(S (S (NP (BASENP (NN Residue) (NN accumulation)) (PP (IN around) (NP (BASENP (DT the) (NNS vents)) (PP (IN of) (BASENP (DT the) (NNP Elektron) (NN oxygen) (NN generator)))))) (VP (VBD was) (VP (VP (VBN noted) (CC and) (VBN photographed)) (PP (IN by) (BASENP (NNP Sharipov)))))) (PERIOD .))