The effect of radioactive radiations upon euglena

An examination has been made of the rate of death of euglena cells when exposed to the alpha particle radiation from radium emanation dissolved in the containing liquid. It was found that the rate of death of the cells was pro. portional to the strength of the dissolved emanation and to the number of live euglena cells present, a conclusion in harmony with the view that death of a cell is caused by a single impact of some sensitive region with an alpha particle. The theory of the case where two impacts of the sensitive region with an alpha particle are necessary to cause death, has been worked out with a generality which allows for a recovery of the cells between the two impacts.It is found that the results of the experiment are inconsistent with such a hypothesis.From the experimental data, it is possible to calculate the size of the sensitive entity which when struck by the alpha particle causes death to the cell. The diameter of this entity comes out about equal to that of the nucleus of the euglena cell.     

The relational value of professional dialogue for academics pursuing HEA fellowship

The question of how academics in higher education institutions demonstrate they have the ability to teach and provide a high quality learning experience challenges the sector. Within this context, the use of professional dialogue for recognising teaching expertise is growing. This qualitative research explored how 16 academics valued their engagement in professional dialogue, and its impact as a developmental opportunity. The findings underline the importance of the relational and social aspects and value of this type of professional learning.