Jonathan R. Ramsay

Learn More
Four Mycoplasma arthritidis strains were examined for differences in virulence for LEW rats and elicitation of antibody responses in the immunoglobulin (Ig) M and G classes and in the four IgG subclasses. Two strains were highly arthritogenic and two were relatively avirulent. When the latter strains did induce arthritis, it was significantly less severe (P(More)
The Mycoplasma arthritidis antigen(s) responsible for eliciting metabolism-inhibiting antibodies in rabbits has been partially characterized. Metabolism-inhibiting activity was absorbed from rabbit antisera by intact M. arthritidis cells and membranes but much less so by the soluble cytoplasmic fraction, indicating that the antigen is located on the outer(More)
Sera from rats convalescing from infection with Mycoplasma arthritidis were tested for their ability to react with M. arthritidis membrane antigens by immunoblotting and radioimmunoprecipitation. The absence of metabolism-inhibition (MI) antibody activity in these sera suggested that rats might fail to recognize those membrane antigens involved in eliciting(More)
A rapid, enzymatic assay for serum or plasma paracetamol has been developed with the potential for adaptation to a wide range of clinical analysers. The method involves the action of an amidase enzyme to produce 4-aminophenol from paracetamol, which in turn reacts with 8-hydroxyquinoline in the presence of manganese ions to form a blue dye. Two stable(More)
Salicylate monooxygenase (EC: 1.14.13.1) has been produced and purified from Pseudomonas cepacia ATCC 29351 which has the ability to utilise salicylate as a sole carbon source. The bacterium was grown on a defined medium containing 2% (w/v) casamino acids and 0.15% (w/v) yeast extract at 25 degrees C; salicylate monooxygenase production was induced by the(More)
The antileukemia enzyme, Erwinia L-asparaginase, occurs as a tetramer which can be dissociated by the stresses of lyophilization into four subunits (subunit M(r) 34 000 Da). Dissociation can be reduced by adding protectants to the formulation to stabilize the biopolymer, while the product should dry to form a pharmaceutically elegant, shelf-stable cake(More)
The transplantability of experimental tumors into the brain (i.e.) and s.c. tissues of C3Hf/Sed and athymic NCr/Sed nude mice was examined using quantitative cell transplantation assays. Studies using the immune-competent Oil animals showed that brain is a more favorable site for the transplantation of syngeneic tumor than s.c. tissue and that this is true(More)
This salicylate-specific assay can be adapted for use with most discrete analyzers, for rapid emergency or routine testing with small serum or plasma sample volumes and a single calibration. The basis of this method is as follows: salicylate monooxygenase (EC 1.14.13.1) converts salicylate to catechol in the presence of NADH; the catechol then reacts with(More)