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Search Results: 1 - 10 of 325446 matches for " Carmem S. Fontanetti "
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Description and chromosome number of a species of Pseudonannolene Silvestri (Arthropoda, Diplopoda, Pseudonannolenidae)
Fontanetti, Carmem S.;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000100014
Abstract: pseudonannolene mesai sp.n. from biritiba mirim, state of s?o paulo, brazil, is described and the chromosome number (2n=16) is reported. it was impossible to observe the chromosomal sex determination mechanism.
Morphological characterization of the proventriculus of Gryllus assimilis Fabricius (Orthoptera, Gryllidae)
Fontanetti, Carmem S.;Zefa, Edison;
Revista Brasileira de Zoologia , 2000, DOI: 10.1590/S0101-81752000000100015
Abstract: the proventriculus morphology of the cricket gryllus assimilis fabricius, 1775 is described using scanning electron microscopy and the correlation of this structure with the feeding habits briefly considered.
Chromosomal characterization of Pseudonannolene strinatii (Spirostreptida, Pseudonannolenidae)
Campos, Kleber Agari;Fontanetti, Carmem S.;
Iheringia. Série Zoologia , 2004, DOI: 10.1590/S0073-47212004000100009
Abstract: the chromosomes of the cave millipede pseudonannolene strinatii mauriès, 1974 were investigated. the diploid chromosome number was found to be 2n=16, xx/xy; the c-banding technique revealed a large amount of heterochromatin while the silver staining technique (ag-nor) evidenced the presence of heteromorphism of the nors in some cells.
A new species of Urostreptus (Diplopoda, Spirostreptidae): description and chromossome number
Pierozzi, Pedro H. B.;Fontanetti, Carmem S.;
Iheringia. Série Zoologia , 2006, DOI: 10.1590/S0073-47212006000200011
Abstract: this work presents the description and chromosome number of urostreptus atrobrunneus sp. nov. the genus until now had not been registered yet in the s?o paulo state, brazil. the meiotic analysis showed that the species presents 2n=24, xy. the c-banding revealed large blocks of constitutive heterochromatin and two heteromorphic chromosomal pairs, one of them corresponding to the sexual pair.
Metanotal gland of the genus Eidmanacris (Grylloidea, Phalangopsidae): taxonomic importance
Prado, Rogilene Aparecida;Fontanetti, Carmem S.;
Iheringia. Série Zoologia , 2005, DOI: 10.1590/S0073-47212005000100012
Abstract: the present study compares the metanotal gland through scanning electron microscopy in five species of eidmanacris: e. corumbatai garcia, 1998, e. alboannulata (piza, 1960), e. dissimilis desutter-grandcolas, 1995, e. larvaeformis (chopard, 1938) and eidmanacris sp. the general external configuration of the gland was determined by the presence of two median projections with apical opening and a cluster of bristles just above these projections. although there is a general pattern for this gland, each species has its own pattern, which can be defined mainly by the arrangement of the bristles and the position of the median projections. our results suggest the taxonomical importance of these structures, which should be better analyzed when describing species of the genus eidmanacris. in addition, while observing the reproductive behavior of these species, we concluded that the release of this gland secretion is important for the success of mating.
Comparative cytogenetics in different populations of the cavernicolous diplopod Pseudonannolene strinatii (Diplopoda, Pseudonannolenidae) Citogenética comparativa em diferentes popula es do diplópodo cavernícola Pseudonannolene strinatii (Diplopoda, Pseudonannolenidae)
Kleber A. Campos,Carmem S. Fontanetti
Iheringia. Série Zoologia , 2013,
Abstract: Different populations of Pseudonannolene strinatii Mauriès, 1974 collected from three caves in Iporanga, state of S o Paulo, were cytogenetically compared using techniques of conventional coloration, C-banding and silver nitrate impregnation. Specimens were morphologically similar and small cytogenetic differences were observed between the populations with relation to the distribution of constitutive heterochromatin. Diferentes popula es de Pseudonannolene strinatii Mauriès, 1974 coletadas em três cavernas em Iporanga, Estado de S o Paulo, Brasil foram comparadas citogeneticamente utilizando-se técnicas de colora o convencional, bandamento C e impregna o com nitrato de prata. Indivíduos demonstraram-se morfologicamente similares e diferen as citogenéticas sutis foram observadas entre as popula es com rela o à distribui o da heterocromatina constitutiva.
Sugarcane Vinasse, a Residue of Ethanol Industry: Toxic, Cytotoxic and Genotoxic Potential Using the Allium cepa Test  [PDF]
Janaína Pedro-Escher, Cintya A. Christofoletti, Yadira Ansoar-Rodríguez, Carmem S. Fontanetti
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.75054
Abstract:

The search for fuels to replace petroleum consumption has caused an increase in the production of biofuels worldwide. The ethanol, which comes from sugarcane, is an energy resource with low polluting potential, but its production generates other environmental problems. On average, 10 to 15 liters of vinasse are generated while preparing each liter of ethanol. Vinasse is the final by-product of the biomass distillation, mainly for the production of ethanol, from different cultures such as sugarcane. Because excessive quantities of vinasse are produced, alternatives have been required for use, for example as fertilizer, in a process known as fertigation. These excessive amounts of vinasse applied in soils have generated adverse effects on soil properties and to the organisms. This study carried out the toxic, cytotoxic and genotoxic potential of sugarcane vinasse obtained from two different harvests (Samples I and II), using the Allium cepa organism test. A. cepa seeds were exposed to raw vinasse (RV) and diluted in different concentrations: control soil + raw vinasse (SV); vinasse diluted in water at 50% + control soil (V 50%); vinasse diluted in water at 25% + control soil (V 25%); vinasse diluted in water at 12.5% + control soil (V 12.5%). The chemical characterization of vinasse samples showed a low pH and high concentration of potassium. The results demonstrate that the two RV samples tested are toxic, since no seeds germination was observed. The cytotoxic potential was observed in the sample II of SV and V (50%). All groups evaluated in samples I and II, induced chromosomal alterations, statistically significant compared with negative control. An increase in frequency of micronuclei in meristematic cells was observed in the SV (Sample I) and all groups evaluated in samples II. Based on the results it is concluded that the genetic material of the test-system was damaged when exposed to sugarcane vinasse, suggesting that one should be very careful in the use of this waste that has been used sometimes indiscriminately in soils.

Biosolid Soil Application: Toxicity Tests under Laboratory Conditions
Cintya Ap. Christofoletti,Annelise Francisco,Carmem S. Fontanetti
Applied and Environmental Soil Science , 2012, DOI: 10.1155/2012/518206
Abstract: A large volume of generated sewage sludge makes its disposal a problem. The usage of sludge in agriculture is highlighted by a number of advantages. However, heavy metals and other toxic compounds may exercise harmful effects to soil organisms. This study evaluated the possible toxic effects of a biosolid sample, under laboratory conditions, for 30 days, using diplopods Rhinocricus padbergi and plants Allium cepa (onion) as test organisms. The data obtained demonstrated that the biosolid raw sample had genotoxic potential for Allium cepa root tip cells. In the diplopods exposed to biosolid sample, epithelium disorganization in the midgut and a reduction of the volume of the hepatic cells were observed after 7 days of exposure. After 30 days, the animals still showed a reduction of the volume of the hepatic cells, but in minor intensity. Allium cepa analysis showed genotoxicity, but this effect was reduced after 30 days of bioprocessing by diplopods. This study was important to know the effects as well as to determine how this waste could be applied concerning the soil living organisms and plants. 1. Introduction In sewage treatment plants (STP), after the sewage had been treated, a sludge rich in organic matter and nutrients is generated as a waste, known as sewage sludge. The composition of this sludge is very variable since it depends on the source of the sewage treatment process and the seasonality [1]. Generally, the sewage sludge presents around 40% to 60% of organic matter, 4% nitrogen, 2% phosphorus, and other macro- and micronutrients, besides potentially toxic elements [2]. The generated sewage sludge still can go through processes in order to increase the solids and reduce the number of pathogenic organisms, generating a residue called biosolid, which is considered most innocuous than the sewage sludge itself [3]. Good quality fertilizers can be generated with the sludge stabilization, reducing its volume through the use of “sludge thickeners drying beds,” filter presses, band presser, vacuum filters, and centrifugation [4]. According to Lambais and Do Carmo [5], chemical composition of the sludge depends on the origin of the wastewater. This way, the material is variable, but generally it is a compound rich in organic matter and essential nutrients for plants and microorganisms. Currently, sewage treatment plants in different Brazilian cities are facing the problem of sludge disposal. The alternatives to the sewage sludge usual fate are landfill disposal, reuse in industry (light-weight aggregate production, bricks and ceramics manufacturing,
Cryptic species of Gryllus in the light of bioacoustic (Orthoptera: Gryllidae)
David, José A. de O.;Zefa, Edison;Fontanetti, Carmem S.;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000100010
Abstract: the gryllus genus represents one the most complex in the orthoptera systematic, characterized by a set of cosmopolite and cryptic species, many of them already described. this study compared the songs emitted by gryllus specimens collected on the unesp campus in rio claro (sp) and the pars stridens morphology and morphometry, to use the results to recognize possible cryptic species and contribute to the discussion of speciation processes. three groups of crickets were discriminated by differences in the pars stridens and calling songs, characterized by different rhythms, frequencies and note composition, that indicated the presence of three species in the location analyzed, that presented few morphological differences. it is suggested from the results that the use of the pars stridens characteristics and the calling song as diagnostic traits is essential in the gryllus taxonomy.
Application of the comet assay in erythrocytes of Oreochromis niloticus (Pisces): a methodological comparison
Christofoletti, Cintya A.;David, José Augusto O.;Fontanetti, Carmem S.;
Genetics and Molecular Biology , 2009, DOI: 10.1590/S1415-47572009005000020
Abstract: the present study applied the comet assay to erythrocytes of oreochromis niloticus with the aim of improving protocols to detect dna damage in these cells, by using two distinct phs (ph = 12.1 and ph > 13) and evaluating whether there is a correspondence between silver and ethidium bromide staining. comets were visually examined and, the frequency of cells with and without damage was obtained, as well as the distribution of classes and scores. by using the kruskal-wallis test, our results revealed that ph 12.1 is more effective, although both phs can be used. our findings also suggest that silver staining can substitute ethidium bromide, an expensive and highly toxic stain that requires specific equipment for examination.
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