This paper presents the results of a questionnaire completed by 331 UK veterinary practitioners which focused on the quality assurance of extramural studies. The questionnaire considered the attributes of practitioners as extramural teachers and the suitability of host practices for extramural studies, the students' evaluation of their quality, and the role of the veterinary schools. The questionnaire identified two broad roles for the practitioner, first, as teacher and, secondly, as professional role model, and there was strong support for students being allowed to evaluate their role as teacher. The findings are discussed in relation to aspects of good practice associated with quality assurance, and in relation to the need to develop stronger links between the schools and the veterinary profession.
586BIOCHEMICAL SOCIETY TRANSACTIONS calculated from this value and the value for k _ , calculated earlicr. This was reduced about .?-fold by both anions. These results are summarized in Table 1.Phosphate and sulphate bind t o the nucleotide site and reduce the affinity of SI for actin. The effect of phosphate and sulphate can be compared with that of ADP which reduces the affinity of S 1 for actin by a similar extent. However, whereas phosphate and sulphate reduce both K , and K,, ADP primarily affects K, 141. In addition, phosphate and sulphate induce very small changes to the rate constants compared with changes of > 20-fold t o k + , and > 1000-fold t o k + ? + k _ ? caused by ADP 141. It is clear that the reductions caused by phosphate and sulphate are produced by a different mechanism than those caused by ADP.
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