| PHYSICS |   |   | 
|   Anthony R. Hassan |     | 5 | 
| Aco JanićijevićNebojša Danilović
 |   Crystallization support tube in a laboratory furnace   | 19 | 
| Hristina S. DelibašićVioleta M. Petrović
 Kristina I. Isaković
 |   The effects of the perturbated ionization potential and the Magnetic Component on the relativistic transition rate   | 23 | 
| CHEMISTRY |   |   | 
| Mahdieh Azari  |    |  33 | 
| Sara MehdipourMehdi Alaeiyan
 Ali Nejati
 |    | 49   | 
| Zorka Stanić Radmila DŽudović
 Branislav Vukanović
 Ljiljana Jakšić
 |   Pyrite/pyrrhotite mineral based electrochemical sensor for redox determination in aqueous media   | 57
   | 
|   Malek Taher Maghsoodlou Seyyed Rasul Mousavi
 Ali Roygar
 Mojtaba Lashkari
 |   Three-component carbon-carbon bond-forming reactions for the synthesis of β-amino carbonyl compounds using maleic acid-catalyzed one-pot mannich-type reaction in ethanol    | 71 | 
|   Jelena S. RuparVladimir D. Dobričić
 Mara M. Aleksić
 Jasmina S. Brborić
 Olivera A. Čudina
 |    | 83 | 
|   Jelena S. SavićBojan Marković
 Vesna Vitnik
 Sanda P. Dilber
 |    |     103 | 
|   Nenad L. VukovićMilena D. Vukić
 Gorica T. Đelić
 Miroslava M. Kacaniova
 Mirjana Cvijović
 |    | 113 | 
| Fausat K. Ola–Mudathir Arogundade Abdul Wahab
 Efere M. Obuotor
 Abdullahi I. Moshood
 |    Comparative evaluation of antioxidant properties of methanol  extracts of Allium  cepa, Allium cepa peel and Allium  fistulosum    | 131 | 
|   Mirjana DragoljićBranka Rodić-Grabova
 Ljubica Vasiljević
 Vesna Matić
 Ljiljana O. Simurdić
 |    Trend of the psychoactive potential of Cannabis sativa L. plant    samples    | 143 | 
| BIOLOGY |   |  | 
| Darko V. Grujičić Marina Z. Radović    Jakovljević
 Olgica B. Mihaljević
 Snežana T. Živančević-  Simonović
 Olivera M. Milošević-    Djordjević
 | Association of GSTT1 and GSTM1 gene polymorphisms with  susceptibility to autoimmune diseases: a preliminary study | 153 | 
| Radmila M. Glišić Maja M. Čakić-Milošević
 Mirela M. Ukropina
 |    | 163 | 
|   Milena M. Jovanović    Maja Đ. Ćupurdija    Danijela D. Nikodijević    Milena G. Milutinović    Danijela M. Cvetković    Jelena D. Rakobradović    Snežana D. Marković  |   | 175 | 
|   Olufunmiso Olusola      OlajuyigbeAnthony J. Afolayan
 |   In vitro inhibitory effects of the ethanol extract of Tetrapleura tetraptera (Schum and Thonn.) Taub. against multidrug resistant Staphylococcus aureus   | 193 
 | 
|   Katarina G. MladenovićMirjana Ž. Muruzović
 Tanja D. Žugić-Petrović
 Ljiljana R. Čomić
 | The influence of environmental factors on the planktonic growth and biofilm formation of Escherichia coli | 205 | 
|   Sandra M. Grujić Ivana D. Radojević
 Sava M. Vasić
 Ljiljana R. Čomić
 Aleksandar M. Ostojić
 |   Heavy metal tolerance and removal efficiency of the Rhodotorula mucilaginosa and Saccharomyces boulardii planktonic cells and biofilm | 217 | 
|   Snežana B. SimićAna S. Petrović
 Nevena B. Đorđević
 Božica M. Vasiljević
 Nataša M. Radojković
 Aleksandra B. Mitrović
 Milutin G. Janković
 |  Indicative ecological status assessment of the Despotovica River  | 227 |