O
Olaf Ninnemann
Researcher at Humboldt State University
Publications - 21
Citations - 2173
Olaf Ninnemann is an academic researcher from Humboldt State University. The author has contributed to research in topics: Hippocampal formation & Dentate gyrus. The author has an hindex of 17, co-authored 20 publications receiving 2034 citations.
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Journal ArticleDOI
Three Functional Transporters for Constitutive, Diurnally Regulated, and Starvation-Induced Uptake of Ammonium into Arabidopsis Roots
Sonia Gazzarrini,Laurence Lejay,Alain Gojon,Olaf Ninnemann,Wolf B. Frommer,Nicolaus von Wirén +5 more
TL;DR: The results show that high-affinity ammonium uptake in roots is regulated in relation to the physiological status of the plant at the transcriptional level and by substrate affinities of individual members of the AMT1 gene family.
Journal ArticleDOI
Identification of a high affinity NH4+ transporter from plants.
TL;DR: Evidence is provided that a gene for the plant high affinity NH4+ uptake has been identified and sequence homologies to genes of bacterial and animal origin indicate that this type of transporter is conserved over a broad range of organisms.
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Preferential expression of an ammonium transporter and of two putative nitrate transporters in root hairs of tomato
TL;DR: Root hair specificity and characteristics of substrate regulation suggest an important role of the three genes in uptake of mineral nitrogen in plant uptake systems for mineral nitrogen.
Journal ArticleDOI
Differential regulation of three functional ammonium transporter genes by nitrogen in root hairs and by light in leaves of tomato.
N. von Wirén,Frank-Roman Lauter,Olaf Ninnemann,Bernd Gillissen,Pia Walch-Liu,Christof Engels,W. Jost,Wolf B. Frommer +7 more
TL;DR: Results indicate that in tomato at least two high-affinity NH4+ transporters, LeAMT1;1 and LeAMt1;2, are differentially regulated by N and contribute to root hair-mediated NH4 + acquisition from the rhizosphere.
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Selenium deficiency increases susceptibility to glutamate-induced excitotoxicity
Nicolai E. Savaskan,Anja U. Bräuer,M. Kühbacher,Ilker Y. Eyüpoglu,Ilker Y. Eyüpoglu,Antonios Kyriakopoulos,Olaf Ninnemann,Dietrich Behne,Robert Nitsch +8 more
TL;DR: Evidence that selenium deficiency in vivo results in a massive increase in susceptibility to kainate‐induced seizures and cell loss is provided and indicates the importance of seenium for prevention and therapy of excitotoxic brain damage.