The influence of strain rate on development of deformation texture under a dynamic shock compression of a 904L stainless steel was quantitatively investigated using synchrotron X-ray diffraction and crystallographic orientation distribution function (ODF) analysis. The Split-Hopkinson Pressure Bar (SHPB) technique was used to generate a high strain rate of andgt; 10(3) s(-1) for preparing the deformed samples. Starting with an almost random texture in a solution treatment condition, the deformed material developed several typical texture components, such as Goss texture and Brass texture. Compared to the texture components displayed in the state of quasi-static compression deformation, it was found that the high-speed deformation generated much weaker texture components. In combination with the change in microstructures observed by electron backscattering diffraction (EBSD) and the transmission electron microscopy (TEM) technique, the high-energy X-ray diffraction provides a powerful tool for ...

Sznitman, J; Sutter, R; Altorfer, D; Stampanoni, M; Rösgen, T; Schittny, J C (2010). Visualization of respiratory flows from 3D reconstructed alveolar airspaces using X-ray tomographic microscopy. Journal of Visualization, 13(4):337-345. ...

The purpose of the workshop is to bring together the best scientists from the United Arab Emirates (UAE) and synchrotron experts and see how the most strategic fields for the UAE can be addressed through synchrotron science. UAE scientists will include both national and non-national speakers. International top synchrotron experts will give a talk at the event.. One of the main points will be to understand what the requirements of the UAE scientists are in terms of synchrotron research (what types of beamlines, techniques, etc.). Once these are defined, we will try to understand what would be the best option in terms of costs and benefits for the UAE.. ...

Comparison of synchrotron radiation and conventional X-ray microcomputed tomography for assessing trabecular bone microarchitecture of human femoral ...

Accelerators like the National Synchrotron Light Source (NSLS) II fire particles around a circular tunnel to nearly the speed of light. But as electrons curve around the ring, they lose energy in the form of light. Rather than think of this as a defect, researchers at Brookhaven National Laboratory found a way to harness this excess light and use it to understand the world at its most fundamental level. This basic research, however, can lead to remarkable and practical results. Considering the original NSLS at Brookhaven helped win two Nobel prizes, create better HIV treatments and rethink the battery, this increase in performance will likely open the door to groundbreaking new discoveries.. ...

Abstract: Background: As a novel approach to solve the protein structure, serial femtosecond crystallography (SFX) has been developed rapidly owing to the advantages of the room-temperature data collection, lower radiation damage and time-resolved study. The first X-ray free-electron laser (XFEL) based SFX experiment has offered a new method to structure determination of protein microcrystals successfully. Purpose:The aim is to introduce SFX into the widely-available third-generation synchrotron radiation (SR). Methods: The electrospinning sample delivery system is a potential method to be applied on SR. The theoretical and experimental researches on electrospinning were studied using BL17U1 beamline in Shanghai synchrotron radiation facility (SSRF). Results: A microjet containing microcrystals was produced from the liquid meniscus and controlled by an electrostatic field. The air ionization problem disturbing electrospinning in SR experiment was solved by providing vacuum condition and coaxial ...

In order to investigate FeSO4, ZnSO4 (the two of main metal compositions of Shanghai PM2.5 (particle matter with those aerodynamical diameter |2.5 mu m)) effects on acute lung injury, six solutions contained PM2.5 aerosol particles, FeSO4, ZnSO4 and their mixtures were instilled intratracheally into mouse lungs for experiment. By 2 days. after instillation, the live mice were checked in vivo by synchrotron refractive index microradiography. In addition after extracted and examined by dissection, the right lobes of lung were fixed by formalin, then imaged by synchrotron microradiography again. Corresponding parts of those lung tissues were embedded in paraffin for histopathologic study. The synchrotron X-ray microradiographs of live mouse lung showed different lung texture changes after instilled with different toxic solutions. Hemorrhage points in lung were observed more from those mice instilled by FeSO4 contained toxin solutions groups. Bronchial epithelial hyperplasia can be observed in ZnSO4

Presented here is a protocol for cell culture on silicon nitride membranes and plunge-freezing prior to X-ray fluorescence imaging with ...

A radiation-based timer for use in an implantable medical device (IMD) includes a radiation source and a radiation detection circuit. The radiation source emits radiation particles during a process referred to as radioactive decay. The radiation detection circuit detects the radiation particles emitted during the decay process and tracks the number of radiation particles detected. When the number of radiation particles detected reaches a threshold value, a timer signal is generated. In this manner, the radiation-based timer generates a timer signal as a function of the radioactive decay of the radiation source. The timer signal may be used by one or more components of the IMD for any of a number of functions, including as a wakeup trigger for a communications and/or a sensor event.

Micro-X-ray absorption near-edge structure (μ-XANES) spectroscopy has been used by several recent studies to determine the oxidation state and coordination of iron in silicate glasses. Here, we present new results from Fe μ-XANES analyses on a set of 19 Fe-bearing felsic glasses and 9 basaltic glasses with known, independently determined, iron oxidation state. Some of these glasses were measured previously via Fe XANES (7 rhyolitic, 9 basaltic glasses; Cottrell et al. 2009), while most felsic reference glasses (12) were analyzed for the first time. The main purpose of this study was to understand how small changes in glass composition, especially at the evolved end of silicate melt compositions occurring in nature, may affect a calibration of the Fe μ-XANES method.. We performed Fe μ-XANES analyses at different synchrotron radiation sources [Advanced Photon Source (APS), Argonne, U.S.A., and Angströmquelle Karlsruhe (ANKA), Germany] and compared our results to existing calibrations obtained ...

TY - JOUR. T1 - Novel rhenium(V) nitride complexes with dithiocarbimate ligands. T2 - A synchrotron X-ray and DFT structural investigation. AU - Perils, Joanne. AU - Cortezon-Tamarit, Fernando. AU - Kuganathan, Navaratnarajah. AU - Kociok-Köhn, Gabriele. AU - Dilworth, Jonathan R. AU - Pascu, Sofia I.. PY - 2018/4/24. Y1 - 2018/4/24. N2 - The application of rhenium complexes as therapeutic agents in nuclear medicine has propelled research into the chemistry of these compounds. In our effort to develop and investigate new therapeutic radiopharmaceuticals based on the complexes of rhenium we have investigated the nitride core, [ReN]2+. This work looks at the behavior of sulfonamide based dithiocarbimates towards the rhenium(V) nitride core. The aim here was to prepare anionic complexes with aromatic as well as fluorescent aromatic groups in the sulfonamide substituent located on the dithiocarbimate backbone. We envisaged that the polar sulfonamide and dianionic charge would confer solubility in ...

...SASKATOON SASKATCHEWAN Canadian Light Source (CLS) staff scientist Lu... The advantage to using microscopes with synchrotron light is that it ...The team analyzed preserved samples of healthy and diseased tissue tha...Barretts Esophagus (BE) occurs when the cells that normally line the ...,University,of,Saskatchewan,and,Canadian,Synchrotron,researchers,shed,light,on,esophageal,disease,biological,biology news articles,biology news today,latest biology news,current biology news,biology newsletters

We thank Prof. Dr. Wolfgang Baehr (University of Utah, USA) for providing us PrBP/δ expression vector. We are obliged to Ms. Ingrid Semjonow, Ms. Helena Seibel and Mr. Brian Bauer for their excellent technical assistance in purifying reagents and in protein preparations. We are grateful to Uwe Müller, Manfred Weiss and the scientific staff of the BESSY-MX/Helmholtz Zentrum Berlin für Materialien und Energie at beamlines BL14.1, BL14.2 and BL14.3 operated by the Joint Berlin MX-Laboratory at the BESSY II electron storage ring (Berlin-Adlershof, Germany) and the scientific staff of the European Synchrotron Radiation Facility (ESRF, Grenoble) at beamlines ID14-1, ID14-4, ID23-1, ID23-2, ID30A, ID30B and ID29, where the data were collected, for continuous support. This work was supported by grants from the Deutsche Forschungsgemeinschaft (SFB740 to T.M., C.M.T.S, M.H., P.S.; SFB1078-B6 to P.S.; SFB958 to C.M.T.S.), DFG Cluster of Excellence Unifying Concepts in Catalysis (Research Field D/E to ...

The penetrating power of X-rays coupled with the high flux of 3rd generation synchrotron sources makes X-ray tomography to excel among fast imaging methods . To exploit this asset of synchrotron sources is the motivation for setting up an ultra-fast tomography endstation at the TOMCAT beamline. The state of the art instruments at synchrotron sources offer routinely a temporal resolution of tens of seconds in tomography. For a number of applications, for example biomedical studies, the relevant time scales (breathing, heartbeat) are rather in the range of 0.5-2 seconds. To overcome motion artifacts when imaging such systems a new ultra-fast tomographic data acquisition scheme is being developed at the TOMCAT beamline. We can acquire a full set of projections at sub-second timescale in monochromatic or white-beam configuration. We present a feasibility study with the ultimate aim to achieve sub-second temporal resolution in 3D without significant deterioration of the spatial resolution. For the ...

In this study, the course of myofibrillogenesis in Drosophila pupae was followed by means of conventional X-ray diffraction and end-on microdiffraction. Owing to the high transmission of X-ray beams, the diffraction technique is suitable for detecting overall regularity in molecular arrangement in bulk specimens such as the thoraces of insects. With the wavelength of the X-ray used here (0.1 nm), this technique will be applicable to larger insects, including honeybees and silkworm moths. In the conventional X-ray diffraction recordings, in which the beamsize is comparable to the size of a Drosophila thorax (approx. 1 mm), the extent of development of thoracic musculature can be diagnosed with a single shot of chest X-ray. This is a non-invasive method requiring relatively low doses of X-rays and may be incorporated for routine checks of developmental status and/or quick assessment of effect of mutations on flight muscle-related genes. On the other hand, the end-on microdiffraction recording is ...

The European Synchrotron Radiation Facility Medical Research Beamline is now fully operational. One of the primary programs is the development of dual-energy transvenous coronary angiography for in vivo human research protocols. Previous work at this and other synchrotrons has been entirely devoted to the use of the dual-energy digital subtraction technique at the iodine k-absorption edge at 33.17 keV. The images are recorded in a line scan mode following venous injection of the contrast agent. Considerations of the patient dose, the dilution of the contrast agent in the pulmonary system and the arteries overlying the filled ventricles have limited the image quality. The ESRF facility was designed to allow dual- energy imaging at higher energies, for example at the gadolinium k-absorption edge at 50.24 keV. The advantages have been theoretically known for many years, with the higher energy promising higher image quality with less radiation dose. During the commissioning phase of the ESRF ...

Nanoflake/graphite Fibers EI 作者：Liu, Zhihe ;Tan, Hua ;Liu, Daobin ;Liu, Xiaobiao ;Xin, Jianping ;Xie, Junfeng ;Zhao, Mingwen ;Song, Li ;Dai, Liming ;Liu, Hong 作者机构：[Liu, Zhihe ;Liu, Hong ] Institute for Advanced Interdisciplinary Research (IAIR), University of Jinan, Shandong; 250022, China;[Liu, Daobin ;Song, Li ] National Synchrotron Radiation Laboratory CAS Hefei Science Center University of Science and Technology of China Hefei, Anhui; 230026, China;[Liu, Zhihe ;Tan, Hua ;Xin, Jianping ;Liu, Hong ] State Key Laboratory of Crystal Materials, Shandong University, Jinan; Shandong; 250100, China;[Xie, Junfeng ] College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan; 250014, China;[Liu, Xiaobiao ;Zhao, Mingwen ] School of Physics and Microelectronics, Shandong University Jinan, Shandong; 250100, China;[Dai, Liming ] Center of Advanced Science and Engineering for Carbon (Case4carbon), Department of Macromolecular Science and Engineering, ...

Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Solid Earth Geology. ...

Synchrotron-based micro X-ray absorption spectroscopy (micro-XAS) in combination with micro X-ray fluorescence (micro-XRF) and micro X-ray diffraction (micro-XRD) are powerful tools for spatially resolved micro-scale investigations of retention processes in heterogeneous systems. We have successfully applied these techniques in the investigations of uptake processes in argillaceous rocks and hardened cement paste. Here one of the essential questions is On what mineral phase or phases is sorption occurring in the complex mineral assemblage? and Is it the same phase(s) assumed in the modeling? In some cases minor minerals may well be important. Furthermore, we were able to shine light into the alkali-aggregate reaction, which is a severe alteration process limiting the lifetime of concrete structures exposed to water or moisture ...

An initial tranche of results from day-to-day use of a robotic system for setting up 100 nl-scale vapour-diffusion sitting-drop protein crystallizations has been surveyed. The database of over 50 unrelated samples represents a snapshot of projects currently at the stage of crystallization trials in Oxford research groups and as such encompasses a broad range of proteins. The results indicate that the nanolitre-scale methodology consistently identifies more crystallization conditions than traditional hand-pipetting-style methods; however, in a number of cases successful scale-up is then problematic. Crystals grown in the initial 100 nl-scale drops have in the majority of cases allowed useful characterization of X-ray diffraction, either in-house or at synchrotron beamlines. For a significant number of projects, full X-ray diffraction data sets have been collected to 3 Šresolution or better (either in-house or at the synchrotron) from crystals grown at the 100 nl scale. To date, five structures ...

A photovoltaic device comprises an upper cell and a lower cell separated by an electrically insulating layer. The cells and the layers are fabricated as a single monolithic structure, and separate electrical contacts are provided for the upper and lower cells to allow independent extraction of current from each cell. The upper cell has a larger bandgap than the lower cell so that incident low energy photons unabsorbed and unconverted by the upper cell can propagate through to the lower cell for conversion. The two bandgaps can be selected to accommodate spectral ranges of interest. The device is incorporated into a system including two sources of photons with different wavelength ranges associated with the bandgaps of the two cells, such that each cell can convert photons from one source. One source may be the sun and the other may be a local photon source such as a thermal source. Alternatively, both photon sources may be local sources. Operation of the device can be further optimised and

The J. Bennett Johnston, Sr., Center for Advanced Microstructures and Devices (CAMD), is named for the father of its congressional sponsor, Senator J. Bennett Johnston, Jr. of Louisiana. CAMD is a synchrotron radiation research center at Louisiana State University in Baton Rouge. The mission of CAMD is to provide infrastructure for research and education in synchrotron-based science and technology. The facility was built with a $25-million grant from the U.S. Department of Energy and its operations are state-funded by LSU. The heart of the facility is a 1.3 GeV electron storage ring that was built exclusively to provide synchrotron radiation. Research in basic sciences and microfabrication is conducted by scientist and engineers from Louisiana universities, along with distinguished scientists from national and international institutions. ...

Norwegian and International Researchers can apply for the Fellowship.. Scholarship Description: The PhD project will be in the field of structural biology on a project entitled Bacterial toxins - Structure, function and molecular interactions . The project will ideally combine biophysical characterization (foremost by X-ray crystallography) with cell biological investigations. It is anticipated that the project will include a research stay at a foreign institution such as the European Synchrotron Radiation Facility (ESRF), Grenoble. The project can be expanded to involve collaborations with Michele Cascella (computational chemistry) and Kirsten Sandvig (cell biology).. Number of award(s): One PhD research fellowship is available.. Duration of award(s): The fellowship will be for a period of 4 years, with 25 % compulsory work (teaching responsibilities at the Department). Otherwise, the fellowship will be for a period of 3 years, with no compulsory work.. What does it cover? Position code 1017, ...

CHDI Foundation, Inc., a biomedical research organization exclusively focused on developing disease-modifying therapies for HD, is working with BioFocus, a drug discovery provider, to solve the structure of the active caspase-6 and in complex with inhibitors, with a view towards developing caspase-6 specific drugs. Using mosquito® Crystal for automated low-volume crystal screening, BioFocus identified crystallization conditions for apo-caspase-6 in the active state (PDB ID 3P45), in complex with the reversible inhibitor Ac-VEID-CHO (PDB ID 3P4U), as well as in complex with the irreversible inhibitor Z-VAD-FMK (PDB ID 3QNW). Optimization of the crystallization conditions of the irreversible inhibitor yielded plate-like crystals typically only 10-20 μm thick, which required synchrotron light to gain sufficient optical resolution.. ...

The DXAS beamline is an experimental station dedicated to dispersive x-ray absorption spectroscopy (acronym for DXAS) techniques, in the hard x-ray energy range (5 to 14 keV). The peculiarity of this beamline is the capability to collect absorption spectra over an extended range of photon energies without any mechanical movement of its optical elements. The DXAS is especially suited for detecting weak signals in XANES (X-ray Absorption Near-Edge Spectroscopy) and XMCD (X-ray Magnetic Circular Dichroism) experiments and for tracking time-dependent evolution of chemical reactions.. DXAS is installed on a 1.67T bending-magnet source, and it was opened to users in 2005. The beamline is comprised by the synchrotron light source, a vertically focusing bendable mirror, a bent crystal polychromator, and an area detector. The beam path over the optical elements starts when it hits the bendable mirror, used for vertical focusing as well as harmonic rejection. Then the light beam impinges onto a ...

TY - JOUR. T1 - Controlling N-doping type in carbon to boost single-atom site Cu catalyzed transfer hydrogenation of quinoline. AU - Zhang, Jian. AU - Zheng, Caiyan. AU - Zhang, Maolin. AU - Qiu, Yajun. AU - Xu, Qi. AU - Cheong, Weng Chon. AU - Chen, Wenxing. AU - Zheng, Lirong. AU - Gu, Lin. AU - Hu, Zhengpeng. AU - Wang, Dingsheng. AU - Li, Yadong. N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was supported by the National Key R&D Program of China (Nos. 2018YFA0702003 and 2016YFA0202801), the National Natural Science Foundation of China (Nos. 21890383, 21671117, 21871159, and 21901135), the National Postdoctoral Program for Innovative Talents, the Shuimu Tsinghua Scholar, Science and Technology Key Project of Guangdong Province of China (No. 2020B010188002), and Beijing Municipal Science & Technology Commission (No. Z191100007219003). We thank the BL14W1 station in Shanghai Synchrotron Radiation Facility (SSRF) and 1W1B station for XAFS measurement in ...

A research project, published this week in the journal Nature, sheds light on the bizarre halszkaraptor - a dinosaur so unusual that scientists are hailing it as a new species. What is very special about it is that it looks very weird. It doesnt look like any other dinosaur that we know so far, Vincent Fernandez, a paleontologist at the European Synchrotron Radiation Facility and co-author of the study, told The Guardian. About the size of a goose, the dinosaur boasted a long tail, a curved, elegant neck and a duck-like bill. While that may seem all bird to you, the halszkaraptor is considered non-avian. Its also a close cousin to the Cretaceous Periods famously ferocious velociraptor.

TY - GEN. T1 - Microfocusing optics for hard xrays fabricated by x-ray lithography. AU - Krasnoperova, Azalia A.. AU - Chen, Zheng Guo. AU - Cerrina, Franco. AU - Difabrizio, E.. AU - Gentili, Massimo. AU - Yun, Wenbing. AU - Lai, Barry P.. AU - Gluskin, Efim S.. PY - 1995. Y1 - 1995. N2 - Lithographic techniques for fabrication of hard x-ray Fresnel zone plates are discussed. Practical results achieved at the Center for X-ray Lithography of the University of Wisconsin- Madison are presented. Fabrication technology includes replication of an e-beam written master mask into a thick photoresist by synchrotron radiation x-ray lithography, and subsequent electroplating of a metal zone plate structure using photoresist pattern as a mold.. AB - Lithographic techniques for fabrication of hard x-ray Fresnel zone plates are discussed. Practical results achieved at the Center for X-ray Lithography of the University of Wisconsin- Madison are presented. Fabrication technology includes replication of an ...

The RF gymnastics involved in the delivery of proton and lead ion bunches to the LHC can result in satellite bunches of varying intensity occupying the nominally empty RF buckets. Quantification of these satellites is crucial for bunch-by-bunch luminosity normalization as well as for machine protection. We present an overview of the longitudinal density monitor (LDM) which is the principal instrument for the measurement of satellite bunches in the LHC. The LDM uses single photon counting of synchrotron light. The very high energies reached in the LHC, combined with a dedicated undulator for diagnostics, allow synchrotron light measurements to be made with both protons and heavy ions. The arrival times of photons are collected over a few million turns, with the resulting histogram corrected for the effects of the detectors deadtime and afterpulsing in order to reconstruct the longitudinal profile of the entire LHC ring. The LDM has achieved a dynamic range in excess of 105 and a time resolution ...

TY - JOUR. T1 - Response to Comments on Structural studies of haemoglobin from pisces species shortfin mako shark (Isurus oxyrinchus) at 1.9 Å resolution by P. Ramesh et al. (2013). J. Synchrotron Rad. 20, 843-847. AU - Ramesh, Pandian. AU - Sundaresan, S. S.. AU - Sathya Moorthy, Pon. AU - Balasubramanian, M.. AU - Ponnuswamy, M. N.. PY - 2014/7. Y1 - 2014/7. UR - http://www.scopus.com/inward/record.url?scp=84903582799&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=84903582799&partnerID=8YFLogxK. U2 - 10.1107/S1600577514010285. DO - 10.1107/S1600577514010285. M3 - Letter. C2 - 24971984. AN - SCOPUS:84903582799. VL - 21. JO - Journal of Synchrotron Radiation. JF - Journal of Synchrotron Radiation. SN - 0909-0495. IS - 4. ER - ...

TY - JOUR. T1 - Liquid Structure of CO2-Reactive Aprotic Heterocyclic Anion Ionic Liquids from X-ray Scattering and Molecular Dynamics. AU - Sheridan, Quintin R.. AU - Oh, Seungmin. AU - Morales-Collazo, Oscar. AU - Castner, Edward W.. AU - Brennecke, Joan F.. AU - Maginn, Edward J.. N1 - Funding Information: Support for the work of Q.R.S. and E.J.M. was provided by the Air Force Office of Scientific Research under AFOSR award number FA9550-14-1-0306. Computational resources were provided by the Notre Dame Center for Research Computing. Claudio Margulis and Jeevapani J. Hettige are acknowledged for their help with the structure function calculations. We acknowledge time on beamline 11-ID-B at the Argonne National Laboratory Advanced Photon Source under APS General User Proposal GUP-43233. For experimental support at APS beamline 11-ID-B, we thank Dr. Olaf J. Borkiewicz and Mr. Kevin A. Beyer. E.W.C. was supported by NSF grant number CHE-1362272. J.F.B. and S.O. acknowledge financial support from ...

We have measured the stability of a variety of photodiodes exposed to 157-nm light from a pulsed excimer laser by using a radiometry beamline at the Synchrotron Ultraviolet Radiation Facility at the National Institute of Standards and Technology. The intense, pulsed laser light exposed the photodiodes, whereas the low-intensity, continuously tunable light from the synchrotron source measured changes in the characteristics of the photodiodes, such as in the responsivity and the reflectance from the surface of a photodiode. Photodiodes studied include both silicon pn-junction and Schottky-barrier types. Among these photodiodes, we found that the damage mechanism for photodiodes with SiO2-based passivating layers is mainly the buildup of SiO2-Si interface trap states. The interface trap state buildup is well known for other semiconductor devices and is generally recognized as a product induced by radiation with an energy more than the 9-eV SiO2 bandgap energy rather than the 7.9-eV energy of the ...

Diamond is the UKs national synchrotron science facility. Its shaped like a huge ring, and is a bit like a giant microscope. Diamond speeds up electrons to near light speeds, producing a light 10 billion times brighter than the sun. These bright beams are then directed off into laboratories known as beamlines; here scientists use the light to study everything from viruses and vaccines to fossils and jet engines.. Diamond is one of the most advanced scientific facilities in the world, and its pioneering capabilities are helping to keep the UK at the forefront of scientific research. Here you can read about cutting-edge scientific research taking place at the synchrotron; and find out when your next chance is to visit Diamond. So take a look around, and find out what lies within the walls of the synchrotron.. ...

The purpose of this research is to develop improved diagnostic and treatment tools for prostate cancer in humans through the use of a canine (dog) model and a synchrotron-based x-ray source for imaging and therapy at the Canadian Light Source (CLS). Novel techniques in synchrotron x-ray imaging, specifically in-line phase contrast CT (PC-CT), will be explored as a valuable method for research and clinical imaging of spontaneous canine prostatic diseases as a model for human diseases. ...

Intimately intergrown micron-scale framboidal pyrite, carbonaceous material (CM), chalcopyrite, sphalerite and cobaltite form polyframboids in prehnite-pumpellyite facies rocks of the Otago Schist, New Zealand. This study quantifies the metal contents of these polyframboids using synchrotron X-ray fluorescence (SXRF) and laser ablation inductively coupled plasma spectrometry (LA-ICP-MS). Trace elements Au, Zn, As, Mo, Co, Ni, Cu, Ag and Pb are significantly enriched in the polyframboids. The distribution of Zn most closely follows that of CM, and was probably absorbed into the structure of the polyframboids during biogenic processes. The concentrations of Au and Ag are positively corrected with the Zn concentration in the polyframboids (R2 of Au-Zn and Ag-Zn are 0.81 and 0.89, respectively.). The concentration of other trace elements, such as As, Co and Cu, which occur adjacent to Zn on elemental maps, show a weak relationship with Zn and may have been incorporated into the polyframboids during ...

Abstract: Inductively coupled plasma mass spectrometry (ICP-MS) was used to quantify the total amount of trace elements in retina from adult male Sprague-Dawley rats (n = 6). Concentration of trace elements within individual retinal areas in frozen sections of the fellow eye was established with the use of two methodologies: (1) particle-induced X-ray emission (PIXE) in combination with 3D depth profiling with Rutherford backscattering spectrometry (RBS) and (2) synchrotron X-ray fluorescence (SXRF) microscopy. The most abundant metal in the retina was zinc, followed by iron and copper. Nickel, manganese, chromium, cobalt, selenium and cadmium were present in very small amounts. The PIXE and SXRF analysis yielded a non-homogenous pattern distribution of metals in the retina. Relatively high levels of zinc were found in the inner part of the photoreceptor inner segments (RIS)/outer limiting membrane (OLM), inner nuclear layer and plexiform layers. Iron was found to accumulate in the retinal ...

An interview with Dr. Gerry McDermott of the National Center for X-ray Tomography. Dr. Biology tours the synchrotron that is also called the giant monster. Dr. Biology learns how the football sized facility is used to power a new kind of microscope.. Content Info , Transcript ...

Porphyrin-based materials are prime candidates for solar energy harvesting applications. New compounds incorporating the porphyrin core, which exhibit the columnar liquid crystal (LC) phase, were synthesized as they offer a route to obtaining defect-free large area monodomain films. The structure of the phases exhibited by these materials has been probed by synchrotron X-ray diffraction with a microfocus (14ím x14 ím) beam. Exploiting the multidomain nature (i.e., having differently oriented crystal axes) of a thin glass cell, it was possible to obtain complete structural information without the need to have one single macroscopic crystal, which is normally difficult to obtain. The results confirmed the existence of the isotropic, discotic (columnar) LC, and discotic-ordered LC phases in these materials. The optical microscopic work demonstrates how macroscopic control of columnar orientations is achieved by manipulating the LC film thickness, substrate preparation, and the thermal annealing process.

No topic is more fundamental to Chemistry than the nature of the chemical bond. In crystalline solids, the chemical bond gives rise to the electronic bandstructure of the material, this then determines whether the material is a metal, semiconductor, semi-metal, etc.; it determines the optical characteristics, the transport properties and the usefulness of any given crystalline solid. Novel x-ray spectroscopic techniques are now available to probe the electronic structure of crystalline solids, element-by-element and even state-by-state. These synchrotron radiation based methods will be applied to a particular class of crystalline solids to study more fully their basic electronic structure. The electronic structure of a class of crystalline solids will be investigated through a novel application of polarisation dependent synchrotron radiation based resonant soft x-ray emission spectroscopy and x-ray absorption spectroscopies to obtain element specific, symmetry and state selective measurements of ...

Purpose: We have developed a gated spot scanning proton beam therapy system with real-time tumor-tracking. This system has the ability of multiple-gated irradiation in a single synchrotron operation cycle controlling the wait-time for consecutive gate signals during a flat-top phase so that the decrease in irradiation efficiency induced by irregular variation of gate signal is reduced. Our previous studies have shown that a 200 ms wait-time is appropriate to increase the average irradiation efficiency, but the optimal wait-time can vary patient by patient and day by day. In this research, we have developed an evaluation system of the optimal wait-time in each irradiation based on the log data of the real-time-image gated proton beam therapy (RGPT) system. Methods: The developed system consists of logger for operation of RGPT system and software for evaluation of optimal wait-time. The logger records timing of gate on/off, timing and the dose of delivered beam spots, beam energy and timing of ...

Reduction of seed dormancy mechanisms, allowing for rapid germination after planting, is a recurrent trait in domesticated plants, and can often be linked to changes in seed coat structure, in particular thinning. We report evidence for seed coat thinning between 2,000 BC and 1,200 BC, in southern Indian archaeological horsegram (Macrotyloma uniflorum), which it has been possible to document with high precision and non-destructively, through high resolution x-ray computed tomography using a synchrotron. We find that this trait underwent stepped change, from thick to semi-thin to thin seed coats, and that the rate of change was gradual. This is the first time that the rate of evolution of seed coat thinning in a legume crop has been directly documented from archaeological remains, and it contradicts previous predictions that legume domestication occurred through selection of pre-adapted low dormancy phenotypes from the wild.

See first link about a synchrotron projection TV, because we need something like that light-source here, and see the second link about carbon bicarbonate, because it provides the background chemistry that this Idea is about (and sulfur is mentioned in an annotation, too!).. OK, the main problem with making carbon bicarbonate is that the carbon atom is a quite-small atom (significantly smaller than oxygen). I suspect this is the main reason why there is no such thing as poly-CO2 (see link) except under extreme pressure. Therefore, even if we could catalyze the formation of carbon bicarbonate, with its central carbon surrounded by and single-bonded with 4 oxygen atoms, it probably could not be expected to persist.. Sulfur, however, is nicely different. While not as plentiful as carbon, it could be plentiful ENOUGH (see link). Certainly it is routinely extracted from carbon-containing fossil fuels (to mostly prevent acid rain). It is a much larger atom than carbon (significantly larger than ...

Baking the perfect loaf of bread is both a science and an art, so researchers are using Canadas only synchrotron to look at the way bubbles form in bread dough to understand what makes the perfect loaf and how gluten-free ...

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I am a dinosaur enthusiast and have been aware of Noddy for some time, and I find it interesting that you mention the time lapse of the fossil being presented at the Australian Synchrotron. Just wondering, is the fossil still on display there, and is there anywhere that video can be seen? I understand if this was all exclusive, but since I have been interested in this dinosaur for quite some time (I remember Tom and Pat Vickers-Rich bringing it up when they were down at the Otways near Dinosaur Cove, and they mentioned some very intriguing features), I would appreciate it if there is any information I can get from anywhere, or even just any info on when it could become available if it isnt. If you want to reply, just do so on this page and I will check it when I can (no need to rush it or anything ...

By Kimberly Parker, special correspondent for Cross-check. [Editors Note: I recently forced students in my Seminar on Science Writing at Stevens Institute of Technology to write short responses to my book The End of War. Kimberly Parker, a sophomore majoring in mathematics, submitted the following essay, which so impressed and heartened me that Im sharing it with readers of this blog. John Horgan]. Our class was recently asked whether or not we felt particle physics research should receive public funding. The majority of us were opposed, our reasons being that such research has no practical value. An instrument as sophisticated and expensive as a particle collider is surely a waste of a nations resources.. So it might come as a surprise that plans to build a synchrotron particle collider in Jordan have received overwhelming support from countries in the Middle East, including Iran, Pakistan, the Palestinian Authority and Israel. Scientific discovery is not the only goal being pursued. Those ...

A well-preserved dinosaur skeleton from Mongolia unites an unexpected combination of features that defines a new group of semi-aquatic predators related to Velociraptor. Detailed 3-D synchrotron analysis allowed an international team of researchers to present the bizarre 75-million-year-old predator, named Halszkaraptor escuilliei. The study not only describes a new genus and species of bird-like dinosaur that lived in Mongolia but also sheds light on an unexpected amphibious lifestyle for raptorial dinosaurs ...

SLACs meeting facilities also provided a venue for the Homebrew Computer Club and other pioneers of the home computer revolution of the late 1970s and early 1980s. In 1984 the laboratory was named an ASME National Historic Engineering Landmark and an IEEE Milestone.[7]. SLAC developed and, in December 1991, began hosting the first World Wide Web server outside of Europe.[8]. In the early-to-mid 1990s, the Stanford Linear Collider (SLC) investigated the properties of the Z boson using the Stanford Large Detector. As of 2005, SLAC employed over 1,000 people, some 150 of whom were physicists with doctorate degrees, and served over 3,000 visiting researchers yearly, operating particle accelerators for high-energy physics and the Stanford Synchrotron Radiation Laboratory (SSRL) for synchrotron light radiation research, which was indispensable in the research leading to the 2006 Nobel Prize in Chemistry awarded to Stanford Professor Roger D. Kornberg.[9]. In October 2008, the Department of Energy ...

SLACs meeting facilities also provided a venue for the Homebrew Computer Club and other pioneers of the home computer revolution of the late 1970s and early 1980s. In 1984 the laboratory was named an ASME National Historic Engineering Landmark and an IEEE Milestone.[7] SLAC developed and, in December 1991, began hosting the first World Wide Web server outside of Europe.[8] In the early-to-mid 1990s, the Stanford Linear Collider (SLC) investigated the properties of the Z boson using the Stanford Large Detector. As of 2005, SLAC employed over 1,000 people, some 150 of whom were physicists with doctorate degrees, and served over 3,000 visiting researchers yearly, operating particle accelerators for high-energy physics and the Stanford Synchrotron Radiation Laboratory (SSRL) for synchrotron light radiation research, which was indispensable in the research leading to the 2006 Nobel Prize in Chemistry awarded to Stanford Professor Roger D. Kornberg.[9] In October 2008, the Department of Energy ...

TY - JOUR. T1 - The Structural Determinants Accounting for the Broad Substrate Specificity of the Quorum Quenching Lactonase GcL. AU - Bergonzi, Celine. AU - Schwab, Michael. AU - Naik, Tanushree. AU - Elias, Mikael H. N1 - Funding Information: This work was supported by the MnDrive Initiative, and BARD grant IS-4960-16 FR to M.E. This work was also prepared by M.E. using federal funds under award NA18OAR4170101 from Minnesota Sea Grant, National Sea Grant College Program, National Oceanic and Atmospheric Administration, U.S. Department of Commerce. The statements, findings, conclusions, and recommendations are those of the authors and do not necessarily reflect the views of NOAA, the Sea Grant College Program or the U.S. Department of Commerce. This paper is journal reprint no. JR659 of the Minnesota Sea Grant College Program. We thank the Advanced Photon Source and beamline staff for access and support (23 ID-B and 23 ID-D). Publisher Copyright: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, ...