. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COCKROACH MOLTING CYCLE EVENTS 267 A map of quantal events Since all events could not be assayed during any one experiment, overlapping sets of events were assayed and a summary comparison was computed statistically according to Finney (1952). Table I lists the six sets of events with their T50'8 and associated standard errors. The table also lists the standard deviation of the distribution of the event in time within the culture; this measures the departure of the event from perfect synchrony. The departure from perfect syn
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COCKROACH MOLTING CYCLE EVENTS 267 A map of quantal events Since all events could not be assayed during any one experiment, overlapping sets of events were assayed and a summary comparison was computed statistically according to Finney (1952). Table I lists the six sets of events with their T50'8 and associated standard errors. The table also lists the standard deviation of the distribution of the event in time within the culture; this measures the departure of the event from perfect synchrony. The departure from perfect synchrony is a limiting factor in the usefulness of these cultures in studying developmental phe- omnena. The average departure from perfect synchrony computed from Table I is about ten hours. The overlapping sets of events listed in Table I are summarized diagrammatic- ally in a temporal map, Figure 4. In this composite, events which could not be distinguished in time at the 5 per cent level of significance are grouped within a bracket. Thus the critical period for the head is indistinguishable in timing from the critical period for regeneration. Although statistical simultaneity does not mean absolute simultaneity, this close association of the two phenomena is sug- gestive of causal relationships. Another group of events which are closely as- sociated with one another are the critical period for the prothorax, the end of epidermal mitoses and the appearance of nerve coils in the molting space. Since the prothoracic glands are a source of ecdysone, this close association also has possible causal significance. Besides pointing out groups of closely associated events, the mapping technique is useful in estimating the times when a particular event or process of interest is occurring with maximal frequency in a culture, for instance the map states that bristle morphogenesis takes approximately ten hours starting at 78 hours after feeding. pgfb. bmb bme mar. Please note that these im
Size: 1831px × 1364px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
