Strategies for administration of biosurfactants-producing pseudomonads in closed hydroponic systems

Zoospore-producing oomycetes are major plant pathogens of particular concern in hydroponic systems. Compared with pesticides, biocontrol using antagonistic microorganisms is a sustainable approach to control oomycetes. Previous research has demonstrated that biosurfactants and biosurfactant-producing microorganisms are potentially useful components of a sustainable biocontrol strategy. In this study three ways of supplying a biosurfactant-producing strain to a recirculating hydroponic cultivation system infected with a zoospore-producing plant pathogen were evaluated. The strain P. koreensis 2.74 was added as washed cells, in its spent KB broth or in a minimal medium adapted from the nutrient solution, and compared with control treatments. A significant reduction in disease with up to 50% was achieved when a high concentration of washed cells was added weekly to the plant cultivation system. The disease suppression obtained through addition of washed cells equalled the effect achieved when the purified biosurfactant was used. Phytotoxicity was observed when the spent broth was included in the treatment

We Both Eat Rice, But That\u27s About It: Korean and Latino Relations in a Multi-Ethnic City

On any given day, in any given restaurant in Koreatown, countless orders are taken, meals are served, tables are cleared, dishes are washed, and checks are paid. Down the street at a corner convenience store, shelves are stocked, beverages are placed into large refrigerators, and purchases are rung up. Even to the most casual observer, it becomes obvious that Korean workers take the orders and collect the money while Latino workers replenish the shelves, clear the tables, and wash the dishes

Volume 55, Number 1 - November 1975

Volume 55, Number 1 - November 1975. 27 pages including covers and advertisements. Contributions Slonina, Patricia L. Taking Out the Boat Prevey, Debra impressions: fall Tremblay, Bill Janis Joplin & The Invention of Barbed Wire Schaffer, Dora Bounty Hunter Coskren, Thomas M., O.P. A Better Parlor: Setting as Meaning in Henry James\u27s The Bostonians Maciag, Drew My Heart Is A Japanese Garden Like Paper Blossoms In A Chinese Sunset McCrorie, Edward Big Tree Talk Avakian, Robert M. Crystal Sphericon Windows Gray, Jereld Complaint Picararo, Steve Rousseau! Rousseau! Selley, April Love Poem Perel, Jane Lunin Bass Head Washed Up on Shore at Galilee, R.I., July 16, 1975 Woody, Michael M. The Elegy Logan, S. What The Fish Sees Photograph McCrorie, Edwar

Villanelle: Flood Time

The skies above just opened up, hear how the torrent roars… On city streets, through parks and lots, our stains are washed away

Optical conductivity of the Frohlich polaron

We present accurate results for optical conductivity of the three dimensional Frohlich polaron in all coupling regimes. The systematic-error free diagrammatic quantum Monte Carlo method is employed where the Feynman graphs for the momentum-momentum correlation function in imaginary time are summed up. The real-frequency optical conductivity is obtained by the analytic continuation with stochastic optimization. We compare numerical data with available perturbative and non-perturbative approaches to the optical conductivity and show that the picture of sharp resonances due to relaxed excited states in the strong coupling regime is ``washed out''by large broadening of these states. As a result, the spectrum contains only a single-maximum broad peak with peculiar shape and a shoulder.Comment: 4 pages, 6 ps-figure

The Aharonov-Bohm effect in mesoscopic Bose-Einstein condensates

Ultra-cold atoms in light-shaped potentials open up new ways to explore mesoscopic physics: Arbitrary trapping potentials can be engineered with only a change of the laser field. Here, we propose using ultracold atoms in light-shaped potentials to feasibly realize a cold atom device to study one of the fundamental problems of mesoscopic physics, the Aharonov-Bohm effect: The interaction of particles with a magnetic field when traveling in a closed loop. Surprisingly, we find that the Aharonov-Bohm effect is washed out for interacting bosons, while it is present for fermions. We show that our atomic device has possible applications as quantum simulator, Mach-Zehnder interferometer and for tests of quantum foundation.Comment: 5 pages, 5 figures to be published in Physical Review A Rapid Communication

The Electroweak Phase Transition in a Nonminimal Supersymmetric Model

We study the electroweak phase transition in a supersymmetric version of the Standard Model, in which a gauge singlet superfield is added to the Higgs sector. We show that the order of the transition is determined by the trilinear soft supersymmetry breaking terms rather than by the $O ( m^{3} T )$ term in the 1-loop, $T\neq0$ corrections. This fact removes the Standard Model upper bound on the Higgs mass, $m_{H} < 55 GeV$, coming from the requirement that baryon asymmetry is not washed out by anomalous electroweak processes. We perform a numerical analysis of parameter space including in the effective potential top-stop contribution to 1-loop radiative corrections. We find that this model is compatible with the preservation of baryon asymmetry for masses of the lightest scalar up to about 170 GeV.Comment: 23 pages, LaTeX, DFPD/92/TH/3

Development of flame resistant treatment for Nomex fibrous structures

Flame resistant fibrous materials for space shuttle application were developed through chemical modification of commercially available aromatic polyamide fibrous products. The new surface treatment was achieved in the laboratory by ultraviolet activation of the fabric in the presence of fluoroolefin monomers and a diluent gas. The monomers grafted under these conditions provide the improved properties of the fabric in flame resistance, chemical inertness, and nonwettability without the sacrifice of color or physical properties. The laboratory reaction vessel was scaled-up to a batch continuous process, which treats ten yards of the commercial width textiles. The treated commercial width Nomex (HT-10-41) from the scaled-up reactor is self-extinguishing in an oxygen-enriched environment, water-repellent, soft, silky, and improved in chemical resistance. Unlike most textile processes, the grafting unit operates under dry conditions and no chemical by-products have to be washed out of the finished product

[Review of] Stephen Glazier, ed. Caribbean Ethnicity Re visited

Like marine life washed up on a beach, most Caribbean peoples have been brought where they are by powerful forces outside their control. These forces include colonialism, slavery, and revolution, processes in the seventeenth and eighteenth century that convulsed Europe and whose effects spread to much of the rest of the world. Just as tidepools a few feet apart can have completely different sets of animal and plant life, Caribbean islands just a few miles apart can have completely different histories and mixtures of peoples. Mirroring the complexity of the life in these tidepools, there are myriad interpretations of the effects of different historical, structural, cultural and other factors on the region. Stephen Glazier has selected a set of articles received from a call for papers placed in newsletters of the Caribbean Studies Association and the American Anthropological Association