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Methyl - Springer Nature

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Last Updated: 20 April 2022

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Determination of monomer reactivity ratios from a single sample using multivariate analysis of the ^1H NMR spectra of poly[(methyl methacrylate)-co-(benzyl methacrylate)]

methyl methacrylate and benzyl methacrylate copolymerization in toluene at 70°C was prepared by conventional radical copolymerization. The signals of the methoxy protons in the MMA units and the benzyl protons in the BnMA units were splitting principally due to the triad monomer sequences when the temperature was raised to 150°C in deuterated dimethyl sulfoxide. Partial least-squares regression model correctly predicted the mole fractions of the diad monomer sequences. The monomer reactivity ratios were calculated using PLS regression in unknown sample prepared in benzene at 60 °C, Then, the fractions of the diad sequences in unknown sample prepared in benzene at 60 °C were predicted using PLS regression to determine the monomer reactivity ratios. Detailed information about the chemical composition and the monomer sequence of methyl methacrylate and benzyl methacrylate was obtained by multivariate analysis of 1H NMR spectra of methyl methacrylate and benzyl methacrylate copolymers of methyl methacrylate and benzyl methacrylate by a multivariate analysis of methyl methacrylate and benzyl methacrylate copoly The monomer reactivity ratios were expected to be determined by Then, the fractions of diad monomer sequences in unknown sample.

Source link: https://doi.org/10.1038/s41428-022-00618-y


Novel Schiff base (E)-2-((4-chloro-3-nitrophenylimino)(phenyl)methyl)-5-methoxyphenol and Mixed Ligand Complexes of Mn(II), Fe(III), Co(II), Ni(II) and Cu(II): synthesis, structure elucidation and potency study as antibacterial, antimalarial, antioxidant, antidibetic and anticancer agents

Abstract Novel Schiff Base -2--5-methoxyphenol synthesized by condensing 2-hydroxy-4-methoxy benzophenone and 4-chloro-3-nitroaniline in ethanol and used for the creation of five new mixed ligand complexes of Mn Fe, Co, Ni, and Cu.

Source link: https://doi.org/10.1007/s13738-021-02431-5


Gold Leaching from Copper Anode Slime with 1-Butly-3-Methyl Imidazolium Chloride

The results revealed that 61. 2 percent of gold leaching efficiency was obtained from CAS, under the ideal leaching conditions that were determined as %80 ionic liquid percentage, 50°C temperature, 1 h time, and 1/20 g/mL solid/liquid ratio, according to the results: 61. 2 percent gold leaching ratio, 60 percent ionic liquid content, 61. 20% solid/liquid ratio, 61. 20%. Time > time > solid/liquid ratio > ionic liquid concentration The experimental findings revealed that the effects of each parameter on BmimCl's gold leaching were in the following order: temperature > time > ionic liquid ratio > ionic liquid concentration.

Source link: https://doi.org/10.1007/s11837-022-05249-5


Solubilization of poly(styrene)(PS)-b-poly(methyl methacrylate)(PMMA)-b-PS in poly(n-nonyl acrylate) and PMMA monolayers as isolated chains with both PS blocks forming separated single-block particles

The end-to-end distance was not determined using the PS single-block particles at either end, but the PMMA block chain was not found to be tightly divided in either the PNA and PMMA monolayers, but it was rather long and interpenetrated with the matrix chains. Previously, we disdiluted PS-B-PMMA from a dilute solution to prevent intermolecular aggregation and discovered that a single PS block aggregated to form a single PS single-block particle from which a PMMA monolayer emerged. We investigated whether PS-b -PMMA-PS could be used to produce PS single-block particles at both ends without aggregation of the PS blocks. The PMMA block chain was not particularly separated in the PMMA monolayer but rather elongated and interpenetrated with the matrix chains, according to our researchers.

Source link: https://doi.org/10.1038/s41428-022-00614-2


Increase in rosmarinic acid accumulation and transcriptional responses of synthetic genes in hairy root cultures of Prunella vulgaris induced by methyl jasmonate

In the hairy roots of Prunella vulgaris, the optimum induction efficiencies in the production of rosmarinic acid, total flavonoids, and total phenolics was demonstrated by 100 %M. To determine whether methyl jasmonate is related to a signal transduction pathway that resulted in the elucidation of rosmarinic acid synthesis in Prunella vulgaris, we treated the hairy roots with MeJA and determined the presence of RA, total phenolics, and total flavonoids. Therefore, the time course assessment of hairy root culture with 100 M MeJA was conducted to determine the exposure results over eight days. We checked the expression of gene transcripts associated with the RA synthetic pathway as well. The results of our study show that MeJA can be used as an effective elucidation for the future growth of hairy root cultures of P. vulgaris for the yield of RA in a bioreactor system.

Source link: https://doi.org/10.1007/s11240-022-02273-w


The use of the low-temperature sol–gel method for ZnO-TiO_2 nanorods synthesis: structural analysis, morphology and photodegradation properties of methyl orange dye with benzoquinone scavenger

Zin oxide's photocatalytic activity can be enhanced by co-doping it with titanium oxide by a sol-gel process. The ZnO-TiO_2 composite was successfully fabricated via the sol-gel technique at 400 °C, yielding the hexagonal ZnO phase and the TiO_2 anatase phase, according to the X-ray diffraction results. The photodegradation capacity was tested against methyl orange dye on the surface of textile cotton with a photon source, namely ultraviolet light with wavelength 385 nm at intervals of 0–240 min. During the process, the optimum rate of MO dye photodegradation was determined by a combination of the hydroxyl radicals and anionic superoxide radicals published by ZnO-TiO_2. Reactive species in the photodegradation process was determined based on the scavenger capture of radicals, photo-induction holes, and remnants of p-benzoquinone compounds with a concentration of 2 ppm and 5 ppm.

Source link: https://doi.org/10.1007/s13738-021-02439-x


Bottleneck removal of paclitaxel biosynthetic pathway by overexpression of DBTNBT gene under methyl-β-cyclodextrin and coronatine elicitation in Taxus baccata L.

DBTNBT overexpression as a result of CD and COR elicitation lead to the much faster growth of the upstream bottleneck genes such as DBAT and BAPT. Paclitaxel, a graphically based diterpenoid, is widely used for the treatment of several cancer types. Several elicitors have been used to solve several problems due to the limited production of paclitaxel in Taxus cell cultures. The complete length of the DBTNBT code sequence, as one of the pactaxel pathway bottlenecks, was integrated downstream of the CaMV 35S promoter and transiently expressed in Taxus baccata leaves by Agrobacterium tumefaciens and vacuum infiltration techniques. Bottleneck removal appears to be used on a large scale in Taxus metabolic engineering, resulting in the relative elimination of several bottlenecks and an increase in final paclitaxel production in the near future.

Source link: https://doi.org/10.1007/s11240-022-02279-4


Stimulation of phenolic compounds accumulation and antioxidant activity in in vitro culture of Salvia tebesana Bunge in response to nano-TiO_2 and methyl jasmonate elicitors

BAP enhancement, rosmarinic acid, and some individual flavonoids, as well as the antioxidant capacity of callus were discovered on MS media containing different amounts of BAP, tebesana. Although no positive correlation was found between antioxidant assays and treated calli's phenolic derivatives of treated calli, a strong correlation existed between antioxidant assays and treated calli's phenolic derivatives; a strong correlation was established between the amount of rosmarinic acid of apical meristem-derived calli and DPPH and FRAP values, which showed a high correlation. In S. tebesana, the combination of in vitro culture and elicitation was a promising strategy to efficiently produce and improve the content of pharmacologically valuable metabolites.

Source link: https://doi.org/10.1007/s11240-022-02251-2


Rotational Coupling in Methyl-Tunneling Electron Spin Echo Envelope Modulation

If hyperfine coupling of a nearby electron spin to the methyl protons in stimulated and spin-locked echo experiments, coherence between tunnel-split states of a methyl quantum rotor can be established and observed in stimulated and spin-locked echo experiments can be established and observed in stimulated and spin-locked echo experiments, if hyperfine coupling of a nearby electron spin to the methyl protons breaks C symmetry and is of the same order of magnitude as tunnel separation of chromatic synthesis of a methyl protons breaks C M chromat spin-locked echo experiments is observed in a echoed chromatic spin-locked echo experiments can be produced and observed in stimulated and observed in stimulated and observed in stimulated and observed in stimulated and observed in stimulated and observed in chromatic beam chromatic synthesis of chromatic beam chromatic order of chromatic chromat spin-locked echo experiments We find that, in a world where the ratio between rotor-rotor coupling and rotational barrier is much smaller than unity, three-pulse ESEEM and hyperfine-decoupled ESEEM depend only on tunnel splitting, but not on this ratio.

Source link: https://doi.org/10.1007/s00723-021-01375-6


Thermal Degradation of Poly (Styrene-Co-Methyl Methacrylate) in the Presence of AlI_3 Nanoadditive

The thermal behavior of PSCMMA was investigated in the presence of different concentrations of AlI_3 NA. Composites of AlI_3 NA were manufactured in an acetone common solvent by varying the amount of AlI_3 NA from 0 to 5% by weight. Pure PSCMMA1 burns 5 times faster than PSCMMA6 nanocomposites, with Pure PSCMMA1 burning 5 times faster than PSCMMA6 nanocomposites.

Source link: https://doi.org/10.1007/s11837-022-05154-x

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions