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  • 1970-1974  (27)
  • 1960-1964  (21)
  • 1940-1944
  • 1974  (27)
  • 1962  (21)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 66 (1962), S. 1361-1362 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 15 (1962), S. 255-259 
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of the proton, helium, (C, N, O) and Fe-group nuclei fluxes made during the large 4 August 1972 solar particle event are presented. The results show a small, but significant variation of the composition of multiply-charged nuclei as a function of energy in the energy region above 10 MeV nucleon−1. In particular, the He/(C, N, O) abundance ratio varies by a factor ∼ 2 between 10 and 50 MeV nucleon−1 and the Fe-group/(C, N, O) ratio suggests a similar variation. Abundance ratios from the 4 August 1972 event are compared as a function of energy with ratios measured in other solar events to show that several of the earlier results are consistent with an energy variation like that observed in August 1972, while certain other events must have had a substantially different dependence of composition on energy. At energies ≳50 MeV nucleon−1, the He/(C, N, O) abundance ratio for August 1972 is consistent with all earlier measurements made above that energy which suggests that variations may vanish at high energies.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 30 (1974), S. 187-213 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of detailed calculations on the production of H2 and He3 nuclei by cosmic ray protons and helium nuclei in interstellar medium are presented. The flux and energy spectra of these nuclei as well as those of cosmic ray H1 and He4 nuclei in the vicinity of the Earth are calculated. For this purpose the source spectra are assumed to be in the form of a power law in total energy per nucleon with an additional velocity dependent term. This spectrum denoted as Fermi Spectrum, is about midway between the power law spectrum in rigidity and in total energy per nucleon. The fluxes are calculated taking into account: (1) energy dependent cross-sections of thirteen nuclear reactions of cosmic ray protons and helium nuclei with interstellar H1 and He4 leading to the production of H2 and He3 nuclei, (2) angular distributions and kinematics of these reactions, (3) ionization loss of the primary and secondary nuclei in interstellar medium, (4) elastic collisions of cosmic ray protons and helium nuclei, (5) distributions of cosmic ray path-lengths in in terstellar space as in gaussian and exponential forms, and (6) interplanetary modulation of cosmic rays from the numerical solution of the complete Fokker-Planck equation describing the diffusion, convection and adiabatic deceleration of cosmic ray nuclei in the solar system. On comparing the calculated values of H2/He4 and He3/(He3+He4) as a function of energy with the observed data of several investigators, it is found that agreement between the calculated values and most of the observed data is obtained on the basis of: (a) source spectrum in the form of ‘Fermi’ Spectrum, (b) distribution of path-lengths as in the gaussian form with a mean value of 4 g cm−2 of hydrogen or as in exponential form with leakage path length of 4 g cm−2.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 130 (1974), S. 261-270 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A class of mutants with SmR (streptomycin resistance) phenotype has been isolated from a strA1/strA + (streptomycin resistant allele/streptomycin sensitive allele) heterozygote merodiploid. The mutation is located in the strA gene of the E. coli chromosome. However, the streptomycin phenotype of the haploid strain is not altered. It has been suggested that the alteration in the structure of the strA + gene product (protein S12 which forms an integral part of the 30S subunit) leads to a change in the assembly of the smaller subunit. Thus, a possible mechanism for the mutation is postulated in the regulation of ribosomal subunit formation at the assembly step.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 185 (1962), S. 31-38 
    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 Adsorption vieler Arten von Makromolekülen an einer flüssig/flüssig-Grenzfläche erhöht oft den Widerstand gegen die Koaleszenz von Öltropfen in Wasser und umgekehrt. Eine quantitative Studie der Koaleszenzzeiten für Flüssigkeitstropfen, die unter einer flüssig/flüssig-Grenzfläche ruhen, wurde versucht. Die Ergebnisse lassen sich mit rheologischem Verhalten (a. a. 0.), Löslichkeit und Struktur des adsorbierten Filmes erklären. Es läßt sich eine allgemeine Koaleszenzzeit ableiten für den Zusammenhang der Koaleszenzzeit mit Viskoelastizität und Dicke des adsorbierten Films, sowie der kritischen Verformung der zunächst planen Grenzfläche unter dem Auftrieb des Tropfens.
    Notes: Summary The adsorption of many types of macromolecule at liquid/liquid interfaces very often greatly increases the resistance to coalescence of oil droplets in water and vice verca. A quantitative study has been attempted of the coalescence times for liquid droplets resting under plane liquid/liquid interfaces. These results have been interpreted in the light of the rheology (investigated elsewhere), solubility and structure of the adsorbed films. A general equation has been derived relating the time for coalescence to the viscoelasticity and thickness of the adsorbed film and the critical distortion of the plane interface under the weight of the drop.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 186 (1962), S. 57-61 
    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 sehr hohe Grenzflächenviskoelastizität, die von adsorbierten Albuminfilmen an der Grenzfläche Petroleumäther/Wasser auftritt, wird durch geringe Konzentrationen von sowohl ionisierenden wie nicht ionisierenden oberflächenaktiven Substanzen zerstört. Die Abwanderung des Albumins von der Grenzfläche wird sicherlich durch hohe Konzentrationen von ionischen grenzflächenaktiven Substanzen verursacht, und es läßt sich zeigen, daß dies der wahrscheinlichste Wirkungsmechanismus dieser zugegebenen Moleküle ist. Bei nichtionisierten aliphatischen Alkoholen wird das Albumin nicht vollständig aus der Grenzfläche entfernt, und die Ergebnisse für die Elastizität und den Oberflächendruck lassen sich entweder durch teilweise Abwanderung erklären oder durch die Annahme, daß das adsorbierte Protein nur teilweise oberflächendenaturiert ist.
    Notes: Summary The very high interfacial visco-elasticity exhibited by adsorbed albumin films at the petroleum ether/water interface is destroyed by small concentrations of both ionized and unionized surface active substances. The displacement of the albumin from the interface is certainly brought about by high concentrations of the ionic surfactants and it is shown that this is the most likely mechanism of action for these molecules. For the unionized aliphatic alcohol the albumin is not completely displaced from the interface and the elasticity and surface pressure measurements could be explained either by partial displacement or by the assumption that the adsorbed protein is only partly surface denatured.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 40 (1974), S. 221-231 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four chemical agents, EMS EMS: Ethyl methanesulfonate; MNNG: N-methyl-N\t'-nitro-N\t'-nitrosoguanidine; NA: Nitrous acid; ICR-170: 2-methoxy-6-chloro-9-[3-(ethyl-2-chloroethyl) aminopropylamino] acridine 2 HCl; UV: Ultra violet radiation. , MNNG, NA, ICR-170, as well as UV were used to induce mutations in the wild-type haploid strain X2180-1B (α) of Saccharomyces. A total of 2053 (EMS, 427; MNNG, 444; NA, 469; ICR-170, 456; UV, 257) lysine-requiring mutant clones were isolated from many independent treatments and by nystatin enrichment technique. Mutants were classified into various functional groups on the basis of complementation analysis with 14 tester strains (lys 1 to lys 15 except lys 3). Of the clones analyzed, the number of isolates unable to complement with a given tester strain ranged from 2 for lys 5 to 918 for lys 4. Three of the mutually complementing lysine loci (lys 1, lys 2, and lys 4) accounted together for over 85% of the mutant clones whereas lys 6, lys 7, lys 8, and lys 14 had less than 10 noncomplementing isolates each. Mutants for lys 4 were most frequent with all of the mutagens tested except with NA in which case the mutants for lys 2 were most frequent. A total of 56 isolates failed to complement with lys 10, lys 11, and lys 12. Similarly, 47 isolates failed to complement with lys 9 and lys 13 simultaneously. Only 44 isolates complemented with all of the tester strains used.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 9 (1974), S. 430-433 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The thermal decomposition of ferrous oxalate dihydrate FeC2O4.2H2O, has been investigated using thermogravimetric (TG), differential thermogravimetric (DTG), differential thermal analysis (DTA), X-ray diffraction and infra-red spectroscopic techniques. The DTA data obtained in air consist of an endothermic dehydration peak at ∼ 190
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 192 (1962), S. 376-378 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die einzelnen Gruppen des qualitativen Kationentrennungsganges werden mit 60%igem Äthanol als Lösungsmittel papierchromatographisch nach der aufsteigenden Methode getrennt. Zum Nachweis der getrennten Ionen werden organische Reagentien benutzt.
    Notes: Summary The filter paper strip Chromatographic separation of the individual members of various groups of the qualitative analysis chart has been described. Use has been made of the ascending method, using 60% aqueous ethanol as solvent. The migrated ions are detected after their separation by the use of organic reagents.
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