Gold(I)-catalysed one-pot synthesis of chromans using allylic alcohols and phenols

A gold(I)-catalysed reaction of allylic alcohols and phenols produces chromans regioselectively via a one-pot Friedel–Crafts allylation/intramolecular hydroalkoxylation sequence. The reaction is mild, practical and tolerant of a wide variety of substituents on the phenol

On the robustness of acoustic black hole spectra

We study the robustness of the spectrum emitted by an acoustic black hole by considering series of stationary flows that become either subsonic or supersonic, i.e. when the horizon disappears. We work with the superluminal Bogoliubov dispersion of Bose--Einstein condensates. We find that the spectrum remains remarkably Planckian until the horizon disappears. When the flow is everywhere supersonic, new pair creation channels open. This will be the subject of a forthcoming work.Comment: 4 pages, 2 figure, jpconf.cls; to appear in the proceedings of the Spanish Relativity Meeting ERE201

Botany at Eastern Illinois University

Eastern Illinois University was established in 1899, and from its beginning recognized the importance of the botanical sciences. Two terms of botany were required for the four year program. Otis W. Caldwell, a botanist, was one of the original faculty members. He taught all of the biology courses and initiated the acquisition of a greenhouse. Caldwell was the first of a series of talented and dedicated botany professors including Edgar N. Transeau, Ernest L. Stover, Hiram F. Thut and John E. Ebinger. These and many other professors incorporated a field component into almost all classes. This dedication to the study of plants in their natural habitat led to one of the finest programs in the nation for training field botanists. By 1923, a formal Botany Department was established and in the late 1960’s EIU began awarding a M.S. in Botany. At this time, over 40 different undergraduate and graduate courses were offered with 95% having a lab component. The excellence of the program was recognized in Illinois where organizations such as the Illinois Department of Natural Resources and the Illinois Natural History Survey relied on graduates from the EIU Botany Department for their field botanists. In 1992, the American Phytopathological Society recognized the department for its contribution to plant pathology. Between 1913 and 1993, six hundred and nine students graduated with degrees in Botany, and 121 continued to receive their doctorates in botanical fields. Although numbers of botany majors rose during early to mid 1990’s, an administrative decision was made in 1998 to combine the Botany Department with the Zoology Department into a Biological Sciences Department. Since the merger, the B.S. in Botany was eliminated. Unfortunately, the elimination of this Botany Department is an example of past national trends to eliminate Botany Departments even with exceptional reputations

Botany at Eastern Illinois University

Eastern Illinois University was established in 1899, and from its beginning recognized the importance of the botanical sciences. Two terms of botany were required for the four year program. Otis W. Caldwell, a botanist, was one of the original faculty members. He taught all of the biology courses and initiated the acquisition of a greenhouse. Caldwell was the first of a series of talented and dedicated botany professors including Edgar N. Transeau, Ernest L. Stover, Hiram F. Thut and John E. Ebinger. These and many other professors incorporated a field component into almost all classes. This dedication to the study of plants in their natural habitat led to one of the finest programs in the nation for training field botanists. By 1923, a formal Botany Department was established and in the late 1960’s EIU began awarding a M.S. in Botany. At this time, over 40 different undergraduate and graduate courses were offered with 95% having a lab component. The excellence of the program was recognized in Illinois where organizations such as the Illinois Department of Natural Resources and the Illinois Natural History Survey relied on graduates from the EIU Botany Department for their field botanists. In 1992, the American Phytopathological Society recognized the department for its contribution to plant pathology. Between 1913 and 1993, six hundred and nine students graduated with degrees in Botany, and 121 continued to receive their doctorates in botanical fields. Although numbers of botany majors rose during early to mid 1990’s, an administrative decision was made in 1998 to combine the Botany Department with the Zoology Department into a Biological Sciences Department. Since the merger, the B.S. in Botany was eliminated. Unfortunately, the elimination of this Botany Department is an example of past national trends to eliminate Botany Departments even with exceptional reputations

Black hole lasers, a mode analysis

We show that the black hole laser effect discovered by Corley & Jacobson should be described in terms of frequency eigenmodes that are spatially bound. The spectrum contains a discrete and finite set of complex frequency modes which appear in pairs and which encode the laser effect. In addition, it contains real frequency modes that form a continuous set when space is infinite, and which are only elastically scattered, i.e., not subject to any Bogoliubov transformation. The quantization is straightforward, but the calculation of the asymptotic fluxes is rather involved. When the number of complex frequency modes is small, our expressions differ from those given earlier. In particular, when the region between the horizons shrinks, there is a minimal distance under which no complex frequency mode exists, and no radiation is emitted. Finally, we relate this effect to other dynamical instabilities found for rotating black holes and in electric fields, and we give the conditions to get this type of instability.Comment: 19 pages, 3 figures, main changes: new figure and new Sec.6 `conditions for having a laser effect', final version accepted in PR

Impact of power plants on aquatic systems: a social perspective

Topics discussed are: aquatic effects of thermal electric power stations; legal aspects of water pollution; EPA provisions for levels of thermal discharges to assure protection and propagation of a balanced, indigenous population of shellfish, fish, and wildlife in a body of water; cost benefit analysis of steam electric power effluents; cooling systems and siting of power plants; simulation modeling of population dynamics; and sociological aspects of water pollution. (HLW

Botany at Eastern Illinois University

Eastern Illinois University was established in 1899, and from its beginning the importance of the botanical sciences was recognized. Two terms of botany were required for the four year program. Dr. Otis W. Caldwell, a botanist, was one of the original faculty members. He taught all of the biology courses and initiated the acquisition of a greenhouse. Caldwell was the first in a series of talented and dedicated botany professors including Edgar N. Transeau, Ernest L. Stover, Hiram F. Thut and John E. Ebinger. These and many other professors incorporated a field component into almost all classes. This dedication to the study of plants in their natural habitat led to one of the finest programs in the nation for training field botanists. By 1923, a formal Botany Department was established and in the late 1960’s EIU began awarding a M.S. in Botany. In the 60’s, the department greatly expanded with 15 faculty hires and over 40 different undergraduate and graduate courses were offered with 95% having a lab component. The excellence of the program was recognized in Illinois where organizations such as the Illinois Department of Natural Resources and the Illinois Natural History Survey relied on graduates from the EIU Botany Department for their field botanists. In 1992, the American Phytopathological Society recognized the department for its contribution to plant pathology. Between 1913 and 1993, six hundred and nine students graduated with degrees in Botany, and 121 continued to receive their doctorates in botanical fields. Although numbers of botany majors rose during early to mid 1990’s, an administrative decision was made in 1998 to combine the Botany Department with the Zoology Department into a Biological Sciences Department. Since the merger, the B.S. in Botany was eliminated. Unfortunately, the elimination of this Botany Department is another example of past national trends to eliminate Botany Departments even with exceptional reputations

Evidence for in situ and in vitro association between beta-dystroglycan and the subsynaptic 43K rapsyn protein. Consequence for acetylcholine receptor clustering at the synapse.

The accumulation of dystrophin and associated proteins at the postsynaptic membrane of the neuromuscular junction and their co-distribution with nicotinic acetylcholine receptor (AChR) clusters in vitro suggested a role for the dystrophin complex in synaptogenesis. Co-transfection experiments in which alpha- and beta-dystroglycan form a complex with AChR and rapsyn, a peripheral protein required for AChR clustering (Apel, D. A., Roberds, S. L., Campbell, K. P., and Merlie, J. P. (1995) Neuron 15, 115-126), suggested that rapsyn functions as a link between AChR and the dystrophin complex. We have investigated the interaction between rapsyn and beta-dystroglycan in Torpedo AChR-rich membranes using in situ and in vitro approaches. Cross-linking experiments were carried out to study the topography of postsynaptic membrane polypeptides. A cross-linked product of 90 kDa was labeled by antibodies to rapsyn and beta-dystroglycan; this demonstrates that these polypeptides are in close proximity to one another. Affinity chromatography experiments and ligand blot assays using rapsyn solubilized from Torpedo AChR-rich membranes and constructs containing beta-dystroglycan C-terminal fragments show that a rapsyn-binding site is present in the juxtamembranous region of the cytoplasmic tail of beta-dystroglycan. These data point out that rapsyn and dystroglycan interact in the postsynaptic membrane and thus reinforce the notion that dystroglycan could be involved in synaptogenesis

Hawking radiation of massive modes and undulations

We compute the analogue Hawking radiation for modes which posses a small wave vector perpendicular to the horizon. For low frequencies, the resulting mass term induces a total reflection. This generates an extra mode mixing that occurs in the supersonic region, which cancels out the infrared divergence of the near horizon spectrum. As a result, the amplitude of the undulation (0-frequency wave with macroscopic amplitude) emitted in white hole flows now saturates at the linear level, unlike what was recently found in the massless case. In addition, we point out that the mass introduces a new type of undulation which is produced in black hole flows, and which is well described in the hydrodynamical regime.Comment: 37 pages, 8 figures, published versio