Showing papers by "John F. Kennedy published in 1994"
145 citations
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TL;DR: The DNA sequence coding for the merozoite protein gp195 was inserted into the vaccinia virus expression plasmid pvHAX31 by homologous recombination, and the possibility of using gp195 as a component in a multivalent malaria vaccine is discussed.
6 citations
TL;DR: In this paper, both aerobic and anaerobic oxidation of L-ascorbic acid occur in freshly-produced commercial orange juice in aseptically-filled TetraBrik cartons.
Abstract: It has been demonstrated that both aerobic and anaerobic oxidation of L-ascorbic acid occur in freshly-produced commercial orange juice in aseptically-filled TetraBrik cartons. The aerobic oxidation proceeds during the initial stage of the degradation process at a rate which is dependent on the L-ascorbic acid concentration, dissolved oxygen level and temperature. However, when the oxygen level reaches equilibrium, an anaerobic process follows at a much slower rate.Comparative studies on food additives, such as sodium metabisulphite, sodium tripolyphosphate, D-sorbitol and carboxymethyl cellulose, which may be used for extending the shelf-life of citrus juices, showed sodium metabisulphite to be the most effective. However, use of L-ascorbic acid derivatives is recommended.
6 citations
5 citations
5 citations
01 Jan 1994
TL;DR: A study of the effectiveness of chitosan as a coagulant for removing proteins from whey elucidated the conditions at which chitosa operates most efficiently, such as optimum dosage, pH of reaction, time of mixing and sedimentation rates.
Abstract: In recent years the attitude towards whey proteins has changed and they are no longer considered as waste products, but rather as valuable nutrients that can be used in the food industry. A study of the effectiveness of chitosan as a coagulant for removing proteins from whey elucidated the conditions at which chitosan operates most efficiently. Such factors as optimum dosage, pH of reaction, time of mixing and sedimentation rates were studied. The highest recovery of proteins from whey was ca. 40%, estimated by amino acid analysis.
TL;DR: Physicochemical characterization of this immobilized biocatalyst focused especially on attributes such as the immobilization isotherms (Langmuir type) of the enzyme to the support, the stability of the catalytic activity, the effects of pH and temperature on this activity and the existence of limitations of external diffusion for H+, substrate and/or products.
TL;DR: A mechanism for the catalytic kinetic action has been postulated in the absence of diffusional constraints and a minimum rational rate equation of 2:2 degree in substrate concentration is postulated.
TL;DR: By a simple oversight, an immobilisation membrane was inserted into the holding apparatus without removal of the transit packing foam, and this foam was ultimately proved to be as effective a immobilisation agent as the real membrane.
Abstract: By a simple oversight, an immobilisation membrane was inserted into the holding apparatus without removal of the transit packing foam. This foam was ultimately proved to be as effective an immobilisation agent as the real membrane.