|
(詳細はteat pipette. Pasteur pipettes come in various lengths and are sold in boxes of hundreds. They are named after the French scientist Louis Pasteur, who was known to have used a variant of them extensively during his research. Generally, they are considered cheap enough to be disposable, however, so long as the glass point is not chipped, the Pasteur pipette may be washed and reused indefinitely. The name eye dropper also may refer to early models of fountain-pens, which have to be refilled with some kind of Pasteur pipette. ==Plastic Pasteur pipettes== Plastic Pasteur pipettes, also referred to as transfer pipettes, have their stems and bulbs in the form of a single piece made of plastic. There are different sizes. The volumes are usually marked on the stem, though the markings are rather crude and are not particularly accurate. Plastic Pasteur pipettes are often used in biology where most media are aqueous, and solvent resistance is not important. Most organic solvents, such as hexane and acetone, cannot be used in plastic Pasteur pipettes. They dissolve the plastic in these instruments, rendering them inadequate for many types of applications. The pipettes are also hard to wash, and are usually discarded with other biohazard waste after each use. Plastic bulb pipettes are generally not precise enough to be used for exact measurements, whereas their glass counterparts can be extremely precise. The longer and thinner the tip of a glass pipette, the more exact the measurement. Usually they will be used in conjunction with a scale. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pasteur pipette」の詳細全文を読む スポンサード リンク
|