The fourth instars of An. sinensis (Shanghai strain) were preserved in Carnoy's solution (Methanol: Glacial Acetic acid = 3∶1).
Three to four hours before the experiment, the test animals (n =10 females in the second adult instar of a given clone) were placed in dechlorinated tap water in the culture room to acclimatize to this medium.
It is relevant that, although defence appears to be the most widespread and obvious of these behaviours, it need not feature in altruists' repertoire: we know, for example, that the first instars of Hormaphis betulae, a species without soldiers, co-operate to push large masses of honeydew out of their galls [ 2].
Because of such short periods of infectivity, the occurrence of endemic cycles of TBEV depends on coincident seasonal activities of different I. ricinus tick instars, coupled with aggregation of ticks of more than one instar on a small proportion of the rodent population (38 ).
Third instars of C. ulrichii reach a length of 40 mm, whereas the specific throat bot fly larvae of roe deer, C. stimulator, reaches a length of 30 mm [ 1, 2], probably reflecting a restriction imposed by the size of their host.
While each species probably has a somewhat different ontogenetic trajectory, it has been shown that the disparity in three different species of Adelopthalmus is not great [ 9] and so the instars of Strobilopterus proteus are considered a good proxy for those of the other Strobilopterus species.
The experiment showed that G. anceps in particular can prey on all instars of both mosquito species and maintain a steady predation rate over time.
Individuals in the 5th and 6th instar of E. propertius and 3rd and 5th instars of P. zelicaon were exposed to a desiccation agent (silica gel) for 120 minutes.
a Nymphal compound eye in the first instar nymph of a grasshopper illustrating a typical compound eye.
Higenamine was evaluated for in vivo antimycobacterial efficacy using Galleria mellonella, a sixth instar larva of a great wax moth as an in vivo infection model, while Mycobacterium indicus pranii (MIP) was used as a test microorganism in the assay.
