| polarization of tryptophan fluorescence from single striated muscle fibers. a molecular probe of contractile state. | instrumentation has been developed to detect rapidly the polarization of tryptophan fluorescence from single muscle fibers in rigor, relaxation, and contraction. the polarization parameter (p( perpendicular)) obtained by exiciting the muscle tryptophans with light polarized perpendicular to the long axis of the muscle fiber had a magnitude p( perpendicular) (relaxation) > p( perpendicular) (contraction) > p( perpendicular) (rigor) for the three types of muscle fibers examined (glycerinated rabbi ... | 1972 | 4332133 |
| lethocerus americanus, the "toe biter". | lethocerus americanus is a large water bug commonly found in ponds and slowly moving fresh water. also known as the "toe biter" for its encounters with swimmers, it has the reputation of inflicting painful bites when carelessly handled. it normally feeds on other pond life: insects, tadpoles, salamander, small fish, and snails. these large tan or brown bugs may leave their habitat at night in search of mates or another pond. it is thought that the relative nearness of bright lights for a creatur ... | 1998 | 10328676 |