Australian Aboriginal anthropology at the crossroads: Finding a successor to A. P. Elkin, 1955

A. P. Elkin, who had dominated Australian anthropology since his appointment to the Chair of Anthropology at the University of Sydney in 1934, was concerned that coinciding with his retirement in 1955 was the possibility of the demise of Aboriginal anthropology as the core of the Sydney department. He thus attempted to influence the University authorities in their selection of his chosen successor, Ronald Murray Berndt. Such a selection would ensure the continuance of the department as the pre‐eminent authority on all matters to do with Aboriginal ethnography and affairs, and maintain its critical role in the formulation of policy with mission bodies and government. The other long‐serving member of the department, H. Ian Hogbin, was equally determined to see this did not happen. Hogbin wanted an appointment of a scholar who was in no way connected to Elkin. This would address the problem, inadvertently, of changing the focus of the department and would open the possibility of a shift in theoretical orientation and renewal. This article examines the machinations of the protagonists, the selection process, the quality of the candidates and the role of the mostly British‐based referees, especially the LSE‐based anthropologists Raymond Firth and Isaac Schapera, in shaping and influencing the decision to appoint the Africanist J. A. Barnes.     

Metabolic flux analysis using 13C peptide label measurements

¹³C metabolic flux analysis (MFA) has become the experimental method of choice to investigate the cellular metabolism of microbes, cell cultures and plant seeds. Conventional steady‐state MFA utilizes isotopic labeling measurements of amino acids obtained from protein hydrolysates. To retain spatial information in conventional steady‐state MFA, tissues or subcellular fractions must be dissected or biochemically purified. In contrast, peptides retain their identity in complex protein extracts, and may therefore be associated with a specific time of expression, tissue type and subcellular compartment. To enable ‘single‐sample’ spatially and temporally resolved steady‐state flux analysis, we investigated the suitability of peptide mass distributions (PMDs) as an alternative to amino acid label measurements. PMDs are the discrete convolution of the mass distributions of the constituent amino acids of a peptide. We investigated the requirements for the unique deconvolution of PMDs into amino acid mass distributions (AAMDs), the influence of peptide sequence length on parameter sensitivity, and how AAMD and flux estimates that are determined through deconvolution compare to estimates from a conventional GC–MS measurement‐based approach. Deconvolution of PMDs of the storage protein β–conglycinin of soybean (Glycine max) resulted in good AAMD and flux estimates if fluxes were directly fitted to PMDs. Unconstrained deconvolution resulted in inferior AAMD and flux estimates. PMD measurements do not include amino acid backbone fragments, which increase the information content in GC–MS‐derived analyses. Nonetheless, the resulting flux maps were of comparable quality due to the precision of Orbitrap quantification and the larger number of peptide measurements.     

Verb?nde, Veranstaltungen, Arbeitsvorhaben

Ohne Zusammenfassung     

Global patterns and predictors of stem CO2 efflux in forest ecosystems

Stem CO₂ efflux (E_S) plays an important role in the carbon balance of forest ecosystems. However, its primary controls at the global scale are poorly understood and observation‐based global estimates are lacking. We synthesized data from 121 published studies across global forest ecosystems and examined the relationships between annual E_S and biotic and abiotic factors at individual, biome, and global scales, and developed a global gridded estimate of annual E_S. We tested the following hypotheses: (1) Leaf area index (LAI) will be highly correlated with annual E_S at biome and global scales; (2) there will be parallel patterns in stem and root CO₂ effluxes (R_A) in all forests; (3) annual E_S will decline with forest age; and (4) LAI coupled with mean annual temperature (MAT) and mean annual precipitation (MAP) will be sufficient to predict annual E_S across forests in different regions. Positive linear relationships were found between E_S and LAI, as well as gross primary production (GPP), net primary production (NPP), wood NPP, soil CO₂ efflux (R_S), and R_A. Annual E_S was correlated with R_A in temperate forests after controlling for GPP and MAT, suggesting other additional factors contributed to the relationship. Annual E_S tended to decrease with stand age. Leaf area index, MAT and MAP, predicted 74% of variation in E_S at global scales. Our statistical model estimated a global annual E_S of 6.7 ± 1.1 Pg C yr⁻¹ over the period of 2000–2012 with little interannual variability. Modeled mean annual E_S was 71 ± 43, 270 ± 103, and 420 ± 134 g C m² yr⁻¹ for boreal, temperate, and tropical forests, respectively. We recommend that future studies report E_S at a standardized constant temperature, incorporate more manipulative treatments, such as fertilization and drought, and whenever possible, simultaneously measure both aboveground and belowground CO₂ fluxes.     

Public reason in justifications of conscientious objection in health care

Current mainstream approaches to conscientious objection either uphold the standards of public health care by preventing objections or protect the consciences of health‐care professionals by accommodating objections. Public justification approaches are a compromise position that accommodate conscientious objections only when objectors can publicly justify the grounds of their objections. Public justification approaches require objectors and assessors to speak a common normative language and to this end it has been suggested that objectors should be required to cast their objection in terms of public reason. We provide critical support for such a public reason condition and argue that it would be neither too demanding nor too permissive. We also respond to objections that it unfairly favours secular over religious objectors and that public reasons cannot be held with the kind of sincerity thought to characterize conscientious objections.