scholarly journals Nitrate Signaling and the Two Component High Affinity Uptake System in Arabidopsis

2007 ◽  
Vol 2 (4) ◽  
pp. 260-262 ◽  
Author(s):  
Mathilde Orsel ◽  
Franck Chopin ◽  
Olivier Leleu ◽  
Susan J. Smith ◽  
Anne Krapp ◽  
...  
Keyword(s):  
Uptake System ◽  
High Affinity ◽  
High Affinity Uptake ◽  
Nitrate Signaling ◽  
Two Component

scholarly journals Inactivation of Octopamine in Larval Firefly Light Organs by a High-Affinity Uptake Mechanism

1986 ◽  
Vol 122 (1) ◽  
pp. 369-385
Author(s):  
ALBERT D. CARLSON ◽  
PETER D. EVANS
Keyword(s):  
Potent Inhibitor ◽  
Nerve Terminals ◽  
Uptake System ◽  
Uptake Mechanism ◽  
High Affinity ◽  
High Affinity Uptake ◽  
Light Organs ◽  
Specific Uptake ◽  
Uptake Studies ◽  
Firefly Light

1. Uptake studies using radioactive octopamine have revealed that the larval lantern of the Photuris firefly possesses a concentrative, high-affinity uptake system for octopamine. This compound has been shown previously to be the neurotransmitter of the photomotor neurones. 2. Imipramine is a potent inhibitor of the uptake of octopamine in the lantern. At 10−1moll−4 it reduces specific uptake of radioactive octopamine with a Ki of 5.8 × 1O−1moll−1. Incubation of lanterns in 2.5 × 1O−4moll−1 imipramine induces an increase in sensitivity of the luminescent response to endogenously released and exogenously applied octopamine. Release of endogenous octopamine is potentiated in imipramine-treated lanterns, which also show a significant reduction of octopamine content with this treatment 3. Uptake of octopamine does not appear to be affected by denervation of the lanterns, suggesting that nerve terminals are not the principal sites of octopamine uptake.

A high-affinity uptake system for branched-chain amino acids inSaccharomyces cerevisiae

Yeast ◽  
1991 ◽  
Vol 7 (9) ◽  
pp. 933-941 ◽  
Author(s):  
Søren Tullin ◽  
Claes Gjermansen ◽  
Morten C. Kielland-Brandt
Keyword(s):  
Amino Acids ◽  
Branched Chain Amino Acids ◽  
Uptake System ◽  
High Affinity ◽  
High Affinity Uptake ◽  
Branched Chain
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