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  • Springer  (7)
  • American Institute of Physics (AIP)
  • 2010-2014
  • 2000-2004
  • 1975-1979  (7)
  • 1979  (7)
Collection
Keywords
Publisher
  • Springer  (7)
  • American Institute of Physics (AIP)
Years
  • 2010-2014
  • 2000-2004
  • 1975-1979  (7)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Increasing mutagenic efficiency of gamma-radiation in rice by irradiation of seeds at extremely low temperature (1979)
    Springer
    Euphytica 28 (1979), S. 697-704 
    Details
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rice ; gamma-radiation ; temperature ; mutation frequency ; heading date
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Dry seeds of rice, Oryza sativa L., containing about 13 percent moisture, were exposed to 60Co gamma raysat extremely low temperature (−196°C). M1 damage on survival rate, seedling height and seed set were found to become much smaller in the cooling treatment than in the not-cooled control. Chlorophyll and heading date mutation frequencies in the M2 generation were not affected by the decreased M1 damage caused by the cooling treatment, and the mutation frequencies could be significantly increased by applying higher doses combined with the cooling treatment. Frequency of sterile or semi-sterile mutants in the M2 generation was found to be significantly lower in the cooling treatment than in the not-cooled control. It is assumed from the experimental results that extremely low temperatures during irradiation could reduce the amount of physiological damage and gross chromosome aberrations. This results in an increased efficiency of producing minute deletions and/or point mutations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038936
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  • 2
    Electronic Resource
    Electronic Resource
    The seasonal cycle of the phytoplankton in the coastal waters of Ghana (1979)
    Springer
    Hydrobiologia 62 (1979), S. 33-45 
    Details
    ISSN: 1573-5117
    Keywords: Seasonal cycle ; temperature ; salinity ; phosphate nitrate ; silicate ; phytoplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal changes in the phytoplankton at four depths off Tema, Ghana were investigated between September 1973 and November 1974. The physico-chemical factors show that there are two marine seasons, the season of major upwelling (July–October), characterized by low water temperatures (〈 25°C), high salinity (〉 35‰) and high nutrient levels, and a non-upwelling period (November–June) when water temperatures are higher and salinity and nutrients are lower. The latter marine season is broken by a small, unpredictable upwelling (December-January). Phytoplankton cell counts are high (〉 1000 × 103 cells/1) during the major upwelling period and can be very low (〈 2 × 103 cells/1) during the non-upwelling period. Dinoflagellates form the main components of the phytoplankton population during the nonupwelling period and diatoms form the dominant components at other times. There is a close relationship between the physicochemical factors and the phytoplankton population especially during the major upwelling period. For example there is a good correspondence between the peaks in phytoplankton numbers and low levels of nutrients such as silicate, nitrate and phosphate with the reverse taking place at other times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012560
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of food availability and other factors on the composition, structure and density on a subarctic population of benthic invertebrates (1979)
    Springer
    Hydrobiologia 62 (1979), S. 215-223 
    Details
    ISSN: 1573-5117
    Keywords: Algae ; density ; depth ; feeding ; molluscs ; oligochaetes ; subarctic ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The factors influencing the composition, structure and density of benthic invertebrate communities in Yellowknife Bay in the Canadian subarctic were determined between June 1975 and April 1977. Attached algae, primarily Fragilaria vaucheriae, Fragilaria pinnata, Cymbella ventricosa and Cocconeis placentula were ingested in large numbers by several dominant species including the oligochaetes Rhyacodrilus sodalis, Lumbriculus variegatus and Limnodrilus claparendeianus and the mollusc Valvata sincera helicoidea. Although up to 7 × 105 cells/oligochaeta, representing 65% by volume of the gut contents, were recorded for littoral zone populations, specimens in the profundal zone contained 〈 7.5 × 104 cells in their guts. V. sincera helicoidea also ingested large numbers of attached algae (up to 2.3 × 104 cells/animal), these representing 15–18% by volume of the gut contents. Consequently, multiple regression analysis indicated that the availability of attached algae was the major factor influencing the benthic communities. While 31–64% of the population variability could be accounted for by this factor, other parameters such as phytoplankton availability, water depth, temperature, dissolved oxygen levels, total amount of food in the gut, and the organic content of the sediments had little if any direct effect on the benthic populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043538
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  • 4
    Electronic Resource
    Electronic Resource
    Laboratory studies of factors affecting egg hatch of triops longicaudatus (LeConte) (Notostraca : Triopsidae) (1979)
    Springer
    Hydrobiologia 63 (1979), S. 145-152 
    Details
    ISSN: 1573-5117
    Keywords: Triops longicaudatus ; Notostraca ; California ; rice field ; egg hatch ; desiccation ; pH ; temperature ; salinity ; soil corer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Egg hatch was greatest (78.33%) for eggs not previously desiccated. A reduction in numbers hatched occurred as the relative humidity at which they were dried decreased. Some eggs hatched (0.67–79.33%) at pH levels of 3.10–10.01 with the highest hatch at pH 5.60. Water temperature greatly affected egg hatch. No hatch occurred until temperatures were above 14°C. A constant 29°C significantly inhibited hatching. Egg hatch increased 13.00 to 43.42% as salinity decreased from 2200 to 9.24 micromhos/cm. As little as 13 mm of flooded soil covering the eggs prevented them from hatching for 14 days. Eighteen percent hatch resulted when soil and eggs were redistributed to a 1 mm soil layer. Egg samples from the same parent, even though treated similarly, often hatched at greatly varying rates and only rarely was hatching 100% within a replication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00030077
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  • 5
    Electronic Resource
    Electronic Resource
    The year cycle of Eudiaptomus vulgaris (Schmeil, 1896) (Copepoda, Calanoida) in a small, acid water body during 1973. Development in the natural habitat and relationships between temperature and duration of development stages (1979)
    Springer
    Hydrobiologia 64 (1979), S. 17-36 
    Details
    ISSN: 1573-5117
    Keywords: Eudiaptomus ; year cycle ; sex ratio ; eggs ; spermatophores ; temperature ; development time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The development of a population of Eudiaptomus vulgaris (Schmeil, 1896) in the Meeuwenven, a shallow acid guanotrofic moorland pool, has been described during one year. The population hibernates as copepodite 5 stages, adults and, to a small extent as naupliar stages N1, N2 and N3 (which could not develop further at low temperatures in autumn). In spring the population development starts at temperatures above 10°C and shows 3 or 4 pulses a year. An attempt has been made to explain seasonal changes in the size of adult males and females and in the sex ratio. In order to establish the duration of the various development stages, the animals have been cultured at different temperatures under illumination with 2000 Lux at a daylength of 14 hours. An adequate quantity of food from the natural habitat was available. Total egg development and total naupliar and copepodite development have been compared with the results of other workers, especially with those from Eckstein (1964), who studied Eudiaptomus vulgaris in the deep Schluchsee. The duration curves do not differ markedly with those of Eckstein and are strongly temperature dependent. The relation between the development times of the various stages with temperature can be generally expressed as parabolic regressions of the type D = a + b1T + b2T2, the C5 and adult stages being the only exception at higher temperatures. Comparison of the relative duration of the stages at different temperatures did show that younger stages can take a larger share of the total development time at lower temperatures, stage N6 being the most temperature-sensitive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015450
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamics of phytoplankton growth in the Waikato River, North Island, New Zealand (1979)
    Springer
    Hydrobiologia 66 (1979), S. 237-244 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton ; dynamics of growth ; nutrient enrichment experiments ; temperature ; light ; Anabaena oscillarioides ; Microcystis aeruginosa ; Chlorella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Waikato River (latitude 38°S, longitude 176°E, North Island, New Zealand) is overwhelming y dominated by diatoms (mainly Melosira species) while blue-green and green algae are of minor importance. Both laboratory and in situ nutrient enrichment experiments showed enhanced growth of natural and index blue-green and green algae by addition of phosphate and nitrate. These algae were also shown to require higher temperature and light intensity than the diatoms. On the other hand, Waikato River with its higher silica content, moderate range of temperature and running water habitat was more favourable an environment for diatoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020905
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of temperature on contractility of the frog myocardium (1979)
    Springer
    Bulletin of experimental biology and medicine 88 (1979), S. 1245-1247 
    Details
    ISSN: 1573-8221
    Keywords: Isolated myocardium ; contractility ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Changes in the parameters of mechanical activity of the isolated frog myocardium during a change of temperature were studied. Between 0 and 35° lowering the temperature led to an increase in the force of contractions, but the velocity of contractions reached its optimum at 20°C. The velocity of contractions is a more appropriate and sensitive criterion for the study of the effect of cold on contractility than the force of contractions. It is concluded from analysis of the results that contractility of the myocardium is depressed during cooling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835561
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