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  • 1
    Electronic Resource
    Electronic Resource
    Physiological responses in Nile tilapia exposed to different photoperiod regimes (2004)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 65 (2004), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: After conditioning Nile tilapia Oreochromis niloticus for 2 weeks, the photoperiod regime of 12 tanks of fish was changed to a 6L : 6D photoperiod while 12 further tanks were retained on the conditioning photoperiod regime (12L : 12D). Blood samples were collected 3 days (first sampling) and 3 months (second sampling) after changing the photoperiod regime. Blood was collected at 6 h intervals from both photoperiod regimes (1000, 1600, 2200 and 0400 hours). At the first sampling time, fish in the 6L : 6D had significantly higher cortisol both in the light and dark phases than levels in fish in the 12L : 12D photoperiod. At the second sampling time, the levels were significantly higher only in the light phase. The levels of cortisol, glucose and Cl− in fish exposed to the 6L : 6D photoperiod, however, were far lower than those of acute stress-induced levels observed in fish exposed to a stress experiment. Furthermore, there were no significant differences in overall values of all the variables between the photoperiod regimes at the second sampling time. This indicated that the fish exposed to the 6L : 6D photoperiod were not chronically stressed. Significantly higher blood lymphocyte counts were observed in fish exposed to the 6L : 6D compared to those of the 12L : 12D photoperiod during the light phase at the second sampling time. Other variables (glucose, Cl−, haematocrit and neutrophil) did not show a significant difference between the treatments at either sampling time. These results demonstrated that the artificial photoperiod regime did not cause a significant acute or chronic stress response in Nile tilapia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2004.00487.x
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of Carbon Dioxide in the Calcite–Sodium Oleate Flotation System (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 1255-1255 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To study the calcite-carbon dioxide-water system transparent calcite crystals were wet ground and sieved. About 20 g of moist samples of -120+140 ASTM mesh size range were treated with 150 ml. of distilled and deionized water in a 500 ml. reagent bottle and then carbon dioxide was bubbled ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2171255a0
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  • 3
    Electronic Resource
    Electronic Resource
    Regulation of monocarpic senescence of Brassica campestris by the developing pods (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 71 (1987), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Senescence of Brassica campestris L. cv. B-9 was studied with regard to seed maturation and source-sink relationships. In normal control plants leaf senescence (as determined by the change in chlorophyll level) started and proceeded in a progressive manner from base to apex during the period of early pod setting. Complete yellowing of the leaves occurred well before the seed maturation and pod wall senescence. The pod wall always senesced before the attainment of final seed weight. In two different sets of acrocarpous plants containing 65 pods and 10 pods, respectively, leaf senescence was delayed during the pod filling period. It started non-sequentially after complete yellowing and senescence of the pod wall. The degree of leaf senescence at the post-pod filling stage was almost proportional to the number of pods present. When peduncles of the acrocarpous 10-podded plants were removed after the pod filling stage of the plant, leaf senescence was delayed compared to plants whose pedicels were removed, although the senescence pattern of the upper three leaves was nonsequential in both cases. Defruiting at an early stage of development delayed leaf senescence, although the pattern of such senescence remained unaltered (i.e. nonsequential). Defoliation hastened the seed-filling process and pod wall senescence. Plants containing fewer pods had higher average seed weight, although yield per plant was reduced.These results suggest that the pod wall serves as a temporary as well as intermediary storage organ and that foliar senescence is not directly related to seed maturation. The possible cause of uncoupling between foliar senescence and seed development is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1987.tb04622.x
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  • 4
    Electronic Resource
    Electronic Resource
    Monocarpic senescence in wheat: Influence of sterile glumes and ear (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 67 (1986), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The senescence of sterile glumes, flag leaf and the other two leaves below the ear of wheat (Triticum aestivum L. cv. Sonalika) was studied in relation to grain development and surgical manipulation. The senescence of sterile glumes was faster than that of the leaves in terms of chlorophyll and protein degradation. The flag leaf senesced later than the other two leaves below it. Removal of sterile glumes markedly reduced the harvest index (crop: straw ratio) and average dry weight per grain as compared to removal of the flag leaf. Maximum grain weight was achieved after the glumes had senesced completely. Removal of the ear delayed senescence of all the three leaves. It is concluded that sterile glumes are important suppliers of assimilate for grain filling and that nutrient drainage is the primary cause of the monocarpic senescence in wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1986.tb05758.x
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  • 5
    Electronic Resource
    Electronic Resource
    Anionic-nonionic surfactant interaction by nuclear magnetic resonance (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 1083-1088 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The interaction between anionic (sodium dodecyl benzene sulfonate) surfactant and nonionic (Tri and Tetra propylene glycol monomethyl ether) surfactant was studied using nuclear magnetic resonance measurement. It was observed that the addition of sodium dodecyl benzene sulfonate to the solution of nonionic surfactant (Tri and Tetra propylene glycol mono methyl ether) caused an upfield shift of the central protons of the nonionic surfactants. The aromatic protons of sodium-dodecyl benzene sulfonate undergo a very small, almost negligible, downfield shift. The changes in the chemical shift values and the integration values of the polypropylene protons and benzene protons was interpreted in terms of mixed micelle formation with the simultaneous presence of highly fluid mixed micelles of varying compositions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01761120
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  • 6
    Electronic Resource
    Electronic Resource
    Penicillin-induced formation of ribonuclease in rice (Oryza sativa L.) endosperm and its inhibition by abscisic acid (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 1322-1323 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Penicillin stimulates the formation of ribonuclease in embryoless rice (Oryza sativa L.) endosperm and enhances gibberellin-induced response. Penicillin-induced RNase production is completely inhibited by abscisic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01963985
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  • 7
    Electronic Resource
    Electronic Resource
    Comparative sedimentation and electrophoresis studies for zeta-potential measurement (1976)
    Springer
    Colloid & polymer science 254 (1976), S. 522-529 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Arbeit befaßt sich mit dem Vergleich der Ξ-Potentialbestimmung mit 4 verschiedenen Methoden. Die Bestimmung des Sedimentationspotentials nachQuist undWashburn wurde modifiziert und verbessert. Als System wurden sphärische Glaspartikel und nichtkugelige Rutilpartikel in KCl- und BaCl2-Lösungen verwendet. Differenzen bis zu 20% traten auf. Als Ursache werden i) Unvollständigkeit der Theorie ii) Oberflächenleitfähigkeit und iii) Unterschiede in der Dicke der hydrodynamischen Grenzschicht diskutiert.
    Notes: Summary Very little literature exists regarding comparability of Ξ-potential values of identical systems computed by means of more than one of the four known categories of methods. Of the four methods, two, viz. sedimentation potential (SP) and electrophoretic mobility (EM) methods involve migration of solid particles immersed in liquid medium under force fields, and hence merit comparative investigation. The procedure for measurement of sedimentation potential outlined byQuist andWashburn (8) has been modified and improved upon. ΞSP and Ξ EM values for spherical glass particles as well as non-spherical rutile particles immersed in KCl and BaC2 solutions in different concentrations show discrepancies of the order of ±20 percent. This exceeds cumulative reproducibility error, and may be due to (i) imperfection in theory (ii) surface conductivity effect and (iii) difference in hydrodynamic boundary layer thickness values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410920
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  • 8
    Electronic Resource
    Electronic Resource
    On a method of computation of scattering amplitudes and on ionization of hydrogen atoms (1988)
    Springer
    Czechoslovak journal of physics 38 (1988), S. 1140-1145 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The general expressions for the scattering amplitudes due to Das have been rederived following a new approach. It is possible in this approach to improve the results considerably. Ionization of hydrogen atoms by electrons and positrons has also been considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598015
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  • 9
    Electronic Resource
    Electronic Resource
    Elastic scattering of electrons by hydrogen atoms in the (2p) state (1984)
    Springer
    Czechoslovak journal of physics 34 (1984), S. 908-912 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Conclusion Since our results are the first set of results in this field, their accuracy can be judged when further results through other methods and through experiment are available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01589820
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  • 10
    Electronic Resource
    Electronic Resource
    7th World Congress on water resources Rabat, Morocco, 13–18 May, 1991 (1991)
    Springer
    GeoJournal 25 (1991), S. 118-118 
    Details
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179779
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