Consulta: subjectFacets:"Testes"
Registros recuperados: 22
Data/hora: 06/06/2024 01:25:50

Comportamento sexual do macho caprino da raça Moxotó às variações estacionais no Nordeste do Brasil.
Provedor de dados: 14
Autores: SILVA, A. E. D. F.; NUNES, J. F.
Resumo: Dez bodes da raca moxoto em idade de 24 a 26 meses foram submetidos durante dois anos a duas colheitas de ejaculados espermaticos semanais em vagina artificial. Os animais foram mantidos em pastagem nativa de caatinga raleada. Na avaliacao quantitativa do semen, encontrou-se maior volume na estacao chuvosa do que na seca. A concentracao de espermatozoides no ejaculado foi inversamente proporcional ao volume, portanto variando com as epocas do ano. Na estacao seca a porcentagem de espermatozoides vivos foi menor do que na estacao chuvosa. A patologia espermatica foi maior na estacao seca do que na chuvosa, porem essa patologia estava dentro do limite permitido(20-25%) para se obter uma taxa de fecundacao satisfatoria em qualquer das estacoes. Os...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Raça Moxotó; Efeito climático; Native breed; Macho; Sexual behaviour.; Reproductive behaviour; Caprino; Comportamento sexual; Sêmen; Testiculo; Eficiência reprodutiva.; Goats; Reproductive efficiency; Spermatozoa; Testes; Seasons.
Ano: 1988
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/514272

Mise en evidence de particules d'allure virale associees aux noyaux des cellules mesodermiques de la zone germinative testiculaire du crabe Rhithropanopeus harrisii (Gould) (Brachyoure, Xanthide).
Provedor de dados: 5
Autores: Payen, Geneviève G.; Bonami, Jean-robert.
Ultrastructural study of the testicular germinative zone in the crab R. harrisii has led to observation of virus-like particles exclusively located in the nuclei of mesodermal cells encompassing primary spermatogonia. These particles are related to the group of viruses of the herpes type.
Tipo: Text
Palavras-chave: Rhithropanopeus harrisii; Viruses; Testes; Viral diseases.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-1940.pdf

Histomorphometric Changes in the Testes and Epididymis of Wistar Strain Albino Rats Following Fourteen Days Oral Administration of Therapeutic Doses of Some Antibiotics
Provedor de dados: 77
Autores: Awobajo,F. O; Raji,Y; Akinloye,A. K.
Studies on testes and epididymis tissue of rats treated orally for fourteen days with therapeutic doses of cloxacillin (6mg/100g/day), ampicillin (4mg/100/day) and tetracycline (12mg/100g/day) separately showed a significant reduction in testicular and epididimis architecture. Microscopic studies of these male reproductive organs further revealed a significant alteration in the epididymis as revealed by a significant reduction (p&lt;0.05) in epididymal ductular diameter (EDD), and epididymal epithelial height (EEH) in treated group of animals. A significant increase (p&lt;0.05) was however recorded in epididymal luminal diameter (ELD) in all the animals after the two and three week's recovery period allowed. This gives another insight into the toxicity...
Tipo: Journal article
Palavras-chave: Antibiotics; Testes; Epididymis; Histomorphometry.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400047

Morphological Aspects of Spermatogenic Cells at Different Stages of Sexual Maturation in Black Isogenic C57BL/6/Uni Mice
Provedor de dados: 77
Autores: Martins,M. R. F. B; Silva,P. J. R; Martins,B. B; Zoca,S. M; Freitas,M. A; Batista,T. C.
In order to study the morphological changes that occur in cells of the testes of isogenic black mouse C57BL/6/Uni into three periods during spermatogenetic used 15 mice divided into 3 groups of 5 animals with 40, 50 and 60 days of age. The mice were sacrificed and weighed. Then weighed and measured the testicles, to be processed finalmete histologically and stained with HE, PAS and Masson Massom-H and evaluated under light microscopy. Was observed in group I with 40 days of age in the seminiferous tubules had a lumen with sparse small amount of interstitial tubular cells. In the seminiferous epithelium were identified type A spermatogonia, intermediate and B, which occupied the compartment adbasal and intermingled with these cells was observed in...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Mouse; Testes.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000100052

Stereological Evaluation of the Effects of Momordica charantia, antioxidants and Testosterone on Seminiferous Tubules of Rat
Provedor de dados: 77
Autores: Yama,Oshiozokhai Eboetse; Duru,Francis Ikechukwu; Oremosu,Ademola Ayodele; Noronha,Cressie Carmel; Okanlawon,Abayomi.
Ubiquitous consumption of Momordica charantia is hinged on credence of its potency in alleviating ailments. Almost no data exist on its quantitative relationship to the testes. The aim was to study the histomorphometric effect of Momordica charantia seed extract (MC), ascorbic acid (C), alpha-tocopherol (E) and testosterone (T) on the testes of rats. Ninety five mature 6-8 week-old male Sprague-Dawley (S-D) rats allotted randomly into six groups. Group I: fed MC for 16 weeks. Group II: administered MC for 8 weeks, later distilled water for another 8 weeks. Group III: administered C, E, T and a combination of all three test solutions (CET) for 8 weeks and later fed MC for another 8 weeks. Group IV: received MC initially for 8 weeks and later administered C,...
Tipo: Journal article
Palavras-chave: Histomorphometric; Momordica charantia; Sprague-Dawley; Testes.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000300068

Seasonal Variations in the Histometric Characteristics of the Reproductive Organs of Pubertal West African Dwarf Bucks in their Native Tropical Environment
Provedor de dados: 77
Autores: Bitto,I.I; Egbunike,G. N; Akusu,M. O.
As ambient temperature and humidity are high all year round within clearly defined dry and rainy seasons in our humid tropical environment, we evaluated the effects of season on the histometric characteristics of the reproductive organs of pubertal West African dwarf bucks using 8 healthy animals. There were no significant differences (p&gt;0.05) between the rainy and dry seasons in the basement membrane of the testes, seminiferous tubular diameter, and round spermatid nuclear diameter. There were also similarities (p&gt;0.05) between the seasons in epididymal luminal diameters, epididymal epithelial heights as well as in Leydig/sertoli cell ratio and sertoli cell Índex. Quadratic regression analyses showed that all the histometric characteristics of the...
Tipo: Journal article
Palavras-chave: Goats; Testes; Histometric; Seasons; Tropics; Farmers.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200024

Morphological Aspects of Spermatogenic Cells at Different Stagesof Sexual Maturation in Black Isogenic C57BL/6/Uni Mice
Provedor de dados: 77
Autores: Martins,M. R. F. B; Silva,P. J. R; Martins,B. B; Zoca,S. M; Freitas,M. A; Batista,T. C.
In order to study the morphological changes that occur in cells of the testes of isogenic black mouse C57BL/6/Uni into three periods during spermatogenetic used 15 mice divided into 3 groups of 5 animals with 40, 50 and 60 days of age. The mice were sacrificed and weighed. Testicles were weighed and measured, and histologically processed and stained with HE, PAS and Masson Massom-H and evaluated under light microscopy. It was observed that group I with 40 days of age in the seminiferous tubules had a lumen with sparse small amount of interstitial tubular cells. In the seminiferous epithelium type A spermatogonia, intermediate and B were identified, which occupied the compartment adbasal and intermingled with these cells in spermatocytes I in Pachytene and...
Tipo: Journal article
Palavras-chave: Spermatogenesis; Mouse; Testes.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200022

Histomorphometry of the Testes and Epididymis in the Domesticated Adult African Great Cane Rat (Thryonomys swinderianus)
Provedor de dados: 77
Autores: Olukole,S. G; Obayemi,T. E.
Histomorphometry of the testes and epididymis were carried out on the domesticated adult African great cane rat (Thryonomys swinderianus), also known as the grasscutter. The average weight and age of the cane rats used in the study were 1.93 ± 0.42 kg and 18.80 ± 1.39 months respectively. The mean relative volume of the germinal epithelium, interstitium and lumen of the seminiferous tubules of the cane rats were 68.54 ± 1.63%, 8.86 ± 0.85% and 21.40 ± 1.12% respectively. The mean diameter of the seminiferous tubules of the cane rats used for this study was 183.0 ± 11.06 µm. The ductal diameter of the caput, corpus and cauda epididymis were 207.4 ± 7.41 µm, 237.8 ± 10.15 µm and 274.2 ± 9.00 µm respectively, being statistically different (p&lt; 0.05). The...
Tipo: Journal article
Palavras-chave: Testes; Epididymis; Tubular diameter; Cane rat; Morphometry.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400042

Palliative Effect of Pausinystallia macroceras on Testicular Ischemic Reperfusion Injury in Wistar Rats: a Histological Study
Provedor de dados: 77
Autores: Ikebuaso,A. D; Yama,O. E; Amah,C. I; Oremosu,A. A; Duru,F. I. O; Oyebadejo,S. A; Noronha,C. C; Okanlawon,A. O; Mojekwu,T. O.
Testicular torsion is a disorder involving the scrotum that results in a compromise of its blood supply. The aim was to investigate the effect of Pausinystallia macroceras (PM) on testicular histology following torsion-detortion at different time intervals ranging from 1 to 4 hours 65 mature male Wister rats allotted randomly into seven groups (A to G; E&amp; F further divided into 4-subgroups). Each group/subgroup comprised 5 rats. Testis maintained in the torted position (T) for 1, 2, 3 and 4 hours in Groups A (AT1+PM), B (BT2+PM), C (CT3+PM) and D (DT4+PM). Group E subgroups (E1+PM, E2+PM, E3+PM, E4+PM -) were sham operated, without torsion served as the sham control. Group F subgroups (F1T1, F2T2, F3T3 and F4T4) were torted as in A. All animals (except...
Tipo: Journal article
Palavras-chave: Pausinystallia macroceras; Torsion-Detortion; Wister rats; Testes.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400031

Postnatal Developmental Anatomy of Testes and Epididymis of Gaddi Goats
Provedor de dados: 77
Autores: Pathak,Archana; Katiyar,R. S; Sharma,D. N; Farooqui,M. M.
The study revealed that the testes of one-day-old Gaddi goats have descended in the scrotum along with adnexa. They were elongated compressed latero-medially and became ovoid during their postnatal growth and morphogenesis. The two testes were not different significantly in their weight and measurement. The average weight which was about 2.9 gm at birth grew to 107 gm (40X) in pubertal animals and nearly maintained it during the post-puberty (113 g). The mean length (1.46 cm), width (0.85 cm) and thickness (0.62 cm) also grew by 47, 60, and 83 times, respectively. In post-pubertal animals it measured 7.06 x 5.20 x 5.10 cm. The study indicated a very fast growth of the testes from birth to puberty, which did not alter significantly after that. A relatively...
Tipo: Journal article
Palavras-chave: Postnatal developmental; Anatomy; Testes; Epididymis; Gaddi goats.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400043

Gonadal Development of Peprilus medius (Peters, 1869) (Perciformes: Stromateidae) from Southeast of the Gulf of California, Mexico
Provedor de dados: 77
Autores: Maldonado-Amparo,Maria de los Angeles; Sánchez-Cárdenas,Rebeca; Salcido-Guevara,Luis Antonio; Ramírez-Pérez,Jorge Saúl.
The gonadal development assessment is a fundamental work in researching the reproduction of Peprilus medius, on the way to understand its population dynamics and to achieve a sustainable management of its fisheries. The diagnosis based on morphochromatic features is the quicker, more practical and cheaper method, and properly validated, it may be an accurate procedure. This is particularly useful in researches when it is required to provide prompt and accurate information to support decision-making for fisheries management, and during long-term fisheries monitoring to detect changes in reproductive patterns due to environmental anomalies. These are issues of concern in P. medius and other fishery resources. In this context, a scale that describes the...
Tipo: Journal article
Palavras-chave: Ovaries; Testes; Gametogenesis; Reproductive anatomy.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100011

Morphology of male reproductive system in three species of Trypoxylon (Trypargilum) Richards (Hymenoptera: Crabronidae)
Provedor de dados: 82
Autores: Moreira,Polyana A.; Araújo,Vinícius A.; Zama,Uyrá; Lino-Neto,José.
Variations in the adult male reproductive system among different groups of Hymenoptera offer characteristics that help studies on behavior and phylogenetics. The objective of this study was to describe the adult male reproductive system of three Trypoxylon (Trypargilum) species. For that, tissues were disseced, fixed in 2.5% glutaraldehyde in 0.1 M sodium cacodylate buffer, pH 7.2 and postfixed in 1% osmium tetroxide. The material was dehydratated and embedded for light and electron transmission microscopes. The species have similar reproductive systems, which are formed by a pair of testes, each one with three fusiforme follicles, from which emerges an efferent duct that later joins forming a deferent duct. The deferent duct opens into an ejaculatory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Histology; Testes; Spheciform wasp.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000400012

Reproductive cycle of the Neotropical cichlid yellow peacock bass Cichla kelberi: A novel pattern of testicular development
Provedor de dados: 83
Autores: Siqueira-Silva,Diógenes Henrique de; Vicentini,Carlos Alberto; Ninhaus-Silveira,Alexandre; Veríssimo-Silveira,Rosicleire.
The present study describes the testicular maturation phases (associating the germ cells development and the morphological changes suffered by the germinal epithelium along the whole year), and the testicular morphology in the yellow peacock bass Cichla kelberi, relating it to other species. For this purpose, 78 specimens were studied according conventional techniques of light microscope. The testes in C. kelberi were classified as unrestricted spermatogonial lobular, an apomorphic characteristic in the recent groups of Teleost. Furthermore, were defined five testicular maturation phases: Preparatory phase; Early Germinal Epithelium Development; Mid Germinal Epithelium Development; Late Germinal Epithelium Development and; Regression. Similar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germinal epithelium; Gonadal maturation; Reproductive phases; Spermatogenesis; Testes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300587

Observaciones sobre el ciclo reproductivo del mero, Acanthistius brasilianus (Serranidae, Pisces)
Provedor de dados: 20
Autores: Dell'Arciprete, O.P.; Christiansen, H.E.; Diaz de Astarloa, J.M.
The present paper deals with the study of the reproductive cycle of the sea-bass (Acanthistius brasilianus). Its main objective is getting some advance in the inderstanding of the gonad cycle of the sea-bass and the comprehension of its mode of reproduction. The study is emphasized on tahe females because it is thought that they permit a better analysis in this first stage of the reseach work. Some basic aspects, such as the anatomical and the histological description of the gonadas, the study of ovocyte maturation phases and the development of ovary maturity scales were into account. The gonad cycle was analized throughout the year by means of different approaches; histological analysis of ovary preparation and by following the statistical structure of...
Tipo: Journal Contribution
Palavras-chave: Sexual maturity; Reproductive cycle; Reproduction; Ovaries; Testes; Ovaries; Sexual maturity; Reproduction; Testes; Http://aims.fao.org/aos/agrovoc/c_5456; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_7682.
Ano: 1987
URL: http://hdl.handle.net/1834/2004

Effect of an Organic Trace Mineral Premix on the Semen Quality, Testicular Morphology and Gene Expression Related to Testosterone Synthesis of Male Broiler Breeders
Provedor de dados: 89
Autores: Shan,T; Dai,P; Zhu,P; Chen,L; Wu,W; Li,Y; Li,C.
ABSTRACT In order to investigate the effect of organic trace minerals premix (OTM) on the reproductive performance of breeder roosters, a total of 240 San Huang roosters (23 weeks of age) were randomly divided into two treatments with six replicates of 20 roosters each. The first group (n = 120) was fed a basal diet containing an inorganic trace minerals premix (ITM) and the other group (n = 120) was fed the basal diet in which ITM was replaced by OTM. The experiment period was 22 weeks. Semen from one randomly-selected rooster per replicate was collected two weeks after the beginning of the experiment and other 10 times every two weeks. Another rooster per replicate was randomly selected at 30, 35, and 45 weeks of age, and sacrificed. Results showed that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic trace minerals; San Huang roosters; Semen; Testes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2017000300481

Mudanças morfológicas dos testículos de curimbatá Prochilodus scrofa (Steindachner) (teleostei, prochilodontidae), submetido à indução hormonal
Provedor de dados: 104
Autores: Kavamoto,Emico Tahira; Narahara,Massuka Yamane; Andrade-Talmelli,Elaine Fender de.
This Study Concerns the morphological changes of the testes of "curimbatá", Prochilodus scrofa (Steindachner, 1881) at the beginning of sperm production, before and after the hormonal injections. We examined 25 three year old males that were reared in tanks at the Experimental Fish and Frog Culturing Station of Pindamonhangaba of the Fisheries Institute of São Paulo. The testes were sampled at the start of sperm production, after the first hormone injection (5 IU/g for weight of hCG), and 14 days before and after a second injection. Testicle fragments of these specimens were fixed and embedded in historesin. At the beginning of sperm production, the milky-white gonad showed consistem superficial vascularization, exceeding thick sperm under light pressure....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prochilodus scrofa; Fish; Testes; Morphology; Hormonal stimulation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000100008

Evaluation of quantitative parameters of Leydig cell in diabetic adults rats
Provedor de dados: 3
Autores: Silva, Alluanan Adelson do Nascimento; Oliveira, Jessica Santana de; Oliveira, Rodrigo Ribeiro de; Moraes, Sílvia Regina Arruda de; Silva Júnior, Valdemiro Amaro da; Melo, Elizabeth Neves de.
The goal of present study was to evaluate the effects of diabetes on quantitative parameters of Leydig cells. Twelve adults Wistar rats were divided in: 1) Diabetic Group (DG), which was induced by a single intraperitoneal injection of streptozotocin (60 mg kg-1 of body weight); and 2) Control Group (CG), which received citrate buffer intraperitoneal. After eight weeks of diabetic induction, the animals were weighted, anesthetized and testicles were removed and routinely processed to paraffin embedded. Body weight (40%) and testicular weight (18%) of diabetic rats were significantly lower than control group.  Diabetic rats showed an increase in interstitial compartment but the tubular compartment did not differ. The individual volume of Leydig cells and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.00.00.00-6; 2.06.00.00-3 streptozotocin; Testes; Interstitial cells; Morphometry Morfofisiologia Animal.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/22455

Anatomy of the male reproductive system of Phrynops geoffroanus (Testudines: Chelidae) - doi: 10.4025/actascibiolsci.v33i4.8091
Provedor de dados: 3
Autores: Cabral, Silvia Rosana Pagliarini; UNESP - IBILCE; Santos, Lia Raquel de Souza; UNESP - IBILCE; Franco-Belussi, Lilian; UNESP - IBILCE; Zieri, Rodrigo; UNESP - IBILCE; Zago, Carlos Eduardo Saranz; UNESP - IBILCE; Oliveira, Classius de; UNESP - IBILCE.
The reproductive system of male Phrynops geoffroanus adults is macroscopically described and the variation in testicular biometry is evaluated. A pair of oval testes is connected by the efferent ductules to the epididymis, which continue as deferent ducts, which emerge in the penis. The volume of the gonads showed the highest averages during spring and summer months. GSI varied significantly throughout the year, with the highest averages observed in the months that correspond to the end of spring and the beginning of summer, when the reproduction of the species takes place, and the lowest averages were seen in winter, suggesting a cyclical testicular activity.
Palavras-chave: 2.04.00.00-4; 2.06.04.02-5 Testudines; Phrynops geoffroanus; Reproductive system; Testes; Epididymis; Efferent ductules; Deferent ducts; Penis Anatomia Animal Testudines; Phrynops geoffroanus; Reproductive system; Testes; Epididymis; Efferent ductules; Deferent ducts; Penis.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/8091

Effects of the food contaminant semicarbazide on testicular morphology of juvenile Wistar rats
Provedor de dados: 45
Autores: Ramos,A; Pereira,A.; Cabrita,A.S; Silva,F. Capela e.
O objectivo do presente trabalho foi avaliar os efeitos da semicarbazida na morfologia testicular de ratos Wistar jovens. Os animais foram tratados durante 30 dias com hidrocloreto de semicarbazida incorporado na dieta, nas concentrações de 0, 3 e 6g/kg. Os resultados obtidos revelaram uma diminuição estatisticamente significativa no diâmetro dos túbulos seminíferos, no diâmetro do lúmen dos túbulos seminíferos e na área ocupada pelo epitélio seminífero nos animais dos grupos experimentais em comparação com os animais do grupo controlo. Estes resultados evidenciam que a semicarbazida induz alterações importantes no desenvolvimento testicular e sugerem um estudo mais aprofundado sobre os mecanismos de acção, dos efeitos a longo prazo, da reversibilidade das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Semicarbazida; Rato; Wistar; Testículos; Semicarbazide; Rat; Wistar; Testes.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352012000300037

Protective Effect of Rosa Canina Extract Against Doxorubicin-induced Testicular Toxicity in Mice
Provedor de dados: 52
Autores: Nowrouzi,Fatemeh; Azadbakht,Mehri; Kalehoei,Eshrat; Modarresi,Masoud.
Abstract The present study was aimed to investigate the in vivo effects of Rosa canina extract on doxorubicin-induced testicular toxicity in mice for the first time. Male NMRI mice were randomly divided into six treatment groups (10=per group) as follows: (I) vehicles, (II) doxorubicin alone (3 mg/kg, i.p. on days 7, 14 and 21), (III and IV): Rosa canina extract alone (100 mg/kg and 200 mg/kg per day, i.p. for 28 days), (V and VI) Rosa canina extract plus doxorubicin (each dose given 1 h post Rosa canina). Doxorubicin-treated mice displayed smaller body and testicular weights, decreased serum levels of testosterone, loss in the number of germ cells and Sertoli cells, and reduced sperm count, viability, morphology and motility. Doxorubicin treatment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rosa canina extract; Doxorubicin; Testes; Sperm; Mice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100403

Changes in the thyroid gland during the reproductive cycle of the male vespertilionid bat, Scotophilus heathi
Provedor de dados: 57
Autores: KRISHNA,A.; SINGH,K.
The aim of present study was to compare the changes in thyroid gland with the reproductive cycle of S. heathi. Thyroid showed marked seasonal variation in weight, quantity of colloid and follicular epithelial height, suggesting the thyroid gland to be inactive during quiescence and winter dormancy and active during the time of recrudescence and breeding similarly to the testicular cycle. Plasma thyroxin (T4) concentration showed a significant seasonal change with high concentration during breeding and post-breeding and low concentration during quiescence. However, the T4 concentration increased from breeding to post-breeding phase, when the testes weight was declining. It is suggested that in S. heathi the positive correlation between thyroid and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thyroid; Thyroxin; Testes; Bat; Body weight; Reproduction.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400018

Effect of melatonin and time of administration on irradiation-induced damage to rat testes
Provedor de dados: 56
Autores: Take,G.; Erdogan,D.; Helvacioglu,F.; Göktas,G.; Ozbey,G.; Uluoglu,C.; Yücel,B.; Guney,Y.; Hicsonmez,A.; Ozkan,S.
The effect of ionizing irradiation on testes and the protective effects of melatonin were investigated by immunohistochemical and electron microscopic methods. Eighty-two adult male Wistar rats were divided into 10 groups. The rats in the irradiated groups were exposed to a sublethal irradiation dose of 8 Gy, either to the total body or abdominopelvic region using a 60Co source at a focus of 80 cm away from the skin in the morning or evening together with vehicle (20% ethanol) or melatonin administered 24 h before (10 mg/kg), immediately before (20 mg/kg) and 24 h after irradiation (10 mg/kg), all ip. Caspace-3 immunoreactivity was increased in the irradiated group compared to control (P &lt; 0.05). Melatonin-treated groups showed less apoptosis as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Testes; Gamma-irradiation; Melatonin; Immunohistochemistry; Electron microscopy.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009000700006