Brown Bag Session at NERSC with Jason Swedlow
Wednesday, March 26, at noon
Jason Swedlow, co-founder of the Open Microscopy Environment (OME), a community-led open source software project that develops specifications and tools for biological imaging, will present on "The Open Microscopy Environment: Open Source Image Informatics for the Biological Sciences."
Location: NERSC, 415 20th St Oakland, CA 94612
Taking BART? Get off at 19th Street Station.
Driving? Park at Kaiser Center Parking Garage at 300 Lakeside Drive, Oakland, CA 94666; parking validation will be provided after the talk.
Information: email Joaquin Correa.
LBNL Integrated Bioimaging Seminars (monthly)
Seminars are scheduled the first Wednesday of each month from 4:00 to 5:00 p.m.. Each one hour seminar includes two 20 min. presentations and discussion time. For questions and speaker suggestions, or to be included in the bioimaging seminars email list, please contact firstname.lastname@example.org.
Seminars are held at 717 Potter Street, Berkeley, CA 94710: show your LBNL badge and sign in at the security desk upon arrival; obtain a parking pass at this desk or contact email@example.com 24 hrs in advance.)
717 Potter St., room 141
Focused on Soil Biogeochemical Imaging (host: Peter Nico)
Eoin Brodie, Earth Sciences Division, Berkeley Lab
Soils regulate the geochemical flux of most life-critical elements, control the production of food and renewable energy products, purify water for the biosphere, and regulate atmospheric greenhouse gases. Recently, it has become apparent that the processes governing soil C cycling occur, and vary, on fine spatial scales (nm-µm) and it is increasingly clear that observations made at these scales may be critical to predicting change at larger (m-km) scales. An understanding of these fine-scale interactions requires co-coordinated research across many disciplines. The goal of this LDRD is to develop a predictive understanding of how physical, chemical, and biological components interact to govern soil biogeochemistry, with a specific focus on microbial processes relevant to climate change. We are integrating approaches in imaging (radioisotope, 3D EM and synchrotron), microbiology (metagenomics and genome-based modeling) and mass spectroscopy to identify, quantify, and ultimately model activity hotspots in soil from the meter to nanometer scale. This presentation will discuss some of our recent highlights in technology development and integration.
andJennifer Pett-Ridge, Lawrence Livermore National Laboratory
“Small-Talk: Imaging Microbe-Mineral Interactions and Microbe-Microbe Elemental Trafficking”
A picture is worth a thousand words. Early developments in light microscopy revolutionized our understanding of the physical relationships microorganisms build with their surroundings. Now, newly-developed imaging methods allow insight into the chemical relationships microorganisms build. By combining techniques such as imaging mass spectrometry (NanoSIMS), SEM/TEM, and synchrotron-based approaches (e.g. STXM/NEXAFS and SRXTM), microbe-microbe, microbe-mineral, and microbe-organic matter associations and interactions can be characterized at a scale and specificity not before achieved. I will describe examples where these imaging approaches have been used (along with stable isotope tracing) to measure elemental trafficking in complex microbial systems (hypersaline microbial mats); link microbial identify and geochemical function (marine carbon cycling), and trace the flow and fate of organic molecules in soil.
Mustafa A.H Mir, Postdoctoral Researcher, Sohn Lab, UC Berkeley
and TBD 2nd presenter.
Nick Vandehey, Life Sciences Division
communities residing from the earth’s surface down to the bedrock play
critical roles in both Carbon Cycling and Environmental Remediation.
Using techniques adapted from medical imaging research, we are studying
the role of microbes in soils and sediments, aiming to characterize
their function and location with specific interest in the spatial
heterogeneity of microbes within a microcosm. The penetrating nature of
gamma rays makes radioisotope imaging methods ideally suited for this
application and scale of imaging as other imaging techniques often
applied to such systems have a more limited field of view or are
destructive to the sample. This talk will discuss results of experiments
related to imaging biomass and biogeochemistry in saturated sediment
and measuring the spatial distribution of CO2 uptake by cyanobacteria in
biological surface crusts.
and TBD 2nd presenter.
Seema Singh, Physical Biosciences Division
Past Seminars 2014
February 5, 2014
717 Potter St., room 141
Focused on Image Analysis challenges in Integrated Bioimaging (Host: Ben Bowen)
Oliver Ruebel, Visualization Group, Computational Research Division, Berkeley Lab
"Mass Spectrometry Imaging in the World of Modern Data Sciences"
Mass spectrometry imaging (MSI) is widely applied to image complex samples for applications spanning health, microbial ecology, and high throughput screening of high-density arrays. MSI has emerged as a technique suited to resolving metabolism within complex cellular systems; where understanding the spatial variation of metabolism is vital for making a transformative impact on science. Unfortunately, the scale of MSI data and complexity of analysis presents an insurmountable barrier to scientists where a single 2D-image is many gigabytes and comparison of multiple images is beyond the capabilities available to most scientists. In this presentation we will identify and discuss common data challenges in modern imaging and demonstrate how we are addressing these challenges in the context of mass spectrometry imaging as part of the OpenMSI project and web-based gateway for management and storage of MSI data (http://openmsi.nersc.gov). In particular, we will discuss the role of modern data formats, data provenance, and modern RESTful data interfaces as enablers for modern data-driven imaging experiments.
Peter Nugent, Computational Research Division, Berkeley Lab
"Making Effective Use of Machine Learning in Astrophysical Imaging Surveys"
Astrophysics is transforming from a data-starved to a data-swamped discipline, fundamentally changing the nature of scientific inquiry and discovery. The observational data obtained during this decade alone will supersede everything accumulated over the preceding four thousand years of astronomy. Currently there are 4 large-scale imaging and spectroscopic surveys underway, each generating and/or utilizing tens of terabytes of data per year. Some will focus on the static universe while others will greatly expand our knowledge of transient phenomena. Maximizing the science from these programs requires integrating the processing pipeline with high-performance computing resources coupled
to large astrophysics databases while making use of machine learning algorithms with near real-time turnaround. Here I will present an overview of one of these programs, the Palomar Transient Factory (PTF). I will cover the processing and discovery pipeline we developed at LBNL and NERSC for it and several of the great discoveries made during the 4 years of observations with PTF.
Past Seminars 2013
November 6, 2013
Note location: Bldg. 15, room 253
Dan Fletcher, Physical Biosciences Division "The Rise of Mobile Phone Microscopes"
Modern optical microscopes provide a unique window into the inner workings of biological systems, with new techniques offering improvements in resolution, sensitivity, and speed. However, as microscopes gain capabilities, they often become more expensive, more difficult to use, and less available. Not every experiment requires the latest microscopy technology, and many studies simply need greater availability of basic microscopy capabilities coupled with advanced image processing. In a side project that grew out of an undergraduate optics class, my lab has been developing low-cost mobile microscopes that take advantage of the high sensitivity cameras now available in mobile phones. This talk will describe recent efforts to build microscopes to image infectious bacteria, parasitic worms, and viral infections. Our work is pointing to the potential for low-cost mobile microscopes to expand access to high-quality imaging both inside and outside the traditional laboratory setting.
Paul Adams, Physical Biosciences Division "New Algorithms for Obtaining High Quality Atomic Structures from Crystallographic and Cryo-EM Data"
X-ray crystallography is a well established technique that is now routinely used to determine the structures of macromolecules. It is able to provide atomic resolution information that has been a prerequisite to the understanding the fundamentals of life, from the structure of the double helix to the structures of intact ribosomes. It is also a method that is central to the development of new therapeutics for human disease. Increasingly, researchers are studying larger complexes and/or systems will inherent flexibility, often leading to low resolution diffraction data. This lack of experimental observations presents challenges for obtaining high quality atomic models. We have developed new computational methods for improving models even in the presence of low resolution crystallographic data. Single particle cryo-electron microscopy is a technique that has been applied to the study of large molecular complexes. With the advent of new electron detectors this method is developing rapidly and is now approaching atomic resolution, making is feasible to build and refine atomic models. The latter is hampered by a lack of computational algorithms tailored to cryo-EM data. We have developed new methods that make it possible to optimize molecular models with respect to prior chemical knowledge and the experimentally derived density maps.October 2, 2013
Location: 717 Potter St., room 141
Luis Comolli, Ph.D., Life Sciences Division, "Correlating Genomics and Function Through 3-D Cryo-TEM of Intact Environmental Microbial Cells"
cryogenic transmission electron microscopy (cryo-TEM) has been
available for many years, it has rarely been applied to
environmentally-relevant organisms. This in part due to the difficulty
in preparing cryogenic TEM samples from microorganisms that cannot be
cultured. Cryo-TEM has already changed our view of microbial cell
architecture, and cryogenic electron tomography (cryo-ET) is becoming a
more widely used technique worldwide. Consequently, there is a potential
interest in using this technology as an approach to study environmental
microbial systems. These systems are challenging because they are often
remote, not possible to culture, difficult to transport artifact-free
and intact, and "dirty" of minerals and nanoparticles although such
particles contribute to their interest. Here we demonstrate that these
obstacles can be overcome. Our results include unprecedented cryo-TEM
and cryo-ET image data on intact cells and small pieces of biofilm from
environmental sites for which genomics and proteomics data are
available. This first successful application of cryo-TEM to
microorganisms within the in-situ context of their mutual interactions
and extracellular minerals opens the way to similar studies in many
other relevant model and environmental systems in microbial ecology and
David Knowles, Ph.D., Life Sciences Division, "Creating Digital Atlases of Embryogenesis"
Creating embryonic digital atlases has become an emerging multidisciplinary field. The goal is to quantitatively capture the dynamic 3D arrays of multiple cell types, which animals comprise, into a digital record from which biological processes can be studied. I will discuss how we are using high resolution optical imaging and developing new computational techniques in computer vision to analyze the complex morphology of late-stage embryos, with their 40,000 cells, 70 cell types and all major organs. I will present some of the biological finding. This work extends our VirtualEmbryo (http://bdtnp.lbl.gov/Fly-Net/), a digital morphology and gene expression atlas of the early-stage, Blastoderm, Drosophila embryo.
September 4, 2013 Seminar Recording
Ke Xu, Ph.D., Department of Chemistry, University of California-Berkeley, "A Novel, Periodic Cytoskeleton in Neurons Revealed by Sub-10 nm Super-Resolution Fluorescence Microscopy"
filaments (microfilaments) constitute a major cytoskeleton in
eukaryotic cells and play key roles in numerous cellular processes.
However, it has been a great challenge to visualize actin and related
cytoskeleton structures in cells owing to their small dimensions and
high packing density. Our recent work has substantially advanced
super-resolution fluorescence microscopy and achieved sub-10 nm optical
resolution for biological samples. The improved resolution enabled us to
optically resolve actin filaments in mammalian cells for the first
time. In particular, in neurons we discovered a novel cytoskeleton
structure that is highly ordered at the nanometer-scale. We found that
actin filaments are arranged into ring-like structures in axons, and the
rings are evenly spaced along the axon with a well-defined 190 nm
spacing, resulting in a ladder-like, periodic lattice with long-range
order. We further pinpointed the molecular mechanism underlying this
novel structure: spectrin tetramers connect adjacent actin rings, thus
regulating the periodicity of the lattice and forming a cohesive
cytoskeleton. This novel, periodic cytoskeleton is only found in axons,
and besides providing mechanical support for the membrane, it further
arranges sodium ion channels, the signal generators of neurons, into
similar periodic patterns along the axon.
Joaquin Correa, NERSC, "Integrated Tools for NGBI--Lessons Learned and Successful Cases"
Bioimaging (NGBI) requires a reliable and flexible solution for
multi-modal, high-throughput and high-performance image processing and
analysis. In order to solve this challenge, we have developed an
OMERO-based modular and flexible platform that integrates a suite of
general-purpose processing software, a set of custom-tailored
algorithms, specific bio-imaging applications and NERSC's high
performance computing resources and its science gateways.
June 5, 2013
Shahid Khan, Molecular Biology Consortium at LBNL, "Remodeling of the Dendritic Spine Cytoskeleton by Synaptic Stimulation"
Synaptic stimulation results in a sub-minute increase in spine size. The rapidity of the response implies it is governed by cytoskeletal dynamics. The calcium calmodulin dependent kinase II (CaMKII) has a central role. CaMKII has actin as well as myosin motors as its binding targets. The binding is regulated by intracellular calcium transients triggered by stimulation. We are taking a three pronged approach based on live cell imaging, in vitro assays and computer modelling to investigate actomyosin organization and its regulation by CaMKII. I will present photo-activation and single molecule fluorescence data from cell cultures that develop mechanistic models. I will also report on a minimal in-vitro system that we are developing to understand the physical rules underlying actomyosin self-organization and its regulation by CaMKII.
Manfred Auer, Life Sciences Division, "Branching Morphogenesis and Breast Cancer: Multiscale Multimodal Imaging of the Mammary Gland"
Development, function and disease of the mammary gland needs to be
understood at the level of individual proteins and their contribution to
the overall function, but also at the level of cell organelles, entire
cells and tissues in order to understand changes in function and
morphology underlying physiology and disease. Using a combination of
time lapse video phase contrast and fluorescence microscopy, biomarker
immunohistochemistry, wide-field high resolution transmission electron
microscopy as well as the novel large volume 3D imaging approaches
(Focused Ion Beam SEM and Serial Block Face SEM), we were able to
determine the cellular strategies for branching morphogenesis resulting
in an expanding and migrating yet functional tissue. In particular we
will focus on the change in cell and tissue polarity and the presence of
extensive membrane network (invadipodia). We will demonstrate the many
similarities between the developing tissue and mammary epithelial S1
cell acini and T4 aggregates grown in 3D matrix culture, with a focus on
the mechanotransducive intermediate filament network and its
interaction with the nuclear membrane. Our collaborative research on the
mammary gland is the poster child for why integrated bioimaging matters
and how combining multiple imaging modalities is the key for our
understanding of complex biological processes such as the biology and
pathology of tissues.
May 1, 2013
Note location: Building 84, room 318
Carolyn Larabell, UCSF and Physical Biosciences Division
Paul Ashby, Material Sciences Division
Note location: Building 84, room 318
Erwin Frise, Life Sciences Division---[NEW--Dan Fletcher's talk has been postponed]
"Fiji: A Complete Open Image Processing Environment for the Biosciences"
Fiji is a very popular distribution of ImageJ that includes modules for image acquisition, processing of optical microscopy images and electron microscopy images, and extraction of quantitative features from image data. It gives bioscientists a user friendly Photoshop like software and computational researchers a large library and feature rich platform for developing and distributing their algorithms. This talk will show how Fiji succeeds in being an open platform useful for many aspects of bioimage research and introduce new developments, including the new, even more powerful, ImageJ2.
Robert Glaeser, Life Sciences Division
"In-focus Phase Contrast for Cryo-EM"
Cryo-EM images of protein complexes are currently recorded with a large defocus in order to generate partial phase contrast. Several groups are now developing alternative technologies, however, which might allow one to record in-focus images with nearly full phase contrast. We, for example, are developing a novel variant of the “Foucault knife edge” aperture, suitable for use in electron microscopy. To illustrate its high level of performance, in-focus cryo-EM images have been recorded in which individual ~55 kDa streptavidin tetramers are clearly visible by eye. Monolayer crystals of streptavidin have also been used to show that the image resolution extends to better than 4 Å. It thus is shown that the potential exists to expand the use of cryo-EM to encompass much more of the proteome than at present. The current focus of this project is to increase the useable (i.e. charging-free) lifetime of these apertures to weeks or even months, rather than the current limitation of several hours or days.
March 6, 2013
Ben Bowen, Life Sciences Division
"OpenMSI: Making Mass Spectrometry Imaging Accessible"
The OpenMSI platform is an advanced data management, analysis and visualization resources for mass spectrometry imaging accessible to scientists via the web. Mass spectrometry imaging (MSI) is widely applied to image complex samples for applications spanning health, microbial ecology, and energy sciences. MSI has emerged as a technique suited to resolving metabolism within complex cellular systems; where understanding the spatial variation of metabolism is vital for making a transformative impact on science. Unfortunately, the scale of MSI data and complexity of analysis presents an insurmountable barrier to scientists where a single 2D-image may be 60GB and comparison of multiple images is beyond the capabilities available to most scientists. To overcome this, the OpenMSI project facilitates broad use of MSI by providing a web-based gateway for management and storage of MSI data, the visualization of the hyper-dimensional contents of the data, and the statistical analysis of the data. As a result, OpenMSI will make mass spectrometry imaging accessible as a standard method in imaging laboratories.
Puey Ounjai, Life Sciences Division (Ken Downing lab)
"Architectural Insights into Ciliary Partition"
Ciliary compartmentalization plays pivotal roles in ciliogenesis and in various signaling pathways. Combining single particle analysis and electron cryo-tomography, we have identified and characterized a structure at the ciliary base that appears to have all the features required for compartmentalization and which we thus call the "ciliary partitioning system" (CPS). This complex consists of the terminal plate, which serves as a cytosolic "ciliary pore complex" (CPC), and a membrane region well suited to serve as a diffusion barrier. The CPC is a plate-shaped structure containing nine pores through which the microtubule doublets of the basal body pass. Each pore expands from the doublet B-tubule into an opening well suited for the passage of intraflagellar transport particles. The membrane diffusion barrier encompasses an extended region of detergent-resistant periciliary membrane (ciliary pocket) and a ring complex that connects the CPC to the membrane. Proteomics analysis shows involvement of the ciliary pocket in vesicle trafficking, suggesting that this region plays an active role in membrane transport. The CPC and the ring together form a complete partition defining the ciliary boundary.
February 6, 2013
Abby Dernburg, Life Sciences Division and UC Berkeley
"Challenges in Imaging of Living, Moving Targets"
Work in my lab focuses on chromosome dynamics during meiosis. We are increasingly using in vivo imaging to better understand this process. I will discuss both the benefits of this approach, and the challenges that it creates.
Dula Parkinson, Advanced Light Source
"3D Micron-scale Bioimaging at the Advanced Light Source"
CAT (Computed Axial Tomography) Scanners are familiar in medical settings as a tool to provide slices through 3D objects, without requiring the physical slicing of the object. The extraordinary brightness of the x-rays at the Advanced Light Source makes it possible to perform real-time tomography at high resolution. The non-invasive nature of this instrument has allowed us to obtain high resolution internal images of samples such as fossils and minute spider musculature. The high speed of the instrument has allowed imaging of dynamic biological processes including water transport in plants, root-soil interactions, and changes in plant tissue during pretreatment for biofuel production. A major new effort is underway to streamline and automate the transfer and processing of the large amount of data produced by this technique, making it much easier for new users of the instrument to quickly visualize and extract information from collected images.
Past Seminars 2012
December 5, 2012
Vikram Bajaj, Materials Sciences Division
"Extending the Limits of Sensitivity and Resolution in NMR and MRI"
Magnetic resonance techniques peer into materials and objects in their unaltered native states and elucidate the structure, chemistry, and dynamics within. This motivates many applications of NMR and MRI in the laboratory, the clinic, and in industry alike. Nevertheless, several possible applications of NMR are limited by its low sensitivity, due to the weak equilibrium polarization of nuclear Zeeman states on which the signal intensity depends. This, in turn, limits the spatial resolution of conventional MRI experiments. I will discuss several techniques we are developing to overcome these limitations. These include dynamic nuclear polarization, a technique for electron-nuclear spin polarization transfer that has dramatically broadened NMR applications in solid materials; remote detection, by which NMR can be combined with microfluidic "lab on a chip" devices to produce novel analytical instruments; and, finally, optically detected NMR techniques that combine the sensitivity of optical spectroscopy with the chemical fidelity of magnetic resonance in micro- to nano-scale imaging experiments.
Sylvain Costes, Life Sciences Division
"High-throughput Cell Tracking Reveals DNA Repair Centers in Human Cells"
By expressing DNA damage sensor proteins such as 53BP1 tagged with GFP, one can study the response of live human epithelial cells exposed to ionizing radiation. 53BP1 gets recruited to sites of DNA damage within a few minutes following exposure to radiation, leading to the formation of bright foci in the nucleus. A microfluidics platform allowing precise control of cellular ambient conditions and automatic cell feeding is installed on a fully automated fluorescent microscopy platform. An open-source high-throughput application allows sophisticated cell tracking and ancestry recording. The response of hundreds of individual cells to radiation is measured as a function of cell cycle and the long-term fate of cell progeny can be fully characterized. The usage of sophisticated imaging and image processing have confirmed the existence of preferential sites of DNA repair in the nucleus and bring new insight regarding the impact of chromatin structure on radiation sensitivity.
November 7, 2012
Giovanni Birarda, Earth Sciences Division (Hoi-Ying Holman lab)
"Synchrotron Infrared Imaging for Biological Sciences"
Berkeley Synchrotron Infrared Structural Biology (BSISB) Program
Biological systems are complex and dynamic, sensitive at times to even the slightest change in temperature or presence of a chemical stressor. As a result, a prominent challenge that has been presented to the research community is how one may characterize these systems without perturbing them. Infrared microspectroscopy (IRMS) offers a label-free and non-destructive alternative to many of the currently available techniques, this minimizing the damage and unintentional changes to the system at a molecular level while providing a wealth of chemical information about the target system. The use of Synchrotron radiation (SR) in parallel with detector modifications and advancements at LBNL’s Advanced Light Source (ALS) enables users to obtain both chemical and spatial information on their analytes of interest at the diffraction limit of the IRMS technique. In this presentation, we will broadly discuss the applications of IRMS and imaging to the life sciences, explaining the analytical capabilities of the technique through the presentation of projects to which this technique has successfully been applied. From following biochemical processes inside single cells to a study of cellular compositional changes resulting from commonly practiced fixation processes, I hope elucidate the potential of IRMS imaging as an applicable technique in biology while describing a subset of BSISB’songoing projects that range from imaging improvement to the incorporation of complementary technologies.
Musahid Ahmed, ALS / Chemical Dynamics Beamline
"Imaging Mass Spectrometry with Lasers, Ion Beams, and Synchrotrons"
Chemical imaging methods provide simultaneously information of a sample’s chemical composition and spatial heterogeneity. In this program, imaging mass spectrometry is being performed with ion sputtering and laser desorption in conjunction with tunable vacuum ultraviolet (VUV) radiation generated at the Advanced Light Source. Knowledge gained from studies of fundamental desorption and ionization mechanisms are being applied to imaging lignin and plant biomass, following molecular transformations in soil organic matter, establishing microbial decomposition of plant biomass, and establishing the chemical composition and structure of biological material (i.e. melanin and lignin). I will discuss recent progress in elucidating the chemical structure of melanin – a material that has potential for novel optical and electronic applications. I will also briefly describe our new efforts in correlated optical imaging with ambient pressure mass spectrometry.
October 3, 2012
Peter Nico, Earth Sciences Division
"Imaging Microbe, Organic Matter, Mineral Interactions via Coupled STXM and NanoSIMS Analysis"
Advancing understanding of soil organic-mineral interactions requires disentangling the complex interactions between soil mineral surfaces, decomposed organic compounds, and soil microbes in structurally intact soil. To avoid method-related artifacts that are associated with the common physical soil fractionation techniques, non-invasive high-resolution imaging techniques have been recently developed to simultaneously determine the molecular composition, source and fate of added OM, and location of OM within soil micro-aggregates. Simultaneous high-resolution chemical characterization and isotope tracing can be achieved by combining nano-scale imaging mass spectrometry (NanoSIMS) and spatially resolved spectroscopy (STXM/NEXAFS). These techniques allow precise, high-resolution, quantitative measurement of molecular and isotopic patterns in an undisturbed sample.
David Skinner, NERSC
"Science Gateways, Trends in Data-centrism and the Web"
As data collected from simulations and experiments grows ever larger science teams require reliable and high performance means to analyze data at a distance. The notion of feeling secure about data only when we can hold our own entire copy in personal storage must give way to central shared data storage. This transition in scientific data management affords force multiplying benefits in terms of collaboration. Web based science gateways sited at large scale computing and data facilities can provide a set of methods for remote analysis, data sub-selection, and data sharing for wide ranging data-centric collaboration. In this talk we review the last two years of NERSC's science gateways program and offer ideas for the future of computational bio-imaging at LBL.
September 5, 2012
Paul Adams, Physical Biosciences Division
"Prospects for Using Free Electron Lasers for Crystallography"
Second and third generation synchrotron X-ray sources have had a dramatic impact on the field of structural biology, with the majority of new structures solved annually now coming from experiments performed at synchrotrons. Fourth generation free electron laser (FEL) X-ray sources are now becoming available. What are the potential applications of these radically different machines to structural biology? Recent results from the Linear Coherent Light Source (LCLS) at Stanford will be presented, and some of the potential uses of the Next Generation Light Source (NGLS) will be discussed.
"A walk through the LBNL Integrated Bioimaging Center"
With the Lab's support we have been able to set up in the Potter St. building a working prototype of the ultimate Integrated Bioimaging Center envisioned for the Richmond Bay Campus. I will briefly describe the current capabilities of the Center followed by a tour of the Center which will include a demonstration of the newly acquired OMX super-resolution optical microscope.
June 6, 2012
Bill Jagust, Life Sciences Division, UC Berkeley
"Imaging Neurochemistry and Brain Function"
Multimodal imaging of the human brain permits the understanding of how neurochemical processes affect brain function. This talk will provide two examples of this approach. One study will examine how brain dopamine affects large scale neural networks and how these networks are related to brain function. The other study will examine how beta-amyloid deposits in the brains of normal older people affect brain function and may permit the presymptomatic detection of Alzheimer's disease.
Eva Nogales, Life Sciences Division, UC Berkeley
"Defining Subunit Architecture in Macromolecular Assemblies using EM and Genetic Tags"
Mechanistic understanding of molecular transactions requires knowledge of the architectural organization of the macromolecular machines involved in these processes. Electron microscopy and image reconstruction is becoming a broadly use technique in the structural characterization of macromolecular assemblies. Within EM density maps, localization of specific subunits can be obtained, when recombinant expression system exists for the complex, by the use of genetic tags. In addition to localizing a subunit by tagging one or both of its termini, internal tags are being developed that can allow the effective “tracing” of the polypeptide path of large subunits. I will describe our recent use of such methods in defining the architecture of the eukaryotic proteasome lid subcomplex and the PRC2 gene silencing complex.
May 2, 2012
Dani Ushizima, Computational Sciences Division
"Image Analysis and Quantitative Evaluation from High-resolution Experimental Data"
One of the challenges in computer vision is to translate visual inspection into precise mathematical descriptions in order to recognize repeating patterns and automate decision making based on images. Each scientific domain demand adaptations and invention of new algorithms to deal with peculiarities of the data, acquisition-specific issues, to take advantage of high performance computer architectures, etc. This talk will describe image analysis and pattern recognition algorithms applied to diverse and multiscale image databases, ranging from retinal pathology characterization using color photographs, remote sensing using SAR, confocal microscopy of breast cancer, to advanced light source micro-CT of samples for carbon sequestration/storage investigation. We will discuss application of wavelets to the enhancement of reflectivity patterns, mathematical morphology and matched filters to obtain speed functions for propagation of interfaces, a new algorithm for network tracking and pipelines for image analysis.
"Imaging Alteration in Lipid Turn-over in Tumors"
Traditional metabolic profiling methods provide an unbiased analysis of cellular metabolism and have found a diverse range of applications spanning synthetic biology to human health. While these approaches maximize the number of metabolites detected, they depend on solvent extraction methods that result in a loss of spatial information and ignoring much of the inherent complexity of biological systems. Therefore it is critical to complement these profiling methods with small molecule imaging approaches. This talk will present new technologies for mass spectrometry based imaging to study dynamic and spatially defined metabolic processes within the 3D microenvironment.
April 4, 2012
Bruce Cohen, Molecular Foundry/Materials Sciences Division, "Next-generation Anocrystals for Imaging: Non-bleaching, Non-blinking, Anti-Stokes Phosphors"
Manfred Auer, Life Sciences Division, "Bacterial Social Networks: Multiscale, Multimodal Imaging of Bacterial Communities"
Special Bioimaging Initiative Seminar
"Metal-Induced Energy Transfer: Measuring Quantum Yields and Molecular Distances"
Prof. Dr. Jörg Enderlein
III. Institute of Physics, Department of Physics
Georg-August-University Göttingen, Germany
Friday, August 23, 2 - 3 p.m.
At 717 Potter St., room 141
When placing a fluorescing molecule close to a metal structure, one changes the local density of states of the electromagnetic field with profound consequences for the excitation and emission properties of the molecule. In particular, one observes an angular distribution of radiation which is completely different from the molecule in a homogeneous environment, a modification of its emission spectrum, and a strongly modified lifetime of its excited state (Purcell effect). This is due to the efficient electromagnetic coupling of the excited state to surface plasmons in the metal, which is similar to Förster Resonance Energy Transfer (FRET), where the energy of an excited donor molecule is transferred into the excited state of an acceptor molecule. We call this effect metal-induced energy transfer or MIET. Recently, we have used this effect to measure absolute values of quantum yield of fluorescing emitters. By placing a solution of the emitters into a metallic nano-cavity and monitoring the lifetime modification as a function of the cavity size, one can determine the radiative and non-radiative transition rates as well as estimate rotational diffusion coefficients. This method is even applicable for complex system showing multi-exponential decay behavior, where it allows for determining the quantum yield of emission for each sub-state separately, or for inhomogeneous mixtures of several emitters, where it allows for obtaining quantum yield values of each emitter species in the mixture. As far as we know, not other existing method is capable of doing that. However, MIET can be used also for localizing fluorescent emitters with nanometer accuracy. The MIET-coupling between an excited emitter and a metal film is strongly dependent on the emitter’s distance from the metal. We have used this effect to localize, with nanometer accuracy, tubulin molecules above a metallic surface. I will present an extension of this method which we have used for mapping the basal membrane of live cells with an axial accuracy of ~3 nm. The method is easy to implement and does not require any change to a conventional fluorescence lifetime microscope; it can be applied to any biological system of interest, and is compatible with most other super-resolution microscopy techniques which enhance the lateral resolution of imaging.
National Center for X-Ray Tomography Featured on KQED QUEST
On KQED TV September 12 at 7:30 p.m., the feature episode in the Bay Area science series QUEST is “Seeing Cells in 3-D,” shot earlier this year at the National Center for X-Ray Tomography at the Advanced Light Source. The center’s director, Carolyn Larabell, and associate director, Mark Le Gros, both of the Physical Biosciences Division (PBD), explain the science behind the x-ray microscope and how it works, displaying spectacular visuals and illustrating breakthroughs in basic biology and health.
Today at Berkeley Lab, September 12, 2012
NGLS Materials & Bioimaging at the Nanoscale Workshop
A day long Materials and Bioimaging workshop will be held Thursday August 30 - Friday Aug 31, 2012 at LBNL. This is one of a series of workshops that is intended to refine the science drivers for Next Generation Light Source and to translate the science needs into performance requirements for the facility. This includes fundamental Free Electron Laser parameters (e.g. ph/pulse, rep rate, tuning range, pulse duration etc.) as well as requirements for beamlines (photon delivery optics, detectors, lasers etc.) and endstations. Information from these workshops will be essential input to the development of a preliminary design for the facility.
This is great opportunity to learn more about the potential of the NGLS for biological research and also a chance to provide input and ideas to help shape its development. More details can be found here: https://sites.google.com/a/lbl.gov/ngls-science-workshops-2012/home
LBNL Integrated Bioimaging Initiative Workshop
9th Annual Advanced Imaging Methods Workshop
January 18 - 20, 2012
Host: University of California Berkeley Molecular Imaging Center
Workshop: "Flow Cytometry Data Analysis"
Lecture: "Optical Sectioning Techniques in Light Microscopy"
Seminar: "Advances in Super Resolution Imaging"
LBNL Multiscale Bioimaging Workshop: Towards a Joint Center for Integrated Bioimaging
June 18, 2008, 11:00-5:00 p.m., LBNL, Bldg. 66 Auditorium
Co-Leaders: Jan Liphardt/Manfred Auer
Gulliver Multiscale Bioimaging