Post-flight, following exposure to microgravity, the vestibular system, located in the inner ear is disrupted because of the microgravity-induced unresponsiveness of the otoliths which are small calcareous concretions that sense body postures and are responsible for ensuring proper balance.
12.
Although most bivalves can create pearls, oysters in the family Pteriidae and freshwater mussels in the families Unionidae and Margaritiferidae are the main source of commercially available pearls because the calcareous concretions produced by most other species have no lustre.
13.
It has painted vanitas scenes on the front and drawers containing bezoars, or calcareous concretions from the stomachs of Persian goats, as well as musk pouches, cups of lignum Guaiacum and curiosities like gloves with no openings for the hands, fake fruit and pictures that came into focus only when viewed through special mirrors.
