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Formation of a narrow chiral cavity in bis-copper(ii) complexes of ferrocenylmethyl-l-tyrosine and its interaction with achiral guests.

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Earlier we reported the tendency of ferrocenylmethyl substituted amino acids to organize around Cu(ii) in a C(2) symmetry. In this paper we have utilized this property to form a chiral cavity using a l-tyrosine derivative. Structural characterization of [Cu(II)(S-fTyr)(2)(MeCN)(2)] (), where

Serial O-(2-[(18)F]fluoroethyl)-L: -tyrosine PET for monitoring the effects of intracavitary radioimmunotherapy in patients with malignant glioma.

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OBJECTIVE Intracavitary radioimmunotherapy (RIT) offers an effective adjuvant therapeutic approach in patients with malignant gliomas. Since differentiation between recurrence and reactive changes following RIT has a critical impact on patient management, the aim of this study was to analyse the

Treatment-related uptake of O-(2-[18F]fluoroethyl)-L-tyrosine and L-[methyl-3H]-methionine after tumor resection in rat glioma models.

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Purpose: Assessment of residual tumor after resection of cerebral gliomas can be difficult with MRI and may be improved by amino acid PET. The aim of this experimental study was to investigate uptake of (2-[¹⁸F]fluoroethyl)-L-tyrosine (¹⁸F-FET) and

Can Early Postoperative O-(2-18FFluoroethyl)-l-Tyrosine Positron Emission Tomography After Resection of Glioblastoma Predict the Location of Later Tumor Recurrence?

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OBJECTIVE Glioblastoma inevitably recurs despite aggressive therapy. Therefore, it would be helpful to predict the location of tumor recurrence from postoperative imaging to customize further treatment. O-(2-18Ffluoroethyl)-l-tyrosine (FET) positron emission tomography (PET) might be a helpful

Flare phenomenon in O-(2-[18F]-Fluoroethyl)-L-Tyrosine PET after resection of gliomas.

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Purpose: PET using O-(2-[¹⁸F]Fluoroethyl)-L-tyrosine (¹⁸F-FET) is useful to detect residual tumor tissue after glioma resection. Recent animal experiments detected reactive changes of ¹⁸F-FET uptake at the rim of the resection cavity within the first two weeks

Host-guest interaction of L-tyrosine with beta-cyclodextrin.

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The inclusion complexes of beta-cyclodextrin (beta-CD) with L-tyrosine (L-TYN) were investigated by using spectrophotometers. The absorption and fluorescence enhancement occurs with beta-CD and L-TYN forms 1:1 inclusion complex. The unusual blue shift of hydroxyl ion in the beta-CD medium confirms

Value of O-(2-[18F]fluoroethyl)- L-tyrosine PET for the diagnosis of recurrent glioma.

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OBJECTIVE The prognosis of patients with recurrent gliomas depends on reliable and early diagnosis of tumour recurrence after initial therapy. In this context, magnetic resonance imaging (MRI) and computed tomography (CT) often fail to differentiate between radiation- and tumour-induced contrast

Role of the default mode resting-state network for cognitive functioning in malignant glioma patients following multimodal treatment

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Background: Progressive cognitive decline following multimodal neurooncological treatment is a common observation in patients suffering from malignant glioma. Alterations of the default-mode network (DMN) represent a possible source of

Endoscopic management of a low-grade thalamic glioma: a safe alternative to open microsurgery?

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Despite considerable advances in preoperative and intraoperative imaging and neuronavigation, resection of thalamic gliomas remains challenging. Although both endoscopic biopsy and third ventriculostomy (ETV) for the treatment of secondary hydrocephalus are commonly performed, endoscopic resection

Spectroscopic characterization of the inclusion complex of a luteinizing hormone-releasing hormone agonist, buserelin acetate, with dimethyl-beta-cyclodextrin.

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Inclusion complexation of buserelin acetate, and agonist of luteinizing hormone-releasing hormone, with dimethyl-beta-cyclodextrin (DM-beta-CyD) in aqueous solution was studied spectroscopically and its mode of interaction was assessed. Ultraviolet absorption and circular dichroism (CD)

Novel, benign, solid catalysts for the oxidation of hydrocarbons.

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The catalytic properties of two classes of solid catalysts for the oxidation of hydrocarbons in the liquid phase are discussed: (i) microporous solids, encapsulating transition metal complexes in their cavities and (ii) titanosilicate molecular sieves. Copper acetate dimers encapsulated in molecular

Purification and partial characterization of an alpha-chymotrypsin-like protease of rat peritoneal mast cells.

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An alpha-chymotrypsin-like enzyme was isolated from mast cells of the rat peritoneal cavity by extraction with 0.8 M potassium phosphate, 2 per cent protamine sulfate followed by affinity chromatography on hen ovoinhibitor-agarose and adsorption on barium sulfate. This procedure yielded over 9 mg of

Pressure effects on enzyme reactions in mainly organic media: alpha-chymotrypsin in reversed micelles of Aerosol OT in octane.

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Biocatalytic transformations in reversed micelles formed by anionic surfactant Aerosol OT in octane have been studied at high pressures by an example of alpha-chymotrypsin-catalyzed hydrolysis of N-carbobenzoxy-L-tyrosine p-nitrophenyl ester and N-succinyl-L-phenylalanine p-nitroanilide. For the

Mechanism of nasal absorption of drugs. IV: Plasma levels of radioactivity following intranasal administration of [3H]leucine enkephalin.

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To study the factors influencing nasal absorption of a model pentapeptide, plasma levels of total radioactivity were determined following the administration of [3H]tyr-leucine enkephalin to rats intravenously, intranasally alone, and intranasally in the presence of puromycin. The major pathway for

Aminoacyl-coenzyme A synthesis catalyzed by a CoA ligase from Penicillium chrysogenum.

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Coenzyme A ligases play an important role in metabolism by catalyzing the activation of carboxylic acids. In this study we describe the synthesis of aminoacyl-coenzyme As (CoAs) catalyzed by a CoA ligase from Penicillium chrysogenum. The enzyme accepted medium-chain length fatty acids as the best

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