| stimulation of lactic acid bacteria by a micrococcus isolate: evidence for multiple effects. | growth of, and rate of acid production by, six cultures of lactic acid bacteria were increased in the presence of micrococcus isolate f4 or a preparation of its capsular material. concentrations of hydrogen peroxide found in pure cultures of the lactic acid bacteria were not detectable, or were greatly reduced, in mixed culture with micrococcus isolate f4. the capsular material was not as effective as whole cells in preventing accumulation of h(2)o(2). catalase stimulated growth of, and the rate ... | 1973 | 4199337 |
| transduction of lactose metabolism in streptococcus lactis c2. | ultraviolet (uv)-induced phage lysates, from lactose-positive (lac(+)) streptococcus lactis c2, transduced lactose fermenting ability to lac(-) recipient cells of this organism. although the phage titer could not be determined due to the absence of an appropriate indicator strain, the number of transductants was proportional to the amount of phage lysate added. treatment of the lysate with deoxyribonuclease had no effect on this conversion, indicating the observed genetic change was not mediated ... | 1973 | 4199514 |
| activation of nisin production by uv-irradiation in a nisin-producing strain of streptococcus lactis. | | 1973 | 4199753 |
| proton-coupled accumulation of galactoside in streptococcus lactis 7962. | when cells of the anaerobe streptococcus lactis 7962 are deprived of their normal fermentable energy source, active transport of galactosides is completely abolished although the membrane carriers are still capable of facilitating the equilibration of sugars across the cell membrane. in these nonmetabolizing cells it was possible to test the mitchell hypothesis of obligatory coupling of proton movement with sugar transport. this hypothesis was supported by alkalinization of the medium observed w ... | 1973 | 4200725 |
| freeze-injury in bacteria. | | 1973 | 4200831 |
| the growth of mixed population of lactobacillus casei and nisin producing strain of streptococcus lactis in batch and continuous cultures. | | 1973 | 4201957 |
| [concentrated preparation of streptococcus lactis bacteriophage]. | | 1973 | 4202477 |
| growth of streptococcus cremoris and streptococcus lactis in a chemostat. production of cells and survival of bacteria during frozen storage. | | 1973 | 4202762 |
| [biosynthesis and properties of the polypeptide antibiotic nisin]. | | 1973 | 4202812 |
| carbohydrate metabolism in lactic streptococci: fate of galactose supplied in free or disaccharide form. | phosphorylation of free galactose by lactic streptococci was mediated by an adenosine triphosphate (atp)-dependent kinase. the phosphoenolpyruvate (pep) phosphotransferase system (pts) was involved to a limited extent in transport of the sugar. the conversion of free galactose to glucose also was demonstrated, and uridine diphosphogalactose-4-epimerase was demonstrated to account for this change. galactose, supplied as lactose, was phosphorylated during transport by means of the pts with pep as ... | 1973 | 4203337 |
| medium for the propagation and assay of lactic and other phages. | | 1974 | 4203723 |
| lysogenic strains of group n lactic streptococci. | a temperate bacteriophage, designated r(1)t, was inducible from the group n lactic streptococcus, streptococcus cremoris r(1), by ultraviolet irradiation or mitomycin c treatment. induced lysates produced plaques on lawns of three closely related s. cremoris strains, am(1), sk(11), and us(3). strain sk(11) was readily lysogenized. s. cremoris am(1) was the most reliable indicator strain, although the age of the culture used for seeding plates was critical. zones of lysis but no plaque formation ... | 1974 | 4203783 |
| an experimental continuous-culture unit for the production of frozen concentrated cheese starters. | | 1973 | 4203805 |
| some properties of frozen concentrated starters produced by continuous culture. | | 1973 | 4203806 |
| effect of diluent on bacterial counts in milk and milk products. | | 1974 | 4204099 |
| the microbiology of burukutu beer. | | 1973 | 4204376 |
| extrachromosomal elements in group n streptococci. | the deoxyribonucleic acid (dna) of streptococcus lactis c2, s. cremoris b(1), and s. diacetilactis 18-16 was labeled by growing cells in trypticase soy broth containing (3)h-labeled thymine. the cells were gently lysed with lysozyme, ethylenediaminetetraacetic acid, and sodium lauryl sulfate. the chromosomal dna was separated from plasmid dna by precipitation with 1.0 m sodium chloride. the existence of covalently closed circular dna in the three organisms was shown by cesium chloride-ethidium b ... | 1974 | 4205191 |
| preliminary observations on the influence of proflavin, ethidium bromide and elevated temperature on the production of the antibiotic nisin by streptococcus lactis strains. | | 1973 | 4206719 |
| contact between the mastitis laboratory and herd. | | 1974 | 4206965 |
| localization of proteinase(s) near the cell surface of streptococcus lactis. | two criteria suggest that most of the proteinase of streptococcus lactis is localized in the cell wall. (i) intact cells possess proteinase activity when incubated with a high-molecular-weight substrate. (ii) most of the cell-bound proteinase activity is released during spheroplast formation under conditions which result in the release of only 1% of the intracellular enzymes aldolase and glyceraldehyde-3-phosphate dehydrogenase. the solubilized cell wall, plasma membrane, and cytoplasm fractions ... | 1974 | 4208129 |
| proteinase activity in slow lactic acid-producing variants of streptococcus lactis. | variants of streptococcus lactis that produce lactic acid slowly in milk were isolated by inducing plasmid loss in the wild type at 39 to 40 c. such strains had lost most of their surface-bound proteinase activity and were designated prt(-). the specific proteinase activities of s. lactis c10 prt(+) whole cells and solubilized cell walls were 7 and 18 times, respectively, those of the prt(-) strain, but spheroplast lysates of prt(+) and prt(-) strains contained similar proteinase activity. s. la ... | 1974 | 4208513 |
| food preservation and antibacterial properties of four fluoroalkane compounds. | | 1974 | 4209661 |
| [the presence of malic enzyme and malo-lactic enzyme in various lactic acid bacteria (author's transl)]. | | 1974 | 4209828 |
| altered metabolism in a streptococcus lactis c2 mutant deficient in lactic dehydrogenase. | | 1974 | 4211787 |
| herd incidence of bovine mastitis in four danish dairy districts. i. the prevalence and mastitogenic effect of micro-organisms in the mammary glands of cows. | | 1974 | 4213559 |
| effect of butterfat on inhibition of staphylococcus aureus by nisin. | | 1974 | 4213720 |
| simultaneous loss of proteinase- and lactose-utilizing enzyme activities in streptococcus lactis and reversal of loss by transduction. | during studies on spontaneous loss of lactose metabolism in streptococcus lactis c2, it was found that the lactose-negative (lac(-)) mutants were also proteinase negative (prt(-)). this pleiotropic effect was observed in s. diacetilactis 18-16, but not in s. cremoris b1. the lac(-)prt(-) mutants from s. lactis c2 were able to grow in milk, but no ph change or measurable protein breakdown occurred. when the milk was supplemented with glucose, a slow decline in ph occurred. addition of a protein h ... | 1974 | 4214075 |
| pyruvate kinase of streptococcus lactis. | the kinetic properties of pyruvate kinase (atp:pyruvate-phosphotransferase, ec 2.7.1.40) from streptococcus lactis have been investigated. positive homotropic kinetics were observed with phosphoenolpyruvate and adenosine 5'-diphosphate, resulting in a sigmoid relationship between reaction velocity and substrate concentrations. this relationship was abolished with an excess of the heterotropic effector fructose-1,6-diphosphate, giving a typical michaelis-menten relationship. increasing the concen ... | 1974 | 4214503 |
| activation of lipolytic activity in streptococcus lactis by ultraviolet irradiation. | | 1974 | 4214505 |
| serum 'uracil plus uridine' levels in normal subjects and their possible significance. | a microbiological method for the assay of uracil is described. the growth of the test organism is supported by uracil and also by uridine but not by uridylic acid. the method therefore measures uracil and uridine together. the ;uracil + uridine' level, expressed as uracil, has been measured in blood from 144 normal subjects ranging in age from cord blood to the eighth decade. the mean level of 22 mu mol/l (0.25 mg%) in cord blood decreases to 15 mumol/l (0.17 mg%) in adults over the age of 20. t ... | 1974 | 4214838 |
| the effect of proflavin, ethidium bromide and an elevated temperature on the appearance of nisin-negative clones in nisin-producing strains of streptococcus lactis. | | 1974 | 4214893 |
| biological ensiling of sugarcane tops. vii. isolation and characteristics of lactic acid bacteria. | | 1974 | 4215715 |
| characterization of lac+ transductants of streptococcus lactis. | a phage-mediated transducing system was used in studying certain physiological characteristics of s. lactis c2 wild type, lactose-negative mutants, and lactose-positive transductants. lac(-) mutants, obtained by acriflavine treatment of the wild type, were similar to the wild type in all characteristics tested except they lacked beta-d-phosphogalactoside galactohydrolase (beta-pgal) and could not transport [(14)c]lactose; they also had approximately 10% of the proteolytic ability than wild-type ... | 1974 | 4216286 |
| [the relationship between the concentration of protein breakdown products in the culture media of several lactic acid streptococci and the quality of cheese produced with their use]. | | 1974 | 4217451 |
| antagonism of lactic streptococci toward staphylococcus aureus in associative milk cutures. | the inhibition of growth of staphylococcus aureus by lactic streptococci in associative cultures in milk was not due to hydrogen peroxide produced by the streptococci. dialyzed whey from the milk culture of lactic streptococci was more inhibitory than dialyzed whey from milk acidified with lactic acid, indicating that material other than lactate was also involved. analyses of cation and anion exchange fractions from the dialyzed whey showed that only the neutral fraction was inhibitory. | 1974 | 4217589 |
| effect of individual ingredients of fortified skim milk as suspending media on survival of freeze-dried cells of streptococcus lactis. | | 1974 | 4218152 |
| [aptitude of lactic streptococcus for proteolysis. ii. the action of proteolytic system of streptococcus lactis on whole casein]. | | 1974 | 4218457 |
| [study of the effect of amino acids on the biosynthesis of nisin and on the growth of streptococcus lactis using the method of mathematical planning of experiments]. | | 1973 | 4218855 |
| [bioassay of metabolic promoting factor in human saliva for acidogenic bacteria (author's transl)]. | | 1974 | 4220122 |
| repression of staphylococcus aureus in associative culture. | the growth of staphylococcus aureus mf 31 was suppressed when grown in association with streptococcus diacetilactis and other lactic streptococci. the data indicated that the initial proportion of staphylococci present in the medium was of less importance than the depletion of vital nutrients. investigation revealed that factors present in yeast nitrogen base medium could reverse the inhibition which was due to antagonism. the major factor found was nicotinamide, and further study revealed that ... | 1965 | 4222452 |
| a protonmotive force drives atp synthesis in bacteria. | when cells of streptococcus lactis or escherichia coli were suspended in a potassium-free medium, a membrane potential (negative inside) could be artificially generated by the addition of the potassium ionophore, valinomycin. in response to this inward directed protonmotive force, atp synthesis catalyzed by the membrane-bound atpase (ec 3.6.1.3) was observed. the formation of atp was not found in s. lactis that had been treated with the atpase inhibitor, n,n'-dicyclohexylcarbodiimide, nor was it ... | 1974 | 4279406 |
| purification and properties of nicotinamide adenine dinucleotide-dependent d- and l- lactate dehydrogenases in a group n streptococcus. | streptococcus lactis strain 760, a group n streptococcus, was found to possess nicotinamide adenine dinucleotide-dependent dehydrogenase activities for both the l(+) and the d(-) isomers of lactic acid. the two enzymes were isolated and purified and were found to differ with respect to ph optima, activation by fructose-1,6-diphosphate, ph and heat stability, and the temperature at which each enzyme was formed in the organism during growth. the presence of a racemase for lactic acid was not detec ... | 1972 | 4340863 |
| phosphatidyldiglucosyl diglyceride from streptococci and its relationship to other polar lipids. | | 1973 | 4353702 |
| lactose and d-galactose metabolism in group n streptococci: presence of enzymes for both the d-galactose 1-phosphate and d-tagatose 6-phosphate pathways. | group n streptococci possess enzymes for the metabolism of d-galactose through both the d-galactose 1-phosphate pathway (leloir pathway) and the d-tagatose 6-phosphate pathway. | 1974 | 4358045 |
| characterization of lactose-fermenting revertants from lactose-negative streptococcus lactis c2 mutants. | partial lactose-fermenting revertants from lactose-negative (lac(-)) mutants of streptococcus lactis c2 appeared on a lawn of lac(-) cells after 3 to 5 days of incubation at 25 c. the revertants grew slowly on lactose with a growth response similar to that for cryptic cells. in contrast to lac(+)s. lactis c2, the revertants were defective in the accumulation of [(14)c]thiomethyl-beta-d-galactoside, indicating that they were devoid of a transport system. hydrolysis of o-nitrophenyl-beta-d-galacto ... | 1974 | 4368487 |
| role of metabolic energy in the transport of -galactosides by streptococcus lactis. | streptococcus lactis (atcc 7962) accumulated thiomethyl-beta-galactoside (tmg) and other galactosides against concentration gradients when the cells were supplied with a metabolizable substrate, such as glucose. the accumulated tmg was free and not phosphorylated. in the absence of glucose, tmg rapidly entered the cell to a concentration equal to that of the medium. agents that uncouple oxidative phosphorylation abolished active transport but not the carrier-facilitated entry of tmg. evidence th ... | 1972 | 4621686 |
| stimulation of lactic streptococci in milk by -galactosidase. | acid production in milk by lactic streptococci was stimulated by added beta-galactosidase. both glucose and galactose accumulated rapidly in the presence of this enzyme. glucose accumulation ceased as the culture entered the most rapid period of acid production, whereas galactose accumulation continued. in cultures without added beta-galactosidase, a low concentration of galactose accumulated in the milk, whereas glucose was not detected after 2 hr of incubation. cultures grew and produced acid ... | 1972 | 4621795 |
| [a new therapy against the endogenous factor of periodontosis]. | | 1972 | 4623170 |
| susceptibility of cheese and yoghurt starter bacteria to antibiotics. | eight single-strain lactic streptococci, three commercial cheese starters, and six lactic acid bacteria isolated from yoghurt were examined for their susceptibility to penicillin, cloxacillin, tetracycline-hydrochloride and streptomycin. the ranges of the antibiotics causing 50% inhibition of the bacteria were (mug/ml): penicillin, 0.009 to 0.20; cloxacillin, 0.24 to 2.50; tetracycline, 0.09 to 0.60; and streptomycin, 0.35 to 13.0. the average concentrations required to cause 50 and 100% inhibit ... | 1972 | 4624215 |
| preparation of spheroplasts from streptococcus lactis. | | 1972 | 4624548 |
| the effect of thioglycolic acid or propanol pretreatment on lysing of streptococcus lactis with lysozyme and salt. | | 1972 | 4624552 |
| loss of lactose metabolism in lactic streptococci. | lactose-negative mutants occurred spontaneously in broth cultures of streptococcus lactis c(2)f. instability of lactose metabolism was noted in other strains of s. lactis, in strains of s. cremoris, and in s. diacetilactis. colonies of s. lactis c(2)f grown with lactose as the carbohydrate source also possessed lac(-) cells. treatment of lactic streptococci with the mutagen acriflavine (af) increased the number of non-lactose-fermenting variants. the effect of af on growth and on loss of lactose ... | 1972 | 4625340 |
| growth studies on the lactic streptococci. i. a laboratory apparatus suitable for fermentation studies using skim-milk medium. | | 1972 | 4625576 |
| growth studies on the lactic streptococci. ii. the effect of agitation on the growth characteristics of streptococcus lactis ml 8 in batch culture. | | 1972 | 4625577 |
| growth studies on the lactic streptococci. 3. observations on continuous growth behaviour in reconstituted skim-milk. | | 1972 | 4625578 |
| growth studies on the lactic streptococci. iv. some observations on redox potential. | | 1972 | 4625579 |
| antimicrobial properties of natural phenols and related compounds: obtusastyrene and dihydro-obtusastyrene. | factors influencing the antimicrobial properties of obtusastyrene and dihydro-obtusastyrene were studied. both of these compounds were soluble in acetone, alcohol, and olive oil. in water, they were soluble at concentrations of 34 and 53 mug/ml, respectively. the minimal inhibitory concentrations against gram-positive bacteria and yeast were below 100 mug/ml. the compounds were not effective against gram-negative bacteria at 200 mug/ml or lower concentrations. with initial populations of cells g ... | 1972 | 4625626 |
| effect of secondary metabolites on the organisms producing them: effect of nisin on streptococcus lactis and enterotoxin b on staphylococcus aureus. | the effect of secondary metabolites added to cultures of the organisms producing them was investigated. nisin was added to growing cultures of a nisin-producing strain of streptococcus lactis (354/07) and enterotoxin b to strains of staphylococcus aureus (s6 and 243) producing enterotoxin b. one quarter (12 mug/ml) of the amount of nisin formed by the culture of s. lactis inhibited lag-phase cells and lysed log-phase cells. the same amount of nisin added before inoculation or at a time when nisi ... | 1972 | 4625627 |
| [laboratory diagnosis of mastitis]. | | 1972 | 4628197 |
| [use of the graphic differentiation method for determining total and specific growth rates of lactic acid streptococci]. | | 1972 | 4628765 |
| galactoside accumulation associated with ion movements in streptococcus lactis. | | 1972 | 4629419 |
| heterofermentative carbohydrate metabolism of lactose-impaired mutants of streptococcus lactis. | two mutants of streptococcus lactis atcc 11454 have been isolated which possess an impaired lactose-fermenting capacity; galactose utilization is also affected, but to a lesser extent. although the embden-meyerhof-parnas pathway is the major, if not the sole, pathway of carbohydrate metabolism in the three strains, the fermentation end products of the mutants are dramatically different from the typical homolactic pattern of the wild type. under conditions of low oxygen tension and growth-limitin ... | 1972 | 4629656 |
| [aminogram of streptococcus lactis--producer of nisin]. | | 1972 | 4630046 |
| [structure of phosphatidyldiglucosyldiglycerides from streptococci]. | | 1972 | 4630974 |
| [dynamics of the reducing activity of lactic acid streptococci during their development in milk]. | | 1972 | 4632213 |
| effect of variations in conditions of incubation upon inhibition of staphylococcus aureus by pediococcus cerevisiae and streptococcus lactis. | the effects of ph, temperature, proportion of staphylococcus aureus in the inoculum, various strains of effector organism, and various strains of s. aureus were examined for their influence on interactions between staphylococci and effector organisms in associative culture. in general, small changes in ph had little effect upon either growth of s. aureus or production of enterotoxin in associative culture. inhibition of growth of s. aureus caused by effector organisms was much greater at 25 than ... | 1973 | 4632847 |
| lysogeny in lactic streptococci producing and not producing nisin. | eighty-seven strains of lactic streptococci (46 of streptococcus lactis, 24 of s. diacetilactis, and 17 of s. cremoris) were tested for lysogeny; 12 s. lactis strains produced nisin. lysogeny was found in five s. lactis strains (two of them were nisin producers) and in two s. diacetilactis strains. four s. lactis and two s. diacetilactis lysogens liberated phages both spontaneously and after ultraviolet treatment, and one s. lactis strain liberated phages spontaneously only. no lysogens were fou ... | 1973 | 4632856 |
| [kinetics of streptococcus lactis metabolism on initial and optimized media]. | | 1972 | 4633035 |
| -d-phosphogalactoside galactohydrolase of lactic streptococci. | beta-d-phosphogalactoside galactohydrolase (beta-pgal) was examined in a number of lactic streptococci by use of the chromogenic substrate o-nitrophenyl-beta-d-galactopyranoside-6-phosphate. specific activity of beta-pgal ranged from 0.563 units/mg of protein in streptococcus lactis un, to 0.120 in s. diacetilactics 18-16. essentially no beta-d-galactoside galactohydrolase (beta-gal) was found in these organisms when o-nitrophenyl-beta-d-galactopyranoside served as the chromogenic substrate. s. ... | 1973 | 4633424 |
| fractionation of dipeptidase activities of streptococcus lactis and dipeptidase specificity of some lactic acid bacteria. | proteins in sonic extracts of streptococcus lactis were separated by starch-gel electrophoresis at high voltage. each slab was sliced longitudinally, and half was stained for peptidases in a mixture containing a peptide, l-amino acid oxidase (snake venom), peroxidase, and o-dianisdine; the other half was stained in amido black for protein. in addition to sonic treatment, trypsin also released enzyme from acetone-treated cells. glycyl-l-phenylalanine, l-phenylalanyl-glycine, l-alanyl-l-phenylalan ... | 1973 | 4633426 |
| effect of selected lactic acid bacteria on growth of staphylococcus aureus and production of enterotoxin. | representative strains of 15 species of lactic acid bacteria were examined for their ability to influence growth of staphylococcus aureus and production of enterotoxin in associative culture. among the organisms used as effectors the streptococci were most inhibitory, followed by pediococcus cerevisiae. the lactobacilli and leuconostoc citrovorum were not inhibitory to growth and only slightly inhibitory to production of enterotoxin. enterotoxin was detected in all cultures in which the populati ... | 1973 | 4633430 |
| [biochemical characteristics of strains of lactic acid microorganisms used in cheese making]. | | 1973 | 4633826 |
| [auxogram of the lactic acid bacterium streptococcus lactis strain mgu]. | | 1973 | 4633827 |
| production of staphylococcal enterotoxin a in blue, brick, mozzarella, and swiss cheeses. | | 1973 | 4634171 |
| relationship of cellular components to the stability of concentrated lactic streptococcus cultures at -17 c. | concentrated cultures of lactic streptococci varied with respect to survival at -17 c. cells of each strain grown at ph 6.0 were more stable to freezing than were those grown statically. the lipid fraction of the cells from static cultures was important in preventing death during freezing. as the percentage of octadecenoic acid in the cellular lipids from different cultures increased, the percentage of survivors decreased. capsular material associated with cells from cultures grown both statical ... | 1974 | 4825981 |
| [studies on streptococci. ii. on the typing of lactococcus group]. | | 1963 | 4873690 |
| survival and activity of frozen starter cultures for cheese manufacture. | a study has been conducted on the effect of freezing and storage in liquid nitrogen on 13 strains of lactic streptococci. cultures were frozen in droplet form and collected in mesh bags. after rapid thawing, the activity of the frozen cultures was compared with a culture of the same organism of the age usually used in cheese-making. the activities of the test and control cultures were traced simultaneously by continuous recording of the ph changes in inoculated milks. viable counts were performe ... | 1970 | 4917192 |
| optimum growth parameters of lactic streptococci used for the production of concentrated cheese starter cultures. | | 1971 | 4939272 |
| proteinase enzyme system of lactic streptococci. i. isolation and partial characterization. | proteinase activity of streptococcus lactis cells was maximal at ph 6.0, but after storage at 3 c the minimal activity was observed at this ph. activity lost as a result of storage could be restored by adding glutathione. whole cells were fractionated into soluble (intracellular) and particulate fractions by sonic disruption; both fractions contained enzymatic activity. activity of the soluble (intracellular) fraction was found to be stable to storage at 3 c, but was inhibited progressively with ... | 1967 | 4963446 |
| quantitative ultramicroanalysis of amino acids in the form of their dns-derivatives. iv. some applications of the method. quantitative evaluation of dns-peptide maps. | | 1971 | 5002191 |
| [nature of some bitter products of developing during preparation of cheeses]. | | 1971 | 5002243 |
| the antimicrobial activity of citral. | | 1971 | 5002370 |
| a study of specificity of cores fro group d streptococci. | | 1971 | 5002808 |
| observations on the conversion of an inactive precursor protein to the antibiotic nisin. | | 1971 | 5003248 |
| influence of antibiotics or certain intestinal bacteria on orally administered candida albicans in germ-free and conventional mice. | candida albicans, administered by gastric intubation, persisted in the gastrointestinal tract of gnotobiotic mice for long periods but was eliminated within a relatively short period of time in pathogen-free mice. oxytetracycline administered by mouth had no reproducible effect on the persistence of c. albicans in the gastrointestinal tract of either germ-free or pathogen-free mice. prolonged administration of streptomycin extended the time that c. albicans could be recovered from feces of patho ... | 1971 | 5005314 |
| characterization of growth stimulants in corn steep for lactic streptococci. | the production of acid in milk cultures of lactic streptococci was stimulated by the addition of corn steep liquor. separation by ion-exchange and paper chromatography indicated the presence of four major stimulatory components in the corn steep. some variation was noted in the response of the lactic streptococci to the individual stimulatory components. the four components were further purified by paper and column chromatography. one of the four stimulatory components stained positively on chro ... | 1971 | 5107908 |
| effect of chloramphenicol on host-bacteriophage relationships in the lactic streptococci. | chloramphenicol (cm)-resistant mutants of streptococcus lactis strain ml3 were obtained either as a consequence of continuous transfer of the bacteria in broth containing increasing amounts of cm or by selecting for high-level resistant derivatives after mutagenic treatment of the bacteria. some cm-resistant cells obtained by the first method were also resistant to the homologous bacteriophage. cells trained to grow in the presence of cm developed resistance to some heterologous attacking phages ... | 1970 | 5422302 |
| mechanisms of lactose utilization by lactic acid streptococci: enzymatic and genetic analyses. | the apparent instability of beta-galactosidase in toluene-treated cells or cell-free extracts of lactic streptococci is explained by the fact that these organisms do not contain the expected enzyme. instead, various strains of streptococcus lactis, s. cremoris, and s. diacetilactis were shown to hydrolyze o-nitrophenyl-beta-d-galactoside-6-phosphate (onpg-6-p), indicating the presence of a different enzyme. in addition, lactose metabolism in s. lactis c(2)f was found to involve enzyme i (ei), en ... | 1970 | 5429725 |
| effect of storage at 3 c on the proteinase enzyme systems of slow and fast strains of lactic streptococci. | | 1970 | 5469731 |
| characterization of growth stimulants in corn steep for lactic streptococci. | | 1971 | 5544292 |
| proteinase enzyme system of lactic streptococci. 3. substrate specificity of streptococcus lactis intracellular proteinase. | the substrate specificity of an intracellular proteinase from streptococcus lactis was investigated in an effort to understand the role of the enzyme in the cell. peptides in which the n-terminal residue was glycine were not hydrolyzed by the enzyme (exceptions were glycyl-alanine, glycyl-aspartic acid, and glycyl-asparagine), but the peptide was hydrolyzed if the n-terminal residue was alanine. the enzyme also showed activity toward peptides containing aspartic acid or asparagine. hydrolysis of ... | 1968 | 5636816 |
| d-leucine as an auto-inhibitor of lactic streptococci. | | 1968 | 5682479 |
| growth stimulation of lactobacillus species by lactic streptococci. | cell extracts of streptococcus species important in cheese starters stimulated the growth of lactobacillus species common to cheddar cheese. all lactobacillus strains employed, with the exception of a strain of l. casei, were significantly stimulated by a strain of s. diacetilactis. l. casei was highly stimulated by both a strain of s. lactis and a strain of s. diacetilactis. the stimulant(s) was dialyzable and was partially inactivated by heat. the stimulatory principle was active at 10 c, indi ... | 1969 | 5775912 |
| ultra-low temperature storage of lactic streptococci. | | 1965 | 5898730 |
| activity of lactic streptococci following storage at refrigeration temperatures. | | 1965 | 5898796 |
| lactic streptococcal phage-associated lysin. i. lysis of heterologous lactic streptococci by a phage-induced lysin. | | 1966 | 5906153 |
| acetaldehyde production by single-strain lactic streptococci. | | 1966 | 5952148 |
| effects of additives on the survival of lactic streptococci in frozen storage. | three single-strain cultures, streptococcus lactis c(2), s. cremoris r(1), and s. diacetilactis drc(2), were frozen and stored in skim milk, in skim milk containing apple juice, and in skim milk containing one of the following additives: glycerol (10%, v/v), dimethyl sulfoxide (10%, v/v), l-malic acid (0.5 and 2.0%, w/v), acetamide (0.5 and 2.0%, w/v), or succinimide (0.5 and 2.0%, w/v). cultures were frozen and stored at -23.3 c, frozen and stored at -196 c in liquid nitrogen, or frozen at -196 ... | 1966 | 5953603 |
| storage of lactic streptococci. i. effect of ph on survival and endogenous metabolism in phosphate buffer. | | 1966 | 5959735 |
| long-term storage of bacteriophages of lactic streptococci. | four phage strains representing phages of streptococcus lactis, s. cremoris, and s. diacetilactis were selected for the observation of the effect of cold storage on their viability. phages were stored at 4 c and at -18 c, or were frozen at approximately -70 c and stored at -18 c. they were found to display a high degree of stability with these storage methods. the same phage strains showed good stability to storage at room temperature for 3 weeks after thawing and also to alternate freezing and ... | 1966 | 5970828 |