( ( ( ( A ( different kind ) ) ( of ( metastable ( nuclear state ) ) ) ) ( -LRB- ( isomer -RRB- ) ) ) ( ( is ( the ( fission ( isomer ( or ( shape isomer ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT A) (JJ different) (NN kind)) (PP (IN of) (NP (JJ metastable) (JJ nuclear) (NN state)))) (PRN (-LRB- -LRB-) (NP (NN isomer)) (-RRB- -RRB-))) (VP (VBZ is) (NP (DT the) (NN fission) (NN isomer) (CC or) (NN shape) (NN isomer))) (. .)))
A different kind of metastable nuclear state (isomer) is the fission isomer or shape isomer.
(ROOT (S (NP (NP (NNS Alkenes)) (PP (IN with) (NP (NP (DT the) (JJ same) (NNS atoms)) (PP (CC but) (NP (JJ different) (NNS shapes)))))) (VP (VBP are) (VP (VBN called) (NP (NNS isomers)))) (. .)))