1,451 research outputs found
Human behavioural adaptations to interglacial lakeshore environments
The Schƶningen 13II-4 āSpear Horizonā is among the most famous lakeshore archaeological sites dating from the Middle Pleistocene in Europe. Multiple well-crafted wooden spears recovered together with a large assemblage of butchered horse bones at Schƶningen stimulated a new outlook of the behavioural capabilities of Palaeolithic hunters. Since these discoveries, a wealth of geological and palaeoecological data have been generated to reconstruct the wider Schƶningen interglacial lakeshore environment. Yet, the underlying social and economic behaviours of Middle Pleistocene hominins reflected in the archaeological record itself have received less attention. To address these shortcomings, we began a comprehensive zooarchaeological and taphonomic analysis of the entire large mammalian assemblage from the Schƶningen 13II-4 āSpear Horizonā, with the goal of re-focusing attention to the āhuman componentā of this important site. Here we present the preliminary results of our research
Finite to infinite steady state solutions, bifurcations of an integro-differential equation
We consider a bistable integral equation which governs the stationary
solutions of a convolution model of solid--solid phase transitions on a circle.
We study the bifurcations of the set of the stationary solutions as the
diffusion coefficient is varied to examine the transition from an infinite
number of steady states to three for the continuum limit of the
semi--discretised system. We show how the symmetry of the problem is
responsible for the generation and stabilisation of equilibria and comment on
the puzzling connection between continuity and stability that exists in this
problem
GOG 244-The lymphedema and gynecologic cancer (LEG) study: Incidence and risk factors in newly diagnosed patients
Ā© 2019 Elsevier Inc. Objectives: To evaluate the incidence and risk factors for lymphedema associated with surgery for gynecologic malignancies on GOG study 244. Methods: Women undergoing a lymph node dissection for endometrial, cervical, or vulvar cancer were eligible for enrollment. Leg volume was calculated from measurements at 10-cm intervals starting 10 cm above the bottom of the heel to the inguinal crease. Measurements were obtained preoperatively and postoperatively at 4ā6 weeks, and at 3-, 6-, 9-, 12-, 18-, and 24- months. Lymphedema was defined as a limb volume change (LVC) ā„10% from baseline and categorized as mild: 10ā19% LVC; moderate: 20ā40% LVC; or severe: \u3e40% LVC. Risk factors associated with lymphedema were also analyzed. Results: Of 1054 women enrolled on study, 140 were inevaluable due to inadequate measurements or eligibility criteria. This left 734 endometrial, 138 cervical, and 42 vulvar patients evaluable for LVC assessment. Median age was 61 years (range, 28ā91) in the endometrial, 44 years (range, 25ā83) in the cervical, and 58 years (range, 35ā88) in the vulvar group. The incidence of LVC ā„10% was 34% (n = 247), 35% (n = 48), and 43% (n = 18), respectively. The peak incidence of lymphedema was at the 4ā6 week assessment. Logistic regression analysis showed a decreased risk with advanced age (p = 0.0467). An exploratory analysis in the endometrial cohort showed an increased risk with a node count \u3e8 (p = 0.033). Conclusions: For a gynecologic cancer, LVC decreased with age greater than 65, but increased with a lymph node count greater than 8 in the endometrial cohort. There was no association with radiation or other risk factors
Australian scallops do not recognise the introduced predatory seastar Asterias amurensis
Copyright Ā© 2005 Inter-Research.Escape responses of Australian scallops (Pecten fumatus and Chlamys asperrima) to native and introduced predatory seastars were compared in laboratory and field trials. The native seastar Coscinasterias muricata elicited an almost immediate escape response by scallops in all trials. In contrast, there was a low frequency of escape response exhibited by scallops when held in contact with the introduced seastar Asterias amurensis. These results are consistent with the hypothesis that escape response in invertebrates has evolved relative to predation risk. The absence of predator recognition in marine invertebrates may have serious implications for wild and farmed populations in southern Australia where introduced predators are prevalent.Kate S. Hutson, D. Jeff Ross, Rob W. Day, John J. Aher
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