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  • 1
    Monograph available for loan
    Monograph available for loan
    B.A.S. Archives : guide to holdings (1987)
    Cambridge : British Antarctic Survey
    Details Availability
    Call number: AWI E3-89-0106
    Type of Medium: Monograph available for loan
    Pages: 156 Seiten , 29 cm
    Edition: First edition: June 1987
    ISBN: 0856651230
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of camphor on mitochondrial respiration (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 236-237 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Camphor at 〈8 μmoles/mg protein reduced the rate of oxygen consumption by rat liver mitochondria. The effect occurs only with NAD+-linked substrates. Succinate linked respiration was inhibited but this appears to be caused by some conversion of succinate to malate. At higher levels, camphor increases oxygen consumption with succinate substrate, by uncoupling at site II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01945085
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  • 3
    Electronic Resource
    Electronic Resource
    A “CO2 supply” mechanism in zooxanthellate cnidarians: role of carbonic anhydrase (1989)
    Springer
    Marine biology 100 (1989), S. 195-202 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carbonic anhydrase (CA, EC 4.2.1.1) activity was detected in 22 species of tropical cnidarians which contain endosymbiotic dinoflagellates (=zooxanthellae). CA activity was 2 to 3 times higher in animal tissue than in algae and ca. 29 times higher in zooxanthellate than azooxanthellate species. It was also higher in the zooxanthellate tentacle tissue than in the azooxanthellate column tissue of the anemone Condylactis gigantea. CA was therefore significantly related to the presence of endosymbiotic algae. Further results indicated that CA functions in the photosynthetic carbon metabolism of zooxanthellate cnidarians as evidenced by (1) low CA activity in shade-adapted and deep water colonies compared to the more productive shallow water, light-adapted colonies of the coral Stylophora pistillata, and (2) the 56 to 85% reduction in photosynthetic carbon assimilation by zooxanthellae in situ in the presence of Diamox, an inhibitor of CA. Although CA has been proposed to function in calcification, its association with zooxanthellae and photosynthetic activity in both calcifying and non-calcifying associations suggests a role in photosynthetic metabolism of algal/cnidarian symbioses. It is proposed that CA acts as a “CO2 supply” mechanism by releasing CO2 from bicarbonate, and enabling zooxanthellae to maintain high rates of photosynthesis in their intracellular environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391958
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of particulate peat on the behavior and physiology of the Jamaican reef-building coral Montastrea annularis (1982)
    Springer
    Marine biology 68 (1982), S. 229-233 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Corals in an in situ respirometer exposed to suspended peat during the day greatly decreased net oxygen production, probably due to a reduction of intensity and spectral quality of light reaching the symbiotic zooxanthellae. Net production returned to pre-exposure levels after the chambers were cleared; the corals showed no behavioral effects. In contrast, after exposure during the night, corals displayed clearing behavior (such as extreme distension of the coenosarc and trapping of peat particles in thick clumps of mucus) and an increase in respiration rate comparable to the decrease in net production observed during the daytime exposure. The following morning, net production values were significantly lower than pre-exposure production values although ambient light intensity was slightly higher. This decrease in production as well as a 22% reduction of chlorophyll content in the coral tissue indicated loss of zooxanthellae from the stressed corals. Long-term exposure to such a stress could reduce coral growth rates and substantially alter coral reef communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409589
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  • 5
    Electronic Resource
    Electronic Resource
    Ontogenetic influences on carbon flux in Aulactinia stelloides polyps (Anthozoa: Actiniaria) and their endosymbiotic algae (1986)
    Springer
    Marine biology 92 (1986), S. 361-369 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Adult speciments of the tropical sea anemone Aulactinia stelloides Verrill (McMurrich, 1889) were collected from Andros Island, Bahamas, during October 1983, and the influence of animal developmental stage on the growth and photosynthetic capacity of endosymbiotic algae, as well as the utilization of translocated carbon by the animal, was investigated in adult and juvenile polyps using short-term 14C-bicarbonate labelling experiments. Zooxanthellae cell size was equivalent in adult (A) and juvenile (J) polyps. Light-saturated photosynthetic rates of zooxanthellae in juvenile polyps were double those in adult polyps (J: 5.7±0.2 μg C 106 cells-1 h-1 vs A: 2.4±0.8 μg C 106 cells-1 h-1), as were their cell-division frequencies (J: 4.4±0.5% vs A: 2.2±0.4%). Estimates of the percent of photosynthetically fixed 14C translocated to the anemone tissue by the zooxanthellae during 1 h incubations were lower for juvenile polyps (21%) than for adult polyps (29%). Zooxanthellae carbon-specific, translocation rates were, however, positively correlated with their specific photosynthetic rates. Partitioning of translocated carbon between the methanol-water-soluble, chloroform-soluble, and insoluble fractions of the host tissues exhibited significant variation with the developmental stage of the anemone. A significantly higher proportion of the fixed 14C activity in the animal tissues of adult polyps was recovered from the lipid (33%) compared to the particulate phase (18%). In juvenile polyps, the lipid and particulate fractions had equal proportions (25%) of the animal-tissue 14C activity. This study indicates that host developmental stage can influence zooxanthellae growth rates and consequently the rate of carbon flow within the association. The utilization of translocated carbon by the animal tissue is dependent on the biosynthetic requirements of its developmental stage in addition to its nutritional status.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392677
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  • 6
    Electronic Resource
    Electronic Resource
    Light regulation of nitrate reductase in Ulya fenestrata (Chlorophyceae) (1992)
    Springer
    Marine biology 112 (1992), S. 691-696 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Observations were made on the behavior of nitrate reductase activity in the green alga Ulva fenestrata under controlled light:dark regimes. The activity of nitrate reductase (NR) was examined in response to normal seasonal photoperiods as well as in response to shortened or extended periods of darkness. NR activity exhibits a light-dependent diurnal rhythm under both normal summer and winter photoperiods, with a maximum in the early morning (2 to 2.5 h after the start of illumination). This peak of activity is followed by a lower steady-state level of activity which is sustained throughout the light period. There is a sustained minimal level of activity in darkness. The morning peak in activity is always observed as long as tissue is illuminated, irrespective of the previous light or dark treatments. As such, it appears that nitrate reductase activity in U. fenestrata is under circadian control. There is no major difference in the NR activity pattern between summer and winter plants, except that the peak activity values in winter plants are consistently much higher (5 times) than in summer plants. The study also suggests that illumination prior to the normal start of photoperiod triggers a different set of regulatory mechanisms, indicating that the physiological state of plants is important in dictating the NR activity response to illumination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346188
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  • 7
    Electronic Resource
    Electronic Resource
    Cell cycle of symbiotic dinoflagellates: variation in G1 phase-duration with anemone nutritional status and macronutrient supply in the Aiptasia pulchella–Symbiodinium pulchrorum symbiosis (1999)
    Springer
    Marine biology 134 (1999), S. 405-418 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The metabolite exchange in alga–invertebrate symbioses has been the subject of extensive research. A central question is how the biomass of the algal endosymbionts is maintained within defined limits under a given set of environmental conditions despite their tremendous growth potential. Whether algal growth is actively regulated by the animal cells is still an open question. We experimentally evaluated the effect of inorganic nutrient supply and host-animal nutritional status on the biomass composition, growth and cell-cycle kinetics of the endosymbiotic dinoflagellate Symbiodinium pulchrorum (Trench) in the sea anemone Aiptasia pulchella. Dinoflagellates in anemones starved for 14 d exhibited lower growth rates, chlorophyll content and higher C:N ratios than in anemones fed Artemia sp. (San Francisco brand #65034) nauplii every 2 d, indicating N-limitation of the algae during starvation of the host animal. Manipulation of the dissolved inorganic nutrient supply through ammonium and phosphate additions induced a rapid recovery (half time, t ½∼ 2 d) in the C:N ratio of the dinoflagellate cells to levels characteristic of N-sufficient cells. The mitotic index and population growth rate of the dinoflagellate symbionts subjected to this enrichment did not recover to the levels exhibited in fed associations. Flow cytometric analysis of dinoflagellate cell size and DNA content revealed that the duration of the G1 phase (first peak of DNA content: 70 to 100 relative fluorescence units, rfu) of their cell cycle lengthened dramatically in the symbiotic state, and that the majority of algal biomass increase occurred during this phase. Covariate analysis of dinoflagellate cell size and DNA-content distributions indicated that the symbiotic state is associated with a nutrient-independent constraint on cell progression from G1 through the S phase (intermediate DNA content: 101 to 139 rfu). This analysis suggests that the host-cell environment may set the upper limit on the rate of dinoflagellate cell-cycle progression and thereby coordinate the relative growth rates of the autotrophic and heterotrophic partners in this symbiotic association.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050557
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  • 8
    Electronic Resource
    Electronic Resource
    High-resolution position-sensitive detector (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1954-1956 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper describes a position-sensitive detector for particles or photons which has a spatial resolution of about 15 μm. The active area is about 1.3 mm in diameter. This represents an improvement of conventional position-sensitive detection capability by about one order of magnitude and should be useful in spectrometry, spectroscopy, and atomic collision experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140058
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  • 9
    Electronic Resource
    Electronic Resource
    Genesis of a highly pathogenic and potentially pandemic H5N1 influenza virus in eastern Asia (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 430 (2004), S. 209-213 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A highly pathogenic avian influenza virus, H5N1, caused disease outbreaks in poultry in China and seven other east Asian countries between late 2003 and early 2004; the same virus was fatal to humans in Thailand and Vietnam. Here we demonstrate a series of genetic reassortment events traceable ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02746
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  • 10
    Electronic Resource
    Electronic Resource
    5.2. Control of pea Moth in Kent, 192–64 (1965)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 14 (1965), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1965.tb00955.x
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