On the use of quality factors and fluence to dose rate conversion in human radiation exposures

It is shown that various combinations of numbers and factors arrive at estimates of dose and dose effectiveness from values of fluence; but as yet it has not been possible to use biological data with the same degree of precision to estimate the physical data. It would seem that the most reasonable way to use the human data that exist is to apply them as far as possible to the human animal as a whole

Protecting effects specifically from low doses of ionizing radiation to mammalian cells challenge the concept of linearity

This report examines the origin of tissue effects that may follow from different cellular responses to low-dose irradiation, using published data. Two principal categories of cellular responses are considered. One response category relates to the probability of radiation-induced DNA damage. The other category consists of low-dose induced changes in intracellular signaling that induce mechanisms of DNA damage control different from those operating at high levels of exposure. Modeled in this way, tissue is treated as a complex adaptive system. The interaction of the various cellular responses results in a net tissue dose-effect relation that is likely to deviate from linearity in the low-dose region. This suggests that the LNT hypothesis should be reexamined. The aim of this paper is to demonstrate that by use of microdosimetric concepts, the energy deposited in cell mass can be related to the occurrence of cellular responses, both damaging and defensive

Low doses of ionizing radiation to mammalian cells may rather control than cause DNA damage

This report examines the origin of tissue effects that may follow from different cellular responses to low-dose irradiation, using published data. Two principal categories of cellular responses are considered. One response category relates to the probability of radiation-induced DNA damage. The other category consists of low-dose induced metabolic changes that induce mechanisms of DNA damage mitigation, which do not operate at high levels of exposure. Modeled in this way, tissue is treated as a complex adaptive system. The interaction of the various cellular responses results in a net tissue dose-effect relation that is likely to deviate from linearity in the low-dose region. This suggests that the LNT hypothesis should be reexamined. This paper aims at demonstrating tissue effects as an expression of cellular responses, both damaging and defensive, in relation to the energy deposited in cell mass, by use of microdosimetric concepts

Re-examining Paul Broca’s initial presentation of M. Leborgne: understanding the impetus for brain and language research

The 150th anniversary affords an opportunity to revisit the circumstances surrounding Paul Broca’s case report celebrated today as the moment of discovery of aphasia. The proceedings from January to June 1861 of the Paris Society of Anthropology are examined to reconstruct the events surrounding the report of M. Leborgne on April 18th. From a close reading of the presentations and discussions which took place during this period it is apparent that Broca’s case report was a minor diversion to a debate about cranial measurements and their relation to intelligence in individuals and racial groups. Moreover, it appears that little attention was granted to Broca’s first case at the time. While his ideas about localization and specialization developed and change over the next decade, it represented a minor field of interest for him. Nevertheless Broca’s work on aphasia inspired research throughout Europe and North America and went on to have a lasting impact on both aphasiology and neuropsychology

Foreign rule?: transnational, national, and local perspectives on Venice and Venetia within the “multinational” empire

The history of the Habsburg Empire in the post-Napoleonic era is frequently approached from the perspective of its various component nationalities. These were traditionally portrayed in the historiography as engaged in more-or-less open struggle with control from Vienna. This article argues that the over-privileging of such national categories can distort the picture. By looking at a number of case studies – the naming of Lombardy-Venetia, the Biblioteca italiana, the Panteon veneto – the relationship between Venice (and its Terraferma) and Habsburg rule during the second Austrian domination is examined. It will be argued that it is more profitable to see Venetian identities (municipal, local, Italian, and as part of a wider transnational European culture) as capable of working for as well as against the empire, and that Habsburg policy was as often concerned with managing potential local rivalries (notably between Lombards and Venetians) as with controlling a perceived Italian threat. It is also suggested that, while cultivation of local identity was often used to reinforce the national, the Austrian authorities were also happy to annex both to further imperial interests

Strategic Culture and Ways of War

vii.152 hal.;23 c