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| Language | English |
| Format | PDF (Premium Digital) |
| Ownership | Permanent download — yours forever |
Die elektronenmikroskopische Struktur der Eizelle by He Stegner
Die Eizelle der Siiugetiere und des Menschen enthiilt eine Vielzahl von Struk- turen, die durch die hohere Auflosung der Elektronenmikroskopie neu erschlossen oder genauer definiert werden konnten. Neben den geliiufigen, auch in vegetativen Zellen vorkommenden Organellen, finden sich speziell auf die Besonderheiten der Keimzelle abgestimmte Einschlusse. Form und Anordnung der Zellorganellen werden im Ablauf der Eireifung und fruhen Keimentwicklung stiindig veriindert. Da die Funktion der Zellorgane an bestimmte Muster und Kombinationen ge- bunden ist, sind aus der Ordnung der Zellstrukturen Riickschliisse auf ihre Bedeutung fUr die Keimentwicklung moglich. Experimentelle Untersuchungen zeigen, daB die Bildung einer Embryonalanlage an bestimmte Faktorenbereiche der Eizelle gebunden ist (SEIDEL, 1952a und b, 1956, 1960). Wieweit spezifisch histochemisch reagierende Areale (Verteilung der metachromotropen Substanz: DALCQ, 1951, 1952; JONES-SEATON, 1950; DE GEETER, 1954) diesen Faktoren- bereichen entsprechen, ist mit lichtmikroskopischen Methoden nicht zu kliiren. Nach orientierenden Untersuchungen zur Analyse der Feinstruktur und zur Er- fassung des Organellenbestandes der Siiugereizelle sind phasengerechte elektronen- mikroskopische Studien der Oogenese, Fertilisation und Blastogenese von aktuellem Interesse. Diese Untersuchungen geben unter anderem tiefere Ein- blicke in den formalen Ablauf der speziellen Teilungsvorgiinge, in die Natur der zelleigenen Reservestoffe und die cytologischen Korrelate der Informations- speicherung fiir die Keimentwicklung. Vergleichende elektronenmikroskopische Untersuchungen an tierischen Objekten haben in den letzten Jahren unabhiingig von der speciesbedingten Variabilitiit viele morphogenetische Probleme dem Verstiindnis niiher gebracht. NaturgemiiB stiitzen sich unsere Kenntnisse vor- wiegend auf Befunde an Laboratoriumstieren, bei denen eine phasengerechte Studie am ehesten moglich ist.| SKU | NLS9783540037705 |
|---|---|
| ISBN 13 | 9783540037705 |
| ISBN 10 | 3540037705 |
| Author | He Stegner |
| Series | Advances In Anatomy Embryology And Cell Biology |
| Condition | New |
| Binding Type | Paperback |
| Publisher | Springer |
| Year published | 1967-01-01 |
| Number of pages | 118 |
| Cover note | Book picture is for illustrative purposes only, actual binding, cover or edition may vary. |
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