Event calendar file
4-6 May 2011
Holiday Inn. Cuernavaca, Morelos.
America/Mexico_City timezone
- usuarios.luz@fis.unam.mx
Support
Home > Contribution List
Contribution List
Displaying 30
contributions
out of
30
The main ideas that make RIXS a very useful tool to study the electronic structure of solid compounds will be presented in this work. This photon-in photon-out technique allows a direct determination of symmetry and site selected density of states, both occupied and unoccupied. A basic experimental configuration and calculations using atomic multiplet models to interpret RIXS spectra will be discu
... More
Presented by Prof. Jose JIMENEZ-MIER
on
4 May 2011
at
11:10
Presented by Dr. Isaac HERNANDEZ CALDERON
on
5 May 2011
at
17:30
This talk will present an overview of gasphase experiments of molecular and atomic photoionization from the the standpoint of a user, at a synchrotron facility. The studies presented are specifically devoted to the study of single and double photoionization processes as well as photoelectron angular distributions. In addition to a brief overview of the physical processes studied, this presentation
... More
Presented by Dr. Antonio JUAREZ REYES
on
6 May 2011
at
11:45
Scanning Transmission X-Ray Microscopy (STXM) is a technique which has been rapidly advancing in the last decades. The study of soft and bio materials and the interaction between them and other matter is crucial nowadays, for both basic science and applied science. STXM provides a means to study the chemistry (molecular, interfacial, composition) of known or new materials at the nanoscale (< 30 nm
... More
Presented by Dr. Daniel HERNANDEZ-CRUZ
on
5 May 2011
at
16:30
The ciprofloxacin (1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperacinyl)-3-quinolinecarboxylic acid), is a wide spectrum antimicrobian from the second generation quinolones, due to its pharmacokinetic properties, it is considered as a good option for the treatment of multiple infections.
Zinc (Zn) is an essential trace element for all lifestyles and it is the most abundant intercellular ele
... More
Presented by Dr. Sánchez Vázquez ANA GUADALUPE
on
4 May 2011
at
18:20
En este trabajo se evaluaron los efectos atribuidos a algunos compuestos del Se y Cd en mezquite (Prosopis glandulosa) y coliflor (Brassica oleracea var. Botrytis) con la finalidad de estudiar la tolerancia que tienen estas plantas a los mismos. Además, se evaluó la toxicidad y el efecto de la interacción Cd-Se en dichas especies, para posteriormente evaluar el posible efecto protector del Se
... More
Presented by Dr. Gilberto GUTIÉRREZ-VÁZQUEZ
on
4 May 2011
at
17:50
Un estudio detallado de la estructura electrónica de la familia de compuestos
altamente correlacionados MF_2 (M=Cr-Zn) es hecha combinado espectroscopías de absorción (XAS) y emisión normal (NXES) y resonante inelástica (RIXS) de rayos X. Nuestros hallazgos muestran que a pesar de ser compuestos idealmente iónicos existe una fuerte covalencia (hibridación) entre los estados F2p y M3d alred
... More
Presented by Mr. Paul OLALDE VELASCO
on
4 May 2011
at
16:30
X-ray absorption spectroscopy (XAS) is a powerful local structural tool which rapidly prevailed in chemistry, biology and materials science, associated with the dedicated synchrotron radiation facilities (2nd generation storage rings) in the 1980’s. Severely limited applicability of conventional XAS, partricularly, sensitivity in transmission experiments was solved by a fluorescence detection, f
... More
Presented by Dr. Hiroyuki OYANAGI
on
4 May 2011
at
08:40
The advent of tunable, highly intense and bright synchrotron radiation, and technical advances in the last decades have provided an increasingly powerful source for a broad range of spectroscopic tools, including inelastic x-ray scattering (IXS), for materials research. The construction of dedicated facilities that routinely deliver x-ray beams with µm focal size, energy resolution down to ~meV,
... More
Presented by Dr. Yong CAI
on
4 May 2011
at
09:40
Light weight nanoporous solids of coordination polymers type, among them metal-organic frameworks, are receiving an increasing attention because of their promising properties for hydrogen and methane storage, carbon dioxide sequestering, separation capability for mixtures of gases and vapors, catalysis, etc. The porous structure of these materials can be tailored according to the application requi
... More
Presented by Dr. Edilso REGUERA
on
5 May 2011
at
15:30
Over the last decades my laboratory has developed and applied microscopy and spectroscopy techniques for in situ studies of the surface structure of catalysts in the presence of various gases. These include high pressure Scanning Tunneling Microscopy (HP-STM), in situ x-ray spectroscopies using Synchrotron radiation. These include high pressures x-ray absorption (XAS) and X-ray photoelectron spect
... More
Presented by Dr. M. SALMERON
on
5 May 2011
at
08:30
In this talk I will motivate why and when a synchrotron is a desirable infrared source for FTIR spectroscopy and microscopy. I will then present a series of scientific examples spanning many disciplines from Biology to Physics to Chemistry to Environmental Science. Infrared beamlines are part of every new synchrotron being built world-wide because they are cost-effective and produce high-impact
... More
Presented by Dr. Michael MARTIN
on
6 May 2011
at
08:30
Synchrotron-light investigation of multiferroics, from atomic- to meso-scales, is characterized.
The information contained in diffraction peaks gives the long-range space-time average structure. It provides the general structure diagram, precise lattice parameters and average atomic positions. In synchrotron applications, diffraction is highly sensitive to symmetry breaking. Space/time deviatio
... More
Presented by Dr. Luis E. FUENTES-COBAS
on
4 May 2011
at
16:00
Non destructive characterization of cultural heritage has been carried out in the last decade systematically in Mexico. An interdisciplinary group, the ANDREAH network (Red de Análisis No Destructivo para el Estudio del Arte, la Arquelogía y la Historia), formed mainly by scientists, conservators and archaeologists of the UNAM and INAH has been developed to study all kind of materials: Pottery,
... More
Presented by Dr. Jose Luis RUVALCABA SIL
on
6 May 2011
at
12:15
We have performed systematic studies of the edge enhancement observed
in digital images of cylindrical plastic phantom objects obtained with
x-ray tubes. Geometrical conditions are those encountered in
commercial mammography units (focal spot size= 100 micrometers, total
source-to-detector distance 66 cm) and in a laboratory setup
(microfocus X-ray tubes, distances up to 1 m). We observe
... More
Presented by Dr. Brandan MARÍA ESTER
on
6 May 2011
at
11:00
combination of an ion-beam end station with synchrotron raditation in
the energy range of 23 to 32 electron volts was used to measure a high
resolution ion-yield spectrum of the ionization of single charged into
double charged Kr ions. Several atomic states are resolved and idenfied.
In addition, the absolute total cross section was measured.
This particular system is of relevance in a
... More
Presented by Dr. Guillermo HINOJOSA
on
6 May 2011
at
12:45
Presented by Dr. Matías MORENO
on
4 May 2011
at
12:15
Protein crystallography has been the most successful technique for
determining 3D structures from protein molecules. However, the technique
has several disadvantages including the need of a crystalline sample,
radiation damage and a static, averaged on time and space, resulting
model. Radiation damage is unavoidable and is one of the limiting steps
to estimate phases by anomalous methods
... More
Presented by Dr. Eugenio DE LA MORA
on
5 May 2011
at
18:20
La difracción de rayos-X (DRX) por sincrotrón fue utilizada para cuantificar con más precisión la mezcla de fases presentes en la composición en estudio. La caracterización estructural de la composición (SnPb0.4In0.6)Ba3Tm2Cu7O20, se realizó por medio de la técnica de difracción de rayos X, de alta resolución. Un análisis detallado del difractograma presentó los siguientes compuestos
... More
Presented by Mr. Joel M. ESTRADA
on
5 May 2011
at
18:00
Protein crystallography is the unsurpassable technique to obtain atomic resolution of biological entities. Those entities can have molecular masses from 6 kDa like the Immunoglobulin-binding domain B1 of streptococcal protein G (GB1) to MDa like the ribosome. In the last 15 years, a number of specific technologies like crystal freezing, SAD and MAD phasing using metals or selenium containing rec
... More
Presented by Dr. Luis BRIEBA
on
5 May 2011
at
11:30
The synthesis of materials can be affected when it is performed under extreme pressure and temperature. For instance, high pressures reduce the bond distances altering the electronic properties of the material, allowing the formation of new bonds or the formation of different molecular or atomic arrangements. These variations can promote changes in physical and chemical properties of both reagents
... More
Presented by Dr. Erick JUAREZ-ARELLANO
on
5 May 2011
at
16:00
Genome sequencing projects rapidly expand protein sequence space and allow comprehensive approaches to studies of entire cellular systems. The accumulation of sequence data has accelerated significantly and now includes studies of microbiomes and metagenomes. However, many aspects of protein function, including molecular recognition, assembly and catalysis, depend on the 3D atomic structure. Prot
... More
Presented by Dr. Andrzej JOACHIMIAK
on
5 May 2011
at
09:30
The synchrotron source provides a unique opportunity for biomedical research in both imaging and therapy research and applications. A general purpose biomedical research facility has been built at the Canadian Light Source in Saskatoon, Saskatchewan. The Biomedical Imaging and Therapy (BMIT) beamline complex at the Canadian Light Source is transitioning from construction to operations. The bend
... More
Presented by Prof. Dean CHAPMAN
on
6 May 2011
at
09:30
The ID21 at ESRF is a beamline dedicated to X-ray and FTIR micro-spectroscopy. Localization and speciation of trace elements is primarily done using micro-X-ray fluorescence (µXRF) and micro X-ray absorption spectroscopy (µ-XANES) in the tender X-ray domain (2-9.2 keV). Typical scientific questions concern the co-localization and/or speciation of trace elements in heterogeneous matrices at the s
... More
Presented by Dr. Castillo-Michel HIRAM
on
4 May 2011
at
17:30
This work is focused in sample preparation, analysis and data interpretation of XAS spectra from environmental samples. Sample preparation is explained for particulate matter, soil, plants and mine tailings. The elements analyzed in the different samples include As, Pb, Cr, Fe, Br, Cu, Se, S and Au. Suggestions for XAS data acquisition will be discussed.
Presented by Dr. Gustavo CRUZ-JIMENEZ
on
4 May 2011
at
13:15
Radiation damage to cryocooled protein crystals during x-ray structure determination has become an inherent part of macromolecular diffraction data collection at third-generation synchrotrons. Although it is possible to make use of this damage, for example for radiation damage-induced phasing (RIP), in the majority of cases radiation damage is an unwelcome part of data collection. X-rays interact
... More
Presented by Dr. Rudiño-Piñera ENRIQUE
on
5 May 2011
at
12:45
La espectroscopía de absorción de rayos X (XAS) ha sido especialmente útil para obtener información relacionada con los posibles mecanismos de absorción y tolerancia de metales en plantas. Con esta herramienta se determinó que en plantas de médano germinadas y desarrolladas en un medio conteniendo Cd, éste elemento se encuentra enlazado a O y S. Estudios posteriores determinaron que ácido
... More
Presented by Dr. Guadalupe DE LA ROSA
on
4 May 2011
at
12:45
Aldehyde dehydrogenases (ALDHs) are a group of ubiquos and ancient enzymes that catalyze the oxidation of a broad variety aldehydes to their corresponding carboxylic acids with the concomitant reduction of NAD(P)+ to NAD(P)H. Their catalytic mechanism involves three chemical steps: (1) the nucleophilic attack of the catalytic cysteine on the aldehyde substrate resulting in formation of the hemithi
... More
Presented by Dr. Lilian GONZÁLEZ-SEGURA
on
5 May 2011
at
13:15
We discuss the basic principles of the process of x-ray absorption in condensed systems. It is shown how x-ray absorption spectroscopy (XAS) can be used to determine both local atomic structure and local electronic structure in materials. We discuss the use of x-ray absorption fine structure (XAFS) in crystalline materials in which the interaction between electrons and ions produces changes in th
... More
Presented by Dr. Mustre JOSÉ
on
4 May 2011
at
15:30
Durante 15 años el autor ha usado la radiación sincrotrón en diferentes centros de altas energías del mundo. En este trabajo, se presentan los resultados más relevantes y la obtención de datos de estructuras de proteínas acoplados al desarrollo de métodos de crecimiento de cristales, que han mostrado como la calidad cristalina, permite obtener datos de alta resolución y dan respuesta a mu
... More
Presented by Prof. ABEL MORENO-CARCAMO
on
5 May 2011
at
12:15
