A teacher teaching about folic acid and how it helps neurulation.
A teacher is teaching a scientific topic.
When speaking of folic acid and neurulation  the topic is scientific.
(x)
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_teach(e1) & n_topic(x2) & a_scientific(s1) & Theme(s1,x2) & n_teacher(x1))