Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae).

Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae). Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae). Abstract Text:

Macropsobrycon uruguayanae is a small, inseminating characid (tetra) of the tribe Compsurini. Although spermatozoa can be found within the ovarian cavity close to oocytes, the exact moment of fertilization has not yet been determined. Spermatozoa have moderately elongate nuclei with electron-dense chromatin. During spermiogenesis, nuclear rotation takes place. Elongate mitochondria with lamellar cristae are found posterior to the nucleus. Centrioles are parallel to one another with the proximal centriole slightly anterior to the longer distal one. The anterior tip of the proximal centriole is located within a shallow nuclear fossa. Electron-dense spurs are associated within the anterior and posterior ends of the distal centriole. Striated centriolar rootlets radiate both anteriorly and posteriorly from the distal centriole. Nine longitudinal accessory microtubules surround the axoneme in the proximal flagellum. The flagellum has a typical 9 + 2 axoneme with no intratubular differentiation. Atypical spermatozoa are also found in the testicular lumen. These cells resemble spermatozoa in most aspects, except that their nuclei are variable in shape, with the granular chromatin less electron-dense than that seen in spermatozoa. The origin and function of these cells could not be determined. The specializations seen in the spermatozoa are discussed as possible adaptations related to the habit of insemination. J. Morphol., 2008. (c) 2008 Wiley-Liss, Inc.

Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae). Publishing Authors By Initials

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae). Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of morphology

VOLUME: 269

Page Numbers: 691-7

Journal Abbreviation: J. Morphol.

ISSN: 0362-2525

DAY: 20

MONTH: Jun

YEAR: 2008

Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae). Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 406125

Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae). Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae). Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae).

AFFILIATION: Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: J Morphol

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae Teleostei: Characidae: Cheirodontinae Related Publications

• A case series of pediatric primary central nervous system lymphoma: favorable outcome without cranial irradiation.
• Association between infant breastfeeding and early childhood caries in the United States.
• Caries status and overweight in 2- to 18-year-old US children: findings from national surveys.
• Daily care of the newborn infant with reference to early warning signs of complications.
• Deciphering AP-1 function in tumorigenesis: Fra-ternizing on target promoters.
• Differential requirements of the C terminus of Nbs1 in suppressing adenovirus DNA replication and promoting concatemer formation.
• Distinct requirements of adenovirus E1b55K protein for degradation of cellular substrates.
• Health and supportive care needs of young adult cancer patients and survivors.
• Nonattendance in a dermatology clinic--a large sample analysis.
• Patterns of daytime sleepiness in narcoleptics and normals: a pupillometric study.
• Prenatal tobacco smoke and postnatal secondhand smoke exposure and child neurodevelopment.
• Preventive counseling at adolescent ambulatory visits.
• Saprophytic molds as agents of cutaneous and subcutaneous infection in the immunocompromised host.
• Skeletal Langerhans cell histiocytosis in children: permanent consequences and health-related quality of life in long-term survivors.
• Sperm ultrastructure in the inseminating Macropsobrycon uruguayanae (Teleostei: Characidae: Cheirodontinae).
• Synovial sarcoma in childhood.
• Teen pregnancy and urban youth: competing truths, complacency, and perceptions of the problem.
• The Mre11/Rad50/Nbs1 complex limits adeno-associated virus transduction and replication.
• The effect of aqueous humor suppressants on intravitreal gas bubble duration in rabbits.
• The efficacy of rituximab in high-grade pediatric B-cell lymphoma/leukemia: a review of available evidence.
• The maturation and interrelationship of EEF patterns and auditory evoked response in premature infants.
• Transient neurological symptoms after isobaric subarachnoid anesthesia with 2% lidocaine: the impact of needle type.
• Using case study methods to investigate the effects of interactive intervention for children with autism spectrum disorders.
• Uveitis associated with OKT3 therapy for renal transplant rejection.
• Where do adolescents get their condoms?