Die Embryonalentwicklung der Paradiesschnecke ... - TOBIAS-lib

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Kapitel 2 through a control embryo is shown. Until hatching, the embryonic development of controls is completed (Demian and Yousif, 1973a). Also, the embryos from the platinum exposure group have developed further (Fig. 7C). The developmental state of tentacles, foot, and ctenidium now correspond well to control embryos in Stage XI, the stage that is usually reached in controls after 6 days postfertilization. The ctenidium has elongated and added ctenidial leaflets, but it is still located on the left side of the visceral sac. Neither mantle edge nor shell gland nor the mantle anlage have grown craniad but remain to be located on the ventral side of the visceral sac. This can also be seen in Figure 7D, which shows a transverse section through the visceral sac of a Pt- exposed embryo. The shell-secreting tissue (arrows in Fig. 7D) is positioned in a cavity on the ventral side of the visceral sac right above the foot. The rotation of the visceropallium Figure 8A shows an embryo from the control group 3-day postfertilization. The visceral sac has rotated approximately 20 ◦ anticlockwise (angle between dashed lines 1 and 2 in Fig. 8A). The arrow indicates the direction in which the distal part of the mantle edge and the shell gland will grow as a result of the growth of the mantle anlage and the outer mantle epithelium. In contrast to that, the 4-day-old embryo from the platinum group (Fig. 8) does not show any rotation at all. At the age of 5 days (Fig. 8C), the rotation has been completed in the control embryo, whereas in the embryo from the platinum group the visceral sac still lays on the same axis as head and foot (Fig. 8D). Figure 8D shows that mantle edge, shell gland, and mantle anlage have been shifted from their initial left lateral position to the ventral side of the visceral sac indicating that, instead of a horizontal rotation by 180 ◦ , a vertical rotation of the visceral sac by 90 ◦ has taken place. Figure 8E,F displays the positions of intestine and anus in an adult shellless snail (Fig. 8E, anus with feces) and in a 7-day old, partly dissected embryo from the platinum exposure group (Fig. 8F). A comparison with the description of the development of the alimentary tract by Demian and Yousif 68
Kapitel 2 Fig. 7: M. cornuarietis, 9-day-old embryos; A: control embryo in Stage XII, right lateral view; B: histological transverse section of a control embryo, plane of section indicated by dashed line in sketch (left lateral view), HE staining; C: Pt-exposed embryo, left lateral view; and D: histological transverse section of a Pt-exposed embryo, arrows indicate shellsecreting tissue, plane of section indicated by dashed line in sketch (left lateral view), methylene blue staining. cn, ctenidium; f, foot; h, head; ls, larval stomach; m, mouth; mtc, mantle cavity; mte, mantle edge; sh, shell; shg, shell gland; tn, tentacle; vs, visceral sac. [Color figure can be viewed in the online issue, which is available at wileyonline<strong>lib</strong>rary.com.] (1973b) makes it evident that they have developed in the same position as in control animals. The shell-less individual in Figure 8E allows a close inspection of the intestine. Its shape resembles the form that was described by Demian and Yousif (1973b) for the usual arrangement of the intestine. The fate of the mantle edge Figure 9A–C illustrates the fate of the tissue equivalent to the mantle edge in a Pt-exposed M. cornuarietis individual. Figure 9A shows a transverse section of a part of the visceral sac and reveals the mantle edge to be posi- 69
Page 1 and 2:
Die Embryonalentwicklung der Paradi
Page 3 and 4:
Inhaltsverzeichnis Zusammenfassung
Page 5 and 6:
Zusammenfassung Hintergrund und Zie
Page 7 and 8:
Hintergrund und Zielsetzung der Arb
Page 9 and 10:
Hintergrund und Zielsetzung der Arb
Page 11 and 12:
Material und Methoden Marisa cornua
Page 13 and 14:
Material und Methoden Hälterung Di
Page 15 and 16:
Material und Methoden lindividuen a
Page 17 and 18:
Ergebnisse lung von Marisa cornuari
Page 19 and 20:
Ergebnisse Kapitel 3: Marschner, L.
Page 21 and 22: Ergebnisse Wachstum des Columellamu
Page 23 and 24: Diskussion Naticidae) entwickelt si
Page 25 and 26: Diskussion engrailed und dpp-BMP2/4
Page 27 and 28: Diskussion Abb. 4: Vergleich der mi
Page 29 and 30: Schlussfolgerung perimentell zu unt
Page 31 and 32: Literatur Engelhardt, W. (2008). Wa
Page 33 and 34: Literatur Ponder, W. F. und Lindber
Page 35 and 36: Kapitel 1:Turning snails into slugs
Page 37 and 38: Kapitel 1 dae). Their ontogeny also
Page 39 and 40: Kapitel 1 Exposure experiments Test
Page 41 and 42: Kapitel 1 et al. (2001, 2003) or wi
Page 43 and 44: Kapitel 1 for 4 × 5 min with PTw (
Page 45 and 46: Kapitel 1 treatment 29.9 ± 32.78%
Page 47 and 48: Kapitel 1 Fig. 2 3 : Images of M. c
Page 49 and 50: Kapitel 1 Fig. 4 4 : Location of th
Page 51 and 52: Kapitel 1 internal solid circular s
Page 53 and 54: Kapitel 1 ietis as it was shown for
Page 55 and 56: Kapitel 1 Burnett, L.E., Woodson, P
Page 57 and 58: Kapitel 1 Page, L.R., 2002. Ontogen
Page 59 and 60: Kapitel 2: Arresting mantle formati
Page 61 and 62: Kapitel 2 tropods (Crofts, 1937, su
Page 63 and 64: Kapitel 2 Scanning electron microsc
Page 65 and 66: Kapitel 2 called “mantle anlage
Page 67 and 68: Kapitel 2 Fig. 2: M. cornuarietis,
Page 69 and 70: Kapitel 2 and the visceral sac rema
Page 71: Kapitel 2 Seven-day-old embryos At
Page 75 and 76: Kapitel 2 gation of internal shells
Page 77 and 78: Kapitel 2 first tended to invaginat
Page 79 and 80: Kapitel 2 side of the visceral sac
Page 81 and 82: Kapitel 2 cornuarietis (Mesogastrop
Page 83 and 84: Kapitel 3: External and internal sh
Page 85 and 86: Kapitel 3 during embryonic developm
Page 87 and 88: Kapitel 3 Differential growth of ma
Page 89 and 90: Kapitel 3 sac, facing away from the
Page 91 and 92: Kapitel 3 Fig. 4 9 : SEM-images of
Page 93 and 94: Kapitel 3 Fig. 6: Histological sect
Page 95 and 96: Kapitel 3 side of the visceral sac
Page 97 and 98: Kapitel 3 different mechanism that
Page 99 and 100: Kapitel 3 whether the inhibition of
Page 101 and 102: Kapitel 3 tinuum of gradual morphol
Page 103 and 104: Kapitel 3 served one. However, ther
Page 105 and 106: Kapitel 3 hand and modified in Inks
Page 107 and 108: Kapitel 3 ticipated in designing th
Page 109 and 110: Kapitel 3 Demian, E. S. and Yousif,
Page 111 and 112: Kapitel 3 Page, L. R. (2003). Gastr
Page 113 and 114: Kapitel 4 Herewith, we were able to
Page 115 and 116: Kapitel 4 Histology and 3D reconstr
Page 117 and 118: Kapitel 4 72 or 96 hours at 6 ◦ C
Page 119 and 120: Kapitel 4 tioned on the ventral sid
Page 121 and 122: Kapitel 4 P2 does not curve backwar
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Kapitel 4 which this nerve is attac
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Kapitel 4 Fig. 5 13 : 3D reconstruc
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Kapitel 4 system in which the right
Page 129 and 130:
Kapitel 4 ready present during tors
Page 131 and 132:
Kapitel 4 Haydon, P. G., McCobb, D.
Page 133 and 134:
Kapitel 5: Quantifikation der Hsp70
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Kapitel 5 Die Gesamtproteinmenge wu
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Kapitel 5 steigt mit steigendem pro
Page 139 and 140:
Kapitel 5 Piano, A., Valbonesi, P.,
Page 141 and 142:
Publikationsliste • Marschner, L.
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Die Embryonalentwicklung der Paradiesschnecke ... - TOBIAS-lib

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