Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| [thermostability of certain indices of viability in the plasmodium physarum polycephalum]. | 1973 | 4798696 | |
| dna-membrane association during the mitotic cycle of physarum polycephalum. | 1973 | 4798701 | |
| isolation of ribosomal rna precursors from physarum polycephalum. | 1973 | 4798900 | |
| nuclear dna content and chromosome numbers in the myxomycete physarum polycephalum. | 1973 | 4799477 | |
| nuclear dna content and senescence in physarum polycephalum. | 1973 | 4518990 | |
| phospholipids and phospholipase d in the true slime mold physarum polycephalum. | 1973 | 4352920 | |
| studies on the biosynthesis of cytochrome c. | a soluble cytochrome was isolated and purified from the slime mould physarum polycephalum and identified as cytochrome c by room-temperature and low-temperature (77 degrees k) difference spectroscopy. a close similarity between p. polycephalum and mammalian cytochromes c was suggested by a comparison of the initial rates of oxidation of both proteins by mammalian mitochondria. this similarity was further emphasized by redox titrations and gel-electrophoretic studies which indicated that p. polyc ... | 1973 | 4353090 |
| purification and properties of cytoplasmic and mitochondrial malate dehydrogenases of physarum polycephalum. | two isoenzymes of malate dehydrogenase (mdh) were demonstrated in plasmodia of physarum polycephalum by polyacrylamide-gel electrophoresis. the more "cathodal" form was uniquely associated with mitochondria (m-mdh) and the other form was found in the soluble cytoplasm (s-mdh). the isoenzymes were separated by acetone fractionation of soluble plasmodial homogenates acidified to ph 5.0. the m-mdh was purified 201-fold by cetylpyridinium chloride treatment, fractionation with ammonium sulfate, grad ... | 1973 | 4355490 |
| the electron-transport system of mitochondria from the slime mould physarum polycephalum. | a method is described for the preparation of mitochondria from the slime mould physarum polycephalum; the mitochondria were not coupled. p. polycephalum mitochondria oxidized added nadh via a rotenone-insensitive pathway, but the oxidation of malate plus glutamate was rotenone sensitive; both of these substrates reduced much less cytochrome b than did succinate, in both aerobic and anaerobic steady states. spectroscopy at 77 degrees k separated three absorption maxima in the alpha-band region, a ... | 1973 | 4356125 |
| phosphorylation of very-lysine-rich histone in physarum polycephalum. correlation with chromosome condensation. | 1973 | 4570762 | |
| annular structures in isolated nuclei of physarum polycephalum. | 1973 | 4587742 | |
| changes in the activity of selected enzymes during starvation of physarum polycephalum. | 1974 | 4362961 | |
| purification and properties of two rna polymerases from physarum polycephalum. | two rna polymerases have been purified from the slime mold physarum polycephalum, one sensitive and one resistant to alpha-amanitin. both enzymes are more active with denatured dna than native dna as a template and prefer mn(++) rather than mg(++) as a divalent cation. the alpha-amanitin-sensitive enzyme shows maximum activity at 0.15 m kcl, whereas the resistant enzyme is most active at very low ionic strength. analysis of the resistant enzyme on polyacrylamide gels containing sodium dodecyl su ... | 1974 | 4524629 |
| reassociation kinetics of nuclear dna from physarum polycephalum. | 1974 | 4599836 | |
| scanning electron microscopy of freeze-fractured sclerotia of physarum polycephalum. | 1974 | 4607050 | |
| plasmalemma invaginations as characteristic constituents of plasmodia of physarum polycephalum. | 1974 | 4608528 | |
| somatic incompatibility following plasmodial fusion between strains of the myxomycete physarum polycephalum: the effect on their nuclei. | 1974 | 4615132 | |
| purification and properties of deoxyribonucleic acid-dependent ribonucleic acid polymerases from the slime mold physarum polycephalum. | 1974 | 4856363 | |
| metabolism during differentiation in the slime mold physarum polycephalum. | 1974 | 4856670 | |
| activity of uridine diphosphate n-acetylglucosamine-4-epimerase during spherulation of physarum polycephalum. | the specific activity of uridine diphosphate n-acetylglucosamine-4-epimerase increases during spherulation of physarum polycephalum, a process that involves the synthesis of galactosamine walls. this increase is prevented by the addition of cycloheximide. | 1974 | 4857193 |
| effects of supraoptimal temperatures on the myxomycete physarum polycephalum. 3. effects of starvation and cycloheximide on repair on thermal injury in plasmodia. | 1974 | 4857810 | |
| induction of somatic fusion and heterokaryosis in two incompatible strains of physarum polycephalum. | 1974 | 4859361 | |
| isolation of adenylate-rich rna from physarum polycephalum. | 1974 | 4859376 | |
| effects of supraoptimal temperatures on the myxomycete physarum polycephalum. ii. effects on the rate of protein and ribonucleic acid synthesis. | 1974 | 4134518 | |
| studies on the regulation of carbohydrate synthesis during growth and differentiation of physarum polycephalum. i. activity of udpgpyrophosphorylase during spherulation. | 1974 | 4136207 | |
| studies on mitochondrial structure and function in physarum polycephalum. iii. electron microscopy of a large amount of dna releases from a central body in mitochondria by trypsin digestion. | 1974 | 4138519 | |
| activities of dna degrading enzymes in the slime mold physarum polycephalum. evidence for five different enzymes. | 1974 | 4209281 | |
| dna replication continued in isolated nuclei of synchronously growing physarum polycephalum. | 1974 | 4218840 | |
| physical separation of nuclei from two independent plasmodia of physarum polycephalum after fusion. | 1974 | 4407050 | |
| continuous nucleolar dna synthesis in late-interphase nuclei of physarum polycephalum after transplantation into post-mitotic plasmodia. | 1974 | 4407322 | |
| analysis of isoaccepting trnas during the growth phase mitotic cycle of physarum polycephalum. | 1974 | 4471998 | |
| ultrastructural effects of griseofulvin on the myxomycete physarum polycephalum. inhibition of mitosis and the production of microtubule crystals. | 1974 | 4472522 | |
| change in properties of physarum polycephalum amoebae during extended culture. | during two years of passage, several myxamoebal strains of physarum polycephalum changed with regard to their properties in crosses and plaque morphology. these changes have been correlated with increased nuclear deoxyribonucleic acid content. | 1974 | 4472784 |
| the rapid intranuclear accumulation of preexisting proteins in response to high plasmodial density in physarum polycephalum. | 1974 | 4473038 | |
| plasmodium formation without change in nuclear dna content in physarum polycephalum. | 1974 | 4474107 | |
| uridine diphosphoglucose pyrophosphorylase activity and differentiation in the cellular slime mold physarum polycephaluno. | the specific activity of uridine 5'-triphosphate:alpha-d-glucose 1-phosphate uridyltransferase (ec 2.7.7.9) (also called uridine 5'-diphosphate [udp]-glucose pyrophosphorylase) has been found to increase up to eightfold during spherule formation by the slime mold physarum polycephalum. the enzyme accumulates during the first 8 to 9 h after initiation of spherule formation, declines to basal levels found in vegetative microplasmodia by 15 h, and is undetectable in completed spherules. specific ac ... | 1974 | 4474161 |
| a method of indirect mutant selection in physarum polycephalum using the antibiotic netropsin. | 1974 | 4474585 | |
| cycloheximide induced in vivo modification of ornithine decarboxylase in physarum polycephalum. | 1974 | 4474953 | |
| letter: sites of dna synthesis in the mitochondria of physarum polycephalum as revealed by electron microscopic autoradiography. | 1974 | 4475081 | |
| the preparation and preliminary characterisation of chromatin from the slime mould physarum polycephalum. | 1974 | 4475636 | |
| methods for the isolation and analysis of plasmodial mutants in physarum polycephalum. | 1974 | 4476673 | |
| studies on the mechanism of dna replication in physarum polycephalum. | 1974 | 4476802 | |
| genetic analysis in the colonia strain of physarum polycephalum: heterothallic strains that mate with and are partially isogenic to the colonia strain. | amoebae of the colonia (cl) strain, which normally produce plasmodia in clones, are shown to cross with mt3 and mt4 amoebae under appropriate conditions. strains carrying mt3 and mt4 in a cl genetic background were constructed and used in the genetic analysis of mutants isolated in cl. | 1974 | 4477090 |
| the amount of dna coding for rrna during differentiation (spherulation) in physarum polycephalum. | 1974 | 4477484 | |
| [the effect of heating the plasmodium physarum polycephalum on incorporation of the precursors of protein and rna synthesis in vivo]. | 1974 | 4478032 | |
| activity, isoenzyme pattern, and synthesis of udpglucose 4-epimerase during differtiation of physarium polycephalum. | 1. the specific activity of udpglucose 4-epimerase (ec 5.1.3.2) increases by about 50% during the first 24 h of starvation-induced differentiation (spherulation) of physarum polycephalum. 2. at all stages during differentiation, the enzyme activity is very sensitive to actinomycin-c and cycloheximide, inhibitors of transcription and translation, with a half life against cycloheximide of about 20 min (if added 12 h after the induction of differentiation). 3. the isoenzyme pattern, as revealed by ... | 1975 | 47762 |
| demonstration of cytoplasmic actomyosin fibrils by the freeze-etching technique. | cytoplasmic actomyosin fibrils of physarum polycephalum were demonstrated by the freeze-etching technique. within the fibrils the electron micrographs reveal 40-80 a thick filaments presumably representing f-actin. thicker filaments (myosin) could not be detected. to avoid freezing artefacts, a pretreatment of the living material with 50% sucrose was necessary. the influence of freeze-protecting agents upon the fine structure of cytoplasmic actomyosins and the resulting difficulties in the inves ... | 1975 | 51462 |
| threshold phenomena in chemoreception and taxis in slime mold physarum polycephalum. | the plasmodium of physarum polycephalum reacts to various kinds of chemicals substances and moves towards or away from them. threshold concentration of recognition of chemicals was examined in terms of membrane potential and of the averaged motive force of tactic movement by using a double-chamber method, i.e., a single plasmodium was placed between two compartments through a narrow ditch, and differences in membrane potential and in pressure between two compartments were measured. results are s ... | 1975 | 163890 |
| calcium sensitivity of hybrid complexes of muscle myosin and physarum proteins. | 1. a myosin-actin hybrid complex was used to study actin-associated calcium sensitivity of a "cytoplasmic" actomyosin. the approach should be generally applicable. 2. low salt extracts of physarum polycephalum contain actin which remains in solution after centrifugation at 46 000 times g or at 100 000 times g for 1 h. the actin was precipitated by the addition of muscle myosin to the supernatants and detected in the hybrid complex by electron microscopy, sodium dodecyl sulfate gel analysis, supe ... | 1975 | 126082 |
| ca2+-sensitivity of actomyosin atpase purified from physarum polycephalum. | a contractile protein closely resembling natural actomyosin (myosin b) of rabbit skeletal muscle was extracted from plasmodia of the slime mold, physarum polycephalum, by protecting the sh-groups with beta-mercaptoethanol or dithiothreitol. superprecipitation of the protein induced by mg2+-atp at low ionic strength was observed only in the presence of very low concentrations of free ca2+ ions, and the mg2+-atpase [ec 3.6.1.3] reaction was activated 2- to 6-fold by 1 mum of free ca2+ ions. crude ... | 1975 | 131790 |
| two forms of beta-n-acetylhexosaminidase from physarum polycephalum. | 1975 | 236942 | |
| proceedings: enzymes degrading poly(adp-ribose) from physarum polycephalum and nicotiana tabacum. | 1975 | 237001 | |
| a calcium ion-dependent atp pyrophosphohydrolase in physarum polycephalum. | an activity of atp pyrophosphohydrolase (ec 3.6.1.8) was found in the soluble fraction of the plasmodium of physarum polycephalum. the products of the enzyme reaction were inorganic pyrophosphate and 5'-amp in equimolar quantities. the enzyme had a pronounced requirement for ca2+ with high specificity. mg-2+ was not an essential cofactor but stimulated the enzyme activity about 2.5-fold of the control. the enzyme hydrolyzed itp, gtp and beta,gamma-methylene atp at a limited rate. among inhibitor ... | 1975 | 238634 |
| poly(adenosine diphosphate ribose) polymerase in physarum polycephalum. | 1. the isolated nuclei of the slime mould physarum polycephalum contain an enzyme that will incorporated [adenine-3h] nad+ into an acid-insoluble product, which is shown to be poly(adp-ribose). 2. this incorporation has an optimum ph of 8.2 and a temperature optimum below 10degreesc. 3. optimum stimulation is given by 15 mm-mg2+. 4. 2-mercaptoethanol or dithiothreitol also stimulates the incorporation, the latter at an optimum concentration of about 1 mm. 5. under optimum conditions the km value ... | 1975 | 239697 |
| effects of cordycepin on rna sythesis in physarum polycephalum. | 1975 | 1079713 | |
| contractile proteins. major components of nuclear and chromosome non-histone proteins. | two of the major non-histone proteins from physarum polycephalum have been isolated under nondenaturing conditions and identified as actin and myosin. a third protein has been purified from crude nuclear actomyosin and from residual nonhistone fractions and found to bind actomyosin in the presence of mg2+. in physarum these proteins are not components of the nuclear membrane. based on sodium dodecylsulfate-polyacrylamide gel electrophoresis, similar proteins are also present in nuclei of hela ce ... | 1975 | 1091294 |
| ribosomal rna genes in the amoebal and plasmodial forms of the slime mould physarum polycephalum. | 1. the degree of homology between ribosomal rna isolated from microplasmodia and amoebae of the slime mould physarum polycephalum has been determined by competive hybridisation of the rna from the two sources to homologous dna in solution. the extent of competition was measured both by hybridisation to saturation and by following the kinetics of hybrid formation. in each case competition was found to be 100%, indicating that the ribosomal rnas from the two, quite different vegetative forms of th ... | 1975 | 1097245 |
| [modern research on the cell cycle and mitosis in the myxomycete physarum polycephalum]. | the plasmodial stage of physarum polycephalum contains up to 10(9) nuclei which undergo a naturally synchronous mitosis every 8 h. nuclear processes such as dna and rna synthesis as well as many cytoplasmic processes such as histone synthesis are also synchronous. physarum polycephalum is therefore widely used in studies of cell-cycle events. this article describes experiments that may help to explain two fundamental biological processes: (1) the mechanism that triggers mitosis, (2) the structu ... | 1975 | 1105201 |
| mitotic delay in the slime mould physarum polycephalum induced by low intensity 60 and 75 hz electromagnetic fields. | 1975 | 1167627 | |
| covalent linkage between rna and nascent dna in the slime mold, physarum polycephalum. | when alpha--32 p-labeled deoxyribonucleoside triphosphates are injected into plasmodia of the eukaryotic slime mold, physarum polycephalum, they are incorporated initially into strands of dna which are mostly less than 300 nucleotides long. sixty minutes after injection incorporated deoxyribonucleoside triphosphates are found in much longer strands. if the short strands found two minutes after injection are denatured and centrifuged to equilibrium in a cs(2)so(4) density gradient, they migrate t ... | 1975 | 1168504 |
| mating type and the differentiated state in physarum polycephalum. | 1975 | 1168600 | |
| some evidence for replication-transcription coupling in physarum polycephalum. | hydroxyurea, at concentrations of 40-60 mm, selectively and effectively blocked incorporation of thymidine into dna. inhibition occurred within 5-10 min of application of the agent when dna synthesis was in progress, while the onset of replication at the beginning of s-phase and dna synthesis in g2 phase were not affected. uridine incorporation into tca-precipitable material, in the presence of hydroxyurea, was significantly (up to 70%) inhibited in early s-phase of the cell cycle. selective inh ... | 1975 | 1170185 |
| sporulation-inducing factor in slime mould physarum polycephalum. | 1975 | 1170501 | |
| the effect of alfalfa saponins on growth and lysis of physarum polycephalum. | the prelytic events associated with the interaction of saponins with physarum polycephalum membrane components were studied. it was found that alfalfa saponins form interaction products with membranal sterols, proteins and phospholipids. the interaction of saponins with proteins affect also certain membranal enzymic activities such as nadh oxidase and malate dehydrogenase. it is suggested that although the interaction of the saponin with sterols is much more specific than with other membranal co ... | 1975 | 1171667 |
| [structure and histone composition of chromatin in physarum polycephalum]. | in physarum polycephalum several degrees of organisation of deoxyribonucleoprotein fibres were found. the complexes of histones and the dna duplex seem to "be packed" at first into a 100 a fibre and then into a 200 a fibre of dnp. in ph. polycephalum the electrophoretic mobilities of histone fractions 4 and 6 are comparable to that of fractions f3/f2b and f2a1 of calf thymus, resp. histone fractions 3 and 5 move a bit faster than fractions f1 and f2a2, resp. thus, the myxomycete p. polycephalum ... | 1975 | 1172312 |
| nuclear phosphoproteins of physarum polycephalum. characterization and phosphorus content of the phenol-soluble nuclear acidic proteins. | 1975 | 1172412 | |
| thermotaxis in a slime mold, physarum polycephalum. | 1975 | 1172434 | |
| dna replication by a possible continuous-discontinuous mechanism in homogenates of physarum polycephalum containing dextran. | nuclear dna synthesis in homogenates of physarum is greatly stimulated by the presence of dextran in the homogenizing medium. in this cell-free system, the dna precursor is incorporated approximately equally into two classes of dna intermediates. on of these is similar in size to that observed previously in the intact organism, i.e. its sedimentation rate in alkaline sucrose density gradients increases, presumably by chain elongation, as the organism progresses through the s phase. the other cla ... | 1975 | 1172449 |
| aminopeptidases of physarum polycephalum. activity, isoenzyme pattern, and synthesis during differentiation. | in extracts from both growing and differentiating (spherulating) plasmodia of the true slime mold physarum polycephalum, high aminopeptidase activities were found. the specificity of the aminopeptidases changed during differentiation with a higher relative activity towards hydrophobic nh2-terminal amino acids. this change in specificity was found to be the result of a shift in the isoenzyme spectrum during differentiation as was tested by isoelectric focusing in sucrose gradients. three differen ... | 1975 | 1172502 |
| life cycle variants of physarum polycephalum that lack the amoeba stage. | 1975 | 1172631 | |
| circular dna and rolling circles in nucleolar rdna from mitotic nuclei of physarum polycephalum. | 1. about 15% of nucleolar dna (1.712 g/cm3) from physarum polycephalum displaying maximum hybridization to ribosomal rna, is composed of circular dna of 3.9 +/- 0.2 mum contour length or multiples thereof. 2. a portion of these circular molecules (25%) contained linear dna pieces longer than circumference length. in a small fraction of circular dna linear pieces, shorter than the unit length, were observed. 3. most nucleolar dna, [3h]thymidine-labeled or hybridizable to ribosomal rna was separab ... | 1975 | 1236803 |
| dna breakage caused by dimethyl mercury and its repair in a slime mould, physarum polycephalum. | 1975 | 1237092 | |
| dna replication in physarum polycephalum: characterization of replication products in vivo. | synchronous plasmodia of physarum polycephalum in dna synthesis were pulse-labelled with [oh]- thymidine for time periods of 15 seconds up to 9 minutes, or given a 30 seconds pulse followed by chase periods of 9 minutes up to 6 hours. sedimentation analysis in alkaline sucrose gradients revealed at least five species of single stranded dna14 molecules in the pulse experiments. co-sedimentation of [14c]-labelled phage-dna gave relative s-values of 5-7, 13-15, 23-25, 30 and 33-35 for these dna mol ... | 1975 | 1237130 |
| premature replication of late s period dna regions in early s nuclei transferred to late s cytoplasm by fusion in physarum polycephalum. | fusion of a late s period plasmodium of physarum polycephalum to an early s period plasmodium causes premature replication of late s replicating regions in the nuclei of the early s plasmodium. the extent of ahead-of-schedule replication of late s replicating regions in early s period nuclei increases to a plateau of 16-20% for fusions with 40-70 min of phase difference, then declines for larger phase differences. the stimulatory factors for late s replicative units are present only in late s pl ... | 1975 | 1237322 |
| transmission and scanning electron microscopy of changes associated with microcyst formation in the myxamoebae of physarum polycephalum. | surface and internal changes associated with transition from myxamoebal to microcyst stages in physarum polycephalum have been observed with transmission and scanning electron microscopy. nuclear morphology, granules studded with ribosomal-like particles, synthesis of polysaccharides which are deposited exterior to the cell, and origin of material for the cell wall appear to be similar in the amoeba and in the plasmodium. in addition, the viability of the strain used in this research after being ... | 1975 | 1237391 |
| coordination of macromolecular synthesis in the slime mould physarum polycephalum. | microplasmodia of p. polycephalum were grown either in batch culture, in both complex and defined media to give a 3-4 fold variation in growth rate, or in a chemostate. the protein/dna ratio of batch cultures was almost invariant, whilst the rna/dna ratio increased as a non-linear function of growth rate. the amount of ribosomal rna, expressed as a fraction of total rna, showed little variation and this was also true for the proportion of ribosomes found in polyribosomes. calculation of the rat ... | 1975 | 1237783 |
| [physarum polycephalum-the model for biochemical investigations of the cell cycle (author's transl)]. | 1975 | 1237883 | |
| fluctuations in deoxyribo- and ribonucleoside triphosphate pools during the mitotic cycle of physarum polycephalum. | fluctuations in the pools of deoxyribo- and ribonucleoside triphosphates have been measured during the synchronous mitotic cycle of the slime mould physarum polycephalum. the most pronounced fluctuation of the deoxyribonucleoside triphosphates was seen shortly before and after initiation of dna synthesis. the pools of dttp, datp, dctp and dgtp expanded before initiation of dna synthesis and decreased again in early s phase. the pools of ribonucleoside triphosphates increased during mitosis and a ... | 1975 | 1238125 |
| the control of mitosis in physarum polycephalum. the effect of lowering the dna: mass ratio by uv irradiation. | 1975 | 1238278 | |
| calcium and magnesium contents of ectoplasm and endoplasm of physarum polycephalum plasmodium. | 1975 | 1239055 | |
| the amoebal cell of physarum polycephalum: colony formation and growth. | 1975 | 1239390 | |
| the mitotic oscillator in physarum polycephalum. | 1975 | 1239646 | |
| differential expression of rnase activities in the life cycle of physarum polycephalum. | 1975 | 1240600 | |
| [heat resistance of 2 types of protoplasmic movement in physarum polycephalum plasmodia]. | the thermostabilities of the "unordered" and shuttle protoplasmic streamings in myxomycete physarum polycephalum plasmodia was studied. a comparison of these thermostabilities has revealed that the cessation of the former streaming occurs at temperatures higher than those required for arresting the shuttle streaming. the difference between the two types of protoplasmic streamings is better seen in the rate of repair of protoplasmic streaming halted by a 10 minutes heating at 38-41 degrees c. for ... | 1975 | 1241623 |
| ultrastructural studies of chondromyces crocatus vegetative cells. | electron microscopy of sectioned, chemically fixed chondromyces crocatus revealed a microorganism with a typical gram-negative cell envelope. the cytoplasm contained, in addition to tubules and two types of granules, a membrane-associated structure (mas) that, although less extensive, bears some resemblance to polar membranes observed in flagellated bacteria. examination of swarming cells negatively stained in situ, as well as thin sections, established that cell division occurs by septum format ... | 1975 | 811346 |
| scanning electron microscopy of fruiting body formation by myxobacteria. | scanning electron microscopy was used to follow fruiting body formation by pure cultures of chondromyces crocatus m38 and stigmatella aurantica. vegetative cells were grown on sp agar and then transferred to bonner salts agar for fructification. fruiting in both species commences with the formation of aggregation centers which resemble a fried egg in appearance. in chondromyces the elevated center or "yolk" region of the aggregation enlarges into a bulbous structure under which the stalk forms a ... | 1975 | 811649 |
| dna replication in homogenates of physarum polycephalum. | homogenates of physarum polycephalum incorporate [3h]datp into nuclear dna at an initial rate of approximately 15% of the in vivo rate. to attain this level of synthesis, cultures, are homogenized in a medium containing mg++, egta, glucose and spermine. incorporation is strongly stimulated by the addition of atp and all four deoxyribonucleoside triphosphates to homogenates prior to incubation. various inorganic cations other than mg++ either do not affect synthesis or are inhibitory. incorporati ... | 1975 | 811674 |
| [demonstration of the action of methyl benzimidazole 2 yl carbamate (mcb) and methyl(5(2 thienyl carbonyl) 1 h benzimidazole 2 yl carbamate) (r17934) on the nucleus of physarum polycephalum (myxomycetes)]. | the toxicity of these compounds was determined in the amoebae and plasmodia. an electron microscopic study shows an increase in nuclear size which is in agreement with the increase of the total amount of dna. microtubules are present but they are not organized in a normal mitotic apparatus. some other nuclear abnormalities are described. | 1976 | 825247 |
| [autoradiographic study of ribosomal rna metabolism during mitosis in the myxomycete physarum polycephalum]. | in physarum polycephalum, the study of rna metabolism just after metaphasis shows an important 3h-uridine incorporation. most of the labelling is found in the nucleolus when we can see it again during interphasis. therefore a ribosomal rna synthesis does exist before any visible nucleolar structure. | 1976 | 827386 |
| cycling aggregation patterns of cytoplasmic f-actin coordinated with oscillating tension force generation. | isometric contracting protoplasmic veins of physarum polycephalum show cycling patterns of cytoplasmic f-actin, dependent on their oscillating contraction behaviour (minute rhythms). the process of fibrillogenesis represents a parallel arrangement of f-actin chains ("plasma filaments, microfilaments") during the isometric contraction phase. a part of the results of the present work corroborates previous results on stretch-activated veins which showed that the fibrillar form of f-actin reflects t ... | 1976 | 942884 |
| a method of isolation of mitochondrial nucleoid of physarum polycephalum and evidence for the presence of a basic protein. | 1976 | 942924 | |
| multiple ornithine decarboxylase forms in physarum polycephalum: interconversion induced by cycloheximide. | 1976 | 942930 | |
| adenylate cyclases in physarum polycephalum: inhibition of a nuclear enzyme by polyamines. | 1976 | 943166 | |
| control of chemotaxis in physarum polycephalum. | plasmodia migrate towards those situations which increase the frequency of their alternations in streaming, and away from those which decrease the frequency. therefore peristalsis-like waves in physarum move in the direction opposite from the net movement of the organism. the mechanism is fundamentally related to other known types of chemotaxis. | 1976 | 943401 |
| structural comparison of deoxyribonucleic acid-dependent ribonucleic acid polymerases i and ii from the slime mold physarum polycephalum. | 1976 | 944015 | |
| levels of rna polymerases during the mitotic cycle of physarum polycephalum. | two rna polymerase activities were quantitatively solubilized in plasmodial homogenates from physarum polycephalum by sonication at 0.5 m ammonium chloride concentration. the proportions of rna polymerases a and b were determined by four different methods. equal activity levels of both enzyme a and enzyme b were detected throughout the synchronous mitotic cycle of physarum. | 1976 | 944051 |
| synthesis of ribosomal rna during the mitotic cycle on the slime mould physarum polycephalum. | 1. an isotope dilution technique has been used to analyze the synthesis of metabolically stable nucleic acids during the mitotic cycle in surface plasmodia of the slime mould physarum polycephalum. microplasmodia that had been labelled with [3h]uridine were used to prepare a surface culture, after a period of growth long enough to ensure that radioactivity was present only in trna, rrna and dna. the synthesis of rrna or nuclear dna during the growth of the surface plasmodium was then followed by ... | 1976 | 944125 |
| actomyosin content of physarum plasmodia and detection of immunological cross-reactions with myosins from related species. | the content of myosin in plasmodia of the myxomycete physarum polycephalum was measured by an immunological technique, quantitative microcomplement (c') fixation. migrating plasmodia (starved after growth on rolled oats) contained 0.60 +/- 0.08 (sd) mg myosin per g fresh plasmodia. myosin comprised 0.77% +/- 0.05 (sd) of the total plasmodial protein. when total plasmodial proteins were separated by electrophoresis on sds-polyacrylamide gels, a large amount of protein appeared in a band comigrati ... | 1976 | 944188 |
| subunit structure of physarum polycephalum chromatin. | 1976 | 945190 | |
| effects of estremely low frequency electromagnetic fields on physarum polycephalum. | 1976 | 945587 |