It is known that pollution alongside Tamanduateí River (Sao Paulo State, Brazil) is in-tense. Our... more It is known that pollution alongside Tamanduateí River (Sao Paulo State, Brazil) is in-tense. Our study attempted to analyze absorbance, dissolved oxygen and turbidity of water samples from the river. We analyzed the results to verify the inten-sity of pollution associated with urbanization around the Sao Paulo City metropolitan area, known as the Great ABC region. These parameters were tested: wa-ter turbidity, absorbance and dissolved oxygen in three different locations in the river, being the first at the springing site, the second at a point below the springing site, and the third at Avenida dos Estados in Santo André municipality, near the University of ABC. Our results evidenced that the source is little polluted and the other spots are highly polluted. Future inves-tigations should be carried out to quantify and identify pollutants.
Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) ... more Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) collected in Tangará da Serra, Mato Grosso State, in the stream Buriti (14°37’23.01"S 57°28’46.80"W), tributary of the left branch of the Sepotuba River, in the Upper Paraguay Basin. The karyotype analysis in Knodus cf. chapadae showed diploid number 2n=52 chromosomes with karyotype formula comprised of 14m+14sm+14sm+10a and fundamental equalent number 94. Most acrocentric chromosomes show the presence of C-heterochromatin in the pericentromeric region of short arms. Knodus cf. chapadae presented multiple NOR sites, occurring in two chromosome pairs. The cytogenetic data obtained for the species Knodus cf. chapadae demonstrates the importance of this analysis and confirms the karyotype and taxonomic complexity of this group of fish (incertae sedis) within the family Characidae. It is suggested that the studies on NORs in the genus Knodus require further detailed analysis employ...
In the present work, the metaphase chromosomes characids the Paraguay River basin, three differen... more In the present work, the metaphase chromosomes characids the Paraguay River basin, three different locations were studied. Bento Gomes River, Poconé (MT) Markiana nigripinnis, with 2n = 52 (24M, 8SM, 4ST and 16A) and also showing one chromosome pair with NORs sites; Two cytotypes of Tetragonopterus argenteus, with 2n = 50 (14M, 4SM, 4ST and 28A), cytotype 1, has up to 4 chromosomes carrying NORs. The cytotype 2 showed 2n = 52 (14M, 4SM, 4ST and 30A) and only one pair of NORs. Miranda river, two males Tetragonopterus argenteus, which showed a similar karyotype to that described for cytotype 1, Cuiabá River were analyzed. The cytotype 1 is a synapomorphy for the group as external groups Tetragonopterus argenteus have 2n = 52 cytotype 1 and therefore probably of more recent origin. Keywords: argenteus Tetragonopterus, nigripinnis Markiana, cytotype, cytogenetics, Pantanal, Mato Grosso.
Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) ... more Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) collected in Tangará da Serra, Mato Grosso State, in the stream Buriti (14°37’23.01"S 57°28’46.80"W), tributary of the left branch of the Sepotuba River, in the Upper Paraguay Basin. The karyotype analysis in Knodus cf. chapadae showed diploid number 2n=52 chromosomes with karyotype formula comprised of 14m+14sm+14sm+10a and fundamental equalent number 94. Most acrocentric chromosomes show the presence of C-heterochromatin in the pericentromeric region of short arms. Knodus cf. chapadae presented multiple NOR sites, occurring in two chromosome pairs. The cytogenetic data obtained for the species Knodus cf. chapadae demonstrates the importance of this analysis and confirms the karyotype and taxonomic complexity of this group of fish (incertae sedis) within the family Characidae. It is suggested that the studies on NORs in the genus Knodus require further detailed analysis employ...
Sumary Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogen... more Sumary Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogenetically. They were from different rivers and creeks of the Pantanal Basin, in the state of Mato Grosso, Brazil. The populations were from four distinct locations: population A (4F and 8M), Coxipó river, in the county of Chapada dos Guimarães; population B (4F and 11M), Pari Creek, in the county of Cuiabá; population C (18F and 24M), Flechas Creek, the county of Cáceres and population D (15F and 7M), Fundo Creek, in the county of Poconé. The modal diploid number is 2n=42 chromosomes (24M, 10SM and 8ST) and FN=84. Band C shows a system of sexual chromosomes XX/XY in populations B, C and D. The Ag-RONs are simple, with markers on pair 16 of the specimens analyzed. Sexual chromosomes aren't rare in fishes but Ancistrus shows the unique case of two systems of sexual chromosomes, ZZ/ZW and XX/XY, in the specie identified as Ancistrus cf. dubius, and specimens of population A has no differ...
Propolis, the resinous hive product collected by bees, is important in the defense of the hive. T... more Propolis, the resinous hive product collected by bees, is important in the defense of the hive. The effects of propolis on growth and glucosyltransferase activity of< i> Streptococcus sobrinus</i> 6715,< i> Streptococcus mutans</i> PS14 and< i> Streptococcus cricetus</i> ...
Fishes of the family Anostomidae (Characiformes) represent one of the most important groups of fr... more Fishes of the family Anostomidae (Characiformes) represent one of the most important groups of freshwater fishes of South America, with many species of high economic value in terms of fishing, fish farms and as ornamental species. This family has 12 genera with 138 described species and about 25 new species not yet described. When considered the cytogenetic researches conducted with this family the majority of studies was performed with groups of fish with spots and are few the analyses with groups of stripes. Chromosomally the anostomids with spots represents one of the groups of fish best studied with species showed sex chromosomes (ZZ / ZW) and supernumerary chromosomes, although the majority does not present sex chromosomes. Thus, this study aimed to assist in cytogenetic knowledge of this group of fish through of chromosomal analysis of species Leporellus vittatus and Leporinus striatus. Both species analyzed showed diploid modal value of 2n = 54 chromosomes distributed in meta...
Resumo. O Cloreto de Ferro III é empregado no tratamento de esgoto industrial. Posteriormente, fo... more Resumo. O Cloreto de Ferro III é empregado no tratamento de esgoto industrial. Posteriormente, foi introduzido em processos de fotogravura por ser um composto pouco tóxico. O presente trabalho tem caráter iné-dito, tendo como principal objetivo estudar as mudanças causadas no ambiente aquático pelo Cloreto de Ferro III, analisando impactos tanto biológicos quanto químicos em estruturas metálicas. Os resultados obti-dos com análises químicas e biológicas demonstraram o impacto da solu-ção quando descartada em ambientes aquáticos lóticos e ao entrar em contato com a superfície de vigas formadas, em parte, por ferro. Os tes-tes biológicos foram realizados a partir da água retirada de um lago do parque "Celso Daniel", município de Santo André – SP, em ambiente com temperatura controlada. O descarte de soluções de Cloreto de Ferro III em ambientes aquáticos de maneira arbitrária ocasiona a degradação de estruturas metálicas e impacta a fauna local, sendo necessário um estudo ma...
A free-size canonical variable analysis was made to investigate the morphological pattern of vari... more A free-size canonical variable analysis was made to investigate the morphological pattern of variation among different Thoracocharax stellatus populations in South American river basins: Araguaia-Tocantins and Paraguay Basins Rivers from Brazil, and Orinoco's basin in Venezuela. Distinction among the samples from Araguaia-Tocantins and Orinoco were observed, with overlap of these populations with the Paraguay's basin samples. The primarily characters responsible for this discrimination are head length and dorsal fin length. The mechanisms that can act in this geographic variation among T. stellatus populations are discussed.
It is known that pollution alongside Tamanduateí River (Sao Paulo State, Brazil) is in-tense. Our... more It is known that pollution alongside Tamanduateí River (Sao Paulo State, Brazil) is in-tense. Our study attempted to analyze absorbance, dissolved oxygen and turbidity of water samples from the river. We analyzed the results to verify the inten-sity of pollution associated with urbanization around the Sao Paulo City metropolitan area, known as the Great ABC region. These parameters were tested: wa-ter turbidity, absorbance and dissolved oxygen in three different locations in the river, being the first at the springing site, the second at a point below the springing site, and the third at Avenida dos Estados in Santo André municipality, near the University of ABC. Our results evidenced that the source is little polluted and the other spots are highly polluted. Future inves-tigations should be carried out to quantify and identify pollutants.
Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) ... more Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) collected in Tangará da Serra, Mato Grosso State, in the stream Buriti (14°37’23.01"S 57°28’46.80"W), tributary of the left branch of the Sepotuba River, in the Upper Paraguay Basin. The karyotype analysis in Knodus cf. chapadae showed diploid number 2n=52 chromosomes with karyotype formula comprised of 14m+14sm+14sm+10a and fundamental equalent number 94. Most acrocentric chromosomes show the presence of C-heterochromatin in the pericentromeric region of short arms. Knodus cf. chapadae presented multiple NOR sites, occurring in two chromosome pairs. The cytogenetic data obtained for the species Knodus cf. chapadae demonstrates the importance of this analysis and confirms the karyotype and taxonomic complexity of this group of fish (incertae sedis) within the family Characidae. It is suggested that the studies on NORs in the genus Knodus require further detailed analysis employ...
In the present work, the metaphase chromosomes characids the Paraguay River basin, three differen... more In the present work, the metaphase chromosomes characids the Paraguay River basin, three different locations were studied. Bento Gomes River, Poconé (MT) Markiana nigripinnis, with 2n = 52 (24M, 8SM, 4ST and 16A) and also showing one chromosome pair with NORs sites; Two cytotypes of Tetragonopterus argenteus, with 2n = 50 (14M, 4SM, 4ST and 28A), cytotype 1, has up to 4 chromosomes carrying NORs. The cytotype 2 showed 2n = 52 (14M, 4SM, 4ST and 30A) and only one pair of NORs. Miranda river, two males Tetragonopterus argenteus, which showed a similar karyotype to that described for cytotype 1, Cuiabá River were analyzed. The cytotype 1 is a synapomorphy for the group as external groups Tetragonopterus argenteus have 2n = 52 cytotype 1 and therefore probably of more recent origin. Keywords: argenteus Tetragonopterus, nigripinnis Markiana, cytotype, cytogenetics, Pantanal, Mato Grosso.
Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) ... more Cytogenetic studies were made in Knodus cf. chapadae (Characiformes, Characidae, incertae sedis) collected in Tangará da Serra, Mato Grosso State, in the stream Buriti (14°37’23.01"S 57°28’46.80"W), tributary of the left branch of the Sepotuba River, in the Upper Paraguay Basin. The karyotype analysis in Knodus cf. chapadae showed diploid number 2n=52 chromosomes with karyotype formula comprised of 14m+14sm+14sm+10a and fundamental equalent number 94. Most acrocentric chromosomes show the presence of C-heterochromatin in the pericentromeric region of short arms. Knodus cf. chapadae presented multiple NOR sites, occurring in two chromosome pairs. The cytogenetic data obtained for the species Knodus cf. chapadae demonstrates the importance of this analysis and confirms the karyotype and taxonomic complexity of this group of fish (incertae sedis) within the family Characidae. It is suggested that the studies on NORs in the genus Knodus require further detailed analysis employ...
Sumary Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogen... more Sumary Four populations of Ancistrus cf. dubius (Loricariidae, Ancistrinae) were analyzed cytogenetically. They were from different rivers and creeks of the Pantanal Basin, in the state of Mato Grosso, Brazil. The populations were from four distinct locations: population A (4F and 8M), Coxipó river, in the county of Chapada dos Guimarães; population B (4F and 11M), Pari Creek, in the county of Cuiabá; population C (18F and 24M), Flechas Creek, the county of Cáceres and population D (15F and 7M), Fundo Creek, in the county of Poconé. The modal diploid number is 2n=42 chromosomes (24M, 10SM and 8ST) and FN=84. Band C shows a system of sexual chromosomes XX/XY in populations B, C and D. The Ag-RONs are simple, with markers on pair 16 of the specimens analyzed. Sexual chromosomes aren't rare in fishes but Ancistrus shows the unique case of two systems of sexual chromosomes, ZZ/ZW and XX/XY, in the specie identified as Ancistrus cf. dubius, and specimens of population A has no differ...
Propolis, the resinous hive product collected by bees, is important in the defense of the hive. T... more Propolis, the resinous hive product collected by bees, is important in the defense of the hive. The effects of propolis on growth and glucosyltransferase activity of< i> Streptococcus sobrinus</i> 6715,< i> Streptococcus mutans</i> PS14 and< i> Streptococcus cricetus</i> ...
Fishes of the family Anostomidae (Characiformes) represent one of the most important groups of fr... more Fishes of the family Anostomidae (Characiformes) represent one of the most important groups of freshwater fishes of South America, with many species of high economic value in terms of fishing, fish farms and as ornamental species. This family has 12 genera with 138 described species and about 25 new species not yet described. When considered the cytogenetic researches conducted with this family the majority of studies was performed with groups of fish with spots and are few the analyses with groups of stripes. Chromosomally the anostomids with spots represents one of the groups of fish best studied with species showed sex chromosomes (ZZ / ZW) and supernumerary chromosomes, although the majority does not present sex chromosomes. Thus, this study aimed to assist in cytogenetic knowledge of this group of fish through of chromosomal analysis of species Leporellus vittatus and Leporinus striatus. Both species analyzed showed diploid modal value of 2n = 54 chromosomes distributed in meta...
Resumo. O Cloreto de Ferro III é empregado no tratamento de esgoto industrial. Posteriormente, fo... more Resumo. O Cloreto de Ferro III é empregado no tratamento de esgoto industrial. Posteriormente, foi introduzido em processos de fotogravura por ser um composto pouco tóxico. O presente trabalho tem caráter iné-dito, tendo como principal objetivo estudar as mudanças causadas no ambiente aquático pelo Cloreto de Ferro III, analisando impactos tanto biológicos quanto químicos em estruturas metálicas. Os resultados obti-dos com análises químicas e biológicas demonstraram o impacto da solu-ção quando descartada em ambientes aquáticos lóticos e ao entrar em contato com a superfície de vigas formadas, em parte, por ferro. Os tes-tes biológicos foram realizados a partir da água retirada de um lago do parque "Celso Daniel", município de Santo André – SP, em ambiente com temperatura controlada. O descarte de soluções de Cloreto de Ferro III em ambientes aquáticos de maneira arbitrária ocasiona a degradação de estruturas metálicas e impacta a fauna local, sendo necessário um estudo ma...
A free-size canonical variable analysis was made to investigate the morphological pattern of vari... more A free-size canonical variable analysis was made to investigate the morphological pattern of variation among different Thoracocharax stellatus populations in South American river basins: Araguaia-Tocantins and Paraguay Basins Rivers from Brazil, and Orinoco's basin in Venezuela. Distinction among the samples from Araguaia-Tocantins and Orinoco were observed, with overlap of these populations with the Paraguay's basin samples. The primarily characters responsible for this discrimination are head length and dorsal fin length. The mechanisms that can act in this geographic variation among T. stellatus populations are discussed.
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