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Physical Sciences and Mathematics Commons™
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- Allosteric regulation (1)
- Arginine scanning mutagenesis (1)
- Atomic force microscopy (1)
- Capillary blood flow (1)
- Capillary oxygenation (1)
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- Cerebral cortex (1)
- Genesis solar samples (1)
- Non-destructive (1)
- Partial pressure of oxygen (1)
- Polysaccharide biosynthesis (1)
- Pyridoxal 5′-phosphate activation (1)
- Quantitative trace element analysis (1)
- Scanning electron microscopy (1)
- Solar wind (1)
- Sugar phosphate regulation (1)
- Surface analysis (1)
- TXRF (1)
- Total reflection X-ray fluorescence spectrometry (TXRF) (1)
- Total reflection x-ray fluorescence (1)
- Two-photon phosphorescence lifetime microscopy (1)
- Vapor-solid Diels-Alder reaction (1)
Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Mapping Of A Regulatory Site Of The Escherichia Coli Adp-Glucose Pyrophosphorylase, Jaina A. Bhayani, Benjamin L. Hill, Anisha Sharma, Alberto A. Iglesias, Kenneth W. Olsen, Miguel A. Ballicora
Mapping Of A Regulatory Site Of The Escherichia Coli Adp-Glucose Pyrophosphorylase, Jaina A. Bhayani, Benjamin L. Hill, Anisha Sharma, Alberto A. Iglesias, Kenneth W. Olsen, Miguel A. Ballicora
Chemistry: Faculty Publications and Other Works
The enzyme ADP-glucose pyrophosphorylase (ADP-Glc PPase) controls the biosynthesis of glycogen in bacteria and starch in plants. It is regulated by various activators in different organisms according to their metabolic characteristics. In Escherichia coli, the major allosteric activator is fructose 1,6-bisphosphate (FBP). Other potent activator analogs include 1,6-hexanediol bisphosphate (HBP) and pyridoxal 5′-phosphate (PLP). Recently, a crystal structure with FBP bound was reported (PDB ID: 5L6S). However, it is possible that the FBP site found is not directly responsible for the activation of the enzyme. We hypothesized FBP activates by binding one of its phosphate groups to …
Reaction Induced Morphology Changes Of Tetracene And Pentacene Surfaces, Feifei Li, Jacob W. Ciszek
Reaction Induced Morphology Changes Of Tetracene And Pentacene Surfaces, Feifei Li, Jacob W. Ciszek
Chemistry: Faculty Publications and Other Works
Morphology plays a critical role in determining the properties of solid-state molecular materials, yet fluctuates wildly as these materials undergo reaction. A prototypical system, a vapor–solid Diels–Alder reaction of tetracene and pentacene thin-films, is used to observe the evolution of morphology features as the reaction transitions from surface to bulk. The initial stages of reaction display little topographical change as measured by atomic force microscopy (AFM) and scanning electron microscopy (SEM), and substrates are coated with a uniform layer of product 1–2 molecules thick, as determined by energy-dispersive X-ray (EDX) spectroscopy. The highly textured surfaces of late stage reactions are …
More Homogeneous Capillary Flow And Oxygenation In Deeper Cortical Layers Correlate With Increased Oxygen Extraction, Baoqiang Li, Tatiana V. Esipova, Ikbal Sencan, Kıvılcım Kılıç, Buyin Fu, Michele Desjardins, Mohammad Moeini, Sreekanth Kura, Mohammad A. Yaseen, Frederic Lesage, Leif Østergaard, Anna Devor, David A. Boas, Sergei A. Vinogradov, Sava Sakadžić
More Homogeneous Capillary Flow And Oxygenation In Deeper Cortical Layers Correlate With Increased Oxygen Extraction, Baoqiang Li, Tatiana V. Esipova, Ikbal Sencan, Kıvılcım Kılıç, Buyin Fu, Michele Desjardins, Mohammad Moeini, Sreekanth Kura, Mohammad A. Yaseen, Frederic Lesage, Leif Østergaard, Anna Devor, David A. Boas, Sergei A. Vinogradov, Sava Sakadžić
Chemistry: Faculty Publications and Other Works
Our understanding of how capillary blood flow and oxygen distribute across cortical layers to meet the local metabolic demand is incomplete. We addressed this question by using two-photon imaging of resting-state microvascular oxygen partial pressure (PO2) and flow in the whisker barrel cortex in awake mice. Our measurements in layers I-V show that the capillary red-blood-cell flux and oxygenation heterogeneity, and the intracapillary resistance to oxygen delivery, all decrease with depth, reaching a minimum around layer IV, while the depth-dependent oxygen extraction fraction is increased in layer IV, where oxygen demand is presumably the highest. Our findings suggest that more …
Total Reflection X-Ray Fluorescence, Martina Schmeling
Total Reflection X-Ray Fluorescence, Martina Schmeling
Chemistry: Faculty Publications and Other Works
Total reflection X-ray fluorescence (TXRF) spectrometry is a non-destructive and surface sensitive multi-element analytical method based on energy dispersive X-ray fluorescence spectrometry with detection limits in the lower picogram range. It utilizes the total reflection of the primary X-ray beam at or below the critical angle of incidence. At this angle, the fluorescence intensity is substantially enhanced for samples present as small granular residue or as thin homogenous layer deposited at the surface of a thick substrate. Generally, two types of application exist: micro- and trace-analysis as well as surface and thin-layer analysis. For micro- and traceanalysis, a small amount …
X-Ray Fluorescence And Emission | Total Reflection X-Ray Fluorescence, Martina Schmeling
X-Ray Fluorescence And Emission | Total Reflection X-Ray Fluorescence, Martina Schmeling
Chemistry: Faculty Publications and Other Works
Total reflection X-ray fluorescence spectrometry (TXRF) is a trace elemental micro analysis technique based on conventional energy dispersive X-ray fluorescence. It has become increasingly popular in the last few decades and is applied in almost every field of trace elemental analysis where low detection limits and multi element capabilities are required. Like all X-ray techniques TXRF is non-destructive making it highly useful and important in areas where samples are precious and/or need to be available for further characterization. The ability of probing extremely small sample amounts makes TXRF a superior analytical technique for samples of limited amount. New table top …
Quantification Of Surface Contamination On Genesis Solar Wind Samples, Martina Schmeling
Quantification Of Surface Contamination On Genesis Solar Wind Samples, Martina Schmeling
Chemistry: Faculty Publications and Other Works
The Genesis mission was the only mission returning pristine solar material to Earth since the Apollo program up to date [1, 2]. Unfortunately, the return of the spacecraft on September 8, 2004 resulted in a crash landing shattering the solar wind collectors into small fragments and exposing them to desert soil and other debris at the landing site. To permit analysis of solar wind material embedded within a collector, surface cleaning is a necessity. Cleaning should remove surface contamination quantitatively, but leave the embedded solar wind intact. However, contamination varies from sample to sample and each fragment requires an individual …