. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 142 J J. CHILDRESS ET AL. Hemoglobin Fraction I (mM) Figure 2. Frequency distributions of the concentrations of the large hemoglobin [FI, X 10" Mr, (Terwilliger el al. 1980; Arp el 1987)] in coelomic fluid and hemolymph of Ri/tia pachvptila kept for 24 h at different external sultide and d concentrations. - O °8 H 'E ° H 01 o - y = 00133*0 176x . R= 090 4 6 8 10 Hemolymph XH2S (mM) 12 Figure 3. Coelomic fluid -H,S as a function of hemolymph iH:S in Rifia pachypltla kept for 24 h at different external su
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 142 J J. CHILDRESS ET AL. Hemoglobin Fraction I (mM) Figure 2. Frequency distributions of the concentrations of the large hemoglobin [FI, X 10" Mr, (Terwilliger el al. 1980; Arp el 1987)] in coelomic fluid and hemolymph of Ri/tia pachvptila kept for 24 h at different external sultide and d concentrations. - O °8 H 'E ° H 01 o - y = 00133*0 176x . R= 090 4 6 8 10 Hemolymph XH2S (mM) 12 Figure 3. Coelomic fluid -H,S as a function of hemolymph iH:S in Rifia pachypltla kept for 24 h at different external sulfide concentrations and>42 confluent at the size of the smaller hemoglobin, because the concentrations in the two compartments were signif- icantly correlated. However, re-analysis showed that while the concentrations were significantly correlated in their data, the coelomic fluid had higher concentrations pre- cluding confluence for this size molecule (Table II). Although the two compartments do not exchange he- moglobin molecules, it is apparent that small dissolved molecules are readily exchanged, because the higher O2, higher pH group had highly significant correlations be- tween the values of all of the measured parameters be- tween the two compartments (Table III). In addition, there were significant differences in the values of all of these parameters, except thiosulfate, between the compart- ments, apparently resulting from their interactions with the hemoglobins. 2H2S was in much higher concentra- tions in the hemolymph (Fig. 3) than in the coelomic fluid because of the much higher concentrations of he- moglobin FI, which binds 3 moles of sulfide per mole of heme, although this binding is not to the heme group itself (Arp el al., 1987), versus 1 mole of sulfide per mole of heme for F II (Fig. 2). These correlations and distri- butions indicate that these worms were circulating their blood effectively. In contrast, the low O2, low pH group had no significant corre
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology