Investigating the Interactions Between Cyanobacteria and Vibrio parahaemolyticus

One well-known pathogen that has been the topic of many recent studies is Vibrio parahaemolyticus, which causes thousands of foodborne illnesses a year, mostly from the ingestion of raw or undercooked oysters. It has been shown cyanobacteria can act as a long-term reservoir of Vibrio cholerae, another pathogenic Vibrio, by encasing the cells within mucilaginous sheaths during which Vibrios enter a viable but non-culturable state. In this study we investigated the interaction of V. parahaemolyticus with cyanobacteria to determine whether cyanobacteria aid in the longevity and survival of V. parahaemolyticus. We found that non-pathogenic V. parahaemolyticus strain G445 was able to persist better in the presence of cyanobacteria compared to pathogenic V. parahaemolyticus MDOH-04-5M732. G445 cells seem to cluster non-discriminately within the cyanobacterial mats, which may be due to specific interactions with cyanobacteria, yet further investigation is necessary

The effect of small variations in profile of airfoils

This report deals with the effect of small variations in ordinates specified by different laboratories for the airfoil section. This study was made in connection with a more general investigation of the effect of small irregularities of the airfoil surface on the aerodynamic characteristics of an airfoil. These tests show that small changes in airfoil contours, resulting from variations in the specified ordinates, have a sufficiently large effect upon the airfoil characteristics to justify the taking of great care in the specification of ordinates for the construction of models

SHORT-PERIOD PRICING MODELS FOR FED CATTLE AND IMPACTS OF WHOLESALE CARCASS BEEF AND LIVE CATTLE FUTURES MARKET PRICES

Demand and Price Analysis,

Comparison of Survey Results from Land Value & Rental Surveys: Differences and Synthesis

Land Economics/Use,

The Interference Effects on an Airfoil of a Flat Plate at Mid-span Position

This report gives the results of an investigation of the mutual interference of an airfoil and a flat plate inserted at mid-span position. The tests were conducted in the Variable-Density Wind Tunnel of the National Advisory Committee for Aeronautics at a high value of the Reynolds Number. The interference effects of this combination were found to be small. Supplementary tests indicated that the use of fillets decreases both the lift and drag slightly. A bibliography of publication dealing with interference between wings and bodies, and with the effects of cut-outs and fillets is included

Beef Packers’ Captive Supplies: An Upward Trend? A Pricing Edge?

Livestock Production/Industries,

AN EMPIRICAL STUDY OF COMPETITION IN THE PRICE DISCOVERY PROCESS FOR SLAUGHTER LAMBS

Buyer competition in the price discovery process for slaughter lambs at an Oklahoma teleauction was studied. Number of buyers positively influenced both absolute and relative sale prices but did not significantly affect buyer gross margins. Buyer market shares also affected prices paid and buyer gross margins. Thus, competition among buyers was found to be important in the price discovery process.Demand and Price Analysis, Livestock Production/Industries,

Preferential Cattle and Hog Pricing by Packers: Evidence from Mandatory Price Reports

Preferential pricing was one of several concerns leading to mandatory price reporting. Seven years of “new” data from mandatory reports are examined to determine if evidence exists of preferential pricing by packers for fed cattle and slaughter hogs. Weekly data show some alternative marketing methods track closer to cash market prices than others. Some differences can be explained, while others are not as clear. Evidence was found that cash prices lead prices for alternative marketing methods on rising markets but trail them on declining markets.Alternative marketing arrangements, Cattle, Hogs, Marketing, Meatpacking procurement, Price discovery, Pricing, Livestock Production/Industries, Marketing,

Interference Effects and Drag of Struts on a Monoplane Wing

Tests were conducted in the Variable Density Wind Tunnel of the NACA to determine the importance of the interference effects and drag of struts on a monoplane. Inclined struts were placed upon a Gottingen 387 airfoil in the lower surface positions and in two upper surface positions. Tests were made at values of Reynolds Number comparable with those obtained in flight. It was found that the interference drag of struts may be as great as the drag of the struts alone