Research Article

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02/26/2008
Antiteuchus; Heteroptera; Nucleolus; Pentatomidae; testicular lobe differentiation

The pattern of silver nitrate (Ag)-staining differed among testicular lobes of Antiteuchus tripterus. In general, these differences are in regard to the number, size, shape, coloring intensity, and location of the stained bodies or masses, observed during meiosis and spermiogenesis. These characteristics were similar in lobes 1-3. Lobes 4-6, however, differed from each other and from ... more

H.V. Souza; M.M.U. Castanhole; H.E.M.C. Bicudo; M.M. Itoyama
06/03/2008
Acid phosphatase; Acridine orange; Development; Drosophila; Programmed cell death; Salivary gland

Programmed cell death (PCD) in insect metamorphosis assumes a great diversity of morphology and controlling processes that are still not well understood. With the objective of obtaining information about the PCD process, salivary glands of Drosophila arizonae and D. mulleri were studied during larval-pupal development. From the results, it can be concluded that the type of ... more

P. Ianella; M.T.V. Azeredo-Oliveira; M.M. Itoyama
11/29/2005
Fluorescent in situ hybridization; Heteroptera; Holocentric chromosomes; Nucleolar organizer region; Triatominae

Chromatin organization in the holocentric chromosomes of three triatomines species was cytologically studied by fluorescent in situ hybridization with a 45S rDNA probe of Drosophila melanogaster to localize ribosomal genes. In Triatoma tibiamaculata, metaphases I showed telomeric highlights in a single, larger bivalent. In T. protacta, hybridization ... more

G.Dias de Ca Severi-Aguiar; M.Tercília de Azeredo-Oliveira
04/06/2010
Acid phosphatase; Reproduction; Spermatogenesis; Testis; Vertebrates

Acid phosphatases (AcPs) are known to provide phosphate to tissues that have high energy requirements, especially during development, growth and maturation. During spermatogenesis AcP activity is manifested in heterophagous lysosomes of Sertoli cells. This phagocytic function appears to be hormone-independent. We examined the expression pattern of AcP during the reproductive period of ... more

R.L. Peruquetti; S.R. Taboga; M.T.V. Azeredo-Oliveira
04/20/2010
Acledra; Heteroptera; Holokinetic chromosomes; Karyotypic variation; Meiosis; Pentatomidae

Acledra comprises 15 taxonomically identified species, most of which are crop pests. This is the first cytogenetic study of species of this genus. Acledra kinbergii and A. modesta showed the modal number of the Pentatomidae (2n = 14 = 12 + XY), while A. bonariensis had a reduced complement (2n = 12 = 10 + XY), with a markedly larger autosomal ... more

P.J. Rebagliati; L.M. Mola
11/07/2013
Auchenorrhyncha; Gerromorpha; Heteroptera; mtDNA; Nepomorpha

We made the first analysis of the COI gene sequences of 22 species of spittlebugs and aquatic true bugs sampled in São Paulo State (Brazil) and used this information to determine the variability within these groups. Considering each codon position, we observed that the third base was the most variable, and the first base was the most conserved. Among species, Mahanarva ... more

M.M.U. Castanhole; S.R.C. Marchesin; L.L.V. Pereira; F.F.F. Moreira; J.F. Barbosa; J.R. Valério; M.M. Itoyama
09/30/2007
Acid phosphatase; Ambient pH; Aspergillus nidulans; Colonial growth; Enzyme secretion; palC gene

The present study was designed to identify nutrient-dependent changes in extracellular pH and acid phosphatase secretion in the biA1 palC4 mutant strain of Aspergillus nidulans. The palC4 mutant was selected as lacking alkaline phosphatase, but having substantially increased acid phosphatase activity when grown on solid minimal medium under phosphate ... more

J.S. Freitas; E.M. Silva; A. Rossi
08/30/2020
Acid phosphatase; Aerenchyma; Northern blot; Pi- content; Root/shoot ratio

We compared three Pi-efficient (ATF-14B, ATF-53B, 101B) and four Pi-inefficient (ATF-16B, 116R, 136B, 187R) sorghum genotypes under different Pi concentrations. There were no significant differences between the groups in Pi-use efficiency under Pi-deprivation for anthocyanin accumulation, dry-weight matter, acid phosphatase activity (APA), and aerenchyma formation ... more

M.J.V. Vasconcelos; J.E.F. Figueiredo; K.G. Raghothama
10/26/2006
Drosophila; Microchromosome; Nucleolar dominance; Nucleolus; Polytene chromosome

Drosophila mulleri (MU) and D. arizonae (AR) are cryptic species of the mulleri complex, mulleri subgroup, repleta group. Earlier cytogenetic studies revealed that these species have different regulatory mechanisms of nucleolar organizing activity. In these species, nucleolar organizing regions are found in both the X chromosome and the microchromosome. In ... more

C.I. Oliveira; M.M. Itoyama; H.E.M.C. Bicudo
11/17/2009
Hemiptera; Nucleolus; Spermatogenesis; Spermiogenesis; Testicular lobes

We studied the karyotype, spermatogenesis and nucleolar activity at spermatogenesis in five species of Heteropera: Hyalymenus sp and Neomegalotomus pallescens, Alydidae; Catorhintha guttula and Hypselonotus fulvus, Coreidae; and Niesthrea sidae, Rhopalidae. They showed a red (Alydidae) or orange (Coreidae and Rhopalidae) membrane covering the ... more

H.V. Souza; F.B. Souza; S.R.C. Maruyama; M.M.U. Castanhole; M.M. Itoyama

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