If healthy, pest-free fruit are on the ground, they are probably ripe. Stems prepare to separate. When an apple or pear is ready to pick, the stem swells and creates a weak point that will separate from the branch when the apple is lifted. If the apple is not ready, the stem will bend and the fruit will not separate.
anÂ·aÂ·lyte. (an'Ä-lÄ«t) A material or substance the presence or concentration of which in a specimen is determined by analysis. analyte. a substance or material to be analyzed; a molecule to be analyzed by mass spectrometry.
Ion Definition An ion is defined as an atom or molecule which has gained or lost one or more of its valence electrons, giving it a net positive or negative electrical charge. In other words, there is an imbalance in the number of protons (positively charged particles) and electrons (negatively charged particles) in a chemical species.