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The γ-amylase has the most acidic optimum pH of all amylases because it is most active around pH 3. They belong to a variety of different glycoside hydrolase families, such as glycoside hydrolase family 15 in fungi, glycoside hydrolase family 31 of human MGAM , and glycoside hydrolase family 97 of bacterial forms.
Saliva on a baby's lips. Saliva (commonly referred to as spit or drool) is an extracellular fluid produced and secreted by salivary glands in the mouth.In humans, saliva is around 99% water, plus electrolytes, mucus, white blood cells, epithelial cells (from which DNA can be extracted), enzymes (such as lipase and amylase), and antimicrobial agents (such as secretory IgA, and lysozymes).
Cells adjust their pH i accordingly upon an increase in acidity or basicity, usually with the help of CO 2 or HCO 3 – sensors present in the membrane of the cell. [3] These sensors can permit H+ to pass through the cell membrane accordingly, allowing for pH i to be interrelated with extracellular pH in this respect. [12]
α-Amylase is an enzyme (EC 3.2.1.1; systematic name 4-α-D-glucan glucanohydrolase) that hydrolyses α bonds of large, α-linked polysaccharides, such as starch and glycogen, yielding shorter chains thereof, dextrins, and maltose, through the following biochemical process: [2]
Malassezia globosa, a fungus thought to be the cause of human dandruff, uses lipase to break down sebum into oleic acid and increase skin cell production, causing dandruff. [14] Genes encoding lipases are even present in certain viruses. [15] [16] Some lipases are expressed and secreted by pathogenic organisms during an infection.
Saliva consists of mucus and serous fluid; the serous fluid contains the enzyme amylase, which is important for the digestion of carbohydrates. Minor salivary glands of von Ebner present on the tongue secrete the lipase. The parotid gland produces purely serous saliva. The other major salivary glands produce mixed (serous and mucus) saliva.
Reference ranges for blood tests, showing acid phosphatase in red at left. Acid phosphatase catalyzes the following reaction at an optimal acidic pH (below 7): a phosphate monoester + H 2 O = an alcohol + phosphate. Phosphatase enzymes are also used by soil microorganisms to access organically bound phosphate nutrients.
An acid-base diagram for human plasma, showing the effects on the plasma pH when P CO 2 in mmHg or Standard Base Excess (SBE) occur in excess or are deficient in the plasma [23] Acid–base imbalance occurs when a significant insult causes the blood pH to shift out of the normal range (7.32 to 7.42 [16]).