The role of melatonin on zebrafish follicle development: An FT-IR imaging approach

The objective of our study was to prepare Y-, USY- and ZSM-5-based catalysts by hydrothermal synthesis, followed by copper active-phase deposition by either conventional ion-exchange or ultrasonic irradiation. The resulting materials were characterized by XRD, BET, SEM, TEM, Raman, UV-Vis, monitoring ammonia and nitrogen oxide sorption by FT-IR and Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). XRD data confirmed the purity and structure of the Y/USY or ZSM-5 zeolites. The nitrogen and ammonia sorption results indicated that the materials were highly porous and acidic. The metallic active phase was found in the form of cations in ion-exchanged zeolites and in the form of nanoparticle metal oxides in sonochemically prepared catalysts. The latter showed full activity and high stability in the SCR deNOx reaction. The faujasite-based catalysts were fully active at 200–400 °C, whereas the ZSM-5-based catalysts reached 100% activity at 400–500 °C. Our in situ DRIFTS experiments revealed that Cu–O(NO) and Cu–NH3 were intermediates, also indicating the role of Brønsted sites in the formation of NH4NO3. Furthermore, the results from our experimental in situ spectroscopic studies were compared with DFT models. Overall, our findings suggest two possible mechanisms for the deNOx reaction, depending on the method of catalyst preparation (i.e., conventional ion-exchange vs. ultrasonic irradiation).

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Quantification of plaque area and characterization of plaque biochemical composition with atherosclerosis progression in ApoE/LDLR−/− mice by FT-IR imaging

The Analyst ◽

10.1039/c3an01050c ◽

2013 ◽

Vol 138 (21) ◽

pp. 6645 ◽

Cited By ~ 20

Author(s):

Tomasz P. Wrobel ◽

Lukasz Mateuszuk ◽

Renata B. Kostogrys ◽

Stefan Chlopicki ◽

Malgorzata Baranska

Keyword(s):

Biochemical Composition ◽

Atherosclerosis Progression ◽

Plaque Area ◽

Ir Imaging ◽

Ft Ir

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A Simple Dissolved Metals Mixing Route to Prepare Nanostructured Mg0.8Zn0.2TiO3 Solid Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1112.47 ◽

2015 ◽

Vol 1112 ◽

pp. 47-52 ◽

Cited By ~ 4

Author(s):

Frida Ulfah Ermawati ◽

Suasmoro Suasmoro ◽

Suminar Pratapa

Keyword(s):

Solid Solution ◽

Particle Size ◽

Rietveld Analysis ◽

Dissolved Metals ◽

Intermediate Phases ◽

Particle Size Analyzer ◽

Ft Ir ◽

Xrd Patterns ◽

Zn Ions

A study of liquid mixing route to synthesize high purity Mg0.8Zn0.2TiO3 nanopowder, a candidate dielectric ceramics, has been successfully performed. Formation of the phases on the dried powder was studied using TG/DTA, XRD and FT-IR data. Rietveld analysis on the collected XRD patterns confirmed the formation of solid solution in the system. Such solid solution can be obtained from the powder calcined at 500 °C, but calcination at 550 °C gave rise to the most optimum molar purity up to 98.5% without intermediate phases. The role of Zn ions on the formation of solid solution was also discussed. Homogeneity of particle size distribution and nano-crystallinity of the system was verified from the particle size analyzer data, TEM image and the Rietveld analysis output.

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The Nude Mouse Skin Phenotype: The Role of Foxn1 in Hair Follicle Development and Cycling

Experimental and Molecular Pathology ◽

10.1006/exmp.2001.2386 ◽

2001 ◽

Vol 71 (2) ◽

pp. 171-178 ◽

Cited By ~ 51

Author(s):

Lars Mecklenburg ◽

Motonobu Nakamura ◽

John P. Sundberg ◽

Ralf Paus

Keyword(s):

Hair Follicle ◽

Nude Mouse ◽

Mouse Skin ◽

Follicle Development ◽

Hair Follicle Development

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EXPRESS: On the Limit of Detection in Infrared Spectroscopic Imaging

Applied Spectroscopy ◽

10.1177/00037028211050961 ◽

2021 ◽

pp. 000370282110509

Author(s):

Laurin Lux ◽

Yamuna Dilip Phal ◽

Pei-Hsuan Hsieh ◽

Rohit Bhargava

Keyword(s):

Limit Of Detection ◽

Protein Microarray ◽

Spectroscopic Imaging ◽

Single Frequency ◽

Systematic Analysis ◽

Protein Mass ◽

Ir Imaging ◽

Wide Range ◽

Ft Ir ◽

Processing Techniques

Infrared (IR) spectroscopic imaging instrumentsâ performance can be characterized and optimized by an analysis of their limit of detection (LoD). Here we report a systematic analysis of the LoD for Fourier transform IR (FT-IR) and discrete frequency IR (DFIR) imaging spectrometers. In addition to traditional measurements of sample and blank data, we propose a decision theory perspective to pose the determination of LoD as a binary classiï¬cation problem under different assumptions of noise uniformity and correlation. We also examine three spectral analysis approaches, namely absorbance at a single frequency, sum of absorbance over selected frequencies and total spectral distance â to suit instruments that acquire discrete or contiguous spectral bandwidths. The analysis is validated by reï¬ning the fabrication of a bovine serum albumin protein microarray to provide eight uniform spots from 2.8 nL of solution for each concentration over a wide range (0.05 -10 mg/mL). Using scanning parameters that are typical for each instrument, we estimate a LoD of 0.16 mg/mL and 0.12 mg/mL for wideï¬eld and line scanning FT-IR imaging systems, respectively, usingthespectraldistanceapproach,and0.22mg/mLand0.15mg/mL using an optimal set of discrete frequencies. As expected, averaging and the use of post-processing techniques such as minimum noise fraction (MNF) transformation results in LoDs as low as 0.075 mg/mL that correspond to a spotted protein mass of 112 fg/pixel. We emphasize that these measurements were conducted at typical imaging parameters for each instrument and can be improved using the usual trading rules of IR spectroscopy. This systematic analysis and methodology for determining the LoD can allow for quantitative measures of conï¬dence in imaging an analyteâs concentration and a basis for further improving IR imaging technology.

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An Essential Role of Polymeric Adhesives in the Reinforcement of Acidified Paper Relics

Polymers ◽

10.3390/polym14010207 ◽

2022 ◽

Vol 14 (1) ◽

pp. 207

Author(s):

Jiaojiao Liu ◽

Huiping Xing ◽

Yajun Zhou ◽

Xiaolian Chao ◽

Yuhu Li ◽

...

Keyword(s):

Essential Role ◽

Polyvinyl Butyral ◽

Scientific Basis ◽

Water Soluble ◽

Wheat Starch ◽

Protective Effects ◽

Ft Ir ◽

Starch Paste

Paper acidification causes paper relics to undergo embrittlement and decay, to form dregs, and even to break upon a single touch; therefore, reinforcement and deacidification treatments are essential steps for paper conservation and to retard the deterioration and prolong the life of objects. Polymeric adhesives play an essential role in reinforcement and deacidification treatments, although it is not well studied. In this work, the effect of polymeric adhesives on the conservation process and their protective effects on acidified paper relics were studied. Firstly, three polymeric adhesives, including wheat starch paste, polyvinyl butyral (PVB), and polyvinyl alcohol (PVA), were selected as research objects. Subsequently, their effects on four popular conservation methods were further discussed, including traditional mounting, hot-melt with silk net, alcohol-soluble cotton mesh, and water-soluble cotton mesh. Additionally, as an example, the reversibility and long-term durability of water-soluble adhesive PVA-217 were assessed. Using a computer measured and controlled folding endurance tester, pendulum tensile strength tester, tear tester, burst tester, FT-IR, video optical contact angle tester, and other instruments, the conservation application of water-soluble adhesives in paper relics was evaluated. This study provides a scientific basis and experimental data for the application of polymeric adhesives in the conservation of paper relics.

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The Role of Multimodality Imaging in Left-Sided Prosthetic Valve Dysfunction

Journal of Cardiovascular Development and Disease ◽

10.3390/jcdd9010012 ◽

2022 ◽

Vol 9 (1) ◽

pp. 12

Author(s):

Manuela Muratori ◽

Laura Fusini ◽

Maria Elisabetta Mancini ◽

Gloria Tamborini ◽

Sarah Ghulam Ali ◽

...

Keyword(s):

Prosthetic Valve ◽

Multimodality Imaging ◽

Integrated Approach ◽

Advanced Imaging ◽

Valve Dysfunction ◽

Clinical Presentations ◽

Imaging Approach ◽

Treatment Administration ◽

Life Threatening

Prosthetic valve (PV) dysfunction (PVD) is a complication of mechanical or biological PV. Etiologic mechanisms associated with PVD include fibrotic pannus ingrowth, thrombosis, structural valve degeneration, and endocarditis resulting in different grades of obstruction and/or regurgitation. PVD can be life threatening and often challenging to diagnose due to the similarities between the clinical presentations of different causes. Nevertheless, identifying the cause of PVD is critical to treatment administration (thrombolysis, surgery, or percutaneous procedure). In this report, we review the role of multimodality imaging in the diagnosis of PVD. Specifically, this review discusses the characteristics of advanced imaging modalities underlying the importance of an integrated approach including 2D/3D transthoracic and transesophageal echocardiography, fluoroscopy, and computed tomography. In this scenario, it is critical to understand the strengths and weaknesses of each modality according to the suspected cause of PVD. In conclusion, for patients with suspected or known PVD, this stepwise imaging approach may lead to a simplified, more rapid, accurate and specific workflow and management.

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The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl4- from Aqueous Solution

Indonesian Journal of Chemistry ◽

10.22146/ijc.23620 ◽

2017 ◽

Vol 17 (1) ◽

pp. 95 ◽

Cited By ~ 5

Author(s):

Sri Sudiono ◽

Mustika Yuniarti ◽

Dwi Siswanta ◽

Eko Sri Kunarti ◽

Triyono Triyono ◽

...

Keyword(s):

Aqueous Solution ◽

Humic Acid ◽

Peat Soil ◽

Sharp Decrease ◽

Hydroxyl Groups ◽

Mixed Solution ◽

Oh Groups ◽

Characterization Result ◽

Ft Ir

Humic acid (HA) extracted from peat soil according to the recommended procedure of the International Humic Substances Society (IHSS) has been tested to remove AuCl4- from aqueous solution. The removal was optimum at pH 2.0 and it was mainly dictated by attachment through hydrogen bonding to unionized carboxyl (–COOH) groups and reduction by the action of the hydroxyl (–OH) groups to gold (Au) metal. The removal of AuCl4- improved after HA was purified through repeated immersion and shaking in a mixed solution containing 0.1 M HCl and 0.3 M HF. When the purification led to the sharp decrease in ash content from 39.34 to 0.85% (w/w) and significant increase in both the –COOH and –OH contents from 3240 to 3487 mmol/kg and from 4260 to 4620 mmol/kg, respectively; the removal of AuCl4- improved from 0.105 to 0.133 mmol/g. This improvement of AuCl4- removal by the purified HA was accompanied by higher ability in reduction to Au metal. The attached AuCl4- on –COOH groups of both crude and purified HAs was qualitatively observed by the characterization result of FT-IR spectroscopy, while the presence of Au metal on the surface of those HAs was verified by the characterization result of XRD.

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