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Potassium persulfate can be prepared by electrolysis of a cold solution potassium bisulfate in sulfuric acid at a high current density. [1] [4]2 KHSO 4 → K 2 S 2 O 8 + H 2. It can also be prepared by adding potassium bisulfate (KHSO 4) to a solution of the more soluble salt ammonium peroxydisulfate (NH 4) 2 S 2 O 8.
A Serological pipette is designed for use as a blow-out pipette. A Serological pipette also has graduation marks, which start nearer the end of the tip. The pipette can be blown out by gravitational force or air pressure. Rubber bulbs attached to the end opposite the tip are commonly used to "blow out" any remaining solution.
(These are for Class A pipettes; Class B pipettes are given a tolerance of twice that for the corresponding Class A.) A specialized example of a volumetric pipette is the microfluid pipette (capable of dispensing as little as 10 μL) designed with a circulating liquid tip that generates a self-confining volume in front of its outlet channels. [3]
In developmental, cell and molecular biology, trituration is the process of fragmenting of solid material (often biological tissue or aggregated material) into smaller components (often, respectively, cells or molecules in suspension/solution) by means of repeated passage through a pipette.
In 1999, Johnson & Johnson had signed a contract with a company called Excerpta Medica. Its specialty was medical marketing. Its sub-specialty was producing ghostwritten, data-filled studies on the efficacy and safety of a client’s drugs, finding the right academic scholars to be listed as the authors and then placing the articles in prestigious academic journals.
Positive displacement pipettes are a type of pipette that operates via piston-driven displacement. [1] [2] Unlike an air displacement pipette, which dispenses liquid using an air cushion in the pipette tip, the piston in a positive displacement pipette makes direct contact with the sample, allowing the aspiration force to remain constant.
the application. To the extent possible, data in the summary should be presented in tabular and graphic forms. FDA has prepared a guideline under 10.90(b) that provides information about how to prepare a summary. The summary required under this paragraph may be used by FDA