• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 30
  • 8
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 52
  • 11
  • 10
  • 8
  • 6
  • 5
  • 5
  • 5
  • 5
  • 4
  • 4
  • 4
  • 4
  • 4
  • 4
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Исследование антиоксидантных свойств препаратов сочетанного действия : магистерская диссертация / Study of antioxidant properties of combined action

Борисова, М. В., Borisova, M. V. January 2021 (has links)
Целью выпускной квалификационной работы является комплексное исследование интегральных антиоксидантных параметров препаратов комбинированного действия для терапии вирусных и нейродегенеративных заболеваний. Были изучены пути образования свободных радикалов, рассмотрены антиоксидантные подходы в терапии различных заболеваний. С использованием предложенных потенциометрических методов была исследована антиоксидантная (АОЕ) и антирадикальная (АРЕ) емкость синтезированных триазолов и имидазолов, модифицированных полифенолами. АОЕ определяли потенциометрическим методом с использованием окислителя нерадикальной природы – K3[Fe(CN)6]/K4[Fe(CN)6], АРЕ оценивали потенциометрическим методом с использованием радикал-генерирующей системы 2,2´-азобис(2-метилпропионамидин) дигидрохлорида (ААРН). Стехиометрические коэффициенты ингибирования изученных триазолов принимают значения от 0 до 15, имидазолов от 0 до 5 в зависимости от количества активных групп в молекуле антиоксиданта, их расположением и с механизмом обрыва цепей на антиоксиданте. Были проведены корреляционные исследования с применением независимых спектрофотометрических методов. / Objective of the work: comprehensive study of integral antioxidant parameters of combined action drugs for the treatment of viral and neurodegenerative diseases. We have considered ways to form free radicals and antioxidant approaches in therapy of various diseases. In the process of work we investigated the antioxidant parameters adducts of triazole and imidazoles modified with polyphenols. Particularly, the determination of antioxidant capacity with oxidizing agents of a radical (2,2'-azobis (2-methylpropionamidine) dihydrochloride (AAPH)) and non-radical nature (K3[Fe(CN)6]/K4[Fe(CN)6) was performed by using the potentiometric method. Stoichiometric inhibition coefficients of the studied triazoles take values from 0 to 15, imidazoles – from 0 to 5, depending on the number of active groups in the antioxidant molecule, their location and the mechanism of chain termination on the antioxidant. Spectrophotometric studies were carried out using the reactions of the interaction of antioxidants with a stable radical 2,2-diphenyl-1-picrylhydrazyl (DPPH•) and reagent Folin-Ciocalteu to confirm the correctness of the results.
52

Relaxation of Isolated Human Myometrial Muscle by beta2-Adrenergic Receptors but Not beta1-Adrenergic Receptors

Liu, Ying L., Nwosu, Uchenna C., Rice, P. J. 01 October 1998 (has links)
OBJECTIVE: Human myometrium contains both beta1-adrenergic and beta2-adrenergic receptors. This study was designed to assess the importance of each beta-adrenergic receptor subtype in relaxation of human myometrial muscle strips. STUDY DESIGN: Radioligand binding studies were used to establish the presence of each beta-adrenergic receptor subtype, whereas highly selective beta1-antagonists and beta2-antagonists were used to assess the contribution of beta-adrenergic receptor subtypes to myometrial relaxation after exposure to (-)-isoproterenol. RESULTS: Membranes prepared from myometrium contained 82% +/- 4% beta2-adrenergic receptors. After contraction produced by exposure to potassium chloride (35 mmol/L), isoproterenol produced relaxation with half maximal effect at 0.02 micromol/L and a maximal relaxation of 52% +/- 3%. Beta1-antagonist CGP-20712A had no significant effect, whereas beta2-antagonist ICI-118551 produced a characteristic rightward shift of the isoproterenol concentration-relaxation relationship. CONCLUSIONS: Although both beta1-adrenergic receptors and beta2-adrenergic receptors are present in human myometrial tissue at term, relaxation by nonselective beta-agonist isoproterenol is mediated exclusively by beta2-adrenergic receptors.

Page generated in 0.0312 seconds