Consulta: subjectFacets:"Gonad"
Registros recuperados: 9
Data/hora: 09/06/2024 08:57:44

Evaluation of the gonad volume throughout magnetic resonance imaging in Crassostrea gigas and comparison with the histological method
Provedor de dados: 5
Autores: Flahauw, Emilie; Davenel, Armel; Quellec, Stéphane; Quillien, Virgile; Degremont, Lionel; Lapegue, Sylvie; Hatt, Philippe-jacques.
Biological parameters of the cupped oyster Crassostrea gigas such as growth, reproductive effort (duration of the gametogenesis, date of spawning, and fecundity) differ widely among oysters in the same location. Furthermore, most of the traditional methods, like histological observations, could lead to large variability on the observations and the measurements ofthese traits, and large uncertainties on their changes over time. These can be drastically reduced by using Magnetic Resonance Imaging (MRI) which is a non invasive method allowing to measure the same individual during its development. Forty oysters were assessed using MRI for the volume of whole soft body, the intra valves space, the adductor muscle, and the gonad, which also include the digestive...
Tipo: Text
Palavras-chave: Molluscs; Crassostrea gigas; Gonad; Histology; MRI.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00107/21784/19370.pdf

Viral gametocytic hypertrophy of Crassostrea gigas in France: from occasional records to disease emergence?
Provedor de dados: 5
Autores: Garcia, Celine; Robert, Maeva; Arzul, Isabelle; Chollet, Bruno; Joly, Jean-pierre; Miossec, Laurence; Comtet, Thierry; Berthe, Franck.
Viral gametocytic hypertrophy was reported for the first time in 2001 in Pacific oyster Crassostrea gigas in France. Since this date, the number of reported cases and the distribution area have increased every year; however, the cases are not associated with macroscopic signs or increased mortality rates. Both male and female gametes were hypertrophied and basophilic inclusions were observed in gamete nuclei, Transmission electron microscopy revealed the presence of viral particles in these intranuclear basophilic inclusions. These particles had characteristics similar to those of the Papillomaviridae and Polyomaviridae families: they were small, non-enveloped, icosahedral, and 44 to 56 nm in diameter, The viral particles were found in male, female and...
Tipo: Text
Palavras-chave: Polyomaviridae; Papillomaviridae; Gonad; Viral garnetocytic hypertrophy; Pacific oyster; Crassostrea gigas.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3288.pdf

Morphological and Morphometric Aspects of Crassostrea rhizophorae (Guilding, 1828) Oocytes in Three Stages of the Gonadal Cycle
Provedor de dados: 77
Autores: Ferreira,M. A. P.; Paixão,L. F.; Alcântara-Neto,C. P.; Santos,S. S. D.; Rocha,R. M.
Crassostrea rhizophorae (Guilding, 1828) is one of the tropical species of oysters cultivated on the Brazilian shore. Despite its high commercial value, there is no information on the gonadal characteristics during the reproductive stages of this species. The objective of this work was to analyze the morphology and morphometry of Crassostrea rhizophorae oocytes and follicles in three stages of the gonadal cycle. Were analized histological sections of gonads considering that the oocytes presented visible nuclei and nucleoli, it was observed three gonadal cycle stages: early gametogenesis, growth and maturation. In the early gametogenesis stage, follicles and oocytes presented diameters of 180.29 (± 41.91) and 18.66 (± 6.85) µm, respectively, and presence of...
Tipo: Journal article
Palavras-chave: Crassostrea; Oocyte; Gonad; Morphology.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400023

Gonadal development and sexuality of Larkinia grandis (Arcida: Arcidae) inhabiting southeastern Gulf of California
Provedor de dados: 103
Autores: Sotelo-Gonzalez,Maria I.; García-Ulloa,Manuel; Góngora-Gómez,Andrés M.; Salcido-Guevara,Luis A.; Arzola-González,Juan F.; Sepúlveda,Carlos H.; Sánchez-Cárdenas,Rebeca.
ABSTRACT Larkinia grandis (Broderip &amp; G.B. Sowerby I, 1829), an important fishing resource for Mexican communities, is an Arcidae clam. It is also considered a species with aquaculture potential. In this work we investigated the gonadal phases and sexuality in a population of L. grandis in the Gulf of California. Our findings support the hypothesis that there is one male per female in the population studied. It also documents that the shape, position and color of the gonads of L. grandis are consistent with observations in other Arcidae species. Additionally, five gonadal phases are differentiated and described in males and females (development, mature, spawning, post-spawning and resting), with a noticeable presence of brown cells during post-spawning...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bivalve; Estuary; Gametogenesis; Gonad; Mangrove cockle; Sex cells.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702021000100306

Ovarian radiographic and direct measurements of Japanese Quail ( Coturnix coturnix japonica ) submitted to light restriction
Provedor de dados: 45
Autores: Albuquerque,M.; Guedes,R.; Dornbusch,P.; Laskoski,L.; Mangini,P.; Lange,R.
ABSTRACT Often, in pet birds, any stimulus to lay eggs is unwanted in order to reduce reproductive diseases and disorders. The objectives of this study were: to determine the time necessary to promote ovary involution after an eight hour photoperiod using laying Japanese quails (Coturnix coturnix japonica); to connect the ovarian radiographic measurements with egg production; and to compare these measurements with direct ovary data obtained at necropsy. Birds were separated into three groups: 12h/24d (control group - 12h photoperiod for 24 days), 8h/24d and 8h/36d (8h photoperiod for 24 and 36 days). After euthanasia, all cadavers were x-rayed to measure ovary length and height. Birds were necropsied to measure ovarian length and weight. Results:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avian; Photoperiod; Gonad; Laying; Radiography.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000300651

Reproductive dynamics of Leporinus obtusidens captured downstream from an important hydropower Station in Brazil
Provedor de dados: 45
Autores: Andrade,E.S.; Felizardo,V.O.; Murgas,L.D.S.; Drumond,M.M.; Zangerônimo,M.G.; Costa,S.F.
This study evaluated the reproductive dynamics and gonadal morphology of piaparas (Leporinus obtusidens) captured downstream from the Funil Hydroelectric Power Station. The 107 piaparas evaluated were captured monthly from Sep 2006 to Aug 2007. The data were stratified among the seasons to evaluate gonad maturation and the reproductive period was determined by assessing the gonadosomatic index, hepatosomatic index, abdominal fat index (AFI), weight:length ratio, condition factor and sexual proportion. The reproductive period lasted from winter to summer (Jul-Mar) in females and from spring to autumn (Sept-Jun) in males. AFI was high during and after the reproductive period in females and only during the reproductive period in males. The highest HIS values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Reproduction; Piracema; Histology; Gonad.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352013000500021

Effect of Intermittent Feeding on Gonadal Function in Male And Female NMRI Mice During Chronic Stress
Provedor de dados: 52
Autores: Ehteram,Badri Zarrin; Sahraei,Hedayat; Meftahi,Gholam Hossein; Khosravi,Maryam.
ABSTRACT Stress can inhibit gonadal activity via Hypothalamus-Pituitary-Gonad (HPG) axis activity suppression. In the present study, effects of intermittent feeding (IF) on gonadal function under stress in male and female mice were evaluated. Twenty eight male and twenty eight female mice's were divided into four groups. The control group received adequate food and water without stress. The second group received four days of electric shock without food deprivation. The third group was deprived of food two hours/day for a week, and the fourth group was deprived of food (2 hours/day for seven consecutive days) and then electric foot shock stress was applied to them for four days. Blood samples were collected from all animals for plasma testosterone, estrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estrogen; Gonad; IL-6; Intermittent Feeding; Stress; Testosterone.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100439

Ovary maturatıon stages and histological investigation of ovary of the Zebrafish (Danio rerio)
Provedor de dados: 52
Autores: Koç (Yön),Nazan Deniz; Aytekin,Yener; Yüce,Rikap.
Microscopic ovary features of Zebrafish were analyzed. Samples were fixed in Bouin’s solution, mounted in parafin and cut into 6-7 µm-thick slices which were stained with Hematoxylin and Eosin (HE), methylene blue and using Periodic-acid Schiff method (PAS). The thin sections in ultramicrotome with the thickness of approximately 0,5 - 0,7 µm were examined by using Jeol electron microscope following contrasting with Uranyl Acetate-Lead Citrate. The zebrafish was an extremely dynamic organ in which follicles underwent asynchronous development. The oocytes of Zebrafish ovary were observed in various phases. The oocyte development of zebrafish was divided into four stages (primary growth, cortical alveolus, vitellogenic and mature oocyte). Oocyte diameters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zebrafish; Gonad; Oocyte; Development.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300010

Minor sperm abnormalities in young male post-pubertal patients with juvenile dermatomyositis
Provedor de dados: 56
Autores: Moraes,A.J.P.; Pereira,R.M.R.; Cocuzza,M.; Casemiro,R.; Saito,O.; Silva,C.A.A.
The objective of the present study was to identify sperm abnormalities in young male patients with juvenile dermatomyositis (JDM). In 2005, 18 male JDM patients, diagnosed according to the criteria of Bohan and Peter, were followed at the Pediatric Rheumatology Unit and Rheumatology Division, of our Institution. Of the 18 males, 11 were pre-pubertal and 7 were post-pubertal. Two of 7 post-pubertal JDM male patients were excluded: one for orchidopexy for cryptorchidism and the other for testicular ectopia in the left testis. The remaining 5 post-pubertal JDM patients were prospectively evaluated on the basis of two semen analyses, according to the World Health Organization (WHO), urologic evaluation, testicular Doppler ultrasound hormone profile. The data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Juvenile dermatomyositis; Gonad; Sperm; Hormone; Male post-puberty; Idiopathic inflammatory myopathy.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001200016