The influence of diet on the distribution of nitrogen isotopes in animals was investigated by analyzing animals grown in the laboratory on diets of constant nitrogen isotopic composition. 
The isotopic composition of the nitrogen in an animal reflects the nitrogen isotopic composition of its diet. The δ^(15)N values of the whole bodies of animals are usually more positive than those of their diets. Different individuals of a species raised on the same diet can have significantly different δ^(15)N values. The variability of the relationship between the δ^(15)N values of animals and their diets is greater for different species raised on the same diet than for the same species raised on different diets. Different tissues of mice are also enriched in ^(15)N relative to the diet, with the difference between the δ^(15)N values of a tissue and the diet depending on both the kind of tissue and the diet involved. The δ^(15)N values of collagen and chitin, biochemical components that are often preserved in fossil animal remains, are also related to the δ^(15)N value of the diet. 
The dependence of the δ^(15)N values of whole animals and their tissues and biochemical components on the δ^(15)N value of diet indicates that the isotopic composition of animal nitrogen can be used to obtain information about an animal's diet if its potential food sources had different δ^(15)N values. The nitrogen isotopic method of dietary analysis probably can be used to estimate the relative use of legumes vs non-legumes or of aquatic vs terrestrial organisms as food sources for extant and fossil animals. However, the method probably will not be applicable in those modern ecosystems in which the use of chemical fertilizers has influenced the distribution of nitrogen isotopes in food sources. 
The isotopic method of dietary analysis was used to reconstruct changes in the diet of the human population that occupied the Tehuacan Valley of Mexico over a 7000 yr span. Variations in the δ^(15)C and δ^(15)N values of bone collagen suggest that C_4 and/or CAM plants (presumably mostly corn) and legumes (presumably mostly beans) were introduced into the diet much earlier than suggested by conventional archaeological analysis.

Influence of Diet On the Distribtion of Nitrogen Isotopes in Animals

萨义德以其独特的双重身份,对西方中心权力话语做了分析,通过对文学作品、演讲演说等文本的解读,将O rie n ta lis m——"东方学",做了三重释义:一门学科、一种思维方式和一种权力话语系统,对东方学权力话语做了系统的批判,同时将东方学放入空间维度对东方学文本做了细致的解读。

萨义德的“Orientalism”释义

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Death without weeping: the violence of everyday life in Brazil

Porosities in the outer table of the cranial vault (porotic hyperostosis) and orbital roof (cribra orbitalia) are among the most frequent pathological lesions seen in ancient human skeletal collections. Since the 1950s, chronic iron-deficiency anemia has been widely accepted as the probable cause of both conditions. Based on this proposed etiology, bioarchaeologists use the prevalence of these conditions to infer living conditions conducive to dietary iron deficiency, iron malabsorption, and iron loss from both diarrheal disease and intestinal parasites in earlier human populations. This iron-deficiency-anemia hypothesis is inconsistent with recent hematological research that shows iron deficiency per se cannot sustain the massive red blood cell production that causes the marrow expansion responsible for these lesions. Several lines of evidence suggest that the accelerated loss and compensatory over-production of red blood cells seen in hemolytic and megaloblastic anemias is the most likely proximate cause of porotic hyperostosis. Although cranial vault and orbital roof porosities are sometimes conflated under the term porotic hyperostosis, paleopathological and clinical evidence suggests they often have different etiologies. Reconsidering the etiology of these skeletal conditions has important implications for current interpretations of malnutrition and infectious disease in earlier human populations.

The causes of porotic hyperostosis and cribra orbitalia: a reappraisal of the iron-deficiency-anemia hypothesis.

Spondylodiscitis, a term encompassing vertebral osteomyelitis, spondylitis and discitis, is the main manifestation of haematogenous osteomyelitis in patients aged over 50 years. Staphylococcus aureus is the predominant pathogen, accounting for about half of non-tuberculous cases. Diagnosis is difficult and often delayed or missed due to the rarity of the disease and the high frequency of low back pain in the general population. In this review of the published literature, we found no randomized trials on treatment and studies were too heterogeneous to allow comparison. Improvements in surgical and radiological techniques and the discovery of antimicrobial therapy have transformed the outlook for patients with this condition, but morbidity remains significant. Randomized trials are needed to assess optimal treatment duration, route of administration, and the role of combination therapy and newer agents.

Spondylodiscitis: update on diagnosis and management

Recently, the value of the study of children and childhood from archaeological contexts has become more recognized. Childhood is both a biological and a social phenomenon. However, because of specialization in research fields within anthropology, subadults from the archaeological record are usually studied from the biological perspective (bioarchaeology) or, more predominantly, the social perspective (social archaeology), with little research that incorporates both approaches. These polarized approaches to childhood and age highlight the dualistic way in which “biological” and “social” aspects of the body are viewed. Some recent literature criticizes bioarchaeological approaches, and calls for the incorporation of childhood social theory, including social age categories, into subadult health analysis. However, few studies have explicitly addressed the practicalities or theoretical issues that need to be considered when attempting this. This paper critically examines these issues, including terminology used for defining subadulthood and age divisions within it, and approaches to identify “social age” in past populations. The important contribution that bioarchaeology can make to the study of social aspects of childhood is outlined. Recent theoretical approaches for understanding the body offer exciting opportunities to incorporate skeletal remains into research, and develop a more biologically and socially integrated understanding of childhood and age.

The Bioarchaeological Investigation of Childhood and Social Age: Problems and Prospects

‘Abscess cavity’—a misnomer

The agricultural transition has long been recognized to have been a very important period in human prehistory. Its timing and consequences, including the effects on human health, have been intensively researched. In recent decades, this has included the idea that there is a universal positive correlation between the adoption of agriculture based on a carbohydrate staple crop and dental caries prevalence. This is mainly based on evidence from America, where maize was the staple crop. On the basis of evidence from prehistoric skeletal samples from a series of prehistoric sites in Southeast Asia, this correlation does not appear to apply in areas of the world where the staple crop is rice. Although we have looked only at dental caries, we suggest that caution be applied in the drawing of inferences about subsistence changes from dental health. Patterns reflecting the adoption of one starchy staple are not necessarily applicable to all such crops.

Agriculture and dental caries? The case of rice in prehistoric Southeast Asia

Re-examining the chemical evaluation of diagenesis in human bone apatite

The recent excavation of a sample of 120 human skeletons from an Iron Age site in the valley of the Mun River, a tributary of the Mekong River on the Khorat Plateau in northeast Thailand, has provided the largest sample from this period in the region to date. This paper reviews three individuals from the sample with pathological changes for which the differential diagnosis includes systemic infectious disease. In two of these, both males with lesions of the hands and feet, leprosy and psoriatic arthritis are discussed as differential diagnoses, with leprosy the most probable. In the third, a female with lesions of the spine, the differential diagnosis includes tuberculosis and nonspecific osteomyelitis. Tuberculosis is the most probable diagnosis. Although the focus of this paper is a presentation of the evidence for infectious disease at Noen U-Loke, the significance of probable diagnoses of mycobacterial diseases for the history of the diseases and for prehistory in mainland Southeast Asia is also briefly discussed.

Nancy Tayles

Papers

The Bioarchaeological Investigation of Childhood and Social Age: Problems and Prospects

‘Abscess cavity’—a misnomer

Agriculture and dental caries? The case of rice in prehistoric Southeast Asia

Re-examining the chemical evaluation of diagenesis in human bone apatite

Leprosy and tuberculosis in Iron Age Southeast Asia