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  • Springer  (141)
  • 1975-1979  (113)
  • 1955-1959  (28)
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  • 1
    Electronic Resource
    Electronic Resource
    Two major groups of colicin factors: Their molecular weights (1978)
    Springer
    Molecular genetics and genomics 159 (1978), S. 219-221 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Colicin factors are thought to fall into two taxonomic groups which differ in, amongst other properties, the molecular weight of the plasmid DNA and the host range of the colicin protein. This hypothesis is supported by the plasmids found in 26 colicinogenic strains. Two small Col factors may have arisen from larger factors, judging from similarities between their colicins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270897
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  • 2
    Electronic Resource
    Electronic Resource
    Electromagnetic induction over a two-layer earth with a sinusoidal overburden (1975)
    Springer
    Pure and applied geophysics 113 (1975), S. 591-599 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary An attempt is made to estimate the effect of a sinusoidal variation of the depth of the interface for a two-layer earth model. The source is a line current that varies harmonically with time. A perturbation theory is employed that is valid when the deviation of the sinusoidal interface from a plane is reasonably small compared with a skin depth in the more conductive upper layer. The numerical results indicate that typical impedance and wave-tilt parameters are seriously influenced by the non-uniformity of the overburden thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01592944
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  • 3
    Electronic Resource
    Electronic Resource
    Toxicity and accumulation of thallium in bacteria and yeast (1976)
    Springer
    Archives of microbiology 110 (1976), S. 279-286 
    Details
    ISSN: 1432-072X
    Keywords: Thallium accumulation ; Saccharomyces cerevisiae ; Escherichia coli ; Bacillus megaterium KM ; Thallium toxicity ; Potassium ; Microbial growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thallium sulphate inhibited microbial growth, withBacillus megaterium KM, more sensitive to the metal thanSaccharomyces cerevisiae andEscherichia coli. Inhibition ofB. megaterium KM andS. cerevisiae, but not ofE. coli, was alleviated by increasing the potassium concentration of the medium; inhibition of respiration ofS. cerevisiae, but not ofE. coli, was similarly alleviated. Thallium was rapidly bound, presumably to cell surfaces, byS. cerevisiae andE. coli, and was progressively accumulated by energy-dependent transport systems (probably concerned primarily with potassium uptake) with both organisms. Thallium uptake kinetics suggested more than one transport system operated in yeast, possibly reflecting a multiplicity of potassium transport systems. ApparentK m andK i values for competitive inhibition of thallium uptake by potassium indicatedS. cerevisiae to have a higher affinity for thallium uptake than for potassium, whileE. coli had a transport system with a higher affinity for potassium than for thallium. The likely systems for thallium transport are discussed. A mutant ofE. coli with tenfold decreased sensitivity to thallium was isolated and apparently effected surface binding of thallium in amounts equivalent to the wild type organism, but showed no subsequent uptake and accumulation of the metal from buffer, even though it was able to accumulate potassium to normal intracellular concentrations during growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690239
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of the antitussive effects of codeine phosphate 20 mg, dextromethorphan 30 mg and noscapine 30 mg using citric acid-induced cough in normal subjects (1979)
    Springer
    European journal of clinical pharmacology 16 (1979), S. 393-397 
    Details
    ISSN: 1432-1041
    Keywords: codeine ; dextromethorphan ; noscapine ; cough ; citric acid ; normal subjects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary 1. Protection by codeine 20 mg, dextromethorphan 30 mg, noscapine 30 mg, and placebo against citric acid-induced cough was determined in eighteen healthy subjects. 2. Drug differences occurred at 2 1/2 h following ingestion of the drugs but not at 1 1/4 h. 3. Only codeine 20 mg had a greater antitussive action than placebo, but dextromethorphan 30 mg also did not differ from codeine 20 mg. 4. This technique may offer a useful screening test for the activity of new potential antitussive compounds in man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568199
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibierung der Autoxydation von Polypropylenoxid durch KOH (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 714-714 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01784502
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  • 6
    Electronic Resource
    Electronic Resource
    Tholeiite derivative dyke swarms near Erkowit, Red Sea Hills, Sudan (1977)
    Springer
    International journal of earth sciences 66 (1977), S. 228-237 
    Details
    ISSN: 1437-3262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Abstract Extensive dyke swarms have been identified in basement rocks inland from Suakin with NW, N-S, and E-W trends. Petrographic examination and the results of ten XRF analyses of dykes near Erkowit indicate that they belong to a tholeiitic hornblende microgabbro-microdiorite suite. Eight whole rock K-Ar isotopic analyses suggest two possible periods of emplacement at 616±18 Ma. and 660±19 Ma. ago. These are the first geochemical-geochronological data for Sudanese dykes, and suggest an association with the N.E. African igneous ring-complex province.
    Abstract: Résumé On a compilé de grands ensembles de dykes dans le socle de l'intérieur de Suakin. Ils sont orientés N.O.-S.E., N-S et E-O. Les examens pétrographiques et les résultats de dix analyses par fluorescence X, des dykes dans la région d'Erkowit indiquent leur apparartenance à une suite tholéiitique de microgabbro ou microdiorite à hornblende. Huit analyses isotropiques de la roche totale par la méthode K-Ar suggérent deux possibilités de la période d'emplacement, 616±18 Ma et 660±19 Ma. Ces premiers éléments d'information géochimiques et géochronologiques concernant les dykes soudanais suggérent une association avec la province du ring-complex du N.E. Africain.
    Notes: Zusammenfassung Ausgedehnte Ansammlungen von Gängen in nordwestlichen, nord-südlichen und ostwestlichen Richtungen wurden im Grundgebirge landeinwärts von Suakin festgestellt. Eine petrographische Überprüfung und die Ergebnisse von zehn XRF-Analysen von Gängen in der Nähe von Erkowit deuten auf eine tholeiitische Homblende-Mikrogabbro-Mikrodiorit-Gruppe hin. Acht K/Ar-Isotopenanalysen legen zwei mögliche Entstehungsperioden um 616±18 Millionen Jahre und 660±19 Millionen Jahre nahe. Dies sind die ersten geochemisch-geochronologischen Daten für sudanesische Gänge; sie weisen auf eine Verbindung mit der nordostafrikanischen plutonischen Ringkomplex Region hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01989574
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  • 7
    Electronic Resource
    Electronic Resource
    On the cytotaxonomy of phasmids (Phasmatodea) (1959)
    Springer
    Chromosoma 10 (1959), S. 268-277 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A wide diversity in chromosome complement is found in two species of phasmids of the primitive group Prisopini—Prisopus ariadne Hebard and Prisopus berosus Westwood. P. ariadne has a diploid male complement of 28, comprising 13 pairs of relatively large mediokinetic autosomes and Neo XY sex chromosomes. P. berosus, 2n ♂=49, has relatively small autosomes most of which are mediokinetic, and retains the XO—XX sex mechanism. Chromosomal polymorphism in this species is suggested by the presence of an unequal pair of autosomes and a structural differentiation in the X in one of two males studied. The relative amount of DNA per nucleus in male germ cells (Peulgen cytophotometry) shows a significant difference in total chromosomal content between the complements of the two species. These data are discussed with reference to the cytotaxonomy of phasmids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396574
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  • 8
    Electronic Resource
    Electronic Resource
    Scanning electron microscopy of barley protoplasts (1976)
    Springer
    Protoplasma 90 (1976), S. 399-405 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Scanning electron micrographs of barley protoplasts were compared using various preparatory techniques. Numerous features were observed which turned out to be artifactual characteristics of the processing procedure used in collecting and dehydrating the samples. The most successful technique gave protoplasts which presumably maintained their natural structural integrity, as judged by retention of sphericity and absence of holes in the plasma membrane. The relative numbers of fragmented protoplasts and cellular organelles was also greatly reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01275690
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrastructure of nuclei isolated from plant protoplasts (1977)
    Springer
    Protoplasma 93 (1977), S. 267-274 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A simple method, involving selective Triton X-100 membrane solubilization, has been developed for the isolation of nuclei from barley and tobacco protoplasts which gives a high yield of essentially pure nuclei. The isolated nuclei resembled those in leaf cells and protoplasts when the isolated nuclei were fixed for short times (2 hours, Medium II), except that their chromatin appeared to be more highly condensed and barley nuclei also lacked the outer nuclear membrane. When longer times of fixation (12 hours, Medium I) were used, the isolated nuclei lacked the characteristic condensed chromatin appearance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01275658
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  • 10
    Electronic Resource
    Electronic Resource
    Neutrons and nuclear structure (1956)
    Springer
    Atomic energy 1 (1956), S. 715-725 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Notes: Synopsis In the past few years slow neutron spectrometers of greatly improved resolving power have been developed at many laboratories throughout the world. During the same period advances in techniques of data analysis have aided in producing the information now available on hundreds of neutron resonances. The manner in which the parameters of these resonances give valuable information on nuclear structure will be described. The experimental findings will be reviewed and particular emphasis paid to their bearing on current theoretical nuclear models. The following aspects will be emphasized. 1) The radiation widths of nuclear energy levels and their relationship to theoretical transition probabilities. 2) The size distributions of neutron widths of levels and recent theoretical treatments of these distributions. 3) The average spacings of levels for different nuclei as well as the apparent non-random distribution of spacings for individual nuclei. 4) The probability of compound nucleus formation, or strength function, compared to recent calculations based on the cloudy crystal nuclear model. 5) Recent determinations of the nuclear radius at high and low neutron energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01480908
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