Ultrastructure of spermiogenesis and spermatozoa in <ce:italic>Marchalina hellenica</ce:italic> (Gennadius) (Hemiptera: Sternorrhyncha, Marchalinidae)

Ultrastructure of spermiogenesis and spermatozoa in <ce:italic>Marchalina hellenica</ce:italic> (Gennadius) (Hemiptera: Sternorrhyncha, Marchalinidae)

The spermiogenesis, the sperm structure and the sperm motility of Marchalina hellenica (Gennadius) were examined. In the early spermiogenesis a centriolar apparatus was identified, but this structure is not involved in the production of the sperm flagellum. As in other Coccoidea, the flagellar axone...

Ausführliche Beschreibung

Bibliographische Detailangaben
Veröffentlicht in:Ventricular Restraint Improves Outcomes in HF Patients with CRT. - 2011. - Amsterdam [u.a.]
1. Verfasser: Dallai, Romano (VerfasserIn)
Weitere Verfasser: Mercati, David (BerichterstatterIn), Gounari, Sofia (BerichterstatterIn), Paoli, Francesco (BerichterstatterIn), Lupetti, Pietro (BerichterstatterIn)
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017transfer abstract
Zugriff auf das übergeordnete Werk:Ventricular Restraint Improves Outcomes in HF Patients with CRT
Schlagworte:Scale insect Insect sperm ultrastructure SEM Sperm motility TEM MTOC
Umfang:12
LEADER 01000caa a22002652 4500
001 ELV035725095
003 DE-627
005 20230625205343.0
007 cr uuu---uuuuu
008 180603s2017 xx |||||o 00| ||eng c
024 7 |a 10.1016/j.asd.2017.03.004  |2 doi 
028 5 2 |a GBV00000000000384.pica 
035 |a (DE-627)ELV035725095 
035 |a (ELSEVIER)S1467-8039(17)30034-8 
040 |a DE-627  |b ger  |c DE-627  |e rakwb 
041 |a eng 
082 0 4 |a 610  |q VZ 
082 0 4 |a 670  |q VZ 
084 |a 51.75  |2 bkl 
100 1 |a Dallai, Romano  |e verfasserin  |4 aut 
245 1 0 |a Ultrastructure of spermiogenesis and spermatozoa in <ce:italic>Marchalina hellenica</ce:italic> (Gennadius) (Hemiptera: Sternorrhyncha, Marchalinidae) 
264 1 |c 2017transfer abstract 
300 |a 12 
336 |a nicht spezifiziert  |b zzz  |2 rdacontent 
337 |a nicht spezifiziert  |b z  |2 rdamedia 
338 |a nicht spezifiziert  |b zu  |2 rdacarrier 
520 |a The spermiogenesis, the sperm structure and the sperm motility of Marchalina hellenica (Gennadius) were examined. In the early spermiogenesis a centriolar apparatus was identified, but this structure is not involved in the production of the sperm flagellum. As in other Coccoidea, the flagellar axoneme originates by the activity of the thickened tip of the numerous microtubules surrounding the nuclear anterior region close to the periphery of the cell. This region pushes against a narrow cytoplasmic layer, giving rise to a papilla. In this region a novel structure, consisting of a regular network of thin filaments, arranged orthogonally to the bundle of microtubules, is visible. The sperm flagellum consists of a series of about 260 microtubules, regularly arranged in rings around the axial nucleus. This latter extends in the middle part of the sperm length. As usual in scale insects, sperm form a bundle, which in M. hellenica is composed of 64 sperm cells, surrounded by somatic cyst cells. The sperm bundle has an helicoidal array, with a cap of dense material at its apex, lending the anterior and the posterior region of the sperm bundle with a different structural organization. This difference is responsible of the different speed gradient observed in the helical wave propagating along the sperm bundle. 
520 |a The spermiogenesis, the sperm structure and the sperm motility of Marchalina hellenica (Gennadius) were examined. In the early spermiogenesis a centriolar apparatus was identified, but this structure is not involved in the production of the sperm flagellum. As in other Coccoidea, the flagellar axoneme originates by the activity of the thickened tip of the numerous microtubules surrounding the nuclear anterior region close to the periphery of the cell. This region pushes against a narrow cytoplasmic layer, giving rise to a papilla. In this region a novel structure, consisting of a regular network of thin filaments, arranged orthogonally to the bundle of microtubules, is visible. The sperm flagellum consists of a series of about 260 microtubules, regularly arranged in rings around the axial nucleus. This latter extends in the middle part of the sperm length. As usual in scale insects, sperm form a bundle, which in M. hellenica is composed of 64 sperm cells, surrounded by somatic cyst cells. The sperm bundle has an helicoidal array, with a cap of dense material at its apex, lending the anterior and the posterior region of the sperm bundle with a different structural organization. This difference is responsible of the different speed gradient observed in the helical wave propagating along the sperm bundle. 
650 7 |a Scale insect  |2 Elsevier 
650 7 |a Insect sperm ultrastructure  |2 Elsevier 
650 7 |a SEM  |2 Elsevier 
650 7 |a Sperm motility  |2 Elsevier 
650 7 |a TEM  |2 Elsevier 
650 7 |a MTOC  |2 Elsevier 
700 1 |a Mercati, David  |4 oth 
700 1 |a Gounari, Sofia  |4 oth 
700 1 |a Paoli, Francesco  |4 oth 
700 1 |a Lupetti, Pietro  |4 oth 
773 0 8 |i Enthalten in  |n Elsevier Science  |t Ventricular Restraint Improves Outcomes in HF Patients with CRT  |d 2011  |g Amsterdam [u.a.]  |w (DE-627)ELV015921530 
773 1 8 |g volume:46  |g year:2017  |g number:4  |g pages:601-612  |g extent:12 
856 4 0 |u https://doi.org/10.1016/j.asd.2017.03.004  |3 Volltext 
912 |a GBV_USEFLAG_U 
912 |a GBV_ELV 
912 |a SYSFLAG_U 
912 |a GBV_ILN_11 
912 |a GBV_ILN_20 
912 |a GBV_ILN_21 
912 |a GBV_ILN_22 
912 |a GBV_ILN_24 
912 |a GBV_ILN_26 
912 |a GBV_ILN_31 
912 |a GBV_ILN_39 
912 |a GBV_ILN_40 
912 |a GBV_ILN_49 
912 |a GBV_ILN_50 
912 |a GBV_ILN_60 
912 |a GBV_ILN_62 
912 |a GBV_ILN_65 
912 |a GBV_ILN_69 
912 |a GBV_ILN_70 
912 |a GBV_ILN_72 
912 |a GBV_ILN_90 
912 |a GBV_ILN_100 
912 |a GBV_ILN_120 
912 |a GBV_ILN_130 
912 |a GBV_ILN_131 
912 |a GBV_ILN_179 
912 |a GBV_ILN_227 
912 |a GBV_ILN_285 
912 |a GBV_ILN_350 
912 |a GBV_ILN_618 
912 |a GBV_ILN_694 
912 |a GBV_ILN_697 
912 |a GBV_ILN_807 
912 |a GBV_ILN_2001 
912 |a GBV_ILN_2003 
912 |a GBV_ILN_2005 
912 |a GBV_ILN_2006 
912 |a GBV_ILN_2007 
912 |a GBV_ILN_2008 
912 |a GBV_ILN_2009 
912 |a GBV_ILN_2010 
912 |a GBV_ILN_2011 
912 |a GBV_ILN_2014 
912 |a GBV_ILN_2015 
912 |a GBV_ILN_2018 
912 |a GBV_ILN_2019 
912 |a GBV_ILN_2020 
912 |a GBV_ILN_2021 
912 |a GBV_ILN_2023 
912 |a GBV_ILN_2035 
912 |a GBV_ILN_2056 
912 |a GBV_ILN_2124 
912 |a GBV_ILN_2156 
912 |a GBV_ILN_2208 
912 |a GBV_ILN_2469 
912 |a GBV_ILN_2470 
912 |a GBV_ILN_2505 
936 b k |a 51.75  |j Verbundwerkstoffe  |j Schichtstoffe  |q VZ 
951 |a AR 
952 |d 46  |j 2017  |e 4  |h 601-612  |g 12