Series of exercises in elaborative thinking in composition planning: narration, biography, description of people

Thesis (Ed.M.)--Boston Universit

Lead-210 and polonium-210 in pteropod and heteropod mollusc shells from the North Pacific: Evaluation of sample treatments and variation with shell size

Lead-210 activities in carefully cleaned size groups of pteropod and heteropod shells from the eastern equatorial Pacific were typically 0.3 dpm/g shell, similar to those reported in other biogenic calcium carbonates. However, 210Po activities were in excess of levels expected from the decay of shell-incorporated 210Pb, with (210Po/210Pb) activity ratios ranging from 20 to 28 in size-fractionated samples. Sample treatment procedures were examined using pteropod shells collected from diverse locations of the North Pacific. Possible sources of 210Po in excess of 210Pb in shells include inclusion of 210Po in the organic matrix during shell formation or adsorption of 210Po from the ambient water or nuclide-rich animal tissues. We predict that other CaCO3-precipitating organisms, including foraminifera, that have high surface/volume ratios and tissues in contact with carbonate surfaces, may also contain 210Po in excess of that supported by the decay of 210Pb. Variation in 210Pb activities measured in pteropod and heteropod shells suggests differences in the depth distributions for the species analyzed. Moreover, these results suggest ontogenetic migration in the pteropod Cavolinia longirostris. Pteropods and heteropods from regions in the equatorial Pacific were enriched 8–15 times with 210Pb relative to calcium, based on reported 210Pb activities in surface water and seawater calcium concentrations. Similarly, enrichment factors calculated for pteropod shells from the North Pacific transition zone and Subarctic Current were 13–20 times 210Pb levels in surface waters. Skeletal enrichment of 210Pb is higher in pteropods and heteropods than in corals by a factor of 3–10

The Effects of Postpartum Depression on Children\u27s Social Development

The increased incidence of postpartum depression has had significant effects on children’s social development. The purpose of this systematic review is to bring attention to the growing problem in such a vulnerable population. In addition, it was designed to shed light on the lack of research in this area of healthcare. The methods used to conduct the study include various peer reviewed, scholarly and evidenced based articles from databases such as Academic Search Complete, PsycNet, and Pubmed. Each article has been critically evaluated based on the following guidelines: a population group of children under the age of four, specifically maternal postpartum depression rather than paternal, and studies focused on childhood social development. The general consensus of the twenty articles conclude that maternal postpartum depression disrupts the social development of children. Specifically, decreased levels of attachment have been a common trend along with a developmental delay of communication. Based on the evidence collected during the systematic review future evidence-based practice should involve more rigorous screening of the mother child dyad in relation to promotion of mental health. How are children internationally, from birth to four years old, impacted by postpartum depression in relation to social development? Keywords: postpartum depression, development, social development, cognitive development, pediatrics, mental health, infan

Foraminiferal trace elements : uptake, diagenesis, and 100 m.y. paleochemical history

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.Microfiche copy available in Archives and ScienceVita.Includes bibliographies.by Margaret Lois Delaney.Ph.D

Bio-inspired systems: an exciting Vision for future autonomous biochemical sensing platforms

Through developments in 3D fabrication technologies in recent years, it is now possible to build and characterize much more sophisticated 3D platforms than was formerly the case. Regions of differing polarity, binding behaviour, flexibility/rigidity, can be incorporated into these fluidic systems. Furthermore, materials that can switch these characteristics can be incorporated, enabling the creation of microfluidic building blocks that exhibit switchable characteristics such as programmed microvehicle movement (chemotaxis), switchable binding and release, switchable soft polymer actuation (e.g. valving), and selective uptake and release of molecular targets. These building blocks can be in turn integrated into microfluidic systems with hitherto unsurpassed functionalities that can contribute to bridging the gap between what is required and what science can currently deliver for many challenging applications. The emerging transition from existing engineering-inspired 2D to bioinspired 3D fluidic concepts appears to represent a major turning point in the evolution of microfluidics. Implementation of these disruptive concepts may open the way to realising biochemical sensing systems with performance characteristics far beyond those of current devices. A key development will be the integration of biomimetic functions like self-awareness of condition and self-repair capabilities to extend their useful lifetime. In this lecture, I will present ideas and demonstrations of practical ways to begin building a bio-inspired functional toolbox that could form the basis of these futuristic biomimetic systems

Biomimetic microfluidics

Through developments in 3D fabrication technologies in recent years, we can now build and characterize much more sophisticated 3D platforms than was previously possible. We can create regions of differing polarity and hydrophobicity, mix passive and binding behaviours, and regions of differing flexibility/rigidity, hardness/softness. In addition, we can integrate materials that can switch between these characteristics, enabling the creation of biomimetic microfluidic building blocks that exhibit switchable characteristics such as programmed microvehicle movement (chemotaxis), switchable binding and release, switchable soft polymer actuation (e.g. valving), and detection. These building blocks can be in turn integrated into microfluidic systems with hitherto unsurpassed functionalities that can contribute to bridging the gap between what is required for many applications, and what we can currently deliver [1]. The emerging transition from existing engineering-inspired 2D to bioinspired 3D fluidic concepts represents a major turning point in the evolution of microfluidics. Implementation of these disruptive concepts may open the way to realise biochemical sensing systems with performance characteristics far beyond those of current devices. A key development will be the integration of biomimetic functions like self-awareness/self-diagnosis of condition and self-repair capabilities to extend their useful lifetime [2]. In this contribution, I will present ideas and demonstrations of practical ways to begin building a biomimetic function toolbox that could form the basis of futuristic microfluidic systems. Examples will include chemotactic microvehicles that can collaborate to perform sophisticated functions at specific locations [3] and precision control of flow behaviour in channels using light [4]. Strategies for creating high resolution (sub-200 nm) 3D soft-polymer responsive structures will be discussed. References [1] F. Benito-Lopez, R. Byrne, A.M. Răduţă, N.E. Vrana, G. McGuinness, D. Diamond, Ionogel-based light-actuated valves for controlling liquid flow in micro-fluidic manifolds, Lab Chip. 10 (2010) 195–201. doi:10.1039/B914709H. [2] L. Florea, K. Wagner, P. Wagner, G.G. Wallace, F. Benito-Lopez, D.L. Officer, D. Diamond, Photo-Chemopropulsion - Light-Stimulated Movement of Microdroplets, Advanced Materials. 26 (2014) 7339–7345. doi:10.1002/adma.201403007. [3] W. Francis, C. Fay, L. Florea, D. Diamond, Self-propelled chemotactic ionic liquid droplets, Chem. Commun. 51 (2015) 2342–2344. doi:10.1039/C4CC09214G. [4] C. Delaney, P. McCluskey, S. Coleman, J. Whyte, N. Kent, D. Diamond, Precision control of flow rate in microfluidic channels using photoresponsive soft polymer actuators, Lab Chip. 17 (2017) 2013–2021. doi:10.1039/C7LC00368D

Biomimetic microfluidics based on stimuli-responsive soft polymers

Through developments in 3D fabrication technologies in recent years, it is now possible to build and characterize much more sophisticated 3D platforms than was formerly the case. Regions of differing polarity, binding behaviour, flexibility/rigidity, can be incorporated into these fluidic systems. Furthermore, materials that can switch these characteristics can be incorporated, enabling the creation of microfluidic building blocks that exhibit switchable characteristics such as programmed microvehicle movement (chemotaxis), switchable binding and release, switchable soft polymer actuation (e.g. valving), and selective uptake and release of molecular targets. These building blocks can be in turn integrated into microfluidic systems with hitherto unsurpassed functionalities that can contribute to bridging the gap between what is required and what science can currently deliver for many challenging applications. The emerging transition from existing engineering-inspired 2D to bioinspired 3D fluidic concepts appears to represent a major turning point in the evolution of microfluidics. Implementation of these disruptive concepts may open the way to realising biochemical sensing systems with performance characteristics far beyond those of current devices. A key development will be the integration of biomimetic functions like self-awareness of condition and self-repair capabilities to extend their useful lifetime. In this contribution I will present ideas and demonstrations of practical ways to begin building a biomimetic function toolbox that could form the basis of these futuristic biomimetic systems

Nutrition and Social Eating Habits Among Seniors Living Independently

Background: Older adults have unique nutritional needs due to physiologic changes that occur as part of the normal aging process. Maintaining adequate nutrition has the potential to reduce morbidity and mortality related to chronic disease, fall risk, dementia and Alzheimer’s disease. Aging also poses an increased risk of isolation and lack of social interaction, particularly noted at meal times. Unintentional weight loss is an independent risk factor for early mortality. Social eating is related to higher food intake, and meal programs can improve nutritional risk for vulnerable seniors. We partnered with the Cathedral Square Corporation (CSC) to assess nutrition and social eating in residents at Heineberg Senior Housing in Burlington, VT and conducted focus groups to determine general nutritional concerns and evaluate potential interventions.https://scholarworks.uvm.edu/comphp_gallery/1033/thumbnail.jp

Students\u27 Perceptions of STEM Learning After Participating in a Summer Informal Learning Experience

Background: Informal learning environments increase students’ interest in STEM (e.g., Mohr‐Schroeder et al. School Sci Math 114: 291–301, 2014) and increase the chances a student will pursue a STEM career (Kitchen et al. Sci Educ 102: 529–547, 2018). The purpose of this study was to examine the impact of an informal STEM summer learning experience on student participants, to gain in-depth perspectives about how they felt this experience prepared them for their in-school mathematics and science classes as well as how it influenced their perception of STEM learning. Students’ attitudes and perceptions toward STEM are affected by their motivation, experience, and self-efficacy (Brown et al. J STEM Educ Innov Res 17: 27, 2016). The academic and social experiences students’ have are also important. Traditionally, formal learning is taught in a solitary form (Martin Science Education 88: S71–S82, 2004), while, informal learning is brimming with chances to connect and intermingle with peers (Denson et al. J STEM Educ: Innovations and Research 16: 11, 2015). Results: Informal learning environments increase students’ interest in STEM (e.g., Mohr‐Schroeder et al. School Sci Math 114: 291–301, 2014) and increase the chances a student will pursue a STEM career (Kitchen et al. Sci Educ 102: 529–547, 2018). The purpose of this study was to examine the impact of an informal STEM summer learning experience on student participants, to gain in-depth perspectives about how they felt this experience prepared them for their in-school mathematics and science classes as well as how it influenced their perception of STEM learning. Students’ attitudes and perceptions toward STEM are affected by their motivation, experience, and self-efficacy (Brown et al. J STEM Educ Innov Res 17: 27, 2016). The academic and social experiences students’ have are also important. Traditionally, formal learning is taught in a solitary form (Martin Science Education 88: S71–S82, 2004), while, informal learning is brimming with chances to connect and intermingle with peers (Denson et al. J STEM Educ: Innovations and Research 16: 11, 2015). Conclusions: By using authentic STEM workplaces, the STEM summer learning experience fostered a learning environment that extended and deepened STEM content learning while providing opportunity and access to content, settings, and materials that most middle level students otherwise would not have access to. Students also acknowledged the access they received to hands-on activities in authentic STEM settings and the opportunities they received to interact with STEM professionals were important components of the summer informal learning experience