Abstract: A contrasting composition for gastrointestinal tract MRI which contains a trace amount of unchelated manganese is disclosed. The composition has a marked contrasting effect in MRI without causing harm to a living body.
Abstract: Whey or whey concentrate is adsorbed on an ion-exchange resin and non-protein nitrogen (NPN) is selectively desorbed by the use of whey or whey concentrate or eluent, thereby whey, whey concentrate or solution with sodium of a low content and with NPN of a high content being obtained efficiently.
Abstract: Disclosed are the plasmid pBUL1 having a restriction endonuclease cleavage map as shown in FIG. 1 and having a length of about 7.9 kbp and its derivatives.The plasmid was isolated from Lactobacillus delbrueckii subsp. bulgaricus M-878.The plasmid is useful as a vector for breeding various microorganisms such as lactic acid bacteria, and the derivatives thereof are useful also as a shuttle vector (lactic acid bacteria--Escherichia coli).