824 research outputs found
The cyanobacterial chlorophyll-binding-protein IsiA acts to increase the in vivo effective absorption cross-section of PSI under iron limitation
No full textIron availability limits primary production in >30% of the world’s oceans; hence phytoplankton have developed acclimation strategies. In particular, cyanobacteria express IsiA (iron-stress-induced) under iron stress, which can become the most abundant chl-binding protein in the cell. Within iron-limited oceanic regions with significant cyanobacterial biomass, IsiA may represent a significant fraction of the total chl. We spectroscopically measured the effective cross-section of the photosynthetic reaction center PSI (?PSI) in vivo and biochemically quantified the absolute abundance of PSI, PSII, and IsiA in the model cyanobacterium Synechocystis sp. PCC 6803. We demonstrate that accumulation of IsiA results in a ?60% increase in ?PSI, in agreement with the theoretical increase in cross-section based on the structure of the biochemically isolated IsiA-PSI supercomplex from cyanobacteria. Deriving a chl budget, we suggest that IsiA plays a primary role as a light-harvesting antenna for PSI. On progressive iron-stress in culture, IsiA continues to accumulate without a concomitant increase in ?PSI, suggesting that there may be a secondary role for IsiA. In natural populations, the potential physiological significance of the uncoupled pool of IsiA remains to be established. However, the functional role as a PSI antenna suggests that a large fraction of IsiA-bound chl is directly involved in photosynthetic electron transport
The Woman-State conflict: a deconstruction of fetal rights discourse and its damaging effect on women's reproductive rights
No full textReproductive rights have been historically steeped in “moral” discourse. The “morality” involves anti-choice policy makers and interest groups taking a protectionist standpoint for the fetus, or “unborn child” by purporting that it is a living person. However noble a cause this may seem, the passing of restrictive reproductive rights policy under the “moral” guise has devastating effects on women. These effects are telling of an underlying cause of the anti-choice movement – one that involves removing women from reproductive responsibilities and processes, thus chipping away at individual liberties, citizenship and bodily autonomy. This paper asserts that the fetus is misappropriated by policy makers and ideological anti-choice groups as a tactical pawn to perpetuate control over women’s reproductive choices. This paper focuses on the seven U.S. states with the most restrictive reproductive rights policies—Alabama, Colorado, Louisiana, Nebraska, North Dakota, Oklahoma, and South Dakota— using an analysis of the language of their policies and pending legislation. Findings demonstrate that anti-choice groups and policy makers forward a normative social construction of women in discourse and images and attempt to make restrictive legislation more acceptable to the polity. Furthermore, findings show that the anti-choice narrative of fetal personhood is a pretense for enacting state-mandated control over women’s reproductive choices. This work supports a growing field of research on reproductive rights policy, as well as provides an analytical approach to how theory underlies policy.M. A.Includes bibliographical referencesIncludes vitaby Amanda M. Robert
Interactions between Thermal Acclimation, Growth Rate, and Phylogeny Influence Prochlorococcus Elemental Stoichiometry.
No full textVariability in plankton elemental requirements can be important for global ocean biogeochemistry but we currently have a limited understanding of how ocean temperature influences the plankton C/N/P ratio. Multiple studies have put forward a 'translation-compensation' hypothesis to describe the positive relationship between temperature and plankton N/P or C/P as cells should have lower demand for P-rich ribosomes and associated depressed QP when growing at higher temperature. However, temperature affects many cellular processes beyond translation with unknown outcomes on cellular elemental composition. In addition, the impact of temperature on growth and elemental composition of phytoplankton is likely modulated by the life history and growth rate of the organism. To test the direct and indirect (via growth rate changes) effect of temperature, we here analyzed the elemental composition and ratios in six strains affiliated with the globally abundant marine Cyanobacteria Prochlorococcus. We found that temperature had a significant positive effect on the carbon and nitrogen cell quota, whereas no clear trend was observed for the phosphorus cell quota. The effect on N/P and C/P were marginally significantly positive across Prochlorococcus. The elemental composition and ratios of individual strains were also affected but we found complex interactions between the strain identity, temperature, and growth rate in controlling the individual elemental ratios in Prochlorococcus and no common trends emerged. Thus, the observations presented here does not support the 'translation-compensation' theory and instead suggest unique cellular elemental effects as a result of rising temperature among closely related phytoplankton lineages. Thus, the biodiversity context should be considered when predicting future elemental ratios and how cycles of carbon, nitrogen, and phosphorus may change in a future ocean
A Key Marine Diazotroph in a Changing Ocean: The Interacting Effects of Temperature, CO2 and Light on the Growth of Trichodesmium erythraeum IMS101
No full textTrichodesmium is a globally important marine diazotroph that accounts for approximately 60-80% of marine biological N2 fixation and as such plays a key role in marine N and C cycles. We undertook a comprehensive assessment of how the growth rate of Trichodesmium erythraeum IMS101 was directly affected by the combined interactions of temperature, pCO2 and light intensity. Our key findings were: low pCO2 affected the lower temperature tolerance limit (Tmin) but had no effect on the optimum temperature (Topt) at which growth was maximal or the maximum temperature tolerance limit (Tmax); low pCO2 had a greater effect on the thermal niche width than low-light; the effect of pCO2 on growth rate was more pronounced at suboptimal temperatures than at supraoptimal temperatures; temperature and light had a stronger effect on the photosynthetic efficiency (Fv/Fm) than did CO2; and at Topt, the maximum growth rate increased with increasing CO2, but the initial slope of the growth-irradiance curve was not affected by CO2. In the context of environmental change, our results suggest that the (i) nutrient replete growth rate of Trichodesmium IMS101 would have been severely limited by low pCO2 at the last glacial maximum (LGM), (ii) future increases in pCO2 will increase growth rates in areas where temperature ranges between Tmin to Topt, but will have negligible effect at temperatures between Topt and Tmax, (iii) areal increase of warm surface waters (> 18°C) has allowed the geographic range to increase significantly from the LGM to present and that the range will continue to expand to higher latitudes with continued warming, but (iv) continued global warming may exclude Trichodesmium spp. from some tropical regions by 2100 where temperature exceeds Topt
Groundwater resources of the Harney Basin, southeastern Oregon
No full textauthors: Stephen B. Gingerich, C. Amanda Garcia, and Henry M. Johnson.Title from PDF caption (viewed on November 22, 2022).This archived document is maintained by the State Library of Oregon. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references (page 6).Mode of access: Internet from the State Library of Oregon U.S. Government Publications Collection.Text in English
Partner Facilitation and Partner Interference in Individuals' Weight Loss Goals
No full textDrawing on the logic of the relational turbulence model, this study examined the ways in which romantic partners facilitate and interfere with individuals’ weight loss goals. Participants (N = 122) described the ways in which their romantic partner had recently helped or hindered their weight loss at four times over the course of 2 months. We conducted a content analysis of responses to identify themes of partner facilitation (Research Question 1 [RQ1]) and partner interference (RQ2) in individuals’ weight loss goals. Results revealed seven themes of partner facilitation: (a) partner enabling diet, (b) motivation and encouragement, (c) emotional support and positive reinforcement, (d) exercising together, (e) partner enabling exercise, (f) dieting together, and (g) relationship influence and priorities. Four themes of partner interference emerged in the data: (a) inability to plan for healthy meals, (b) inability to control the food environment, (c) preventing or discouraging exercise, and (d) emotional or relational discouragement.Peer reviewe
A interação texto/imagem em duas traduções de Flicts para o inglês
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Estudos da Tradução, Florianópolis, 2013.Abstract : This study aims to investigate two translations of FLICTS, first children's book written by Ziraldo and first full-colored album for children produced in Brazil, with a view to discussing the different interactions between text and image that might occur within the translation of children's literature. Considered a landmark in Brazilian Children's Literature since its launch in 1969, its British version was translated by Silvia Caruana and published by the publishing house Roger Schlesinger in 1973 and its American English version was translated by Daniela Pinto, originally published by Melbooks in 1984 - subsequently also published by Editora Melhoramentos and commercialized in Brazil. The theoretical framework informing the study is based on the interface of Descriptive Translation Studies, Translation of Children's Literature and the Grammar of Visual Design. By the analyses of a multimodal corpus and a dossier about the history of this printed book, it was possible to note that the several changes along FLICTS publishing history have made up other possible readings on this work
Groundwater resources of the Harney Basin, southeastern Oregon
No full textReport -- Plate 1. Location of Selected Geographic Features, Wells, Springs, Streamgaging Stations, Section Traces, and Sampling Locations, Harney Basin, Southeastern Oregon -- Plate 2. Water-Table Contour Map, 2018, Harney Basin, Southeastern Oregon -- Plate 3. Water-Level Contour Map for Wells Greater than 100 Feet Deep, 2018, Harney Basin, Southeastern Oregon.by Stephen B. Gingerich, Henry M. Johnson, Darrick E. Boschmann, Gerald H. Grondin, and C. Amanda Garcia ; prepared in cooperation with the Oregon Water Resources Department.Title from PDF title page (viewed on May 2, 2022).This archived document is maintained by the State Library of Oregon. It is for informational purposes and may not be suitable for legal purposes.Includes bibliographical references.Mode of access: Internet from the State Library of Oregon U.S. Government Publications Collection.Text in English
In conversation with M.G.Leanord
No full textVerity Jones and Amanda Webber caught up with M. G. Leonard, author of Beetle Boy, to talk about why getting the science right in children’s fiction is so important and how this book might inspire an interest in understanding and protecting insects
Citation for author's submitted version Citation for publisher's version
No full text. Quantitative PCR confirms culture as the gold standard for detection of lower airway infection by nontypeable Haemophilus influenzae in Australian Indigenous children with bronchiectasis. Retrieved from http://espace.cdu.edu.au/view/cdu:38464 Citation for publisher's version Hare, Kim M., Marsh, Robyn Leanne, Binks, Michael John, Grimwood, Keith, Pizzutto, Susan, Leach, Amanda, Chang, Anne Bernadette and Smith-Vaughan, Heidi (201
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