic block in the same cells. Finally, by electron microscopy analysis, we observed viral particles inside autophagic vesicles in the cytoplasm of PEL cells undergoing viral replication, suggesting that they may be involved in viral transpor