Science Collected Works - Research Publications
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ItemGeneralizing Ribbons and the Twist of the Lattice Ribbon(SPRINGER, 2014-04)
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ItemDraft Genome of Chilean Honeybee (Apis mellifera) Gut Strain Lactobacillus kunkeei MP2(AMER SOC MICROBIOLOGY, 2014-10-09)Here, we report the first draft genome sequence of Lactobacillus kunkeei strain MP2, isolated from a Chilean honeybee gut. The sequenced genome has a total size of 1.58 Mb distributed into 44 contigs and 1,356 protein-coding sequences.
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ItemPostglacial Fringing-Reef to Barrier-Reef conversion on Tahiti links Darwin's reef types(NATURE PORTFOLIO, 2014-05-21)In 1842 Charles Darwin claimed that vertical growth on a subsiding foundation caused fringing reefs to transform into barrier reefs then atolls. Yet historically no transition between reef types has been discovered and they are widely considered to develop independently from antecedent foundations during glacio-eustatic sea-level rise. Here we reconstruct reef development from cores recovered by IODP Expedition 310 to Tahiti, and show that a fringing reef retreated upslope during postglacial sea-level rise and transformed into a barrier reef when it encountered a Pleistocene reef-flat platform. The reef became stranded on the platform edge, creating a lagoon that isolated it from coastal sediment and facilitated a switch to a faster-growing coral assemblage dominated by acroporids. The switch increased the reef's accretion rate, allowing it to keep pace with rising sea level, and transform into a barrier reef. This retreat mechanism not only links Darwin's reef types, but explains the re-occupation of reefs during Pleistocene glacio-eustacy.
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ItemCommentary: Bashful Boys and Coy Girls: A Review of Gender Differences in Childhood Shyness(Springer Science+Business Media New York., 2014-01-01)In this commentary we argue that subjective reviews of gender differences, as opposed to empirical meta-analyses, can be more affected by influences which may not yield an objective evaluation of the available evidence, including the potential overrepresentation of articles that do versus do not find gender differences and lack of a systematic evaluation of factors that influence findings. We consider theoretical bases for considering shyness to be detrimental to the development and wellbeing of girls. These include perspectives that characterize girls as being particularly affected by their personal relationships and children of both genders as influenced by patterns of same-gender interaction. Some perspectives are helpful in conceptualizing why gender difference patterns can be nuanced over the course of development, across different outcomes, contexts, and historical periods. We also briefly consider the utility of diathesis × stress and differential susceptibility models in understanding gendered patterns of adjustment. We argue that reviews of gender differences in childhood shyness should address the gender difference paradox in childhood shyness and anxiety. That is, why are gender differences in the prevalence of shyness typically absent in early to middle childhood (as concluded in the review article), but girls and women consistently demonstrate higher rates of anxiety disorders, including social anxiety disorder, than their male counterparts in adolescence and adulthood? Finally, we conclude with comments encouraging researchers to consider the potential consequences of how they convey messages about gender differences in childhood shyness. We suggest how such information can be communicated in a responsible manner.
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ItemMelittin peptides exhibit different activity on different cells and model membranes(SPRINGER WIEN, 2014-12)Melittin (MLT) is a lytic peptide with a broad spectrum of activity against both eukaryotic and prokaryotic cells. To understand the role of proline and the thiol group of cysteine in the cytolytic activity of MLT, native MLT and cysteine-containing analogs were prepared using solid phase peptide synthesis. The antimicrobial and cytolytic activities of the monomeric and dimeric MLT peptides against different cells and model membranes were investigated. The results indicated that the proline residue was necessary for antimicrobial activity and cytotoxicity and its absence significantly reduced lysis of model membranes and hemolysis. Although lytic activity against model membranes decreased for the MLT dimer, hemolytic activity was increased. The native peptide and the MLT-P14C monomer were mainly unstructured in buffer while the dimer adopted a helical conformation. In the presence of neutral and negatively charged vesicles, the helical content of the three peptides was significantly increased. The lytic activity, therefore, is not correlated to the secondary structure of the peptides and, more particularly, on the propensity to adopt helical conformation.
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ItemDoes pyrodiversity beget alpha, beta or gamma diversity? A case study using reptiles from semi-arid Australia(WILEY-BLACKWELL, 2014-06)Abstract Aim A common assumption in fire ecology and management is that landscapes with a greater diversity of fire‐ages will support a greater diversity of animal species (i.e. ‘pyrodiversity begets biodiversity’). This assumption is based on the idea that landscapes with a more diverse fire history provide a greater array of post‐fire habitats, leading to a greater number of species within the landscape. We assessed the hypothesis that pyrodiversity begets biodiversity by enhancing community differentiation (β diversity), resulting in increased landscape‐scale richness (γ‐diversity). We used reptiles as a case‐study. Location The Mallee region of south‐eastern Australia. Methods We used a study design in which ‘whole’ fire mosaics (12.6 km2) were the unit of replication. Study landscapes (n = 28) were selected to represent a gradient in the diversity and extent of fire‐age classes. We surveyed reptiles by using pitfall traps at 10 sites within each landscape (280 sites in total). Reptile data were used to characterize reptile assemblages at the landscape‐scale in three ways: alpha (average within‐site diversity), beta (between‐site diversity) and gamma diversity (total diversity). Results The diversity of fire‐age classes had little influence on the alpha, beta or gamma diversity of reptile assemblages. The properties of fire mosaics that most influenced assemblages were the extent of structurally important fire‐age classes. The extent of long‐unburned vegetation increased beta diversity but reduced alpha diversity of the total reptile assemblage, essentially cancelling each other out at the landscape scale. Main conclusions This study highlights the importance of considering multiple measures of diversity when exploring the influence of landscape properties on biodiversity, as ‘null’ results at the landscape scale (gamma diversity) can result from contrasting patterns in alpha and beta diversity. Using fire to create habitat mosaics, at the scale of this study, is unlikely to enhance the status of reptiles in the region.
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ItemThe Citrus Flavone Nobiletin Reduces Pro-Inflammatory and Pro-Labour Mediators in Fetal Membranes and Myometrium: Implications for Preterm Birth(PUBLIC LIBRARY SCIENCE, 2014-09-19)Spontaneous preterm birth is the leading cause of infant death and of neurological disabilities in survivors. A significant proportion of spontaneous preterm births are associated with infection. Infection activates inflammation which induces a cascade of events that leads to myometrial contractions and rupture of fetal membranes. In non-gestational tissues, the citrus flavone nobiletin has been shown to exert potent anti-inflammatory properties. Thus, in this study, we sought to determine the effect of nobiletin on pro-inflammatory mediators in human fetal membranes and myometrium. Human fetal membranes and myometrium were treated with bacterial endotoxin lipopolysaccharide (LPS) in the absence or presence of nobiletin. In addition, the effect of nobiletin in fetal membranes taken from spontaneous preterm deliveries with and without infection (i.e. histological chorioamnionitis) was also examined. In human fetal membranes and myometrium, nobiletin significantly decreased LPS-stimulated expression of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6 and IL-8) and MMP-9 expression and pro-MMP-9 secretion. Additionally, nobiletin significantly decreased COX-2 expression and subsequent prostaglandin (PG) E2 production. Notably, nobiletin was also able to reduce the expression and production of pro-inflammatory cytokines and MMP-9 in fetal membranes taken from women after spontaneous preterm birth. In conclusion, our study demonstrates that nobiletin can reduce infection-induced pro-inflammatory mediators in human fetal membranes and myometrium. These in vitro studies further support the increasing volume and quality of evidence that high fruit and vegetable intake in pregnancy is associated with a decreased risk of adverse pregnancy outcomes.
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ItemGlobal Drivers and Tradeoffs of Three Urban Vegetation Ecosystem Services(PUBLIC LIBRARY SCIENCE, 2014-11-17)Our world is increasingly urbanizing which is highlighting that sustainable cities are essential for maintaining human well-being. This research is one of the first attempts to globally synthesize the effects of urbanization on ecosystem services and how these relate to governance, social development and climate. Three urban vegetation ecosystem services (carbon storage, recreation potential and habitat potential) were quantified for a selection of a hundred cities. Estimates of ecosystem services were obtained from the analysis of satellite imagery and the use of well-known carbon and structural habitat models. We found relationships between ecosystem services, social development, climate and governance, however these varied according to the service studied. Recreation potential was positively related to democracy and negatively related to population. Carbon storage was weakly related to temperature and democracy, while habitat potential was negatively related to democracy. We found that cities under 1 million inhabitants tended to have higher levels of recreation potential than larger cities and that democratic countries have higher recreation potential, especially if located in a continental climate. Carbon storage was higher in full democracies, especially in a continental climate, while habitat potential tended to be higher in authoritarian and hybrid regimes. Similar to other regional or city studies we found that the combination of environment conditions, socioeconomics, demographics and politics determines the provision of ecosystem services. Results from this study showed the existence of environmental injustice in the developing world.
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ItemA Plan to Push Limits? Investigating the ecologically sustainable development dimensions of Melbourne's Central Region sustainable water strategy(ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD, 2014-01-02)