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1.
Epoxide ring opening of (3S,4R)-3-[(1R)-1-(tert- butyldimethylsilyloxy)ethyl]-4-[(1'r,2's,3'r)-1',2'-epoxycyclohex-3'-yl] azetidin-2-one with the nucleophiles under the microwave irradiation
Gregor Vilfan, 2008, magistrsko delo

Najdeno v: ključnih besedah
Povzetek najdenega: ... ß-lactamase inhibitor, trinemi, stereoselektivna sinteza, regioselektivna sinteza, odpiranj...
Ključne besede: ß-lactamase inhibitor, trinemi, stereoselektivna sinteza, regioselektivna sinteza, odpiranje epoksida, MAOS, magistrske naloge
Objavljeno: 15.10.2013; Ogledov: 5938; Prenosov: 378
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

2.
1,8-dihydroxy naphthalene (DHN) - melanin confers tolerance to cadmium in isolates of melanised dark septate endophytes
Marjana Regvar, Jože Grdadolnik, Iztok Arčon, Katarina Vogel-Mikuš, Matevž Likar, Mateja Potisek, 2021, izvirni znanstveni članek

Opis: The contribution of 1,8-dihydroxy naphthalene (DHN) melanin to cadmium (Cd) tolerance in two dark septate endophytes (DSE) of the genus Cadophora with different melanin content was investigated in vitro. The DSE isolate Cad#148 with higher melanin content showed higher tolerance to Cd than the less melanised Cad#149. Melanin synthesis was significantly reduced by Cd in both isolates with uninhibited melanin synthesis, in a dosedependent manner. Inhibition of melanin synthesis by tricyclazole reduced the relative growth of Cad#148 exposed to Cd and did not affect Cad#149. Cd accumulation was not altered by tricyclazole in the two isolates, but it increased catalase and reduced glutathione reductase activity in more melanised Cad#148, indicating higher stress levels. In contrast, in Cad#149 the enzyme activity was less affected by tricyclazole, indicating a more pronounced role of melanin-independent Cd tolerance mechanisms. Cd ligand environment in fungal mycelia was analysed by extended EXAFS (X-ray absorption fine structure). It revealed that Cd was mainly bound to O- and S-ligands, including hydroxyl, carboxyl, phosphate and thiol groups. A similar proportion of S- and Oligands (~35% and ~65%) were found in both isolates with uninhibited melanin synthesis. Among O-ligands two types with Cd-O-C- and Cd-O-P- coordination were identified. Tricyclazole altered Cd-O- ligand environment in both fungal isolates by reducing the proportion of Cd-O-C- and increasing the proportion of Cd-O-P coordination. DHN-melanin, among other tolerance mechanisms, significantly contributes to Cd tolerance in more melanised DSE fungi by immobilising Cd to hydroxyl groups and maintaining the integrity of the fungal cell wall.
Najdeno v: ključnih besedah
Povzetek najdenega: ...DSE, melanin, Cd tolerance, inhibitor tricyclazole, antioxidant enzymes, EXAFS...
Ključne besede: DSE, melanin, Cd tolerance, inhibitor tricyclazole, antioxidant enzymes, EXAFS
Objavljeno: 13.07.2021; Ogledov: 1141; Prenosov: 0
.pdf Polno besedilo (1,73 MB)

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