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DTSTART;TZID=America/Los_Angeles:20250208T103000
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DTSTAMP:20260425T134450
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SUMMARY:DNA-mineral interactions at the molecular level: implications for bacterial evolution and ecological inference
DESCRIPTION:Prof. Karina Krarup Sand\, University of Copenhagen\nSponsored by Women Chemists Committee\, California ACS Section\n10:30 am-Noon\, Online\, Free\, Registration required | Download flyer\n\nAbstract: \n“Extracellular DNA (eDNA) in the environment degrades rapidly unless adsorbed onto minerals\, which enhances its stability. Currently there are vast amounts of DNA molecules preserved in our sediments. This mineral-bound DNA\, although widely used to study past ecosystems\, also poses significant implications for bacterial gene acquisition. By utilizing interfacial geochemistry\, molecular level and bacterial approaches\, this study explores (1) the role of mineral surfaces in DNA preservation in sediments and (2) the potential of soil bacteria to acquire mineral-adsorbed DNA through horizontal gene transfer (HGT). \nThe findings demonstrate that mineral surface properties substantially impact DNA stability\, offering new insights into sedimentary DNA taphonomy. Understanding these interactions can enhance environmental DNA (eDNA) applications for ecosystem. Moreover\, our data show that bacterial transformation of mineral-adsorbed DNA can lead to genetic diversity\, and is influenced by mineral surface properties. These insights suggest that mineral-facilitated HGT could serve as a pathway for bacterial evolution\, potentially affecting gene dispersal over extended temporal and spatial scales. In such an evolutionary scenario mineralogy and interfacial geochemical processes become central to the evolutionary process of maintaining fitness \nSpeaker Bio: \nKarina Krarup Sand\, PhD\, is an Associate Professor at the Globe Institute\, Faculty of Health and Medical Sciences\, University of Copenhagen\, specializing in interdisciplinary research. Her work embodies a unique integration of geochemistry\, microbiology\, and evolutionary biology to understand and address pressing global health and environmental challenges. Sand’s pioneering research in these fields has established her as a leader in the study of processes at the intersection of environmental surfaces and life. Dr. Sand also serves as Chair for Globe’s Diversity Programme. \nHer pioneering work in studying bio-mineral interactions at the molecular level has recently provided insight into parameters important for DNA preservation in sediments\, and how sediments can be considered spatiotemporal gene archives for bacteria. Her work on studying the mechanisms driving bacterial uptake of genetic material stored on mineral surfaces link sedimentary processes to bacterial evolution. The work also provides an explanation for the observed extensive dissemination of antibiotic resistance genes in our environment and is directly relevant for mitigation strategies. \nShe is an advocate for collecting knowledge that is stored and curated in distinct research silos and co-founded the evolutionary geobiology consortium to drive knowledge collection aiming to address oncoming global threats to human and ecosystem health. Dr. Sand earned her MSc in Geology and her PhD in Chemistry from the University of Copenhagen. She has held various research and academic positions in Denmark\, the United States\, and the United Kingdom. Her career includes prestigious research fellowships. Her international experience has equipped her with a global perspective and an expansive network within the scientific community.” \n 
URL:https://www.siliconvalleyacs.org/event/dna-mineral-interactions-at-the-molecular-level-implications-for-bacterial-evolution-and-ecological-inference/
LOCATION:Virtual
CATEGORIES:Webinar
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DTSTART;TZID=America/Los_Angeles:20250212T180000
DTEND;TZID=America/Los_Angeles:20250212T190000
DTSTAMP:20260425T134450
CREATED:20250112T234716Z
LAST-MODIFIED:20250117T224452Z
UID:21592-1739383200-1739386800@www.siliconvalleyacs.org
SUMMARY:CHIPS-funded Program for Advanced Metrology of Semiconductor Packaging Materials
DESCRIPTION:Stian Romberg\, PhD\, Materials Science and Engineering Division\, National Institute of Standards and Technology\nSponsored by Golden Gate Polymer Forum (GGPF)\nFebruary 12\, 2025\, from 6:00-7:00 pm\, Online\, Free/$5 Donation\, Registration required by Feb. 11th at 1:00 pm.\n\nAbstract\nThe CHIPS and Science Act budgeted $52 billion to invest in America’s semiconductor industry\, with $11 billion allocated for research and development activities\, like advancing measurement sciences critical for innovation. The project described in this presentation is part of the CHIPS Metrology Program Grand Challenge 3\, “Enabling Metrology for Integrating Components in Advanced Packaging.” We aim to improve the fundamental understanding of residual stress and warpage development in thermosetting polymers used for packaging semiconductors. \nThermosetting polymeric materials are essential in semiconductor packaging to provide mechanical integrity\, dissipate excess heat\, reduce signal loss\, etc. However\, the performance of these polymeric materials is affected by residual stresses generated from cure-induced shrinkage during processing and hygrothermal expansion/contraction during service. As advanced packaging trends towards thinner layers and 3D stacking\, packages become more susceptible to these stresses\, thereby compromising yield and reliability. Predictive models are used to analyze stress development in the package\, but to limited success due to insufficient availability of material properties data. Furthermore\, commercial thermoset packaging materials are typically highly filled\, complex formulations that hinder traditional material property measurement tools and analyses. \nTherefore\, our project is assembling an extensive suite of advanced metrologies for accurate material property measurements under relevant hygrothermal conditions to inform predictive models and improve engineering design and manufacturing productivity. Metrologies currently include differential scanning calorimetry and simultaneous rheology and Raman spectroscopy\, with additional spectroscopic\, residual stress\, and warpage measurement capabilities under development. Our plan is to (1) develop an open-source model material and (2) apply advanced metrologies that range from fundamental up to part-scale measurements. This approach will enable us to report material properties and measurement analyses with a level of transparency not observed in the semiconductor industry. \nSpeaker Background\n\nStian Romberg is a research scientist at the National Institute of Standards and Technology (NIST). He received his BS in Mechanical Engineering at Brown University where he played wide receiver on the football team. Then\, he earned his PhD in Mechanical Engineering at the University of Tennessee while conducting research at Oak Ridge National Laboratory. After defending his dissertation\, he completed an NRC postdoctoral appointment at NIST focused on using simultaneous rheology and Raman spectroscopy to design structurally stable curing schedules for additively manufactured thermoset composites. Stian remains at NIST\, but his focus has shifted to developing metrologies and analyses to understand the fundamental behaviors that govern residual stress in thermoset-based materials used for semiconductor packaging.
URL:https://www.siliconvalleyacs.org/event/chips-funded-program-for-advanced-metrology-of-semiconductor-packaging-materials/
LOCATION:Virtual
CATEGORIES:Webinar
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