Metioninski i cisteinski kompleksi bakra(II) ; E-škola kemije - geografski dosezi

master's thesis

• Title (english): Methionine and cysteine complexes of copper(II) ; E-school of chemistry - geographical scope
• Author: Ines Mikulić
• Mentor: Nenad Judaš (mentor)
• Committee member: Nenad Judaš (predsjednik povjerenstva)
• Committee member: Iva Juranović Cindrić (član povjerenstva)
• Committee member: Zlatko Liber (član povjerenstva)
• Committee member: Petar Kružić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2016-07-19, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U ovom radu ispitana je mogućnost priprave monokristalnih uzoraka cisteinskih i metioninskih kompleksa bakra(II). Pri sintezama s cisteinom cilj je bio istražiti mogućnost usporavanja (ili sprječavanja) oksidacijsko-redukcijskog procesa između bakrovih(II) iona i molekula cisteina. To je pokušano na dva načina: smanjenjm polarnosti medija i kompleksiranjem bakrovih(II) iona molekulama glicina. Smanjenje polarnosti medija usporava oksidacijsko-redukcijsku promjenu, ali istovremeno loše utječe na topljivost reaktanata i otežava kristalizacijske postupke. Zaštita glicinom nije dala rezultata. S metioninom su sinteze provođene pri različitim temperaturama s ciljem dobivanja cis ili trans izomera. Dobiven je monokristalni uzorak trans izomera, koji kristalizira u monoklinskom sustavu, prostorna grupa P21, s parametrima jedinične ćelije:a = 9,485(1) Å, b = 5,063(1) Å, c = 15,580(1) Å, β = 92,40(1)°. Kristalografski podatci pohranjeni su u Cambridge Structura Database.
Metodički dio ovog diplomskog rada bavio se analizom dijela sadržaja portala E-škola kemije. Cilj je bio utvrditi kakvi su i koliki geografski dosezi tog dvadesetogodišnjeg internetskog projekta. Analizirano je 5000 odgovorenih pitanja koja su postavljena u periodu od studenoga 2000. godine do rujna 2012. godine. Analiza je pokazala koliko je ukupno škola čiji su učenici postavili pitanja, koje su to škole (iz kojih mjesta, županija, država), kakva je raspodjela učestalosti postavljenih pitanja prema školama, koriste li pojedinci usluge projekta nakon što završe osnovnu ili srednju školu, tko su korisnici (učenici, nastavnici, roditelji i ostali). Ujednoje napravljen i pregled autora odgovora broja odgovora koje je pojedini autor sastavio.

Abstract (english)

This diploma thesis deals with problems of obtaining single-crystals of cysteine and methionine complexes of copper(II). One strategy was to try to slow down (or prevent) reaction between copper(II) ions and cysteine molecules. This was tried by changing the polarity of reaction media and by masking copper(II) ions with glycine molecules. Reduced polarity slowed the reaction but also reduced the solubility of reactants and that had negative impact on crystalization proces. When workig with methionine the idea was to check the cis – trans equilibria at different temperatures. Single-crystal sample was obtained only for trans isomer. Crystal structure is monoclinic, space group P21, cell parameters: a = 9.485(1) Å, b = 5.063(1) Å, c = 15.580(1) Å,β = 92.40(1)°. Crystallographic data are deposited with Cambridge Structura Database.
Methodical (didactical) part of this diploma thesis is the analysis of part of data that are available on the web-site E-school of chemistry. The goal was to assess the geographical scope of this twenty years old internet web-site. Analysis was done on 5000 answers and questions given in period from November 2000 to September 2012. The data on number of schools whose pupils and students used the portal, their geographical origins (town, county, state), distribution and frequencies of schools, students and questions were determined. Also, a list of authors that provided answers to questions is given.

• Keywords: bakar(II); metionin; cistein; E-škola kemije; analiza; geograski dosezi
• Keywords (english): copper(II); methionine; cysteine; E-school of chemistry; data analysis; geographical scope
• Language: croatian
• URN:NBN: urn:nbn:hr:217:803815
• Study programme: Title: Integrated undergraduate and graduate university study of Biology and Chemistry Education; specializations in: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Course: Integrated undergraduate and graduate university study of Biology and Chemistry Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra edukacije biologije i kemije (magistar/magistra edukacije biologije i kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2017-09-01
• Created on: 2017-03-22 12:32:51