A soft agar colony assay for Lewis lung tumour and B16 melanoma taken directly from the mouse.

A soft agar colony assay has been developed for the B16 mouse melanoma and the Lewis lung tumour. The special features of the technique are the use of a gas phase with 5% O2 instead of air and the addition of rat red blood cells. Single cell suspensions are prepared by trypsinization from the solid tumour and the cells are plated out in 0-3% agar over a layer of 0-5% agar in 30-mm Petri dishes. After 8 to 15 days' incubation in 5% O2, colonies of more than 50 cells are produced. Plating efficiencies of between 30 and 50% are usually obtained. The addition of up to 10(4) heavily irradiated tumour cells gives some further improvement in plating efficiency for the B16 melanoma but not for the Lewis lung tumour. Applications of the technique to measure cell survival in the two tumours after treatment with cytotoxic drugs and radiation are reported. The scatter of experimental points is relatively small, and in comparative experiments good agreement has been obtained with results using in vivo assay techniques

Improved immune-suppression techniques for the exongrafting of human tumours.

The transplantability of a xenografted human adenocarcinoma has been examined in mice that had been immune-suppressed by thymectomy and whole-body irradiation and the results have been compared with transplantation into athymic (nude) mice. Two alternative techniques were used to prevent marrow failure following whole-body irradiation: reconstituting the animals with a marrow graft, or protecting them by an injection of cytosine arabinoside (Ara-C) 2 days before the irradiation. The results show that the Ara-C-prepared mice were more receptive to transplantation than marrow-grafted or nude mice, and they were the only animals that developed regional metastases from implanted xenografts. Some recovery of immunity occurred in both types of immune-suppressed mice, which was evident more than 5 weeks after immune-suppression and which was more marked in females than in males. It was concluded that the immune-suppressed mice were superior to nude mice for short-term experiments but they may be less satisfactory for long-term experiments

Environmental monitoring of Mycobacterium bovis in badger feces and badger sett soil by real-time PCR, as confirmed by immunofluorescence, immunocapture, and cultivation

Real-time PCR was used to detect and quantify Mycobacterium bovis cells in naturally infected soil and badger faeces. Immunomagnetic capture, immunofluorescence and selective culture confirmed species identification and cell viability. These techniques will prove useful for monitoring M. bovis in the environment and for elucidating transmission routes between wildlife and cattle

Organisational impact of the V150 nurse prescribing qualification

An initial literature search identified a deficit in the non-medical prescribing evidence base in relation to V150 community practitioner nurse prescribing. Nineteen V150 prescribers from eight professional roles, and prescribing for a variety of conditions, along with three NMP leads, participated in this evaluation. The evaluation used a mixed methodology of questionnaires and telephone interviews; 19 V150 prescribers participated, with all of them completing the online questionnaire. Two of these also consented to a follow-up telephone interview. Three NMP leads completed the online questionnaire. The findings suggested a benefit to the wider health organisation with regard to reduced attendance at walk-in centres, GP practices and the emergency department. It is anticipated that the findings from this study may be prove useful to NMP leads, NMP groups and commissioners, as well as V150 prescribers

Consumer Panel Test of Texas Fortified Red Grapefruit Juice.

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