thymine/تسوس سني

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Genetic variation of Helicobacter pylori in the oral cavity and stomach detected using thymine adenine cloning in children with chronic gastritis.

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OBJECTIVE To investigate the DNA sequence variations of Helicobacter pylori in the oral cavities and stomachs of children with chronic gastritis. METHODS Dental plaques and gargle on 235 patients were obtained before gastroscopy. Gastric H. pylori infection was diagnosed using rapid urease test or

Three thymine/adenine binding modes of the ruthenium complex Λ-[Ru(TAP)2(dppz)]2+ to the G-quadruplex forming sequence d(TAGGGTT) shown by X-ray crystallography.

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Λ-[Ru(TAP)2(dppz)]2+ was crystallised with the G-quadruplex-forming heptamer d(TAGGGTT). Surprisingly, even though there are four unique binding sites, the complex is not in contact with any G-quartet surface. Two complexes stabilise cavities formed from terminal T·A and T·T mismatched pairs. A

Thermochemistry of aqueous solutions of alkylated nucleic acid bases. III. Enthalpies of hydration of uracil, thymine and their derivatives.

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Enthalpies of sublimation DeltaH(0)(subl) crystalline uracil, thymine and their methylated derivatives as well as of N,N-diethylthymine were determinated by the quartz-resonator method and mass spectrometry. Enthalpies of solution at infinite dilution DeltaH(0)(sol) in water of aBcylated compounds

The readout of base-pair information in adenine-thymine α-D-Arabinonucleosides.

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Structurally modified nucleosides are central players in the field of nucleic acid chemistry. Adenine-thymine (AT) pyrimido[4,5-d]pyrimidine furanosyl and pyranosyl arabinonucleosides have been synthesized for the first time. Single-crystal X-ray diffraction analysis reveals novel base pairs that,

Supramolecular nanopatterns self-assembled by adenine-thymine quartets at the liquid/solid interface.

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By means of scanning tunneling microscopy (STM), we have observed for the first time well-ordered supramolecular nanopatterns formed by mixing two complementary DNA bases: adenine (A) and thymine (T), respectively, at the liquid/solid interface. By mixing A and T at a specific mixing molar ratio,

Low-energy Auger- and photo-electron effects on the degradation of thymine by ultrasoft X-irradiation.

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OBJECTIVE To investigate quantitatively and qualitatively the production of thymine radicals produced by monochromatic ultrasoft X (USX) or (60)Co gamma-rays using electron paramagnetic resonance (EPR) spectroscopy. METHODS Thymine was chosen as the DNA component for the irradiation. The EPR

Designing of MIP based QCM sensor having thymine recognition sites based on biomimicking DNA approach.

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Quartz crystal microbalance (QCM) sensors coated with molecular imprinted polymers (MIP) have been developed for the determination of thymine. In this method, methacryloylamidoadenine (MA-Ade) have used as a new monomer and thymine template for inspiration of DNA nucleobases interaction. The thymine

The influence of microhydration on the ionization energy thresholds of uracil and thymine.

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In the present study the ionization energy thresholds (IET's) of uracil and thymine have been calculated (with the B3LYP, PMP2, and P3 levels of theory using the standard 6-31++G(d,p) basis set) with one to three water molecules placed in the first hydration shell. Then (B3LYP) polarizable continuum

Interaction of cyclic cytosine-, guanine-, thymine-, uracil- and mixed guanine-cytosine base tetrads with K+, Na+ and Li+ ions -- a density functional study.

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We have carried out B3LYP hybrid density functional studies of complexes formed by cyclic cytosine-, guanine-, thymine-, uracil- and mixed guanine cytosine-tetrads with Li+, Na+ and K+ ions to determine their structures and interaction energies. The conformations studied have been restricted to a

Mechanical tuning of molecular recognition to discriminate the single-methyl-group difference between thymine and uracil.

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Construction of enzyme-like artificial cavities is a complex and challenging subject. Rather than synthesizing complicated host molecules, we have proposed mechanical adaptation of relatively simple hosts within dynamic media to determine the optimum conformation for molecular recognition. Here we

Hemangiomas of the tongue and the oral cavity in a myotonic dystrophy type 1 patient: A case report.

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Myotonic dystrophy type 1 (DM1) is an autosomal dominant disease caused by a cytosine, guanine, thymine (CTG) trinucleotide repeat expansion in the non-coding region of dystrophia myotonica protein kinase gene, causing a multisystem involvement. To date, few studies have been performed

An improved method for the expression and purification of porcine dihydropyrimidine dehydrogenase.

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Dihydropyrimidine dehydrogenase (DPD) catalyzes the reduction of uracil and thymine bases with electrons derived from NADPH. The mammalian DPD enzyme is a functional homodimer and has an elaborate cofactor arrangement. Two flavin cofactors (FAD and FMN) reside in two active site cavities that are

[Synthesis and characterization of model system in biological related function--model compounds for investigation of metal-metal interaction and nucleobase-aromatics interaction].

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Several kinds of compounds available as model systems to investigation on metal-metal interaction in metalloproteins and on interaction of aromatics with nucleobases in arene intercalation to DNA were synthesized and characterized by spectrometry. Double and triple layered porphyrinophanes linked

A cyclodextrin host-guest recognition approach to a label-free electrochemical DNA hybridization biosensor.

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A novel label-free electrochemical DNA hybridization biosensor using a β-cyclodextrin/poly(N-acetylaniline)/carbon nanotube composite modified screen printed electrode (CD/PNAANI/CNT/SPE) has been developed. The proposed DNA hybridization biosensor relies on the intrinsic oxidation signals of

Tests of spool models for DNA packaging in phage lambda.

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Experiments are reported which bear on two spool models proposed for packaging the DNA of phage lambda. Both spool models fill an assumed spherical cavity with DNA wrapped in cylindrical or quasi-cylindrical layers composed of adjacent circular turns. In the curved-spool model, a single continuous

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