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  • 1
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1271-1276 
    ISSN: 0392-6737
    Keywords: Granular materials: aggregation characteristics (e.g., grain size, particle size distribution, porosity) ; Polymer reactions and polymerization ; Colloids ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Nanocapsule preparative procedures are able to change the availability of drugs from delivery devices. In particular, the influence of the organic solvent, used in the interfacial polymerisation process, on the shape, mean particle size, size distribution and type of colloidal suspension was investigated. The organic solvents employed in the preparation of PECA nanocapsules were ethanol, acetone or acetonitrile. A non-ionic surfactant (Pluronic F68) was used during the preparation process. The amount of monomer represented another variable, capable of influencing the final carrier properties of PECA nanocapsules. The presence of ethanol achieved the formation of both nanoparticles and nanocapsules. However, the presence of acetone or acetonitrile achieved not only a highly homogeneous size colloidal system, but also the formation of only one type of PECA nanosphere (nanocapsule). The different amount of monomer led to the formation of nanocapsules with a wall thickness proportional to the initial concentration of the polymerising agent.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-1536
    Keywords: Key words Acryloylated polymers ; α ; β-poly(N-hydroxyethyl)-DL-aspartamide ; α ; β-polyaspar-thydrazide ; glycidylmethacrylate ; crosslinking ; hydrogels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  In the present study the derivatization of two water-soluble and synthetic polymers, such as α,β-poly(N-hydroxyethyl)-DL-aspartamide (PHEA) and α,β-polyasparthydrazide (PAHy), with glycidylmethacrylate (GMA) is described. This reaction allowed the introduction of double bonds in the macromolecular chains of PHEA and PAHy in order to make easier the crosslinking by a radical mechanism. Different parameters affected the reaction of derivatization, such as reaction pH, GMA concentration and reaction time. As far as PHEA is concerned the amount of GMA linked to the polymer increased until reaching a plateau. On the contrary, the reaction of PAHy with GMA proceeded with a zero order kinetics and the GMA amount in the polymer increased regularly. Some aqueous solutions of PHEA-GMA and PAHy-GMA copolymers at various GMA content were submitted to gamma radiation processing, thus obtaining crosslinked structures. The derivatization of PHEA and PAHy with GMA was a convenient method to introduce insaturations in their chains and it allowed to obtain gels at lower doses with respect to the starting polymers.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 273 (1995), S. 559-564 
    ISSN: 1435-1536
    Keywords: Crosslinked α, β-polyasparthydrazide ; hydrogels ; 5-fluorouracil ; prolonged drug release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract α, β-polyasparthydrazide (PAHy) was crosslinked by glutaraldehyde to form water-swellable materials possessing a three-dimensional molecular network. Different crosslinking degrees were prepared varying glutaraldehyde/PAHy ratio and samples containing 5-fluorouracil were obtained by incorporating the drug into the polymer networks during the crosslinking reaction. All samples were characterized by swelling tests, thermal, x-ray and SEM analysis. Their microstructure was observed through scanning electron microscopy. Furthermore, for samples containing the anticancer drug,in vitro release studies were performed in pH 7.4 buffer solution.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 272 (1994), S. 1637-1641 
    ISSN: 1435-1536
    Keywords: Crosslinked α,β-polyasparthydrazide ; hydrogels ; swellable micromatrices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The synthesis of a new crosslinked polymer by reaction of α, β-polyasparthydrazide and glutaraldehyde is reported. Different crosslinking degrees were obtained by varying the ratio between the aldehyde and the starting polymer. The crosslinked polymer was characterized by water swelling tests and thermal analysis. In particular, the crosslinking density and its effects on the glass transition temperature of the material were studied. Finally, the microstructure of the obtained polymer was observed using scanning electron microscopy.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 278 (2000), S. 69-73 
    ISSN: 1435-1536
    Keywords: Key words α,β-Polyasparthydrazide ; Gene therapy ; DNA complexes ; Gene delivery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Human gene therapy is one of the most promising methods developed in recent years, providing great potential for the treatment of a variety of diseases. Complexes formed between DNA and cationic polymers are attracting increasing attention as novel synthetic vectors for the delivery of genes. We have synthesized polycations with quaternary ammonium groups in their side chains for self-assembly with calf thymus DNA. This paper describes the functionalization of α,β-polyasparthydrazide (PAHy), a synthetic macromolecule having many potential applications in the field of biomedical sciences, with glycidyltrimethylammonuim chloride (GTA) in order to introduce positive charges into their chains. Derivatized PAHy with various GTA contents have been obtained and characterized. Highly functionalized copolymers have been used for condensing DNA, yielding discrete complexes. The complex formation has been confirmed by gel electrophoresis and the surface charge of interpolyelectrolyte complexes has been assessed by the zeta potential.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1590-3478
    Keywords: Apomorphine ; sulpiride ; haloperidol ; substantia nigra ; GAD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Sono stati studiati gli effetti comparativi dell' apomorfina, agonista recettoriale dopaminergico, e di due dopamino-bloccanti, l'aloperidolo ed il sulpiride, sull'attività glutamato decarbossilasica nella sostanza nera di ratto. I risultati ottenuti dimostrano che basse dosi (10,35 μg/kg, s.c.) di apomorfina inducono un decremento dell'attività GAD nigrale mentre un effetto opposto è indotto dalla dose più alta (1000 μg/kg, s.c.). Le dosi intermedie (100 e 500 μg/kg, s.c.) non inducono alcuna significativa modificazione. Il sulpiride alla dose usata (2 mg/kg, i.p.) causa un incremento dell'attività GAD mentre nessun effetto si osserva a seguito della somministrazione sistematica di aloperidolo. I risultati sono discussi alla luce di recenti dati neurochimici e comportamentali.
    Notes: Abstract The effects of different doses of the dopamine (DA) receptor agonist apomorphine on the activity of the γ-aminobutyric acid (GABA)-synthesizing enzyme glutamic acid decarboxylase (GAD, EC 4.1.1.15) were investigated in rat substantia nigra in comparison with haloperidol and sulpiride, two DA receptor blocking agents. Results obtained show that low doses (10,35 μg/kg, s.c.) of apomorphine induce a decrease in nigral GAD activity whilst an opposite effect is observed with the highest dose (1000 μg/kg, s.c.). No significant change is observed following injection of the intermediate doses (100 and 500 μg/kg, s.c.). Moreover, sulpiride at the dose used (2 mg/kg, i.p.) induces an increase in GAD activity whilst no effect follows systemic injection of the same dose of haloperidol. The results are discussed in light of recent neurochemical and behavioral data.
    Type of Medium: Electronic Resource
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