Publications

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variation and inheritance in abnormalities occurring after conjugation in paramecium caudatum. 191516576084
the effects of fluorite ultra-violet light on the rate of division of paramecium caudatum. 191819972458
the effects of quartz ultra-violet light on the rate of division of. paramecium caudatum. 191819972457
some physiological actions of cyanides.1. the physiological actions of hcn and its salts appear to be due (a) to the ease with which hcn molecules penetrate living cells and then ionizing, exert their influence by means of h ions and cn ions; (b) to the weakness of hcn as an acid, which permits at neutrality or at even slight alkalinity the presence of a considerable amount of free hcn molecules in the presence of their salts; (c) to specific effects occasioned by its chemical activity. 2. the order of resistance of various protozoan ...192419872122
pulsation of the contractile vacuole of paramecium as affected by temperature.1. the rate of pulsation of the anterior contractile vacuole of paramecium caudatum under chloretone anesthesia has been determined over a range of temperatures from 9-31 degrees c. it has been found that the rate is a logarithmic function of the temperature according to the arrhenius equation. from 9-16 degrees the temperature characteristic (micro) has the value 25,600; from 16-22 degrees it is 18,900; and from 22-31 degrees it becomes 8,600. 2. it is concluded that there are at least three un ...192519872160
methods for the pure culture of certain protozoa.some media are described which inhibit bacterial growth, but are favorable to protozoan development. a purification technique, which takes advantage of geotropic responses, was devised and used successfully with 7 species of protozoa, including flagellates and ciliates. the method was also used with a spirillum. for one flagellate which could not be purified in this manner, a procedure involving chemical sterilization was employed. paramecium caudatum was purified, but failed to develop subseque ...193019869728
the insensitivity of paramecium to cyanide and effects of iron on respiration.1. the effects of kcn and iron salts on oxygen consumption has been studied in the cell of paramecium caudatum by manometric methods. 2. kcn solutions of strengths from m/200 to m/10,000 have been shown to produce no decrease in oxygen consumption, but have in most cases produced a very slight increase in the respiration rate. 3. the ph values were found to have little or no effect on these results. 4. iron salts produce either no effect or a great diminution of oxygen consumption, in no case ca ...193119872623
a method for determining the oxygen consumption of a single cell.1. a method for measuring the o(2) consumption of a single cell is described. the cell is placed in a capillary tube adjacent to a bubble of air. koh (5 per cent) is drawn in on the opposite side of the air and both ends of the tube are sealed with mineral oil. the decrease in the volume of the gas, representing the o(2) consumed, is followed. 2. the possible errors of the technique are appraised. 3. a single actinosphaerium eichhornii consumes 0.00113 mm.(3) of o(2) per hour. a single parameciu ...193119872589
localization of calcium in paramecium caudatum. 193817835374
the action spectrum of sensitization to heat with ultraviolet light.1. heat does not sensitize paramecia to ultraviolet light but ultraviolet light sensitizes them to heat. paramecia of two species (paramecium caudatum and p. multimicronucleate) are much more readily killed by heat at 42.3 degrees c. if they are first exposed to ultraviolet light. 2. from studies on paramecia irradiated with a given dosage at various wave lengths before being killed by heat, an action spectrum of the compound in the protoplasm being sensitized to heat can be determined. proteins ...194519873447
the influence of organic material on the action of a chloroamine on respiration and reproduction in paramecium caudatum. 194718895401
sensitization to heat by x-rays.1. paramecium caudatum is sensitized to heat by sublethal dosages of x-rays. thus if paramecia are irradiated, then exposed to a sublethal dosage of heat they are killed, but if the same heat exposure precedes the same dosage of radiations, they are not. 2. sensitivity to both heat and x-rays is much greater in paramecia from the log growth phase than in those from the stationary phase of a culture. 3. recovery from heat sensitization in animals from the stationary phase of a culture is slow, re ...194818920613
the effects of ethylalcohol on growth and respiration in pelomyxa carolinensis and upon conjugation in paramecium caudatum. 194818884196
growth of pedigreed strains of paramecium caudatum and p. aurelia on a nonliving medium. 195014791516
the position of japanese varieties of paramecium caudatum with respect to american varieties. 195014791507
investigation of the toxicity of malignant serum for the paramecium caudatum. 195014828550
glycolysis in paramecium caudatum. 195114869279
[kinetic study of galvanotropism of paramecium caudatum; electrokinesis and electro-inhibition]. 195114859668
[physiological gradients; on the axial gradient of vital staining of paramecium caudatum]. 195114867773
[influence on reproduction rate of paramecium caudatum ehrbg. by vitamin b and amino acids]. 195214951779
the metabolism of paramecium caudatum. ii. the effect of respiratory inhibitors. 195313093552
the metabolism of paramecium caudatum. i. respiration. 195313093551
demonstration of fumarase in cell-free preparations from paramecium caudatum. 195413205189
[experiments on x-irradiation of the unicellular organism paramecium caudatum; concluding remarks on the intracellular effects of roentgen rays]. 195413228212
[relation of paramecium caudatum to environmental chemism and protective effect of aggregation to inorganic substances]. 195513251296
[so-called peripheral reaction of paramecium caudatum]. 195513251295
[sexual types of paramecium caudatum; obtaining of non-conjugating strains at the expense of conjugating strains]. 195613343590
photoreversal of nuclear and cytoplasmic effects of short ultraviolet radiation on paramecium caudatum.1. irradiation with three short ultraviolet (uv) wave lengths, 226, 233, and 239 mmicro rapidly immobilizes paramecium caudatum, the dosage required being smaller the shorter the wave length. 85 per cent of paramecia immobilized with wave length 226 mmicro recover completely. recovery from immobilizing doses is less the longer the wave length. 2. irradiation continued after immobilization kills the paramecia in a manner which is markedly different for very short (226, 233, and 239 mmicro) and lo ...195613319659
[paramecium caudatum as a test-object in serodiagnosis of cancer; roskin-nastjukova's test]. 195613383628
[effect of polyethylene-glycol on paramecium caudatum and trichomonas vaginalis in experiments in vitro]. 195613419369
[sex determination among the descendants of exconjugants in paramecium caudatum type ii]. 195713479988
[study of the effect of ultrasounds on paramecium caudatum]. 195813561652
effects of kinetin on cell division in paramecium caudatum. 195813526699
sensitivity of paramecium caudatum to high oxygen tensions and its modification by cobalt and manganese ions. 195813520958
[experimental induction of a transmissible macronuclear anomaly in the paramecium caudatum using trypaflavine]. 195913629949
[changes in sexual reactivity as a function of multiplication rhythm in paramecium caudatum]. 196013781702
effect of kinetin on paramecium caudatum under varying culture conditions.when kinetin (1 mg/liter) is added to hay infusion medium, the generation time of paramecium caudatum is shortened immediately upon transfer of the protozoa from stock to isolation culture. kinetin is particularly effective when culture conditions are suboptimal, perhaps because it substitutes for or supplies some factor which becomes limiting after transfer.196013830501
[existence of inclusions with a fibrillar ultrastructure in the macronucleus of certain strains of paramecium caudatum ehr]. 196113781701
a protein factor in the nutrition of paramecium caudatum. 196113762152
experimental studies on the selection and adaptability in paramecium caudatum. 196113901360
chemotaxis in paramecium caudatum as adaptive response of organism to its environment. 196113887981
[increase, over a period of time, of sensitivity to trypaflavine in various clones of paramecium caudatum (ehr.)]. 196113869788
poison susceptibility of ciliates (paramecium caudatum ehrbg. stylonychia mytilus ehrbg.), adapted to the hypertonic medium. 196114494342
[observations on the desoxyribonucleic acid content of nuclear apparatus of ciliata: paramecium caudatum ehr]. 196213869789
[some ultrastructural aspects of micronuclear exchange from the time of conjugation in paramecium caudatum]. 196213861376
some factors influencing the photodynamic response of paramecium caudatum to 3,4-benzpyrene. 196213890448
[demonstration, with the aid of the electron microscope, of cytoplasmic exchanges during conjugation in paramecium caudatum ehrb]. 196213997560
photodynamic bioassay of benzo(a)pyrene with paramecium caudatum. 196314043033
the flocculation of suspended matter by paramecium caudatum. 196314114923
[cytophotometric study on the desoxyribonucleic acid content of the nuclear apparatus in several varieties of paramecium caudatum]. 196314099819
an electron microscope study on regeneration of trichocysts in paramecium caudatum. 196314059615
retardation of division of three ciliates by intermittent and continuous ultraviolet radiations at different temperatures.the same dosage of ultraviolet (uv) radiation retards division of several protozoans more effectively when the light is intermittent than when it is continuous, and especially at temperatures of 25-35 degrees c. at lower temperatures the difference between the effects of intermittent and continuous radiations is less marked. somewhat similar results were obtained with the ciliates paramecium caudatum, blepharisma japonicum, and colpidium colpoda, the disparity between intermittent and continuous ...196313947762
[resistance to lethal roentgen irradiations by the interaction of blood sera with a culture of paramecium caudatum]. 196414172087
interaction of the blood sera with paramecium caudatum cultures. i. complement consumption by paramecium cultures in normal fresh sera. 196414270176
observations on atypical mitochondria in paramecium caudatum. 196414179748
[modified sensitivity of paramecium caudatum infusoria to glycolysis and respiration inhibitors and its relation to the age of cultures]. 196414236078
importance of adsorbents in the nutrition of paramecium caudatum. 196414119550
sub-microscopic structure of injured surface of paramecium caudatum. 196414222280
[apropos of the system in the reactivity of biological objects to radiations. (analysis of data obtained on paramecium caudatum)]. 196514267176
[the reaction of paramecium caudatum to the lasting influence of low single and fractional doses of ultraviolet rays]. 19655871948
[phagocytosis of bacteria by paramecium caudatum, especially of pathogenic bacteria]. 19665949505
serotypes and immobilization antigens in paramecium caudatum. 19664958003
the mechanism of the regeneration of surface structures of paramecium caudatum. 19665330521
reversal response elicited in nonbeating cilia of paramecium by membrane depolarizatin.ciliary reversal occurs in response to electrical and chemical stimuli in specimens of paramecium caudatum in which ciliary beat has been completely inhibited by external application of nickel ions. the mechanism underlying ciliary reversal appears, therefore, to differ from that of ciliary beat. the cessation of ciliary beat has no effect on the intracellular potential of paramecium. however, depolarizing action potentials are associated with ciliary reversals in paramecia, treated with nickel, ...19665923781
photosensitizing compounds in extracts of drinking water.by means of a photodynamic bioassay, with paramecium caudatum, photosensitizing compounds have been demonstrated in extracts of finished drinking water in the united states. these findings are of interest in view of a demonstrated association between photodynamic toxicity and carcinogenicity. neither the origin nor the identity of these compounds has been determined.19665914757
interaction of blood sera with the culture of paramecium caudatum. ii. individual sensitivity to medium lethal x-ray doses determined by the consumption of complement by the culture of paramecium caudatum. 19664957705
[action of the gamma radiation of thorium on the growth of paramecium caudatum and paramecium aurelia grown under radioprotective apparatus]. 19664225079
[action of several inhibitors of metabolism on the resistance to nickel salts in paramecium caudatum]. 19674967521
serotype inheritance and serotypic alleles in paramecium caudatum. 19675583737
effect of certain cations on activity of leucine naphthylamidases of paramecium caudatum. 19674964170
[observations on the ultrastructural changes of micronuclei during their transformations into macronuclei in paramecium caudatum]. 19674229126
micronuclear rna synthesis in paramecium caudatum.in a generation time of 8 hr in paramecium caudatum, the bulk of dna synthesis detected by thymidine-(3)h incorporation takes place in the latter part of the cell cycle. the micronuclear cycle includes a g(1) of 3 hr followed by an s period of 3-3(1/2) hr. g(2) and division occupies the remaining period of the cycle. macronuclear rna synthesis detected by 5'-uridine-(3)h incorporation is continuous throughout the cell cycle. micronuclear rna synthesis is restricted to the s period. ribonuclease ...19676039372
binding of ca ions by paramecium caudatum.binding of (45)ca by live paramecium caudatum was determined under various external ionic conditions. it was found that calcium uptake was separable into at least two components, a rapid and a slow one. the rapid component was influenced by the presence of certain other ions in a manner which agrees with the law of mass action. it appears that an ion exchange system may be involved in a binding equilibrium established between paramecium, ca(++), and certain other ions. k(+), rb(+), and ba(++) in ...19676033587
electron microscopy study of regeneration of surace structures of paramecium caudatum. 19675583662
[the dependence of some dehydrogenases activities in paramecium caudatum, adapted to lowered and raised temperatures, on the age of the mass culture]. 19684887842
antibiotic principles of garcinia morella: part xi--mode of action of beta and alpha-2-guttiferins on spirostomum ambiguum and paramecium caudatum. 19685718528
[the dependence of thermostability of paramecium caudatum on the presence of sucrose in the medium]. 19685709723
fine structure changes during chloral hydrate deciliation of paramecium caudatum. 19685690612
determination and inheritance of mating type in paramecium caudatum. 19685662626
[polymorphism of micronuclei of paramecium caudatum i. morphological types of interphasic nuclei]. 19685707577
[exconjugant clones of paramecium caudatum with multiple micronuclei]. 19685707576
on the interrelations between ultraviolet and visible light during their simultaneous action on the cell.beyond the earth's atmosphere, ultraviolet (uv) light that is a component of the sun's spectrum appears as one of the limiting factors to life in space and on the planets which have no ozone layer in their atmosphere. at early stages in the evolution of life, the earth's atmosphere contained neither free oxygen nor the layers serving as a screen for short-wave uv light. under such conditions, the uv radiation lasted for 8-10 hours a day. similar radiation conditions may be found on mars. still, ...196812206175
ionic control of the reversal response of cilia in paramecium caudatum. a calcium hypothesis.the duration of ciliary reversal of paramecium caudatum in response to changes in external ionic factors was determined with various ionic compositions of both equilibration and stimulation media. the reversal response was found to occur when calcium ions bound by an inferred cellular cation exchange system were liberated in exchange for externally applied cations other than calcium. factors which affect the duration of the response were (a) initial amount of calcium bound by the cation exchange ...19684966766
complement consumption by paramecium caudatum culture in normal fresh sera and its significance in the prognosis of radiation sickness in rats. 19685303817
[serologic effectiveness of individual components of a culture of paramecium caudatum]. 19695792258
[biologic action of natural irradiation: study of the growth of paramecium aurelia and paramecium caudatum in a subterranean laboratory]. 19694982844
[effect of circadian temperature change on the multiplication of paramecium caudatum]. 19695356441
[changes of the thermostability in fasting paramecium caudatum depending on the content of boron at different values of ph in the media]. 19695356440
control of the orientation of cilia by adenosinetriphosphate, calcium, and zinc in glycerol-extracted paramecium caudatum.the predominant orientation of cilia in glycerol-extracted paramecium is toward the posterior of the specimen in a kcl solution. the cilia became reoriented toward the anterior shortly after transfer of the extracted cell to a mixture of atp, calcium, and zinc. the degree of response was graded as a function of the concentration of each of the three essential factors. minimum concentrations for the maximum response were 0.2 mm in atp, 0.8 mm in calcium, and 0.0002 mm in zinc. the observations su ...19694976855
distribution of acid phosphatase in paramecium caudatum: its relations with the process of digestion. 19705420329
[paramecium caudatum as indicator for the effect of surface active agents]. 19705269684
[change in the heat resistance of paramecium caudatum dependent on the levels of several metallic ions in the medium]. 19705490109
[polymorphism of paramecium caudatum micronuclei. iv. comparative analysis of nuclear reorganization in the process of division of maturation in 4 morphological types]. 19715133749
[polymorphism of the micronuclei of paramecium caudatum. 3. cytofluorometric study of dna content]. 19715117434
fine structure of membranous and microfibrillar systems in the cortex of paramecium caudatum.an electron microscope study of the cortex of paramecium caudatum has revealed new details pertinent to several unresolved problems. the lateral boundaries of the alveoli do not regularly follow the crests of the polygonal ridges and thus their staining with silver cannot account for the external lattice seen by light microscopists. a granulo-fibrillar material is present, however, within the peaks of the ridges, which would account for the external lattice if so stained. perforations are presen ...19714102004
[effect of aflatoxin b1 on paramecium caudatum and paramecium bursaria]. 19714931381
[omega-particles, symbiotic bacteria of the micronucleus of paramecium caudatum clone m1-48 infusoria]. 19724654537
the structure of trichocysts in paramecium caudatum. 19724648510
[stability of radiation injury in a cell population (experiments on paramecium caudatum)]. 19725083482
[complement consumption by paramecium caudatum culture and survival time of patients with malignant tumors]. 19725046002
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