title: Self-assembly of a columnar polymeric calcium phosphinate derived from camphene

authors: Henderson, William

subjects: chemistry

abstract: (2,2-Dimethylbicyclo[2.2.1] hept-3-ylmethyl)phosphinic acid (RPO₂H₂), readily prepared from camphene and hypophosphorous acid, formed a polymeric calcium salt [{Ca(RPO₂H) ₂ (RPO₂H₂)(H₂O)}n], with both terminal and triply bridging phosphinate groups, and an overall columnar structure with an inorganic core and a pseudo-close-packed sheath of terpene moieties.

text: Self-assembly of a columnar polymeric calcium phosphinate derived from camphene (2,2-Dimethylbicyclo[2.2.1] hept-3-ylmethyl)phosphinic acid (RPO₂H₂), readily prepared from camphene and hypophosphorous acid, formed a polymeric calcium salt [{Ca(RPO₂H) ₂ (RPO₂H₂)(H₂O)}n], with both terminal and triply bridging phosphinate groups, and an overall columnar structure with an inorganic core and a pseudo-close-packed sheath of terpene moieties.

year: 1995

title: Applying generalized allometric regressions to predict live body mass of tropical and temperate arthropods

authors: Sohlstroem, Esra H.

subjects: Science & Technology

abstract: The ecological implications of body size extend from the biology of individual organisms to ecosystem‐level processes. Measuring body mass for high numbers of invertebrates can be logistically challenging, making length–mass regressions useful for predicting body mass with minimal effort. However, standardized sets of scaling relationships covering a large range in body length, taxonomic groups, and multiple geographical regions are scarce. We collected 6,212 arthropods from 19 higher‐level taxa in both temperate and tropical locations to compile a comprehensive set of linear models relating live body mass to a range of predictor variables. We measured live weight (hereafter, body mass), body length and width of each individual and conducted linear regressions to predict body mass using body length, body width, taxonomic group, and geographic region. Additionally, we quantified prediction discrepancy when using parameters from arthropods of a different geographic region. Incorporating body width into taxon‐ and region‐specific length–mass regressions yielded the highest prediction accuracy for body mass. Using regression parameters from a different geographic region increased prediction discrepancy, causing over‐ or underestimation of body mass depending on geographical origin and whether body width was included. We present a comprehensive range of parameters for predicting arthropod body mass and provide guidance for selecting optimal scaling relationships. Given the importance of body mass for functional invertebrate ecology and the paucity of adequate regressions to predict arthropod body mass from different geographical regions, our study provides a long‐needed resource for quantifying live body mass in invertebrate ecology research.

text: Applying generalized allometric regressions to predict live body mass of tropical and temperate arthropods The ecological implications of body size extend from the biology of individual organisms to ecosystem‐level processes. Measuring body mass for high numbers of invertebrates can be logistically challenging, making length–mass regressions useful for predicting body mass with minimal effort. However, standardized sets of scaling relationships covering a large range in body length, taxonomic groups, and multiple geographical regions are scarce. We collected 6,212 arthropods from 19 higher‐level taxa in both temperate and tropical locations to compile a comprehensive set of linear models relating live body mass to a range of predictor variables. We measured live weight (hereafter, body mass), body length and width of each individual and conducted linear regressions to predict body mass using body length, body width, taxonomic group, and geographic region. Additionally, we quantified prediction discrepancy when using parameters from arthropods of a different geographic region. Incorporating body width into taxon‐ and region‐specific length–mass regressions yielded the highest prediction accuracy for body mass. Using regression parameters from a different geographic region increased prediction discrepancy, causing over‐ or underestimation of body mass depending on geographical origin and whether body width was included. We present a comprehensive range of parameters for predicting arthropod body mass and provide guidance for selecting optimal scaling relationships. Given the importance of body mass for functional invertebrate ecology and the paucity of adequate regressions to predict arthropod body mass from different geographical regions, our study provides a long‐needed resource for quantifying live body mass in invertebrate ecology research.

year: 2018

title: Media psychology, symbolic power and social justice in Aotearoa

authors: Hodgetts, Darrin

subjects: media

abstract: Psychologists reside in a world saturated by media. We work in professional contexts where guidelines for practice foreground ethical obligations to address issues of social justice. This paper addresses both these contextual dimensions of psychological research and practice. We explore the social significance of increased media production by Maori in challenging the tendency in mainstream media to marginalize Maori concerns while promoting Pakeha perspectives. The analysis focuses on the recent 'Inside Out documentary - Hikoi', which was initiated by two young Maori women as a challenge to media framing of Maori protests as 'unjustified' and 'disruptive' acts. We illustrate how this documentary furthers public dialogue regarding the foreshore and seabed controversy by promoting an alternative depiction of a Maori protest, which emphasize the history of grievances and social unity. The implications of such representations for psychologists working to address issues of social justice and to challenge abuses of symbolic power are discussed.

text: Media psychology, symbolic power and social justice in Aotearoa Psychologists reside in a world saturated by media. We work in professional contexts where guidelines for practice foreground ethical obligations to address issues of social justice. This paper addresses both these contextual dimensions of psychological research and practice. We explore the social significance of increased media production by Maori in challenging the tendency in mainstream media to marginalize Maori concerns while promoting Pakeha perspectives. The analysis focuses on the recent 'Inside Out documentary - Hikoi', which was initiated by two young Maori women as a challenge to media framing of Maori protests as 'unjustified' and 'disruptive' acts. We illustrate how this documentary furthers public dialogue regarding the foreshore and seabed controversy by promoting an alternative depiction of a Maori protest, which emphasize the history of grievances and social unity. The implications of such representations for psychologists working to address issues of social justice and to challenge abuses of symbolic power are discussed.

year: 2004-11-19