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1Author    R. Kanne, H. ZähnerRequires cookie*
 Title    Concentrations of W ild -T y p e and a Macrotetrolide Negative Mutant of Streptomyces griseus  
 Abstract    The studied macrotetrolide negative mutant of Streptomyces griseus showed a different spe­ cificity of potassium accumulation than the macrotetrolide producing wild-type, indicating, that the macrotetrolides may be part of the physiological potassium carrier. 
  Reference    (Z. Naturforsch. 31c, 115 [1976]; received November 3 1975) 
  Published    1976 
  Keywords    Potassium Sodium, Ionophores, Antibiotics, Transport 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0115.pdf 
 Identifier    ZNC-1976-31c-0115 
 Volume    31 
2Author    R. Einhard KanneRequires cookie*
 Title    Isolation and Characterization of a Potassium Specific Ionophore from Streptococcus fuecalis  
 Abstract    The synthesis of a potassium and rubidium specific ionophore by S treptococcu s faecalis has been proved, using bilayer measurements. The characteristics of this substance agree with the ones, published for free mobile carriers, such as valinomycin and the macrotetrolides. 
  Reference    (Z. Naturforsch. 32c, 926 [1977]; received August 24 1977) 
  Published    1977 
  Keywords    Potassium, Ionophores, Transport, Antibiotics, Black Lipid Membranes 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0926.pdf 
 Identifier    ZNC-1977-32c-0926 
 Volume    32 
3Author    G. Inesi, M. Kurzmack, D. Kosk-Kosicka, D. Lewis, H. Scofano, H. G. Uim Araes-MottaRequires cookie*
 Title    Equilibrium and Kinetic Studies of Calcium Transport and ATPase Activity in Sarcoplasmic Reticulum  
 Abstract    A number o f equilibrium and kinetic m easurem ents are presented to characterize the partial reactions o f the ATPase and transport cycle in sarcoplasm ic reticulum vesicles. The cycle begins with calcium and nucleotide binding on sites available on the outer surface o f the vesicles. A phosphorylated enzyme intermediate is then formed, and the calcium sites are subjected to a change in their orientation and their affinity for calcium . It is shown that steps involved in cal­ cium release on the inner side o f the vesicles are rate lim iting for the cycle, and are follow ed by hydrolytic cleavage o f the intermediate with release o f inorganic phosphate and recycling o f the enzyme. 
  Reference    Z. Naturforsch. 37c, 685 (1982); received February 6 /M arch 23 1982 
  Published    1982 
  Keywords    Calcium, Transport, ATPase, Sarcoplasm ic Reticulum 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0685.pdf 
 Identifier    ZNC-1982-37c-0685 
 Volume    37 
4Author    KarlSiegfried Boos, Eckhard Schlimme, Paderborn, Morio IkeharaRequires cookie*
 Title    Conformationally Restricted Adenine Nucleotide Analogs in Mitochondrial Adenine Nucleotide Transport  
 Abstract    The conform ationally restricted adenine nucleotide analogs 8,3'anhydro-8-oxy-9-(/?-D-xylofurano-syl) adenine-5'-0-tri (d i) -phosphate (I) , and 8,2'-anhydro-8-oxy-9-(/5-D-arabinofuranosyl) adenine-5'-0-tri (di)-phosphate (II), were prepared chemically as their a-32P-labelled compounds and compared with syn-structured 8-bromo A T (D) P in mitochondrial adenine nucleotide translocation. The experimental findings demonstrate that the heterocycle-ribose orientation affects the carrier mediated adenine nucleotide transport very strongly, anti region is prerequisite for the bound nucleotide nucleotide carrier. 
  Reference    Z. Naturforsch. 33c, 552 (1978); received March 23/May 3 1978 
  Published    1978 
  Keywords    Conform ationally Restricted Adenine Nucleotides, Mitochondria, Adenine Nuclcotide Carrier, Translocation, Transport 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0552.pdf 
 Identifier    ZNC-1978-33c-0552 
 Volume    33 
5Author    Wolfram Hartung, Barbara DierichRequires cookie*
 Title    Uptake and Release of Abscisic Acid by Runner Bean Root Tip Segments  
 Abstract    Uptake o f abscisic acid by 5 mm long decapped root tips is a linear function o f the external ABA concentration in the range o f 2.9 x 10-8 m to 10~4 m and decreases dramatically with in­ creasing pH. At pH 8.0 uptake rate is extremely low, even at high ABA concentrations. This indicated that nearly all o f the ABA is taken up as the undissociated m olecule ABAH. Uptake o f ABA is influenced by agents m odifying the pH gradients between the m edium and the tissue such as salts o f weak acids incubated at low external pH (inhibition o f uptake and stim ulation o f ABA release by abolishing the pH gradients), protonophores such as CCCP (inhibition o f uptake) and fusicoccin (stim ulation o f uptake by increasing the pH between m edium and cytoplasm). It is concluded that ABA distributes between the compartments o f the root cells according to the pH gradients with the undissociated m olecule as the only penetrating species. Uptake and release occur without participation o f a saturable com ponent by diffusion. In contrast IAA permeates the plasm alem m a as both IAAH and IAA-. 
  Reference    Z. Naturforsch. 38c, 719 (1983); received March 31 1983 
  Published    1983 
  Keywords    Abscisic Acid, Diffusion, Indole Acetic Acid, Phaseolus coccineus, Plasm alem m a, Transport 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0719.pdf 
 Identifier    ZNC-1983-38c-0719 
 Volume    38