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Navegando por Assunto "Morfometria"

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    Ensaios estereológicos e morfologia tridimensional na formação hipocampal de aves migratórias marinhas: análise quantitativa da imunomarcação seletiva de neurônios e micróglia em Calidris pusilla e Actitis macularia
    (Universidade Federal do Pará, 2013-08-14) DINIZ, Cristovam Guerreiro; SHERRY, David Francis; DINIZ, Cristovam Wanderley Picanço; http://lattes.cnpq.br/2014918752636286
    The aim of this report is to describe the hippocampal formation of two migratory birds, Calidris pusilla and Actitis macularia, that leave the cold regions of the Canadian Tundra, escaping the winter, towards the coast of South America and the Caribbean Islands where they remain until winter ends returning to the Northern hemisphere. We intend to describe the qualitative and quantitative morphological organization of the hippocampal formation, using cytoarchitetonics with cresyl violet and immunostaining for neurons and microglia, followed by stereological estimates of the total number of cells identified with selective markers. We intend as well to compare the three-dimensional morphology of hippocampal microglia of these species with those of the dentate gyrus of Wistar rats and Capuchin monkey. The shorebirds used in the characterization were captured in Canela Island, Bragança City, State of Pará, Brazil (0°47'21.95"S and 46°43'7.34"W), as well as in Canada, in the Bay of Fundy, near Johnson's Mills, New Brunswick (45° 50' 19.3" N 64° 31' 5.39" W). The hippocampal formation limits definition was performed employing Nissl staining and immunostaining for NeuN. For the objects of interest definition of stereological estimates and three-dimensional reconstructions we used immunostaining with anti NeuN for neurons and anti-IBA-1 for microglia respectively. The stereological results revealed similar number of neurons in both species whereas the number of microglia in Actitis macularia was 37% higher than in Calidris pusilla. Furthermore, it was found that the hipocampal formation average volume in Actitis macularia was 38% higher than that found in Calidris pusilla. Comparative studies of the microglial morphology with mammals (Rattus novergicus and Cebus apella) revealed significant morphological differences that indicate microglia in birds shows on average lower complexity (smaller fractal dimension), smaller tree volumes and areas and thinner branches than rat and monkey microglia.
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    Hematological and morphometric differences of blood cells from rheas, Rhea americana (Struthioniformes: Rheidae) on two conservation farms
    (Universidade Federal do Pará, 2017-01) GALLO, Samira Salim Mello; EDERLI, Nicole Brand; OLIVEIRA, Francisco Carlos Rodrigues de
    Today, blood tests are an indispensable tool in avian medicine. This study aimed to describe and compare hematological and morphometric data of erythrocytes, leukocytes and thrombocytes of rhea, Rhea americana. To do so, 58 rheas of both sexes on two farms, one in Cachoeiro do Itapemirim, Espírito Santo (ES), and the other in São Carlos, São Paulo (SP), were selected. Blood samples were taken and their RBC counts, PCV and Hb levels were determined and used in hematimetric index calculations. The total and differentiated leukocyte counts and the TPP and fibrinogen serum levels were also obtained. The results from the two farms analyzed were compared by means of the t test. There were differences in the parameters of the erythrocyte series between the two flocks because of a process of hypochromic macrocytic anemia observed among the rheas in ES. The values for the erythrocyte series and indexes were: RBC, 2.81 ± 0.15 x106/μl; PCV, 44.20 ± 2.86%; Hb, 12.12 ± 0.74 g/dL; MCV, 15.75 ± 0.89 fL; MCH, 43.18 ± 1.82 pg; and MCHC, 27.44 ± 0.80 g/dL. The values for the leukocyte series were: WBC, 12,072 ± 4116 /μL; heterophils, 64.10 ± 9.90%; eosinophils, 2.05 ± 2.06%; monocytes, 6.40 ± 2.99%; lymphocytes, 26.93 ± 9.62%; and basophils, 0.52 ± 1.27%. These can all be suggested as references for rheas reared in Brazil. Statistical differences were observed in erythrocyte length measurements, which were higher in the rheas in SP than in those in ES. Regarding width, the heterophils, lymphocytes and monocytes of the birds in ES were statistically greater than those of the birds in SP. It was concluded that rheas may exhibit morphometric alterations to blood cells and differences in blood elements according to the type of management to which they are subjected.
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    Horizontal projections of area 17 in Cebus monkeys: metric features, and modular and laminar distribution
    (1997-12) AMORIM, Ana Karla Jansen de; DINIZ, Cristovam Wanderley Picanço
    Metric features and modular and laminar distributions of intrinsic projections of area 17 were studied in Cebus apella. Anterogradely and retrogradely labeled cell appendages were obtained using both saturated pellets and iontophoretic injections of biocytin into the operculum. Laminar and modular distributions of the labeled processes were analyzed using Nissl counterstaining, and/or cytochrome oxidase and/or NADPH-diaphorase histochemistry. We distinguished three labeled cell types: pyramidal, star pyramidal and stellate cells located in supragranular cortical layers (principally in layers IIIa, IIIb α, IIIb ß and IIIc). Three distinct axon terminal morphologies were found, i.e., Ia, Ib and II located in granular and supragranular layers. Both complete and partial segregation of group I axon terminals relative to the limits of the blobs of V1 were found. The results are compatible with recent evidence of incomplete segregation of visual information flow in V1 of Old and New World primates.
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    Kudoa spp. (Myxozoa, Multivalvulida) parasitizing fish caught in Aracaju, Sergipe, Brazil
    (Universidade Federal do Pará, 2016-12) EIRAS, Jorge Costa; FUJIMOTO, Rodrigo Yudi; MADI, Rubens Riscala; JERALDO, Veronica de Lourdes Sierpe; MELO, Cláudia Moura de; SOUZA, Jônatas dos Santos de; DINIZ, José Antonio Picanço; DINIZ, Daniel Guerreiro
    This study reports on Kudoa spp. (Myxozoa, Multivalvulida) from the fish species Lutjanus analis, Bagre marinus, Aspistor luniscutis and Lutjanus jocu, which were caught in Aracaju, state of Sergipe, Brazil. The parasites formed oval plasmodia around the esophagus of L. analis, and elongated plasmodia inside the skeletal muscle of B. marinus, A. luniscutis and L. jocu. Host myoliquefaction was not observed in all the cases studied. The current study provides a morphological and morphometric description of each parasite as well as a comparison with all the species described worldwide. Lack of molecular data impaired specific identification of the parasites. The importance of these parasites is discussed and the need for further studies on infections in Brazilian fish is emphasized because of the high economic impact of some Kudoa species which cause liquefaction in hosts’ muscles and render these fish unsuitable for consumption.
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    Microglia and neurons in the hippocampus of migratory sandpipers
    (Universidade Federal do Pará, 2015-11) DINIZ, Cristovam Guerreiro; MAGALHÃES, Nara Gyzely de Morais; SOUSA, Aline Andrade de; SANTOS FILHO, Carlos; DINIZ, Daniel Guerreiro; LIMA, Camila Mendes de; OLIVEIRA, Marcus Augusto de; PAULO, Dario Carvalho; PEREIRA, Patrick Douglas Corrêa; SHERRY, David Francis
    The semipalmated sandpiper Calidris pusilla and the spotted sandpiper Actitis macularia are long- and short-distance migrants, respectively. C. pusilla breeds in the sub-arctic and mid-arctic tundra of Canada and Alaska and winters on the north and east coasts of South America. A. macularia breeds in a broad distribution across most of North America from the treeline to the southern United States. It winters in the southern United States, and Central and South America. The autumn migration route of C. pusilla includes a non-stop flight over the Atlantic Ocean, whereas autumn route of A. macularia is largely over land. Because of this difference in their migratory paths and the visuo-spatial recognition tasks involved, we hypothesized that hippocampal volume and neuronal and glial numbers would differ between these two species. A. macularia did not differ from C. pusilla in the total number of hippocampal neurons, but the species had a larger hippocampal formation and more hippocampal microglia. It remains to be investigated whether these differences indicate interspecies differences or neural specializations associated with different strategies of orientation and navigation.
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    Morfometria e descrição de otólitos de dourada (Brachyplatystoma rosseauxii) (Castelnau, 1855) e de piramutaba (B. vaillantii) (Valenciennes, 1840) (Siluriformes: pimelodidae) e verificação de anéis de crescimento em otólitos de juvenis de dourada e de piramutaba na Ilha de Colares - Baía de Marajó-PA
    (Universidade Federal do Pará, 2008-10-09) PIRKER, Lilianne Esther Mergulhão; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
    The dourada (Brachyplatystoma rousseauxii) and the piramutaba (B. vaillantii), two migratory freshwater catfishes, are exploited by both traditional and industrial fishery in the Amazonian. They are very important for the commercial fishery in this region and their stocks are currently sobrexploted. However there is a lack of information concerning the biology and ecology of juvenile stages of these catfishes in the scientific literature. In population dynamics studies, the correct age estimate influences the growth parameters, which are important to evaluate stocks. The studies of age determination are usually made using sub-adults and adults specimens. The juveniles are not analyzed and their age is back-calculated. Which could result in an error estimate. The aims of the present research were: (1) to describe and estimate the relation between the lapilli otoliths morfometric measurements and the body measurements of dourada and piramutaba, and (2) to examine the occurrence of the first growth rings in the juvenile specimens. The morfometric and descriptive studies were carried out using otoliths from dourada and piramutaba juveniles, sub-adults and adults collected in the municipalities of Colares (PA), Almeirim (PA), Santarém (PA), and Manaus (AM), in the District of Mosqueiro (PA), and in the Amazon estuary. The period of collection was different for each local, to September of 1996 to January of 2006. The following relations were estimated: furcal length from specimens (LF) x total weight from specimens (WT); LF x maximum otolith length (MOL); LF x maximum otolith width (MOW); LF x otolith total weight (OWT); WT x MOL; WT x MOW and WT x OWT. The estimated equations were: Dourada: WT = 9.5 x 10-6 x LF 3.0279, LF = 25.259 * MOL1.1571, LF = 40.626 * MOW1.2127, LF = 840.419 * OWT0.4077, WT = 0.125 * MOL3.6547, WT = 0.568 * MOW3.8294, WT = 7549.98 * OWT1.2651; Piramutaba: WT = xxx 5.4 x 10-6 x LF 3.1441, LF = 31.871 * MOL1.3381, LF = 55.852 * MOW1.3722, LF = 1641.064 * OWT0.4686, WT = 0.3127 * MOL4.1857, WT = 1.823 * MOW4.2788, WT = 66675.977 * OWT1.4508. In the descriptive study, the lapilli of dourada and piramutaba were classified in the following categories according to their development and specimens LF: dourada I (60 a 80 mm), dourada II (80 a 110 mm), dourada III (110 a 210 mm), piramutaba I (65 a 80 mm), piramutaba II (80 a 110 mm), and piramutaba III (110 a 190 mm). In the lapillus ring reading study, only the juveniles specimens £ 200 mm LF were used. In the Marajó bay, douradas and piramutabas with 175.03 mm and 171.03 mm mean LF, respectively, showed the first growth ring. Both species were between nine and twelve months old when they showed the first growth ring. The mean rays of the first hyaline ring in the transversal cut of dourada’s and piramutaba’s lapillus were 0.36 mm (± 0.03) and 0.33 mm (± 0.01), respectively. The mean total ray of the lapillus transversal cut was 0.64 mm (± 0.14) in dourada and 0.53 mm (± 0.09) in piramutaba. The estimated equation relating the total ray of the lapillus transversal cut of douradas juveniles with its LF was LF = 248.589 * Rt1.1901. The estimated equation for piramutaba was LF = 400.494 * Rt1.7178. Douradas and piramutabas 60-70 mm LF were three to six months old, 70-110 mm LF were six to nine months old, and 110-200 mm LF were nine to twelve months old.
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    Morphology and morphometry of three Plasmodium juxtanucleare (Apicomplexa: Plasmodiidae) isolates
    (Universidade Federal do Pará, 2007-09) OLIVEIRA, Carina Elisei de; FERNANDES, Kátia Roberta; FORLANO, Maria Dalila; MADUREIRA, Renata Cunha; SCOFIELD, Alessandra; YOTOKO, Karla Suemy Clemente; SOARES, Cleber Oliveira; ARAÚJO, Flábio Ribeiro de; MASSARD, Carlos Luiz
    In this work, three isolates of Plasmodium juxtanucleare have been analyzed based on morphological, morphometric and parasitic parameters. Each isolate was sampled from naturally infected adult chicken (Gallus gallus) from rural areas of three Brazilian municipalities: Seropédica (22º 48' S; 43º 41'W), in the state of Rio de Janeiro; Cruzeiro (22º 33' S; 44º 57'W), in the state of São Paulo; and Santa Bárbara do Tugúrio (21º 15' S; 43º 27' W), in the state of Minas Gerais. The blood samples taken from each infected chicken were inoculated in three groups of ten young chicken (21 days old). Blood smears of the experimentally infected chicken were sampled every two days until the 69th day in order to evaluate the parasitemia. For the morphological-descriptive and morphometric analyses, we measured 30 individuals from each of the intraerythocytic states, measures of the major (MD) and minor diameters (md), the estimation of morphometric index (Mi=md/MD) and size (T=pab, a= md/2; b=MD/2). The results indicated low and homogeneous parasitemia rates in the three strains, which showed differences among shape and size of the parasitic stadia displayed.
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    Morphometric analysis of feedforward pathways from the primary somatosensory area (S1) of rats
    (Universidade Federal do Pará, 2016-05) SÁ, Andrea Lima de; BAHIA, Carlomagno Pacheco; DIAS, Ivanira Amaral; BATISTA, C.; LEAL, Walace Gomes; PINHO, André Luís Santos de; HOUZEL, Jean Christophe; DINIZ, Cristovam Wanderley Picanço; PEREIRA JÚNIOR, Antônio; CORREA, Vânia Castro
    We used biotinylated dextran amine (BDA) to anterogradely label individual axons projecting from primary somatosensory cortex (S1) to four different cortical areas in rats. A major goal was to determine whether axon terminals in these target areas shared morphometric similarities based on the shape of individual terminal arbors and the density of two bouton types: en passant (Bp) and terminaux (Bt). Evidence from tridimensional reconstructions of isolated axon terminal fragments (n=111) did support a degree of morphological heterogeneity establishing two broad groups of axon terminals. Morphological parameters associated with the complexity of terminal arbors and the proportion of beaded Bp vs stalked Bt were found to differ significantly in these two groups following a discriminant function statistical analysis across axon fragments. Interestingly, both groups occurred in all four target areas, possibly consistent with a commonality of presynaptic processing of tactile information. These findings lay the ground for additional work aiming to investigate synaptic function at the single bouton level and see how this might be associated with emerging properties in postsynaptic targets.
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    Pesca, policromatismo e aspectos sistemáticos de Potamotrygon scobina Garmam, 1913 (Chondrichthyes : Potamotrygonidae) da região da Ilha de Colares - Baía de Marajó - Pará
    (Universidade Federal do Pará, 2003-03-07) ALMEIDA, Mauricio Pinto de; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
    The present study included specimens of the Family Potamotrygonidae, the only one among elasmobranchs formed entirely by freshwater representatives. This research was developed in the estuarine region of the Marajó Bay, in the island of Colares, during the months of May, August, October and December of 2000, December of 2001 and March of 2002. Sampling included the genera Plesiotrygon, Potamottygon, Paratrygon and a fourth undescribed genus, totalizing 723 captured specimens. Frequency of occurrence and biomass results indicated a predominance of the genus Potamotrygon especially of the species P. scobina in this area. Fishing gear utilized influenced the size of the stingrays captured. Specific observations related to the dorsal color patterns, size and sexual distribution of the species P. scobina were made. Results of multivariate statistical analysis and molecular genetics indicated that dorsal color patterns as currently employed in distinguishling morphotypes in fact did not indicate separate species and a single group was formed. Three previously undescribed dorsal color patterns for sub-adults / adults and two new patterns for juvenile specimens were identified for P. scobina. External characters analyzed for this species presented a wide variation in form, number, size and structure disposition that were more evident in sub-adults / adults. In this region, freshwater stingrays are routinely captured mainly for food and for medical and ornamental purposes. The conservation of freshwater stingrays species requires further knowledge about their biology and taxonomy in order to follow-up its exploitation and perhaps indicate management procedures.
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    Variação geográfica em Schizodon dissimilis (Garman, 1890) e diversidade genética e filogeográfica do grupo Schizodon fasciatus sensu lato (Characiformes: Anostomidae)
    (Universidade Federal do Pará, 2013) ABREU, João Marcelo da Silva; SCHNEIDER, Horacio; http://lattes.cnpq.br/3621033429800270
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