Motion of diatom chains in steady shear flow
Article Abstract:
Diatom chain motion in steady shear flow is discussed. Two chain-forming diatoms, Skeletonema costatum and Thalassiosirea nordenskioldii have been studied in such flow with consideration of theory for elongated, rigid spheroids, and both species showed predictable periodic rotation. The rotation of T. nordenskioldii was more similar to motion of flexible fibers in engineering applications. It appears that fluxes of nutrients and collision frequencies vary a lot with detailed shapes and mechanical properties of chains and unit cells.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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Interactions among Cu2+, Zn2+, and Mn2+ in controlling cellular Mn, Zn, and growth rate in the coastal alga Chlamydomonas
Article Abstract:
The toxic metals (Cu and Zn) interact antagonistically with the nutrient metals (Zn and Mn) in the regulation of cellular Mn and Zn uptake and specific growth rate of Chlamydomonas sp. in metal ion-buffered media. Mn uptake is inhibited by Zn, while Zn uptake is inhibited by high levels of Cu2+. Uptake of Zn was complex, apparently involving a high-affinity Zn system when Zn2+ is low, as well as a separate low-affinity system and the Mn system.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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