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  • Humans  (270)
  • sediments  (42)
  • American Association for the Advancement of Science (AAAS)  (270)
  • Springer  (42)
  • American Association for the Advancement of Science
  • Annual Reviews
  • Nature Publishing Group
  • 1980-1984  (312)
  • 1935-1939
  • 1982  (312)
  • 1939
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (270)
  • Springer  (42)
  • American Association for the Advancement of Science
  • Annual Reviews
  • Nature Publishing Group
Years
  • 1980-1984  (312)
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Experimental measurement of sediment nitrification and denitrification in Hamilton Harbour, Canada (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 207-216 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; water column ; nitrification ; denitrification ; experiments ; modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This research examines the role of sediment nitrification and denitrification in the nitrogen cycle of Hamilton Harbour. The Harbour is subject to large ammonia and carbon loadings from a waste-water treatment plant and from steel industries. Spring ammonia concentrations rapidly decrease from 4.5 to 0.5 mg 1−1, while spring nitrate concentrations increase from 1 to 2 mg l−1, by mid-summer. A three-layer sediment model was developed. The first layer is aerobic; in it, oxidation of organics and nitrification occurs. The second layer is for denitrification, and the third layer is for anaerobic processes. Ammonia sources for nitrification include diffusion from the water column, sources associated with the oxidation of organics, sources from denitrification and from anaerobic processes. Diffusion of oxygen, ammonia and nitrate across the sediment-water interface occurs. Temperature effects are modelled using the Arrhenius concept. A combination of zero-order kinetics for nitrate or ammonia consumption with diffusion results in a half-order reaction, with respect to the water column loss rate to sediments. From experimental measurement, the rate of nitrification is 200 mg N 1−1 sediment per day, while that of denitrification is 85 mg N 1–1 sediment per day at 20 °C. The Arrhenius activation energy is estimated as 15 000 cal/ mole-K and 17 000 cal/ mole-K for nitrification and denitrification, respectively, between 10 °C and 20 °C. Calculations of the flux of ammonia with the sediments, using the biofilm model, compare favourably with experimental observations. The ammonia flux from the water column is estimated to account for 20% of the observed decrease in water column stocks of ammonia, while the nitrate flux from the water column is estimated to account for 25% of the total nitrogen produced by the sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940111
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  • 2
    Electronic Resource
    Electronic Resource
    Particle size distribution and chemical parameters of the sediments of a shallow turbid impoundment (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 341-353 
    Details
    ISSN: 1573-5117
    Keywords: Impoundment ; sediments ; particle size ; major ions ; nutrients ; cation exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As part of an ecosystem study of a small mesotrophic turbid impoundment in the semi-arid part of South Africa, an investigation was made of the particle size distribution, organic content and inorganic chemical composition of the sediment. Nine transects 50 m apart were made during February 1980. Sediments were sampled with an Eckman grab. The following analyses were made: size fractionation by wet sieving, cation exchange capacity, exchangeable Na, K, Ca, Mg and PO4, total P, and loss on ignition. From the results it was clear that the finer particles, in or near the original river bed, had higher cation exchange capacity, total P, exchangeable phosphorus and organic content. Littoral areas with avian habitat and extensive macrophyte vegetation, contained coarser sediments. Organic detritus apparently migrated to the deeper part of the impoundment. Sediments of lacustrine and fluvial origin were identified by means of the Passega classification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940124
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  • 3
    Electronic Resource
    Electronic Resource
    Spatial heterogeneity in whole lake sediments — towards a loading estimate (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 235-240 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; nutrients ; loading estimates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Studies of nutrient loadings, to shallow culturally eutrophied Alberta lakes, suggest internal inputs are significant. In this regard, estimation of bottom sediment P loads to Lake Wabamun (80 km2, 5.5 m $$\bar x$$ depth) were examined. Initially we determined the spatial variability in Total Organic Content (% loss on ignition) and Total Phosphorus, as indicators. Phosphorus fractions and biologically available phosphorus (BAP) were measured at specific stations. These data showed a very uniform distribution in sediment type with a Total Organic Content of 40.6 ± 3.3 (95% C.L.) at the west end, gradually declining to 26.3 ± 0.9 at the east end. Transects performed at routine monitoring stations indicate the representativeness of each station, e.g., station 2, 40.8 ± 1.3 (10 sites). One explanation of this uniformity is provided from210Pb analysis of shallow cores which indicate mixing to a depth of 16 cm. This is also thought to explain the mechanics of P loading to the water phase. Finally, Total Organic Content relates well to BAP (r2 = 0.80). It is hoped that this simple technique may well permit more precise extrapolation to whole lake BAP estimates at least on this lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940114
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  • 4
    Electronic Resource
    Electronic Resource
    Distribution and concentrations of naturally-occurring radionuclides in sediments in a uranium mining area of northern Saskatchewan, Canada (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 355-361 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; uranium ; radium ; radionuclides ; models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Uranium mining and milling operations can contribute to environmental degradation through the increased release of naturally-occurring radionuclides. However, studies of the interactions of these radionuclides with freshwater sediments have been limited. The present study examined the vertical distribution of uranium, thorium, radium-226, polonium-210 and lead-210 in undisturbed sediment cores collected in the vicinity of mining, milling and exploration activities. Uranium levels in surface sediments ranged from 1.9 to 5650 µg g−1, Ra-226 from 〈0.1 to 480 pCi g−1 and Pb-210 from 0.8 to 931 pCi g−1 in the samples reported here, with the highest values occurring downstream of waste rock disposal areas. Concentrations usually decreased with depth, and there was little evidence of any strong effect of bioturbation on radionuclide profiles at the scale examined here. Mathematical models of uranium and radium-226 adsorption on and movement into the sediment were constructed, based on expected adsorption coefficients and estimated loading. The model predictions of radionuclide distribution with depth were qualitatively similar to those actually measured, but the predicted concentrations were generally lower than those observed, both in unaffected areas and in areas adjacent to uranium extraction activities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000035
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  • 5
    Electronic Resource
    Electronic Resource
    Lake sediments as recorders of geomagnetic field variations — applications to dating post-Glacial sediments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 587-596 
    Details
    ISSN: 1573-5117
    Keywords: dating ; sediments ; geomagnetic variations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Field and laboratory methods, developed to recover the record of past secular variations of geomagnetic declination and inclination carried by the remanent magnetization of some lake sediments, are described. Type curves, delineating these parameters through post-Glacial time, have now been constructed for Europe and east-central N. America. These curves, once established for any region, are useful for dating lake sediments from that region. The principal inclination features exhibited by the European curves can also be identified along the N. American curves with a delay of some 600 years, on average.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391973
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  • 6
    Electronic Resource
    Electronic Resource
    Stratigraphic and dynamic effects of sediment reworking by Great Lakes zoobenthos (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 611-622 
    Details
    ISSN: 1573-5117
    Keywords: zoobenthos ; Great Lakes ; sediments ; radionuclides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent sediments of the North American Great Lakes are inhabited by numerous species of macrobenthos which alter the physical and chemical properties of sediments and modify interface transport characteristics. Distributions of such radionuclides as cesium-137, lead-210, and isotopes of plutonium exhibit a zone of constant activity extending down from the sediment-water interface from 1 to 15 cm. Recent studies have confirmed that radiometrically determined mixed depths are consistent with the vertical distribution of oligochaete worms and the amphipod,Pontoporeia hoyi. Generally, 90% of the benthos are contained within the radiometrically defined mixed zone. Where comparisons are possible, rates of sediment reworking by ‘conveyor belt’ species are comparable to or exceed sedimentation rates. Systematic variations in the mixed depth occur within depositional basins with greatest depths tending to be associated with least consolidated, organically rich materials. A quantitative steady-state mixing model accounts satisfactorily for observed radioactivity and heavy metal profiles. Bioturbation appears to be an important process, limiting the resolution with which historical records of particle-associated contaminants may be reconstructed from sediment cores. As bioturbation serves to maintain contact of contaminated sediments with overlying water, this time may also characterize the long-term lake recovery for contaminants removed by burial. As the time varies with location, a mean for an entire lake is not well known, but is on the order of 20 years for Lake Huron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391976
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  • 7
    Electronic Resource
    Electronic Resource
    Transport of iron and manganese in relation to the shapes of their concentration-depth profiles (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 463-471 
    Details
    ISSN: 1573-5117
    Keywords: iron ; manganese ; sediments ; water ; transport ; model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A model is presented which describes the transport of iron and manganese in the vicinity of a redox boundary. It is based on input of a particulate component, to form a point source, from which soluble species diffuse along a concentration gradient. The shapes of concentration-depth profiles in marine and freshwater sediments and water columns are reviewed and discussed in terms of the model. Transport, either entirely within a water column or within the sediment, may be simply treated because the rate of vertical transport can be regarded as constant. The discontinuity in the rate of vertical transport which occurs at the sediment-water interface can provide a complicated example of the model, especially when it coincides with the redox boundary. Authigenic mineral formation processes can modify the model, sometimes to such an extent that it becomes invalid. This is particularly true for soluble iron profiles in organically rich marine sediments. Sampling interval is critical to the resultant profile shape and must be relevant to the particular environment, e.g. metres in water columns and millimetres in sediments. The differences in the rates of reduction and oxidation of iron and manganese tend to modify both the position of the profile with respect to the redox-cline and its stage of development in a seasonally anoxic system. It is these factors which determine why most of the iron which reaches a sediment is permanently incorporated whereas manganese is re-released. This mechanism determines the average ratio of iron to manganese in sedimentary rocks. The development of peaked profile shapes in water columns implies that under certain conditions dissolved iron and manganese may be transported from the water column to the pore waters of the sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000044
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  • 8
    Electronic Resource
    Electronic Resource
    Deepwater sediments and trophic conditions in Florida lakes (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 597-602 
    Details
    ISSN: 1573-5117
    Keywords: eutrophication ; diagenesis ; sediments ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sediment cores were taken from near maximum depth in 15 Florida lakes representing a wide range of trophic conditions. Chemical analyses of surface sediments showed Al, Fe, and Ca to be the most abundant elements in all samples, and the ratio of Al to Ca to be smaller for eutrophic lakes. Sediment organic matter increased with trophic state, as did the degree to which it was enriched in nitrogen. Corresponding sediment C/N ratios decreased with increasing lake trophic state and showed significant negative correlation with chlorophyll a, total N, and total P in the water column. Concentrations of sedimentary chlorophyll derivatives showed some relation to trophic state but differences in basin morphometry hinder its use as an inter-lake index of chlorophyll production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000058
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental measurement of sediment nitrification and denitrification in Hamilton Harbour, Canada (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 207-216 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; water column ; nitrification ; denitrification ; experiments ; modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This research examines the role of sediment nitrification and denitrification in the nitrogen cycle of Hamilton Harbour. The Harbour is subject to large ammonia and carbon loadings from a waste-water treatment plant and from steel industries. Spring ammonia concentrations rapidly decrease from 4.5 to 0.5 mg 1−1, while spring nitrate concentrations increase from 1 to 2 mg l−1, by mid-summer. A three-layer sediment model was developed. The first layer is aerobic; in it, oxidation of organics and nitrification occurs. The second layer is for denitrification, and the third layer is for anaerobic processes. Ammonia sources for nitrification include diffusion from the water column, sources associated with the oxidation of organics, sources from denitrification and from anaerobic processes. Diffusion of oxygen, ammonia and nitrate across the sediment-water interface occurs. Temperature effects are modelled using the Arrhenius concept. A combination of zero-order kinetics for nitrate or ammonia consumption with diffusion results in a half-order reaction, with respect to the water column loss rate to sediments. From experimental measurement, the rate of nitrification is 200 mg N 1−1 sediment per day, while that of denitrification is 85 mg N 1–1 sediment per day at 20 °C. The Arrhenius activation energy is estimated as 15 000 cal/ mole-K and 17 000 cal/ mole-K for nitrification and denitrification, respectively, between 10 °C and 20 °C. Calculations of the flux of ammonia with the sediments, using the biofilm model, compare favourably with experimental observations. The ammonia flux from the water column is estimated to account for 20% of the observed decrease in water column stocks of ammonia, while the nitrate flux from the water column is estimated to account for 25% of the total nitrogen produced by the sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391937
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  • 10
    Electronic Resource
    Electronic Resource
    Introduction (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 1-1 
    Details
    ISSN: 1573-5117
    Keywords: symposium ; sediments ; freshwater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940091
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  • 11
    Electronic Resource
    Electronic Resource
    Transport of iron and manganese in relation to the shapes of their concentration-depth profiles (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 463-471 
    Details
    ISSN: 1573-5117
    Keywords: iron ; manganese ; sediments ; water ; transport ; model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A model is presented which describes the transport of iron and manganese in the vicinity of a redox boundary. It is based on input of a particulate component, to form a point source, from which soluble species diffuse along a concentration gradient. The shapes of concentration-depth profiles in marine and freshwater sediments and water columns are reviewed and discussed in terms of the model. Transport, either entirely within a water column or within the sediment, may be simply treated because the rate of vertical transport can be regarded as constant. The discontinuity in the rate of vertical transport which occurs at the sediment-water interface can provide a complicated example of the model, especially when it coincides with the redox boundary. Authigenic mineral formation processes can modify the model, sometimes to such an extent that it becomes invalid. This is particularly true for soluble iron profiles in organically rich marine sediments. Sampling interval is critical to the resultant profile shape and must be relevant to the particular environment, e.g. metres in water columns and millimetres in sediments. The differences in the rates of reduction and oxidation of iron and manganese tend to modify both the position of the profile with respect to the redox-cline and its stage of development in a seasonally anoxic system. It is these factors which determine why most of the iron which reaches a sediment is permanently incorporated whereas manganese is re-released. This mechanism determines the average ratio of iron to manganese in sedimentary rocks. The development of peaked profile shapes in water columns implies that under certain conditions dissolved iron and manganese may be transported from the water column to the pore waters of the sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391960
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  • 12
    Electronic Resource
    Electronic Resource
    Deepwater sediments and trophic conditions in Florida lakes (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 597-602 
    Details
    ISSN: 1573-5117
    Keywords: eutrophication ; diagenesis ; sediments ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sediment cores were taken from near maximum depth in 15 Florida lakes representing a wide range of trophic conditions. Chemical analyses of surface sediments showed Al, Fe, and Ca to be the most abundant elements in all samples, and the ratio of Al to Ca to be smaller for eutrophic lakes. Sediment organic matter increased with trophic state, as did the degree to which it was enriched in nitrogen. Corresponding sediment C/N ratios decreased with increasing lake trophic state and showed significant negative correlation with chlorophylla, total N, and total P in the water column. Concentrations of sedimentary chlorophyll derivatives showed some relation to trophic state but differences in basin morphometry hinder its use as an inter-lake index of chlorophyll production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391974
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  • 13
    Electronic Resource
    Electronic Resource
    Microbial metabolism in surface sediments and its role in the immobilization of phosphorus in oligotrophic lake sediments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 261-268 
    Details
    ISSN: 1573-5117
    Keywords: microbial metabolism ; phosphorus ; sediments ; oligotrophic lake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rapid microbial metabolism and a large phosphorus uptake potential were observed in surface sediments of Lake George, New York. This sediment (termed the flocculent layer) also exhibited a phosphorus limited condition and a large reservoir of inorganic phosphorus associated with humic substances. These observations suggest that the empirically observed phosphorus retention in oligotrophic lake sediments may be promoted by a rapid cycling of phosphorus between microflora and its associated organic matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391943
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  • 14
    Electronic Resource
    Electronic Resource
    Standardization of methods of analysis for heavy metals in sediments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 689-695 
    Details
    ISSN: 1573-5117
    Keywords: standardization ; heavy metals ; sediments ; base-line levels ; chemical partition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In studies of heavy metals in sediments, there is a need for standardization of the procedures for sample collection and preservation, chemical analyses and presentation of results. The method and depth of sampling depend on the aim of the investigation and on local sediment conditions, such as consistency of the sediment, rate of sedimentation, diagnetic processes and bioturbation. Therefore no general recommendations can be given in this respect. During collection and preservation, contamination and loss of constituents ust be avoided. In sediments, the best means for estimating total contents of metals is digestion with HF, in combination with strong acids. Other methods include X-ray fluorescence and neutron activation analyses. The use of HF is considered objectionable by some laboratories. A reasonable alternative is aqua regia. Because variations in granular composition affect metal contents, it is advisable to use the fraction 〈 63 μm for the analysis. Chemical partition of sediments provides an insight into the source of metallic constituents, and their pathways to deposition areas. A three-step extraction procedure, in the sequence 0.1 M hydroxylamine-HCl, H2O2 30% and HF, is proposed. Finally, attention is paid to the anthropogenic enrichment of metals in sediments. The establishment of base-line levels is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940158
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  • 15
    Electronic Resource
    Electronic Resource
    Zinc in water and sediments of two finnish lakes (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 155-160 
    Details
    ISSN: 1573-5117
    Keywords: heavy metals ; zinc ; lakes ; sediments ; pollution ; industrial load ; sedimentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of zinc in Lake Vanajavesi and Lake Mallasvesi, South Finland, was determined on the basis of water and sediment studies. Lake Vanajavesi is one of the most polluted of large inland lakes, in Finland. The zinc load comes mainly from industrial sources. Lake Mallasvesi, situated near Vanajavesi, is in almost natural condition. The water samples were taken by a Ruttner sampler. In collecting sediment samples, a freezing technique was used. The results of zinc analyses indicate that, during several winters, zinc has spread with waste water to different parts of L. Vanaja against the main course of flow. A close correlation between sedimentation of zinc and waste discharge from a textile factory was found in the present study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391931
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  • 16
    Electronic Resource
    Electronic Resource
    Standardization of methods of analysis for heavy metals in sediments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 689-695 
    Details
    ISSN: 1573-5117
    Keywords: standardization ; heavy metals ; sediments ; base-line levels ; chemical partition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In studies of heavy metals in sediments, there is a need for standardization of the procedures for sample collection and preservation, chemical analyses and presentation of results. The method and depth of sampling depend on the aim of the investigation and on local sediment conditions, such as consistency of the sediment, rate of sedimentation, diagnetic processes and bioturbation. Therefore no general recommendations can be given in this respect. During collection and preservation, contamination and loss of constituents ust be avoided. In sediments, the best means for estimating total contents of metals is digestion with HF, in combination with strong acids. Other methods include X-ray fluorescence and neutron activation analyses. The use of HF is considered objectionable by some laboratories. A reasonable alternative is aqua regia. Because variations in granular composition affect metal contents, it is advisable to use the fraction 〈 63 μm for the analysis. Chemical partition of sediments provides an insight into the source of metallic constituents, and their pathways to deposition areas. A three-step extraction procedure, in the sequence 0.1 M hydroxylamine-HCl, H2O2 30% and HF, is proposed. Finally, attention is paid to the anthropogenic enrichment of metals in sediments. The establishment of base-line levels is discussed.
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    URL: http://dx.doi.org/10.1007/BF02391984
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  • 17
    Electronic Resource
    Electronic Resource
    Comparison of sediment energy-texture relationships in marine and lacustrine environments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 71-84 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; lakes ; seas ; oceans ; energy relationships ; population statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sediments in the marine environment are generally subject to higher energy levels than those of lake systems, and lakes are virtually unaffected by tidal range which modifies beach structures formed in response to wave effects. However, despite different energy levels, the textural characteristics of both marine and lacustrine sediments are very similar. The main difference between marine and lacustrine facies is the depth range over which these characteristics remain consistent. In lakes, depth limitation may influence the development of surface waves and restrict textural distributions. Simple textural relationships can be used to describe comparable marine and lacustrine sedimentary conditions. Sediments which have been altered by post-depositional erosion, such as lag deposits, or by ice-drop or wind blown settlement, show comparable textural modifications. The settlement of silt and clay size particulates, in the marine environment and lakes, may differ slightly because of the chemical differences between salt and fresh water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940097
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  • 18
    Electronic Resource
    Electronic Resource
    The fractionation of iron-phosphorus compounds in sediments studied by Mössbauer spectroscopy (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 697-700 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; Mössbauer spectroscopy ; iron ; phosphorus ; geochemistry ; analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Iron compounds of phosphorus form a large part of the phosphorus bound in sediments. Mössbauer spectroscopy is a technique that enables us to study, directly, chemical forms of iron in solid samples. Mössbauer spectroscopy allowed us to check, directly, the selectivity of the extraction scheme for soil phosphorus proposed by Chang & Jackson (1957), but only as far as the iron compounds are concerned. It appears that selectivity of the extraction method leaves much to be desired.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940159
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  • 19
    Electronic Resource
    Electronic Resource
    Model for instream regulation of radioisotopes and heavy metals in riverine waters subjected to a uranium mill discharge (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 175-188 
    Details
    ISSN: 1573-5117
    Keywords: simulation ; sediments ; radioisotopes ; heavy metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the Athabaska sandstone region of northern Saskatchewan, mining and milling of uranium-bearing ore is subjecting, and will continue to subject, surface waters to inputs of soluble heavy metals and uranium and thorium decay series radioisotopes. A mathematical simulation model was developed to assess the role of riverine sediments in regulating soluble concentrations of heavy metals and radioisotopes released to the environment through treated mining and milling process effluents. Specific elements studied included As, Ni, Pb, U, and Ra-226. The model considered that diffusion into sediment porewater and adsorption by sediment particulates from sediment porewater were the two dominant mechanisms regulating sediment loading. Experiments indicated that the equilibrium adsorption behaviour of the heavy metals and radioisotopes studied could be adequately explained using a linear adsorption isotherm, over the range of concentrations expected in the environment. Experimentally determined linear isotherm slopes ranged from 200 ml g−1 to 21 000 ml gl. Diffusion into the effective depth of the sediments (20 cm) was modelled using a quadratic (second order) driving force and a corresponding mass transfer coefficient. The model coefficients were calibrated using field and laboratory data. Results of the modelling suggested that the sediments have a small effect on instream concentrations during the active phases of mining and milling. The sediments were predicted to accumulate sufficient adsorbed mass, during the operational phase of mining and milling, to act as a distributed instream source after completion of milling activities. The significance of this post-operational source was a function of the initial effluent loading, elapsed time and site specific river characteristics.
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    URL: http://dx.doi.org/10.1007/BF00940108
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  • 20
    Electronic Resource
    Electronic Resource
    Microbial metabolism in surface sediments and its role in the immobilization of phosphorus in oligotrophic lake sediments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 261-268 
    Details
    ISSN: 1573-5117
    Keywords: microbial metabolism ; phosphorus ; sediments ; oligotrophic lake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rapid microbial metabolism and a large phosphorus uptake potential were observed in surface sediments of Lake George, New York. This sediment (termed the flocculent layer) also exhibited a phosphorus limited condition and a large reservoir of inorganic phosphorus associated with humic substances. These observations suggest that the empirically observed phosphorus retention in oligotrophic lake sediments may be promoted by a rapid cycling of phosphorus between microflora and its associated organic matter.
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    Distribution and concentrations of naturally-occurring radionuclides in sediments in a uranium mining area of northern Saskatchewan, Canada (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 355-361 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; uranium ; radium ; radionuclides ; models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Uranium mining and milling operations can contribute to environmental degradation through the increased release of naturally-occurring radionuclides. However, studies of the interactions of these radionuclides with freshwater sediments have been limited. The present study examined the vertical distribution of uranium, thorium, radium-226, polonium-210 and lead-210 in undisturbed sediment cores collected in the vicinity of mining, milling and exploration activities. Uranium levels in surface sediments ranged from 1.9 to 5650 µg g−1, Ra-226 from 〈0.1 to 480 pCi g−1 and Pb-210 from 0.8 to 931 pCi g−1 in the samples reported here, with the highest values occurring downstream of waste rock disposal areas. Concentrations usually decreased with depth, and there was little evidence of any strong effect of bioturbation on radionuclide profiles at the scale examined here. Mathematical models of uranium and radium-226 adsorption on and movement into the sediment were constructed, based on expected adsorption coefficients and estimated loading. The model predictions of radionuclide distribution with depth were qualitatively similar to those actually measured, but the predicted concentrations were generally lower than those observed, both in unaffected areas and in areas adjacent to uranium extraction activities.
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    URL: http://dx.doi.org/10.1007/BF00940125
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    Distribution and concentrations of naturally-occurring radionuclides in sediments in a uranium mining area of northern Saskatchewan, Canada (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 355-361 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; uranium ; radium ; radionuclides ; models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Uranium mining and milling operations can contribute to environmental degradation through the increased release of naturally-occurring radionuclides. However, studies of the interactions of these radionuclides with freshwater sediments have been limited. The present study examined the vertical distribution of uranium, thorium, radium-226, polonium-210 and lead-210 in undisturbed sediment cores collected in the vicinity of mining, milling and exploration activities. Uranium levels in surface sediments ranged from 1.9 to 5650 µg g−1, Ra-226 from 〈0.1 to 480 pCi g−1 and Pb-210 from 0.8 to 931 pCi g−1 in the samples reported here, with the highest values occurring downstream of waste rock disposal areas. Concentrations usually decreased with depth, and there was little evidence of any strong effect of bioturbation on radionuclide profiles at the scale examined here. Mathematical models of uranium and radium-226 adsorption on and movement into the sediment were constructed, based on expected adsorption coefficients and estimated loading. The model predictions of radionuclide distribution with depth were qualitatively similar to those actually measured, but the predicted concentrations were generally lower than those observed, both in unaffected areas and in areas adjacent to uranium extraction activities.
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    The fractionation of iron-phosphorus compounds in sediments studied by Mössbauer spectroscopy (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 697-700 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; Mössbauer spectroscopy ; iron ; phosphorus ; geochemistry ; analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Iron compounds of phosphorus form a large part of the phosphorus bound in sediments. Mössbauer spectroscopy is a technique that enables us to study, directly, chemical forms of iron in solid samples. Mössbauer spectroscopy allowed us to check, directly, the selectivity of the extraction scheme for soil phosphorus proposed by Chang & Jackson (1957), but only as far as the iron compounds are concerned. It appears that selectivity of the extraction method leaves much to be desired.
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    Spatial heterogeneity in whole lake sediments — towards a loading estimate (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 235-240 
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    ISSN: 1573-5117
    Keywords: sediments ; nutrients ; loading estimates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Studies of nutrient loadings, to shallow culturally eutrophied Alberta lakes, suggest internal inputs are significant. In this regard, estimation of bottom sediment P loads to Lake Wabamun (80 km2, 5.5 m $$\bar x$$ depth) were examined. Initially we determined the spatial variability in Total Organic Content (% loss on ignition) and Total Phosphorus, as indicators. Phosphorus fractions and biologically available phosphorus (BAP) were measured at specific stations. These data showed a very uniform distribution in sediment type with a Total Organic Content of 40.6 ± 3.3 (95% C.L.) at the west end, gradually declining to 26.3 ± 0.9 at the east end. Transects performed at routine monitoring stations indicate the representativeness of each station, e.g., station 2, 40.8 ± 1.3 (10 sites). One explanation of this uniformity is provided from210Pb analysis of shallow cores which indicate mixing to a depth of 16 cm. This is also thought to explain the mechanics of P loading to the water phase. Finally, Total Organic Content relates well to BAP (r2 = 0.80). It is hoped that this simple technique may well permit more precise extrapolation to whole lake BAP estimates at least on this lake.
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    An investigation into some physical and biotic effects of flooding on reservoir mud previously subjected to a period of aerial exposure (1982)
    Springer
    Hydrobiologia 97 (1982), S. 27-35 
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    ISSN: 1573-5117
    Keywords: Hong Kong ; man-made lake ; marginal zone ; sediments ; Melanoides tuberculata ; freshwater gastropods ; allochthonous ; water-level fluctuations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A series of laboratory experiments were carried out in order to investigate the effects of selected physical and biotic processes on the substratum of a recently flooded gently sloping marginal zone of Plover Cove Reservoir, Hong Kong. The physical effects of disturbance of the sediments promoted the redistribution of organic matter, as shown by differences in the percentage of organic matter in the supernatant and residue resulting when reservoir mud was stirred. It is suggested that such a process would promote the transfer of allochthonous organic carbon from the marginal zone (the area of input of such material) to the rest of the water body. Substrate characteristics were also influenced by the activities of two species of benthic gastropod,Sinotaia quadrata andMelanoides tuberculata. These animals increased the rate of production of particles from soaked blocks of parent mud when compared with experimental treatments in the absence of snails. Additionally both species enhanced the production of aggregates from fine sediments with a particle size of less than 125 µm. The magnitudes of both processes were statistically significant. Laboratory observations showed thatM. tuberculata had a significantly faster rate of aggregate and fine particulate production thanS. quadrata and it is possible that the former species may have the capacity to modify the substrate characteristics of the newly flooded marginal zone of Plover Cove.
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    Effect of artificial destratification on iron, manganese, and zinc in the water, sediments, and two species of benthic macroinvertebrates in an Oklahoma lake (1982)
    Springer
    Hydrobiologia 87 (1982), S. 11-16 
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    ISSN: 1573-5117
    Keywords: lake stratification ; artificial destratification ; lake mixing ; heavy metals ; sediments ; benthic macroinvertebrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ham's Lake was destratified in the summers of 1977 and 1978 by pumping surface water to the bottom. However, an arm was prevented from mixing by a submerged dam of a former farm pond and remained stratified. The concentration of manganese in the water increased to over 5 000 µg 1−1 in the hypolimnion of the anoxic arm in summer. Soluble manganese averaged 28% of total concentration. Total iron concentrations were relatively high in the water and sorbed iron values were extremely low in the sediments. Soluble iron averaged 12% of total concentration. Zinc values were low in the water and sediments. Chaoborus punctipennis and Chironomus riparius concentrated iron and zinc and discriminated against manganese. Concentration factors were unaffected by mixing.
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    The fractionation of iron-phosphorus compounds in sediments studied by Mössbauer spectroscopy (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 697-700 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; Mössbauer spectroscopy ; iron ; phosphorus ; geochemistry ; analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Iron compounds of phosphorus form a large part of the phosphorus bound in sediments. Mössbauer spectroscopy is a technique that enables us to study, directly, chemical forms of iron in solid samples. Mössbauer spectroscopy allowed us to check, directly, the selectivity of the extraction scheme for soil phosphorus proposed by Chang & Jackson (1957), but only as far as the iron compounds are concerned. It appears that selectivity of the extraction method leaves much to be desired.
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    Deepwater sediments and trophic conditions in Florida lakes (1982)
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    Hydrobiologia 91-92 (1982), S. 597-602 
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    ISSN: 1573-5117
    Keywords: eutrophication ; diagenesis ; sediments ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sediment cores were taken from near maximum depth in 15 Florida lakes representing a wide range of trophic conditions. Chemical analyses of surface sediments showed Al, Fe, and Ca to be the most abundant elements in all samples, and the ratio of Al to Ca to be smaller for eutrophic lakes. Sediment organic matter increased with trophic state, as did the degree to which it was enriched in nitrogen. Corresponding sediment C/N ratios decreased with increasing lake trophic state and showed significant negative correlation with chlorophylla, total N, and total P in the water column. Concentrations of sedimentary chlorophyll derivatives showed some relation to trophic state but differences in basin morphometry hinder its use as an inter-lake index of chlorophyll production.
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    Introduction (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 1-8 
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    ISSN: 1573-5117
    Keywords: symposium ; sediments ; freshwater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02391917
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    Comparison of sediment energy-texture relationships in marine and lacustrine environments (1982)
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    Hydrobiologia 91-92 (1982), S. 71-84 
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    ISSN: 1573-5117
    Keywords: sediments ; lakes ; seas ; oceans ; energy relationships ; population statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sediments in the marine environment are generally subject to higher energy levels than those of lake systems, and lakes are virtually unaffected by tidal range which modifies beach structures formed in response to wave effects. However, despite different energy levels, the textural characteristics of both marine and lacustrine sediments are very similar. The main difference between marine and lacustrine facies is the depth range over which these characteristics remain consistent. In lakes, depth limitation may influence the development of surface waves and restrict textural distributions. Simple textural relationships can be used to describe comparable marine and lacustrine sedimentary conditions. Sediments which have been altered by post-depositional erosion, such as lag deposits, or by ice-drop or wind blown settlement, show comparable textural modifications. The settlement of silt and clay size particulates, in the marine environment and lakes, may differ slightly because of the chemical differences between salt and fresh water.
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    Whole-lake lead burdens in sediments of lakes in southern Ontario, Canada (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 121-130 
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    ISSN: 1573-5117
    Keywords: sediments ; lead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The anthropogenic stable lead content of the sediments of eight softwater Precambrian lakes in southern Ontario was measured at 34–92 sites per lake. Whole-lake anthropogenic lead burdens varied between only 610 and 770 mg m−2. There was no relationship between lead burden and either water replenishment time of the lake (TW) or the ratio of watershed area to lake area (Ad/A0), which varied by factors of 4 and 12 respectively. These results can be explained if a) the lead deposition in this region is uniform, and b) the only significant input of lead to the lakes is via deposition from the atmosphere directly on the lakes' surfaces. Therefore spatial differences in anthropogenic lead within a lake represent the redistribution or focusing pattern of the sediments.
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    Particle size distribution and chemical parameters of the sediments of a shallow turbid impoundment (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 341-353 
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    ISSN: 1573-5117
    Keywords: Impoundment ; sediments ; particle size ; major ions ; nutrients ; cation exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As part of an ecosystem study of a small mesotrophic turbid impoundment in the semi-arid part of South Africa, an investigation was made of the particle size distribution, organic content and inorganic chemical composition of the sediment. Nine transects 50 m apart were made during February 1980. Sediments were sampled with an Eckman grab. The following analyses were made: size fractionation by wet sieving, cation exchange capacity, exchangeable Na, K, Ca, Mg and PO4, total P, and loss on ignition. From the results it was clear that the finer particles, in or near the original river bed, had higher cation exchange capacity, total P, exchangeable phosphorus and organic content. Littoral areas with avian habitat and extensive macrophyte vegetation, contained coarser sediments. Organic detritus apparently migrated to the deeper part of the impoundment. Sediments of lacustrine and fluvial origin were identified by means of the Passega classification.
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    Lake sediments as recorders of geomagnetic field variations — applications to dating post-Glacial sediments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 587-596 
    Details
    ISSN: 1573-5117
    Keywords: dating ; sediments ; geomagnetic variations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Field and laboratory methods, developed to recover the record of past secular variations of geomagnetic declination and inclination carried by the remanent magnetization of some lake sediments, are described. Type curves, delineating these parameters through post-Glacial time, have now been constructed for Europe and east-central N. America. These curves, once established for any region, are useful for dating lake sediments from that region. The principal inclination features exhibited by the European curves can also be identified along the N. American curves with a delay of some 600 years, on average.
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    Stratigraphic and dynamic effects of sediment reworking by Great Lakes zoobenthos (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 611-622 
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    ISSN: 1573-5117
    Keywords: zoobenthos ; Great Lakes ; sediments ; radionuclides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent sediments of the North American Great Lakes are inhabited by numerous species of macrobenthos which alter the physical and chemical properties of sediments and modify interface transport characteristics. Distributions of such radionuclides as cesium-137, lead-210, and isotopes of plutonium exhibit a zone of constant activity extending down from the sediment-water interface from 1 to 15 cm. Recent studies have confirmed that radiometrically determined mixed depths are consistent with the vertical distribution of oligochaete worms and the amphipod, Pontoporeia hoyi. Generally, 90% of the benthos are contained within the radiometrically defined mixed zone. Where comparisons are possible, rates of sediment reworking by ‘conveyor belt’ species are comparable to or exceed sedimentation rates. Systematic variations in the mixed depth occur within depositional basins with greatest depths tending to be associated with least consolidated, organically rich materials. A quantitative steady-state mixing model accounts satisfactorily for observed radioactivity and heavy metal profiles. Bioturbation appears to be an important process, limiting the resolution with which historical records of particle-associated contaminants may be reconstructed from sediment cores. As bioturbation serves to maintain contact of contaminated sediments with overlying water, this time may also characterize the long-term lake recovery for contaminants removed by burial. As the time varies with location, a mean for an entire lake is not well known, but is on the order of 20 years for Lake Huron.
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    Standardization of methods of analysis for heavy metals in sediments (1982)
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    Hydrobiologia 91-92 (1982), S. 689-695 
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    ISSN: 1573-5117
    Keywords: standardization ; heavy metals ; sediments ; base-line levels ; chemical partition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In studies of heavy metals in sediments, there is a need for standardization of the procedures for sample collection and preservation, chemical analyses and presentation of results. The method and depth of sampling depend on the aim of the investigation and on local sediment conditions, such as consistency of the sediment, rate of sedimentation, diagnetic processes and bioturbation. Therefore no general recommendations can be given in this respect. During collection and preservation, contamination and loss of constituents ust be avoided. In sediments, the best means for estimating total contents of metals is digestion with HF, in combination with strong acids. Other methods include X-ray fluorescence and neutron activation analyses. The use of HF is considered objectionable by some laboratories. A reasonable alternative is aqua regia. Because variations in granular composition affect metal contents, it is advisable to use the fraction 〈 63 μm for the analysis. Chemical partition of sediments provides an insight into the source of metallic constituents, and their pathways to deposition areas. A three-step extraction procedure, in the sequence 0.1 M hydroxylamine-HCl, H2O2 30% and HF, is proposed. Finally, attention is paid to the anthropogenic enrichment of metals in sediments. The establishment of base-line levels is discussed.
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    Whole-lake lead burdens in sediments of lakes in southern Ontario, Canada (1982)
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    Hydrobiologia 91-92 (1982), S. 121-130 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; lead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The anthropogenic stable lead content of the sediments of eight softwater Precambrian lakes in southern Ontario was measured at 34–92 sites per lake. Whole-lake anthropogenic lead burdens varied between only 610 and 770 mg m−2. There was no relationship between lead burden and either water replenishment time of the lake (TW) or the ratio of watershed area to lake area (Ad/A0), which varied by factors of 4 and 12 respectively. These results can be explained if a) the lead deposition in this region is uniform, and b) the only significant input of lead to the lakes is via deposition from the atmosphere directly on the lakes' surfaces. Therefore spatial differences in anthropogenic lead within a lake represent the redistribution or focusing pattern of the sediments.
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    Zinc in water and sediments of two finnish lakes (1982)
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    Hydrobiologia 91-92 (1982), S. 155-160 
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    ISSN: 1573-5117
    Keywords: heavy metals ; zinc ; lakes ; sediments ; pollution ; industrial load ; sedimentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of zinc in Lake Vanajavesi and Lake Mallasvesi, South Finland, was determined on the basis of water and sediment studies. Lake Vanajavesi is one of the most polluted of large inland lakes, in Finland. The zinc load comes mainly from industrial sources. Lake Mallasvesi, situated near Vanajavesi, is in almost natural condition. The water samples were taken by a Ruttner sampler. In collecting sediment samples, a freezing technique was used. The results of zinc analyses indicate that, during several winters, zinc has spread with waste water to different parts of L. Vanaja against the main course of flow. A close correlation between sedimentation of zinc and waste discharge from a textile factory was found in the present study.
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    Model for instream regulation of radioisotopes and heavy metals in riverine waters subjected to a uranium mill discharge (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 175-188 
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    ISSN: 1573-5117
    Keywords: simulation ; sediments ; radioisotopes ; heavy metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the Athabaska sandstone region of northern Saskatchewan, mining and milling of uranium-bearing ore is subjecting, and will continue to subject, surface waters to inputs of soluble heavy metals and uranium and thorium decay series radioisotopes. A mathematical simulation model was developed to assess the role of riverine sediments in regulating soluble concentrations of heavy metals and radioisotopes released to the environment through treated mining and milling process effluents. Specific elements studied included As, Ni, Pb, U, and Ra-226. The model considered that diffusion into sediment porewater and adsorption by sediment particulates from sediment porewater were the two dominant mechanisms regulating sediment loading. Experiments indicated that the equilibrium adsorption behaviour of the heavy metals and radioisotopes studied could be adequately explained using a linear adsorption isotherm, over the range of concentrations expected in the environment. Experimentally determined linear isotherm slopes ranged from 200 ml g−1 to 21 000 ml gl. Diffusion into the effective depth of the sediments (20 cm) was modelled using a quadratic (second order) driving force and a corresponding mass transfer coefficient. The model coefficients were calibrated using field and laboratory data. Results of the modelling suggested that the sediments have a small effect on instream concentrations during the active phases of mining and milling. The sediments were predicted to accumulate sufficient adsorbed mass, during the operational phase of mining and milling, to act as a distributed instream source after completion of milling activities. The significance of this post-operational source was a function of the initial effluent loading, elapsed time and site specific river characteristics.
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    Transport of iron and manganese in relation to the shapes of their concentration-depth profiles (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 463-471 
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    ISSN: 1573-5117
    Keywords: iron ; manganese ; sediments ; water ; transport ; model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A model is presented which describes the transport of iron and manganese in the vicinity of a redox boundary. It is based on input of a particulate component, to form a point source, from which soluble species diffuse along a concentration gradient. The shapes of concentration-depth profiles in marine and freshwater sediments and water columns are reviewed and discussed in terms of the model. Transport, either entirely within a water column or within the sediment, may be simply treated because the rate of vertical transport can be regarded as constant. The discontinuity in the rate of vertical transport which occurs at the sediment-water interface can provide a complicated example of the model, especially when it coincides with the redox boundary. Authigenic mineral formation processes can modify the model, sometimes to such an extent that it becomes invalid. This is particularly true for soluble iron profiles in organically rich marine sediments. Sampling interval is critical to the resultant profile shape and must be relevant to the particular environment, e.g. metres in water columns and millimetres in sediments. The differences in the rates of reduction and oxidation of iron and manganese tend to modify both the position of the profile with respect to the redox-cline and its stage of development in a seasonally anoxic system. It is these factors which determine why most of the iron which reaches a sediment is permanently incorporated whereas manganese is re-released. This mechanism determines the average ratio of iron to manganese in sedimentary rocks. The development of peaked profile shapes in water columns implies that under certain conditions dissolved iron and manganese may be transported from the water column to the pore waters of the sediment.
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    Lake sediments as recorders of geomagnetic field variations — applications to dating post-Glacial sediments (1982)
    Springer
    Hydrobiologia 91-92 (1982), S. 587-596 
    Details
    ISSN: 1573-5117
    Keywords: dating ; sediments ; geomagnetic variations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Field and laboratory methods, developed to recover the record of past secular variations of geomagnetic declination and inclination carried by the remanent magnetization of some lake sediments, are described. Type curves, delineating these parameters through post-Glacial time, have now been constructed for Europe and east-central N. America. These curves, once established for any region, are useful for dating lake sediments from that region. The principal inclination features exhibited by the European curves can also be identified along the N. American curves with a delay of some 600 years, on average.
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    Stratigraphic and dynamic effects of sediment reworking by Great Lakes zoobenthos (1982)
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    Hydrobiologia 91-92 (1982), S. 611-622 
    Details
    ISSN: 1573-5117
    Keywords: zoobenthos ; Great Lakes ; sediments ; radionuclides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent sediments of the North American Great Lakes are inhabited by numerous species of macrobenthos which alter the physical and chemical properties of sediments and modify interface transport characteristics. Distributions of such radionuclides as cesium-137, lead-210, and isotopes of plutonium exhibit a zone of constant activity extending down from the sediment-water interface from 1 to 15 cm. Recent studies have confirmed that radiometrically determined mixed depths are consistent with the vertical distribution of oligochaete worms and the amphipod,Pontoporeia hoyi. Generally, 90% of the benthos are contained within the radiometrically defined mixed zone. Where comparisons are possible, rates of sediment reworking by ‘conveyor belt’ species are comparable to or exceed sedimentation rates. Systematic variations in the mixed depth occur within depositional basins with greatest depths tending to be associated with least consolidated, organically rich materials. A quantitative steady-state mixing model accounts satisfactorily for observed radioactivity and heavy metal profiles. Bioturbation appears to be an important process, limiting the resolution with which historical records of particle-associated contaminants may be reconstructed from sediment cores. As bioturbation serves to maintain contact of contaminated sediments with overlying water, this time may also characterize the long-term lake recovery for contaminants removed by burial. As the time varies with location, a mean for an entire lake is not well known, but is on the order of 20 years for Lake Huron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940150
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    Electronic Resource
    Gas chromatographic determination of total amino acids and protein in sediments using the ninhydrin-CO2 reaction (1982)
    Springer
    Hydrobiologia 97 (1982), S. 81-86 
    Details
    ISSN: 1573-5117
    Keywords: amino acids ; protein ; sediments ; ninhydrin reaction ; gas chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A sensitive modification of the ninhydrin-CO2 method involving the gas chromatographic determination of the total protein and amino acid content of sediment is described. The method gives a linear response over the amino acid concentration range 10−5 M to 4 × 10−2 M. It can be used for whole sediment, hydrolysates and interstitial water. The performance of the method is compared with the fluorescamine method for primary amines.
    Type of Medium: Electronic Resource
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    Reexamination of acoustic evidence in the Kennedy assassination. Committee on Ballistic Acoustics, National Research Council (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-10-08
    Description: Sounds recorded in Dallas at the time of the assassination of John F. Kennedy were analyzed by two research groups, whose reports formed the basis for the opinion that two gunmen fired at President Kennedy. These reports and the acoustic evidence have been studied by the Committee on Ballistic Acoustics, and further acoustic analyses, including sound spectrograms, have been performed. The committee finds that the acoustic data do not support a conclusion that a second gunman was involved in the assassination.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1982 Oct 8;218(4568):127-33.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6750789" target="_blank"〉PubMed〈/a〉
    Keywords: Acoustics ; *Famous Persons ; *Forensic Medicine ; History, 20th Century ; Humans ; Male ; Texas ; *Wounds, Gunshot
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Mycotoxin weapons (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-08-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1982 Aug 27;217(4562):776-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7100923" target="_blank"〉PubMed〈/a〉
    Keywords: Asia, Southeastern ; *Biological Warfare ; Humans ; *Mycotoxins
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Chromatic valence curves: alternative interpretation derived by the direct matching method (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-03-19
    Description: The amount of red chromatic valence of the red-green opponent colors channel of the human visual system has been reported to be greatly reduced in short wavelengths when the hue-matching method is used to measure red valence instead of the more typical cancellation method. Receptive fields with a silent surround were postulated to explain the reduction, and it was emphasized that the reduced valence curve represented the true chromatic valence curve of the visual system. In the present studies the previous results are interpreted to be a direct consequence of the method and the particular matching stimuli used. It is shown that the reduction can be explained by the existing color-matching data without appealing to the silent surround hypothesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ayama, M -- Ikeda, M -- New York, N.Y. -- Science. 1982 Mar 19;215(4539):1538-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7063866" target="_blank"〉PubMed〈/a〉
    Keywords: Color Perception/*physiology ; Humans ; Vision, Ocular/*physiology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Gene transfer between eukaryotes (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-09-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Benveniste, R E -- Todaro, G J -- New York, N.Y. -- Science. 1982 Sep 24;217(4566):1202.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7112123" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Physiological Phenomena ; Eukaryotic Cells/*physiology ; Humans ; *Recombination, Genetic ; Retroviridae/genetics
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Mice regrow the tips of their foretoes (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-08-20
    Description: Mice will replace the tip of a foretoe when it is amputated distal to the last interphalangeal joint. Amputation of the digit more proximal to the joint does not result in regrowth of the foretoe. Though this growth shares certain similarities with the epimorphic regeneration of amphibian limbs, the two processes are not the same. The regrowth reported here in mice is probably similar to the scattered clinical reports of fingertips regeneration in children, and presents a model system with which to explore the controls of wound healing and tissue reconstruction in mammals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Borgens, R B -- CA 20920/CA/NCI NIH HHS/ -- NS 18456/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1982 Aug 20;217(4561):747-50.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7100922" target="_blank"〉PubMed〈/a〉
    Keywords: Amputation ; Animals ; Child ; Humans ; Mice ; Mice, Inbred C3H ; *Regeneration ; Toe Joint ; Toes/anatomy & histology/*physiology ; Wound Healing
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Nonsmokers and cigarette smoke: a modified perception of risk (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-01-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bock, F G -- New York, N.Y. -- Science. 1982 Jan 8;215(4529):197.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7053573" target="_blank"〉PubMed〈/a〉
    Keywords: Humans ; Risk ; *Smoking ; *Tobacco Smoke Pollution
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Researcher denied future U.S. funds (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-06-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Broad, William J -- New York, N.Y. -- Science. 1982 Jun 4;216(4550):1081.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11643749" target="_blank"〉PubMed〈/a〉
    Keywords: *Federal Government ; *Financial Support ; *Financing, Government ; *Fraud ; *Government ; Government Regulation ; *Human Experimentation ; Humans ; Neoplasms ; Pharmaceutical Preparations ; Public Policy ; *Research Personnel ; *Scientific Misconduct ; Social Control, Formal ; Social Responsibility ; United States Dept. of Health and Human Services
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Publisher settles suit, says clone book is a fake (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-04-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Broad, William J -- New York, N.Y. -- Science. 1982 Apr 23;216(4544):391.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11643742" target="_blank"〉PubMed〈/a〉
    Keywords: *Cloning, Organism ; *Fraud ; History, 20th Century ; Humans ; Jurisprudence ; Literature
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Radioactivity in the Urals (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-07-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1982 Jul 16;217(4556):198, 200.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089554" target="_blank"〉PubMed〈/a〉
    Keywords: Humans ; *Radioactive Fallout ; *Radioactive Pollutants ; *Rural Population ; Ussr
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    T-lymphocyte immunology and hominoid evolution (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-12-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cartmill, M -- New York, N.Y. -- Science. 1982 Dec 10;218(4577):1145.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6983135" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Humans ; Primates/*genetics ; T-Lymphocytes/*immunology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Topological structure in visual perception (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-11-12
    Description: Three experiments on tachistoscopic perception of visual stimuli demonstrate that the visual system is sensitive to global topological properties. The results indicate that extraction of global topological properties is a basic factor in perceptual organization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, L -- New York, N.Y. -- Science. 1982 Nov 12;218(4573):699-700.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7134969" target="_blank"〉PubMed〈/a〉
    Keywords: *Form Perception ; Humans ; *Visual Perception
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    Phosphoglucomutase: evidence for a new locus expressed in human milk (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-05-07
    Description: Electrophoretic study of phosphoglucomutase (PGM) in human milk revealed different patterns that can be explained by the existence of a locus distinct from the common PGM1, PGM2, and PGM3. One hundred and forty samples were tested and the results showed four different alleles of PGM4 whose frequencies were under Hardy-Weinberg equilibrium.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cantu, J M -- Ibarra, B -- New York, N.Y. -- Science. 1982 May 7;216(4546):639-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6461922" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Erythrocytes/enzymology ; Female ; Gene Expression Regulation ; Humans ; Isoenzymes/genetics ; Milk, Human/*enzymology ; Phenotype ; Phosphoglucomutase/*genetics
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    OSHA policy on carcinogens (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-09-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cowan, M D -- New York, N.Y. -- Science. 1982 Sep 3;217(4563):884.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7112101" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Carcinogens ; Humans ; Occupational Diseases/chemically induced ; United States ; *United States Occupational Safety and Health Administration
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Autoantibodies to nucleosomal proteins: antibodies to HMG-17 in autoimmune diseases (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-03-05
    Description: The relative amounts of autoantibodies against defined nucleosomal proteins present in serums from patients with systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), and mixed connective tissue disease (MCTD) have been examined by an enzyme-linked immunoassay. Autoantibodies to nucleosomal proteins were detected in 45 percent of the patients with SLE, 18 percent of the MCTD patients, and none of the RA patients. The results suggest that, in SLE, antibodies are formed against a subset of nucleosomes which contain protein HMG-17.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bustin, M -- Reisch, J -- Einck, L -- Klippel, J H -- New York, N.Y. -- Science. 1982 Mar 5;215(4537):1245-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6460317" target="_blank"〉PubMed〈/a〉
    Keywords: Arthritis, Rheumatoid/immunology ; Autoimmune Diseases/*immunology ; Chromosomal Proteins, Non-Histone/*immunology ; High Mobility Group Proteins ; Humans ; Lupus Erythematosus, Systemic/immunology ; Mixed Connective Tissue Disease/immunology ; Nucleosomes/*immunology
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    Theory and observation in cultural transmission (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-10-01
    Description: Cultural phenomena may show considerable stability over time and space. Transmission mechanisms responsible for their maintenance are worthy of theoretical and empirical inquiry; they are complex and each possible pathway has different effects on evolutionary stability of traits, as can be shown theoretically. A survey designed to evaluate the importance of some components of cultural transmission on a variety of traits showed that religion and politics are mostly determined in the family, a mode of transmission which guarantees high evolutionary stability and maintenance of high variation between and within groups.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cavalli-Sforza, L L -- Feldman, M W -- Chen, K H -- Dornbusch, S M -- 10452/PHS HHS/ -- 20467/PHS HHS/ -- 20816/PHS HHS/ -- New York, N.Y. -- Science. 1982 Oct 1;218(4567):19-27.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7123211" target="_blank"〉PubMed〈/a〉
    Keywords: Attitude ; Child ; Cultural Characteristics ; *Culture ; Family ; Female ; Humans ; *Interpersonal Relations ; Male ; Marriage ; Models, Psychological ; *Parent-Child Relations
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    Development of mouse embryos in vitro: preimplantation to the limb bud stage (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-10-01
    Description: Mouse embryos were grown successfully in vitro from the blastocyst stage to the limb bud stage. Mouse blastocysts grown in vitro for 10 days showed blood circulation in the yilk sac, forelimb buds, and the primordia of liver, pancreas, and lungs. These characteristics are indicative of a developmental stage equivalent to one-half of the total gestation period in utero. Improvements in culture conditions from days 7 to 9 have made it feasible to culture mouse blastocysts beyond the early somite stage.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, L T -- Hsu, Y C -- AM 19535/AM/NIADDK NIH HHS/ -- AM 28550/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1982 Oct 1;218(4567):66-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7123220" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blastocyst/*physiology ; Cell Differentiation ; Culture Media ; Culture Techniques ; Embryo, Mammalian/*physiology ; Female ; Fetal Blood ; Humans ; Mice ; Pregnancy ; Yolk Sac/physiology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    A new subtype of human T-cell leukemia virus (HTLV-II) associated with a T-cell variant of hairy cell leukemia (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-11-05
    Description: Human T-cell leukemia virus (HTLV) is a human type-C RNA tumor virus (retrovirus) previously identified in and isolated from several patients with T-cell leukemias or lymphomas. The known virus isolates from the United States and Japan are closely related and are found in adults with an acute malignancy of mature T cells. A related retrovirus has been found in a patient (Mo) with a somewhat different disease (a T-cell variant of relatively benign hairy cell leukemia). Serum from Mo contains antibodies to the major internal core protein (p24) of HTLV. A T-cell line established from the spleen of Mo expresses HTLV antigens. However, HTLV from Mo is significantly different from all previous HTLV isolates in immunological cross-reactivity tests of p24. The usual prototype HTLV isolate is represented as HTLV-I, and the HTLV from Mo is represented as HTLV-II. Individual members of each subgroup may then be identified by subscript initials of the patient [for example, HTLV-I(CR), HTLV-I(MB), and HTLV-II(Mo)].〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kalyanaraman, V S -- Sarngadharan, M G -- Robert-Guroff, M -- Miyoshi, I -- Golde, D -- Gallo, R C -- New York, N.Y. -- Science. 1982 Nov 5;218(4572):571-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6981847" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies, Viral/analysis ; Humans ; Leukemia, Hairy Cell/*microbiology ; Retroviridae/immunology/*isolation & purification ; T-Lymphocytes/*immunology/microbiology
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    Monoclonal antibody to acetylcholine receptor: cell line established from thymus of patient with Myasthenia gravis (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-02-19
    Description: A human B cell line producing a monoclonal antibody to an antigenic determinant of acetylcholine receptors was established by cloning B cells that had been transformed in vitro by Epstein-Barr virus. The B cells were obtained from the thymus of a patient with myasthenia gravis. The antibody produced by the cell line precipitated acetylcholine receptors from denervated and innervated rat muscle and from human muscle, but did not show detectable response to the acetylcholine receptors from the electric organs of Narke japonica. The monoclonal antibody showed identical binding patterns in innervated and denervated rat muscles. Passive transfer of the monoclonal antibody into rats induced moderate muscle weakness and electromyographic changes characteristic of myasthenia gravis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kamo, I -- Furukawa, S -- Tada, A -- Mano, Y -- Iwasaki, Y -- Furuse, T -- Ito, N -- Hayashi, K -- Satoyoshi, E -- New York, N.Y. -- Science. 1982 Feb 19;215(4535):995-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6297000" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antibodies, Monoclonal ; B-Lymphocytes/immunology ; *Cell Line ; Cell Transformation, Viral ; Herpesvirus 4, Human ; Humans ; Muscles/immunology/innervation ; Myasthenia Gravis/immunology ; Rats ; Receptors, Cholinergic/*immunology
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    Human immunoglobulin heavy chain genes map to a region of translocations in malignant B lymphocytes (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-04-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kirsch, I R -- Morton, C C -- Nakahara, K -- Leder, P -- New York, N.Y. -- Science. 1982 Apr 16;216(4543):301-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6801764" target="_blank"〉PubMed〈/a〉
    Keywords: B-Lymphocytes/*physiology ; Chromosome Mapping ; Genes ; Humans ; Immunoglobulin Heavy Chains/*genetics ; Leukemia/*genetics ; Recombination, Genetic ; Translocation, Genetic
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Fetal hemoglobin genes turned on in adults (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-12-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kolata, G -- New York, N.Y. -- Science. 1982 Dec 24;218(4579):1295-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6183747" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Anemia, Sickle Cell/therapy ; Azacitidine/therapeutic use ; Fetal Hemoglobin/biosynthesis/*genetics ; Hemoglobin, Sickle/biosynthesis ; Humans ; Male ; Thalassemia/therapy
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Heart study produces a surprise result (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-10-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kolata, G -- New York, N.Y. -- Science. 1982 Oct 1;218(4567):31-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7123213" target="_blank"〉PubMed〈/a〉
    Keywords: Diuretics/*adverse effects ; Heart Diseases/*drug therapy ; Humans ; National Institutes of Health (U.S.) ; Risk ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    On the origin of introns (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-09-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lewin, R -- New York, N.Y. -- Science. 1982 Sep 3;217(4563):921-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7112105" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Base Sequence ; *Genes ; Humans
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Heterogeneity in epidermal basal keratinocytes: morphological and functional correlations (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-03-05
    Description: Two structurally distinct populations of basal keratinocytes, nonserrated and serrated, were observed in cynomolgus monkey and human palm epidermis. Anatomical location, fine structural features, and kinetic properties suggest that nonserrated cells represent a stem cell population and that serrated cells help anchor the epidermis to the dermis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lavker, R M -- Sun, T T -- AM 25140/AM/NIADDK NIH HHS/ -- EY 00125/EY/NEI NIH HHS/ -- EY 02472/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1982 Mar 5;215(4537):1239-41.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7058342" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Division ; Cell Nucleus/metabolism ; Epidermis/*cytology ; Hand ; Humans ; Macaca fascicularis
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Rabies treatment (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-10-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lele, R D -- New York, N.Y. -- Science. 1982 Oct 8;218(4568):110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7123224" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dogs ; Humans ; Medicine, Ayurvedic ; Plant Extracts/*therapeutic use ; *Plants, Medicinal ; Rabies/*prevention & control
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Spectral character of sunlight modulates photosynthesis of previtamin D3 and its photoisomers in human skin (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-05-28
    Description: The photosynthesis of previtamin D3 from 7-dehydrocholesterol in human skin was determined after exposure to narrow-band radiation or simulated solar radiation. The optimum wavelengths for the production of previtamin D3 were determined to be between 295 and 300 nanometers. When human skin was exposed to 295-nanometer radiation, up to 65 percent of the original 7-dehydrocholesterol content was converted to previtamin D3. In comparison, when adjacent skin was exposed to simulated solar radiation, the maximum formation of previtamin D3 was about 20 percent. Major differences in the formation of lumisterol3, and tachysterol3 from previtamin D3 were also observed. It is concluded that the spectral character of natural sunlight has a profound effect on the photochemistry of 7-dehydrocholesterol in human skin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉MacLaughlin, J A -- Anderson, R R -- Holick, M F -- AM 27334/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1982 May 28;216(4549):1001-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6281884" target="_blank"〉PubMed〈/a〉
    Keywords: Cholecalciferol/*biosynthesis/metabolism ; Dehydrocholesterols/radiation effects ; Ergosterol/metabolism ; Humans ; In Vitro Techniques ; Isomerism ; Photochemistry ; Skin/*metabolism ; Spectrum Analysis ; Structure-Activity Relationship ; Ultraviolet Rays
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    How did humans evolve big brains? (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-05-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lewin, R -- New York, N.Y. -- Science. 1982 May 21;216(4548):840-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079741" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Brain/*anatomy & histology ; Energy Metabolism ; Humans ; Primates/*anatomy & histology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Natural antibodies to human retrovirus HTLV in a cluster of Japanese patients with adult T cell leukemia (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-02-19
    Description: Human T cell lymphoma leukemia virus (HTLV) is a human retrovirus (RNA tumor virus) that was originally isolated from a few patients with leukemias or lymphomas involving mature T lymphocytes. Here we report that the serum of Japanese patients with adult T cell leukemia, but not the serum of tested normal donors, contains high titers of antibodies to HTLV. These observations, together with data from Japan showing that adult T cell leukemia is endemic in southwest Japan, suggest that HTLV is involved in a subtype of human T cell malignancy, including Japanese adult T cell leukemia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Robert-Guroff, M -- Nakao, Y -- Notake, K -- Ito, Y -- Sliski, A -- Gallo, R C -- New York, N.Y. -- Science. 1982 Feb 19;215(4535):975-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6760397" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies, Viral/*analysis ; Antibody Specificity ; Fluorescent Antibody Technique ; Humans ; Japan ; Leukemia/*immunology ; Radioimmunoassay ; Retroviridae/*immunology ; *T-Lymphocytes
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Identification of the constant chromosome regions involved in human hematologic malignant disease (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-05-14
    Description: Specific consistent chromosome translocations are regularly observed in certain human leukemias and lymphomas. For the myeloid leukemias, the constant recombinants are: the long arm of 9 to chromosome 22 in chronic myeloid leukemia, the long arm of 21 to chromosome 8 in acute myeloblastic leukemia, and the long arm of 17 to chromosome 15 in acute promyelocytic leukemia. Three related translocations are seen in Burkitt lymphoma and B cell acute lymphocytic leukemia; in each one, chromosome 8 is involved with chromosome 2, 14, or 22. Analysis of a complex translocation affecting chromosomes 8 and 14 indicates that the translocation of chromosome 8 to chromosome 14 is the critical constant rearrangement. The analysis of the DNA at the translocation sites of these chromosomes, rather than the reciprocal of each translocation, appears to be the most productive focus for initial study. The various immunoglobulin loci are located in chromosomes 2, 14, and 22, the chromosomes regularly involved in translocations in Burkitt lymphoma and B cell acute lymphocytic leukemia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rowley, J D -- CA 16910/CA/NCI NIH HHS/ -- CA 19266/CA/NCI NIH HHS/ -- CA 25568/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1982 May 14;216(4547):749-51.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079737" target="_blank"〉PubMed〈/a〉
    Keywords: *Chromosome Aberrations ; Chromosomes, Human, 13-15 ; Chromosomes, Human, 16-18 ; Chromosomes, Human, 21-22 and Y ; Chromosomes, Human, 6-12 and X ; Genes ; Humans ; Immunoglobulins/*genetics ; Leukemia/*genetics ; Lymphoma/*genetics ; Translocation, Genetic
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    Sugar and dental caries: a review of human studies (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-07-30
    Description: Studies of special population groups, epidemiological surveys, controlled longitudinal studies of humans, and longitudinal studies on the effect of sugar substitutes indicate that frequent or high intake of sugary foods predisposes to dental decay. The relation is not always clear-cut, and most studies have important methodological problems and limitations. Longitudinal measurements of caries increments combined with multiple dietary histories are needed to clarity the association between caries and eating habits. The relative cariogenicity of specific foods can be assessed by a combination of in vitro tests, human in vivo tests, and experimental caries in animals. Human diets, however, vary in food items eaten and the frequency and sequence of eating, and these factors can affect the cariogenicity of a food. Therefore, reported correlations must be interpreted with caution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Newbrun, E -- New York, N.Y. -- Science. 1982 Jul 30;217(4558):418-23.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7046052" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Cariogenic Agents ; Child ; Child, Preschool ; Dental Caries/epidemiology/*etiology ; *Diet, Cariogenic ; Food Habits ; Food Preferences ; Humans ; Longitudinal Studies ; Sucrose/adverse effects/metabolism ; Sweetening Agents/pharmacology
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    Benzodiazepine receptor-mediated experimental "anxiety" in primates (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-12-24
    Description: The ethyl ester of beta-carboline-3-carboxylic acid has a high affinity for benzodiazepine receptors in the brain. In the rhesus monkey this substance produces an acute behavioral syndrome characterized by dramatic elevations in heart rate, blood pressure, plasma cortisol, and catecholamines. The effects are blocked by benzodiazepines and the specific benzodiazepine receptor antagonist Ro 15-1788. The benzodiazepine receptor may consist of several subsites or functional domains that independently recognize agonist, antagonists, or "active" antagonists such as beta-carboline-3-carboxylic acid ethyl ester. These results suggest that the benzodiazepine receptor is involved in both the affective and physiological manifestations of anxiety, and that the administration of beta-carboxylic acid ethyl ester to monkeys may provide a reliable and reproducible animal model of human anxiety.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ninan, P T -- Insel, T M -- Cohen, R M -- Cook, J M -- Skolnick, P -- Paul, S M -- New York, N.Y. -- Science. 1982 Dec 24;218(4579):1332-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6293059" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anxiety/*etiology ; Benzodiazepinones ; Blood Pressure/drug effects ; Carbolines/pharmacology ; *Disease Models, Animal ; Epinephrine/pharmacology ; Flumazenil ; Heart Rate/*drug effects ; Humans ; Hydrocortisone/blood ; Macaca mulatta ; Male ; Norepinephrine/pharmacology ; Receptors, Drug/*physiology ; Receptors, GABA-A
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    No fraud found in alcoholism study (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-11-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Norman, C -- New York, N.Y. -- Science. 1982 Nov 19;218(4574):771.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7134972" target="_blank"〉PubMed〈/a〉
    Keywords: *Alcoholism ; *Behavioral Research ; Fraud ; Humans ; *Research ; United States ; allegations that they fabricated data in a project on treatment of alcoholics. ; Their research, which suggested that some alcoholics can reject abstinence and ; learn to moderate their drinking, was disputed by other researchers. The ; investigating committee did not judge whether alcoholics can indeed become ; moderate drinkers but concluded that the Sobells had carried out the research as ; reported except for one lapse ascribed to carelessness. The procedures of the ; committee, which was appointed by the Addiction Research Foundation where the ; Sobells are now employed, have been questioned by critics.
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    Scientists implicated in atom test deception (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-11-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, R Jeffrey -- New York, N.Y. -- Science. 1982 Nov 5;218(4572):545-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11643806" target="_blank"〉PubMed〈/a〉
    Keywords: Coercion ; *Deception ; Federal Government ; Government ; *Hazardous Substances ; Humans ; Information Dissemination ; Information Services ; Judicial Role ; Jurisprudence ; Nevada ; Nuclear Warfare ; *Public Policy ; *Radiation ; *Research Personnel ; *Scientific Misconduct ; Utah ; Atomic Energy Commission officials suppressed data indicating a link between two ; 1953 atomic bomb tests in Nevada and sheep deaths in neighboring Utah, and then ; pressured scientific investigators to concur with the AEC position. In a 1956 ; trial, a federal judge denied compensation to the sheep owners. Evidence of the ; deception came to light in 1979 and 1980 and, on 24 August 1982, the same judge ; ordered a new trial, ruling that several AEC attorneys and scientists had indeed ; misrepresented the facts. His ruling has been appealed by the Department of ; Justice.
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    The risks of living near Love Canal (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-08-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, R J -- New York, N.Y. -- Science. 1982 Aug 27;217(4562):808-9, 811.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7100924" target="_blank"〉PubMed〈/a〉
    Keywords: *Chemical Industry ; Humans ; *Industrial Waste ; Risk ; United States
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    Color vision is altered during the suppression phase of binocular rivalry (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-11-19
    Description: Increment-threshold spectral sensitivity functions were determined during the dominance and suppression phases of binocular rivalry. The shapes of the functions obtained during the dominance phase exhibited three maxima at approximately 440, 530, and 610 nanometers and resembled functions obtained for nonrivalrous control conditions. However, the functions measured during suppression had a single broad peak near 555 nanometers and were adequately described by functions measured with flicker methods during nonrivalrous conditions. The results indicate that binocular rivalry differentially attenuates opponent-color information relative to achromatic information.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, E L -- Levi, D M -- Harwerth, R S -- White, J M -- EY01139/EY/NEI NIH HHS/ -- EY01728/EY/NEI NIH HHS/ -- EY03611/EY/NEI NIH HHS/ -- R01 EY001139/EY/NEI NIH HHS/ -- R01 EY003611/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1982 Nov 19;218(4574):802-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7134975" target="_blank"〉PubMed〈/a〉
    Keywords: *Color Perception ; Functional Laterality ; Humans ; Ocular Physiological Phenomena ; Sensory Thresholds ; *Vision, Ocular
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    Norethisterone, a major ingredient of contraceptive pills, is a suicide inhibitor of estrogen biosynthesis (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-03-05
    Description: Norethisterone (17 alpha-ethynyl-19-nortestosterone) is an effective irreversible inhibitor of estrogen synthetase (aromatase), the enzyme responsible for the conversion of androgens to estrogens, even at a 2 X 10(-6) molar concentration. This irreversible inactivation, which is directed toward the active site of aromatase and requires the cofactor-reduced nicotinamide adenine dinucleotide phosphate, is both time- and concentration-dependent. Ethisterone (17 alpha-ethynyltestosterone), in contrast, is not a suicide inhibitor of aromatase even at concentrations of 10(-4) molar.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Osawa, Y -- Yarborough, C -- HDO4945/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1982 Mar 5;215(4537):1249-51.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7058343" target="_blank"〉PubMed〈/a〉
    Keywords: *Aromatase Inhibitors ; Binding Sites/drug effects ; Contraceptives, Oral/*pharmacology ; Estrogens/*biosynthesis ; Female ; Humans ; Kinetics ; Microsomes/enzymology ; Norethindrone/*pharmacology ; Oxidoreductases/*antagonists & inhibitors ; Placenta/enzymology ; Pregnancy
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    Chinese decry dishonesty in scientific research (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-11-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, Marjorie -- New York, N.Y. -- Science. 1982 Nov 26;218(4575):871.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11643817" target="_blank"〉PubMed〈/a〉
    Keywords: China ; *Fraud ; Humans ; *Research Personnel ; Science ; *Scientific Misconduct ; similar to those that have been troubling the American scientific community. ; Several articles are cited which report cases of fabrication of data, plagiarism, ; or unfair claims to authorship. A Chinese scientific journal has begun a regular ; column on ethics in science, and researchers have drafted a code of ethics for ; the Peking scientific community.
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    Washington set to act on heptachlor in milk (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-09-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, R J -- New York, N.Y. -- Science. 1982 Sep 3;217(4563):912-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6896767" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Food Contamination ; *Heptachlor ; Humans ; *Milk
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    OSHA's new thoughts on cancer policy (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-07-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, M -- New York, N.Y. -- Science. 1982 Jul 2;217(4554):35.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089538" target="_blank"〉PubMed〈/a〉
    Keywords: *Carcinogens ; *Government Agencies ; Humans ; Neoplasms/chemically induced/*prevention & control ; Risk ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 81
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    Lethal effect of phenothiazine neuroleptics on the pathogenic protozoan Leishmania donovani (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-07-23
    Description: Phenothiazine drugs, which are widely used for their antipsychotic, antianxiety, and antiemetic effects, have been found to have protozoacidal effects on the human pathogen Leishmania donovani. These compounds are lethal to both the extracellular stage of the organism, which is inoculated into humans by the sand fly, and the intracellular stage, which is found solely in human macrophages during established infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pearson, R D -- Manian, A A -- Harcus, J L -- Hall, D -- Hewlett, E L -- New York, N.Y. -- Science. 1982 Jul 23;217(4557):369-71.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6124040" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antipsychotic Agents/*pharmacology/therapeutic use ; Chlorpromazine/pharmacology ; Cricetinae ; Humans ; Leishmania/*drug effects ; Leishmaniasis, Visceral/*drug therapy ; Macrophages/microbiology ; Mesocricetus
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  • 82
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    Cholinergic innervation in neuritic plaques (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-04-23
    Description: Although several studies of Alzheimer's disease suggest that the frequency of neuritic plaques in the cerebral cortex is correlated with the severity of dementia and with reduction in presynaptic cholinergic markers in the cortex, the relationship between cholinergic cortical innervation and the pathogenesis of plaques is unknown. The hypothesis was tested that the neurites in the plaque consist, in part, of presynaptic cholinergic axons, many of which arise from neurons in the basal forebrain. This hypothesis was tested by analyzing the character and distribution of plaques in monkeys, aged 4 to 31 years, with staining for acetylcholin-esterase and also with Congo red and silver stains. Immature and mature plaques were rich in acetylcholinesterase. As the plaques matured, the amount of amyloid increased, and the number of neurites and the activity of acetylcholinesterase decreased. End-stage amyloid-rich plaques lacked acetylcholinesterase. These observations indicate that changes in cortical cholinergic innervation are an important feature in the pathogenesis and evolution of the neuritic plaque.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Struble, R G -- Cork, L C -- Whitehouse, P J -- Price, D L -- NS 07179/NS/NINDS NIH HHS/ -- NS 10580/NS/NINDS NIH HHS/ -- NS 15721/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1982 Apr 23;216(4544):413-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6803359" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholinesterase/*metabolism ; Aging ; Alzheimer Disease/metabolism/*pathology ; Amyloid/*metabolism ; Animals ; Dementia/*pathology ; Disease Models, Animal ; Haplorhini ; Humans ; Nerve Degeneration ; Neurons/metabolism
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  • 83
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    Risk estimate vanishes from benzene report (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-09-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sun, M -- New York, N.Y. -- Science. 1982 Sep 3;217(4563):914-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7112104" target="_blank"〉PubMed〈/a〉
    Keywords: Benzene/*adverse effects ; Federal Government ; Government Regulation ; Humans ; *Information Dissemination ; Internationality ; Occupational Diseases/*etiology ; *Professional Misconduct ; Risk ; International Agency for Research on Cancer (IARC) deleted a scientific advisory ; group's estimate of the risk of leukemia in workers exposed to small amounts of ; the chemical. Allegations are reported that the estimate, which would have had ; regulatory implications for U.S. industry, was omitted because the National ; Cancer Institute (NCI), responding to industry complaints about the data, ; cautioned the IARC director to refrain from quantitative risk assessment in its ; NCI-funded monographs.
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  • 84
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    Developmental equations for postural tremor (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-01-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tryon, W W -- New York, N.Y. -- Science. 1982 Jan 15;215(4530):300-1.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7053579" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Age Factors ; Brain/growth & development/*physiopathology ; Child ; Child, Preschool ; Electroencephalography ; Humans ; Infant ; Tremor/*physiopathology
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  • 85
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    Human aldehyde dehydrogenase: mechanism of inhibition of disulfiram (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-05-07
    Description: Disulfiram labeled with carbon-14 reacts specifically with human liver aldehyde dehydrogenase E1 with loss of catalytic activity and no incorporation of label. Carbon-14-labeled diethyldithiocarbamate is formed and the number of enzyme sulfhydryl groups decreases from 34 to 30 during this process. Activity is recovered by-mercaptoethanol but not by glutathione, the physiological reducing agent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vallari, R C -- Pietruszko, R -- AA 00186/AA/NIAAA NIH HHS/ -- K0200046/PHS HHS/ -- New York, N.Y. -- Science. 1982 May 7;216(4546):637-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7071604" target="_blank"〉PubMed〈/a〉
    Keywords: Aldehyde Dehydrogenase ; Aldehyde Oxidoreductases/*antagonists & inhibitors ; Cytoplasm/enzymology ; Disulfiram/*pharmacology ; Humans ; Isoenzymes/antagonists & inhibitors ; Liver/enzymology ; Oxidation-Reduction ; Sulfhydryl Compounds/antagonists & inhibitors
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  • 86
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    Cytomegalovirus antibody in cerebrospinal fluid of schizophrenic patients detected by enzyme immunoassay (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-05-21
    Description: By means of enzyme immunoassay techniques to detect the presence of antibody to cytomegalovirus, the cerebrospinal fluid of 178 patients with schizophrenia, 17 patients with bipolar disorders, and 11 other psychiatric patients was compared with that of 79 neurological patients and 41 normal control subjects. The cerebrospinal fluid of 20 of the schizophrenic patients and 3 of the patients with bipolar disorders showed significant increases in immunoglobulin M antibody to cytomegalovirus; no difference was found in patients on or off psychotropic medications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Torrey, E F -- Yolken, R H -- Winfrey, C J -- N01 AI 92616/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1982 May 21;216(4548):892-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6281883" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies, Viral/analysis ; Bipolar Disorder/immunology/microbiology ; Cytomegalovirus/immunology ; Cytomegalovirus Infections/*complications ; Humans ; Immunoglobulin M/analysis ; Schizophrenia/immunology/*microbiology
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  • 87
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    Agricultural research and Third World food production (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-07-16
    Description: By the close of this century the world may have to feed as many as 2 billion additional people. Most of them will be born in developing countries, especially in marginal lands ill-suited for food production. This article focuses on efforts by the International Agricultural Research Centers to increase food production in the Third World and addresses the social and ecological issues raised by the introduction of high-yielding varieties into fertile Third World lands and describe how varieties are being tailored for introduction into marginal areas.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Plucknett, D L -- Smith, N J -- New York, N.Y. -- Science. 1982 Jul 16;217(4556):215-20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089555" target="_blank"〉PubMed〈/a〉
    Keywords: *Agriculture ; *Developing Countries ; Ecology ; *Food Supply ; Humans ; *Research
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 88
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    Breast-feeding patterns in low-income countries (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-12-10
    Description: Breast-feeding is important to infant nutrition, morbidity, and mortality, and to postpartum amenorrhea (hence to birth intervals). Evidence on breast-feeding patterns in low-income countries from nationally representative World Fertility Surveys and secondary sources shows that in all but a few such countries most children are breast-fed for at least a few months. The limited evidence available on trends seems to indicate a decline in the duration of breast-feeding, but in most of Asia and Africa breast-feeding is almost universal during at least the first 6 months. Earlier weaning is common in Latin America.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Popkin, B M -- Bilsborrow, R E -- Akin, J S -- New York, N.Y. -- Science. 1982 Dec 10;218(4577):1088-93.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7146896" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Asia ; *Breast Feeding ; *Developing Countries ; Female ; Humans ; Rural Population ; South America ; Time Factors ; Urban Population
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  • 89
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    Systemic lupus erythematosus: presence in human serum of an unusual acid-labile leukocyte interferon (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-04-23
    Description: A previously undescribed species of human leukocyte, or alpha, interferon is present in the serum of many patients with systemic lupus erythematosus. It was shown to be alpha-interferon by neutralization with specific antiserums, affinity column chromatography, and antiviral activity on bovine cells. However, 23 of 30 interferon samples tested were inactivated by incubation at pH 2, a characteristic of human "immune," or gamma, interferon. Multiple samples of interferon from the same patient had similar biological properties, but samples from different patients were not all identical, suggesting that several variants of this species of human alpha-interferon may exist.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Preble, O T -- Black, R J -- Friedman, R M -- Klippel, J H -- Vilcek, J -- R01-AI-07057/AI/NIAID NIH HHS/ -- R01-AI-12948/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1982 Apr 23;216(4544):429-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6176024" target="_blank"〉PubMed〈/a〉
    Keywords: Humans ; Hydrogen-Ion Concentration ; Interferons/*blood/immunology ; Lupus Erythematosus, Systemic/*blood
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  • 90
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    Modulation of spasticity: prolonged suppression of a spinal reflex by electrical stimulation (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-04-09
    Description: Electrical subcutaneous nerve stimulation of radial, median, and saphenous nerves has been shown to produce prolonged analgesia. In a double blind study, such stimulation also suppressed clonus for 3 hours after stimulation ceased in subjects with spasticity. Since the effect is contralateral, each subject was his own control. Because stimulation of the nerve in the wrist suppressed ankle clonus, the mechanism mediating the effect must be centrifugal inhibition. These results suggest that subcutaneous nerve stimulation may also be a tool in the management of spasticity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Walker, J B -- New York, N.Y. -- Science. 1982 Apr 9;216(4542):203-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7063882" target="_blank"〉PubMed〈/a〉
    Keywords: Electric Stimulation ; Functional Laterality ; Humans ; Motor Neurons/physiopathology ; Muscle Spasticity/physiopathology/*therapy ; Peripheral Nerves/physiopathology ; Reflex/physiology ; Spinal Cord/physiopathology
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  • 91
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    Temporal trends in the lead concentrations of umbilical cord blood (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-06-25
    Description: Umbilical cord blood specimens from 11,837 births between April 1979 and April 1981 have been analyzed for lead by anodic stripping voltammetry. The mean was 6.56 +/- 3.19 (standard deviation) micrograms per deciliter of blood, and the range was 0.0 to 37.0 micrograms per deciliter. The mean decreased annually by 0.77 +/- 0.03 microgram per deciliter, about 11 percent. Lead concentrations were higher in infants born in summer than in infants born in winter (7.17 versus 5.99, probability less than .001). A Fourier model of the data is presented, and possible reasons for the decline are discussed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rabinowitz, M B -- Needleman, H L -- New York, N.Y. -- Science. 1982 Jun 25;216(4553):1429-31.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089532" target="_blank"〉PubMed〈/a〉
    Keywords: Boston ; Environmental Exposure ; Fetal Blood/*analysis ; Humans ; Infant, Newborn ; Lead/*blood ; Longitudinal Studies ; Maximum Allowable Concentration ; Seasons
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  • 92
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    How do we avoid confounding the direction we are looking and the direction we are moving? (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-01-08
    Description: Contrary to a previous assumption, the center of the expanding pattern of visual flow is not generally useful as an aid in judging the direction of self motion since its direction depends on the direction of gaze. For some visual environments, however, the point of maximum rate of change of magnification in the retinal image coincides with the direction of self motion, independently of the direction of gaze. This visual indicator could be used to judge the direction of self motion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Regan, D -- Beverley, K I -- New York, N.Y. -- Science. 1982 Jan 8;215(4529):194-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7053572" target="_blank"〉PubMed〈/a〉
    Keywords: Humans ; Motion Perception/*physiology ; Orientation/physiology ; Retina/physiology ; Visual Perception/*physiology
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  • 93
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    Manipulation of event-related potential manifestations of information processing stages (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-11-26
    Description: The timing of two event-related potential components was differentially affected by two experimental variables. The earlier component (NA) was affected by degradation of the stimuli and the later component (N2) by the nature of a classification task. The results support the hypothesis that NA and N2 reflect sequential stages of information processing, namely, pattern recognition and stimulus classification.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ritter, W -- Simson, R -- Vaughan, H G Jr -- Macht, M -- HD 10804/HD/NICHD NIH HHS/ -- IF32 AGO-5193/AG/NIA NIH HHS/ -- MH 06723/MH/NIMH NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1982 Nov 26;218(4575):909-11.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7134983" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Adult ; Brain/*physiology ; Brain Mapping ; Cognition/*physiology ; Discrimination (Psychology)/physiology ; Evoked Potentials ; Humans ; Information Theory ; Perception/*physiology ; Time Factors
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  • 94
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    Human fetal movement: spontaneous oscillations near one cycle per minute (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-12-24
    Description: Spectral analysis of spontaneous fluctuations in human fetal movement revealed strong oscillations at frequencies between 0.24 and 0.90 cycle per minute, which are much higher than those of the cyclic alternation of quiet and active states in the fetus and neonate. Oscillations at frequencies up to 2.88 cycles per minute were also detected, but they were usually much weaker. The prominent peaks in the fetal movement spectra are in the frequency range of recently reported neonatal motor rhythms, and indicate the existence of a cyclic process controlling spontaneous motor output that oscillates near one cycle per minute and begins to function in utero.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Robertson, S S -- Dierker, L J -- Sorokin, Y -- Rosen, M G -- M01RR00210/RR/NCRR NIH HHS/ -- P50HD11089/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1982 Dec 24;218(4579):1327-30.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7146916" target="_blank"〉PubMed〈/a〉
    Keywords: Female ; Fetus/*physiology ; Humans ; *Movement ; Pregnancy ; Pregnancy Trimester, Third ; Spectrum Analysis/methods ; Time Factors
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  • 95
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    Tonotopic organization of the human auditory cortex (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-06-18
    Description: Neuromagnetic measurements of responses to auditory stimuli consisting of pure tones amplitude-modulated at a low frequency have been used to deduce the location of cortical activity. The evoked field source systematically increased in depth beneath the scalp with increasing frequency of the tone. The tonotopic progression can be described as a logarithmic mapping.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Romani, G L -- Williamson, S J -- Kaufman, L -- New York, N.Y. -- Science. 1982 Jun 18;216(4552):1339-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7079770" target="_blank"〉PubMed〈/a〉
    Keywords: Acoustic Stimulation ; Auditory Cortex/anatomy & histology/*physiology ; Evoked Potentials ; Evoked Potentials, Auditory ; Humans ; Magnetics
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  • 96
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    Endemic pleural disease associated with exposure to mixed fibrous dust in Turkey (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-04-30
    Description: Pleural mesothelioma, lung cancer, pleural calcification and fibrosis, and interstitial parenchymal fibrosis have been observed among inhabitants of several villages in south-central Turkey. Earlier reports have stated that environmental and lung tissue samples from this area contained the fibrous zeolite mineral erionite, and this mineral has generally been assumed to be the agent responsible for these endemic pathological conditions in the absence of asbestos outcroppings and usage. Several different kinds of asbestos minerals in addition to erionite have now been found in environmental samples taken from the villages where these diseases occur. The lung tissues of mesothelioma patients from these villages contain both fibrous zeolites and asbestos minerals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rohl, A N -- Langer, A M -- Moncure, G -- Selikoff, I J -- Fischbein, A -- New York, N.Y. -- Science. 1982 Apr 30;216(4545):518-20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7071597" target="_blank"〉PubMed〈/a〉
    Keywords: Dust ; Environmental Exposure ; Humans ; Lung Diseases/*chemically induced ; Lung Neoplasms/*chemically induced/epidemiology ; Mesothelioma/*chemically induced/epidemiology ; Turkey
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  • 97
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    Subperiosteal expansion and cortical remodeling of the human femur and tibia with aging (1982)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1982-09-03
    Description: Increases with aging in subperiosteal dimensions and second moments of area (measures of bending and torsional rigidity) in femoral and tibial cross sections are documented in an archeological sample from the American Southwest. Significant differences between cross-sectional sites and between sexes in the pattern of cortical remodeling with age are also present. These differences appear to be related to variations in the stress or strain levels in different regions of the femur and tibia which result from in vivo mechanical loadings of the lower limb.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ruff, C B -- Hayes, W C -- AM00749/AM/NIADDK NIH HHS/ -- AM26740/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1982 Sep 3;217(4563):945-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7112107" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; *Aging ; Bone Development ; Female ; Femur/*physiology ; Fractures, Bone/etiology ; Growth ; Humans ; Male ; Middle Aged ; Periosteum/*physiology ; Physical Exertion ; Sex Characteristics ; Stress, Mechanical ; Tibia/*physiology
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  • 98
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    Alzheimer's disease and senile dementia: loss of neurons in the basal forebrain (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-03-05
    Description: Recent evidence indicates that the nucleus basalis of Meynert, a distinct population of basal forebrain neurons, is a major source of cholinergic innervation of the cerebral cortex. Postmortem studies have previously demonstrated profound reduction in the presynaptic markers for cholinergic neurons in the cortex of patients with Alzheimer's disease and senile dementia of the Alzheimer's type. The results of this study show that neurons of the nucleus basalis of Meynert undergo a profound (greater than 75 percent) and selective degeneration in these patients and provide a pathological substrate of the cholinergic deficiency in their brains. Demonstration of selective degeneration of such neurons represents the first documentation of a loss of a transmitter-specific neuronal population in a major disorder of higher cortical function and, as such, points to a critical subcortical lesion in Alzheimer's patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Whitehouse, P J -- Price, D L -- Struble, R G -- Clark, A W -- Coyle, J T -- Delon, M R -- MH 00125/MH/NIMH NIH HHS/ -- MH 26654/MH/NIMH NIH HHS/ -- NS 10580/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1982 Mar 5;215(4537):1237-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7058341" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/physiology ; Alzheimer Disease/*pathology/physiopathology ; Basal Ganglia/*pathology ; Dementia/*pathology/physiopathology ; Humans ; Neural Pathways/pathology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 99
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    Cytoplasmic inclusion bodies in Escherichia coli producing biosynthetic human insulin proteins (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-02-05
    Description: Escherichia coli that has been genetically manipulated by recombinant DNA technology to synthesize human insulin polypeptides (A chain, B chain, or proinsulin) contains prominent cytoplasmic inclusion bodies. The amount of inclusion product within the cells corresponds to the quantity of chimeric protein formed by the bacteria. At peak production, the inclusion bodies may occupy as much as 20 percent of the Escherichia coli cellular volume.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Williams, D C -- Van Frank, R M -- Muth, W L -- Burnett, J P -- New York, N.Y. -- Science. 1982 Feb 5;215(4533):687-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7036343" target="_blank"〉PubMed〈/a〉
    Keywords: Cloning, Molecular/methods ; Cytoplasmic Granules/ultrastructure ; DNA, Recombinant ; Escherichia coli/metabolism/*ultrastructure ; Humans ; Insulin/*genetics ; Microscopy, Electron ; Plasmids
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 100
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    Type A behavior and elevated physiological and neuroendocrine responses to cognitive tasks (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-10-29
    Description: Qualitatively distinct patterns of cardiovascular and neuroendocrine responses were observed in male college students during mental work and during sensory intake task performance. During mental work, Type A (coronary-prone) subjects showed greater muscle vasodilatation and more enhanced secretion of norepinephrine, epinephrine, and cortisol than Type B subjects. During sensory intake, Type A hyperresponsivity was found for testosterone and, among those subjects with a positive family history of hypertension, for cortisol. As a demonstration of combined cardiovascular, sympathetic nervous system, and neuroendocrine hyperresponsivity to specific cognitive tasks in Type A subjects, this study breaks ground in the search for mechanisms mediating the increased coronary disease risk among Type A persons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Williams, R B Jr -- Lane, J D -- Kuhn, C M -- Melosh, W -- White, A D -- Schanberg, S M -- HL-22740/HL/NHLBI NIH HHS/ -- MH-6489/MH/NIMH NIH HHS/ -- MH-70482/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1982 Oct 29;218(4571):483-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7123248" target="_blank"〉PubMed〈/a〉
    Keywords: Behavior/*physiology ; Blood Pressure ; Cardiovascular Diseases/etiology ; Cognition/*physiology ; Hemodynamics ; Hormones/blood ; Humans ; Hydrocortisone/blood ; Risk
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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