Estela M. Mu�oz, Teresa Fogal, Susana Domínguez, Luis Scardapane, Ram�n S. Piezzi,
... morphometric study of the sertoli cell of the viscacha (Lagostomus maximus maximus) during the annual reproductive cycle ... linkShare onFacebookTwitterLinkedInRedditWechat Abstract Changes in the morphology of viscacha Sertoli cells were studied during the annual reproductive ... degree of regression and recovery exhibited by the viscacha Sertoli cells was closely related to that shown ... of the morphological and functional characteristics of the viscacha Sertoli cells. These hormonal fluctuations are synchronized by ...
Tópico(s): Bee Products Chemical Analysis
2001 - Wiley | The Anatomical Record
Lyn C. Branch, D. Villarreal, Gene S. Fowler,
Population dynamics of the plains viscacha (Lagostomus maximus), a highly social burrowing rodent, were studied in desert scrub habitat of central Argentina from 1984 to 1991. The viscacha population declined between 1984 and 1987 from 96 ... study. However, observations of mountain lions foraging in viscacha colonies increased during the decline of the viscacha population. Predation rates may have increased because viscachas ... poor body condition. Following the decline in the viscacha population and after a slight increase in rainfall, ...
Tópico(s): Evolution and Paleontology Studies
1994 - Wiley | Journal of Zoology
Luis A. Ebensperger, Raúl Sobrero, Valeria E. Campos, Stella M. Giannoni,
... the extent of sociality of the scarcely known viscacha rats, Octomys mimax. Seven individuals were live trapped and fitted with radio-collars. Viscacha rat activity, as measured from distance moved between ... or more radio-collared animals was never recorded. Viscacha rats showed relatively large range areas and low- ... overlap with neighbors was similar. Results suggest that viscacha rats are solitary living animals. This study supported ...
Tópico(s): Animal Behavior and Reproduction
2008 - Elsevier BV | Journal of Arid Environments
Claudia Aguilera Merlo, Estela M. Muñoz, Susana Domínguez, MABEL F覵COLO, Luis Scardapane, Juan C. de Rosas,
... in the reproductive activity of the adult male viscacha (Lagostomus maximus maximus) were investigated during the annual ... gametes were used to evaluate the ability of viscacha spermatozoa to achieve primary binding during its annual ... tails. These results suggest that the ability of viscacha spermatozoa to participate in gamete recognition is profoundly ... epididymal microenvironment during the annual reproductive cycle of viscacha.
Tópico(s): Insect and Pesticide Research
2005 - | Biocell
Claudia Aguilera‐Merlo, Teresa Fogal, Tirso Sator, Susana Domínguez, Miguel A. Sosa, Luis Scardapane, Ramón Piezzi,
... rodents is synchronized primarily by the photoperiod. The viscacha, a South American rodent of nocturnal habits and ... the active period. These results demonstrate that the viscacha epididymis exhibits significant ultrastructural and biochemical changes during ... We demonstrate that during regression, melatonin secretion in viscacha increases. This study shows that the epididymal epithelium ...
Tópico(s): Animal Ecology and Behavior Studies
2009 - Wiley | Journal of Morphology
Claudia Aguilera‐Merlo, Estela M. Muñoz, Susana Domínguez, Luis Scardapane, Ramón Piezzi,
... photoperiod or their influence on sperm maturation. The viscacha is a seasonal rodent living in the Southern ... dense bodies. In conclusion, the epididymis of the viscacha exhibits important seasonal morphological changes throughout annual reproductive ... therefore postulate that the epididymal morphology of the viscacha probably could be regulated by the natural photoperiod. © ...
Tópico(s): Hormonal and reproductive studies
2004 - Wiley | The Anatomical Record Part A Discoveries in Molecular Cellular and Evolutionary Biology
Valeria E. Campos, Gabriel Gatica, Laura M. Bellis,
... potential tool for modeling habitat suitability of the viscacha rat (Octomys mimax), a rock-dwelling species that ... on locations used by and available for the viscacha rat. The habitat preferences identified in our models ... of field studies of landscape use by the viscacha rat. Rocky habitats were well differentiated by the ...
Tópico(s): Animal Ecology and Behavior Studies
2015 - Springer Science+Business Media | Mammal Research
Maximiliano Chaves, Claudia Aguilera‐Merlo, Albana Cruceño, Teresa Fogal, Fabián Mohamed,
The viscacha (Lagostomus maximus maximus) is a rodent with photoperiod-dependent seasonal reproduction. The aim of this work was ... Our results suggest a reduced secretory activity of viscacha prostate during the period of minimal reproductive activity. ... both the central and peripheral zones of the viscacha prostate agree with the results previously obtained in ...
Tópico(s): Veterinary Medicine and Surgery
2015 - Wiley | The Anatomical Record
Estela M. Muñoz, Teresa Fogal, Susana Domínguez, Luis Scardapane, Jorge A. Guzmán, Juan C. Cavicchia, Ramón Piezzi,
The adult male viscacha (Lagostomus maximus maximus) is a seasonal rodent. It exhibits a short period of testicular regression with partial arrest of ... present study provides the first description of the viscacha spermatogenic cycle during the period of maximum gonadal ... under the light microscope. Sperm release from the viscacha seminiferous epithelium occurs either in late stage III ...
Tópico(s): Hormonal and reproductive studies
1998 - Wiley | The Anatomical Record
Mirta Alicia Flamini, Cláudio Gustavo Barbeito, Enrique Leo Portiansky,
Abstract The plains viscacha is a hystricognathi rodent with special reproductive characteristics. Despite poly‐ovulation of 800 oocytes, it generates a high embryonic ... and uterine cervix of pregnant and non‐pregnant viscacha. Anatomically, the uterus has two horns each one ... glands varies according to the physiological state. In viscacha, there is no uterine body and cervices cannot ...
Tópico(s): Reproductive System and Pregnancy
2019 - Wiley | Acta Zoologica
Claudia Patricia Calderón, Fabián Mohamed, Estela M. Muñoz, Teresa Fogal, Lilian Pelzer, Alicia Penissi, Ramón Piezzi,
... rhythmic daily changes in the retina of the viscacha, we considered it important to study the likely ... binding sites. Therefore, in the retina of the viscacha, we suggest that the interaction between melatonin and ... regulation of the daily morphological changes observed in viscacha. Anat Rec 266:198–206, 2002. © 2002 Wiley‐ ...
Tópico(s): Retinal Development and Disorders
2002 - Wiley | The Anatomical Record
... live female of the Patagonian species of Mountain viscacha (Lagidium boxi). The study is reported because it shows that L. boxi, like the Peruvian Mountain viscacha (JL. peruanum), appears to ovulate only from the ...
Tópico(s): Evolution and Paleontology Studies
1971 - Wiley | Journal of Zoology
R. B. Heap, N Ackland, B. J. WEIR,
... of guinea-pigs, casiragua, cuis, degu and plains viscacha. During pregnancy PBPP increased to reach peak values ... and in mid-gestation in cuis, degu and viscacha. The pattern of PBPP concentration during pregnancy was ... denaturing conditions were similar in cuis, degu and viscacha and close to PBG I of guinea-pigs, ...
Tópico(s): Neuropeptides and Animal Physiology
1981 - Bioscientifica | Reproduction
D Heath, David R. Williams, P. Harris, Patrick F. Smith, H Krüger, A Ramirez,
... living in a state of chronic hypoxia the viscacha has a thin-walled pulmonary vasculature in contrast ... course of evolution at high altitude the mountain-viscacha has lost the property of pulmonary vasoconstriction, finding ...
Tópico(s): High Altitude and Hypoxia
1981 - Elsevier BV | Journal of Comparative Pathology
Karim J. Ledesma, Florian Werner, Ángel E. Spotorno, Luis Albuja,
A new species of mountain viscacha, Lagidium ahuacaense, is described based on a specimen and a mitochondrial cytochrome b (cyt b) sequence obtained from a second individual ... height). The cyt b sequence of the Ecuadorean viscacha differed by 14 exclusive nucleotide substitutions from all ...
Tópico(s): Amphibian and Reptile Biology
2009 - Q15088586 | Zootaxa
Verónica Filippa, Fabián Mohamed,
Abstract Lactotrophs in pituitary pars distalis (PD) of viscacha were studied by immunohistochemistry and morphometric analysis in ... Our results showed that in the adult male viscacha, lactotrophs vary seasonally, probably due to the photoperiod ...
Tópico(s): Hormonal and reproductive studies
2009 - Wiley | The Anatomical Record
Verónica Filippa, Fabián Mohamed,
Abstract The physiology and behavior of viscacha vary along the year according to the modifications of environmental signals such as the photoperiod length, temperature, rainfall pattern, food composition, and ... pituitary pars distalis thyrotrophs (TSH cells) of male viscacha were immunohistochemically identified, and the morphometric parameters: percentage ...
Tópico(s): Animal Nutrition and Physiology
2008 - Wiley | The Anatomical Record
E. M. Chaves, Claudia Aguilera‐Merlo, Verónica Filippa, Fabián Mohamed, S Domínguez, Luis Scardapane,
... and coagulant gland (CG) were studied in male viscacha, a seasonally reproductive wild rodent. Two histologically well- ... Finally, the reproductive system accessory glands of male viscacha may be considered as a novel and interesting ...
Tópico(s): Reproductive Physiology in Livestock
2010 - Wiley | Anatomia Histologia Embryologia
Mariano Acosta, Verónica Filippa, Fabián Mohamed,
... the pituitary pars distalis FSC in adult male viscacha and to analyze their relation with hormone secreting ... the pituitary pars distalis paracrine regulation of the viscacha.
Tópico(s): Bone Metabolism and Diseases
2010 - PAGEPress (Italy) | European Journal of Histochemistry
Mariano Acosta, Fabián Mohamed,
... cell types in the pituitary pars distalis. The viscacha (Lagostomus maximus maximus) is a rodent with photoperiod- ... the folliculostellate cells in pituitary pars distalis of viscacha. Immunohistochemistry and image analysis were used to measure ...
Tópico(s): Estrogen and related hormone effects
2010 - Elsevier BV | Acta Histochemica
Verónica Filippa, Fabián Mohamed,
... identified in the pituitary pars distalis (PD) of viscacha by using the polyclonal antiserum against ACTH (1– ... caused by pregnancy. Our results in adult male viscacha demonstrate that the morphology of the ACTH cells ...
Tópico(s): Adipose Tissue and Metabolism
2006 - Elsevier BV | General and Comparative Endocrinology
E. M. Chaves, Claudia Aguilera‐Merlo, Albana Cruceño, Teresa Fogal, Ramón Piezzi, Luis Scardapane, Susana Domínguez,
Abstract The viscacha is a seasonal rodent that exhibit an annual reproductive cycle with periods of maximum reproductive activity and gonadal ... the SVs changes in the activity period of viscacha, probably because of elevated levels of testosterone leading ...
Tópico(s): Sexual Differentiation and Disorders
2012 - Wiley | The Anatomical Record
Antoni Ribes, Fabián Mohamed, S Domínguez, Marcela Sánchez Delgado, Luis Scardapane, Jorge A. Guzmán, Ramón Piezzi,
... in the present study was Lagostomus maximus maximus (viscacha). The reproduction of males of this species is ... the reticularis. The short winter photoperiod to which viscacha is subjected could inhibit the adrenal cortex through ...
Tópico(s): Pharmacological Effects and Assays
1999 - Associação Brasileira de Divulgação Científica | Brazilian Journal of Medical and Biological Research
Fabricio Iván Busolini, Graciela Rodríguez, Verónica Filippa, Fabián Mohamed,
... ultrastructural studies of the pineal gland of female viscacha ( Lagostomus maximus maximus ) were performed to analyze the ... may indicate that the pineal gland of female viscacha is susceptible to endocrine variations during pregnancy.
Tópico(s): Skin Protection and Aging
2017 - Hindawi Publishing Corporation | International Journal of Endocrinology
Produção Nacional
Revisado por pares
F. F. S. Maia, B. Dias, J. F. C. Santos, L. O. Kerber, E. Bica, Andrés E. Piatti, B. Barbuy, Bruno Quint, L. Fraga, David Sanmartim, M S Angelo, J. A. Hernández-Jiménez, O. J. Katime Santrich, R. A. P. Oliveira, Ángeles Pérez-Villegas, S. O. Souza, R. G. Vieira, P. Westera,
The VISCACHA (VIsible Soar photometry of star Clusters in tApii and Coxi HuguA) Survey is an ongoing project based ... systems. In this first paper we present the VISCACHA Survey and its initial results, concerning the SMC ...
Tópico(s): Astronomy and Astrophysical Research
2019 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
Francisco Acuña, Cláudio Gustavo Barbeito, Enrique Leo Portiansky, Guadalupe Ranea, María Angélica Miglino, Mirta Alicia Flamini,
... different taxa. However, in the hystricomorphic rodent plains viscacha (Lagostomus maximus) is exceptional in terms of massiveness ( ... and sectorization of embryonic death in the plains viscacha make the species a unique model for the ...
Tópico(s): Wildlife Ecology and Conservation
2022 - Elsevier BV | Theriogenology
Lucı́a Fuentes, Estela M. Muñoz, Claudia Aguilera Merlo, Susana Domínguez, Luis Scardapane, Ramón Piezzi,
The viscacha (Lagostomus maximus maximus) is a seasonal rodent living in the Southern Hemisphere. The adult males exhibit an ... changes might be involved. Bilateral enucleation in the viscacha dampened and extended the period of its annual ... maintain the reproductive cycle amplitude and timing in viscacha.
Tópico(s): Insect and Pesticide Research
2004 - University of Chicago Press | Physiological and Biochemical Zoology
Mirta Alicia Flamini, Cláudio Gustavo Barbeito, Alcira Ofélia Díaz, Enrique Leo Portiansky,
... in all the studied females of the plains viscacha (Lagostomus maximus). The goal of the present study ... gland between adult pregnant and non-pregnant plains viscacha using histochemical, lectin-histochemical and immunohistochemical techniques, as ...
Tópico(s): Wildlife Ecology and Conservation
2020 - Elsevier BV | Tissue and Cell
VALERIA E CAMPOS, Natalia Andino, Flavio M. Cappa, María L. Reus, Stella M. Giannoni,
The viscacha rat (Octomys mimax; Rodentia, Octodontidae) belongs to a monotypic genus endemic to western Argentina and inhabits lowland ... rock color) that infl uence selection by the viscacha rat; 2) to compare the range and variance ... different depths (0, 30 and 50 cm).The viscacha rat did not use microhabitats in proportion to ... insulating effect of rocks might benefi t the viscacha rat by providing a thermally stable environment, especially ...
Tópico(s): Wildlife Ecology and Conservation
2013 - BioMed Central | Revista chilena de historia natural
S. Yasmin Bobadilla, María Ana Dacar, Fabián M. Jaksić, Ricardo A. Ojeda, M. Fernanda Cuevas,
... europaeus), goat (Capra hircus), and the native plains viscacha (Lagostomus maximus) to compare the utilization of spatial ... goats were more generalist than rabbits and plains viscacha in the utilization of different habitat types. Native ... of resource limitation (dry season), the native plains viscacha differed in feeding strategy from the non-native ...
Tópico(s): Animal Behavior and Welfare Studies
2021 - Oxford University Press | Journal of Mammalogy