What are examples of phytoplankton?
Some examples of phytoplankton include diatoms, green algae, cyanobacteria, and coccolithophores, among others.
What is the meaning by PI in photosynthesis?
photosynthesis-irradiance
The PI (or photosynthesis-irradiance) curve is a graphical representation of the empirical relationship between solar irradiance and photosynthesis. A derivation of the Michaelis–Menten curve, it shows the generally positive correlation between light intensity and photosynthetic rate.
Which chemical species best encourages the growth of phytoplankton?
Phytoplankton growth depends on the availability of carbon dioxide, sunlight, and nutrients. Phytoplankton, like land plants, require nutrients such as nitrate, phosphate, silicate, and calcium at various levels depending on the species.
Is algae a type of plankton?
Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries.
What does pi mean in biology?
Inorganic phosphate (Pi) is an essential nutrient to living organisms. It plays a key role in diverse biological processes, including osteoblast differentiation and skeletal mineralization.
What is Pi in molecular biology?
The isoelectric point (pI, pH(I), IEP), is the pH at which a molecule carries no net electrical charge or is electrically neutral in the statistical mean. The standard nomenclature to represent the isoelectric point is pH(I).
What are the most common phytoplankton species?
Diatoms are the most common type of phytoplankton. They are single-celled yellow algae whose cell walls contain a lot of silica, glass-like substance.
How many species of phytoplankton are there?
There are more than 20,000 species of phytoplankton distributed among eight major taxonomic groups. They range in size from less than 1 µm to greater than 100 µm. The distinct phytoplankton groups have different primary functions in the ecosystem.
What is the significance of isoelectric point?
The isoelectric point is significant in protein purification because it represents the pH where solubility is typically minimal. Here, the protein isoelectric point signifies where mobility in an electro-focusing system is zero—and, in turn, the point where the protein will collect.
What does isoelectric point tell you?
The isoelectric point (pI) is the pH value at which the molecule carries no electrical charge. The concept is particularly important for zwitterionic molecules such as amino acids, peptides, and proteins. For an amino acid, the isoelectric point is the average of pKa values for the amine and the carboxyl group.
What does a high isoelectric point mean?
The isoelectric point (pI) is the pH of a solution at which the net charge of a protein becomes zero. At solution pH that is above the pI, the surface of the protein is predominantly negatively charged, and therefore like-charged molecules will exhibit repulsive forces.
What are phytoplankton species?
Phytoplankton are microscopic marine algae. Phytoplankton, also known as microalgae, are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow. Most phytoplankton are buoyant and float in the upper part of the ocean, where sunlight penetrates the water.
What does a low isoelectric point mean?
A protein that is in a pH region below its isoelectric point (pI) will be positively charged and so will migrate towards the cathode. As it migrates, however, the charge will decrease until the protein reaches the pH region that corresponds to its pI. At this point it has no net charge and so migration ceases.
What is the pI of a protein and what does it indicate?
The isoelectric point, or pI of the protein is the pH value at which the total charge on the protein is zero. At this pH value the negative and positive charges of the protein are equal and the protein is at neutral charge.
Does light intensity affect the fitting curves of phytoplankton?
The fitting curves by model 4 for P. subcordiformis, M. aeruginosa, M. wesenbergii, and Chlorococcum sp. exhibited some deviations under low intensity of irradiance, likely because the model targeted higher plants, which showed higher light dependence than phytoplankton.
What is the ratio of n p in phytoplankton?
Survivalist phytoplankton has high ratio of N:P (>30) and contains numerous resource-acquisition machinery to sustain growth under scarce resources. Bloomer phytoplankton has low N:P ratio (<10), contains high proportion of growth machinery and adapted to exponential growth.
What is the phytoplankton identification key?
An annotated key to the identification of commonly occurring and dominant genera of Algae observed in the Phytoplankton of the United States. Washington, D.C.: United States Government Printing Office.
What is the PI curve in photosynthesis?
The PI curve can be applied to terrestrial and marine reactions but is most commonly used to explain ocean-dwelling phytoplankton’s photosynthetic response to changes in light intensity.