Chemical, Physical, and Sensory Properties of a Sweet Potato French-Fry Type Product During Frozen Storage

Chemical, physical, and sensory properties of a sweet potato Frenchfry type product were determined after 0, 3, 6, 9, and 12 months frozen storage. Analyses included measurements of dry matter, sugars, alcohol insoluble solids, carotene, vitamin C, color, texture and sensory panel scores for color, flavor and texture. Few changes were observed except for an appreciable loss (58%) in vitamin C and an apparent increase in carotene (27%). A partial drying treatment before freezing increased the rate of ascorbic acid loss. For the fried product, no appreciable storage-induced changes were noted in the sensory scores for color, flavor and texture thus indicating that the product had good stability in frozen storage.     

Effect of Curing on Sensory Properties and Carbohydrate Composition of Baked Sweet Potatoes

In a two-year study, the flavor and texture profiles and carbohydrate composition of cured, baked‘Jewels’sweet potatoes were compared to baked, uncured‘Jewels’sweet potatoes. Curing increased the rate of production of flavor notes and only slightly influenced development of “moist” mouthfeel. Given sufficient time after harvest, baked, cured roots were indistinguishable from baked, uncured roots. Carbohydrate content was not a sensitive indicator of post-harvest treatment since no statistically significant differences were detected between cured and uncured roots.     

Ascospore Heat Resistance and Control Measures for Talaromyces flaws Isolated From Fruit Juice Concentrate

Talarotnyces flavus were isolated from fruit juice concentrates in two unrelated spoilage incidences of packaged reconstituted fruit juice. The population of survivors in heated fruit concentrate was 0.6 colony forming units (CFU) per gram. The ellipsoidal ascospores diameters were 4.5 ± 6 μm. Potassium sorbate and sodium benzoate prevented outgrowth of T. flavus, the concentration required was lower when the pH of the growth medium was 3.5 instead of 5.4. Conidia were sensitive to 70% ethanol, but ascospores were resistant. Ascospores required heat activation before maximum outgrowth occurred, the time for activation was less with higher activation temperature. Thermal death rate curves were nonlogarithmic but approached logarithmic death rate at higher temperatures. A calculated thermal destruction rate, using the exponential formula, for 1 log₁₀ was 2–7 min at 90°C depending upon the strain; and the approximate z-value was 10.3°C.     

Strain Effects and Spalling in Alpha-Bombarded ThO2

Samples of bulk polycrystalline ThO₂ were bombarded with 5-MeV α-particles to doses between 9.4×10¹⁶ and 6.0×10¹⁷ ions/cm². The sample which received the highest dose spalled during bombardment; those receiving lower doses either did not spall or did so only after postirradiation annealing. The spalling was investigated by X-ray analysis and replica and transmission electron microscopy. It is concluded that spalling resulted from severe lattice strains at the interface between damaged and undamaged material and that sintering pores played a part in the fracture process. The role of lattice defects in initiating fracture is discussed.     

Endotracheal naloxone reversal of morphine-induced respiratory depression in rabbits

In an emergency, intravenous access may be difficult to obtain rapidly. Alternate routes of administration for drugs are, therefore, desirable. Our study was performed to determine if naloxone could be efficacious in reversing morphine-induced respiratory depression in rabbits when administered using the endotracheal route. Our results indicate that naloxone administered in this fashion is effective in reversing morphine-induced respiratory depression in the rabbit. Mean minute ventilation was depressed to greater than half of resting baseline levels using morphine sulfate. Endotracheally administered naloxone reversed this respiratory depression and resulted in a greater than five-fold increase in mean minute ventilation above baseline levels. We concluded that endotracheal naloxone is efficacious in reversing morphine-induced respiratory depression in the rabbit. The endotracheal route may be an effective alternative for naloxone administration in man when rapid intravenous access is not obtainable.     

Disaccommodation of Mn-Zn Ferrite After Temperature Cycling

It was shown that cycling Mn-Zn ferrite through or near the temperature of the zero crossing of the anisotropy constant K ₁ makes significant changes in the domain patterns and thus changes in disaccommodation rates. For the ferrite studied, with a secondary peak in permeability at—65°C, cycling to −80° or rapid cooling to −40° from room temperature affected the permeability and disaccommodation in a manner very similar to that of an ac demagnetization. Likely mechanisms which may explain these effects are discussed.     

Mechanism of Creep in MgO Brick

Creep of selected brands of periclase refractories was studied using rate process theory to provide information on activation energy and on the dominant method of deformation. A brand studied over the range 2200° to 2600°F at 25 psi gave an activation energy of 62 kcal/mole. All brands were studied at selected stresses and 2500°F to determine the flow mechanism. Plastic flow was indicated for all brands tested.     

Water-Soluble Flavor and Odor Precursors of Meat. 4. Influence of Cooking on Nucleosides and Bases of Beef Steaks and Roasts and Their Relationship to Flavor, Aroma and Juiciness

SUMMARY: Cooking resulted in significant increases in adenylic acid, total purine nucleosides and bases of 80 beef roasts of eight different cuts. It decreased the contents of inosinic acid, guanylic acid and sum of individual nucleotides (adenylic, cytidylic, uridylic, inosinic and guanylic acids) in these samples. Significant differences were also found between the various constituents of raw and cooked samples of the beef cuts.