Abstract: Selective growth media N4 agars that include a combination of high levels of yeast extract, possibly higher levels of protein, elevated levels of sugar and reduced levels of sodium chloride. The combination of ingredients provides the ability to detect Salmonella spp. and Shigella spp. with almost identical sensitivity while alleviating false-negative and false-positive problems commonly encountered with the presence of Proteus spp. and Citrobacter spp.

Abstract: An HST propel system includes first and second pumps having displacements variable in response to movement of first (31) and second (33) control shafts, respectively; and a linkage arrangement for moving the control shafts in unison in response to movement of an operator input (37). The linkage arrangement comprises a crank arm (35) rotatable about its axis in response to movement of the input device, first (41) and second (51) input arms fixed relative to the crank arm, and first (45) and second (55) elongated control rods pivotally connected to the input arms. The system includes a swivel connector (43) cooperating with its input arm to define a swivel axis (S.A.1), fixed relative to the axis of the crank arm, and a swivel connector (53) cooperating with its input arm to define a swivel axis (S.A.2), moveable relative to the axis of the crank arm for straight tracking adjustment.

Abstract: A new Salmonella preferential media uses lactose and cellobiose to suppress formation of black colonies by non-Salmonella, to permit easy inspection of the media to determine the presence or absence of Salmonella. Modified media, including high levels of peptone, beef extract, and tris buffers are required for preferential detection of S. typhi, all other Salmonella and Shigella.

Abstract: A swift, accurate assay for the detection of salmonella contamination in a livestock environments, comprises sampling the floor of the livestock holding area with drag swabs for about 10 or more minutes, after which said swabs are maintained in a static condition, at reduced temperature, in the presence of double strength skim milk, until ready for testing. The swabs are transferred to a salmonella-preferential growth medium, such as tetrathionate broth and subsequently assayed. To reduce non-salmonella "look alike" or masking bacterial colonies, Novobiocin may be administered to the culture media.