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Similar to other marine photosynthesizing organisms like phytoplankton, seaweeds also experience nutrient limitations impacting their ability to grow. [4] [46] [49] Nitrogen is the most commonly found limiting nutrient for seaweed photosynthesis, although phosphorus has also been found to be limiting. [46]
In the U.K., fertilizer labeling regulations allow for reporting the elemental mass fractions of phosphorus and potassium.The regulations stipulate that this should be done in parentheses after the standard N-P-K values, as in "15-30-15 (15-13-13)".
Redfield’s analysis of the empirical data led to him to discover that across and within the three oceans and Barents Sea, seawater had an N:P atomic ratio near 20:1 (later corrected to 16:1), and was very similar to the average N:P of phytoplankton. To explain this phenomenon, Redfield initially proposed two mutually non-exclusive mechanisms:
A substance in the feed, such as a nutrient or toxin, can be referred to on a dry matter basis (abbreviated DMB) to show its level in the feed (e.g., ppm). Considering nutrient levels in different feeds on a dry matter basis (rather than an as-is basis) makes a comparison easier because feeds contain different percentages of water.
In subtropical gyres, and more generally in areas with low nutrient availability, phytoplankton communities are generally dominated by picoplankton (cells between 0.2 and 2μm). [28] Picoplankton are smaller than other plankton that dominate higher nutrient regions, and their small volume means they have a larger surface area to volume ratio.
Baseball Hall of Famer Wade Boggs announced some good news on Friday, with the former Boston Red Sox, New York Yankees, and Tampa Bay Devil Rays star confirming he's "cancer free.". Boggs, 66 ...
Some people were judgmental when I had my second child at the age of 44. I love being an older mom. My husband and I had kids at the right time for us.
The Monod equation is a mathematical model for the growth of microorganisms. It is named for Jacques Monod (1910–1976, a French biochemist, Nobel Prize in Physiology or Medicine in 1965), who proposed using an equation of this form to relate microbial growth rates in an aqueous environment to the concentration of a limiting nutrient.