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  • 1
    Electronic Resource
    Electronic Resource
    The effects of external NaCl on thylakoid stacking in lettuce plants (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 16 (1993), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The average degree of thylakoid stacking was determined for loose-leaf lettuce plants which were grown in complete nutrient solutions containing either 10 or 100mol m−3 NaCl. Digitonin fractionation and differential centrifugation were used to assay the level of thylakoid stacking. Based on a comparison between 10mol m−3 NaCl-grown and 100mol m−3 NaCl-grown lettuce plants of equal ages, digitonin assays indicated that significantly less stacking occurred in 100mol m−3 NaCl-grown plants. Isolated thylakoid membranes from 100mol m−3 NaCl-grown plants were also characterized by a greater capacity to absorb divalent cations and by a higher chlorophyll a/b ratio. Since plants from both growth salinities were capable of a marked increase in thylakoid stacking upon a transition from high to low irradiance, the observed differences in thylakoid stacking were not attributed to a salinity-related impairment of stacking mechanisms. Instead, the salinity-induced differences in thylakoid stacking appear to represent a process of controlled adjustment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1993.tb00863.x
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  • 2
    Electronic Resource
    Electronic Resource
    The crystal and molecular structure of heptachloro-5H-1-pyridine (1974)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 2762-2763 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740874008028
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  • 3
    Electronic Resource
    Electronic Resource
    2,4,5-Trichloro(methylthio)isophthalonitrile (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 3430-3434 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740872008064
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  • 4
    Electronic Resource
    Electronic Resource
    4-Chloro-5-methylamino-2,3,6-pyridinetrione monohydrate (1973)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 1971-1974 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740873005868
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of a CO2-enriched atmosphere on the growth and competitive interaction of a C3 and a C4 grass (1983)
    Springer
    Oecologia 58 (1983), S. 188-193 
    Details
    ISSN: 1432-1939
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Festuca elatior L., C3, and Sorghum halepense (L.) Persoon, C4, were grown in mixed and unmixed cultures under 350 and 600 ppm CO2 for 112 days. High CO2 levels stimulated increases of total dry weight and leaf surface area in Festuca despite unfavorably high temperatures. In Sorghum, delay of leaf senescence and of floral initiation was attributed to high CO2 concentrations. Growth of unmixed cultures of Sorghum under 600 ppm CO2 was relatively poor because of an apparent interaction of high CO2 with self-shading. All instances of culturexCO2 interactions are offered in supported of the hypothesis that elevated CO2 levels will effect the competitive interaction of C3 and C4 species. Peak net assimilation rates of C3 and C4 plants were seasonally separated at 350 ppm CO2 but coincided at 600 ppm. Based on our observations of Festuca and Sorghum, we project that global CO2 enrichment may alter competitive balance between C3 and C4 plants and subsequently affect seasonal niche separation, species distribution patterns, and net primary production within mixed communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399215
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  • 6
    Electronic Resource
    Electronic Resource
    The analysis of photosynthetic performance in leaves under field conditions: A case study using Bruguiera mangroves (1991)
    Springer
    Photosynthesis research 29 (1991), S. 11-22 
    Details
    ISSN: 1573-5079
    Keywords: convexity ; gas exchange ; photosynthetic capacity ; photosynthetic control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In this report, we analyze the photosynthetic capacity and performance of leaves under field conditions with a case study based on the mangroves Bruguiera parviflora and B. gymnorrhiza. Using a tower through a closed canopy at a field sight in North Queensland and portable infra-red gas analyzers, a large data set was collected over a period of 11 days early in the growing season. The set was used to analyze the relationship between net photosynthesis (Pnet) and light, leaf temperature, stomatal conductance and intracellular CO2 (Ci). There are three objectives of this report: (1) to determine photosynthetic potential as indicated by the in situ responses of Pnet to light and stomatal conductance, (2) to determine the extent to which photosynthetic performance may be reduced from that potential, and (3) to explore the basis for and physiological significance of the reduction. The results indicate that even under harsh tropical conditions, the mangrove photosynthetic machinery is capable of operating efficiently at low light and with maximal rates of more than 15 μmol CO2 m-2 s-1. Though stomata were more often limiting than light, in any single measurement the average reduction of Pnet from the maximum value predicted by light or conductance responses was 35%. Analysis of single leaf light and CO2 responses indicated that photosynthetic performance was under direct photosynthetic, or non-stomatal, control at all light and conductance levels. Capacity was adjustable rapidly from a maximum value to essentially nil such that Ci varied inversely with Pnet from ca. 150 μL L-1 at the highest rates of CO2 exchange to ambient at the lowest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035202
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  • 7
    Electronic Resource
    Electronic Resource
    A comparison of the physical properties of radiation and sulfur-cured poly(butadiene-co-styrene) (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 3193-3209 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The physical properties of radiation- and sulfur-cured poly(butadiene-co-styrene)-based stocks were compared. It was found that the measured lower ultimate strength of radiation-cured stocks is in part attributable to the difference in the glass transition temperatures of the stocks cured by the two methods (an increase in Tg is caused by sulfur curing). Another factor contributing to the difference in performance is the apparent nonuniform crosslink density distribution in radiationcured stocks containing carbon black filler. A higher crosslink density in the immediate vicinity of carbon black particles was postulated based on a to-be-expected distribution of secondary electron energy at interfaces with an appreciable change in density between neighboring phases. The invoked difference in network topology, supported by solvent swelling measurements on sulfur- and radiation-crosslinked vulcanizates can explain not only the slightly lower ultimate strength of radiation-cured stocks but also the superior fatigue and crack propagation performance measured for these culcanizates. Finally, theoretical arguments were presented to explain the inferred large strength deficiency of radiation-cured rubbers reported by other investigators on the basis of chain scissions encountered during radiation crosslinking.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070211202
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetics of spherulitic crystallizationThis work is being carried out in the olin center for the study of materials. (1965)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 5 (1965), S. 22-28 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polymer crystallization is discussed with attention given to primary nucleation, spherulite growth, and bulk crystallization. Primary nucleation is the area of least knowledge, and the authors discuss the kinetics of nuclei appearance and recent observations concerning the effects of foreign materials and surfaces. Spherulitic growth rates are discussed in general and specifically with respect to data at low degrees of supercooling in conjunction with secondary nucleation theory. The Avrami Theory and its limitations are discussed in the interpretation of bulk crystallization data. The authors propose that n = 4 in all cases and that the Avrami Theory be used for calculating the primary nucleation rate, kn, not for determining n itself.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760050105
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of recrystallization on the solubility of poly(vinylidene chloride) (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 737-743 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A study of the crystallization of poly(vinylidene chloride) from dilute solution in various solvents was carried out. The temperature at which the polymer dissolved was dependent on crystallization history. The minimum solution temperature obtained by recrystallization at high undercooling and redissolving is the preferred parameter for characterizing solvents for poly(vinylidene chloride).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170306
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  • 10
    Electronic Resource
    Electronic Resource
    Postyield behavior of subchondral trabecular bone (1976)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 537-544 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Cylindrical specimens of bovine subchondral trabecular bone were tested to uniaxial compressive strain levels of 75% to study energy absorption during pore collapse. Stress-strain curves were characterized by macroscopic yield at about 8% strain followed by a significant horizontal pore collapse regime. Energy absorption occurred largely in this postyield regime. Yield strength and energy absorption capacity were found to increase linearly with specimen apparent density. Microstructural analysis of the deformed specimens verified that the mechanism for energy absorption was primarily fracture and buckling of trabeculae. The results suggest that during fracture, the collapse of trabecular bone (and the consequent absorption of energy) serves to attenuate stresses transmitted through the skeleton and thus protect vital structures such as the brain.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820100409
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