An experimental underwater acoustic imaging system has been
designed and built. Operating at 650 KHz, real time acoustic images
are obtainable. Using both geometrical optics and Fourier optics,
the theory of image formation and resolution is presented. Other
factors affecting image quality and system acuity are also discussed.
System components...
A great deal of research has been focused on the microbiomes of terrestrial angiosperms (flowering plants), but much less research has been performed on the microbiomes of aquatic angiosperms (Turner et al. 2013). Eelgrass beds are extremely productive ecosystems that provide habitat for many marine organisms, such as fish, shellfish,...
Manganese has been known to be essential for photosynthesis
for almost 30 years. Subsequent experimentation
indicated a definite function for manganese in oxygen evolution.
However, the mode of action of manganese and
further localization of its site of action have not been
determined.
Ten years ago it was demonstrated that...
Interactions between sediment bacteria and available phosphate
necessary for algal production in a eutrophic lake were studied.
Twenty percent of the organisms isolated solubilized phosphate forms
such as CaHPO₄, Ca₃(PO₄)₂, FePO₄, Mg₃(PO₄)₂ and Al₂(PO₄)₂.
Solubilization of phosphates occurred under conditions of aerobic
growth.
Upon quantitative analysis, some isolates were capable...
Saccharomyces cerevisiae strain XS-380, a. heteroallelic
diploid strain, carries six genetically analyzed loci on the left arm of
chromosome VII. Nitrosoguanidine (NMG) at low concentrations was
observed to cause allelic recombination (either mitotic recombination
or gene conversion) of the heteroallelic loci with low lethality.
The NMG-inducible heteroallelic system was used...
