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2021 ◽  
Vol 274 ◽  
pp. 115474
Author(s):  
M.A. Zubair ◽  
F.A. Mozahid ◽  
H. Takeda ◽  
A.K.M.A. Hossain

2021 ◽  
Vol 122 ◽  
pp. 111657
Author(s):  
J. Bhemarajam ◽  
P. Syam Prasad ◽  
M. Mohan Babu ◽  
M. Prasad

2021 ◽  
Vol 515 ◽  
pp. 230622
Author(s):  
Lu Gao ◽  
Haoran Liang ◽  
Jianxin Li ◽  
Bowen Cheng ◽  
Nanping Deng ◽  
...  

2021 ◽  
Vol 7 (42) ◽  
Author(s):  
Zdeněk Tošner ◽  
Matthias J. Brandl ◽  
Jan Blahut ◽  
Steffen J. Glaser ◽  
Bernd Reif

2021 ◽  
pp. 1-12
Author(s):  
Kevin Tanner ◽  
Gabriel Marineau-Plante ◽  
Adrien Schlachter ◽  
Paul-Ludovic Karsenti ◽  
Armand Soldera ◽  
...  

Five new gold complexes 4-ROC6H4C≡CAuN≡CC6H4-4-OR′ (R/R′ = CH3/C9H19 (C1N9 ), C15H31/C9H19 (C15N9 ), C6H13/C15H31 (C6N15 ), C9H19/C15H31 (C9N15 ), C12H25/C15H31 (C12N15 )) were synthesized and characterized (1H and 13C NMR, IR, Raman spectroscopy, and high resolution mass spectrometry). Their organized smectic phases were investigated by TGA, DSC, powder XRD, and polarized light optical microscopy, and the solids are found to have crystalline and amorphous domains. No evidence for Au•••Au interactions was observed. The steady state and time-resolved absorption and emission properties at 298 and 77 K were examined, and surprisingly, the excited lifetime of the triplet excited state in the solid state is extremely short-lived (<100 ps) in comparison with the microsecond time scale recorded for the solution and at 77 K. The photosensitization of 1O2 was observed in solution but not in the solid state. The nature of the singlet (ligand-to-ligand charge transfer) and triplet (ethynyl/intraligand ππ*) excited states were assessed using DFT and TD-DFT computations. The thermal and UV-photochemical formation of gold nanoparticles were performed in solution (slow) and in the solid state (faster). The thermally generated nanoparticles are found to be larger (2–20 nm; TEM) and exhibit well-defined shapes, whereas the photochemically generated ones are smaller (1–10 nm) and show ill-defined shapes.


Author(s):  
Gary Wolfowicz ◽  
F. Joseph Heremans ◽  
Christopher P. Anderson ◽  
Shun Kanai ◽  
Hosung Seo ◽  
...  
Keyword(s):  

Author(s):  
Renan Dezena

Reference chemical substances called primary reference are used which are marketed by official compendia both nationally and internationally in the pharmaceutical industry as a tool for identification and quantification during pre-formulation, development/analytical validation and quality control studies. The reference or primary standards are almost always imported and resold in the Brazilian market as a consequence, increasing the cost in relation to the sample amount (little amount of mass in mg per bottle). On July 24, 2017, the National Health Surveillance Agency (ANVISA) published the Resolution of the Collegiate Board (RDC) number 166, which deals with the validation of analytical methods. The Chapter III of this resolution is intended for reference chemical substances and, in Art. 14 § 1, the RDC 166/2017 allows the use of characterized reference chemical substances in the analytical validations. The characterization study is planned according to the chemical structure of the substance to be characterized and within this new regulation, solid-state characterization and analytical chemistry stands out as an essential ally corroborating with the evolution of the number of publications in the literature regarding this subject in the google scholar database as shown in Figures 1 and 2.


ChemNanoMat ◽  
2021 ◽  
Author(s):  
Wenchao Liao ◽  
Chen Liu

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2869
Author(s):  
Cecylia Wardak ◽  
Karolina Pietrzak ◽  
Małgorzata Grabarczyk

A new copper sensitive all solid-state ion-selective electrode was prepared using multiwalled carbon nanotubes-ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) nanocomposite as an additional membrane component. The effect of nanocomposite content in the membrane on the electrode parameters was investigated. The study compares, among others, detection limits, sensitivity, and the linearity ranges of calibration curves. Content 6 wt.% was considered optimal for obtaining an electrode with a Nernstian response of 29.8 mV/decade. An electrode with an optimal nanocomposite content in the membrane showed a lower limit of detection, a wider linear range and pH range, as well as better selectivity and potential stability compared to the unmodified electrode. It was successfully applied for copper determination in real water samples.


Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6201
Author(s):  
Yanli Zhang ◽  
Xinyan Zhang ◽  
Wenru Kong ◽  
Shuqi Wang

Caveolin-1 (CAV1), a membrane protein that is necessary for the formation and maintenance of caveolae, is a promising drug target for the therapy of various diseases, such as cancer, diabetes, and liver fibrosis. The biology and pathology of caveolae have been widely investigated; however, very little information about the structural features of full-length CAV1 is available, as well as its biophysical role in reshaping the cellular membrane. Here, we established a method, with high reliability and reproducibility, for the expression and purification of CAV1. Amyloid-like properties of CAV1 and its C-terminal peptide CAV1(168-178) suggest a structural basis for the short linear CAV1 assemblies that have been recently observed in caveolin polyhedral cages in Escherichia coli (E. coli). Reconstitution of CAV1 into artificial lipid membranes induces a caveolae-like membrane curvature. Structural characterization of CAV1 in the membrane by solid-state nuclear magnetic resonance (ssNMR) indicate that it is largely α-helical, with very little β-sheet content. Its scaffolding domain adopts a α-helical structure as identified by chemical shift analysis of threonine (Thr). Taken together, an in vitro model was developed for the CAV1 structural study, which will further provide meaningful evidences for the design and screening of bioactive compounds targeting CAV1.


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