Social and Behavioral Sciences Commons^™

Delineating Regions With Permeable Boundaries In New Guinea., Terence Hays

Terence Hays

Hays sets out the linkages among communities and societies as they form networks and regions in New Guinea. Hays reminds us of the long standing concern within the recent literature from New Guinea that supports the "primitive isolates" notion that is still with us. The "my people" syndrome still plagues the legions of researchers who seek to study a small distinct population that is largely uncontaminated by outside influences and remains primitive. He paints the picture of this primitive society by describing New Guinea topographically as a land of inaccessible mountain valleys, impenetrable swamps, and remote rain forests which make …

They Are Beginning To Learn The Use Of Tobacco, Terence Hays

Terence Hays

European colonization attracts laborers whose performance was enhanced by their employers through the use of drugs. Tobacco provided Europeans a way to manipulate populations engaged in new work activities in the non-Western world. Hays argues that control of native labor was the result of control of an addictive American commercial product.

Dental Enamel As A Dietary Indicator In Mammals, Peter Lucas, Paul Constantino, Bernard Wood, Brian Lawn

Paul J. Constantino

The considerable variation in shape, size, structure and properties of the enamel cap covering mammalian teeth is a topic of great evolutionary interest. No existing theories explain how such variations might be fit for the purpose of breaking food particles down. Borrowing from engineering materials science, we use principles of fracture and deformation of solids to provide a quantitative account ofhowmammalian enamelmay be adapted to diet. Particular attention is paid to mammals that feed on ‘hard objects’ such as seeds and dry fruits, the outer casings of which appear to have evolved structures with properties similar to those of enamel. …

Predicting Failure In Mammalian Enamel, Brian Lawn, James Lee, Paul Constantino, Peter Lucas

Paul J. Constantino

Dentition is a vital element of human and animal function, yet there is little fundamental knowledge about how tooth enamel endures under stringent oral conditions. This paper describes a novel approach to the issue. Model glass dome specimens fabricated from glass and back­filled with polymer resin are used as representative of the basic enamel/dentine shell structure. Contact loading is used to deform the dome structures to failure, in simulation of occlusal loading with opposing dentition or food bolus. To investigate the role of enamel microstructure, additional contact tests are conducted on two­phase materials that capture the essence of the mineralized­rod/organic­sheath …

Adaptation To Hard-Object Feeding In Sea Otters And Hominins, Paul Constantino, James Lee, Dylan Morris, Peter Lucas, Adam Hartstone-Rose, Wah-Keat Lee, Nathaniel Dominy, Andrew Cunningham, Mark Wagner, Brian Lawn

Paul J. Constantino

The large, bunodont postcanine teeth in living sea otters (Enhydra lutris) have been likened to those of certain fossil hominins, particularly the ’robust’ australopiths (genus Paranthropus). We examine this evolutionary convergence by conducting fracture experiments on extracted molar teeth of sea otters and modern humans (Homo sapiens) to determine how load-bearing capacity relates to tooth morphology and enamel material properties. In situ optical microscopy and x-ray imaging during simulated occlusal loading reveal the nature of the fracture patterns. Explicit fracture relations are used to analyze the data and to extrapolate the results from humans to earlier hominins. It is shown …

Fracture Susceptibility Of Worn Teeth, Amanda Keown, Mark Bush, James Lee, Chris Ford, Paul Constantino, Brian Lawn

Paul J. Constantino

An experimental simulation study is made to determine the effects of occlusal wear on the capacity of teeth to resist fracture. Tests are carried out on model dome structures, using glass shells to represent enamel and epoxy filler to represent dentin. The top of the domes are ground and polished to produce flat surfaces of prescribed depths relative to shell thickness. The worn surfaces are then loaded axially with a hard sphere, or a hard or soft flat indenter, to represent extremes of food contacts. The loads required to drive longitudinal cracks around the side walls of the enamel to …

Microwear, Mechanics And The Feeding Adaptations Of Australopithecus Africanus, Paul Constantino, Craig Byron, Paul Dechow, Ian Gross, Peter Lucas, Brian Richmond, Callum Ross, Dennis Slice, Mark Spencer, Dennis Strait, Qian Wang, Gerhard Weber, Bernard Wood, Barth Wright

Paul J. Constantino

Recent studies of dental microwear and craniofacial mechanics have yielded contradictory interpretations regarding the feeding ecology and adaptations of Australopithecus africanus. As part of this debate, the methods used in the mechanical studies have been criticized. In particular, it has been claimed that finite element analysis has been poorly applied to this research question. This paper responds to some of these mechanical criticisms, highlights limitations of dental microwear analysis, and identifies avenues of future research.

Properties Of Tooth Enamel In Great Apes, Paul Constantino, Brian Lawn, James Lee, Peter Lucas, Dylan Morris, Tanya Smith

Paul J. Constantino

A comparative study has been made of human and great ape molar tooth enamel. Nanoindentation techniques are used to map profiles of elastic modulus and hardness across sections from the enamel–dentin junction to the outer tooth surface. The measured data profiles overlap between species, suggesting a degree of commonality in material properties. Using established deformation and fracture relations, critical loads to produce function-threatening damage in the enamel of each species are calculated for characteristic tooth sizes and enamel thicknesses. The results suggest that differences in load-bearing capacity of molar teeth in primates are less a function of underlying material properties …

Introduction To Encyclopedia Of World Cultures Volume 2, Oceania, Terence Hays

Terence Hays

No abstract provided.

Runx2 Tandem Repeats And The Evolution Of Facial Length In Placental Mammals, Marie Pointer, Jason Kamilar, Vera Warmuth, Stephen Chester, Frédéric Delsuc, Nicholas Mundy, Robert Asher, Brenda Bradley

Jason M. Kamilar

Background When simple sequence repeats are integrated into functional genes, they can potentially act as evolutionary ‘tuning knobs’, supplying abundant genetic variation with minimal risk of pleiotropic deleterious effects. The genetic basis of variation in facial shape and length represents a possible example of this phenomenon. Runt-related transcription factor 2 (RUNX2), which is involved in osteoblast differentiation, contains a functionally-important tandem repeat of glutamine and alanine amino acids. The ratio of glutamines to alanines (the QA ratio) in this protein seemingly influences the regulation of bone development. Notably, in domestic breeds of dog, and in carnivorans in general, the ratio …

How Culture Makes Us Human: Primate Social Evolution And The Formation Of Human Societies, Dwight W. Read

Dwight W Read

Uncovering The Role Of Bioarchaeology: Mass Graves And Modernity In Catalunya, Justin Ak Helepololei

Justin AK Helepololei

No abstract provided.

War, Forced Displacement And Growth In Laotian Adults, Patrick F. Clarkin

Patrick F. Clarkin

Background: Evidence from several populations suggests

that war negatively impacts civilian nutrition, physical growth and overall health. This effect is often enduring or permanent, particularly if experienced early in life.

Aim: To assess whether the number of lifetime displacement

experiences and being displaced in infancy were associated with adult height, sitting height, leg length and the sitting height ratio.

Subjects and methods: Retrospective questionnaires on

displacement and resettlement experiences and

anthropometric data were collected from a sample of Laotian adult refugees (ethnic Hmong and Lao; n ¼ 365). All were born in Laos or Thailand and had resettled in French …