Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| the morphology and cytology of myxococcus xanthus, n. sp. | 1941 | 16560449 | |
| [studies on the nutrition of various myxobacteria]. | 1953 | 13159244 | |
| [further studies on myxobacteria]. | 1953 | 13159251 | |
| lysis of human pathogenic bacteria by myxobacteria. | 1955 | 13235825 | |
| [myxobacillus accepted as nitrifying bacteria]. | 1955 | 14383367 | |
| substrates for myxococcus virescens with special reference to eubacterial fractions. | 1956 | 13319634 | |
| decomposition of xylan by sporocytophaga myxococcoides. | 1956 | 13321979 | |
| the nuclear cycle of myxococcus fulvus. | 1957 | 13406220 | |
| [studies on nutrition and fruit body formation in myxobacteria]. | 1957 | 13522162 | |
| the cell wall of myxococcus xanthus. | 1958 | 13560439 | |
| lysis of myxococcus xanthus. | 1958 | 13575754 | |
| [studies on cellulose catabolism by myxobacteria]. | 1959 | 14412492 | |
| [isolation and purification of aerobic cellulolytic soil bacteria. ii. isolation and description of a new arthrobacter species associated with sporocytophaga myxococcoides]. | 1961 | 14492583 | |
| microcyst of myxococcus xanthus. chemical composition of the wall. | 1961 | 13681547 | |
| association of a steroid and a pigment with a diffusible fruiting factor in myxococcus virescens. | 1961 | 13789858 | |
| the formation and germination of microcysts in myxococcus xanthus. | 1962 | 13888809 | |
| nutritional requirements for vegetative growth of myxococcus xanthus. | dworkin, martin (indiana university medical center, indianapolis, ind.). nutritional requirements for vegetative growth of myxococcus xanthus. j. bacteriol. 84:250-257. 1962.-this investigation was part of a program to clarify the environmental regulation of fruiting-body formation in a fruiting myxobacterium. by use of a dispersed-growing strain of myxococcus xanthus, the nutritional requirements for vegetative growth have been defined. exponential growth will take place on a medium containing ... | 1962 | 13888810 |
| developmental biology of myxococcus. | mcvittie, anne (cornell university, ithaca, n.y.), frances messik, and stanley a. zahler. developmental biology of myxococcus. j. bacteriol. 84:546-551. 1962.-methods for the growth and enumeration of strain fb of myxococcus xanthus were investigated. several mutants unable to form fruiting bodies were isolated. these fell into at least two classes. members of each class acted synergistically with members of other classes to form fruiting bodies; intraclass synergism did not occur. mechanisms fo ... | 1962 | 13932286 |
| fine structure of myxococcus xanthus during morphogenesis. | voelz, herbert (indiana university medical center, indianapolis) and martin dworkin. fine structure of myxococcus xanthus during morphogenesis. j. bacteriol. 84:943-952. 1962.-this investigation concerns the nature of the structural changes in myxococcus xanthus during cellular morphogenesis. these changes have been investigated by means of electromicrographs of thin sections of cells taken during various stages of the life cycle. the conversion of vegetative cells to microcysts involves the for ... | 1962 | 13997609 |
| antibiotic activity of myxobacteria in relation to their bacteriolytic capacity. | norén, börge (university of wisconsin, madison) and kenneth b. raper. antibiotic activity of myxobacteria in relation to their bacteriolytic capacity. j. bacteriol. 84:157-162. 1962-myxococcus virescens, m. fulvus, m. stipitatus, m. lacteus, chondrococcus blasticus, and chondromyces crocatus were tested for antibacterial activity, and all were found to secrete products that inhibited the growth of gram-positive eubacteria. the amount of inhibition varied with the myxobacterium employed and with ... | 1962 | 14480333 |
| nutritional regu.ation of morphogenesis in myxococcus xanthus. | dworkin, martin (university of minnesota, minneapolis). nutritional regulation of morphogenesis in myxococcus xanthus. j. bacteriol. 86:67-72. 1963.-fruiting-body formation by myxococcus xanthus can be induced by omitting phenylalanine and tryptophan from the chemically defined growth medium. this effect was specific for these two amino acids and was not attributable to a nonspecific lowering of the growth rate. a complex pool of amino acids is present in vegetative cells of m. xanthus. nutritio ... | 1963 | 14051824 |
| control of growth and morphogenesis in some myxococcus species. | 1963 | 14098465 | |
| [studies on myxococcus xanthus. ii. partial lysis of pullularia pullulans and some true yeasts by an extracellular enzyme system]. | 1963 | 13967334 | |
| electron transport system in vegetative cells and microcysts of myxococcus xanthus. | dworkin, martin (university of minnesota, minneapolis), and donald j. niederpruem. electron transport system in vegetative cells and microcysts of myxococcus xanthus. j. bacteriol. 87:316-322. 1964.-respiration by intact cells of the fruiting myxobacterium myxococcus xanthus is cyanide-sensitive and can be demonstrated in the vegetative cells but not in the microcysts. cell-free particles from both vegetative cells and microcysts have cyanide-sensitive reduced nicotinamide adenine dinucleotide ( ... | 1964 | 14151050 |
| a system for studying microbial morphogenesis: rapid formation of microcysts in myxococcus xanthus. | a method has been found for inducing the rapid, quantitative, and relatively synchronous conversion of vegetative rods of a fruiting myxobacterium to microcysts. the conversion is induced by the addition of 0.5m glycerol to a dispersed, growing, liquid culture of myxococcus xanthus. the vegetative rods are converted to microcysts in about 120 minutes. | 1964 | 14185314 |
| fruiting body populations of myxococcus fulvus (myxobacterales). | 1965 | 14324921 | |
| formation and structure of mesosomes in myxococcus xanthus. | 1965 | 14347924 | |
| action spectrum for the photolysis of myxococcus xanthus. | 1966 | 5894228 | |
| induction of cellular morphogenesis in myxococcus xanthus. i. general description. | dworkin, martin (university of minnesota, minneapolis), and william sadler. induction of cellular morphogenesis in myxococcus xanthus. i. general description. j. bacteriol. 91:1516-1519. 1966.-the details of a process for converting vegetative rods of myxococcus xanthus to microcysts rapidly (120 min), quantitatively, and synchronously are presented. the conversion is induced by 0.5 m glycerol. on the basis of a number of morphological and physiological parameters, the microcysts thus produced a ... | 1966 | 5929775 |
| induction of cellular morphogenesis in myxococcus xanthus. ii. macromolecular synthesis and mechanism of inducer action. | sadler, william (university of minnesota, minneapolis), and martin dworkin. induction of cellular morphogenesis in myxococcus xanthus. ii. macromolecular synthesis and mechanism of inducer action. j. bacteriol. 91:1520-1525. 1966.-net changes in ribonucleic acid (rna), deoxyribonucleic acid (dna), and protein syntheses in cells of myxococcus xanthus during induced, synchronous conversion to microcysts are described. the net synthesis of all three macromolecules was temporarily halted for a brief ... | 1966 | 5929776 |
| light-induced lysis and carotenogenesis in myxococcus xanthus. | burchard, robert p. (university of minnesota, minneapolis), and martin dworkin. light-induced lysis and carotenogenesis in myxococcus xanthus. j. bacteriol. 91:535-545. 1966.-myxococcus xanthus, grown vegetatively in the light, developed an orange carotenoid after the cells entered stationary phase of growth; pigment content increased with age. cells grown in the dark did not develop carotenoid and could be photolysed by relatively low-intensity light only during stationary phase; rate of photol ... | 1966 | 5935340 |
| a bacteriophage for myxococcus xanthus: isolation, characterization and relation of infectivity to host morphogenesis. | burchard, robert p. (university of minnesota, minneapolis), and m. dworkin. a bacteriophage for myxococcus xanthus: isolation, characterization and relation of infectivity to host morphogenesis. j. bacteriol. 91:1305-1313. 1966.-a bacteriophage (mx-1) infecting myxococcus xanthus fb(t) has been isolated from cow dung. the bacteriophage particle is approximately 175 mmu long. a tail about 100 mmu in length is encased in a contractile sheath and terminates in a tail plate. the head is polyhedral w ... | 1966 | 5948779 |
| lytic enzyme produced by myxococcus xanthus. | hart, beth a. (cornell university, ithaca, n.y.), and stanley a. zahler. lytic enzyme produced by myxococcus xanthus. j. bacteriol. 92:1632-1637. 1966.-strain fba of myxococcus xanthus releases into its culture medium an enzyme capable of lysing micrococcus lysodeikticus cells and of releasing n-acetyl amino sugars from their cell walls. the lysin is stable at ph values near neutrality and at temperatures below 50 c. it lyses a number of bacterial species sensitive to egg-white lysozyme, and fai ... | 1966 | 5958103 |
| the "polyphosphate overplus" phenomenon in myxococcus xanthus and its influence on the architecture of the cell. | 1966 | 5989427 | |
| the fate of the cell envelopes of myxococcus xanthus during microcyst germination. | 1966 | 5990745 | |
| deoxyribonucleic acid synthesis during exponential growth and microcyst formation in myxococcus xanthus. | myxococcus xanthus in exponential phase with a generation time of 270 min contained a period of 50 min during which deoxyribonucleic acid (dna) synthesis did not take place. after induction of microcysts by the glycerol technique, the dna content increased 19%. autoradiographic experiments demonstrated that the dna made after glycerol induction was not evenly distributed among the microcysts. the distribution of grains per microcyst fits the following model of chromosome replication: in exponent ... | 1967 | 6032514 |
| ribonucleic acid synthesis during morphogenesis in myxococcus xanthus. | ribonucleic acid synthesis was measured during the morphogenesis of myxococcus xanthus. after induction of microcyst formation by the addition of glycerol to an exponential culture, net ribonucleic acid (rna) synthesis was immediately terminated (measured either chemically or by the accumulation of acid-insoluble radioactivity). extensive rna turnover did take place, however, including rna made both before and after induction. sucrose gradient centrifugation revealed that ribosomes and ribosomal ... | 1967 | 6074398 |
| a unique structure in microcysts of myxococcus xanthus. | 1967 | 4873038 | |
| the physical organization of the cytoplasm in myxococcus zanthus and the fine structure of its components. | 1967 | 5601021 | |
| comparative study of ribosomal ribonucleic acid cistrons in enterobacteria and myxobacteria. | deoxyribonucleic acid (dna)-ribonucleic acid (rna) hybrids are formed by escherichia coli 16s or 23s ribosomal rna or pulse-labeled rna with the dna of various species of the enterobacteriaceae. the relative extent of hybrid formation is always greater for ribosomal rna. these dna-rna hybrids have been further characterized by their stability to increasing temperature, and, in every case, the stability of pulse-labeled rna hybrids was lower than that of the corresponding ribosomal rna hybrids, a ... | 1967 | 4860906 |
| nutrition of myxococcus xanthus fba and some of its auxotrophic mutants. | a defined medium containing 15 amino acids plus salts was used to study the nutrition of myxococcus xanthus fba. the amino acids phenylalanine, leucine, isoleucine, valine, and methionine were essential for growth, whereas glycine, proline, asparagine, alanine, lysine, and threonine stimulated growth. an unusual pattern of requirement was found in the aromatic amino acids. phenylalanine was essential and served as the precursor of tyrosine. growth in the absence of tryptophan was adaptive, with ... | 1968 | 4868349 |
| cytochemistry of phosphatases in myxococcus xanthus. | an mg(2+)-dependent and a k(+)-stimulated adenosine triphosphatase were localized by cytochemistry at or near both surfaces of the cytoplasmic membrane of myxococcus xanthus. an alkaline and an acid phosphatase resided at the external surface of the membrane or in the periplasm. all enzymes could be extracted from partially fixed cells with mg(2+)-deficient buffers. suboptimal external phosphate elicited dissociation of adenosine triphosphatase from the membrane but not that of the unspecific ph ... | 1968 | 4234839 |
| comparative intermediary metabolism of vegetative cells and microcysts of myxococcus xanthus. | crude extracts of both vegetative cells and glycerol-induced microcysts of myxococcus xanthus contained the following enzyme activities: phosphofructokinase, phosphoglucoisomerase, fructose-1,6-diphosphatase, fructosediphosphate aldolase, glyceraldehyde-3-phosphate dehydrogenase, phosphopyruvate carboxylase, citrate synthase, isocitrate dehydrogenase, alpha-ketoglutarate dehydrogenase, succinate dehydrogenase, malate dehydrogenase, glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogen ... | 1968 | 4302296 |
| nutritional induction and suppression of fruiting in myxococcus xanthus fba. | a defined agar medium (a agar) containing 15 amino acids in concentrations between 0.5 and 2 mm was developed for studying the fruiting cycle of myxococcus xanthus fba. cells grew only vegetatively in this medium unless the initial concentration of one of nine required or stimulatory amino acids was lowered about 50-fold. in the latter circumstance, fruiting bodies developed after several days of vegetative growth. the conclusion was that fruiting occurred when any amino acid required for normal ... | 1968 | 5643044 |
| peptidoglycan of myxococcus xanthus: structure and relation to morphogenesis. | the chemical nature and distribution of the peptidoglycan in myxococcus xanthus at various stages of the cellular life cycle were investigated. vegetative cells and microcysts contained approximately 0.6% by weight of peptidoglycan. the overall composition of the peptidoglycan was similar in both cell types and was approximately 1 glutamic acid, 1 diaminopimelic acid, 1.7 alanine, 0.75 n-acetylglucosamine, and 0.75 n-acetylmuramic acid. (we have assumed that all the hexosamines are n-acetylated. ... | 1968 | 5669896 |
| microcyst germination in myxococcus xanthus. | germination of glycerol-prepared microcysts of myxococcus xanthus was studied. the sequence of morphological events during germination resembled that of germinating fruiting body-microcysts. the turbidity drop of a culture of germinating microcysts could be described by mccormick's formula derived for germinating bacillus spores. the rate of uptake of labeled glycine and acetate did not change during germination. temperature, aeration, and ph optima for germination were the same as for vegetativ ... | 1968 | 5669898 |
| deoxyribonucleic acid synthesis during microcyst germination in myxococcus xanthus. | deoxyribonucleic acid (dna) synthesis was measured during microcyst germination in myxococcus xanthus by radioactive thymidine incorporation, autoradiography, and chemical analysis. microcysts contained an average of 6.6 conserved units of dna, corresponding to 3 to 4 chromosomes per cell. correlation of the dna content and chromosome number of microcysts indicated that the molecular weight of the nonreplicating m. xanthus chromosome is 4.9 x 10(9) daltons. dna synthesis was initiated 3.5 to 4 h ... | 1968 | 5686021 |
| deoxyribonucleic acid homology in bacterial taxonomy: effect of incubation temperature on reaction specificity. | parameters affecting deoxyribonucleic acid duplex (dna-dna) formation on membrane filters were evaluated. the reference strains used were cytophaga succinicans strain 8, which has a guanine plus cytosine (gc) content of 38%, and myxococcus xanthus strain fb, which has a gc content of 70%. both organisms are gliding bacteria classified among the myxobacteria. among the parameters evaluated, the incubation temperature used during duplex formation was found to be the most important in terms of the ... | 1968 | 4966832 |
| structural changes in stigmatella aurantiaca during myxospore induction. | suspension cultures of stigmatella aurantiaca (chondromyces aurantiacus) were induced to form myxospores by addition of glycerol to the growing culture. the cells were fixed at various stages during conversion, thin sections were prepared, and changes in fine structure were studied. vegetative cells are quite similar in their ultrastructure to myxococcus xanthus. during transformation into myxospores, three important cytological changes were observed. granules of storage material, probably polys ... | 1969 | 5773035 |
| action spectrum for carotenogenesis in myxococcus xanthus. | an action spectrum was measured for photoinduction of colored carotenoids in dark-grown, early stationary-phase cells of myxococcus xanthus. maximum activity was observed at 405 to 410 nm with subsidiary maxima at 512, 533, 548, 585, and 635 nm. these maxima correspond closely in position and magnitude with absorption maxima of protoporphyrin ix, which had previously been isolated from m. xanthus cells and had been shown to increase during the stationary phase of the culture. late stationary-pha ... | 1969 | 5776523 |
| deoxyribonucleic acid homology among the fruiting myxobacteria. | deoxyribonucleic acid similarities were determined by competition experiments. the several strains of fruiting myxobacteria tested showed from 23 to 89% homology with the reference strains myxococcus xanthus (fb) and m. fulvus (m6). | 1969 | 5781583 |
| resistance of vegetative cells and microcysts of myxococcus xanthus. | the resistance of vegetative cells and of microcysts of myxococcus xanthus to several destructive agents was compared. fruiting-body microcysts were 300 times more resistant to 60 c, 5.4 times more resistant to ultraviolet light, and 19.3 times more resistant to sonic vibration than were vegetative cells. whereas resistance to sonic vibration developed during the conversion of rods to refractile spheres, resistance to heat did not appear until after the conversion was complete. both vegetative c ... | 1969 | 5788715 |
| gliding motility mutants of myxococcus xanthus. | two gliding motility mutants of myxococcus xanthus are described. the semimotile mutant (sm) originated by high-frequency segregation from the motile fb(t) strain. segregation was enhanced by acridine dye treatment. sm cells glide only when apposed to other cells in a swarm. the nonmotile strain (nm) originated by mutation from sm. nm cells neither glide individually nor cooperatively. fb(t), sm, and nm are indistinguishable with respect to fine structure, vegetative growth rate, glycerol-induce ... | 1970 | 4923078 |
| stable messenger ribonucleic acid and germination of myxococcus xanthus microcysts. | we have examined germination, protein synthesis and ribonucleic acid (rna) synthesis by microcysts of the fruiting myxobacterium myxococcus xanthus. the morphological aspects of microcyst formation were completed at about 2 hr after induction had begun. in such microcysts, germination, rna synthesis, and protein synthesis were inhibited by actinomycin d (act d). at 6 hr after induction, germination and protein synthesis had become relatively resistant to act d, whereas rna synthesis was inhibite ... | 1970 | 5413824 |
| dna cycle of myxococcus xanthus. | 1970 | 5453346 | |
| ribonucleic acid synthesis during microcyst formation in myxococcus xanthus: characterization by deoxyribonucleic acid-ribonucleic acid hybridization. | the technique of deoxyribonucleic acid-ribonucleic acid (rna) hybridization was used to compare the rna synthesized during vegetative growth and microcyst formation in myxococcus xanthus. all classes of rna, including ribosomal rna, were synthesized during microcyst formation. the results indicate that the ribosomal rna synthesized during microcyst formation was indistinguishable from that made during vegetative growth. hybridization competition experiments demonstrated that certain messenger rn ... | 1970 | 5473896 |
| potassium uptake during microcyst formation in myxococcus xanthus. | the kinetics of (42)k uptake by myxococcus xanthus during vegetative growth and microcyst formation were determined. in the medium studied, growing cells concentrated potassium about 100-fold, yielding an intracellular concentration of 147 mm. the influx of k(+) in growing cells was 17 +/- 3 pmoles of k(+)/cm(2) min. about 5 hr after induction of vegetative cells to microcysts, the k(+) influx decreased and the intracellular concentration fell. by 18 hr after induction, there was no measurable i ... | 1970 | 5473918 |
| induction of morphogenesis by methionine starvation in myxococcus xanthus: polyamine control. | the induction of mycrocyst formation by methionine starvation was demonstrated in myxococcus xanthus by several methods. growing in a defined medium (m(1)), m. xanthus had a doubling time of 6.5 hr. four amino acids-leucine, isoleucine, valine, and glycine-were required for growth under these conditions. when the concentration of several amino acids in the medium was reduced (m(2)), the doubling time increased to 10 to 12 hr, and a requirement for methionine was observed. methionine starvation l ... | 1970 | 4097531 |
| fine structure of bacteriophage-infected myxococcus xanthus. 1. the lytic cycle in vegetative cells. | 1971 | 5543277 | |
| increase in glyoxylate shunt enzymes during cellular morphogenesis in myxococcus xanthus. | 1971 | 5548316 | |
| division cycle of myxococcus xanthus. ii. kinetics of stable and unstable ribonucleic acid synthesis. | the kinetics of stable and unstable ribonucleic acid (rna) synthesis during the division cycle of myxococcus xanthus growing in a defined medium was determined. under these conditions, m. xanthus contains one chromosome which is replicated during 80% of the cell cycle. stable rna synthesis was measured by pulselabeling an exponential-phase culture with radioactive uridine and then preparing the cells for quantitative autoradiography. by measuring the size of individual cells as well as the numbe ... | 1971 | 5555557 |
| division cycle of myxococcus xanthus. 3. kinetics of cell growth and protein synthesis. | the kinetics of cell growth and protein synthesis during the division cycle of myxococcus xanthus was determined. the distribution of cell size for both septated and nonseptated bacteria was obtained by direct measurement of the lengths of 8,000 cells. the collins-richmond equation was modified to consider bacterial growth in two phases: growth and division. from the derived equation, the growth rate of individual cells was computed as a function of size. nondividing cells (growth phase) compris ... | 1971 | 4926683 |
| the identification of 3-o-methyl-d-xylose and 3-o-methyl-l-xylose as constituents of the lipopolysaccharides of myxococcus fulvus and rhodopseudomonas viridis, respectively. | 1971 | 5138643 | |
| [lytic action of myxococcus xanthus beebe on various phytopathogenic bacteria]. | 1971 | 5290797 | |
| changes in activity of glyoxylate cycle enzymes during myxospore development in myxococcus xanthus. | activities of the glyoxylate cycle enzymes isocitrate lyase (ec 4.1.3.1) and malate synthase (ec 4.1.3.2) were assayed in extracts prepared at different stages of myxospore formation in liquid cultures of myxococcus xanthus. activities of both enzymes attained peak values during conversion of rods to spheres. isocitrate lyase activity decreased after reaching its peak value. malate synthase activity also declined but at a much slower rate. the loss of isocitrate lyase activity could be prevented ... | 1972 | 5053882 |
| bacteriophage infection of myxococcus xanthus during cellular differentiation and vegetative growth. | 1972 | 5063429 | |
| myxospore formation in myxococcus xanthus: chemical changes in the cell wall during cellular morphogenesis. | vegetative cells of myxococcus xanthus (strain fb) were induced to form myxospores by the glycerol induction technique. several structural changes took place in the peptidoglycan during myxospore formation. the percent of the peptidoglycan comprised of monomer (disaccharide peptide) decreased from about 20% to approximately 7%. the proportion of the total diaminopimelic acid possessing a free amino group decreased about 11%. a carbohydrate containing only glucose was found to be bound, possibly ... | 1972 | 5086662 |
| bacteriolytic enzymes produced by myxococcus xanthus. | the bacteriolytic activities in the culture fluid of myxococcus xanthus were purified and separated into six active fractions by the use of bio-gel cm-2 and bio-gel p-60. these fractions were identified as: (i) an amidase, (ii) a glucosaminidase, (iii) a glucosaminidase and an amidase, (iv) a protease with probable amidase activity, (v) another protease with probable amidase activity, and (vi) a peptidase active on both d-alanyl-diaminopimelate and d-alanyl-lysine peptide bonds. on one occasion, ... | 1972 | 4622898 |
| membranes from myxococcus fulvus (myxobacterales) containing carotenoid glucosides. i. isolation and composition. | 1972 | 4340261 | |
| antagonistic effects of myxococcus xanthus on fungi. ii. isolation and characterization of inhibitory lipid factors. | 1973 | 4356271 | |
| ribonucleic acid and protein synthesis during germination of myxococcus xanthus myxospores. | ribonucleic acid (rna) and protein synthesis during myxospore germination were examined. when rna synthesis was inhibited more than 90% by either actinomycin d (act d) or rifampin, germination was prevented. the data were consistent with the interpretation that rifampin did not interfere with protein synthesis in any way other than by inhibition of messenger rna formation. act d concentrations as high as 20 mug/ml did not totally inhibit rna synthesis. in the presence of 8 mug of act d/ml, germi ... | 1973 | 4690965 |
| biosynthesis of carotenoid glucoside esters in myxococcus fulvus (myxobacterales): inhibition by nicotine and carotenoid turnover. | 1973 | 4713154 | |
| aspartokinase of myxococcus xanthus: "feedback stimulation" by required amino acids. | the aspartokinase activity found in extracts of the bacterium myxococcus xanthus was subject to feedback inhibition and feedback repression by l-threonine and l-lysine. both types of inhibition were essentially additive. the required amino acids, l-isoleucine and l-methionine, caused considerable increase in the activity of the enzyme. this phenomenon is referred to as "feedback stimulation." the polyamine, spermidine, exerted strong enhancement of the activity even at 0.1 mm. meso-diaminopimela ... | 1973 | 4717514 |
| aspartokinase activity and the developmental cycle of myxococcus xanthus. | the relationship between aspartokinase activity and fruiting body formation in myxococcus xanthus was investigated. two required amino acids, methionine and isoleucine, which stimulated the enzyme in vitro also inhibited fruiting body formation when added to 0.1% casitone agar. threonine, a potent feedback inhibitor of the aspartokinase, completely reversed the effects of methionine and isoleucine both on enzyme activity and fruiting body formation. a mutant, m. xanthus fb-s, which had the unusu ... | 1973 | 4717518 |
| some aspects of amino acid metabolism in the fruiting myxobacterium, myxococcus xanthus. | 1973 | 4725820 | |
| surface structure of gliding bacteria after freeze-etching. | ultrastructural studies of gliding bacteria demonstrate 10- to 11-nm beads on the inner surface of the outer bilayer of cytophaga columnaris. these were not found in myxococcus xanthus. on treatment with glutaraldehyde and ethanol, the beads appear in linear arrays. | 1973 | 4197273 |
| fatty acids of myxococcus xanthus. | fatty acids were extracted from saponified vegetative cells and myxospores of myxococcus xanthus and examined as the methyl esters by gas-liquid chromatography. the acids consisted mainly of c(14) to c(17) species. branched acids predominated, and iso-pentadecanoic acid constituted half or more of the mixture. the other leading component (11-28%) was found to be 11-n-hexadecenoic acid. among the unsaturated acids were two diunsaturated ones, an n-hexadecadienoic acid and an iso-heptadecadienoic ... | 1973 | 4197903 |
| studies on antiviral property of fruiting myxobacteria (myxococcus virescens). | 1973 | 4205758 | |
| bactericidal action of an antibiotic produced by myxococcus xanthus. | myxococcus xanthus produced an antibiotic during the end of its exponential growth phase which was capable of inhibiting growth of several gram-positive and gram-negative bacteria. the antibiotic was bactericidal to growing cultures only; chloramphenicol inhibited the bactericidal action of the antibiotic. upon addition of the antibiotic to escherichia coli b, deoxyribonucleic acid and ribonucleic acid as well as turbidity of the culture continued to increase even after the viable count decrease ... | 1973 | 4208901 |
| growth of surface colonies of the gliding bacterium myxococcus xanthus. | 1974 | 4209297 | |
| composition of lipopolysaccharides from myxococcus fulvus and other fruiting and non-fruiting myxobacteria. | 1974 | 4209347 | |
| intracellular proteolytic activity in developing myxospores of myxococcus xanthus. | 1974 | 4209409 | |
| autolytic activity associated with myxospore formation in myxococcus xanthus. | 1974 | 4209485 | |
| inhibition of carotenoid synthesis in myxococcus fulvus (myxobacterales). | 1974 | 4211208 | |
| effect of spermidine on morphogenesis in myxococcus fulvus. | 1974 | 4211963 | |
| presence of amino acid dehydrogenases and transaminases in myxococcus xanthus during vegetative growth and myxospore formation. | the following enzymatic activities were demonstrated in myxococcus xanthus during growth and myxospore formation: l-alanine dehydrogenase (ec 1.4.1.1), l-glutamic acid dehydrogenase (ec 1.4.1.2), glycine dehydrogenase (ec 1.4.1.5), l-glutamic glyoxylate aminotransferase (ec 2.6.1.4), and l-alanine glyoxylate aminotransferase (ec 2.6.1.12). | 1974 | 4212265 |
| studies on gliding motility in myxococcus xanthus. | 1974 | 4215396 | |
| flexibacter elegans and myxococcus fulvus: aerobic gram-negative bacteria containing menaquinones as the only isoprenoid quinones. | 1974 | 4216336 | |
| glycerol ester hydrolase, lipase, of myxococcus xanthus fb. | 1974 | 4208247 | |
| xanthacin. a bacteriocin of myxococcus xanthus fb. | 1974 | 4132608 | |
| de novo purine synthesis in vegetative cells and myxospores of myxococcus xanthus. | this study was designed to determine whether vegetative cells and myxospores of myxococcus xanthus were capable of classical de novo purine biosynthesis. to answer this question, vegetative and myxospore extracts of m. xanthus fba were tested for their ability to synthesize the second de novo intermediate, 5'-phosphoribosylglycinamide, from beginning precursors either by way of phosphoribosyl-pyrophosphate amido transferase (ec 2.4.2.14) or ribose-5-phosphate amino transferase. both the amido an ... | 1974 | 4360538 |
| inactivation of isocitrate lyase during myxospore development in myxococcus xanthus. | the inactivation of isocitrate lyase which occurs during late stages of myxospore formation in myxococcus xanthus was studied. several findings are reported. (i) protein synthesis is required over a specific time interval in order for isocitrate lyase inactivation to occur at a later time. (ii) metabolic energy is required at all times during myxospore development if the inactivation is to occur. (iii) it was possible to inhibit protein turnover to a considerable extent without affecting the net ... | 1974 | 4362466 |
| purification and partial characterization of an antibiotic produced by myxococcus xanthus. | 1974 | 4362757 | |
| intracellular and extracellular nucleotides and related compounds during the development of myxococcus xanthus. | changes in nucleotide pools and extracellular nucleotides during the developmental cycle of the myxobacterium myxococcus xanthus were determined using a high-pressure liquid chromatography nucleotide analyzer. a general increase in all nucleotide pools occurred during the morphological phase of glycerol conversion of vegetative cells to myxospores. the levels of the nucleoside triphosphate pools remained high as the myxospore matured and throughout subsequent germination. oxidized nicotinamide a ... | 1974 | 4364021 |
| fruiting-body formation and myxospore differentiation and germination in mxyococcus xanthus viewed by scanning electron microscopy. | streaming cells, fruiting bodies, and single cells undergoing myxospore differentiation and germination were examined in the fb strain of myxococcus xanthus by scanning electron microscopy. myxospores differentiated in fruiting bodies differed in size, in kinetics of germination, in the fate of the myxospore capsule, and in the external structure of the walls of newly emerged cells when compared with myxospores differentiated in liquid medium after glycerol induction. vegetative cells outgrowing ... | 1975 | 803486 |
| gene transfer to myxobacterium by escherichia coli phage p1. | myxococcus xanthus is a bacterium with an interest for studies of development because it has an organized multicellular phase in its life cycle. bacteriophage pl can adsorb to m. xanthus and inject its dna into this organism despite the wide taxonomic gap separating myxococcus from escherichia coli, the source of pl. a specialized transducing derivative of pl, called plcm, can carry a gene for chloramphenicol resistance from e. coli into m. xanthus and generate unstable drug-resistant strains. | 1975 | 803710 |
| myxospore induction in a nondispersed growing mutant of myxococcus xanthus. | myxococcus xanthus rb5, a rough-colony-forming, nondispersed growing mutant of strain fbt, forms macroscopic, multicellular masses of radially oriented cells in shake cultures. the cells appear to be held together by slime fibrils. physical and enzymatic methods to disrupt the spheres were unsuccessful as were attempts to isolate dispersed growing mutants. during incubation of the spheres in starvation medium, the cells within convert to myxospores, indistinguishable from those formed in fruiti ... | 1975 | 804470 |
| chloramphenicol resistance in myxococcus xanthus. | derivatives of myxococcus xanthus fb(t) resistant to chloramphenicol (25 mug/ml) arose spontaneously with a frequency of approximately 10(-7). one of these organisms (fb(t)cam(1) (r)) was characterized. fb(t)cam(1) (r) showed a unique type of phenotypic instability. after transfer from medium containing chloramphenicol to medium lacking the drug, resistance was lost after approximately one generation. the loss resulted in a sharp drop in the total number of chloramphenicol-resistant organisms an ... | 1975 | 806262 |
| transfer of drug resistance to myxococcus from bacteria carrying drug-resistance factors. | resistance to chloramphenicol was successfully transferred from strains of escherichia coli carrying r factors representative of compatibility groups f, w, s and n to strains of myxococcus xanthus and m. fulvus. resistance to kanamycin was transferred from an r factor in group s, and to neomycin from an r factor of group p. myxobacterial strains differed in their capacity to take up the resistances and also in the stability of the resistance character. strains of m. fulvus were obtained that acq ... | 1975 | 806655 |
| comparison of polysaccharides produced by myxococcus strains. | exopolysaccharides were prepared from cultures of four myxococcus strains grown on solid and in liquid media, and also from the fruiting bodies. lipopolysaccharides could be extracted with aqueous phenol from the vegetative bacteria, but were absent from microcysts. mannose and d-glucose were present in all the exopolysaccharides and three of the lipopolysaccharides examined. other monosaccharides identified in the exopolysaccharides were d-galactose, n-acetylglucosamine and n-acetylgalactosamin ... | 1975 | 807682 |