Tag: M.W=300-350

Cupane, A. published the artcileTwo-dimensional electronic spectroscopy signatures of the glass transition, Computed Properties of 10510-54-0, the publication is Spectroscopy (Amsterdam, Netherlands) (2010), 24(3,4), 393-397, database is CAplus.

Two-dimensional electronic spectroscopy is a sensitive probe of solvation dynamics. Using a pump-probe geometry with a pulse shaper [Optics Express 15 (2007), 16681-16689; Optics Express 16 (2008), 17420-17428], we present temperature dependent 2D spectra of laser dyes dissolved in glass-forming solvents. At low waiting times, the system has not yet relaxed, resulting in a spectrum that is elongated along the diagonal. At longer times, the system loses its memory of the initial excitation frequency, and the 2D spectrum rounds out. As the temperature is lowered, the time scale of this relaxation grows, and the elongation persists for longer waiting times. This can be measured in the ratio of the diagonal width to the anti-diagonal width; the behavior of this ratio is representative of the frequency-frequency correlation function [Optics Letters 31 (2006), 3354-3356]. Near the glass transition temperature, the relaxation behavior changes. Understanding this change is important for interpreting temperature-dependent dynamics of biol. systems.

Spectroscopy (Amsterdam, Netherlands) published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, Computed Properties of 10510-54-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhang, Yanhui published the artcileRegulation of MRI contrast and cellular retention time by cellular interfacial distribution of Gd agents: Implications for stem cell tracking, Recommanded Product: Fmoc-Pro-OH, the publication is Magnetic Resonance Letters (2022), 2(1), 48-55, database is CAplus.

Human mesenchymal stem cells (hMSCs) were labeled with Dotarem or (Gd-DOTA)2- EM7 (EM7Gd2) via electroporation (EP). Cellular transmission electron microscopy (TEM) reveals free distribution of Gd agents and formation of EM7Gd2 clusters in the cytosol. Cellular magnetic resonance imaging (MRI) reveals that the free Gd agents induce MRI signal enhancement effect due to its fast exocytosis and subsequent interaction with intercellular water mols. The EM7Gd2 clusters exhibits a longer intracellular retention time and induce a persistent MRI signal reduction effect. The cellular MRI results are interpreted by taking into account both T1 and T2 relaxation rates and their correlation with cellular binding structures of Dotarem and EM7Gd2.

Magnetic Resonance Letters published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C9H9BO2, Recommanded Product: Fmoc-Pro-OH.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ivashkin, Pavel published the artcile[¹⁸F]CuCF₃, a [¹⁸F]trifluoromethylating agent for aryl boronic acids and aryl iodides, Application In Synthesis of 17351-62-1, the publication is Chemistry – A European Journal (2014), 20(31), 9514-9518, database is CAplus and MEDLINE.

Positron emission tomog. has emerged as the leading method for medical imaging with fluorine-18 as the most widely used radioactive isotope. Here we report a semi-automated method for the preparation of valuable [¹⁸F]trifluoromethylcopper, as well as its use for the radiosynthesis of [¹⁸F]trifluoromethylarenes and heteroarenes. Mild conditions of [¹⁸F]trifluoromethylation make this method particularly useful for the radiosynthesis of pharmacol. relevant [¹⁸F]trifluoromethylarenes and heteroarenes. The structure of S-difluoromethyl-S-mesityl-S-phenylsulfonium tetra(3,5-bis(trifluoromethyl)phenyl)borate was established on the basis of the spectroscopic anal. and confirmed by the single crystal x-ray diffraction anal. [triclinic, space group P-1, a 12.690(3), b 12.842(3), c 17.467(4) ?, ¦Á 86.163(4), ¦Â 80.586(4), ¦Ã 70.463(4)¡ã, V 2646.2(1) ?³, Z 2].

Chemistry – A European Journal published new progress about 17351-62-1. 17351-62-1 belongs to catalysis-chemistry, auxiliary class Salt,Amine, name is Tetrabutylammonium hydrogencarbonate, and the molecular formula is C17H37NO3, Application In Synthesis of 17351-62-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Medrano, Mayte published the artcileCD4⁺ and CD8⁺ T-cell responses in bone marrow to fatty acids in high-fat diets, Formula: C22H32O2, the publication is Journal of Nutritional Biochemistry (2022), 109057, database is CAplus and MEDLINE.

Obesity is associated with disruptions in the adaptive immune system; however, dietary fatty acids in high-fat diets (HFDs) that induce obesity have consequences that are currently unclear regarding T-cell maintenance in bone marrow (BM). C57BL/6J mice were randomly assigned to isocaloric HFDs formulated with dietary fats rich in saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), or MUFAs supplemented with eicosapentaenoic and docosahexaenoic acids for 20 wk, followed by an anal. of the immunophenotypic feature of lymphocytes (CD3⁺) T and their subsets CD4⁺ and CD8⁺ T cells in spleen and BM, identification of fatty acids in BM extracellular fluid and anal. of the correspondence between fatty acids with the frequency of T-cell subsets in BM. Splenic CD3⁺ T cells were reduced irresp. of HFDs. In BM, CD3⁺ T cells were reduced after HFD-SFAs, while CD4⁺ T cells were increased after HFDs enriched in MUFAs and CD8⁺ T cells were reduced irresp. of HFDs. In BM extracellular fluid, the content of palmitic and myristic acids increased after HFD-SFAs and that of oleic acid increased after HFDs enriched in MUFAs. There was a statistical correspondence between HFD-induced changes in fatty acids in BM extracellular fluid and HFD-induced changes in the frequency of CD3⁺ and CD4⁺ T cells in BM. These findings reveal an undervalued critical role for dietary fatty acids in the selective acquisition of T-cell subsets in BM, highlighting that oleic acid existing in the surroundings of T-cell niches during HFD-induced obesity could be instrumental in the maintenance of CD4⁺ T cells.

Journal of Nutritional Biochemistry published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, Formula: C22H32O2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhang, Wenwen published the artcileSynthesis of cross-linked triple shape memory polyurethane with self-healing functionalities, Recommanded Product: 2,2′-Dithiodibenzoic acid, the publication is Polymer Testing (2021), 107099, database is CAplus.

A series of shape memory polymers (SMPs) comprising poly (10-hydroxydecanoate) (PHDA) and polyethylene glycol (PEG) oligomer were facilely prepared The effect of PEG content on the thermal dynamic properties of the crosslinking network were studied by differential scanning calorimetry (DSC) and dynamic mech. anal. (DMA). The obtained polyurethane has two separated melting temperatures (T_m), which make the material a triple SMP. The shaped specimen only needs 8 s to get a 98.5% the shape recovery. Furthermore, disulfide bonds were introduced into the polyurethane to give the triple SMP self-healing ability. The synthetic polymer exhibited a self-healing efficiency of 78.3%. The healed samples could lift a weight of 100 g, which is 150 times of its own weight, without tearing. This polyurethane exhibits impressive triple-shape memory ability and a high potential for biomedical applications.

Polymer Testing published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is C10H16O2, Recommanded Product: 2,2′-Dithiodibenzoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhang, Zhengxing published the artcileSynthesis and evaluation of ¹⁸F-labeled 4-nitrobenzyl derivatives for imaging tumor hypoxia with positron emission tomography: Comparison of 2-[¹⁸F]fluoroethyl carbonate and 2-[¹⁸F]fluoroethyl carbamate, Recommanded Product: Tetrabutylammonium hydrogencarbonate, the publication is Bioorganic & Medicinal Chemistry Letters (2016), 26(2), 584-588, database is CAplus and MEDLINE.

Two 4-nitrobenzyl derivatives, 2-fluoroethyl 4-nitrobenzyl carbonate 1 and 4-nitrobenzyl N-2-fluoroethyl carbamate 2, were radiolabeled with ¹⁸F and evaluated for imaging tumor hypoxia with positron emission tomog. Although good tumor uptake was observed for [¹⁸F]1 and [¹⁸F]2 (>2.5%ID/g at 3-h post-injection), the tracers cleared slowly from nontarget tissues (>1.5%ID/g) and exhibited extensive defluorination in vivo (>4.0%ID/g for bone). Therefore, [¹⁸F]1 and [¹⁸F]2 are not suitable for imaging tumor hypoxia due to suboptimal tumor-to-background contrasts.

Bioorganic & Medicinal Chemistry Letters published new progress about 17351-62-1. 17351-62-1 belongs to catalysis-chemistry, auxiliary class Salt,Amine, name is Tetrabutylammonium hydrogencarbonate, and the molecular formula is C18H23N3O4S, Recommanded Product: Tetrabutylammonium hydrogencarbonate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ting, Seng Yeat published the artcileLong-chain polyunsaturated fatty acid biosynthesis in a land-crab with advanced terrestrial adaptations: Molecular cloning and functional characterization of two fatty acyl elongases, Name: Docosahexaenoic Acid, the publication is Comparative Biochemistry and Physiology, Part B: Biochemistry & Molecular Biology (2022), 110773, database is CAplus and MEDLINE.

Depending on the presence and activities of the front-end fatty acyl desaturases and elongation of very long-chain fatty acid (Elovl) enzymes, animals have different capacities for long-chain (¡ÝC₂₀) polyunsaturated fatty acids (LC-PUFA) biosynthesis. Successful land colonisation in brachyuran crabs requires a shift towards terrestrial food chain with limited LC-PUFA availability. We cloned and functionally characterised two elovl genes from the purple land crab Gecarcoidea lalandii. The two Elovl contained all the necessary motifs of a typical polyunsaturated fatty acids (PUFA) Elovl and phylogenetically clustered in the Elovl1 and Elovl6 clades, resp. The G. lalandii Elovl1 elongated saturated fatty acids, with low activities towards C20 and C22 PUFA substrates. Moreover, the G. lalandii Elovl6 was particularly active in the elongation of C18 PUFA, although it also recognized monounsaturated fatty acids as substrates for elongation. Collectively, the herein characterised G. lalandii elovl paralogues fulfil all the elongation steps involved in the LC-PUFA biosynthetic pathways. Tissue distribution of the G. lalandii elovl genes, along with the FA composition analyses, suggest the hepatopancreas and gill as key metabolic sites for fatty acid elongation. However, current data suggest that G. lalandii is unable to rely solely on biosynthesis to fulfil LC-PUFA requirements, since front-end desaturase appears to be absent in this species and other decapods.

Comparative Biochemistry and Physiology, Part B: Biochemistry & Molecular Biology published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C2H8Cl2N4S2, Name: Docosahexaenoic Acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Chae, Weon-Sik published the artcileMolecular sensing efficiency of gold-silver alloy nanowires, Computed Properties of 10510-54-0, the publication is Bulletin of the Korean Chemical Society (2011), 32(4), 1346-1348, database is CAplus.

The SERS efficiency for the AuAg alloy nanowires was estimated The nanowire were prepared by electrodeposition using anodic aluminum oxide hard templates. The estimated SERS efficiency for the alloy nanowires was comparable to the porous Au nanowires, and both the nanowires showed definitely higher mol. sensing activity than the dense Au nanowires. This result means that 1D AuAg alloy nanomaterials would be excellent SERS substrates.

Bulletin of the Korean Chemical Society published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, Computed Properties of 10510-54-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kim, Dahham published the artcileTwo-Photon and Multicolor Fluorogenic Bioorthogonal Probes Based on Tetrazine-Conjugated Naphthalene Fluorophores, HPLC of Formula: 1466420-02-9, the publication is Bioconjugate Chemistry (2020), 31(5), 1545-1550, database is CAplus and MEDLINE.

Herein, we report the use of two-photon fluorogenic probes using tetrazine-based bioorthogonal reactions with multicolor emissions that cover nearly all of the visible region. New fluorogenic probes were designed based on donor-acceptor-type naphthalene structures conjugated with a fluorescence-quenching tetrazine moiety for turn-on properties in one- and two-photon fluorescence. Our fluorescent probes showed a moderate to good turn-on ratio after bioorthogonal inverse electron demand Diels-Alder cycloaddition with trans-cyclooctenol in one- and two-photon fluorescence. We successfully applied our probes to mitochondria- and lysosome-selective bioorthogonal imaging in live cells with one-/two-photon and one-photon microscopy, resp.

Bioconjugate Chemistry published new progress about 1466420-02-9. 1466420-02-9 belongs to catalysis-chemistry, auxiliary class Copper-Free Click Chemistry,Tetrazine, name is (4-(6-Methyl-1,2,4,5-tetrazin-3-yl)phenyl)methanamine trifluoroacetic acid, and the molecular formula is C12H12F3N5O2, HPLC of Formula: 1466420-02-9.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Campisi, Dario published the artcileAdsorption of Polycyclic Aromatic Hydrocarbons and C₆₀ onto Forsterite: C-H Bond Activation by the Schottky Vacancy, Application In Synthesis of 191-07-1, the publication is ACS Earth and Space Chemistry (2022), 6(8), 2009-2023, database is CAplus.

Understanding how to catalytically break the C-H bond of aromatic mols., such as polycyclic aromatic hydrocarbons (PAHs), is currently a big challenge and a subject of study in catalysis, astrochem., and planetary science. In the latter, the study of the breakdown reaction of PAHs on mineral surfaces is important to understand if PAHs are linked to prebiotic mols. in regions of star and planet formation. In this work, we employed a periodic d. functional theory along with Grimme’s D4 (DFT-D4) approach for studying the adsorption of a sample of PAHs (naphthalene, anthracene, fluoranthene, pyrene, coronene, and benzocoronene) and fullerene on the [010] forsterite surface and its defective surfaces (Fe-doped and Ni-doped surfaces and a MgO-Schottky vacancy) for their implications in catalysis and astrochem. On the basis of structural and binding energy anal., large PAHs and fullerene present stronger adsorption on the pristine, Fe-doped, and Ni-doped forsterite surfaces than small PAHs. On a MgO-Schottky vacancy, parallel adsorption of the PAH leads to the chemisorption process (C-Si and/or C-O bonds), whereas perpendicular orientation of the PAH leads to the catalytic breaking of the aromatic C-H bond via a barrierless reaction. Spin d. and charge anal. show that C-H dissociation is promoted by electron donation from the vacancy to the PAH. As a result of the undercoordinated Si and O atoms, the vacancy acts as a Frustrated Lewis Pair (FLP) catalyst. Therefore, a MgO-Schottky vacancy [010] forsterite surface proved to have potential catalytic activity for the activation of C-H bond in aromatic mols.

ACS Earth and Space Chemistry published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, Application In Synthesis of 191-07-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia