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bdellovibrio bacteriovorus gen. et sp. n., a predatory, ectoparasitic, and bacteriolytic microorganism. 196314068454
microbial ecology of activated sludge. ii. bacteriophages, bdellovibrio, coliforms, and other organisms.a comparative estimation of the coliform population of raw sewage, activated sludge, and the effluent derived therefrom revealed that raw sewage had a preponderance of escherichia coli (75%), as compared with 25 and 30%, respectively, in sludge and effluent. nitrogen-free mannitol-sucrose enrichments of activated sludge resulted in the isolation of azotobacter agilis, aerobacter aerogenes, corynebacterium laevaniformans, and an achromabacter species. sludge had a large population of c. laevanifo ...196514325890
lysis of gram-negative bacteria by host-independent ectoparasitic bdellovibrio bacteriovorus isolates. 19655325037
parasitic interaction of bdellovibrio bacteriovorus with other bacteria.starr, mortimer p. (university of california, davis), and nancy l. baigent. parasitic interaction of bdellovibrio bacteriovorus with other bacteria. j. bacteriol. 91:2006-2017. 1966.-the interactions of the predatory parasite, bdellovibrio bacteriovorus, with erwinia amylovora, pseudomonas tabaci, and p. phaseolicola were examined by means of phase-contrast and electron microscopy. attachment of the bdellovibrio to the host cell is apparently initially reversible; detachment occurs infrequently ...19665327913
[a new factor in autodepuration of water: bdellovibrio batteriovorus]. 19675616724
[electron microscope study of the lysis of salmonella by bdellovibrio bacteriovorus]. 19674965037
occurrence and enumeration of bdellovibrio bacteriovorus in soil capable of parasitizing escherichia coli and indigenous soil bacteria. 19674861489
[water bactericidal activity and the part played by bdellovibrio bacteriovorus]. 19676057341
interacton of bdellovibrio bacteriovorus and host bacteria. i. kinetic studies of attachment and invasion of escherichia coli b by bdellovibrio bacteriovorus.quantitative methods were developed for the study of the early stages in the interaction of bdellovibrio bacteriovorus and host bacteria. attachment measurements were based on the differential filtration of host and parasite. invasion was measured by estimation of radioactively labeled bdellovibrio cells remaining attached to the host cells after mechanical agitation. the kinetics of attachment and the final number of bdellovibrio cells attached were dependent on the multiplicity of the parasite ...19684868362
parasitism of azotobacter and rhizobium species by bdellovibrio bacteriovorus. 19684871505
electron microscopic observations on the penetration of bdellovibrio bacteriovorus into gram-negative bacterial hosts.the progressive stages in bdellovibrio bacteriovorus penetration into two strains of escherichia coli were examined by use of electron microscopic techniques. the initial change observed in the ultrastructure of the host following parasitic attack was the swelling of the cell envelope at the site of attachment. the bdellovibrio then appeared to pierce the center of this swelling, forming a pore in the outer wall layers of the host. the edges of this entry pore constricted the bdellovibrio throug ...19684879563
[bdellovibrio bacteriovorus--a predatory bacterial parasite]. 19684883361
[host range and infection cycle of a newly isolated strain of bdellovibrio bacteriovorus]. 19684974080
structure of the flagellum of bdellovibrio bacteriovorus. 19685650092
[isolation of bdellovibrio bacteriovorus, a parasite of salmonella typhosa, from river water]. 19685739144
[bdellovibrio bacteriovorus--the first case of parasitism of bacteria with other bacteria]. 19684236731
some energy-producing systems in bdellovibrio bacteriovorus, strain 6-5-s. 19684386240
[apropos of auto-purification of water by bdellovibrio]. 19684890382
interaction of bdellovibrio bacteriovorus and host bacteria. ii. intracellular growth and development of bdellovibrio bacteriovorus in liquid cultures.the intracellular life cycle of bdellovibrio bacteriovorus 109 growing on escherichia coli in a dilute nutrient medium exhibits a period of constant infective titer while the parasite grows and elongates inside the host cell. this period is terminated after 2 to 4 hr, and the number of the plaque-forming units in the culture rises rapidly to as much as six times the initial titer. the growth pattern of bdellovibrio is similar with actively growing or resting host cells, or with host cells killed ...19694895842
early effects of bdellovibrio infection on the syntheses of protein and rna of host bacteria. 19694900142
isolation and characterization of host-independent bdellovibrios.a reliable method has been developed for the isolation of host-independent (h-i; i.e., "saprophytic") strains of bdellovibrio from host-dependent (h-d; i.e., "parasitic") cultures. the technique involves growing streptomycin-resistant (sm(r)) h-d cultures on streptomycin-susceptible (sm(8)) host cells. a lysate containing large numbers of the sm(r) h-d cells and some remaining sm(8) host cells is transferred to a selection medium which contains the antibiotic. the sm(8) host cells in the lysate ...19694901359
deoxyribonucleic acid characterization of bdellovibrios.the guanine plus cytosine (gc) content of the deoxyribonucleic acid (dna) of 11 isolates of host-dependent (h-d) bdellovibrios and 18 host-independent (h-i) derivatives was determined from thermal denaturation curves and buoyant densities in cscl. the h-d and respective h-i cultures have gc contents which are identical within the limits of experimental error. most cultures of bdellovibrio bacteriovorus, including the holotype culture, have 50.4 +/- 0.9 moles% gc in their dna; two bdellovibrio is ...19694901360
morphological and physiological aspects of the interaction of bdellovibrio with host bacteria. 19694907693
factors affecting the intracellular parasitic growth of bdellovibrio bacteriovorus developing within escherichia coli.a procedure for one-step growth experiments on bdellovibrio bacteriovorus growing parasitically in escherichia coli b was developed. the resulting one-step growth curves showed that, under defined conditions at 30 c, each singly infected e. coli host cell, on the average, gave rise to 5.7 bdellovibrio cells. this value was confirmed by single-burst experiments and by microscopic observations. in the temperature range of 25 to 38 c, the average burst size and the duration of the latent period wer ...19694886299
attachment of bdellovibrio bacteriovorus to cell wall mutants of salmonella spp. and escherichia coli. 19694886305
[isolation and study of bdellovibrio bacteriovorus]. 19694926575
bdellovibrio bacteriovorus parasitizing rhizobium in western australia. 19705447473
[presence of glycopeptide in the cell wall of bdellovibrio bacteriovorus]. 19704987653
bdellovibrio bacteriovorus parasitism in shigella species.bdellovibrio bacteriovorus was capable of parasitizing shigella boydii, s. flexneri, and s. sonnei. the bdellovibrio was able to produce plaques on lawns consisting of heat-killed or ultraviolet-irradiated s. boydii.197016557841
early host damage in the infection cycle of bdellovibrio bacteriovorus.the effects of bdellovibrio infection on host permeability and respiration were investigated by measuring respiration rates and the rate of o-nitrophenyl-beta-d-galactopyranoside hydrolysis during the course of single infection cycles of bdellovibrio bacteriovorus strain 109 growing on escherichia coli ml 35 (lac i(-)z(+)y(-)). the data show that among the very early consequences of parasite attack on the host are an increase in permeability and a general disruption of respiratory activity of th ...19704908670
facultatively parasitic strain of bdellovibrio bacteriovorus.a strain of bdellovibrio bacteriovorus (designated strain uki2) was isolated which was capable of growing either saprophytically in host-free medium or endoparasitically in escherichia coli b/r. it was quantitatively determined that each bdellovibrio could develop in solid medium to produce a colony, and 65% of the cells in a late exponential-phase culture were capable of inducing e. coli b/r spheroplasts. a photomicrographic sequence of single e. coli spheroplasts containing bdellovibrios demon ...19704908792
ultrastructure and cell division of a facultatively parasitic strain of bdellovibrio bacteriovorus.some aspects of cell development and division of bdellovibrio bacteriovorus strain uki2 were examined by use of electron microscopic techniques. under saprophytic and parasitic conditions of growth, the comma-shaped cells enlarge, elongate, and form helical filaments. the mechanism of division appears to consist of an asymmetrical constriction of the filamentous cell by the cytoplasmic membrane, accompanied by a breakdown of the outer layers of the cell wall in the division region. during regene ...19704908793
[infection and lysis of gram-negative bacteria by the parasitic bacteria bdellovibrio bacteriovorus]. 19704923659
isolation of a bacteriophage for bdellovibrio bacteriovorus.a phage infective for bdellovibrio bacteriovorus was isolated. electron microscopy revealed that it is tail-less, has a hexagonal appearance and two distinct capsomere layers, and is 60 to 70 nm in size. the nucleic acid appears to be single-stranded deoxyribonucleic acid. this is the first report of the isolation of a phage infective for b. bacteriovorus.19704191817
structural properties and features of parasitic bdellovibrio bacteriovorus.the structure of five parasitic strains of bdellovibrio bacteriovorus was studied by electron microscope after negative staining and in shadow-case and etched freeze-fractured preparations. special attention was paid to the cell wall and the flagellar sheath which is continuous with the wall or part of it. these structural components reveal distinct features which are induced by certain staining substances; they are exceedingly susceptible to disruption by physical treatments, and in old cells o ...19704099101
[comparative studies on the content of long-chain, branched and non-branched fatty acids of bdellovibrio bacteriovorus, a saphrophytic mutant, and escherichia coli]. 19714400130
changes in the permeability of escherichia coli during parasitization by bdellovibrio bacteriovorus. 19714932409
[current status of the study of a new parasitic group of bacteria, bdellovibrio bacteriovorus]. 19724576702
[electron microscopic study of parasitism by bdellovibrio chlorellavorus bacteria on cells of the green alga chlorella vulgaris]. 19725011884
[cyst-like cells of the soil strain of bdellovibrio bacteriovorus]. 19725013102
the isolation and characterization of a strain of bdellovibrio bacteriovorus. 19725058665
[methods of concentrating and separating bdellovibrio bacteriovorus from host cells]. 19724551565
three-membered parasitic system: a bacteriophage, bdellovibrio bacteriovorus, and escherichia coli.two bacteriophages for bdellovibrio bacteriovorus were isolated. one of the phages (vl-1) was isolated on a host-independent bdellovibrio strain, and the other (vl-2) was isolated on a host-dependent strain. both phages grew on host-dependent as well as on host-independent bdellovibrio strains. the development of the phages in host-dependent bdellovibrios occurred only when the phage-infected bdellovibrios parasitized cells of other bacteria. in the absence of other bacteria, the phages adsorbed ...19724552554
kinetics of deoxyribonucleic acid destruction and synthesis during growth of bdellovibrio bacteriovorus strain 109d on pseudomonas putida and escherichia coli.during the growth of bdellovibrio bacteriovorus on pseudomonas putida or escherichia coli in either 10(-3)m tris(hydroxymethyl)aminomethane or in dilute nutrient broth, the host deoxyribonucleic acid (dna) was rapidly degraded, and by 30 to 60 min after the initiation of the bdellovibrio development cycle essentially all host dna became nonbandable in cscl gradients. at this stage the host dna degradation products were nondiffusable, and there was no appreciable pool of low-molecular-weight (col ...19724559819
evidence for a lytic enzyme produced by bdellovibrio bacteriovorus 6-5-s. 19724560485
molecular heterogeneity of the bdellovibrios: evidence of two new species.a systematic examination of a variety of isolates of the bacterial endoparasite bdellovibrio has revealed extensive molecular diversity. the quantity of deoxyribonucleic acid (dna) polynucleotide homology ranges from more than 90% among the isolates with dna containing 50 to 51% guanine plus cytosine (gc) to undetectable levels between the 43% gc and 51% gc isolates. the two isolates with low gc-containing dna (h-i bdellovibrio a3.12 and uki2) have only 16% dna homology. h-i bdellovibrio a3.12 a ...19724621626
[isolation and concentration of bdellovibrio bacteriovorus]. 19724624962
relationship between bdellovibrio bacteriovorus 6-5-s and autoclaved host bacteria. 19724630968
nonidentity of bdellovibrio bacteriovorus strains 109d and 109j.two strains of bdellovibrio bacteriovorus, both designated as 109 in the literature, differ. they should be referred to as 109d and 109j to avoid further confusion.19724109891
the fine structure of "resting bodies" of bdellovibrio sp. strain w developed in rhodospirillum rubrum. 19724110832
isolation and preliminary characterization of bacteriophages for bdellovibrio bacteriovorus.ten bacteriophages that attack and lyse saprophytic strains of bdellovibrio bacteriovorus were isolated. morphological, serological, and host-range studies revealed that there were four different bdellovibrio phages present among the isolates. one of the phages lysed a strain of b. bacteriovorus that requires the presence of a suitable bacterial host for growth. the phage attached to the bdellovibrio cells in the absence of the bacterial host cells; lysis occurred only in the presence of host ce ...19724116140
a new bacteriophage specific for a saprophytic mutant of bdellovibrio bacteriovorus. 19724118526
development of bdellophage vl-1 in parasitic and saprophytic bdellovibrios.ultrastructure was correlated with growth kinetics of bdellophage vl-1 infecting host-dependent ("parasitic") bdellovibrio bacteriovorus 109j in its escherichia coli b host (the three-membered system), as well as in the host-independent ("saprophytic") derivative of the bdellovibrio. electron microscope observations showed the arrested growth of the phage-infected bdellovibrios, polar localization of the phage progeny, and stages in their release. present evidence indicates that bdellophage dna ...19734128380
[multiplication of the bacteriolytic agent bdellovibrio bacteriovorus and intensity of bacteriolysis according to the initial density in host bacteria]. 19734196775
a growth initiation factor for host-independent derivatives of bdellovibrio bacteriovorus.host-independent (h-i) derivatives of bdellovibrio bacteriovorus 109 davis could not be isolated when concentrated suspensions of host-dependent (h-d) cultures, washed free of spent medium, were plated on host-free media. however, h-i colonies did appear when spent broth was incorporated into the isolation medium, indicating the presence of a factor in the spent medium essential for the growth of h-i cells. this growth factor (gif) was also present in cell-free extracts of escherichia coli and a ...19734197902
[dna-methylase specificity in pseudomonas fluorescens cells before and after infection by bdellovibrio bacteriovorus]. 19734633064
purification and characterization of a lytic peptidase produced by bdellovibrio bacteriovorus 6-5-s. 19734709167
[characteristics of the multiplication of soil bdellovibrio in host cells]. 19734722136
occurrence of phosphonosphingolipids in bdellovibrio bacteriovorus strain uki2.the major phospholipids of two strains of bdellovibrio bacteriovorus were characterized. both strain uki1, which is obligately saprophytic, and strain uki2, which is facultatively parasitic, contained phosphatidylethanolamine and phosphatidylglycerol as their major glycerophosphatides. a branched, 15-carbon fatty acid is the major component of these alkali-labile lipids. absent from uki1 but present in uki2 were three alkali-stable lipids (compounds 8, 9, and 11) which appear to be phosphosphing ...19734752938
[electron microscopic data on the penetration of bdellovibrio bacteriovorus into the cholera vibrio]. 19734754353
[study of the virulence, toxicity and immunogenicity of different strains of bdellovibrio bacteriovorus]. 19734769749
respiration of bdellovibrio bacteriovorus strain 109j and its energy substrates for intraperiplasmic growth.measurements of oxidation rates, respiratory quotients (rq), and release of (14)co(2) from uniformly labeled substrates showed that glutamate, alpha-ketoglutarate, and synthetic and natural amino acid mixtures are oxidized by suspensions of bdellovibrio bacteriovorus strain 109j. the oxidation of these substrates largely suppress the endogenous respiration of the bdellovibrio cells and may or may not cause a small increase, 20 to 50%, in their rate of oxygen consumption. the failure of respired ...19734570779
[study of bdellovibrio bacteriovorus as 1 of the biological factors in the self-purification of surface waters]. 19734572501
[dynamics of changes in the nuclear apparatus of bdellovibrio bacteriovorus and in the bacterial host escherichia coli in the process of their interaction]. 19734592067
[isolation of parasitic and saprophytic strains of bdellovibrio bacteriovorus from natural waters]. 19734593002
[electron microscopic studies of the bacterial parasite bdellovibrio bacteriovorus stolp a. starr gen. et sp. nov]. 19734600724
isolation of host-dependent and nonparasitic mutants of the facultative parasitic bdellovibrio uki2.obligate host-dependent and nonparasitic mutants were isolated from a facultative parasitic bdellovibrio strain. thus it is possible to separate host-dependency from the ability to parasitize in bdellovibrios.19744604646
the effect of r antigen on the attachment of bdellovibrio bacteriovorus to salmonella typhimurium. 19744605250
chemotaxis in bdellovibrio bacteriovorus.chemotaxis toward yeast extract is demonstrated in obligately and facultatively parasitic strains of bdellovibrio bacteriovorus.19744608875
ultrastructural aspects of localized membrane damage in spirillum serpens vhl early in its association with bdellovibrio bacteriovorus 109d. 19744615643
[interaction of bdellovibrio bacteriovorus with the cytoplasmic membrane of escherichia coli b]. 19744615754
[physiological characteristics of the interaction of bdellovibrio bacteriovorus with the bacterial host]. 19744618274
minimum nutritional requirements for growth of host-independent derivatives of bdellovibrio bacteriovorus strain 109 davis. 19744595744
intracellular growth of bdellovibrio bacteriovorus 6-5-s in heat-killed spirillum serpens vhl. 19744599888
changes in cell composition and viability of bdellovibrio bacteriovorus during starvation. 19744599992
the involvement of extracellular enzymes in the metabolism of bdellovibrio. 19744600233
[distribution of bdellovibrio bacteriovorus in the water of an open reservoir and its role in the processes of self purification]. 19744442746
[halotolerant forms of bdellovibrio in the silt and water of lake balkhash and the aral sea]. 19744461735
penetration of bdellovibrio bacteriovorus into host cells.electron microscopy reveals that, in bdellovibrio infection, after the formation of a passage pore in the host cell wall, the differentiated parasite penetration pole is associated with the host protoplast. this firm contact persists throughout the parasite penetration and after this process is completed. in penetrated hosts this contact is also apparent by phase microscopy. the association between the walls of the parasite and the host at the passage pore, on the other hand, is transient. bdell ...19744208138
[dynamic characteristics of interactions between the micropredator bdellovibrio bacteriovorus and the bacterium-host as a function of their relative initial densities]. 19744211068
[quantitative characteristics of the distribution of bdellovibrio bacteriovorus in river water]. 19744281458
[biochemical characteristics of the facultatively parasitic strain bdellovibrio bacteriovorus]. 19744281602
[characteristics of a new strain of bdellovibrio bacteriovorus--an enterobacterial parasite, isolated from the moscow river]. 19744281789
isolation and characterization of temperature-sensitive mutants of host-dependent bdellovibrio bacteriovorus 109d.a variety of temperature-sensitive mutants of host-dependent bdellovibrio bacteriovorus 109d were selected after ethyl methane sulfonate mutagenesis. mutants that demonstrated plaque-forming ability reversion frequencies of 10(-8) to 10(-9) were chosen for further study. representatives of these mutants were then characterized by phase-contrast and electron microscopy, temperature-shifted one-step growth experiments, attachment kinetics, and macromolecular capabilities. representative mutants de ...19744360541
growth cycle of predacious bdellovibrios in a host-free extract system and some properties of the host extract.host-free growth and reproduction of a host-dependent strain of bdellovibrio bacteriovorus incubated with an extract from host cells were studied. the morphological changes occurring in the cells were correlated with deoxyribonucleic acid (dna) synthesis as measured by labeled nucleotide or orthophosphate incorporation. the host-free developmental cycle of bdellovibrio is similar to that of the two-membered system; the early loss of flagella, the elongation into filaments, and multiple fission i ...19744587608
[health aspects of the study of bdellovibrio bacteriovorus as a natural factor in the self-purification of reservoirs]. 1975179245
interaction between bdellovibrio bacteriovorus and the cytoplasmic membrane of escherichia coli b.adsorption of bdellovibrio bacteriovours (bdv) on the surface of escherichia coli is accompanied by a sharp decrease in the initial rate of entry of alpha-methylglucoside-c-14 and thiomethlgalactopyranoside-c-14 into the host cell. interaction between the parasite and e. coli leads to the rapid departure of previously accumulated labeled glucosides and beta-galactosides from the bacteria. meanwhile the atpcontent in e. coli falls sharply. adsorption bdv e.coli spheroplasts was established as a f ...1975803849
[characteristics of spheroplast formation in the bacterial host in the process of interacting with bdellovibrio bacteriovorus]. 1975806155
[purity criteria for bdellovibrio bacteriovorus cultures].two-component cultures of bdellovibrio bacteriovorus, a bacterial parasite, are not always pure; sometimes they contain microbial forms, different from the host and parasite, which cannot be isolated by conventional techniques of inoculation on solid growth media. the only way to isolate them is to apply techniques used for the reversion of l-forms of bacteria. the isolated microorganisms have been identified. the criteria of purity were established for two-component cultures consisting of the h ...1975809647
bdellovibrio as symbiont; the associations of bdellovibrios with other bacteria interpreted in terms of a generalized scheme for classifying organismic associations. 1975785671
effects of methotrexate on intraperiplasmic and axenic growth of bdellovibrio bacteriovorus.the intraperiplasmic growth rate and cell yield of wild-type bdellovibrio bacteriovorus 109j, growing on escherichia coli of normal composition as the substrate, were not markedly inhibited by 10-3 m methotrexate (4-amino-n10-methylpteroylglutamic acid). in contrast, the growth rate and cell yield of the mutant 109ja, growing axenically in 0.5% yeast extract +0.15% peptone, were strongly inhibited by 10-4 and 10-3 m methotrexate. thymine, thymidine, and thymidine-5'-monophosphate, in increasing ...19751090593
utilization of nucleoside monophosphates per se for intraperiplasmic growth of bdellovibrio bacteriovorus.during growth of bdellovibrio bacteriovorus on escherichia coli, there was a marked preferential use of e. coli phosphorus over exogenous orthophosphate even though the latter permeated into the intraperiplasmic space where the bdellovibrio was growing. this preferential use occurred to an equal extent for lipid phosphorus and nucleic acid phosphorus. exogenous thymidine-5'-monophosphate competed effectively with [3h]thymine residues of e. coli as a precursor for bdellovibrio deoxyribonucleic ac ...19751090594
incorporation of long-chain fatty acids of the substrate organism by bdellovibrio bacteriovorus during intraperiplasmic growth.data are presented showing that a large proportion of the fatty acids of bdellovibrio bacteriovorus grown intraperiplasmically are derived unaltered from the fatty acids of its substrate organism. those fatty acids of the bdellovibrio not homologous with those of the substrate organism are derived mainly by metabolic alteration of preexisting fatty acids in the latter. de novo synthesis from acetate occurs only to a small extent. these characteristics of bdellovibrio physiology are in part respo ...19751090595
energy efficiency of intraperiplasmic growth of bdellovibrio bacteriovorus.the y-atp (energy efficiency) of intraperiplasmic growth of bdellovibrio bacteriovorus was determined from the distribution of radioactivity of the substrate organism ([u-14c]escherichia coli) btween co2 and bdellovibrio cells at the end of growth. a "best" y-atp value of 18.5 was obtained from single growth cycle experiments and an average value of 25.9 from multicycle experiments. both values are much higher than the usual value of 10.5 for bacteria growing in rich media. the bases for the unu ...19751090596
membrane damage and incorporation of escherichia coli components into bdellovibrio bacteriovorus.cytoplasmic membrane of e. coli is degraded within 20 min following infection with bdellovibrio. 50% of cellular 42-k is lost during the first 10 min. the cytoplasmic membrane, 20 min after infection, centrifugated on a sucrose gradient produces a wide band containing the main enzyme activities (succinic dehydrogenase and lactic dehydrogenase) bound to the membrane. the incorporation into bdellovibrio of labelled host cell constituents during intracellular growth has been studied at successive i ...19751096504
application of the deoxyribonucleic acid/ribonucleic acid hybridization technique in bdellovibrio as a model for studying ribonucleic acid turnover in host-parasite systems.the kinetics of host ribonucleic acid (rna) degradation and its resynthesis into bdellovibrio-specific polyribonucleotides has been studied. the kinetics of rna turnover was followed during a one-step synchronous growth cycle of bdellovibrio growing within 32-po4-labeled escherichia coli host cells. the species of labeled rna present at any given time was ascertained through the specificity of the deoxyribonuclei acid (dna)/rna hybridization technique. at nearsaturating levels of rna and at zero ...19751096825
ribonucleic acid destruction and synthesis during intraperiplasmic growth of bdellovibrio bacteriovorus.during growth of bdellovibrio bacteriovorus on (2-14c)uracil-labeled escherichia coli approximately 50% of the radioactivity is incorporated by the bdellovibrio and most of the remainder is released as free nucleic acid bases. kinetic studies showed that 50 and 30s ribosomal particles and 23 and 16s ribosomal ribonucleic acid (rna) of e. coli are almost completely degraded by the first 90 min in a 210- to 240-min bdellovibrio developmental cycle. synthesis of bdellovibrio ribosomal rna was first ...19751097411
sizing of bdellovibrio during growth.a technique for the counting and relative sizing of host-independent bdellovibrio during growth, with the aid of a modified coulter counter, is described.19751100613
symbiosis-independent and symbiosis-incompetent mutants of bdellovibrio bacteriovorus 109j.symbiosis-independent (sin) mutants were isolated from the symbiosis-dependent and symbiosis-competent (sdcomp+) bdellovibrio bacteriovorus 109j. independently isolated sin mutants were examined for their symbiosis competence and most were found to be comp+. bdellovibrios comp- were selected from the sincomp+ mutants. the sincomp+ bdellovibrios are always at a selective disadvantage, either against sincomp- bdellovibrios (in organic medium) or against sdcomp+ bdellovibrios (in buffer with escher ...19751104576
a volatile factor inducing transmissible lysis in gaeumannomyces graminis (sacc.) arx and olivier var. tritici walker.filtered water extract of gabalong soil with a recent history of take-all in wheat caused lytic plaques to form in agar cultures of a virulent strain of gaeumannomyces graminis var. tritici. the plaques resembled those produced by bdellovibrio on plate seeded with bacteria. however, there was no evidence of the presence of bacteria, viruses, or mycoplasmas. the lytic factor was transmissible in culture filtrates to fresh subcultures of the fungus. exposure of young healthy colonies to sublethal ...19751116042
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