Membranes â¢ Provide barrier function â Extracellular â Organelles â¢ Barrier can be overcome by âtransport proteinsâ â To mediate transmembrane movements of ions, Na + , K + â Nutrients, glucose, amino acids etc. â Water (aquaporins).
Boron is a chemical element with symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in the Solar system and in the Earth's crust.
Boron is classified as a metalloid with brown color. Its atomic number is 5, so it has a total of five electrons revolving around the nucleus. It has six neutrons and five protons in the nucleus. The atomic weight of boron is 10.811 grams per mole. Boron has a high melting point of 3,767 degrees Fahrenheit and a boiling point of 7,232 degrees Fahrenheit.