Pro Anees Qadri| Black Magic | Free Online Istikhara For Get Ex Back | Business Problem | Istikhara Ka Tarika | Istikhara For Shadi | Istikhara In Islam | Istikhara For Nikah Marriage | Dua Istikhara With Urdu | Istikhara Ki Dua |Contact No :+92-309-0404656
محبوب کو تابع کرنا،من پسند شادی، کاروباری بندش، روحانی علاج، دشمن کو زیر کرنا، ساس بہو کا جھگڑا، محبوب کی بے رخی پردہ دار بہنیں گھر بیٹھ کراپنا مسلےکا حل کروا سکتی ہیں بس ایک فون کال پروفیسر انیس قادری

Pearl

AKOYA PEARL

Pearls are formed inside the shell of certain mollusks as a defense mechanism against a potentially threatening irritant such as a parasite inside the shell, or an attack from outside that injures the mantle tissue. The mollusk creates a pearl sac to seal off the irritation. Pearls are thus the result of an immune response analogous in the human body to the capture of an antigen by a phagocyte (phagocytosis).

Akoya Pearl The mollusk’s mantle (protective membrane) deposits layers of calcium carbonate (CaCO3) in the form of the mineral aragonite or a mixture of aragonite and calcite (polymorphs with the same chemical formula, but different crystal structures) held together by an organic horn-like compound called conchiolin. Akoya Pearl The combination of aragonite and conchiolin is called nacre, which makes up mother-of-pearl. The commonly held belief that a grain of sand acts as the irritant is in fact rarely the case. Typical stimuli include organic material, parasites, or even damage that displaces mantle tissue to another part of the mollusk’s body. These small particles or organisms gain entry when the shell valves are open for feeding or respiration. In cultured pearls, the irritant is typically an introduced piece of the mantle epithelium, with or without a spherical bead (beaded or beadles’ cultured pearls).

About Admin

Check Also

Psand ki shadi ke lye dua

Psand ki shadi ke lye dua Psand ki shadi ke lye dua Dua hajat Psand …

Leave a Reply

Your email address will not be published. Required fields are marked *