Single V promotional videos from a varying span of time, alternate versions of the videos, often featured on the Single V that the video originally came from, and the TV spots for the singles. Although Hello! Project singles are usually accompanied by a Single V, frequently when a single is released near the same time that a Single V Clips is released, the single will not have a regular Single V. Instead, the promotional video and alternate shots of the video will appear on the Single V Clips. But no one knows what the "V" or "M" actually means. Single V A
Single-use bioreactor conventional bioreactors. Instead of a culture vessel made from stainless steel or glass, a single-use bioreactor is equipped with a disposable bag. The disposable bag is usually made of a three-layer plastic foil. One layer is made from Polyethylene terephthalate or LDPE to provide mechanical stability. A second layer made using PVA or PVC acts as a gas barrier. Finally, a contact layer is made from PVA or PP. For medical applications the single-use materials that contact the product must be certified by the European Medicines Agency or similar authorities responsible for other regions. In general there are two different