Showing papers by "University of Miami published in 1969"
612 citations
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TL;DR: For example, this article found that over large areas with high heat flow on the East Pacific Rise the sediments are abnormally poor in aluminum and titanium and rich in iron, manganese, boron, arsenic, cadmium, vanadium and chromium compared to pelagic sediments in general.
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121 citations
TL;DR: Examination of the data shows that combination type oral contraceptives have more abnormal tests associated with their usage than do the sequential agents, and it is suggested that carbohydrate metabolism be monitored in all patients receiving oral contraceptives for a prolonged period of time.
121 citations
TL;DR: Evidence was presented which indicated the slowest migrating component was responsible for the inhibitory activity of an inhibitor which was capable of interfering with complement mediated hemolysis of antibody sensitized sheep E.
115 citations
TL;DR: It is felt important to compare rod and cone fine-structure in experimental retinal detach ment and reattachment in the rhesus monkey which has an eye with a fovea, color vision and a retinal histology quite similar to that of man.
112 citations
TL;DR: The dipteran haltere incorporates large numbers of regularly disposed mechanoreceptors providing the sensory input enabling the vibrating haltere to function as a gyroscopic organ of equilibrium.
Abstract: The dipteran haltere incorporates large numbers of regularly disposed mechanoreceptors providing the sensory input enabling the vibrating haltere to function as a gyroscopic organ of equilibrium. Campaniform sensilla of the basal and scapal regions have been investigated by light and transmission electron microscopy, and these observations are augmented by scanning electron studies of the cuticle overlying the groups of sensilla. Each sensillum possesses a specialized fan-shaped terminal containing a complex and ordered association of microtubules and filaments. The transmission of stress to this region via the cuticle, and its possible role in transduction is considered. The fine structure of apical and basal sections of the distal sensory process and associated sheath cells is described; the functional significance of the distribution of mitochondria and other components is discussed. The organization of haltere chordotonal sensilla is described briefly, and compared with other mechanoreceptors with particular reference to microtubules and scolopale structures.
108 citations
TL;DR: Ovaries from the spider crab, Libinia emarginata L. were studied to learn more of vitellogenesis in crustaceans and yolk materials appear to be derived from both intra- and extraoocytic sources.
Abstract: Ovaries from the spider crab, Libinia emarginata L. were studied to learn more of vitellogenesis in crustaceans. Oogonia and previtellogenic oocytes were found in the core of the ovaries. Vitellogenic oocytes are located more peripherally. Profiles of the endoplasmic reticulum are abundant in the vitellogenic oocytes. The granular and agranular reticulum as well as the Golgi complex are active in yolk synthesis. As vitellogenesis proceeds, yolk precursors are incorporated into the egg by micropinocytosis at the egg surface. Thus, in Libinia, yolk materials appear to be derived from both intra- and extraoocytic sources.
TL;DR: Based on these life histories the new genusLeucosporidium is proposed with two heterothallic species and five self-sporulating species (Leu. antarcticum, Leu. frigidum), except that heterothallism has not been observed and leu.
Abstract: Investigation of yeasts from Antarctic regions revealed that certain species ofCandida have heterobasidiomycetous life cycles. Two distinct but overlapping groups of species were found: heterothallic and self-sporulating species.Candida scottii is a heterothallic species with the following life cycle: opposite mating types will conjugate and develop a dikaryotic mycelium with clamp connections. Karyogamy occurs in the teliospore which germinates and produces a promycelium. Meiosis takes place in the promycelium, followed by development of haploid sporidia to complete the life cycle. In addition,C. scottii has a self-sporulating phase. From a single cell, in the apparent absence of mating, a uninucleate mycelium is produced that lacks clamp connections. Teliospores, promycelia and sporidia develop that appear similar to those produced from dikaryotic mycelium. The self-sporulating species have life histories similar to the self-sporulating phase ofC. scottii; except that heterothallism has not been observed. Based on these life histories the new genusLeucosporidium is proposed with two heterothallic species (Leu. scottii andLeu. capsuligenum) and five self-sporulating species (Leu. antarcticum, Leu. frigidum, Leu. gelidum, Leu. nivalis andLeu. stokesii. Leu. antarcticum) andLeu. stokesii have not been described under the genusCandida.
TL;DR: An underwater television system located off Bimini, Bahamas, was used to observe and record the attraction of free-ranging sharks to a nearby sound source, and minimum attractive sound levels were remarkably low and sharks could locate a sound source within seconds from distances beyond the limit of visibility.
Abstract: An underwater television system located off Bimini, Bahamas, was used to observe and record the attraction of free-ranging sharks to a nearby sound source. Several species of sharks were attracted by irregularly pulsed signals either containing harmonics (e.g., overdriven sine waves) or consisting of octave bands of noise. Irregularly pulsed, pure tones and harmonic sounds above 1000 Hz were apparently not attractive. Attraction was not reinforced, and habituation of the approach response was regularly observed in prolonged test series. As the number of sharks in the test area increased, swimming activity rose dramatically. Circling and crisscrossing of the site became more intense under conditions of low ambient light and turbidity. Additional tests showed that minimum attractive sound levels were remarkably low, and that sharks could locate a sound source within seconds from distances beyond our limit of visibility (about 25 m).
TL;DR: Origin of life data, discussing self ordered polymers, propagative cell-like systems, protenoids, cellular evolution, etc.
Abstract: Origin of life data, discussing self ordered polymers, propagative cell-like systems, protenoids, cellular evolution, etc
TL;DR: In this article, extracts from human E stromata were found to be capable of causing inhibition of the complement mediated lysis of antibody sensitized sheep red cells, and the inhibition resulted from an increase in the rate of SAbC′la, 4, 2a decay to the SAbc′la 4 state.
TL;DR: Prolyl transfer ribonucleic acid synthetase of Escherichia coli B exists in vitro as an active dimer or as an inactive monomer, separable by hydroxylapatite chromatography.
TL;DR: Fiddler crabs Uca were fed natural detritus containing DDT residues (10 parts per million) an 11-day experiment and showed grossly modified behavior associated threefold increase in concentration ofDDT residues in the muscle of the large claw.
Abstract: DDT and its metabolites accumulate in organic plant detritus estuaries and may persist there for many years. The residues appear to be most abundantly associated with particulates having diameters from 250 to 1000 microns. Detritus particles of this size are ingested by many organisms, sociated DDT residues may enter diverse food chains. Fiddler crabs Uca were fed natural detritus containing DDT residues (10 parts per million) an 11-day experiment and showed grossly modified behavior associated threefold increase in concentration of DDT residues in the muscle of the large claw.
TL;DR: In this article, the partial molal volumes of ions in 35.1 ǫ salinity seawater, V*0(ion)sw, have been examined by a simple model for ion-solvent interactions.
Abstract: The partial molal volumes of ions in 35.1‰ salinity seawater, V*0(ion)sw, have been examined by a simple model for ion-solvent interactions. The volume of transfer of an ion from water to seawater (ml/mol) can be represented by the equation, ΔV*0(trans) = aZ2/r + b. The V*0 of other ions in seawater have been estimated using this semiempirical equation. The effects of temperature and salinity on V*0(ions) are discussed and shown to be predictable by the proposed model.
TL;DR: The mature sperm of Libinia emarginata possesses a large acrosome exhibiting several zones of varying electron density which surrounds the central acrosomal tubule.
TL;DR: The data lend strong support to the hypothesis that inhibition of mitochondrial protein synthesis is the biochemical basis for reversible bone marrow depression from chloramphenicol.
TL;DR: Interaction of input from the two types of sense organs provides the system with a dynamically determined reference point for the basic postural position, which may be altered by efferent control of the receptor muscle.
Abstract: 1. Proprioceptive reflexes involved in control of the mero-carpopodite ( MC ) joint in walking legs of Cancer magister are mediated by four groups of sensory cells: ( a ) two cell groups (myochordotonal organs), located proximally in the leg segment, which are associated with a receptor muscle and come under efferent control, and ( b ) two cell groups ( MC organs) located distally which signal joint position and movement but are independent of efferent control. 2. Resistance reflexes, which oppose passive movements of the joint, are evoked by both types of proprioceptive organs. Reflexes evoked by the MC organs are maximally effective at the extremes of joint position. 3. Reciprocal inhibition of antagonistic muscle groups appears to occur entirely at synapses within the central nervous system. 4. Efferent control of the receptor muscle comes under the influence of both the myochordotonal and MC organs. The reflexes evoked by the MC organs on the receptor muscles are similar to those which impinge on the main flexor. The myochordotonal organ excites the receptor muscle on joint movements away from the rest position. Interaction of input from the two types of sense organs provides the system with a dynamically determined reference point for the basic postural position. This may be altered by efferent control of the receptor muscle. 5. Reflexes evoked by both types of proprioceptive organ spread to the other walking legs, but are more labile than reflexes to the same leg.
TL;DR: The data show a decrease of stereoscopic acuity as a function of horizontal offset, and there is a slight discontinuity in the curve, near 4° to 6°, which may correspond to a rod–cone density change.
Abstract: The threshold of stereopsis (mean deviation in sec of arc) of three observers was measured at 2° intervals from 8° right to 8° left in the horizontal meridian of the binocular field. A simple two-point target, along with a binocular fixation point, was presented by use of a mirror haploscope. Disparity was introduced by varying the separation of the two peripheral points in one eye. Judgments of the relative depth of the two binocular peripheral points, were based on these disparity cues. The data show a decrease of stereoscopic acuity as a function of horizontal offset. There is a slight discontinuity in the curve, near 4° to 6°, which may correspond to a rod–cone density change.
TL;DR: A molecular model of the interaction between mononucleotides and polyamino-acids predicts the glycine codon GGG, and suggests RNA evolved before DNA.
Abstract: A molecular model of the interaction between mononucleotides and polyamino-acids predicts the glycine codon GGG, and suggests RNA evolved before DNA.
TL;DR: In this article, a mode of propagation of acoustic waves in the atmosphere in which the wave energy E (z) decreases exponentially with z with a scale c02/(2 + y) g (about 16 km) was proposed.
Abstract: If the variations in sound speed c (z) and wind u (z) with height z are not too great, there is a mode of propagation of acoustic waves in the atmosphere in which the wave energy E (z) decreases exponentially with z with a scale c02/(2 – y) g (about 16 km), and the phase speed cm is given approximately by
(about 300 m s−1).
TL;DR: In this paper, the authors analyzed seven sediments from the East Pacific for Hg and found that all high Hg values were found on the crest of the east pacific rise, either volcanic or absorption processes could explain this distribution pattern.
TL;DR: A number of experiments reveal that the activity for a given substrate, as found in the proteinoid studied, is absent from many contemporary proteins tested, a property not yet found in specialized, highly evolved proteins.
Abstract: Catalytic activities of thermal polyanhydro-alpha- amino acids for modeling enzymes and prebiotic protein
TL;DR: It is concluded that enzymes of blood could not account for the apparent rate of loss of bradykinin in the pulmonary circulation.