(Reuters) – Shares in Britain’s Oxford Nanopore dropped nearly 12% on Tuesday, after the sensing technology company issued a revenue warning, citing a slowdown in China and the Middle East, along with staggered purchases from large clients. The company, which specialises in technology used to comprehend the biology of humans, plants, animals, bacteria and diseases like cancer, said the recent U.S. trade rules have heightened regulation of advanced artificial intelligence (AI) semiconductor sales. That has slowed growth in China and the Middle East, it added. The London-listed firm, which was s…