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Contrast-Enhanced MR Angiography of Subclavian Steal ...

2019-9-15 · resolution TOF localizer confirms the diagnosis of subclavian steal without additional imaging. hree-dimensional contrast-enhanced MR angiography (3D CEMRA) has virtually eliminated catheter arteriography for a variety of indi-cations, including evaluation of extracranial vasculature [1] and great vessels [2]. High-res-

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Combination of two matrices results in improved ...

2020-3-6 · A new sample preparation method for MALDI based on the use of a mixture of the two commonly used matrices, DHB and CHCA, is described. The matrix mixture preparation results in increased sequence coverage and spot-to-spot reproducibility for peptide mass mapping compared to the use of the single matrix components. This results in more reliable protein identification in proteomics …

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The Promotional Effect of Gold in Catalysis by …

2005-10-14 · Acetoxylation of ethylene to vinyl acetate (VA) was used to investigate the mechanism of the promotional effect of gold (Au) in a palladium (Pd)-Au alloy catalyst. The enhanced rates of VA formation for low Pd coverages relative to high Pd coverages on Au single-crystal surfaces demonstrate that the critical reaction site for VA synthesis consists of two noncontiguous, suitably spaced, Pd ...

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Spectroscopic evidence on the acetonitrile cleavage at ...

Acetonitrile is the famous common organic solvents that has been known stable and inert. We provide the evidence on the decomposition of acetonitrile on gold surfaces without electrochemical treatment. SERS and TOF-SIMS measurement reveal that the cyanide species can be plasmonically produced on gold …

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The Switch Is On: from Triple Quadrupoles and Q-TOF to ...

2017-9-12 · calibration.8 Internal lock masses can be used to further improve mass measurement and stability. According to Dr. Hudson, a feature of the Q Exactive Focus MS, as with all instruments in the Q Exactive range, is the ability to rapidly switch polarity. Though possible for MS/ MS systems, this is not possible with Q-TOF systems.

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Pros and Cons of Three High-Resolution Mass Spec ...

2017-6-8 · Mass spectrometry (MS) measures the mass (m) to charge (z) ratio—m/z—of the ions in a sample.Those ratios provide an atomic signature for what makes up a sample. In many situations, z = 1, so the ratio provides the mass of the ions. In original instruments, the mass could only be measured to single-digit units, or integers.

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The treatment of copper–gold ores by ammonium …

Researchers have used an oxidative ammoniacal solution as a pre-treatment to enhance the leaching of sulphides gold ore through the partial decomposition to expose the gold minerals to leaching [1].

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DEM Simulation of Laboratory-Scale Jaw Crushing of a …

2020-8-14 · Jaw crushers are widely used in the primary crushing stage and, sometimes, even in the secondary for many applications, including the processing of metallic, non-metallic, energetic, and industrial minerals, as well as in the processing of construction and demolition waste.

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Application of SELDI-TOF-MS Coupled With an …

Four hundred and fifty-five serum samples were tested by SELDI-TOF-MS matching on a gold chip. Samples were assigned to 1 of 2 subsets according to collection order, viz., a training set, and a testing set. The training set was used to identify statistically significant peaks and to develop the artificial neural network (ANN) model for ...

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Evaluation of three sample preparation methods for …

2017-1-18 · Patient mortality is significantly reduced by rapid identification of bacteria from sterile sites. MALDI-TOF can identify bacteria directly from positive blood cultures and multiple sample preparation methods are available. We evaluated three sample preparation methods and two MALDI-TOF score cut-off values. Positive blood culture bottles with organisms present in Gram stains were ...

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Matrix-assisted laser desorption/ionization time-of …

2020-3-7 · The success of matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry for the characterization of polymer structures and for the determination of average molecular weights and distributions depends on the use of a proper sample/matrix preparation protocol. This work examines the effect of solvents, particularly solvent mixtures, used to prepare polymer, …

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Label-Free Electrochemical Microfluidic Chip for the ...

2020-6-20 · used for routine screening. The primary objective of the current study is to develop an automated electrochemical microfluidic chip (EMC) for simple and rapid AST. The microfluidic channels and gold microelectrodes were designed for the automation of antibiotic mixing and distribution in multiple test chambers and for electrical signal measurements.

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Thoughts on the use of gold-based catalysts in ...

2017-1-24 · The use of gold-titania catalysts in cleaning hydrogen containing carbon monoxide has received considerable attention in preferential oxidation (PROX) studies [11, 12], and it has even been shown that incorporating the gold catalyst within the electrode assembly is completely successful in enabling polymer electrolyte membrane (PEM) fuel cells to run on 1% CO in hydrogen feed over …

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Doping of thiolate protected gold clusters through ...

A novel method to dope thiolate protected gold nanoclusters is presented where metal surfaces of silver, copper and cadmium were used to dope Au 25 and Au 38 nanoclusters, respectively in a cluster–surface metal exchange reaction. A strong difference in the doping behaviour of these clusters was detected depending on the nature of the metal surface used.

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Diagnostic Accuracy of Magnetic Resonance …

2008-6-12 · Of these papers, 37 TOF MRA 17,18,26–60 and 21 CE MRA papers 16,26,27,33,35,37,61–75 fulfilled the inclusion criteria (Tables 1 and 2). Of the TOF papers, 11 used 2D TOF MRA, 14 used 3D TOF MRA, and 12 included both 2D and 3D TOF data . For TOF MRA, there were 1651 subjects, whereas for CE MRA, there were 1047 subjects.

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Acceleromyography for Use in Scientific and Clinical ...

An alternative approach is used in two acceleromyograph models (TOF-Watch® and TOF-Watch® S) intended for use in the daily clinic.7These monitors automatically change the way the TOF ratio is calculated, ensuring that the displayed TOF value never exceeds . By definition, the TOF ratio is the height of the fourth twitch divided by the ...

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Analysis of Surface Bound Organic Ligands on Gold ...

2021-5-10 · Analysis of CTAB modified gold particles in positive mode showed the [M+H]+ ion and the ion resulting from loss of a methyl group [M-CH 3 +H]+ (Fig. 2). The standard solution of branched polyethyleneimine (BPEI) that was used to modify the gold nanomaterials was analyzed by DSA-TOF. The spectrum of BPEI was characteristic of a polymer

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Assessing the potential of sputtered gold nanolayers …

2018-12-12 · The gold peaks used for the calibration of this spectrum are also indicated. As can be seen, the gold nanolayers are able to promote the desorption/ionization of different metabolites throughout a wide mass range. A total of 356 peaks were detected with a S/N>5, with a TIC of 2.63x10 5.

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Biomedicines | Free Full-Text | Strategies for the ...

Metals and inorganic compounds have been used for medicinal purposes since ancient times [1,2].However, only with the advent of modern medicine in the early 20th century, were metallodrugs first used on a scientific basis for the treatment of several diseases, including bacterial and parasitic infections [1,3,4].More recently, with the rapid improvement of organic synthetic chemistry and the ...

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The Difficult Mineral Processing Issues with Processing ...

2017-5-31 · wet and sticky. Cone crushers bridge and screens become blinded. > Putting clay ores into bins or stockpile with reclaim tunnels can be a disaster. They simply don''t work. Feeding direct into SAG mills is a much better option if this suits the process. > Scrubbers ahead of crushing

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Selected Bioinformatic Tools and MS (MALDI-TOF, …

2017-1-29 · Also the procedure of preparation of samples obtained from cut out protein spots for analysis with the MALDI-TOF MS and peptide mass fingerprinting (PMF) technique is presented. Among oat prolamins separated with the 2-DE technique ( see Chapter 17 ), 13 protein spots are considered to be the most characteristic (range of MW 27.0–34.6 kDa, p ...

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Characterization of covalent crosslinking strategies for ...

2019-7-10 · An adapted strategy from the conventional 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) crosslinking method was developed to form a covalently coupled phosphoramidated single stranded DNA (ssDNA). Matrix assisted laser desorption ionization-time of flight (MALDI-TOF) results demonstrated that the phosphoramidated ssDNA conjugate is stable for several days, and that ...

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Ultrasensitive SERS aptasensor for the detection of ...

2017-4-1 · Herein, a nano-biosensor based on gold nanoparticles (AuNPs) with stem-loop DNA modification as SERS-active substrate for the detection of fg/mL level of OTC in food matrices was developed. The 13 nm AuNP was bonded exclusively to the 80 nm AuNP utilizing a 56 mer single-stranded stem-loop DNA (ssDNA) sequence containing the aptamer of OTC.

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(PDF) Integrated Approaches for the Study of Real …

TOF-SIMS and XPS analyses were used to analyse the surface of the compositionally zoned Fe pyrochlore grains, in order to link collector adsorption to Fe contents and identify potential mechanisms ...

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Diagnosis of biofilm infections: current methods used ...

2021-2-24 · However, due to several problems and limitations of this technique, MALDI-TOF is far from being the gold standard for identifying biofilm formation. A common problem encountered by researchers is that the same microorganisms may present different mass spectra when analysed repeatedly (Singhal et al. 2015). Another limitation of the technique is ...

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MALDI‐TOF MS: an upcoming tool for rapid detection …

2013-10-1 · 1 Introduction. MALDI-TOF MS profiling for microorganism detection has already been demonstrated in the 1990s 1-3, but has evolved to the first-line identification method in many laboratories just during the past five years.The technique, in combination with adopted software and reference databases, now has become a routine tool for microorganism identification in the microbiology …

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ACP

The nitrate CI-APi-TOF has been increasingly used for the measurement of low-volatility organic compounds (LVOCs) and extremely low-volatility organic compounds (ELVOCs; Ehn et al., 2014; Hyttinen et al., 2015; Jokinen et al., 2014), which mostly have a high O∕C ratio. The resolving power of the nitrate CI-APi-TOF …

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MALDI-TOF mass spectrometry and high-resolution …

2021-4-17 · The -PCR assay used universal mycoplasma primers for the 16S –23S intergenic spacer region (IGSR). Results: The resulting melting profiles of the field isolates were indistinguishable from the reference strain, indicating accurate identification. For the MALDI-TOF MS, each M. bovis isolate was accurately identified. Mycoplasma arginini and

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High resolution imaging and 3D analysis of Ag ...

2019-6-5 · nation of high lateral and high mass resolutions. A lateral res-olution of 400nm and a mass resolution of 10000 at m/z 385.4 using delayed extraction were shown by Vanbellingen et al. on tissue sections.11 The principle of delayed extraction is commonly used in the MALDI community to reduce the uncontrolled decay of molecular ions in the extraction

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Lidocaine Infusion Improves the Functionality of ...

Nerveana® nerve locator system were used for IONM during surgery. Results: The proportion of patients requiring lower strength stimu-lating current (StMC) at 0.5 mA was significantly higher in the LG ... (TOF) monitor (Microstim Plus, Neurotechnology, Houston, ... RLN was the gold standard for the study. The DAIL at the end of surgery was ...

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Recent advancements in glycoproteomic studies ...

2021-1-3 · The instrument used was au AutoFlexIII LRF200-CID TOF (Bruker). The concentrations of sample solutions loaded onto the MALDI target were of the order of 10 ng/µl. A study by H. Xiao et al. ( 2018 ) employed an improved glycan enrichment method by conjugating dendrimer beads with a BA derivative, benzoboroxole.

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MALDI-TOF mass spectrometry provides high …

2017-3-24 · Salmonella can cause global foodborne illnesses in humans and many animals. The current diagnostic gold standard used for detecting Salmonella infection is microbiological culture followed by serological confirmation tests. However, these methods are complicated and time-consuming. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF …

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Species identification of Enterococcus spp: Whole …

For both MALDI‐TOF instruments, the direct method was used for identification. The mass spectrometers were the Microflex system with Biotyper software 3.1 (Biotyper; Bruker Daltonics) and the Vitek MS system (BioMérieux) with the software MYLA ver 4.6.1. Both instruments were used according to the manufacturer''s instructions.

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