Search for the Singly Produced leptoquarks                                     
in e+e- Collisions at sqrt(s) = 189 GeV                                        
  
       A search for first generation scalar and vector leptoquarks (LQ)        
       as well as for squarks in R-parity violating SUSY models                
       has been performed using the full sample of e+e- collisions collected   
       by the OPAL detector at LEP at centre-of-mass energies of 189 GeV.      
       The number of selected events found in the two decay channels are       
       in agreement with the expectations                                      
       from Standard Model processes. This result allows to set                
       lower limits at the 95 % confidence level                               
       on the mass of first generation scalar (vector) leptoquarks and of      
       squarks in R-parity violating SUSY models.                              
  
 Parallel session :11                  
 Plenary  session :7a