calcium
钙,钙质,钙剂,钙片
Definitions
- 1
Chemistry, Biology.
- : a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions. Symbol: Ca; atomic weight: 40.08; atomic number: 20; specific gravity: 1.55 at 20°C.
Examples
Inside that hunk of cheddar, calcium binds long protein strands called caseins into a type of web, and water and fat molecules occupy the space between those interconnected threads.
According to the project’s website, calcium carbonate has “near-ideal optical properties.”
Nutritionally, roots have a lot to offer, too, with carrots particularly high in vitamin A, and others rich in vitamin C, potassium, fiber, calcium and magnesium, to mention a few highlights.
That DNA contained instructions to make a protein that would glow when calcium levels surged inside the cell — a technique called calcium imaging.
The females use that calcium to form the hard shells of their eggs.
I take calcium and vitamin D supplements, but prescription medications are generally only for women in menopause.
Fat-free or skim milkEveryone knows milk is an excellent source of calcium that will keep your bones in tip-top shape.
Feel good about using cottage cheese as a dip because it delivers calcium, quality protein and potassium.
The rhino beetle—fried, stewed, grilled, or roasted—is high in calcium and protein.
Excess calcium causing zinc and iron deficiency offers just one simple illustration of this kind of interaction.
Crystals of calcium oxalate are insoluble in acetic acid or caustic soda.
The long axis of the hip-roof crystal is often so shortened that it resembles the envelop crystal of calcium oxalate.
The usual forms are: (a) Ammoniomagnesium phosphate crystals; (b) acid calcium phosphate crystals; and (c) amorphous phosphates.
Characteristic octahedral crystals of calcium oxalate (Fig. 47) appear after ingestion of certain vegetables.
The lights were lowered, a single calcium playing with its soft and silvery rays upon his face and shoulders.