Changes to the Fossil Record of Insects through Fifteen Years of Discovery

The first and last occurrences of hexapod families in the fossil record are compiled from publications up to end-2009. The major features of these data are compared with those of previous datasets (1993 and 1994). About a third of families (>400) are new to the fossil record since 1994, over half of the earlier, existing families have experienced changes in their known stratigraphic range and only about ten percent have unchanged ranges. Despite these significant additions to knowledge, the broad pattern of described richness through time remains similar, with described richness increasing steadily through geological history and a shift in dominant taxa, from Palaeoptera and Polyneoptera to Paraneoptera and Holometabola, after the Palaeozoic. However, after detrending, described richness is not well correlated with the earlier datasets, indicating significant changes in shorter-term patterns. There is reduced Palaeozoic richness, peaking at a different time, and a less pronounced Permian decline. A pronounced Triassic peak and decline is shown, and the plateau from the mid Early Cretaceous to the end of the period remains, albeit at substantially higher richness compared to earlier datasets. Origination and extinction rates are broadly similar to before, with a broad decline in both through time but episodic peaks, including end-Permian turnover. Origination more consistently exceeds extinction compared to previous datasets and exceptions are mainly in the Palaeozoic. These changes suggest that some inferences about causal mechanisms in insect macroevolution are likely to differ as well

Epidemiology and control of trachoma: systematic review.

Trachoma is the commonest infectious cause of blindness. Recurrent episodes of infection with serovars A-C of Chlamydia trachomatis cause conjunctival inflammation in children who go on to develop scarring and blindness as adults. It was estimated that in 2002 at least 1.3 million people were blind from trachoma, and currently 40 million people are thought to have active disease and 8.2 million to have trichiasis. The disease is largely found in poor, rural communities in developing countries, particularly in sub-Saharan Africa. The WHO promotes trachoma control through a multifaceted approach involving surgery, mass antibiotic distribution, encouraging facial cleanliness and environmental improvements. This has been associated with significant reductions in the prevalence of active disease over the past 20 years, but there remain a large number of people with trichiasis who are at risk of blindness

Knowledge at play. Studies of games as members’ matters

On a general level, this thesis seeks some answers to the broad question of what one can learn from digital games. With an analytical approach informed by ethnomethodology, the main thrust of the work is an exploration of members’ matters in the area of games and gaming. In response to prevailing discussions about how, where and what gamers learn, the aim is to examine emerging forms of knowledge embedded in practices in and around digital games. The first part of the thesis addresses three themes: the question of whether leisure gaming could be understood to have transfer effects; how games are positioned in a state of restlessness and multistableness; and how the domain encompassing gaming and game development is advancing in terms of professionalization and institutionalization. The second part is comprised of three empirical studies based on two sets of video recordings: collaborative gaming in The Lord of the Rings Online, and assessment practices in game development education. The studies begin to unravel the elusive phenomena of gaming by making some gameplay practices and conventions visible. For instance, the findings suggest that there are specialized coordination practices, developed through long-term engagement with the online game. Furthermore, from the perspective of the institutional framing, it is argued that understandings from other media are not applicable in a straightforward manner, but must be carefully calibrated to matters such as game genre conventions and control over gameplay conduct. By describing the reasoning and knowledge displayed by gamers and game developers, the thesis contributes to interrelated discussions about knowledge development, currently carried out in educational science, interaction studies and game studies. In conclusion, it is suggested that digital games are establishing autonomy from other forms of entertainment media and software industries as a result of the ways games and gaming as multistable objects of knowledge have become deeply embedded in society