H
Hans W. Heldt
Researcher at University of Göttingen
Publications - 139
Citations - 13836
Hans W. Heldt is an academic researcher from University of Göttingen. The author has contributed to research in topics: Photosynthesis & Fructose. The author has an hindex of 69, co-authored 139 publications receiving 13498 citations. Previous affiliations of Hans W. Heldt include Ludwig Maximilian University of Munich.
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Book ChapterDOI
Metabolite levels in specific cells and subcellular compartments of plant leaves
TL;DR: The chapter describes the silicone oil centrifugation that allows chloroplasts to be separated from the remainder of the protoplast and to be quenched within 2–3 sec of disrupting the protiplast.
Journal ArticleDOI
Alkalization of the Chloroplast Stroma Caused by Light-Dependent Proton Flux Into the Thylakoid Space
TL;DR: It is discussed that the light-dependent alkalization in the chloroplast stroma may be involved in the regulation of CO2 fixation at the fructose diphosphatase step.
Journal ArticleDOI
Role of orthophosphate and other factors in the regulation of starch formation in leaves and isolated chloroplasts.
Hans W. Heldt,Chong Ja Chon,Dorothea Maronde,Alice Herold,Zivko S. Stankovic,David A. Walker,Anna Kraminer,Martha R. Kirk,Ulrich Heber +8 more
TL;DR: Starch synthesis in leaves was increased by phosphate starvation or by treatments which decreased cytoplasmic orthophosphate levels (such as mannose feeding) and it is suggested that this control is exerted via the phosphate translocator and the known allosteric regulation of ADP-glucose pyrophosphorylase.
Journal ArticleDOI
Subcellular Metabolite Levels in Spinach Leaves : Regulation of Sucrose Synthesis during Diurnal Alterations in Photosynthetic Partitioning.
TL;DR: The results provide direct evidence for the role of sucrose phosphate synthase and cytosolic fructose 1,6-bisphosphatase in regulating sucrose synthesis in leaves and also show that the phosphate translocator is kinetically limiting in vivo.
Journal ArticleDOI
The role of pH in the regulation of carbon fixation in the chloroplast stroma. Studies on CO2 fixation in the light and dark.
TL;DR: It is shown that intact chloroplasts are able to fix CO2 in the dark, yielding 3-phosphoglycerate, and demonstrates that CO2 fixation in thedark is not possible, unless the pH in the medium is artificially raised to pH 8.8.