By Susan Mathew (Reuters) -Germany’s DAX index fell on Monday after Russia’s Gazprom said a new turbine halt will further cut gas to Germany via the Nord Stream 1 pipeline, stoking supply worries, while a mixed batch of earnings raised concern about overall economic growth. The DAX erased afternoon gains to end 0.3% lower after Gazprom said it was halting the operation of another Siemens gas turbine at Nord Stream 1’s Portovaya compressor station, taking into account the technical condition of the engine. It said throughput from 0400 GMT on Wednesday would therefore fall to 33 million cubic me…