Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| zygospores and sexual strains in the common bread mould, rhizopus nigricans. | 1906 | 17772189 | |
| longevity in spores of aspergillus oryzae and rhizopus nigricans. | 1923 | 17774267 | |
| isoelectric points for the mycelium of fungi. | 1. mycelium of rhizopus nigricans when stained with certain acid and basic dyes and washed with buffer mixtures of 0.1 m phosphoric acid and sodium hydroxide responded much like an amphoteric colloid with an isoelectric point near ph 5.0. 2. when grown on potato dextrose agar the reaction of which was varied with phosphoric acid the extent of colony growth of rhizopus nigricans plotted against the initial sörensen value of the agar produced a double maximum curve with the minimum between the two ... | 1924 | 19872067 |
| fumaric acid formation associated with sexuality in a strain of rhizopus nigricans. | 1939 | 17732505 | |
| anaerobic formation of fumaric acid by the mold rhizopus nigricans. | 1948 | 18880574 | |
| anaerobic formation of fumaric acid by the mold rhizopus nigricans. | 1948 | 16561577 | |
| aerobic formation of fumaric acid in the mold rhizopus nigricans, synthesis by direct c2 condensation. | 1949 | 15398809 | |
| carbon dioxide inhibition of anaerobic fumarate formation in the mold rhizopus nigricans. | 1949 | 18113497 | |
| [use of rhizopus nigricans in biological tests; preliminary note]. | 1952 | 13121504 | |
| chemotropism in rhizopus nigricans; the staling reaction. | 1952 | 14938407 | |
| the mineral nutrition of rhizopus stolonifer. | 1957 | 13491800 | |
| [observations on hydrotropism in rhizopus nigricans]. | 1959 | 13766172 | |
| continuous microbiological transformation of steroids. | continuous fermentation trials on the bioconversions of pregnadiene to pregnatriene by septomyxa affinis and progesterone to 11alpha-hydroxyprogesterone by rhizopus nigricans were conducted successfully in an eight-stage pilot plant reactor. the first stage was used as the mycelial growth stage while the steroid solutions were added continuously to stage 2, thus using the remaining stages as conversion vessels. recoveries of 50 to 60% oxidized steroid (based on total steroid supplied) were obtai ... | 1961 | 13740999 |
| [the notion of apical dominance in rhizopus nigricans ehrenberg]. | 1961 | 14462470 | |
| [biological transformation of 16alpha,17alpha-dihydroxyprogesterone with the aid of the fungus rhizopus nigricans]. | 1962 | 13865059 | |
| survey of selected filamentous fungi for voges-proskauer reactions. | of 16 filamentous fungi surveyed for voges-proskauer reactants, 81.2% were found to be positive. the total group fell into three classes: those producing considerable acetylmethylcarbinol (amc), those producing a small amount, and those producing no amc. oidium lactis had a highly significant effect upon lowering the amount of voges-proskauer reactants produced by rhizopus nigricans. | 1962 | 13945071 |
| ballistic disruption of penicillium chrysogenum cells. | the use of glass beads in a high-speed mixing device to rupture organisms was applied to molds. the use of a mixer in which the propellor shaft enters from the top into a metal mixing chamber made it possible to immerse the whole device in a salt water and ice mixture so that the temperature of the glass-bead slurry could be kept below 5 c without difficulty. mycelia, glass beads, and buffer in a 1:2:3 (w/w) ratio gave above 95% breakage in 15 min with penicillium chrysogenum cells and in 4 min ... | 1962 | 13952345 |
| recovery of gamma irradiated rhizopus stolonifer sporangiospores during autoinhibition of germination. | 1963 | 13978189 | |
| submicroscopic morphology of rhizopus nigricans. | 1963 | 14061859 | |
| zinc stimulation of rna and protein synthesis in rhizopus nigricans. | addition of 1.7 x 10-(5)m zinc sulfate to cultures of rhizopus nigricans increases growth and substrate utilization. analysis of cells during the course of growth, after addition of the metal, showed that there was an immediate increase in rna, followed by a corresponding increase in protein and cell mass. the dna content was affected to a lesser extent. it is postulated that zn(++) stimulates growth through a primary effect on rna synthesis. | 1963 | 14075699 |
| fungi associated with softening of bisulfite-brined cherries. | softening of sound, calcium bisulfite-brined cherries was induced fairly quickly by brining them with cherries rotted by aspergillus niger, cytospora leucostoma, and penicillium expansum, but not with cherries rotted by a variety of other microorganisms, including alternaria sp., aspergillus oryzae, aureobasidium pullulans, botrytis cinerea, cladosporium sp., mucor racemosus, rhizopus stolonifer, and sclerotinia fructicola. rapid softening was correlated with the presence of a bisulfite-stable p ... | 1963 | 16349630 |
| production of pectolytic enzymes by rhizopus stolonifer sporangiospores after "lethal" gamma irradiation. | irradiated sporangiospores of rhizopus stolonifer excreted pectolytic enzymes, which hydrolyzed pectin and macerated potato tuber discs, into the suspending medium. pectin glycosidase, but not pectin methylesterase, activity developed regardless of the amount of radiation the spores had received, unless the dose exceeded about 1 megarad. the ability to produce pectolytic enzymes was found to be more radiation-resistant than the potential for colony formation or the ability to germinate. spores m ... | 1963 | 16349638 |
| control of isocitratase formation in rhizopus nigricans. | wegener, warner s. (university of cincinnati, cincinnati, ohio), and antonio h. romano. control of isocitratase formation in rhizopus nigricans. j. bacteriol. 87:156-161. 1964.-a fumaric acid-producing strain of rhizopus nigricans was found to produce a fair level of isocitratase in a casein hydrolysate medium. glucose repressed enzyme formation. when glucose was utilized during growth, there was a relief of repression, and enzyme synthesis was resumed at a rate equivalent to that found in nonre ... | 1964 | 14102849 |
| some factors influencing the efficiency of production of acetylmethylcarbinol by rhizopus nigricans. | incubation time had no effect on the efficiency ratio [dry weight-acetylmethylcarbinol (amc)] during the incubation times tested. the mycelium was more efficient in synthetic media at ph 3 and 4 than at ph 5 and 6. mycelium also produced amc more efficiently in apple juice and in synthetic media containing yeast extract or vitamins, especially thiamine. kcl, mgso(4), and kh(2)po(4) had significant suppressing effects on amc production in a synthetic medium. | 1964 | 14131362 |
| an oxygen-dependent postirradiation restoration of rhizopus stolonifer sporangiospores. | 1964 | 14157357 | |
| fungistatic effects of controlled atmospheres. | the fungistatic effects of controlled atmospheres composed of increased co(2) and decreased o(2) was studied in a manner such that the condition of stored fruit was not a factor in the growth of the fungi. varying concentrations of o(2) and co(2) were used. the fungi used were botrytis alli, rhizopus nigricans, and penicillium expansum. the results showed that controlled atmospheres, within the limits of concentrations usable for fruit storage, are effective fungistatic agents. | 1966 | 5951331 |
| ultrasound and the ultramicroscopic structure of rhizopus nigricans. | 1966 | 5990081 | |
| effects of chemical protection on repair of potentially lethal irradiation injury in rhizopus stolonifer sporangiospores. | 1967 | 6019779 | |
| mechanism of fumaric acid accumulation in rhizopus nigricans. | it is doubtful that the glyoxylate bypass plays a significant role in the accumulation of fumaric acid by fungi, as has been postulated. in high glucose media, which favor fumarate production, isocitrate lyase (threo-d(s) isocitrate glyoxylate lyase), which is the key enzyme of the glyoxylate bypass, is strongly repressed. the specific activity of this enzyme remains low as long as glucose is present in the medium, even though fumarate formation proceeds at a high level. in addition, the activit ... | 1967 | 6020565 |
| control of malate synthase formation in rhizopus nigricans. | the control of malate synthase formation in a fumaric acid-producing strain of rhizopus nigricans has been found to be similar in most respects to that of isocitrate lyase, the companion enzyme of the glyoxylate bypass. a basal level is formed in a casein hydrolysate medium, which is repressed by glucose. utilization of glucose during growth results in relief of glucose repression. any factor which stimulates growth promotes relief of glucose repression by enhancing the incorporation of represso ... | 1967 | 6074401 |
| substrate effect on 2,3-butylene glycol production by rhizopus nigricans and penicillium expansum. | rhizopus nigricans and penicillium expansum produced 2,3-butylene glycol which accumulated in natural and artificial media with time. mycelial mats of p. expansum decreased the quantity of a diacetyl substrate and converted part of this substrate into acetylmethylcarbinol (amc) and 2,3-butylene glycol. mycelial mats of p. expansum also decreased amc substrate with the formation of 2,3-butylene glycol. 2,3-butylene glycol decreased slightly during incubation with the fungal mat. the formation of ... | 1967 | 6080717 |
| influence of phosphate compounds on certain fungi and their preservative effects on fresh cherry fruit (prunus cerasus, l.). | studies were conducted to ascertain the retarding effects of four phosphate compounds (sodium hexametaphosphate, sodium tripolyphosphate, sodium tetraphosphate, and tetrasodium pyrophosphate) on molding of fresh cherries (prunus cerasus, l.). in vitro studies on their antimycotic effects against the most common fungal spoilers, penicillium expansum, rhizopus nigricans, and botrytis sp., were also carried out. sodium tetraphosphate appeared to be the most effective compound in preserving cherries ... | 1968 | 4295176 |
| ultrastructural details in germinating sporangiospores of rhizopus stolonifer and rhizopus arrhizus. | electron microscope examination of sporangiospore sections from rhizopus stolonifer (ehrenb. ex fr.) lind. and r. arrhizus fischer revealed details on intracellular organization not previously reported. aldehyde fixation followed by chromeosmium postfixation permitted clear depiction of ribosomes hitherto unrevealed in these cells. mitochondria were diversiform. spore wall structures in the two species were generally similar, but outer contours differed sufficiently to permit easy species identi ... | 1968 | 4876136 |
| formation and regeneration of protoplasts in the mold rhizopus nigricans. | 1968 | 5672584 | |
| ultrastructural changes in rhizopus stolonifer sporangiospores in response to anaerobiosis. | rhizopus stolonifer sporangiospores developed prominent ultrastructural changes under anoxia. mitochondria were scattered randomly throughout the cytoplasm in spores incubated aerobically for 3 hr, but moved to the periphery of the cytoplasm when the spores were exposed to anoxia. endoplasmic reticulum, inconspicuous in control spores, appeared near the plasmalemma and was frequently found connected to a nuclear membrane. the cytoplasm, otherwise usually uniformly dense and containing abundant r ... | 1969 | 5784225 |
| organization of enzymes in the common aromatic synthetic pathway: evidence for aggregation in fungi. | centrifugation in sucrose density gradients of partially purified extracts from six species of fungi, i.e., rhizopus stolonifer, phycomyces nitens, absidia glauca (phycomycetes), aspergillus nidulans (ascomycetes), coprinus lagopus, and ustilago maydis (basidiomycetes), indicate that the five enzymes catalyzing steps two to six in the prechorismic acid part of the polyaromatic synthetic pathway sediment together. the sedimentation coefficients for these enzymes are very similar in the six specie ... | 1969 | 5802608 |
| inactivation of rhizopus stolonifer sporangiospores by single and combined treatments of heating, chilling, and gamma-irradiation. | 1969 | 5821201 | |
| pyruvate carboxylase of rhizopus nigricans and its role in fumaric acid production. | 1969 | 5349282 | |
| protein synthesis during fungal spore germination. iv. transfer ribonucleic acid from germinated and ungerminated spores. | transfer ribonucleic acid (trna) fractions isolated from germinated and ungerminated spores of botryodiplodia theobromae and rhizopus stolonifer had acceptor activity for all 20 amino acids commonly found in protein, when tested with an enzyme fraction from germinated spores. accordingly, it is unlikely that the absence of trna for a particular amino acid limits protein synthesis in fungal spores. | 1969 | 5364287 |
| microbiological transformations. i. hydroxylation of progesterone at c-11 by rhizopus nigricans and penicillium oxalicum. | 1969 | 5380069 | |
| [hydroxylation of progesterone by rhizopus nigricans]. | 1969 | 4981103 | |
| [hydroxylation of progesterone by rhizopus nigricans in the presence of chloramphenicol]. | 1970 | 4986691 | |
| transformation of progesterone by aspergillus niger 100 and rhizopus nigricans ref, 129. | 1970 | 5420621 | |
| [method for determination of bacterial mobility by culture on rhizopus nigricans]. | 1970 | 5426400 | |
| transformation of progesterone by rhizopus nigricans ref 129 as influenced by modification of the fermentation medium. | 1970 | 5460205 | |
| hemolytic activity of rhizopus nigricans and rhizopus arrhizus. | 1970 | 5466029 | |
| preliminary characterization of the hemolysin of rhizopus nigricans. | 1970 | 5466030 | |
| acidic polysaccharides from the cell wall of absidia cylindrospora, mucor mucedo, and rhizopus nigricans. | 1970 | 5471789 | |
| [rhizopus nigricans ehrenberg. first results of the physico-chemical and biological study of a culture filtrate]. | 1970 | 5500091 | |
| [effect of some cultivation conditions on the ability of mucor fungi tieghemella hyalospora and rhizopus nigricans to effect 11 alpha-hydroxylation of steroid molecules]. | 1971 | 5567625 | |
| studies on fungal polysaccharides. ix. the acidic polysaccharide from the cell wall of rhizopus nigricans. | 1971 | 5145919 | |
| [determination of the bacterial motility rate by cultivation with rhizopus nigricans]. | 1971 | 5146296 | |
| [rhizopus nigricans ehrenberg. studies on its nitrogen nutrition; correlative study of the ponderal growth of the mycelium, of the media ph and of the spectrum of culture filtrates as a function of time]. | 1971 | 5149948 | |
| the in vitro transformation of progesterone by rhizopus nigricans ref 129. | 1971 | 5160388 | |
| changes in soluble ribonucleic acid polymerases associated with the germination of rhizopus stolonifer spores. | 1972 | 5043713 | |
| protein synthesis during fungal-spore germination. vi. analysis of transfer ribonucleic acid from germinated and ungerminated spores of rhizopus stolonifer. | 1972 | 5070713 | |
| translocation of s 35 in rhizopus stolonifer. | 1972 | 4556581 | |
| characteristics of deoxyribonucleic acid polymerase isolated from spores of rhizopus stolonifer. | deoxyribonucleic acid (dna)-dependent dna polymerase was purified several hundredfold from germinated and ungerminated spores of the fungus rhizopus stolonifer. the partially purified enzymes from both spore stages exhibited identical characteristics; incorporation of [(3)h]deoxythymidine monophosphate into dna required mg(2+), dna, a reducing agent, and the simultaneous presence of deoxyguanosine triphosphate, deoxycytidine triphosphate, and deoxyadenosine triphosphate. heat-denatured and activ ... | 1973 | 4728271 |
| microbiological hydroxylation of steroids. vii. the pattern of dihydroxylation of mono-oxo-5 alpha-androstanes and 5 alpha-estranes with the fungus rhizopus nigricans. | 1973 | 4739028 | |
| microbiological hydroxylation of steroids. 8. the pattern of monohydroxylation of diketones and keto-alcohols derived from 5 alpha-androstane with cultures of the fungus, rhizopus nigricans. | 1973 | 4739029 | |
| lomasome development in rhizopus stolonifer sporangiospores during anaerobiosis. | 1973 | 4752340 | |
| [effect of the incubation temperature on the growth and spore formation of penicillium italicum and rhizopus nigricans treated with ionizing radiations]. | 1973 | 4777355 | |
| fungi that infect cottonseeds before harvest. | as a part of an investigation of aflatoxins and other mycotoxins in cottonseeds at harvest, samples of seeds collected from the 1971 crop at locations across the u.s. cotton belt were examined to determine the kinds of microorganisms causing internal or seed-coat infection in the field. aspergillus flavus infection was absent from all seeds examined from most areas but was present in some samples from arizona, california, and texas. fusarium spp., alternaria sp., and a. niger caused internal inf ... | 1973 | 16349975 |
| physiological and morphological correlation of rhizopus stolonifer spore germination. | sporangiospores of rhizopus stolonifer were examined at various stages of germination by scanning electron and phase-contrast microscopy. these observations were correlated with changes in spore dry weight, spore volume, respiration, and syntheses of ribonucleic acid, deoxyribonucleic acid, and protein during germination. | 1974 | 4811549 |
| purification and properties of rna polymerases i and ii from germinated spores of rhizopus stolonifer. | 1974 | 4420468 | |
| [rhizopus nigricans ehr. action of various physical factors on the weight growth of the mycelium and on uv absorption spectra of culture filtrates]. | 1974 | 4433134 | |
| synthesis of ribonucleic acids during the germination of rhizopus stolonifer sporangiospores. | 1974 | 4435301 | |
| [effect of the number of methyl groups in the progesterone molecule on its hydroxylation by rhizopus nigricans cultures]. | 1974 | 4444567 | |
| kynureninase-type enzymes of penicillum roqueforti, aspergillus niger, rhizopus stolonifer, and pseudomonas fluorescens: further evidence for distinct kynureninase and hydroxykynureninase activities. | the kynureninase-type enzymes of three fungi and one bacterium were isolated and examined kinetically for their ability to catalyze the hydrolysis of l-kynurenine and l-3-hydroxykynurenine. the phycomycete rhizopus stolonifer was found to contain a single, constitutive enzyme with km for l-3-hydroxykynurenine and l-kynurenine of 6.67 times 10-minus 6 and 2.5 times 10-minus 4 m, respectively. the ascomycetes aspergillus niger and penicillium roqueforti each contain an enzyme, induced by l-tryptop ... | 1975 | 164432 |
| study of atmospheric fungi in a big cereal silo over a period of one year. | a quantitative and qualitative study of the atmospheric fungi in a big silo was carried out over a period of one year (april 1973--april 1974). about 6 to 12 petri dishes with czapek medium were exposed for 5 minutes every month at different floors of the silo. the study showed:--a very high number of fungi colonies, reaching as many as 903 in march 1974 (a total of 60 min exposure); the dominant fungus was penicillium which was, however, overpassed in certain months by aspergillus (flavus and f ... | 1975 | 810877 |
| the 11alpha and 17alpha-progesterone hydroxylases of rhizopus nigricans nrrl 1477. | differential induction of cultures of rhizopus nigricans indicated that hydroxylation of progesterone at the 11alpha- and 17alpha-positions is due to two separate enzymes. this is supported by the finding that 11alpha- and 17alpha-hydroxylating activities are separated by differential centrigufation of cell-free extracts. the feasibility of introducing a hydroxyl group at the 11alpha- or 17alpha-position of hydroxylated progesterone derivatives was tested. | 1975 | 1114928 |
| toxigenic fungi in food. | forty-five fungal isolates from moldy supermarket foods were tested for toxicity to brine shrimp, and twenty-two of these isolates were subsequently tested for toxicity to chicken embryos. highly toxigenic fungi were cladosporium sphaerospermum from a bakery product, fusarium oxysporum from carrots, f. solani from cabbage, aspergillus niger and penicillium corylophilum from bread, p. cyclopium and p. herguei from corn meal, p. lanosum from onions,p. steckii from chocolate syrup, penicillium sp. ... | 1975 | 1147614 |
| microbiological hydroxylation. part xvi. incubation of derivatives (mainly acetals) of 5alpha-androstane ketones with the fungi calonectria decora, aspergillus ochraceus, and rhizopus nigricans. | 1975 | 1172504 | |
| studies of the invasion of carrot root parenchyma by rhizopus stolonifer lind. | 1975 | 1186134 | |
| microbiological hydroxylation. part xxi. hydroxylations of 3-halogeno-17-oxo-, 3-halogeno-7-oxo-, and 17-halogeno-3-oxo-androstanes by the fungi calonectria decora, rhizopus nigricans, and aspergillus ochraceus. | 1975 | 1239450 | |
| possible role of solar radiation on the viability of some air fungi in egypt. | the high occurrence of alternaria humicola and the moderate occurrence of stemphylium verruculosum, rhizopus nigricans, and epicoccum nigrum in the air of egypt could be correlated to their apparent resistance to solar radiation. cladosporium herbarum, aspergillus niger, and penicillium oxalicum, although highly occurring, were light-sensitive. the miniumum solar radiation in november, coupled with the highest total fungal catch, dominated by cladosporium herbarum, reveals the importance of sola ... | 1976 | 1037050 |
| effect of cadmium on fungi and on interactions between fungi and bacteria in soil: influence of clay minerals and ph. | fungi (rhizopus stolonifer, trichoderma viride, fusarium oxysporum f. sp. conglutinans, cunninghamella echinulata, and several species of aspergillus and penicillium) tolerated higher concentrations of cadmium (cd) when grown in soil than when grown on laboratory media, indicating that soil mitigated the toxic effects of cd. in soil amended with clay minerals, montmorillonite provided partial or total protection against fungistatic effects of cd, whereas additions of kaolinite provided little or ... | 1977 | 18085 |
| a possible role of cytochrome p-450 in hydroxylation of progesterone by rhizopus nigricans. | 1977 | 843352 | |
| a study on fungal radioresistance and sensitivity. | lower doses of gamma and x-rays (5 and 1 krad, respectively) stimulated the spore germination and growth of 7 tested fungi. higher doses (500 and 100 krad, respectively) revealed that epicoccum nigrum was the most radioresistant, while alternaria humicola, stemphylium verruculosum, rhizopus nigricans, and cladosporium herbarum were of moderate resistance. aspergillus niger and penicillium oxalicum were the most radiosensitive. protein and polysaccharide synthesis were inhibited in the mycelium d ... | 1977 | 857505 |
| aflatoxin production by aspergillus parasiticus in a competitive environment. | aspergillus parasiticus nrrl 2999 was grown in the presence of rhizopus nigricans, saccharomyces cerevisiae, acetobacter aceti, or brevibacterium linens and aflatoxin concentration was determined after 3,5,7, and 10 days of incubation at 28c. r. nigricans and s. cerevisiae inhibited growth and aflatoxin production by a. parasiticus. b. linens caused slight inhibition and a. aceti stimulated growth and aflatoxin production by a. parasiticus. | 1977 | 339094 |
| [moulds of bakery dusts (author's transl)]. | a total of 260 samples from bakery dusts were investigated. the samples were taken in the great part with the sedimentation-method. a large concentration of moulds was found in the meal-room. the fungal flora was here charcterized by species of rhizopus nigricans, mucor and circinella. with a new volumetric sampler a total quantity of 8 680 fungus spores of particles in 1 m3 was registrated. by a re-examination we found 4473. in the baker's rooms besides moulds (aspergillus, penicillium etc.) th ... | 1977 | 558701 |
| fungal antigens as a source of sensitization and respiratory disease in scottish maltworkers. | mycological and serological studies were carried out as part of a survey of respiratory disease in scottish maltworkers. 70% of stained sputum smears from 574 workers showed the presence of higher plant cells and/or myclelia, and the spores of common environmental fungi. penicillium spp. (90%), rhizopus stolonifer (48%) and yeasts (53%) were the dominant fungi in 699 sputum cultures, and showed a similar proportional distribution in 327 samples of grain, malt, culms and dusts from fifty-six malt ... | 1977 | 589785 |
| inducibility of progesterone hydroxylating enzymes in rhizopus nigricans. | 1978 | 642505 | |
| molds on vegetables at the time of harvest. | the mean numbers of colony-forming units of molds present on vegetables at the time of harvest were in the range of 4.2 x 10(3) to 6.7 x 10(3)/g for all vegetables except cucurbits and asparagus. the numbers were not influenced by cultivars within species, duration of the growing season, distant separation of the growing fields, or elevation above ground. numbers increased with rainfall during either of 3 days before harvest and decreased when the mean daily temperature exceeded 24 degrees c. th ... | 1978 | 646353 |
| viability of spores after repeated freezing and thawing shocks. | survival of spores of the fungus rhizopus nigricans after repeated freezing and thawing was investigated. the cooling rate was 10(4) degrees c/min. dry spores were fully inactive after 32 repeated shocks. about one-half of spores were killed after 8 repetitions. the water content did not change the resistance, swollen spores reacted to shocks much like dry ones. the sensitivity of spores to freezing-thawing shocks increased considerably when the spores changed from the dormant to the active stat ... | 1978 | 648975 |
| efficacy of some essential oils and their constituents on few ubiquitous molds. | six essential oils of mentha arvensis, mentha piperita, anethum sowa, cymbopogon winterianus, nardostachys jatamansi, and commiphora mukul were selected and tested for their efficacy against aspergillus flavus, a. fumigatus, a. sulphureus, mucor fragilis, and rhizopus stolonifer. these oils were fungistatic or fungicidal to one or the other molds, depending upon the concentrations. | 1978 | 749414 |
| purification and properties of an elicitor of castor bean phytoalexin from culture filtrates of the fungus rhizopus stolonifer. | evidence has been obtained for the presence in filtrates of 3-day-old cultures of the fungus rhizopus stolonifer grown on potato-dextrose medium of both high molecular weight and low molecular weight elicitors of the production of the phytoalexin casbene in cell-free extracts of castor bean (ricinus communis l.) seedlings. the high molecular weight elicitor activity was purified by means of gel filtration chromatography. both protein and carbohydrate are associated with the most purified fractio ... | 1978 | 16660233 |
| biosynthesis of the diterpene phytoalexin casbene: partial purification and characterization of casbene synthetase from ricinis communis. | casbene synthetase from 67-hour seedlings of ricinis communis l. which had been treated with rhizopus stolonifer spores was purified 700-fold by a combination of ammonium sulfate fractionation, qae a-50 sephadex chromatography, and g-100 sephadex chromatography. polyacrylamide disc gel electrophoresis revealed that the purified fraction was heterogeneous. no casbene synthetase was detected in extracts of seedlings which had not been exposed to the fungal spores; maximum activity was obtained fro ... | 1978 | 16660566 |
| diterpene biosynthesis in maize seedlings in response to fungal infection. | a cell-free system which catalyzes the biosynthesis of terpene hydrocarbons when supplemented with mevalonate, mn(2+), and atp was prepared from the scutellum-embryonic axis region of maize seedlings. the capacity of this system for the production of terpene hydrocarbons was enhanced 50- to 100-fold when the seedlings were exposed for 48 hours to the fungus rhizopus stolonifer prior to tissue homogenization. the fungi aspergillus niger, fusarium moniliforme, and verticillium albo-atrum also elic ... | 1979 | 16660976 |
| dichloran-rose bengal medium for enumeration and isolation of molds from foods. | overgrowth by spreading molds such as rhizopus and mucor species is a problem with fungal enumeration media used for foods. thirty-one antifungal compounds were surveyed for their ability to selectively inhibit such fungi while allowing growth of mycotoxigenic molds and other species of significance in food spoilage. dichloran (2,6 dichloro-4-nitroaniline) restricted growth of rhizopus stolonifer while allowing satisfactory growth of the other test molds. three rhizopus and mucor species were en ... | 1979 | 485140 |
| ultrastructure of spores of rhizopus nigricans after repeated freezing and thawing shocks. | disintegration of nuclear envelopes is the only ultrastructural change detectable by freeze-etching in dormant spores of the mould rhizopus nigricans, both dry and swollen, subjected to repeated freezing and thawing. the increase of the number of freeze-inactivated spores corresponds well with the increase of the number of damaged nuclei. this fact led us to formulate a hypothesis that the structure of the nucleus is the primary target of the freezing or thawing damage. as other biomembranes are ... | 1980 | 7399373 |
| inducibility of cytochrome p-450 and of nadph-cytochrome c reductase in progesterone treated filamentous fungi rhizopus nigricans and rhizopus arrhizus. | 1981 | 6785529 | |
| polygalacturonase from rhizopus stolonifer, an elicitor of casbene synthetase activity in castor bean (ricinus communis l.) seedlings. | apparently homogeneous polygalacturonase-elicitor purified from the filtrates of rhizopus stolonifer cultures stimulates germinating castor bean seedlings to produce greatly increased levels of casbene synthetase activity. the purification procedure involved gel-filtration chromatography on sephadex g-25 and g-75 columns followed by cation-exchange chromatography on a sephadex cm c-50 column. homogeneity of the purified preparation was indicated by the results of cationic polyacrylamide disc gel ... | 1981 | 16661728 |
| properties of rhizopus stolonifer polygalacturonase, an elicitor of casbene synthetase activity in castor bean (ricinus communis l.) seedlings. | some properties of the polygalacturonase-elicitor from the filtrates of rhizopus stolonifer cultures have been examined in an attempt to understand its mode of action as an elicitor of casbene synthetase activity in castor bean seedlings. both the polygalacturonase activity and the elicitor activity are heat-labile with similar heat-sensitivity profiles. also, the catalytic activity of the enzyme is lost on treatment with sodium periodate, as had been shown previously for the elicitor activity. ... | 1981 | 16661729 |
| elicitation of casbene synthetase activity in castor bean : the role of pectic fragments of the plant cell wall in elicitation by a fungal endopolygalacturonase. | endopolygalacturonase isolated from culture filtrates of the fungus rhizopus stolonifer was shown previously to act as an elicitor of biosynthetic capacity for the antifungal agent, casbene, in castor bean (ricinus communis l.) seedlings (s.-c. lee, c.a. west 1981 plant physiology 67:633-639). selective amidation of exposed carboxyl groups of the pure fungal endopolygalacturonase using intermediate activation with a water-soluble carbodiimide under mild conditions leads to inactivation of its en ... | 1982 | 16662367 |
| aflatoxin and aflatoxicosis. i. fungal flora of some food and animal feeds with special references to aflatoxin-producing abilities. | a wide range of fungi, amounting to fifty-six species belonging to twenty-two genera, have been recovered from animal feeds and foodstuffs. the most frequent fungi were aspergillus niger, and a. flavus, followed by mucor racemosus, alternaria alternata. rhizopus stolonifer, penicillium corylophilum and p. notatum. three genera were found to be of moderate occurrence, namely, mucor, rhizopus and alternaria. the three following genera were of low occurrence: cladosporium, fusarium, and neurospora. ... | 1982 | 7070483 |
| solubilization and separation of microsomal cytochrome p-450 and nadph-cytochrome c reductase of rhizopus nigricans. | 1983 | 6408312 | |
| d-homoandrostanes. 4. the incubation of some d-homo-5 alpha-androstanes with rhizopus nigricans. | nine dioxygenated d-homoandrostanes were incubated with rhizopus nigricans to investigate the effect of d-ring modification on microbiological hydroxylation. structure determination of the products by nmr spectroscopy, and in certain cases independent synthesis of their oxidised products, showed that in contrast to 5 alpha-androstanes the majority of the compounds were hydroxylated in the "reverse" mode, and only d-homo-5 alpha-androstane-3,17-dione was hydroxylated in the "normal" mode to any e ... | 1983 | 6658861 |
| composition of the fungal flora of four cereal grains in saudi arabia. | using the grain-plate method and on glucose- czapek 's agar at 28 degrees c, fifty-eight species belonging to 26 genera were collected from barley (42 species and 19 genera), maize (29 species and 16 genera), sorghum (32 species and 17 genera) and wheat grains (42 species and 18 genera). the most frequent genera were aspergillus, penicillium, rhizopus, fusarium, and mucor followed by alternaria, drechslera , and curvularia. from the preceding genera aspergillus flavus, a. niger, penicillium nota ... | 1984 | 6727980 |
| characteristics of galacturonic acid oligomers as elicitors of casbene synthetase activity in castor bean seedlings. | partial digestion of polygalacturonic acid with polygalacturonase isolated from rhizopus stolonifer produces a mixture of alpha-1,4-d-galacturonide oligomers which act to elicit casbene synthetase activity in castor bean (ricinus communis l). these oligomers were separated by anion exchange chromatography on deae sephadex a-25 into discrete sizes and their degrees of polymerization were analyzed by fast atom bombardment mass spectrometry. a minimum degree of polymerization of nine units appears ... | 1984 | 16663547 |