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  • 1975-1979  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of novel bis(amides) by means of triphenyl phosphite intermediates (1978)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 23 (1978), S. 349-350 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60079a006
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Coral calcification: Sources of error in radioisotope techniques (1977)
    Springer
    Marine biology 42 (1977), S. 119-129 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Isotopic exchange occurs between coral skeleton and 45Ca++ and H14CO 3 - in seawater. Exchange of 14C onto skeletons is more rapid than exchange of 45Ca++. Exchange of 14C from skeletons to seawater takes place more slowly than exchange of 45Ca++ to seawater. When living coral is incubated in the dark with radioisotopes for 1 h, the tissues contain considerably more radioactivity than is associated with the skeleton. The tissue radioactivity reflects permeation of tissues and coelenteron by radioactive compounds from the incubation seawater. Addition of alkalis to cardioactive seawater results in a radioactive precipitate, part of which becomes associated with any coral skeleton present, and part of which forms on the wall of the containing vessel. Strong alkali removes biologically-deposited radioisotope from coral skeletons. Deposition, of 14C from H14CO 3 - in skeletons of living coral incubated in the dark is greater than in dead coral. The reverse situation occurs with 45Ca++.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391562
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gas-exchange studies with the staghorn coral Acropora acuminata and its zooxanthellae (1977)
    Springer
    Marine biology 40 (1977), S. 185-194 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Compensation point and light-saturation values were determined from oxygen-exchange experiments with branches and isolated zooxanthellae from the staghorn coral Acropora acuminata. Branches and dense suspensions of zooxanthellae showed similar lightresponse curves for oxygen exchange, with light saturation at about 23 Klux (300 W. m-2) and compensation point occurring between 4 and 6 Klux (60–80 W. m-2). Zooxanthellae appear to be mutually shaded in dense suspensions and coral tissues. The effects of metabolic inhibitors, including photosynthetic and respiratory inhibitiors, on oxygen exchange in coral branches and isolated zooxanthellae are presented. Bubbles formed on coral tissues and on several macroalgae under conditions of high illumination contained large amounts of oxygen, suggesting that a high oxygen tension may occur in coral tissues during the day. Photorespiration and dissolved organic carbon production by suspensions of zooxanthellae are discussed in relation to a high oxygen tension which probably occurs in coral tissues during daylight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396265
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Calcification in the staghorn coral Acropora acuminata: Variations in apparent skeletal incorporation of radioisotopes due to different methods of processing (1977)
    Springer
    Marine biology 43 (1977), S. 57-62 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Pieces of branch from the staghorn coral Acropora acuminata were incubated with 45CaCl2 and NaH14CO3 under identical conditions in the light or in the dark. Specimens were then processed in different ways. All specimens were placed in N KOH to digest tissues. Some were placed in KOH immediately after incubation; others were placed in KOH after 2 h washing, or after 2 h extraction with methanol-chloroformwater. Specimens were washed in running fresh water or running seawater; some were killed in liquid N2 before washing. Radioactivity associated with skeleton and tissues was determined. The method of processing profoundly affected the results. In dark incubations, there was up to a four-fold difference in apparent skeletal incorporation of 45Ca++ between average values obtained for the different treatments. For 14C incorporation, there was a difference of up to 2.5 times. In light incubations, skeletal incorporation of both radioisotopes showed a two-fold difference between high and low average values obtained for the different treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392571
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Extension rate: A primary control on the isotopic composition of West Indian (Jamaican) scleractinian reef coral skeletons (1975)
    Springer
    Marine biology 33 (1975), S. 221-233 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Large variations in skeletal microarchitecture, and in the carbon and oxygen isotopic composition of the skeleton, exist within single calices and over the surfaces of single colonies of various species of West Indian (Jamaican) scleractinian reef corals. Rapidly extending parts of individual colonies are depleted in both C13 and O18 regardless of the abundance of zooxanthellae in the overlying tissues. We suggest that this relationship is due to active translocation of organic compounds to sites of rapid calcification. Considerable variation in isotopic composition is found in skeletons of different specimens of the same species even when the skeletons are sampled in a consistent manner, come from the same locality and depth, and have a comparable growth history. The isotopic composition of the scleractinian skeleton is vastly more complex than has heretofore been realized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390926
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    Paper (German National Licenses)
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