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  • 1
    Series available for loan
    Series available for loan
    Scientific cruise reports of Arctic expeditions ARK IV/1, 2 & 3 (1989)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Details Availability
    Call number: ZSP-168-56
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 149 S. : Ill., graph. Darst., Kt.
    ISSN: 0176-5027
    Series Statement: Berichte zur Polarforschung 56
    URL: http://hdl.handle.net/10013/epic.10056
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Series available for loan
    Series available for loan
    Scientific cruise reports of Arctic expeditions ARK VI/1-4 of RV "Polarstern" in 1989 (1991)
    Bremerhaven : Alfred-Wegener Inst. für Polar- und Meeresforschung
    Associated volumes
    Details Availability
    Call number: ZSP-168-87
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 110 S. : graph. Darst., Kt.
    ISSN: 0176-5027
    Series Statement: Berichte zur Polarforschung 87
    URL: http://hdl.handle.net/10013/epic.10087
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Potential Role of Growth Factors in Global Brain Ischemia and Reperfusion: Observation of Insulin-Driven Tyrosine Phosphorylation of a 90-kDa Protein during Reperfusion (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 692 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb26234.x
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  • 4
    Electronic Resource
    Electronic Resource
    Nutrient Retention of Portioned Menu Items after Infrared and Convective Heat Processing (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 48 (1983), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Portion-controlled menu items were heat processed in infrared and convection ovens to compare the effects of the heating methods upon nutrient retention. Product yields for hamburger and potatoes were significantly greater (P 〈 0.05) after convective heating; for tomatoes, after infrared heating. Nutrients analyzed foi selected menu items included: thiamin, riboflavin, vitamin C, β-carotene, seven fatty acids, 18 amino acids, ammonia, phosphorus, iron and sodium. Several significant differences between the heat processed samples were revealed. The riboflavin and vitamin A contents in hamburger and tomatoes, respectively, were significantly greater after infrared heating. The total amino acid contents were significantly greater after infrared heating for the hamburger patties and cod fillets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1983.tb14919.x
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal Conductivity of White Bread During Convective Heat Processing (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 47 (1982), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Thermal conductivity values of white bread were determined during heat processing to provide information for analytical modeling required during convective heat and mass transfer of the baking process. Selected physical properties of bread were determined: moisture, volume, bulk density and porosity. White bread was baked in a forced-air convection oven for 8, 16, 24 and 32 min. Thermal conductivity values ranged from 0.00072–0.00064 watts/cm-°C. Although a downward trend was observed and explained, no significant differences were revealed among thermal conductivity values. Thermal conductivity values were indirectly linearly dependent (p〉0.05) on volume and porosity; directly, to bulk density and moisture loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb11071.x
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  • 6
    Electronic Resource
    Electronic Resource
    Chlorophyll Fluorescence and Photosynthesis: The Basics (1991)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology and Plant Molecular Biology 42 (1991), S. 313-349 
    Details
    ISSN: 1040-2519
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pp.42.060191.001525
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  • 7
    Electronic Resource
    Electronic Resource
    Responses of photosystem I compared with photosystem II to high-light stress in tropical shade and sun leaves (2001)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 24 (2001), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Sun and shade leaves of several plant species from a neotropical forest were exposed to excessive light to evaluate the responses of photosystem I in comparison to those of photosystem II. Potential photosystem I activity was determined by means of the maximum P700 absorbance change around 810 nm (ΔA810max) in saturating far-red light. Leaf absorbance changes in dependence of increasing far-red light fluence rates were used to calculate a ‘saturation constant’, Ks, representing the far-red irradiance at which half of the maximal absorbance change (ΔA810max/2) was reached in the steady state. Photosystem II efficiency was assessed by measuring the ratio of variable to maximum chlorophyll fluorescence, Fv/Fm, in dark-adapted leaf samples. Strong illumination caused a high degree of photo-inhibition of photosystem II in all leaves, particularly in shade leaves. Exposure to 1800–2000 μmol photons m−2 s−1 for 75 min did not substantially affect the potential activity of photosystem I in all species tested, but caused a more than 40-fold increase of Ks in shade leaves, and a three-fold increase of Ks in sun leaves. The increase in Ks was reversible during recovery under low light, and the recovery process was much faster in sun than in shade leaves. The novel effect of high-light stress on the light saturation of P700 oxidation described here may represent a complex reversible mechanism within photosystem I that regulates light-energy dissipation and thus protects photosystem I from photo-oxidative damage. Moreover, we show that under high-light stress a high proportion of P700 accumulates in the oxidized state, P700+. Presumably, conversion of excitation energy to heat by this cation radical may efficiently contribute to photoprotection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.2001.00673.x
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  • 8
    Electronic Resource
    Electronic Resource
    Acclimation of tropical tree seedlings to excessive light in simulated tree-fall gaps (2001)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 24 (2001), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Acclimation to periodic high-light stress was studied in tree seedlings from a neotropical forest. Seedlings of several pioneer and late-succession species were cultivated under simulated tree-fall gap conditions; they were placed under frames covered with shade cloth with apertures of different widths that permitted defined periods of daily leaf exposure to direct sunlight. During direct sun exposure, all plants exhibited a marked reversible decline in potential photosystem II (PSII) efficiency, determined by means of the ratio of variable to maximum Chl a fluorescence (Fv/Fm). The decline in Fv/Fm under full sunlight was much stronger in late-succession than in pioneer species. For each gap size, all species exhibited a similar degree of de-epoxidation of violaxanthin in direct sunlight and similar pool sizes of xanthophyll cycle pigments. Pool sizes increased with increasing gap size. Pioneer plants possessed high levels of β-carotene that also increased with gap size, whereas α-carotene decreased. In contrast to late-succession plants, pioneer plants were capable of adjusting their Chl a/b ratio to a high value in wide gaps. The content of extractable UV-B-absorbing compounds was highest in the plants acclimated to large gaps and did not depend on the successional status of the plants. The results demonstrate a better performance of pioneer species under high-light conditions as compared with late-succession plants, manifested by reduced photoinhibition of PSII in pioneer species. This was not related to increased pool size and turnover of xanthophyll cycle pigments, nor to higher contents of UV-B-absorbing substances. High β-carotene levels and increased Chl a/b ratios, i.e. reduced size of the Chl a and b binding antennae, may contribute to photoprotection in pioneer species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0016-8025.2001.00786.x
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  • 9
    Electronic Resource
    Electronic Resource
    Relationship between photoinhibition of photosynthesis, D1 protein turnover and chloroplast structure: effects of protein synthesis inhibitors (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 17 (1994), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Irradiation of Spinach oleracea intact leaf tissue and of mesophyll protoplasts of Valerianella locusta at 20° C with strong light resulted in severe (40–80%) inhibition of photosynthesis, measured as photosystem II electron transport activity in isolated thylakoids or as fluorescence parameter FV/FM on intact leaf disks. No net degradation of the D1 protein of photosystem II was seen under these conditions. However, in the presence of streptomycin, an inhibitor of chloroplast protein synthesis, net D1 degradation (up to about 80%) did occur with a half-time of 4–6h, and photoinhibition was enhanced. Thylakoid ultrastructure remained stable during photoinhibition, even when substantial degradation of D1 took place in the presence of streptomycin. When leaf disks were irradiated at 2°C, streptomycin did not influence the degree of photoinhibition, and net Dl degradation did not occur. These results suggest that in excess (photoinhibitory) light at 20°C, turnover (coordinated degradation and synthesis) of D1 diminished the degree of photoinhibition. The observed photoinhibition is thought to be due to the accumulation of inactive photosystem II reaction centres still containing D1. In the presence of streptomycin, the Dl protein was degraded (probably in the previously inactivated centres), but restoration of active centres via D1 synthesis was blocked, leading to more severe photoinhibition. Low temperature (2°C), by restricting both degradation and resynthesis of D1, favoured the accumulation of inactive centres. Streptomycin and chloramphenicol (another inhibitor of chloroplast protein synthesis) were tested for side-effects on photosynthesis. Strong inhibitory effects of chloramphenicol, but much less severe effects of streptomycin were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1994.tb00265.x
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  • 10
    Electronic Resource
    Electronic Resource
    Assignment of the ^1^5N NMR spectra of reduced and oxidized Escherichia coli thioredoxin
    Amsterdam : Elsevier
    FEBS Letters 284 (1991), S. 178-183 
    Details
    ISSN: 0014-5793
    Keywords: Heteronuclear NMR ; Protein conformation ; Redox protein ; Thioredoxin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(91)80679-W
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