Tag: 100-200

Krell, Katja; Achim-Wagenknecht, Hans published an article in 2020, the title of the article was Fluorogenic and bioorthogonal modification of RNA using photoclick chemistry.Computed Properties of 4433-40-3 And the article contains the following content:

A bromoaryltetrazole-modified uridine was synthesized as new RNA building block for bioorthogonal, light-activated and postsynthetic modification with com. available fluorescent dyes. It allows “photoclick”-type modifications by irradiation with light (300 nm LED) at internal and terminal positions of presynthesized RNA with maleimide-conjugated fluorophores in good yields. The reaction was evidenced for three different dyes. During irradiation, the emission increases due to the formation of an intrinsically fluorescent pyrazoline moiety as photoclick product. The fluorogenecity of the photoclick reaction was significantly enhanced by energy transfer between the pyrazoline as the reaction product (poor emitter) and the photoclicked dye as the strong emitter. The RNA-dye conjugates show remarkable fluorescent properties, in particular an up to 9.4 fold increase of fluorescence, which are important for chem. biol. and fluorescent imaging of RNA in cells. The experimental process involved the reaction of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione(cas: 4433-40-3).Computed Properties of 4433-40-3

The Article related to phosphoramidite tetrazole rna fluorescent bioorthogonal photoclick chem, oligonucleotide, photochemistry, tetrazole, Placeholder for records without volume info and other aspects.Computed Properties of 4433-40-3

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On October 31, 2019, Rus, Lucia Maria; Donici, Elena; Valica, Vladimir; Prisacari, Viorel; Tomuta, Ioan; Sepeli, Diana; Heghes, Simona Codruta; Iuga, Cristina Adela; Uncu, Livia published an article.Safety of 6-Methylpyrimidine-2,4(1H,3H)-dione The title of the article was Development, physical-chemical characterization and in vitro antibacterial activity evaluation of a fixed-dose combination isohydrafural-methyluracil hydrophilic ointment. And the article contained the following:

This research was focused on the pharmaceutical development of a novel, fixed-dose combination isohydrafural-methyluracil ointment on a water soluble base – polyethylene glycol (PEG). Differential scanning calorimetry (DSC) and Fourier transform infra-red spectroscopy (FTIR) were applied in order to determine the compatibility between active pharmaceutical ingredients (APIs) and between APIs – excipients. Nine formulations (F1 – F9) were tested for: phys. appearance and homogeneity, pH, viscosity and osmotic activity. The optimal formulation presented the concentrations of PEG 400 – 76.72%, PEG 1500 – 19.18% and a fixed-dose combination of 0.1% isohydrafural and 4% methyluracil. It showed higher antibacterial properties both to Gram-pos. and Gram-neg. bacteria than nitrofural 2% ointment (Furacilin, Belarus). The long-term stability testing of the optimized formulation of isohydrafural and methyluracil revealed the shelf-life of two years. The experimental process involved the reaction of 6-Methylpyrimidine-2,4(1H,3H)-dione(cas: 626-48-2).Safety of 6-Methylpyrimidine-2,4(1H,3H)-dione

The Article related to staphylococcus enterococcus escherichia klebsiella pseudomonas proteus isohydrafural methyluracil antibacterial, Placeholder for records without volume info and other aspects.Safety of 6-Methylpyrimidine-2,4(1H,3H)-dione

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On August 20, 2021, Peach, Jesse T.; Wilson, Stephanie M.; Gunderson, Logan D.; Frothingham, Lizzi; Tran, Tan; Walk, Seth T.; Yeoman, Carl J.; Bothner, Brian; Miles, Mary P. published an article.HPLC of Formula: 4433-40-3 The title of the article was Temporal metabolic response yields a dynamic biosignature of inflammation. And the article contained the following:

Chronic low-grade inflammation is a subclin. condition directly and indirectly linked to the development of a wide range of diseases responsible for the vast majority of morbidity. To examine mechanisms coupled to chronic disease, a group of overweight and obese human subjects without known inflammatory diseases participated in a high-fat meal challenge as an acute inflammation stimulus. Anal. of serum metabolites grouped by baseline cytokine levels revealed that single samples had little power in differentiating groups. However, an anal. that incorporated temporal response separated inflammatory response phenotypes and allowed us to create a metabolic signature of inflammation which revealed metabolic components that are crucial to a cytokine-mediated inflammation response. The use of temporal response, rather than a single time point, improved metabolomic prediction of high postprandial inflammation responses and led to the development of a dynamic biosignature as a potential tool for stratifying risk to a wide range of diseases. The experimental process involved the reaction of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione(cas: 4433-40-3).HPLC of Formula: 4433-40-3

The Article related to metabolic response biosignature inflammation, metabolomics, pathophysiology, systems biology, Placeholder for records without volume info and other aspects.HPLC of Formula: 4433-40-3

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On April 13, 2021, Pandey, Renu; Collins, Meghan; Lu, Xiyuan; Sweeney, Shannon R.; Chiou, Jennifer; Lodi, Alessia; Tiziani, Stefano published an article.Reference of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione The title of the article was Novel Strategy for Untargeted Chiral Metabolomics using Liquid Chromatography-High Resolution Tandem Mass Spectrometry. And the article contained the following:

Stereospecific recognition of metabolites plays a significant role in the detection of potential disease biomarkers thereby providing new insights in diagnosis and prognosis. D-Hdroxy/amino acids are recognized as potential biomarkers in several metabolic disorders. Despite continuous advances in metabolomics technologies, the simultaneous measurement of different classes of enantiomeric metabolites in a single anal. run remains challenging. Here, we develop a novel strategy for untargeted chiral metabolomics of hydroxy/amine groups (-OH/-NH2) containing metabolites, including all hydroxy acids (HAs) and amino acids (AAs), by chiral derivatization coupled with liquid chromatog.-high resolution tandem mass spectrometry (LC-HR-MS/MS). Diacetyl-tartaric anhydride (DATAN) was used for the simultaneous derivatization of-OH/-NH2 containing metabolites as well as the resulting diastereomers, and all the derivatized metabolites were resolved in a single anal. run. Data independent MS/MS acquisition (DIA) was applied to pos. identify DATAN-labeled metabolites based on reagent specific diagnostic fragment ions. We discriminated chiral from achiral metabolites based on the reversal of elution order of D and L isomers derivatized with the enantiomeric pair (±) of DATAN in an untargeted manner. Using the developed strategy, a library of 301 standards that consisted of 214 chiral and 87 achiral metabolites were separated and detected in a single anal. run. This approach was then applied to investigate the enantioselective metabolic profile of the bone marrow (BM) and peripheral blood (PB) plasma samples from patients with acute myeloid leukemia (AML) at diagnosis and following completion of the induction phase of chemotherapeutic treatment. The sensitivity and selectivity of the developed method enabled the detection of trace levels of the D-enantiomer of HAs and AAs in primary plasma patient samples. Several of these metabolites were significantly altered in response to chemotherapy. The developed LC-HR-MS method entails a valuable step forward in chiral metabolomics. The experimental process involved the reaction of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione(cas: 4433-40-3).Reference of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione

The Article related to untargeted chiral metabolomics liquid chromatog high resolution mass spectrometry, tandem, Placeholder for records without volume info and other aspects.Reference of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Lu, Chen; Gutierrez-Bayona, Natalia Eugenia; Taylor, John-Stephen published an article in 2021, the title of the article was The effect of flanking bases on direct and triplet sensitized cyclobutane pyrimidine dimer formation in DNA depends on the dipyrimidine, wavelength and the photosensitizer.Application of 65-71-4 And the article contains the following content:

Cyclobutane pyrimidine dimers (CPDs) are the major products of DNA produced by direct absorption of UV light, and result in C to T mutations linked to human skin cancers. Most recently a new pathway to CPDs in melanocytes has been discovered that has been proposed to arise from a chemisensitized pathway involving a triplet sensitizer that increases mutagenesis by increasing the percentage of C-containing CPDs. To investigate how triplet sensitization may differ from direct UV irradiation, CPD formation was quantified in a 129-mer DNA designed to contain all 64 possible NYYN sequences. CPD formation with UVB light varied about 2-fold between dipyrimidines and 12-fold with flanking sequence and was most frequent at YYYR and least frequent for GYYN sites in accord with a charge transfer quenching mechanism. In contrast, photosensitized CPD formation greatly favored TT over C-containing sites, more so for norfloxacin (NFX) than acetone, in accord with their differing triplet energies. While the sequence dependence for photosensitized TT CPD formation was similar to UVB light, there were significant differences, especially between NFX and acetone that could be largely explained by the ability of NFX to intercalate into DNA. The experimental process involved the reaction of 5-Methylpyrimidine-2,4(1H,3H)-dione(cas: 65-71-4).Application of 65-71-4

The Article related to cyclobutane pyrimidine dimer photosensitizer wavelength photosensitization, Placeholder for records without volume info and other aspects.Application of 65-71-4

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On July 31, 2014, Borodkin, G. I.; Elanov, I. R.; Shubin, V. G. published an article.Quality Control of 6-Methylpyrimidine-2,4(1H,3H)-dione The title of the article was Eco-friendly fluorination of 6-methyl- and 1,3,6-trimethyluracils in water. And the article contained the following:

We examined the reaction of 6-methyl- and 1,3,6-trimethyluracils with F-TEDA-BF4, 4-chloromethyl-1-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate), in water. The experimental process involved the reaction of 6-Methylpyrimidine-2,4(1H,3H)-dione(cas: 626-48-2).Quality Control of 6-Methylpyrimidine-2,4(1H,3H)-dione

The Article related to fluorination uracil green chem water, General Organic Chemistry: Synthetic Methods and other aspects.Quality Control of 6-Methylpyrimidine-2,4(1H,3H)-dione

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On May 13, 2021, Park, Woojin; Lee, Seunghoon; Huix-rotllant, Miquel; Filatov, Michael; Choi, Cheol ho published an article.Category: pyrimidines The title of the article was Impact of the Dynamic Electron Correlation on the Unusually Long Excited-State Lifetime of Thymine. And the article contained the following:

Non-radiative relaxation of the photoexcited thymine in the gas phase shows an unusually long excited-state lifetime, and, over the years, a number of models, i.e., S1-trapping, S2-trapping, and S1&S2-trapping, have been put forward to explain its mechanism. Here, we investigate this mechanism using non-adiabatic mol. dynamics (NAMD) simulations in connection with the recently developed mixed-reference spin-flip time-dependent d. functional theory (MRSF-TDDFT) method. We show that the previously predicted S2-trapping model was due to an artifact caused by an insufficient account of the dynamic electron correlation. The current work supports the S1-trapping mechanism with two lifetimes, τ1 = 30 ± 1 fs and τ2 = 6.1 ± 0.035 ps, quant. consistent with the recent time-resolved experiments Upon excitation to the S2 (ππ*) state, thymine undergoes an ultrafast (ca. 30 fs) S2→S1 internal conversion and resides around the min. on the S1 (nOπ*) surface, slowly decaying to the ground state (ca. 6.1 ps). While the S2→S1 internal conversion is mediated by fast bond length alternation distortion, the subsequent S1→S0 occurs through several conical intersections, involving a slow puckering motion. The experimental process involved the reaction of 5-Methylpyrimidine-2,4(1H,3H)-dione(cas: 65-71-4).Category: pyrimidines

The Article related to impact dynamic electron correlation long excited state lifetime thymine, General Physical Chemistry: General Theories and other aspects.Category: pyrimidines

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On October 14, 2021, Pomogaev, Vladimir; Lee, Seunghoon; Shaik, Sason; Filatov, Michael; Choi, Cheol Ho published an article.Electric Literature of 65-71-4 The title of the article was Exploring Dyson’s Orbitals and Their Electron Binding Energies for Conceptualizing Excited States from Response Methodology. And the article contained the following:

The MO concept is a useful tool, which relates the mol. ground-state energy with the energies (and occupations) of the individual orbitals. However, anal. of the excited states from linear response computations is performed in terms of the initial state MOs or some other forms of orbitals, e.g., natural or natural transition orbitals. Because these orbitals lack the resp. energies, they do not allow developing a consistent orbital picture of the excited states. Herein, we argue that Dyson’s orbitals enable description of the response states compatible with the concepts of MO theory. The Dyson orbitals and their energies obtained by mixed-reference spin-flip time-dependent d. functional theory (MRSF-TDDFT) for the response ground state are remarkably similar to the canonical MOs obtained by the usual DFT calculation For excited states, the Dyson orbitals provide a chem. sensible picture of the electronic transitions, thus bridging the chasm between orbital theory and response computations. The experimental process involved the reaction of 5-Methylpyrimidine-2,4(1H,3H)-dione(cas: 65-71-4).Electric Literature of 65-71-4

The Article related to dyson orbital electron binding energy excited state response methodol, General Physical Chemistry: General Theories and other aspects.Electric Literature of 65-71-4

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On January 20, 2017, He, Chun-Yang; Kong, Jingjing; Li, Xuefei; Li, Xiaofei; Yao, Qiuli; Yuan, Fu-Ming published an article.COA of Formula: C5H6N2O2 The title of the article was Visible-Light-Induced Direct Difluoroalkylation of Uracils, Pyridinones, and Coumarins. And the article contained the following:

An efficient and general method for the synthesis of difluoroalkylated uracils, pyridinones, and coumarins through visible-light-induced reaction with com. materials is developed. The strategy proceeds with high efficiency under mild reaction conditions and shows excellent functional group compatibility, even toward bromide and hydroxyl group, thus demonstrates high potent application in a late-stage fluoroalkylation. Moreover, the difluoroalkylated products can be further transformed to a diverse variety of difluoroalkylated heterocycles, including mols. of potential biol. activity. The experimental process involved the reaction of 6-Methylpyrimidine-2,4(1H,3H)-dione(cas: 626-48-2).COA of Formula: C5H6N2O2

The Article related to photochem fluoroalkylation uracil pyridinone coumarin visible light, General Organic Chemistry: Synthetic Methods and other aspects.COA of Formula: C5H6N2O2

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Nam, Jaehyuk; Jung, Yongseok; Jang, Woo-Dong published an article in 2017, the title of the article was Uracil-bearing poly(2-isopropyl-2-oxazoline): Hg(II)-selective control of its thermoresponsiveness.Related Products of 4433-40-3 And the article contains the following content:

A poly(2-isopropyl-2-oxazoline)-containing mercury ion (Hg2+)-responsive uracil moiety (U-PiPOx-U) was synthesized and it exhibited thermoresponsiveness in its aqueous solution The changes in the UV-visible absorption and thermoresponsiveness of U-PiPOx-U upon the addition of Hg2+ were studied. Selective sensing of Hg2+ was also studied. The experimental process involved the reaction of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione(cas: 4433-40-3).Related Products of 4433-40-3

The Article related to uracil bearing polyisopropyloxazoline mercury selective thermoresponsiveness control, Inorganic Analytical Chemistry: Determinations and other aspects.Related Products of 4433-40-3

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia