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  • 1
    Digitale Medien
    Digitale Medien
    Metamorphic petrology and zircon geochronology of high-grade rocks from the central Mozambique Belt of Tanzania: crustal recycling of Archean and Palaeoproterozoic material during the Pan-African orogeny (2003)
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 21 (2003), S. 0 
    Details
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: New data on the metamorphic petrology and zircon geochronology of high-grade rocks in the central Mozambique Belt (MB) of Tanzania show that this part of the orogen consists of Archean and Palaeoproterozoic material that was structurally reworked during the Pan-African event. The metamorphic rocks are characterized by a clockwise P–T path, followed by strong decompression, and the time of peak granulite facies metamorphism is similar to other granulite terranes in Tanzania. The predominant rock types are mafic to intermediate granulites, migmatites, granitoid orthogneisses and kyanite/sillimanite-bearing metapelites. The meta-granitoid rocks are of calc-alkaline composition, range in age from late Archean to Neoproterozoic, and their protoliths were probably derived from magmatic arcs during collisional processes. Mafic to intermediate granulites consist of the mineral assemblage garnet–clinopyroxene–plagioclase–quartz–biotite–amphibole ± K-feldspar ± orthopyroxene ± oxides. Metapelites are composed of garnet-biotite-plagioclase ± K-feldspar ± kyanite/sillimanite ± oxides. Estimated values for peak granulite facies metamorphism are 12–13 kbar and 750–800 °C. Pressures of 5–8 kbar and temperatures of 550–700 °C characterize subsequent retrogression to amphibolite facies conditions. Evidence for a clockwise P–T path is provided by late growth of sillimanite after kyanite in metapelites. Zircon ages indicate that most of the central part of the MB in Tanzania consists of reworked ancient crust as shown by Archean (c. 2970–2500 Ma) and Palaeoproterozoic (c. 2124–1837 Ma) protolith ages. Metamorphic zircon from metapelites and granitoid orthogneisses yielded ages of c. 640 Ma which are considered to date peak regional granulite facies metamorphism during the Pan-African orogenic event. However, the available zircon ages for the entire MB in East Africa and Madagascar also document that peak metamorphic conditions were reached at different times in different places. Large parts of the MB in central Tanzania consist of Archean and Palaeoproterozoic material that was reworked during the Pan-African event and that may have been part of the Tanzania Craton and Usagaran domain farther to the west.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1525-1314.2003.00491.x
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  • 2
    Digitale Medien
    Digitale Medien
    Kompensation extremer Umwelteinflüsse beiBalanus balanus als Anpassung an die sessile Lebensweise (1979)
    Springer
    Helgoland marine research 32 (1979), S. 200-212 
    Details
    ISSN: 1438-3888
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In the sessile barnacleBalanus balanus L. the relationship between stimulus duration and reaction intensity varies considerably. Investigations on the light reactions (increased cirral activity per unit time) and shadow reactions (decreased cirral activity per unit time) showed that increase of stimulus duration at a temporal range of 1–5 min and 30–360 min causes an increased response intensity, whereas, at a range of 5–30 min, the response intensity decreases. Two adaptive systems are assumed to be responsible for this behaviour. The peculiarities of the light and shadow reactions are interpreted as a result of interactions of central and peripheral components, but the unusual relationship between stimulus duration and reaction intensity is probably based on a greater influence of central components. The biological significance of the light and shadow reactions is discussed in relation to the larval and adult life: By means of the central variation of stimulus threshold in the described protective shadow responsesB. balanus seems to compensate for extreme environmental conditions. The light responses observed in the adults are considered as resulting from metamorphosis of larval swimming activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02189897
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  • 3
    Digitale Medien
    Digitale Medien
    Die Belichtungsreaktionen sessiler Crustaceen(Balanus balanus) als Alternative zu den Schutzreaktionen bodenbewohnender mariner Wirbelloser (1977)
    Springer
    Helgoland marine research 29 (1977), S. 493-502 
    Details
    ISSN: 1438-3888
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Shadow responses, including reactions to both increase (“on“) and decrease (“off“) in light intensity have been hitherto described in the adults of various bottom-dwelling marine invertebrates. These reactions as expressed by decrease in activity are assumed to be protective (withdrawal responses, kinetic rigidity after v. Buddenbrock, 1952). By contrast, the free-swimming larvae of these species normally show increase in activity to both increase and decrease in light intensity as expressed by negative or positive photoresponses. In the sessile barnacleBalanus balanus L. reactions to increase in light intensity are demonstrated which, contrary to the withdrawal responses or kinetic rigidity, result in an increase of cirral activity. The shadow responses of the barnacles (“off responses“) are described as withdrawal responses. The light responses are expressed by two different modes of behaviour: (a) If an active barnacle is stimulated by increase in light intensity, the frequency of cirral activity increases; (b) if an inactive barnacle is stimulated by increase in light intensity, the cirral activity arises a short time later. The light responses observed are interpreted as a metamorphosis of larval swimming activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01609986
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  • 4
    Digitale Medien
    Digitale Medien
    Belichtungs-und Beschattungsreaktionen beiBalanus balanus (1978)
    Springer
    Helgoland marine research 31 (1978), S. 298-302 
    Details
    ISSN: 1438-3888
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The present paper reports on the responses of the barnacleBalanus balanus L. to various light-dark cycles (30/30 min–360/360 min). As measured by cirral activity (cirrus beats per unit time), an increase of stimulus duration causes an increase of response intensity. The results obtained indicate that the previously described light and shadow reactions inB. balanus (Sommer, 1977) depend on the acclimation times of exposure to light or dark, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02189483
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  • 5
    Digitale Medien
    Digitale Medien
    Das erste Thiomercurat(II) mit Inselstruktur: K6[HgS4] (1976)
    Springer
    Naturwissenschaften 63 (1976), S. 194-195 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00624223
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  • 6
    Digitale Medien
    Digitale Medien
    Development of a system useful for studying the formation of unstable alleles of IS2 (1979)
    Springer
    Molecular genetics and genomics 173 (1979), S. 15-21 
    Details
    ISSN: 1617-4623
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary IS2-induced deletions of the gal control region were isolated in a plasmid carrying gal OP-308 :: IS2-7. This contains a 54 basepair long, unstable mini insertion within IS2, thus allowing constitutive expression of the gal structural genes. Deletion PPI is 11.9 kilobasepairs (kb) long and is Gal+ because it has retained the mini insertion. In PP4 7.2 kb DNA material including markers gal OP, chlD and pgl are deleted. PP4 has lost the mini insertion and is therefore Gal negative. DNA sequencing of the newly formed junction in PP4 reveals that the deletion terminates precisely at nucleotide 1 of IS2 and that no DNA sequence homology is involved in this IS2-mediated deletion formation. PPI segregates Gal- clones due to the loss of the mini insertion. One such segregant PPIS and PP4 both give only constitutive Gal+ revertants, which consist of the previously known mini insertions and also a new class of “supermini” inserts within IS2 of about 10 to 20 basepairs long. Therefore, PPIS and PP4 can be used to study various parameters involved in the formation of mini insertions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00267686
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  • 7
    Digitale Medien
    Digitale Medien
    Ein algebraisches Verfahren zur Lösung von gemischten Anfangsrandwertproblemen aus der Theorie instationärer GitterströmungenHerrn Prof. Dr. H. Söhngen zu seinem 70. Geburtstage am 30. November 1978 gewidmet. (1979)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 1 (1979), S. 158-186 
    Details
    ISSN: 0170-4214
    Schlagwort(e): Mathematics and Statistics ; Applied Mathematics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik
    Notizen: Mixed boundary value problems for the wave-equation in the x-y-plane, with boundaries parallel to the x-axis, are usually treated by Laplacetransformation. To use this method numerically we present it here by means of the Mikusiński-calculus. In this paper our main interest lies in the treatment of mixed initial-boundary value problems arising in unsteady subsonic cascade flow.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mma.1670010204
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  • 8
    Digitale Medien
    Digitale Medien
    Buchbesprechungen (1978)
    Springer
    Mathematical methods of operations research 22 (1978), S. B233 
    Details
    ISSN: 1432-5217
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01917689
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  • 9
    Digitale Medien
    Digitale Medien
    Zusammenhänge zwischen Koordination und polarographischem Verhalten unterschiedlicher Alizarin S-Chelate (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 359-361 
    Details
    ISSN: 1618-2650
    Schlagwort(e): Untersuchung von Alizarin S-Chelaten ; Polarographie ; Koordination
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Alizarin S und seine 1∶1-Metallchelate lassen sich an der Quecksilbertropfelektrode reduzieren. Aus der Beeinflussung der diffusionskontrollierten und der Adsorptionsstufe durch die Chelatbildung lassen sich Aussagen über die Konstitution und Ladung der adsorbierten Chelate machen: Beryllium wird in peri-, Aluminium und Gallium werden in ortho-Stellung des Alizarinmoleküls gebunden. Die 1∶1-Chelate des Be und Al sind ungeladen. Das Ga-Chelat ist negativ geladen und enthält offensichtlich zusätzliche anionische Liganden.
    Notizen: Abstract Alizarin Red S and its 1∶1 metal-chelates are reducible at the mercury drop electrode. From the influence of the chelate formation on the diffusion and adsorption controlled waves, statements can be made about the constitution and charge of the adsorbed chelate. Beryllium is bound in peri-, aluminium and gallium in ortho-position of the Alizarin Red S molecule. The 1∶1 chelates of Be and Al are un-charged, Ga chelate has a negative charge and contains obviously additional anionic ligands.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00561162
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  • 10
    Digitale Medien
    Digitale Medien
    Zusammenhang zwischen Chelatstabilität und Redoxpotential des Liganden bei Curcuminato-Bor-Gemischtligandenkomplexen (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 356-358 
    Details
    ISSN: 1618-2650
    Schlagwort(e): Untersuchung von Curcumin-Bor-Komplexen, Bor-Curcuminkomplexe ; Polarographie ; Stabilität, Redoxpotential
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Curcumin und Curcuminatoborchelate (B-Curc) mit verschiedenen Zweitliganden lassen sich an der Quecksilbertropfelektrode reduzieren. Die Reduktion erfolgt am enolischen C-Atom, das auch Bestandteil des Chelatringes ist. Im Gegensatz zu der bekannten negativen Potentialverschiebung bei Reduktion des Zentralatoms erfolgt bei Ligandenreduktion eine Verschiebung zu positiveren Halbstufenpotentialen mit zunehmender Stabilität der Chelate. Auf diese Weise wurden Stabilitätskonstanten einiger Gemischtliganden B-Curc-Chelate bestimmt, die mit anderen Methoden nicht erhalten werden konnten. Aus einer Adsorptionsvorstufe ließen sich Aussagen über die Konformation eines reduzierten Curcuminmoleküls im adsorbierten Zustand machen.
    Notizen: Abstract Curcumin and its different mixed ligand chelates with boron (B-Curc) can be reduced at the mercury drop electrode. The reduction takes place at the enolic C-atom, which is also a part of the chelate ring. Contrary to the known shift of potential towards negative direction concerned with the reduction of the central atom, a shift of the half wave potential towards more positive direction in connection with the reduction of the ligand has been observed. The shift is found to increase with increasing stability of the chelate. On the basis of this observation the stability constants of several mixed ligand B-Curc chelates have been determined, which cannot be obtained with the help of other known methods. From the adsorption prepeak of curcumin, it is possible to ascertain the conformation of the reduced curcumin molecule in the adsorbed state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00561161
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