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  • 1
    Electronic Resource
    Electronic Resource
    Low-frequency infrared spectral studies on triphenylphosphine, -arsine, and -stibine derivatives of iron and molybdenum carbonyl complexes (1968)
    s.l. : American Chemical Society
    Inorganic chemistry 7 (1968), S. 1236-1238 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50064a042
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  • 2
    Electronic Resource
    Electronic Resource
    Colchicine induced chromosomal interchange in castor beans (Ricinus communis linn.) (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 1037-1037 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung In mit Colchicin behandelten Pflanzen vonRicinus communis wurden neben tetraploiden Zellen auch solche mit Chromocomenbrüchen gefunden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138732
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  • 3
    Electronic Resource
    Electronic Resource
    Amylase and polyphenol oxidase production by germinating conidia ofColletotrichum falcatum Went (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 117-118 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Keimende Konidien vonColletotrichum falcatum bilden Amylase und Polyphenoloxydase. Die Enzymproduktion ist bei einem «Lichtstamm» höher als bei einem «Dunkelstamm».
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02146930
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  • 4
    Electronic Resource
    Electronic Resource
    Epistatic, additive and dominance variation in a triple test cross of bread wheat (Triticum aestivum L.) (1982)
    Springer
    Theoretical and applied genetics 62 (1982), S. 49-52 
    Details
    ISSN: 1432-2242
    Keywords: Epistasis ; Triple test cross ; Triticum aestivum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Triple test cross progenies resulting from the crossing of three testers (‘Kloka’, ‘UP 368’ and an f1 intermediate between them) and 24 varieties of bread wheat have been studied for plant height (cm), peduncle length (cm), ear length (cm), number of spikelets per spike and harvest index (ratio between economic and total yield). Epistasis was not significant for any of the characters studied. The testers were inadequate for plant height and for peduncle length although the testers varied considerably for these traits. Additive variance played a significant role in the inheritance of all the characters except number of spikelets per spike. The dominance variance was important for plant height, ear length and harvest index. The degree of dominance was in the over-dominance range for plant height. Complete dominance was operative for ear length, number of spikelets per spike and harvest index whereas for peduncle length only partial dominance was observed. The possibility of the isolation of the recombinants with high harvest index has been stressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276282
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  • 5
    Electronic Resource
    Electronic Resource
    24MgH+ in the solar photospheric spectrum (1984)
    Springer
    Astrophysics and space science 102 (1984), S. 287-293 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The24MgH+ (A 1Σ+ −X 1Σ+) molecular lines have been identified in the photospheric spectrum. The rotational excitation temperature determined from the analysis of molecular line intensities of24MgH+ is found to be of the order of 4850 K which corresponds to the photospheric temperature of the Sun. The CNDO/2 dipole moments of24MgH+ for internuclear distance range: (1.3–2.1) Å in theX 1Σ+ state can be approximated byM(R)=4.92+1.33R. Estimations for the spontaneous emission Einstein coefficients (A v′ v″ ) and the absorption oscillator strengths (f v′ v″ ) for the (1, 0), (2, 0), and (2, 1) transitions in theX 1Σ+ state of the24MgH+ ion are also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650177
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  • 6
    Electronic Resource
    Electronic Resource
    Study on the thermal behaviours of homo- and copolymers of styrene, MA and AN by thermogravimetry (1982)
    Springer
    Journal of thermal analysis and calorimetry 25 (1982), S. 387-390 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Basierend auf nicht-isotherme thermogravimetrische Untersuchungen wurde das thermische Verhalten von Polystyrol [PS], Polymethacrylat [PMA], Polyacrylnitril [PAN], Polystyrol-co-methacrylat [P(S: MA)] (alternierend und random), Polystyrolco-acrylnitril [P(S: AN)] (alternierend) sowie eines Mischpolymeren von Styrol, Methacrylat und Acrylnitril [P(S: MA: AN)] untersucht. Die thermische Stabilität der Kopolymeren liegt zwischen denen der individuellen Homopolymeren. Die thermische Stabilität des Kopolymeren [P(S: AN)] ist höher als die der individuellen Homopolymeren. Die Werte der Aktivierungsenergie sind ebenfalls in Übereinstimmung mit dem thermischen Verhalten dieser Polymere.
    Abstract: Резюме На основе неизотерми ческих термогравиметричес ких исследований, обс уждено термическое поведен ие полистирола, полиметилакрилата, п олиакриронитрила, ко полимера полистирола и метила крилата (чередующего ся и произвольного), копол имера полистирола (чередующе- гося), и трех звенного полимера стирол-метилакрилат-акрилонитрил. Найден о, что термическая усто йчивость кополимеро в является промежуточной среди индивидуальных гомополимеров. Устой чивость трехзвенног о полимера стирол-мети лакрилатакрилонжтр ил является наиболее вы сокой по сравнению с отдельными гомополи мерами. Значения энергии активации со гласуются с термичес ким поведением исследов анных полимеров.
    Notes: Abstract The thermal behaviours of polystyrene (PS), polymethylacrylate (PMA), polyacrylonitrile (PAN), polystyrene-co-methylacrylate [P(S: MA)](alternate and random), polystyrene-co-acrylonitrile [P(S: AN)] (alternate) and a terpolymer of styrene, methylacrylate and acrylonitrile [P(S: MA: AN)] are discussed on the basis of non-isothermal thermogravimetric studies. The thermal stabilities of the copolymers have been found to be intermediate between of those of the individual homopolymers. The stability of the [P(S: AN)] copolymer is higher than those of the individual homopolymers. The activation energy values are also in accordance with the thermal behaviours of these polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912964
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  • 7
    Electronic Resource
    Electronic Resource
    Solvation of ions. Part XXIX. Ionic conductances in acetonitrile-water and pyridine-water mixtures (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 103-119 
    Details
    ISSN: 1572-8927
    Keywords: Conductance ; Walden product ; tetraphenylarsonium and tetraphenylboride ions ; pyridine-water and acetonitrile-water mixtures ; alkali metal salts ; copper salts ; ion-solvent interactions ; structural effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The limiting conductance of various salts of Na+, Ag+, Cu+, Cu2+ and Ph4As+ in acetonitrile-water (AN-H2O) and pyridine-water (Py−H2O) mixtures are reported. Single ion values are calculated for AN-H2O mixtures using the TATB assumption [λo(Ph 4 As +) = λo(Ph 4 B −)]. The trends observed for the limiting Walden products (λoη) of the electrolytes and individual ions are discussed in terms of specific ion-solvent interactions and the structural effects of the solvent mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646043
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  • 8
    Electronic Resource
    Electronic Resource
    Solvation of ions, part XXX. Thermodynamics of transfer of copper ions from water to solvent mixtures (1982)
    Springer
    Journal of solution chemistry 11 (1982), S. 495-508 
    Details
    ISSN: 1572-8927
    Keywords: Thermodynamic transfer quantities ; acetonitrile ; pyridine ; 2-hydroxycyanoethane ; aqueous organic solvent mixtures ; Cu2+, Cu+, and Ag+ ions ; hydrometallurgy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Free energies and Walden products show that the Cu+ and Ag+ ions are specifically solvated by acetonitrile (AN), 2-hydroxycyanoethane (HAN), and by pyridine (Py) whereas Na+ is specifically solvated by water, in mixtures of these organics with water. The Cu2+ ion is specifically solvated by pyridine in pyridine-water mixtures, but by water in acetonitrile-water mixtures. Ion-solvent, coordinated solvent-bulk solvent, and solvent-solvent interactions produce large entropy losses in the order Cu+≫Ag+〉Na+ for transfer of these ions from water to dilute acetonitrile-water. The metallurgically important oxidations of copper, silver, CuS and Cu2 with CuSO4 in water are strongly favored in an enthalpic and free energy sense by the addition of acetonitrile, but addition of acetonitrile also produces a large loss of entropy for the reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647111
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  • 9
    Electronic Resource
    Electronic Resource
    The 3410 Å band of the PH molecule in the solar photospheric spectrum (1984)
    Springer
    Solar physics 90 (1984), S. 259-268 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some weak unidentified solar photospheric lines in the wavelength range: (3400–3465) Å may be due to PH lines of the (0, 0) band of the PH(A 3 Π i - X 3 ∑-)system. These faint PH molecular lines have resulted an excitation temperature of the order of 4500 K. Using experimental lifetime data for PH in the A 3 Π i state, an absorption oscillator strength f 00 = 0.0075 is derived for the 3410 Å band of the PH (A 3 Π i - X 3 ∑-)system. Accurate line positions, oscillator strength and transition probability for the 4.4μ fundamental rotation-vibration band of the PH molecule are obtained. A comparison of positions of some lines of the 4.4μ band with those obtained on new tracings of high resolution solar spectra shows many coincidences with weak solar lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173954
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  • 10
    Electronic Resource
    Electronic Resource
    Isolation and characterisation of nitrate reductase mutants and regulation of nitrate reductase and nitrogenase in the cyanobacterium Nostoc muscorum (1984)
    Springer
    Molecular genetics and genomics 195 (1984), S. 180-185 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Chlorate resistant mutants of the cyanobacterium Nostoc muscorum isolated after N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) mutagenesis were found to be defective/blocked in nitrate reductase (NR). The parent strain possessed active NR in the presence of nitrogen as nitrate and only basal levels of activity in ammonia and N-free grown cultures. Addition of ammonia suppressed the NR activity in the parent strain whereas addition of L-methionine DL-sulphoximine (MSX) restored NR activity. A similar repression by ammonia, glutamine and derepression with MSX were also observed for nitrogenase synthesis. One class of mutants lacked NR activity (nar -) whereas the specific activity of NR was low in another class of mutants (nar def). Unlike the parent, the mutants synthesized nitrogenase and differentiated heterocysts in the presence of nitrate nitrogen. Uptake studies of nitrite and ammonia in mutants revealed that they possessed both nitrite reductase and glutamine synthetases (GS) at low levels, and the same level respectively in comparison with the parent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332743
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