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Massey Research Online is an open access digital archive of the research and scholarship of Massey University and is jointly managed by the University Library and Information Technology Services.
Massey Research Online contains research theses and research outputs including published work by Massey University students and academic staff as well as peer-reviewed material not published elsewhere. In the case of previously published research outputs all requirements of copyright owners are observed.
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Exploring intrusive processes through the crystal cargo of volcanic rocks: The case of lava flows from Taranaki volcano, New Zealand
(Elsevier B V, 2024-11) D'Mello NG; Zellmer GF; Ubide T; Caulfield J; Usuki M; Iizuka Y; Kereszturi G; Procter JN; Stewart RB; Romano C
The present-day edifice of Taranaki volcano, New Zealand, is largely made up of lava flows extruded over approximately the last 8 kyr. The crystal cargo of plagioclase, pyroxene and amphibole in these lavas displays varied major, minor, and trace element zoning patterns, pointing to long and complex crystal growth histories. Crystal zoning patterns do not vary systematically between stratigraphic units, and multiple patterns are seen within the same sample over very short length scales. Intracrystalline elemental variations reveal mineral-melt interactions, which result in repeated resorption and recrystallisation in varied environments. Variable degrees of undercooling are evidenced by clinopyroxenes, with most crystals displaying sector zoning (ΔT < 50 K), while others only show concentric zoning, which suggests very low ΔT. The common occurrence of resorbed cores within the crystals and the prevalence of glomerocrysts indicate antecrystic and/or xenocrystic origins and crystal aggregation processes. We hypothesise that the repeated intrusion of melts into the crustal basement of Taranaki volcano has resulted in the formation of a heterogeneous subsolidus plutonic to supersolidus mushy (∼15–55 vol% crystals) system that interacts with intruding melts from the mantle. These interactions result in disaggregation of crystal clots from the plutonic intrusives and remobilization of the crystals through various sub-environments of small ephemeral mush pockets. Eruption-triggering injections of melt then pick up these crystals with varied growth histories to be extruded
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The Classification and Evolution of Bacterial Cross-Feeding
(Frontiers Media S.A., 2019-05-14) Smith NW; Shorten PR; Altermann E; Roy NC; McNabb WC; Harcombe W
Bacterial feeding has evolved toward specific evolutionary niches and the sources of energy differ between species and strains. Although bacteria fundamentally compete for nutrients, the excreted products from one strain may be the preferred energy source or a source of essential nutrients for another strain. The large variability in feeding preferences between bacterial strains often provides for complex cross-feeding relationships between bacteria, particularly in complex environments such as the human lower gut, which impacts on the host's digestion and nutrition. Although a large amount of information is available on cross-feeding between bacterial strains, it is important to consider the evolution of cross-feeding. Adaptation to environmental stimuli is a continuous process, thus understanding the evolution of microbial cross-feeding interactions allows us to determine the resilience of microbial populations to changes to this environment, such as changes in nutrient supply, and how new interactions might emerge in the future. In this review, we provide a framework of terminology dividing bacterial cross-feeding into four forms that can be used for the classification and analysis of cross-feeding dynamics. Under the proposed framework, we discuss the evolutionary origins for the four forms of cross-feeding and factors such as spatial structure that influence their emergence and subsequent persistence. This review draws from both the theoretical and experimental evolutionary literature to provide a cross-disciplinary perspective on the evolution of different types of cross-feeding.
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On the analysis of a heterogeneous coupled network of memristive Chialvo neurons
(Springer Nature, 2023-09-01) Ghosh I; Muni SS; Fatoyinbo HO
We perform a numerical study on the application of electromagnetic flux on a heterogeneous network of Chialvo neurons represented by a ring-star topology. Heterogeneities are realized by introducing additive noise modulations on both the central–peripheral and the peripheral–peripheral coupling links in the topology not only varying in space but also in time. The variation in time is understood by two coupling probabilities, one for the central–peripheral connections and the other for the peripheral–peripheral connections, respectively, that update the network topology with each iteration in time. We have further reported various rich spatiotemporal patterns like two-cluster states, chimera states, coherent, and asynchronized states that arise throughout the network dynamics. We have also investigated the appearance of a special kind of asynchronization behavior called “solitary nodes” that have a wide range of applications pertaining to real-world nervous systems. In order to characterize the behavior of the nodes under the influence of these heterogeneities, we have studied two different metrics called the “cross-correlation coefficient” and the “synchronization error.” Additionally, to capture the statistical property of the network, for example, how complex the system behaves, we have also studied a measure called “sample entropy.” Various two-dimensional color-coded plots are presented in the study to exhibit how these metrics/measures behave with the variation of parameters.
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Queer Representation in Mandarin Chinese Language Learning Textbooks of the United Kingdom
(Elsevier Ltd., 2024-08-31) Arden D; Pillay M
This paper uses a queer theoretical lens and mixed methods conceptual framework for use in assessing the level of queer representation of characters portrayed in Mandarin Chinese language learning textbooks published in the United Kingdom. MFL textbooks largely produce content which reinforces a perceive cisgendered, heteronormative characterisation of individuals within texts. Research that assesses the level of queer representation, tend towards focusing solely on gender or sexuality, and largely through qualitative research methods. Through the development of a mixed methods conceptual framework which allows for consideration of queer diversity along several spectra, the results of this study highlighted a significant lack of queer representation within Mandarin Chinese language learning textbooks. The implication of this is not only a mixed methods approach which accounts for often overlooked minority queer identities, but also identifying the need for a greater variety of queer representation within textbooks to better represent people of the 21st century.
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Older women's constructions of equality over the lifecourse
(Cambridge University Press, 2024-01-01) Beban A; Walters V; Ashley N; Cain T
Gender and age are central organising principles of social relations, with socially constructed gendered and age-based norms influencing patterns of social behaviour, power and inequality. Despite recent literature highlighting the importance of subjective measures of equality, including as a significant predictor of wellbeing, there is a gap in studies focused on subjective equality in research on ageing. Drawing on an equality ranking exercise and life herstory interviews with 20 older-aged women (65+) in Aotearoa New Zealand, this article focuses on the intersectionality of age and gender, analysing the ways in which participants constructed their experiences of equality over the lifecourse from their standpoint as older-aged women. The analysis reveals a significant rise in subjective equality from childhood to older age, with more varied responses in childhood and a convergence of responses from adolescence onwards. Participants' constructions of equality differed: age was the dominant construct of equality women ascribed to their childhood years, while gender inequality came to the fore during their teenage years. In early to mid-adulthood, women found ways to navigate gendered inequality in various life domains, while in older adulthood equality was constructed as freedom and life satisfaction. This trajectory suggests that the frames individuals use to make sense of equality and their personal experiences are not fixed; they are fluid and shift throughout the lifecourse.