abstract：:Drosophila serido and D. antonietae are sibling species belonging to the Drosophila buzzatii cluster. Morphologically, they can only be discriminated by quantitative traits. In this paper we analyze the length and equalized average curvature of four regions of the aedeagus of D. antonietae and D. serido. Specimens of ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Franco FF,Prado PR,Sene FM,Costa LF,Manfrin MH

更新日期：2006-06-01 00:00:00

abstract：:Analogue experiments were carried out to get insights into the processes governing positive inversion during the foreland propagating thrust tectonics in the southern Serra do Espinhaço, a Brasiliano/Panafrican foldthrust belt in southeast Brazil. In particular, model listric half-grabens were inverted by applying con...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Gomes CJ,Martins-Neto MA,Ribeiro VE

更新日期：2006-06-01 00:00:00

abstract：:Establishment of infection by Trypanosoma cruzi, the agent of Chagas' disease, depends on a series of events involving interactions of diverse parasite molecules with host components. Here we focus on the mechanisms of target cell invasion by metacyclic trypomastigotes (MT) and mammalian tissue culture trypomastigotes...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Yoshida N

更新日期：2006-03-01 00:00:00

abstract：:Observations on the ecology of silvatic Triatominae are still fragmentary, principally because target species in control process are almost exclusively domestic. Report of silvatic species invading human dwellings must lead research to be focused on their original ecology, in order to assist in understanding their pro...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Noireau F,Carbajal-de-la-Fuente AL,Lopes CM,Diotaiuti L

更新日期：2005-09-01 00:00:00

abstract：:Limnoperna fortunei, an Asiatic rivers bivalve has become a worldwide problematic invasive species causing several water quality and macrofouling problems. In the Neotropical region it was first recorded in 1991 in the Rio de la Plata coast, Buenos Aires province. Since this, it showed a quick upstream invasion into t...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Brugnoli E,Clemente J,Boccardi L,Borthagaray A,Scarabino F

更新日期：2005-06-01 00:00:00

abstract：UNLABELLED:Thirty-five patients (23 males and 12 females), age 35 +/- 13 years old, presenting either idiopathic calcium nephrolithiasis, nephrocalcinosis or mild renal failure with idiopathic calcium nephrolithiasis were selected for the analysis of low molecular weight proteinuria and the possible mutations occurrenc...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Rebelo MA,Tostes V,Araújo NC,Martini SV,Botelho BF,Guggino WB,Morales MM

更新日期：2005-03-01 00:00:00

abstract：:The specific concept of G. geckoides was initially ascertained based on a topotypical sample from Salvador, Bahia. Geographic differentiation was studied through the analysis of two meristic characters (tubercles in a paramedian row and fourth toe lamellae) and color pattern of 327 specimens from 23 localities. It is ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Vanzolini PE

更新日期：2004-12-01 00:00:00

abstract：:Leishmania amazonensis is the main agent of diffuse cutaneous leishmaniasis, a disease associated with anergic immune responses. In this study we show that the crude antigen of Leishmania amazonensis (LaAg) but not L. braziliensis promastigotes (LbAg) contains substances that suppress mitogenic and spontaneous prolife...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Pinheiro RO,Pinto EF,Benedito AB,Lopes UG,Rossi-Bergmann B

更新日期：2004-09-01 00:00:00

abstract：:There is growing evidence that, during song learning, birds do not only acquire 'what to sing' (the inventory of behavior), but also 'how to sing' (the singing program), including order-features of song sequencing. Common Nightingales Luscinia megarhynchos acquire such serial information by segmenting long strings of ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Hultsch H,Todt D

更新日期：2004-06-01 00:00:00

abstract：:Penguins identify their mate or chick by an acoustic signal, the display call. This identification is realized in a particularly constraining environment: the noisy world of a colony of thousands of birds. To fully understand how birds solve this problem of communication, we have done observations, acoustic analysis, ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Aubin T

更新日期：2004-06-01 00:00:00

abstract：:In the Budgerigar Melopsittacus undulatus, the significance of a conspecific alarm call was investigated in two seasons, winter and spring. Two qualitatively different behavioral responses were displayed by the receivers in reply to playbacks: call(s) and/or taking flight(s). The comparative analysis of the number of ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Nicolas G,Fraigneau C,Aubin T

更新日期：2004-06-01 00:00:00

abstract：:Using Shannon information theory is a common strategy to measure any kind of variability in a signal or phenomenon. Some methods were developed to adapt information entropy measures to bird song data trying to emphasize its versatility aspect. This classical approach, using the concept of bit, produces interesting res...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Piqueira JR

更新日期：2004-06-01 00:00:00

abstract：:Obligatory intracellular parasites such as Plasmodium sp, Trypanosoma cruzi, Toxoplasma gondii and Leishmania sp are responsible for the infection of hundreds of millions of individuals every year. These parasites can deliver antigens to the host cell cytoplasm that are presented through MHC class I molecules to prote...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Rodrigues MM,Boscardin SB,Vasconcelos JR,Hiyane MI,Salay G,Soares IS

更新日期：2003-12-01 00:00:00

abstract：:Lutzomyia longipalpis is the most important vector of AmericanVisceral Leishmaniasis (AVL) due to Leishmania chagasi in the New World. Despite its importance, AVL, a disease primarily of rural areas, has increased its prevalence and became urbanized in some large cities in Brazil and other countries in Latin America. ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Soares RP,Turco SJ

更新日期：2003-09-01 00:00:00

abstract：:In the present work, the ester synthesis in organic media catalyzed by lipases immobilized on chrysotile was studied. Lipases of different sources (Mucor javanicus, Pseudomonas cepacia, Rhizopus oryzae, Aspergillus niger and Candida rugosa) were immobilized on chrysotile, an inexpensive magnesium silicate, and used fo...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Silva JE,Jesus PC

更新日期：2003-06-01 00:00:00

abstract：:A total of 30 animals of the genus Dasyprocta were cytogenetically studied. They belong to the following species: D. prymnolopha (N=20), D. leporina (N=6), D. fuliginosa (N=1) and Dasyprocta sp. (N=3) (Dasyproctidae, Hystricognathi). Cell suspensions were obtained by peripheral blood culture, besides bone marrow and s...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Ramos RS,Vale WG,Assis FL

更新日期：2003-03-01 00:00:00

abstract：:Miconazole is reduced at mercury electrode above pH 6 involving organometallic compound formation, responsible for an anomalous polarographic behavior. The electrodic process presents a large contribution of the adsorption effects. The drug can be determined by cathodic stripping voltammetry from 8.0 x 10(-8) to 1, 5 ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Pereira FC,Stradiotto NR,Zanoni MV

更新日期：2002-09-01 00:00:00

abstract：:Bioceramic composites were obtained from chitosan and hydroxyapatite pastes synthesized at physiological temperature according to two different syntheses approaches. Usual analytical techniques (X-ray diffraction analysis, Fourier transformed infrared spectroscopy, Thermo gravimetric analysis, Scanning electron micros...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Finisie MR,Josué A,Fávere VT,Laranjeira MC

更新日期：2001-12-01 00:00:00

abstract：:Multidrug resistance to chemotherapy is a major obstacle in the treatment of cancer patients. The best characterised mechanism responsible for multidrug resistance involves the expression of the MDR-1 gene product, P-glycoprotein. However, the resistance process is multifactorial. Studies of multidrug resistance mecha...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Rumjanek VM,Trindade GS,Wagner-Souza K,de-Oliveira MC,Marques-Santos LF,Maia RC,Capella MA

更新日期：2001-03-01 00:00:00

abstract：:Since William James (1890) first distinguished primary from secondary memory, equivalent to short- and long-term memory, respectively, it has been assumed that short-term memory processes are in charge of cognition while long-term memory is being consolidated. From those days a major question has been whether short-te...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Vianna MR,Izquierdo LA,Barros DM,Walz R,Medina JH,Izquierdo I

更新日期：2000-09-01 00:00:00

abstract：:This paper discusses the facies distribution of Mesozoic eolian sandstones between the Sanga do Cabral and Botucatu formations and also their contact relationships, in São Leopoldo area, State of Rio Grande do Sul (RS), southern Brazil. The main distinctive characteristics regarding these sandstones and formations are...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Nowatzki CH,Kern HP

更新日期：2000-06-01 00:00:00

abstract：:A relevant series of symmetric supramolecular porphyrins has been obtained by attaching four [RuII(bipy)2Cl] groups to the pyridyl substituents of meso-tetra(4-pyridyl)porphyrin and its metallated derivatives. These compounds display a rich electrochemistry and versatile catalytic, electrocatalytic and photochemical p...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Araki K,Lima Sde S,Winnischofer H

更新日期：2000-01-01 00:00:00

abstract：:Microglial cells within the developing central nervous system (CNS) originate from mesodermic precursors of hematopoietic lineage that enter the nervous parenchyma from the meninges, ventricular space and/or blood stream. Once in the nervous parenchyma, microglial cells increase in number and disperse throughout the C...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Navascués J,Calvente R,Marín-Teva JL,Cuadros MA

更新日期：2000-01-01 00:00:00

abstract：:Although recently developed drugs have brought significant improvement, the treatment of psychotic disorders still presents serious drawbacks. Since inherent complexity and lack of satisfactory understanding of the underlying pathophysiology impose limits for rational drug design, resourceful approaches in the search ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Costa-Campos L,Elisabetsky E,Lara DR,Carlson TJ,King SR,Ubillas R,Nunes DS,Iwu MM,Nkemjika CO,Ozioko A,Agwu CO

更新日期：1999-01-01 00:00:00

abstract：:In the present work, we report the synthesis and characterization of five (4-alkylalmino-4'-fluoro)-diphenyl sulphones, four of which have not been described before. In a preliminary evaluation of their biological activity, these products showed no effect on several Gram-positive and Gram-negative bacteria and yeasts....

journal_title：Anais da Academia Brasileira de Ciencias

authors： de Sousa Júnior PT,Miller J,Giesbrecht AM

更新日期：1996-01-01 00:00:00

abstract：:This paper reports on total Hg concentrations in muscle tissue from 12 fish species collected in the Itacaiúnas and Parauapebas Rivers in the Carajás region, South Pará. It is found that carnivorous species present Hg concentrations higher than herbivorous and omnivorous species. Also, large carnivorous species presen...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Lacerda LD,Bidone ED,Guimarães AF,Pfeiffer WC

更新日期：1994-01-01 00:00:00

abstract：:Virus titration is an important step required on viral vaccines quality control. "Plaque assay", which employs several types of overlay media, is usually used on viral titrations. In this paper we describe the use of Tapioca as an overlay media. Firstly, the toxicity of Tapioca was tested on Vero cells inoculated or n...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Post PR,de Carvalho R,Brito EC,Galler R

更新日期：1992-01-01 00:00:00

abstract：:This work describes the utilization of two groups of programs in searching for characteristic signals of NMR 13C of steroidal compounds. The first group of programs used data bases with the spectral data and a methodology that enables the choice and the search of substructures. The chemical shifts and multiplicities f...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Lins AP,Furlan M,Gastmans JP,Emerenciano Vde P

更新日期：1991-06-01 00:00:00

abstract：:Twenty-two nitrogen-fixing Bacillus azotofixans strains were shown to produce an inhibition zone against themselves in plate assays. The B. azotofixans type strain P3L-5, chosen for further studies, produced inhibition zones against various Bacillus strains and other bacterial genera. This antibacterial substance was ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Seldin L,Penido EG

更新日期：1990-03-01 00:00:00

abstract：:Membrane protein patterns in SDS-PAGE clearly characterized Azospirillum amazonense, A. brasilense, A. lipoferum, and Herbaspirillum seropedicae. Each species showed also a typical major band with approximate molecular weights (AMWs) of 44, 39.5, 35.5, and 37.5 Kdaltons for the four species respectively. Characteristi...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Dianese JC,Döbereiner J,Dos Santos LT

更新日期：1989-06-01 00:00:00

abstract：:The infrared spectrum (amide I' region) of Kunitz soybean trypsin inhibitor (SBTI) was obtained in D2O solution and resolved into Gaussian components. A prominent broad band centered at 1643 cm-1 is shown on the unresolved spectrum, which is usually assigned to N-deuterated peptide groups in an unordered structure, si...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Ventura MM

更新日期：1989-01-01 00:00:00

abstract：:The amino acid sequence of the "double-headed" trypsin and chymotrypsin inhibitor (BTCI), purified from the cowpea Vigna unguiculata (L.) Walp. cv "Seridó" was determined in our laboratory. Tryptic and chymotryptic peptides were sequenced by the Edman-Gray and Edman-Chang N-terminal manual method as well as the carbox...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Morhy L,Ventura MM

更新日期：1987-01-01 00:00:00

abstract：:Four new N-alkyl-2-mercapto-1-octylamine hydrochlorides were synthesized via the reaction of 1,2-epithio-octane with corresponding amines following by conversion to the hydrochlorides. The disulfides were obtained by oxidation of the respective thiols. Upon biological assay of the products for activity against infecti...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Vieira Filho SA,Nelson DL,Piló-Veloso D

更新日期：1986-12-01 00:00:00

abstract：:Experiments in this paper demonstrate that mitochondrial damage associated to NAD(P)+-induced Ca2+ efflux, is the consequence of inappropriate reaction conditions. The major findings are (i) Added oxaloacetate and acetoacetate readily oxidize NAD(P)H in intact rat liver mitochondria without causing swelling or membran...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Vercesi AE

更新日期：1985-09-01 00:00:00

abstract：:A simple and reliable method for the measurement of sodium and potassium in blood serum without any sample dilution by using flow injection and atomic absorption spectrophotometry is described. A sample throughout of 100 measurements per hour is possible. Matrix problems have not been encountered. The coefficient of v...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Burguera JL,Burguera M,Gallignani M

更新日期：1983-06-01 00:00:00

abstract：:1) The presence of histamine in prickles and lead and stem tissues of Cnidosculus oligandrus (Mull. Arg) Pax & Hoffm (Euphorbiaceae) is reported. 2) Prickles on stems and leaves have larger amounts of histamine, as determined by the isolated guinea-pig ileum and by fluorimetry of the condensation product of the histam...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Cordeior RS,Aragão JB,Morhy L

更新日期：1983-01-01 00:00:00

abstract：:The interaction of urea with lysozyme was studied in the 192-240 nm spectral region by spectrophotometry. The far and middle ultraviolet protein bands records undergo a non-linear "red shift" and "hypochromic effect" under urea titration. These spectral shifts are interpreted basically in terms of decreasing in molar ...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Hampe OG,Hampe MM,Zinner K

更新日期：1981-03-01 00:00:00

abstract：:Some membrane characteristics of the isolated electrocyte of the Sachs organ are presented as function of temperature. Excitability curves are shown for electrocytes kept in standard saline at different temperatures. It is shown that rheobase varies directly with temperature. Apparently membrane resistance varies from...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Esquibel MA,Negreiros J,Gawryszewski LG

更新日期：1980-09-01 00:00:00

abstract：:Properties of L(+) lactate dehydrogenase (LDH) of Electrophorus electricus (L.) electric organ were studied, comparing the substrates pyruvate and lactate. Electric organ LDH is a soluble enzyme with a pH optimum of 7.4 for pyruvate and 9.0 for lactate. The apparent Km was lower for pyruvate (Km = 2.5 X 10(-4) M) than...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Torres-da Matta J,Nery da Matta A,Hassón-Voloch A

更新日期：1976-01-01 00:00:00

abstract：:Brazil and the southeastern United States have faunistic similarities and differences which are of fundamental interest to the environmental scientist. These similarities and differences provide natural experimental organisms and habitats which can provide answers to basic and applied questions. What are the lethal li...

journal_title：Anais da Academia Brasileira de Ciencias

authors： Vernberg FJ,Vernberg WB

更新日期：1976-01-01 00:00:00