Search

Search Results

• 901. [Article] IDENTIFYING PERINATAL PREDICTORS OF DISORGANIZED INFANT-MOTHER ATTACHMENT: AN IMPORTANT STEP TOWARD CONNECTING FAMILIES WITH APPROPRIATE EARLY INTERVENTIONS

  Four decades of research demonstrates that infant-caregiver attachment has important implications for subsequent socio-emotional functioning, with attachment security predictive of a wide range of positive ...

  Citation × Citation Citation Abstract Copy Title: IDENTIFYING PERINATAL PREDICTORS OF DISORGANIZED INFANT-MOTHER ATTACHMENT: AN IMPORTANT STEP TOWARD CONNECTING FAMILIES WITH APPROPRIATE EARLY INTERVENTIONS Author: Bernstein, Rosemary Year: 2016 Four decades of research demonstrates that infant-caregiver attachment has important implications for subsequent socio-emotional functioning, with attachment security predictive of a wide range of positive outcomes, and attachment insecurity—and the insecure-disorganized pattern in particular—predictive of later difficulties. This early risk can be ameliorated with early prevention, yet effective prevention depends on a more thorough understanding of the etiology of attachment disorganization. Because measures of caregiver behaviors shown to predict infant-caregiver attachment yield modest to moderate effect sizes, some researchers have suggested the field refocus on understanding the caregiver cognitive processes that underlie infant-caregiver attachment. In an effort to better understand these cognitive mechanisms underlying the development of infant-caregiver attachment disorganization, a previous study by the current author found that compared to women who go on to have a secure attachment relationship with their infant, those who go on to have a disorganized attachment relationship identified more infant faces as expressing anger and fewer as expressing sadness. The current study aimed to expand on this research linking specific patterns of caregiver recognition of negative infant affect with subsequent caregiver-infant attachment outcomes. More specifically, I expected the above findings would generalize to a postnatal (non-exclusively primiparous) sample. I also tested whether these hypothesized effects were unique or overlapping with two existing predictors of attachment—i.e. the Caregiving Helplessness Questionnaire (George and Solomon, 2011) and Adult Attachment Interview (George, Kaplan, & Main, 1985). Counter to hypotheses, I did not find that maternal recognition of infant anger or sadness predicted infant-mother attachment. I did, however, find that maternal helplessness predicted attachment categorization, and that compared to the mothers who went on to have secure attachment relationships with their infants, those who went on to have disorganized attachment relationships labeled more ambiguous infant faces as surprised. The other two facets of caregiver helplessness (caregiver and child fright and child caregiving) and overall unresolved State of Mind scores did not significantly predict infant-caregiver attachment outcomes, nor did adding these predictors to a model including emotion recognition predictors change the pattern of results. Limitations that may explain these null results and future directions are discussed. Title: IDENTIFYING PERINATAL PREDICTORS OF DISORGANIZED INFANT-MOTHER ATTACHMENT: AN IMPORTANT STEP TOWARD CONNECTING FAMILIES WITH APPROPRIATE EARLY INTERVENTIONS Author: Bernstein, Rosemary Year: 2016 Four decades of research demonstrates that infant-caregiver attachment has important implications for subsequent socio-emotional functioning, with attachment security predictive of a wide range of positive outcomes, and attachment insecurity—and the insecure-disorganized pattern in particular—predictive of later difficulties. This early risk can be ameliorated with early prevention, yet effective prevention depends on a more thorough understanding of the etiology of attachment disorganization. Because measures of caregiver behaviors shown to predict infant-caregiver attachment yield modest to moderate effect sizes, some researchers have suggested the field refocus on understanding the caregiver cognitive processes that underlie infant-caregiver attachment. In an effort to better understand these cognitive mechanisms underlying the development of infant-caregiver attachment disorganization, a previous study by the current author found that compared to women who go on to have a secure attachment relationship with their infant, those who go on to have a disorganized attachment relationship identified more infant faces as expressing anger and fewer as expressing sadness. The current study aimed to expand on this research linking specific patterns of caregiver recognition of negative infant affect with subsequent caregiver-infant attachment outcomes. More specifically, I expected the above findings would generalize to a postnatal (non-exclusively primiparous) sample. I also tested whether these hypothesized effects were unique or overlapping with two existing predictors of attachment—i.e. the Caregiving Helplessness Questionnaire (George and Solomon, 2011) and Adult Attachment Interview (George, Kaplan, & Main, 1985). Counter to hypotheses, I did not find that maternal recognition of infant anger or sadness predicted infant-mother attachment. I did, however, find that maternal helplessness predicted attachment categorization, and that compared to the mothers who went on to have secure attachment relationships with their infants, those who went on to have disorganized attachment relationships labeled more ambiguous infant faces as surprised. The other two facets of caregiver helplessness (caregiver and child fright and child caregiving) and overall unresolved State of Mind scores did not significantly predict infant-caregiver attachment outcomes, nor did adding these predictors to a model including emotion recognition predictors change the pattern of results. Limitations that may explain these null results and future directions are discussed. Close

• 902. [Article] Measurement of Membrane Rigidity and Its Modulation by the Vesicle Trafficking Protein Sar1

  Sculpting membranes into dynamic, curved shapes is central to intracellular cargo trafficking and other cellular functions. However, generation of membrane curvature during trafficking involves lipids ...

  Citation × Citation Citation Abstract Copy Title: Measurement of Membrane Rigidity and Its Modulation by the Vesicle Trafficking Protein Sar1 Author: Loftus, Andrew Year: 2014 Sculpting membranes into dynamic, curved shapes is central to intracellular cargo trafficking and other cellular functions. However, generation of membrane curvature during trafficking involves lipids and membrane-associated proteins; current mechanisms focus on creating rigid cages, curved scaffolds, or membrane surface area changes by proteins. This dissertation provides an alternative mechanistic example for the control of membrane deformations, involving modulation of membrane material properties. Sar1, a GTPase of the COPII family, regulates vesicle trafficking from the endoplasmic reticulum. We find that Sar1p lowers the rigidity of the lipid bilayer membrane to which it binds. We examine the behavior of Saccharomyces cerevisiae Sar1 (Sar1p) and Homo sapiens paralogs of Sar1 (Sar1A and Sar1B). Like Sar1p, human Sar1s lower membrane rigidity. Unlike Sar1p, the rigidity is not a monotonically decreasing function of concentration. At high concentrations, we find increased bending rigidity and decreased protein mobility. These features imply a model in which human Sar1 clustering governs membrane mechanical properties. Membrane rigidity measurements remain rare, however, and show a large variance, a situation that can be addressed by improving techniques and comparing disparate techniques applied to the same systems. I introduce applying selective plane illumination microscopy (SPIM) to image thermal fluctuations of giant vesicles. SPIM's optical sectioning enables high-speed fluorescence imaging of freely suspended vesicles and quantification of edge localization precision, yielding robust fluctuation spectra and rigidity estimates. For lipid-only membranes and membranes bound by the intracellular trafficking protein Sar1p, we show rigidity values from giant unilamellar vesicle fluctuations in close agreement with those derived from our independent assay based on membrane tether pulling. We also show that a model of homogeneous quasi-spherical vesicles poorly fits fluctuation spectra of vesicles bound by Sar1A at high concentrations, suggesting that SPIM-based analysis can offer insights into spatially inhomogeneous properties. I conclude by discussing our current work on amphipathic alpha helices, their ability to reduce membrane rigidity, and our hopes to create artificial helical structures capable of mimicking trafficking systems. Supplemental videos represent membrane disintegration with Sar1p and fluctuations of membrane only and Sar1p incubated vesicles. This dissertation contains previously published co-authored material. Title: Measurement of Membrane Rigidity and Its Modulation by the Vesicle Trafficking Protein Sar1 Author: Loftus, Andrew Year: 2014 Sculpting membranes into dynamic, curved shapes is central to intracellular cargo trafficking and other cellular functions. However, generation of membrane curvature during trafficking involves lipids and membrane-associated proteins; current mechanisms focus on creating rigid cages, curved scaffolds, or membrane surface area changes by proteins. This dissertation provides an alternative mechanistic example for the control of membrane deformations, involving modulation of membrane material properties. Sar1, a GTPase of the COPII family, regulates vesicle trafficking from the endoplasmic reticulum. We find that Sar1p lowers the rigidity of the lipid bilayer membrane to which it binds. We examine the behavior of Saccharomyces cerevisiae Sar1 (Sar1p) and Homo sapiens paralogs of Sar1 (Sar1A and Sar1B). Like Sar1p, human Sar1s lower membrane rigidity. Unlike Sar1p, the rigidity is not a monotonically decreasing function of concentration. At high concentrations, we find increased bending rigidity and decreased protein mobility. These features imply a model in which human Sar1 clustering governs membrane mechanical properties. Membrane rigidity measurements remain rare, however, and show a large variance, a situation that can be addressed by improving techniques and comparing disparate techniques applied to the same systems. I introduce applying selective plane illumination microscopy (SPIM) to image thermal fluctuations of giant vesicles. SPIM's optical sectioning enables high-speed fluorescence imaging of freely suspended vesicles and quantification of edge localization precision, yielding robust fluctuation spectra and rigidity estimates. For lipid-only membranes and membranes bound by the intracellular trafficking protein Sar1p, we show rigidity values from giant unilamellar vesicle fluctuations in close agreement with those derived from our independent assay based on membrane tether pulling. We also show that a model of homogeneous quasi-spherical vesicles poorly fits fluctuation spectra of vesicles bound by Sar1A at high concentrations, suggesting that SPIM-based analysis can offer insights into spatially inhomogeneous properties. I conclude by discussing our current work on amphipathic alpha helices, their ability to reduce membrane rigidity, and our hopes to create artificial helical structures capable of mimicking trafficking systems. Supplemental videos represent membrane disintegration with Sar1p and fluctuations of membrane only and Sar1p incubated vesicles. This dissertation contains previously published co-authored material. Close

• 903. [Article] A Longitudinal Examination of the Relationships among Disadvantaged Neighborhoods, Supervision, Peer Associations, and Patterns of Ethnic Minority Adolescent Substance Use

  The primary purpose of this study was to utilize an ecological-transactional theoretical framework and an existing longitudinal data set to examine the relationships among neighborhood context, family ...

  Citation × Citation Citation Abstract Copy Title: A Longitudinal Examination of the Relationships among Disadvantaged Neighborhoods, Supervision, Peer Associations, and Patterns of Ethnic Minority Adolescent Substance Use Author: Burt, Michelle Year: 2012, 2014 The primary purpose of this study was to utilize an ecological-transactional theoretical framework and an existing longitudinal data set to examine the relationships among neighborhood context, family supervision, association with deviant peers, and patterns of substance use during adolescence. Participants included 821 youth from the Longitudinal Cohort Study of the Project on Human Development in Chicago Neighborhoods (PHDCN) data set. Data include primary caregiver and youth self-report measures of adult supervision, peer associations, and substance use. Data also include community survey and systematic social observation measures of neighborhood social processes such as collective efficacy, social disorder and social capital, neighborhood disadvantage, policing, and perceived danger collected from 1994-2001 in the city of Chicago. Latent growth curve modeling analyses were used to answer the research questions. Study results were significant associations between neighborhood social processes and substance use. Contrary to previous findings, more positive neighborhood social processes were related to higher levels of substance use for females. For both the African American/Black and Hispanic/Latino groups, deviant peer associations were related to higher levels of substance use at age 12. For the Hispanic/Latino group, higher neighborhood socioeconomic status was related to greater increases in substance use over time. Study results suggest the continued importance of research to discover sex and ethnic variation in associations among contextual influences and adolescent substance use. The current study makes a significant contribution to extant literature by examining the influence of neighborhood social processes, deviant peer associations, and supervision on substance use trajectories. Including peers, parental, and neighborhood factors&mdashin one model&mdashprovided a more comprehensive examination of how contextual influences impact the development of adolescent substance use. In addition, using a multilevel analysis with a diverse, longitudinal data set provided further insights into understanding ethnic and gender variation in the development of adolescents' substance use. Supplemental files include description of PHDCN scale items, HOME measure, Deviance of Peers measure, and items from the Substance Use Interview. Title: A Longitudinal Examination of the Relationships among Disadvantaged Neighborhoods, Supervision, Peer Associations, and Patterns of Ethnic Minority Adolescent Substance Use Author: Burt, Michelle Year: 2012, 2014 The primary purpose of this study was to utilize an ecological-transactional theoretical framework and an existing longitudinal data set to examine the relationships among neighborhood context, family supervision, association with deviant peers, and patterns of substance use during adolescence. Participants included 821 youth from the Longitudinal Cohort Study of the Project on Human Development in Chicago Neighborhoods (PHDCN) data set. Data include primary caregiver and youth self-report measures of adult supervision, peer associations, and substance use. Data also include community survey and systematic social observation measures of neighborhood social processes such as collective efficacy, social disorder and social capital, neighborhood disadvantage, policing, and perceived danger collected from 1994-2001 in the city of Chicago. Latent growth curve modeling analyses were used to answer the research questions. Study results were significant associations between neighborhood social processes and substance use. Contrary to previous findings, more positive neighborhood social processes were related to higher levels of substance use for females. For both the African American/Black and Hispanic/Latino groups, deviant peer associations were related to higher levels of substance use at age 12. For the Hispanic/Latino group, higher neighborhood socioeconomic status was related to greater increases in substance use over time. Study results suggest the continued importance of research to discover sex and ethnic variation in associations among contextual influences and adolescent substance use. The current study makes a significant contribution to extant literature by examining the influence of neighborhood social processes, deviant peer associations, and supervision on substance use trajectories. Including peers, parental, and neighborhood factors&mdashin one model&mdashprovided a more comprehensive examination of how contextual influences impact the development of adolescent substance use. In addition, using a multilevel analysis with a diverse, longitudinal data set provided further insights into understanding ethnic and gender variation in the development of adolescents' substance use. Supplemental files include description of PHDCN scale items, HOME measure, Deviance of Peers measure, and items from the Substance Use Interview. Close

• 904. [Article] Guiding the Work of Professional Learning Communities: Perspectives for School Leaders

  Professional Learning Communities (PLCs) are groups of educators committed to working collaboratively in ongoing processes of collective inquiry and action research to achieve better results for the students ...

  Citation × Citation Citation Abstract Copy Title: Guiding the Work of Professional Learning Communities: Perspectives for School Leaders Author: Draper, Daniel Paul Year: 2014 Professional Learning Communities (PLCs) are groups of educators committed to working collaboratively in ongoing processes of collective inquiry and action research to achieve better results for the students they serve. PLCs operate under the assumption that the key to improved learning for students is continuous job-embedded learning for educators (DuFour, DuFour, Eaker, & Many, 2006). Researchers and practitioners agree that PLCs are critical to the overall success of schools. The problem is that implementing PLCs with fidelity to an inquiry process is a real challenge. Most school districts do not have a systematic or comprehensive approach to guide their PLC process. School leaders are in need of quality tools and resources to assist them in implementing PLCs. As a possible solution to this problem, a design team of four Estacada School District principals and one vice principal was convened to create, field-test and refine a handbook for PLC leadership. The handbook was field-tested in four schools and evaluated to determine its usefulness. The study's primary research questions were: (a) Is the PLC handbook a useful resource for school leaders? and (b) What are the handbook's strengths and weaknesses? Secondary research questions focused on specific topics and sections of the handbook: (a) How do school leaders organize and support a PLC framework? (b) How can PLCs support school change initiatives? (c) How can PLCs gather and analyze student data? (d) How can PLCs plan for future action? and (e) How can PLCs troubleshoot challenges? The design team relied on a problem-based learning approach (Bridges & Hallinger, 1995) and the use of a research and development process (Borg & Gall, 1989) to design an educational product ready for operational use in their schools. The design team met weekly for regularly scheduled meetings. They used the Critical Friends Consultancy Protocol (Harmony Education Center, 2013) as a systematic way to problem solve and collect qualitative data. The data collected from these sessions were transcribed, coded for themes, and analyzed. Other data sources that were used included the review of institutional documentation, structured interviews with teacher leaders, and survey results. The design team then refined its PLC handbook through the first seven steps of the research and development process: (a) Research and information collecting; (b) Planning objectives, learning activities, and small scale testing; (c) Developing a preliminary form of the product; (d) Preliminary field-testing; (e) Main product revision; (f) Main field-testing; and (g) Operational product revision. The design team determined that the handbook was in fact a useful resource for school leaders, and it helped move PLC work forward in each of the four schools. The team found that the handbook had a number of strengths, including the clarification of key terminology and the establishment of a common language for PLCs. Another noted strength was that the activities included in the handbook were user-friendly. A noted opportunity was that the field-tested handbook did not create viable ways to involve parents, families, and community members in PLC work alongside educators. This opportunity is being addressed by the design team in future handbook revisions. The handbook helped school leaders organize and support a PLC framework. The design team confirmed that the handbook assisted PLCs in completing the work required of major school change initiatives, including Differentiated Instruction/Sheltered Instruction, Response to Intervention/Positive Behavioral Intervention Support, Common Core State Standards, and Proficiency-Based Learning. The design team also found the PLC handbook to be useful as an orientation tool for new staff members, as well as a valuable review tool for PLC veterans, particularly regarding how to collect and analyze student assessment data. The handbook also helped PLCs plan future action relative to providing intervention and enrichment opportunities for students. Finally, the handbook provided tools to help educators troubleshoot challenges that surfaced during their PLC work. The design team will continue to refine its handbook and provide support for the Estacada School District and community as mutually-beneficial PLC-related activities, grants, and projects are pursued. The optimal next step for future use of the handbook would be for several schools and districts throughout Oregon, particularly from small, rural areas, to pilot the handbook. The piloting schools and districts could then share the roadblocks and success stories pertinent to their use of the handbook, which would in turn support the design team in making a quality final product revision. Title: Guiding the Work of Professional Learning Communities: Perspectives for School Leaders Author: Draper, Daniel Paul Year: 2014 Professional Learning Communities (PLCs) are groups of educators committed to working collaboratively in ongoing processes of collective inquiry and action research to achieve better results for the students they serve. PLCs operate under the assumption that the key to improved learning for students is continuous job-embedded learning for educators (DuFour, DuFour, Eaker, & Many, 2006). Researchers and practitioners agree that PLCs are critical to the overall success of schools. The problem is that implementing PLCs with fidelity to an inquiry process is a real challenge. Most school districts do not have a systematic or comprehensive approach to guide their PLC process. School leaders are in need of quality tools and resources to assist them in implementing PLCs. As a possible solution to this problem, a design team of four Estacada School District principals and one vice principal was convened to create, field-test and refine a handbook for PLC leadership. The handbook was field-tested in four schools and evaluated to determine its usefulness. The study's primary research questions were: (a) Is the PLC handbook a useful resource for school leaders? and (b) What are the handbook's strengths and weaknesses? Secondary research questions focused on specific topics and sections of the handbook: (a) How do school leaders organize and support a PLC framework? (b) How can PLCs support school change initiatives? (c) How can PLCs gather and analyze student data? (d) How can PLCs plan for future action? and (e) How can PLCs troubleshoot challenges? The design team relied on a problem-based learning approach (Bridges & Hallinger, 1995) and the use of a research and development process (Borg & Gall, 1989) to design an educational product ready for operational use in their schools. The design team met weekly for regularly scheduled meetings. They used the Critical Friends Consultancy Protocol (Harmony Education Center, 2013) as a systematic way to problem solve and collect qualitative data. The data collected from these sessions were transcribed, coded for themes, and analyzed. Other data sources that were used included the review of institutional documentation, structured interviews with teacher leaders, and survey results. The design team then refined its PLC handbook through the first seven steps of the research and development process: (a) Research and information collecting; (b) Planning objectives, learning activities, and small scale testing; (c) Developing a preliminary form of the product; (d) Preliminary field-testing; (e) Main product revision; (f) Main field-testing; and (g) Operational product revision. The design team determined that the handbook was in fact a useful resource for school leaders, and it helped move PLC work forward in each of the four schools. The team found that the handbook had a number of strengths, including the clarification of key terminology and the establishment of a common language for PLCs. Another noted strength was that the activities included in the handbook were user-friendly. A noted opportunity was that the field-tested handbook did not create viable ways to involve parents, families, and community members in PLC work alongside educators. This opportunity is being addressed by the design team in future handbook revisions. The handbook helped school leaders organize and support a PLC framework. The design team confirmed that the handbook assisted PLCs in completing the work required of major school change initiatives, including Differentiated Instruction/Sheltered Instruction, Response to Intervention/Positive Behavioral Intervention Support, Common Core State Standards, and Proficiency-Based Learning. The design team also found the PLC handbook to be useful as an orientation tool for new staff members, as well as a valuable review tool for PLC veterans, particularly regarding how to collect and analyze student assessment data. The handbook also helped PLCs plan future action relative to providing intervention and enrichment opportunities for students. Finally, the handbook provided tools to help educators troubleshoot challenges that surfaced during their PLC work. The design team will continue to refine its handbook and provide support for the Estacada School District and community as mutually-beneficial PLC-related activities, grants, and projects are pursued. The optimal next step for future use of the handbook would be for several schools and districts throughout Oregon, particularly from small, rural areas, to pilot the handbook. The piloting schools and districts could then share the roadblocks and success stories pertinent to their use of the handbook, which would in turn support the design team in making a quality final product revision. Close

• 905. [Article] Sampling Fish: A Case Study from the Čḯxwicən Site, Northwest Washington

  Researchers on the Northwest Coast (NWC) are often interested in complex questions regarding social organization, resource intensification, resource control, and impacts of environmental change on resources ...

  Citation × Citation Citation Abstract Copy Title: Sampling Fish: A Case Study from the Čḯxwicən Site, Northwest Washington Author: Syvertson, Laura Maye Year: 2017 Researchers on the Northwest Coast (NWC) are often interested in complex questions regarding social organization, resource intensification, resource control, and impacts of environmental change on resources and in turn human groups. However, the excavation strategies used on the NWC often do not provide the spatial and chronological control within a site that is necessary to document their variability and answer these research questions. The Čḯxwicən site has the potential to address some of the limitations of previous Northwest Coast village site excavations because of its unique and robust sampling strategy, the wide expanse of time that it was occupied, and the multiple house structures present. An on-going project is examining changing human ecodynamics over the breadth of site occupation, focusing on zooarchaeology and geoarchaeological records. This site, located on the Strait of Juan de Fuca in Port Angeles, WA was excavated in 2004 as part of a Washington State Department of Transportation (WSDOT) undertaking to build parts for the Hood Canal Bridge Large scale excavation (261.4 m3 528 m2) generated enormous quantities of faunal remains. Radiocarbon dates and historic records show occupation extends from 2750 cal. BP to the early 20th century. Statistical sampling methods provide an empirical way to maximize the amount of information obtained with the least amount of effort. My thesis addressed the utility of Sampling to Redundancy (STR) as a statistical sampling method for sampling faunal remains from large village sites. My project has documented the variability of fish family representation across time and space in one part of the Čḯxwicən village, while minimizing the time and effort required to do so. This thesis applies STR to "S" (> 1/4 in.) 10 Liter bucket samples from eight excavation units and a total of 26 separate unique temporal and spatial contexts. I focused on 1/ 4 in. samples for my study for a particular reason. Previous fish faunal studies have focused on effects of mesh size on fish representation; and emphasized the need to use fine mesh (e.g., 1/ 8 in. or finer) to document small-bodied fishes. This focus on fine mesh typically means that only limited volumes of matrix are studied, which in turn may mean that remains of rarer, large- bodied fishes are under- represented. The on-going research project has focused on buckets screened to 1/ 8 in. mesh (called "C" buckets). I used STR to sample additional volumes of matrix screened to 1/ 4 in. to examine whether expanding the volume studied would affect fish representation, which was a second goal of my project. Overall, I studied remains from 269 "S" buckets out of a total of 419 buckets, or 47% of the buckets. STR was most helpful for six of the high bone abundance and density contexts, where I analyzed less than 50% of the total buckets, was moderately helpful for 14 contexts, and not at all helpful for the six contexts with low fishbone abundance, where I analyzed 100% of the buckets. This analysis took me a total of 154 hours, and based on the percentage of material analyzed, 174 hours were saved. As to the second project goal, to assess whether adding fish remains documented from additional matrix volume affected fish representation, I found the differences were minimal. Both for my study units as a whole, and for each time period, adding the fish records from the "S" buckets did not alter the main trends in fish representation as documented by the larger study, using a smaller volume. To further examine whether the added volume from >1/ 4 in "S" buckets affected results, I explored specific research questions that are relevant to the larger project regarding environment-animal interactions and fishbone deposition and bone condition inside and outside of a house structure. Adding the "S" bucket samples did not affect fish representation or fishbone distribution and condition, which affirms that the sampling strategy used in the larger research project was sufficient in most cases to characterize the fish record at the site. My approach to STR has focused on fish remains that were previously excavated from a Pacific coastal village site with dense archaeological deposits. STR could be employed in other types of archaeological settings in a range of environments (coast or interior) representing a range of cultural contexts (from hunting camps to urban centers) to establish sample redundancy after an excavation is complete. STR could be used during on-going excavation. Further research is required to explore the implications of STR in these settings, however it is likely that the success of STR in other contexts will be dependent on the density and overall abundance of remains, the diversity or material types being studied, as well of course in the range and specificity of questions in each case. Title: Sampling Fish: A Case Study from the Čḯxwicən Site, Northwest Washington Author: Syvertson, Laura Maye Year: 2017 Researchers on the Northwest Coast (NWC) are often interested in complex questions regarding social organization, resource intensification, resource control, and impacts of environmental change on resources and in turn human groups. However, the excavation strategies used on the NWC often do not provide the spatial and chronological control within a site that is necessary to document their variability and answer these research questions. The Čḯxwicən site has the potential to address some of the limitations of previous Northwest Coast village site excavations because of its unique and robust sampling strategy, the wide expanse of time that it was occupied, and the multiple house structures present. An on-going project is examining changing human ecodynamics over the breadth of site occupation, focusing on zooarchaeology and geoarchaeological records. This site, located on the Strait of Juan de Fuca in Port Angeles, WA was excavated in 2004 as part of a Washington State Department of Transportation (WSDOT) undertaking to build parts for the Hood Canal Bridge Large scale excavation (261.4 m3 528 m2) generated enormous quantities of faunal remains. Radiocarbon dates and historic records show occupation extends from 2750 cal. BP to the early 20th century. Statistical sampling methods provide an empirical way to maximize the amount of information obtained with the least amount of effort. My thesis addressed the utility of Sampling to Redundancy (STR) as a statistical sampling method for sampling faunal remains from large village sites. My project has documented the variability of fish family representation across time and space in one part of the Čḯxwicən village, while minimizing the time and effort required to do so. This thesis applies STR to "S" (> 1/4 in.) 10 Liter bucket samples from eight excavation units and a total of 26 separate unique temporal and spatial contexts. I focused on 1/ 4 in. samples for my study for a particular reason. Previous fish faunal studies have focused on effects of mesh size on fish representation; and emphasized the need to use fine mesh (e.g., 1/ 8 in. or finer) to document small-bodied fishes. This focus on fine mesh typically means that only limited volumes of matrix are studied, which in turn may mean that remains of rarer, large- bodied fishes are under- represented. The on-going research project has focused on buckets screened to 1/ 8 in. mesh (called "C" buckets). I used STR to sample additional volumes of matrix screened to 1/ 4 in. to examine whether expanding the volume studied would affect fish representation, which was a second goal of my project. Overall, I studied remains from 269 "S" buckets out of a total of 419 buckets, or 47% of the buckets. STR was most helpful for six of the high bone abundance and density contexts, where I analyzed less than 50% of the total buckets, was moderately helpful for 14 contexts, and not at all helpful for the six contexts with low fishbone abundance, where I analyzed 100% of the buckets. This analysis took me a total of 154 hours, and based on the percentage of material analyzed, 174 hours were saved. As to the second project goal, to assess whether adding fish remains documented from additional matrix volume affected fish representation, I found the differences were minimal. Both for my study units as a whole, and for each time period, adding the fish records from the "S" buckets did not alter the main trends in fish representation as documented by the larger study, using a smaller volume. To further examine whether the added volume from >1/ 4 in "S" buckets affected results, I explored specific research questions that are relevant to the larger project regarding environment-animal interactions and fishbone deposition and bone condition inside and outside of a house structure. Adding the "S" bucket samples did not affect fish representation or fishbone distribution and condition, which affirms that the sampling strategy used in the larger research project was sufficient in most cases to characterize the fish record at the site. My approach to STR has focused on fish remains that were previously excavated from a Pacific coastal village site with dense archaeological deposits. STR could be employed in other types of archaeological settings in a range of environments (coast or interior) representing a range of cultural contexts (from hunting camps to urban centers) to establish sample redundancy after an excavation is complete. STR could be used during on-going excavation. Further research is required to explore the implications of STR in these settings, however it is likely that the success of STR in other contexts will be dependent on the density and overall abundance of remains, the diversity or material types being studied, as well of course in the range and specificity of questions in each case. Close

• 906. [Article] Breaking Barriers to Bike Share: Insights from Residents of Traditionally Underserved Neighborhoods

  Evidence has shown that higher income and white populations are overrepresented in both access to and use of bike share. Efforts to overcome underserved communities’ barriers to access and use of bike ...

  Citation × Citation Citation Abstract Copy Title: Breaking Barriers to Bike Share: Insights from Residents of Traditionally Underserved Neighborhoods Author: McNeil, Nathan, Dill, Jennifer, MacArthur, John, Broach, Joseph, Howland, Steven Year: 2017 Evidence has shown that higher income and white populations are overrepresented in both access to and use of bike share. Efforts to overcome underserved communities’ barriers to access and use of bike share have been initiated in a number of cities, including those working with the Better Bike Share Partnership (BBSP) to launch and test potentially replicable approaches to improve the equity outcomes. This report describes findings from a survey of residents living near bike share stations placed in underserved communities of select BBSP cities: Philadelphia, Chicago, and Brooklyn. These were neighborhoods targeted for focused outreach related to BBSP programs, and were majority-minority (79- 94% people of color) and lower-income (36-61% of households under 150% of the poverty level). Residents were also surveyed in control areas that did not receive BBSP targeted outreach in two of the cities. The research team mailed surveys to 6,000 residents in each city, and received 1,885 responses. Respondents closely matched area demographics on race/ethnicity and income in most study locations, but were somewhat more likely to be women, older and more highly educated. Findings are drawn primarily from an analysis of data from adults in the BBSP outreach areas under 65 years old and physically able to ride a bicycle. Of those respondents who provided race and income information (n=779), 42% were lower-income (defined as 300% of poverty or below) people of color, 27% were higher-income (above 300% of poverty) people of color, 6% were lower-income and white (not Hispanic), and 25% were higher-income and white. Race and income often influenced responses to bicycling and bike share in different ways. Differences in behavior and opinions sometimes correlated with income, sometimes with race, and sometimes with race and income combined. Both people of color and lower-income residents cited more barriers to bicycling generally and to using bike share than did higher-income white residents. The biggest barrier to bicycling generally is concern about traffic safety, regardless of race or income (cited as a big barrier by 48% of residents). For some, personal safety is also a concern. For example, 22% of lower-income people of color stated that a big barrier to riding was that doing so could cause them to be harassed or a victim of crime. Some of the most common barriers to bicycling cited by lower-income people of color were issues that bike share could address, such as: not having a bike or related gear (47%); not having a safe place to leave a bike where they need to go (36%); the expense of buying a bike or related gear (41%); and not having a safe place to store a bike at home (32%). High costs of membership and concerns about liability for the bicycle were big barriers to using bike share for about half of lower-income respondents (48% and 52% respectively), compared to 33% and 31% of higher-income respondents of color and only 18% and 10% of higherincome white respondents. Another set of barriers relates to knowledge, lack of knowledge or incorrect knowledge. Only 31% of all respondents knew the details about the availability of the reduced-price membership or pass option, and 34% of lower-income respondents of color said that not knowing enough about how to use bike share was a big barrier to using it, compared to 19% of higher-income respondents of color and 7% of higher-income white residents. Among potential program changes, lower-income people of color were significantly more likely than other respondents to indicate that certain changes would make them more likely to use bike share, including: several changes that could help with cost and liability concerns such as discounted membership or use options (80% stating somewhat or much more likely to use bike share with this change), access to free or low-cost helmets/gear (72%), and easier ways to pay with cash (67%); and several changes to help overcome knowledge or experience gaps, such as help finding safe ways to get where I need to go (70%), and organized rides for people like me (71%). Respondents generally have positive attitudes about bicycling and bike share. A large majority of all residents (73%) and lower-income people of color (74%) agreed that the city’s bike share system “is useful for people like me.” In terms of reasons for using bike share, getting exercise was cited by 71% of the lower-income respondents of color as a reason they would consider using bike share, a rate much higher than other respondent groups. Being able to ride with friends and family was cited by 48% of lower-income respondents of color, again higher than other groups. Title: Breaking Barriers to Bike Share: Insights from Residents of Traditionally Underserved Neighborhoods Author: McNeil, Nathan, Dill, Jennifer, MacArthur, John, Broach, Joseph, Howland, Steven Year: 2017 Evidence has shown that higher income and white populations are overrepresented in both access to and use of bike share. Efforts to overcome underserved communities’ barriers to access and use of bike share have been initiated in a number of cities, including those working with the Better Bike Share Partnership (BBSP) to launch and test potentially replicable approaches to improve the equity outcomes. This report describes findings from a survey of residents living near bike share stations placed in underserved communities of select BBSP cities: Philadelphia, Chicago, and Brooklyn. These were neighborhoods targeted for focused outreach related to BBSP programs, and were majority-minority (79- 94% people of color) and lower-income (36-61% of households under 150% of the poverty level). Residents were also surveyed in control areas that did not receive BBSP targeted outreach in two of the cities. The research team mailed surveys to 6,000 residents in each city, and received 1,885 responses. Respondents closely matched area demographics on race/ethnicity and income in most study locations, but were somewhat more likely to be women, older and more highly educated. Findings are drawn primarily from an analysis of data from adults in the BBSP outreach areas under 65 years old and physically able to ride a bicycle. Of those respondents who provided race and income information (n=779), 42% were lower-income (defined as 300% of poverty or below) people of color, 27% were higher-income (above 300% of poverty) people of color, 6% were lower-income and white (not Hispanic), and 25% were higher-income and white. Race and income often influenced responses to bicycling and bike share in different ways. Differences in behavior and opinions sometimes correlated with income, sometimes with race, and sometimes with race and income combined. Both people of color and lower-income residents cited more barriers to bicycling generally and to using bike share than did higher-income white residents. The biggest barrier to bicycling generally is concern about traffic safety, regardless of race or income (cited as a big barrier by 48% of residents). For some, personal safety is also a concern. For example, 22% of lower-income people of color stated that a big barrier to riding was that doing so could cause them to be harassed or a victim of crime. Some of the most common barriers to bicycling cited by lower-income people of color were issues that bike share could address, such as: not having a bike or related gear (47%); not having a safe place to leave a bike where they need to go (36%); the expense of buying a bike or related gear (41%); and not having a safe place to store a bike at home (32%). High costs of membership and concerns about liability for the bicycle were big barriers to using bike share for about half of lower-income respondents (48% and 52% respectively), compared to 33% and 31% of higher-income respondents of color and only 18% and 10% of higherincome white respondents. Another set of barriers relates to knowledge, lack of knowledge or incorrect knowledge. Only 31% of all respondents knew the details about the availability of the reduced-price membership or pass option, and 34% of lower-income respondents of color said that not knowing enough about how to use bike share was a big barrier to using it, compared to 19% of higher-income respondents of color and 7% of higher-income white residents. Among potential program changes, lower-income people of color were significantly more likely than other respondents to indicate that certain changes would make them more likely to use bike share, including: several changes that could help with cost and liability concerns such as discounted membership or use options (80% stating somewhat or much more likely to use bike share with this change), access to free or low-cost helmets/gear (72%), and easier ways to pay with cash (67%); and several changes to help overcome knowledge or experience gaps, such as help finding safe ways to get where I need to go (70%), and organized rides for people like me (71%). Respondents generally have positive attitudes about bicycling and bike share. A large majority of all residents (73%) and lower-income people of color (74%) agreed that the city’s bike share system “is useful for people like me.” In terms of reasons for using bike share, getting exercise was cited by 71% of the lower-income respondents of color as a reason they would consider using bike share, a rate much higher than other respondent groups. Being able to ride with friends and family was cited by 48% of lower-income respondents of color, again higher than other groups. Close

• 907. [Article] Overcoming the Barriers to Micro-Housing: Tiny Houses, Big Potential

  74 pages

  Citation × Citation Citation Abstract Copy Title: Overcoming the Barriers to Micro-Housing: Tiny Houses, Big Potential Author: Brown, Emily Year: 2016 74 pages Title: Overcoming the Barriers to Micro-Housing: Tiny Houses, Big Potential Author: Brown, Emily Year: 2016 74 pages Close