l tryptophan/עששת

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Cavity ring-down laser absorption spectroscopy of jet-cooled L-tryptophan.

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התחבר הרשם

The jet-cooled ultraviolet direct absorption spectrum of the amino acid tryptophan is reported. The spectrum measured by cavity ring-down laser absorption spectroscopy covers the region where the origin bands of the S(1) <-- S(0) transitions of six conformers (A to F) are located. Tryptophan was

Carbonic anhydrase activators: kinetic and X-ray crystallographic study for the interaction of D- and L-tryptophan with the mammalian isoforms I-XIV.

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התחבר הרשם

An activation study of mammalian carbonic anhydrase (CA, EC 4.2.1.1) isoforms I-XIV with D- and L-tryptophan has been performed both by means of kinetic and X-ray crystallographic techniques. These compounds show a time dependent activity against isozyme CA II, with activation constants of 1.13

Preparation of L-tryptophan imprinted microspheres based on carboxylic acid functionalized polystyrene.

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התחבר הרשם

In this work, polymerizable (4-vinylbenzoyl)-L-tryptophan (VBLT) was synthesized and characterized utilizing, elemental analysis, mass spectra, FTIR, (1)H and (13)CNMR. VBLT was then copolymerized with styrene and divinylbenzene cross-linker using potassium persulfate free radical initiator. The

Dansylation of human serum albumin in the study of the primary binding sites of bilirubin and L-tryptophan.

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התחבר הרשם

Binding of bilirubin and of L-tryptophan to dansylated albumins was investigated. Dansylation of less than one lysine residue per molecule of albumin did not affect the bilirubin binding, but decreased the L-tryptophan binding, indicating that dansylation had taken place in or near the

Sites of serotonin uptake in epithelia of the developing mouse palate, oral cavity, and face: possible role in morphogenesis.

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התחבר הרשם

With the method of whole mouse embryo culture, together with immunocytochemistry with an antiserum to serotonin (5-HT), sites of 5-HT uptake were found to be transiently expressed in the epithelia of the developing palate, tongue, nasal septum, and maxillary and mandibular prominences during the

Tryptophan PET-defined gross tumor volume offers better coverage of initial progression than standard MRI-based planning in glioblastoma patients.

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התחבר הרשם

OBJECTIVE Glioblastoma is an infiltrative malignancy that tends to extend beyond the MRI-defined tumor volume. We utilized positron emission tomography (PET) imaging with the radiotracer alpha-[11C]methyl-L -tryptophan (AMT) to develop a reliable high-risk gross tumor volume (HR-GTV) method for

Molecular docking of bacosides with tryptophan hydroxylase: a model to understand the bacosides mechanism.

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התחבר הרשם

Tryptophan hydroxylase (TPH) catalyses l-tryptophan into 5-hydroxy-l-tryptophan, which is the first and rate-limiting step of serotonin (5-HT) biosynthesis. Earlier, we found that TPH2 up-regulated in the hippocampus of postnatal rats after the oral treatment of Bacopa monniera leaf extract

Indole-3-acetic acid (IAA) production by Arthrobacter species isolated from Azolla.

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התחבר הרשם

Arthrobacter species, isolated from the leaf cavities and the microsporocarps of the aquatic fern species Azolla pinnata and Azolla filiculoides, produced indole-3-acetic acid (IAA) in culture when the precursor tryptophan was added to the medium. No IAA production was detected in the absence of

Microfluidic discharge-based optical sources for detection of biochemicals.

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התחבר הרשם

This paper reports a discharge-based optical source for fluorescence of biochemicals in microfluidic systems. Its efficacy is demonstrated using a stacked microchip that integrates a microfluidic wavelength-tunable optical source, a biochemical sample reservoir and optical filters. It is shown to

Regulatory features of the trp operon and the crystal structure of the trp RNA-binding attenuation protein from Bacillus stearothermophilus.

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התחבר הרשם

Characterization of both the cis and trans -acting regulatory elements indicates that the Bacillus stearothermophilustrp operon is regulated by an attenuation mechanism similar to that which controls the trp operon in Bacillus subtilis. Secondary structure predictions indicate that the leader region

Structural Basis for β-Carboline Alkaloid Production by the Microbial Homodimeric Enzyme McbB.

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התחבר הרשם

The β-carboline (βC) alkaloids occur throughout nature and exhibit diverse biological activities. In contrast to βC alkaloid synthesis in plants, the biosynthesis in microorganisms remains poorly understood. The recently reported McbB from Marinactinospora thermotolerans is a novel enzyme proposed

A norepinephrine coated magnetic molecularly imprinted polymer for simultaneous multiple chiral recognition.

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התחבר הרשם

A newly designed molecularly imprinted polymer (MIP) material was developed and successfully used as recognition element for enantioselective recognition by microchip electrophoresis. In this work, molecularly imprinted polymers were facilely prepared employing Fe3O4 nanoparticles (NPs) as the

Construction and application of a stoichiometric displacement model for retention in chiral recognition of molecular imprinting.

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התחבר הרשם

To do an extensive investigation of the chiral recognition mechanism of the molecular imprinting technique, two kinds of enantio-selective molecularly imprinted polymers (MIPs), N-tert-butoxycarbonyl-L-tryptophan (N-Boc-L-Trp) and N-tert-butoxycarbonyl-L-tyramine (N-Boc-L-Tyr), were synthesized by

Modulation of swimming in the lamprey, Petromyzon marinus, by serotonergic and dopaminergic drugs.

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התחבר הרשם

The effects of serotonergic and dopaminergic drugs on free swimming behavior in adult sea lampreys (Petromyzon marinus) were investigated using video image analysis. Injections of the serotonin precursor 5-hydroxy-L-tryptophan along with the serotonin reuptake blocker clomipramine into the visceral

The orphan G protein-coupled receptor GPR139 is activated by the peptides: Adrenocorticotropic hormone (ACTH), α-, and β-melanocyte stimulating hormone (α-MSH, and β-MSH), and the conserved core motif HFRW.

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התחבר הרשם

GPR139 is an orphan G protein-coupled receptor that is expressed primarily in the brain. Not much is known regarding the function of GPR139. Recently we have shown that GPR139 is activated by the amino acids l-tryptophan and l-phenylalanine (EC50 values of 220 μM and 320 μM, respectively), as well

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