scholarly journals Chemical preservatives in foodstuffs VI. The effect of silver ions on microbes, in particular on the flora of fresh fish

1966 ◽  
Vol 38 (4) ◽  
pp. 198-209
Author(s):  
Olavi E. Nikkilä ◽  
Alpo Siiriä ◽  
Jorma J. Laine
Keyword(s):  
Aqueous Solution ◽  
Silver Ions ◽  
Mixed Cultures ◽  
Fresh Fish ◽  
Baltic Herring ◽  
Pure Cultures ◽  
Chemical Preservatives

A study has been made of the effect of silver ions upon microbes in water, in rinsing and washing experiments, and in the storage of fresh Baltic herring in ice containing silver ions. It was observed that silver ions were microbicidic in all experiments except in those with stored fish. Even in this case, silver ions were effective in killing bacteria when they were isolated and kept in an aqueous solution. In all the experiments the pure cultures were less resistant than the natural mixed cultures.

scholarly journals Chemical preservatives in foodstuffs IV. Prolongation of the keeping guality of fresh fish by antibiotics

1961 ◽  
Vol 33 (1) ◽  
pp. 111-122
Author(s):  
Reino R. Linko ◽  
Olavi E. Nikkilä ◽  
Jorma J. Laine
Keyword(s):  
Early Phase ◽  
Favorable Effect ◽  
Fresh Fish ◽  
Baltic Herring ◽  
Keeping Quality ◽  
Chemical Preservatives ◽  
And Storage

A study has been made of the effect of antibiotics in the storage of fresh Baltic herring. Experiments were made with muscle homogenates, to which antibiotics were added, and whole fish and fillets, treated by means of dips in antibiotic solutions and storage in antibiotic ice. The temperatures studied were 2°C and 10°C. The antibiotics employed were chlortetracycline and oxytetracycline. It was observed that the antibiotics improved the keeping quality of Baltic herring. In dipping treatments, and in experiments with muscle homogenates, the favorable effect of the antibiotic was observable even at the early phase of the storage, whereas when antibiotic ice was used such effect was only discovered after about one week’s storage. In a comparison of chlortetracycline and oxytetracycline no essential differences were observed in their effectivity.

Sorption and desorption studies on silver ions from aqueous solution by coconut fiber

2017 ◽  
Vol 149 ◽  
pp. 290-301 ◽  
Author(s):  
Paweł Staroń ◽  
Jarosław Chwastowski ◽  
Marcin Banach
Keyword(s):  
Aqueous Solution ◽  
Silver Ions ◽  
Coconut Fiber

In Vitro Inhibition of the Growth of Salmonella typhimurium and Escherichia coli 0157:H7 by Bacteria Isolated from the Cecal Contents of Adult Chickens

1991 ◽  
Vol 54 (7) ◽  
pp. 496-501 ◽  
Author(s):  
ARTHUR HINTON ◽  
GEORGE E. SPATES ◽  
DONALD E. CORRIER ◽  
MICHAEL E. HUME ◽  
JOHN R. DELOACH ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Lactic Acid ◽  
Salmonella Typhimurium ◽  
Mixed Cultures ◽  
Enterococcus Durans ◽  
E Coli ◽  
Pure Cultures ◽  
In Vitro Inhibition ◽  
Lactic Acids

A Veillonella species and Enterococcus durans were isolated from the cecal contents of adult broilers. Mixed cultures of Veillonella and E. durans inhibited the growth of Salmonella typhimurium and Escherichia coli 0157:H7 on media containing 2.5% lactose (w/v). The growth of S. typhimurium or E. coli 0157:H7 was not inhibited by mixed cultures containing Veillonella and E. durans on media containing only 0.25% lactose or by pure cultures of Veillonella or E. durans on media containing either 0.25% or 2.5% lactose. The mixed cultures of Veillonella and E. durans produced significantly (P<0.05) more acetic, propionic, and lactic acids in media containing 2.5% lactose than in media containing 0.25% lactose. The inhibition of the enteropathogens was related to the production of lactic acid from lactose by the E. durans and the production of acetic and propionic acids from lactic acid by the Veillonella.

Thiol-modified magnetic polypyrrole nanocomposite: An effective adsorbent for the adsorption of silver ions from aqueous solution and subsequent water disinfection by silver-laden nanocomposite

2019 ◽  
Vol 360 ◽  
pp. 423-434 ◽  
Author(s):  
Thembisile Mahlangu ◽  
Raghunath Das ◽  
Luther King Abia ◽  
Maurice Onyango ◽  
Suprakas Sinha Ray ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Silver Ions ◽  
Water Disinfection

N2O producing capability of nitrosomonas europaea, nitrobacter winogradskyi and alcaligenes faecalis

1997 ◽  
Vol 36 (10) ◽  
pp. 65-72 ◽  
Author(s):  
Yuhei Inamori ◽  
Xiao-Lei Wu ◽  
Motoyuki Mizuochi
Keyword(s):  
Nitrosomonas Europaea ◽  
Alcaligenes Faecalis ◽  
N2o Emission ◽  
Mixed Cultures ◽  
Ammonia Oxidizer ◽  
Experimental Conditions ◽  
N2o Production ◽  
Pure Cultures ◽  
Pva Gel ◽  
Different Cultures

Nitrosomonas europaea, Nitrobacter winogradskyi and Alcaligenes faecalis—typical ammonia-oxidizer, nitrite-oxidizer and heterotrophic nitrifier were immobilized in PVA gel and employed in the study. Continuous experiments were conducted in their pure and mixed cultures with DO concentrations in the cultures kept at 4, 2, 0.5 mg·l−1. Comparisons among N2O emission from different cultures were made to show their N2O producing capabilities. Results showed that: compared with N. europaea and A. faecalis, N. winogradskyi produced negligible N2O. On the other hand, N. europaea had the highest N2O producing ability. Unit N. europaea produced N2O 18–53 times higher than unit A. faecalis did. However, due to the higher population of A. faecalis, N2O production of the A. faecalis culture was higher than that of the N. europaea culture when DO concentration in the cultures was 2 mg·l−1; whereas, N2O yields of the A. faecalis culture were smaller than those of the N. europaea culture at DO concentrations of 4 and 0.5 mg·l−1. N2O emitted from most the mixed cultures was lower than that from pure cultures under the experimental conditions.

Colloidal copper and peculiarities of its reaction with silver ions in aqueous solution

2009 ◽  
Vol 71 (4) ◽  
pp. 487-492 ◽  
Author(s):  
B. G. Ershov ◽  
E. V. Abkhalimov
Keyword(s):  
Aqueous Solution ◽  
Silver Ions

Bioleaching of Low-Grade Copper Sulfide Ore Using a Colum Reactor

2009 ◽  
Vol 71-73 ◽  
pp. 409-412
Author(s):  
Wen Qing Qin ◽  
Yan Sheng Zhang ◽  
Shi Jie Zhen ◽  
Jun Wang ◽  
Jian Wen Zhang ◽  
...  
Keyword(s):  
Iron Concentration ◽  
Mixed Cultures ◽  
Copper Recovery ◽  
Low Grade ◽  
Leaching Rate ◽  
Ministry Of Education ◽  
Copper Ore ◽  
Copper Leaching ◽  
Pure Cultures ◽  
Mixed Bacteria

The effects of several variables on the column bioleaching of copper sulphide ore have been investigated. The copper ore contained chalcopyrite as the main sulfide minerals and bornite and chalcocite as the minor minerals. The experiment was carried out using bench-scale column leach reactors designed in Key Lab of Biometallurgy of Ministry of Education, which were inoculated with the pure mesophile bacteria (Acidithiobacillus ferrooxidans) and thermophile bacteria (Sulfobacillus), respectively, and the mixed bacteria which contain both iron- and sulfur-oxidizing bacteria. The results show that the mixed cultures were more efficient than the pure cultures alone and the maximum copper recovery 53.64% was achieved using the mixed cultures after 85 days. The leaching rate of chalcopyrite tended to increase with the increased dissolved ferric iron concentration. The effect of particle size on the rate of the copper leaching was also investigated, and it was shown that the copper bioleaching rate decreases as the amount of fines increase, which limits the permeability, thus decreases leaching rate. Jarosite and elemental sulphur formed in the column were characterized by the X-ray and EDS.

Studies in intermicrobial symbiosis. Saccharomyces cerevisiae and Lactobacillus casei

1972 ◽  
Vol 18 (11) ◽  
pp. 1733-1742 ◽  
Author(s):  
R. D. Megee III ◽  
J. F. Drake ◽  
A. G. Fredrickson ◽  
H. M. Tsuchiya
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Continuous Culture ◽  
Mixed Culture ◽  
Growth Medium ◽  
Lactobacillus Casei ◽  
Mixed Cultures ◽  
Genetic Characteristics ◽  
Culture Techniques ◽  
Pure Cultures

Saccharomyces cerevisiae and a riboflavin assay strain of Lactobacillus casei have been propagated anaerobically in mixed culture. Both batch and continuous culture techniques were used. By varying the concentrations of glucose and riboflavin in the growth medium, it was possible to produce symbioses of commensalism + competition, competition, and mutualism + competition. In short, the interaction prevailing is determined by the medium as well as by the genetic characteristics of the organisms. The behavior of the mixed cultures in these situations was predicted from data taken on pure cultures of the organisms.

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