Página 1 dos resultados de 419 itens digitais encontrados em 0.002 segundos

A light in the shadow: the use of Lucifer Yellow technique to demonstrate nectar reabsorption

Cardoso-Gustavson, Poliana ; Robazzi Bignelli Valente Aguiar, João ; Ricardo Pansarin, Emerson ; Barros, Fábio de
Fonte: Biblioteca Digital da Produção Intelectual da USP Publicador: Biblioteca Digital da Produção Intelectual da USP
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
26.93%
Abstract Background Nectar reabsorption is a widely known phenomenon, related to the strategy of resource-recovery and also to maintain the nectar homeostasis at the nectary. The method currently performed to demonstrate nectar being reabsorbed involves the use of radioactive tracers applied to the nectary. Although this method works perfectly, it is complex and requires specific supplies and equipment. Therefore, here we propose an efficient method to obtain a visual demonstration of nectar reabsorption, adapting the use of Lucifer Yellow CH (LYCH), a fluorescent membrane-impermeable dye that can enter the vacuole by endocytosis. Results We applied a LYCH solution to the floral nectary (FN) of Cucurbita pepo L., which is a species known for its ability of nectar reabsorption, and to the extrafloral nectary (EFN) of Passiflora edulis Sims which does not reabsorb the secreted nectar. In all tests performed, we observed that LYCH stained the nectary tissues differentially according to the reabsorption ability of the nectary. The treated FN of C. pepo presented a concentrated fluorescence at the epidermis that decreased at the deeper nectary parenchyma, until reaching the vascular bundles, indicating nectar reabsorption in the flowers of the species. In contrast...

ECOLOGICAL ASPECTS AND SEXUAL MATURITY OF A SOUTHWESTERN ATLANTIC POPULATION OF THE PLANKTONIC SHRIMP LUCIFER FAXONI (DECAPODA: SERGESTOMEA)

Alves Teodoro, Sarah de Souza; Farinelli Pantaleao, Joao Alberto; Negreiros-Fransozo, Maria Lucia; Costa, Rogerio Caetano da
Fonte: Crustacean Soc Publicador: Crustacean Soc
Tipo: Artigo de Revista Científica Formato: 422-430
ENG
Relevância na Pesquisa
27.21%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Processo FAPESP: 04/07309-8; Processo FAPESP: 09/54672-4; Processo FAPESP: 10/50188-8; Processo FAPESP: 04/15194-6; The demographic structure and morphological sexual maturity of the shrimp Lucifer faxoni Borradaile, 1915 are described here. The studied specimens came from Ubatuba Bay, in the north littoral of Sao Paulo State, Brazil. In each month of capture, 14 stations, 7 offshore and 7 inshore, were sampled with neuston nets during high tide periods. Relative growth was analyzed by observing the change in growth patterns of certain parts of the body in relation to somite length and total length (TL). Lucifer faxoni was most abundant in offshore regions. The relationship that best showed the size at the onset of the sexual maturity was the length of the 6th somite of the abdomen vs. TL. The external morphology of the petasma evidenced three development stages and such characteristic was also used to estimate sexual maturity for males using the P-50 technique. Our results show there is a preference of L. faxoni for offshore areas, probably explained by differences in abiotic factors. Both estimates of maturity (relative growth and petasma stage) were very similar. In this context...

Uptake of macromolecules by cercariae during skin penetration and transformation to schistosomula (Schistosoma mansoni)

Thornhill,Joyce; Kusel,John; Oliviera,Fabricia Alvisi de; Ribeiro,Fabio; Lima,Symone Fulgêncio; Coelho,Paulo Marcos Zech; McVeigh,Paul; Mattos,Ana Carolina Alves
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/07/2010 EN
Relevância na Pesquisa
26.93%
Here, we observed the uptake of membrane-impermeant molecules by cercariae as they penetrate the skin and are transformed into schistosomula. We propose that membrane-impermeant molecules, Lucifer Yellow, Propidium iodide and Hoechst 33258 enter the parasite through both thenephridiopore and the surface membrane and then diffuse throughout the body of the parasite. We present a hypothesis that the internal cells of the body of the schistosomulum represent a new host-parasite interface, at which skin-derived growth factors may stimulate receptors on internal membranes during transformation of the cercariae into the schistosomulum.

Dendritic thickness: a morphometric parameter to classify mouse retinal ganglion cells

Loopuijt,L.D.; Silva Filho,M. da; Hirt,B.; Vonthein,R.; Kremers,J.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2007 EN
Relevância na Pesquisa
27.21%
To study the dendritic morphology of retinal ganglion cells in wild-type mice we intracellularly injected these cells with Lucifer yellow in an in vitro preparation of the retina. Subsequently, quantified values of dendritic thickness, number of branching points and level of stratification of 73 Lucifer yellow-filled ganglion cells were analyzed by statistical methods, resulting in a classification into 9 groups. The variables dendritic thickness, number of branching points per cell and level of stratification were independent of each other. Number of branching points and level of stratification were independent of eccentricity, whereas dendritic thickness was positively dependent (r = 0.37) on it. The frequency distribution of dendritic thickness tended to be multimodal, indicating the presence of at least two cell populations composed of neurons with dendritic diameters either smaller or larger than 1.8 µm ("thin" or "thick" dendrites, respectively). Three cells (4.5%) were bistratified, having thick dendrites, and the others (95.5%) were monostratified. Using k-means cluster analysis, monostratified cells with either thin or thick dendrites were further subdivided according to level of stratification and number of branching points: cells with thin dendrites were divided into 2 groups with outer stratification (0-40%) and 2 groups with inner (50-100%) stratification...

Estudo do desenvolvimento de Lucifer faxoni Borradaille, 1915 (Crustacea, Decapoda, Sergestidae) através das medidas do somito pré-bucal

Alvarez,Maria Paloma Jimenez
Fonte: Sociedade Brasileira de Zoologia Publicador: Sociedade Brasileira de Zoologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1988 PT
Relevância na Pesquisa
26.93%
Foram estudados os estágios de desenvolvimento de Lucifer faxoni Borradaille ao largo de Santos, São Paulo, Brasil (24º16"S, 46º00W). A maturidade foi estabelecida em relação ao tamanho do somito pré-bucal As estações de maior abundãncia dos espécimes maduros, imaturos e larvais foram determinadas.

Biología de Lucifer faxoni, Borradaile 1915, en Cananéia, Brasil (crustácea, decapoda, luciferidae)

López,Maria T.
Fonte: Instituto Oceanográfico da Universidade de São Paulo Publicador: Instituto Oceanográfico da Universidade de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1966 ES
Relevância na Pesquisa
26.93%
A total of 149 samples coming from Cananéia (25º lat. S) was analysed. The samples are part of Series E, Plankton Section, Oceanographic Institute of São Paulo. They were taken fortnightly from January 1958 to May 1959 at three fixed stations. Altogether 591 males, 573 females and 1426 juveniles of Lucifer faxoni Borradaile 1915 were studied. The results are as follows: 1 - There is a linear correlation between length of neck and total length. 2 - Sexual maturity is reached at 1.18 mm neck length for the males and 1.19 mm for the females. 3 - Sexual maturity peaks occur in summer and autumn. 4 - Sexual maturity stages were established according to fetasma and ovary development respectively for males and females. 5 - Based on neck length, from size groups may be traced in males. First group of smallest specimens, neck length 0.64-0.80 mm, was present in March, November 1958 and January-February 1959. The second group, neck length 0.83-1.16 mm was present all year round, except in July 1958. The third group also occurred all year round, the neck is longer than 1.18 mm. The largest males neck length 1.70-1.92 mm were present in July, September, October, November 1958 and May 1959. 6 - Females may also be classed in four categories. The first group neck length 0.54-0.90 mm was present in February...

Feeding of the planktonic shrimp Lucifer faroni Borradaile, 1915 (Crustacea: Decapoda) in the laboratory

Vega-Pérez,Luz Amelia; Ara,Koichi; Liang,Tsui Hua; Pedreira,Marcelo Mattos
Fonte: Instituto Oceanográfico da Universidade de São Paulo Publicador: Instituto Oceanográfico da Universidade de São Paulo
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1996 EN
Relevância na Pesquisa
37.21%
Feeding behavior of juveniles of the planktonic shrimp Lucifer faxoni Borradaile was studied in the laboratory under light and dark conditions. Newly-hatched nauplii and metanauplii of Artemio were used as prey organisms. The fecding raie of L. foxoni was dependent on prey size and prey density, but was not obviously affected by light or dark conditions. The capture of the prey tended to increase with longer exposure time to prey. The maximum ingestion rate was 17.28 and 13.40 nauplii.L. faxoni .d- , in the light and in the dark conditions, respectively.

Distribution of the Planktonic Shrimp Lucifer (Thompson, 1829) (Decapoda, Sergestoidea) off the Amazon

Melo,NFAC; Neumann-Leitão,S; Gusmão,LMO; Martins Neto,FE; Palheta,GDA
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2014 EN
Relevância na Pesquisa
37.38%
Lucifer faxoni (BORRADAILE, 1915) and L. typus (EDWARDS, 1837) are species first identified in the neritic and oceanic waters off the Amazon. Samplings were made aboard the vessel “Antares” at 22 stations in July and August, 2001 with a bongo net (500-µm mesh size). Hydrological data were taken simultaneously for comparative purposes. L. faxoni was present at thirteen of the fourteen neritic stations analysed, as well as at five of the eight oceanic stations. L. typus was present at three of the fourteen neritic stations and in one of the eight oceanic stations. The highest density of L. faxoni in the neritic province was 7,000 ind.m–3 (St. 82) and 159 ind.m–3 (St. 75) in the oceanic area. For L. typus, the highest density observed was 41 ind.m–3 (St. 64) in the neritic province. In the oceanic province, the highest single density value was recorded at station 75 (5 ind.m–3). Overall, L. faxoni typically presented the highest densities.

Lucifer Yellow slows voltage-gated Na+ current inactivation in a light-dependent manner in mice

Higure, Yoko; Katayama, Yoshimi; Takeuchi, Keita; Ohtubo, Yoshitaka; Yoshii, Kiyonori
Fonte: Blackwell Science Inc Publicador: Blackwell Science Inc
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.93%
Lucifer Yellow CH (LY), a membrane-impermeant fluorescent dye, has been used in electrophysiological studies to visualize cell morphology, with little concern about its pharmacological effects. We investigated its effects on TTX-sensitive voltage-gated Na+ channels in mouse taste bud cells and hippocampal neurons under voltage-clamp conditions. LY applied inside cells irreversibly slowed the inactivation of Na+ currents upon exposure to light of usual intensities. The inactivation time constant of Na+ currents elicited by a depolarization to −15 mV was increased by fourfold after a 5 min exposure to halogen light of 3200 lx at source (3200 lx light), and sevenfold after a 1-min exposure to 12 000 lx light. A fraction of the Na+ current became non-inactivating following the exposure. The non-inactivating current was ≈ 20 % of the peak total Na+ current after a 5 min exposure to 3200 lx light, and ≈ 30 % after a 1 min exposure to 12 000 lx light. Light-exposed LY shifted slightly the current-voltage relationship of the peak Na+ current and of the steady-state inactivation curve, in the depolarizing direction. A similar light-dependent decrease in kinetics occurred in whole-cell Na+ currents of cultured mouse hippocampal neurones. Single-channel recordings showed that exposure to 6500 lx light for 3 min increased the mean open time of Na+ channels from 1.4 ms to 2.4 ms without changing the elementary conductance. The pre-incubation of taste bud cells with 1 mM dithiothreitol...

Movement of fluorescent dyes Lucifer Yellow (LYCH) and carboxyfluorescein (CF) in Medicago truncatula Gaertn. roots and root nodules

Bederska, Magdalena; Borucki, Wojciech; Znojek, Ewa
Fonte: Springer Netherlands Publicador: Springer Netherlands
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.93%
Lucifer Yellow (LYCH) and carboxyfluorescein (CF) served in Medicago truncatula roots and root nodules as the markers of apoplastic and symplastic transport, respectively. The aim of this study was to understand better the water and photoassimilate translocation pathways to and within nodules. The present study shows that in damaged roots LYCH moves apoplastically through the vascular elements but it was not detected within the nodule vascular bundles. In intact roots, the outer cortex was strongly labeled but the dye was not present in the interior of intact root nodules. The inwards movement of LYCH was halted in the endodermis. When the dye was introduced into a damaged nodule by infiltration, it spread only in the cell walls and the intercellular spaces up to the inner cortex. Our research showed that in addition to the outer cortex, the inner tissue containing bacteroid-infected cells is also an apoplastic domain. Our results are consistent with the hypothesis that nodules do not receive water from the xylem but get it and photoassimilates from phloem. A comparison between using LYCH and LYCH followed by glutaraldehyde fixation indicates that glutaraldehyde is responsible for fluorescence of some organelles within root nodule cells. The influence of the fixation on nodule fluorescence has not been reported before but must be taken into consideration to avoid errors. An attempt was made to follow carboxyfluorescein (6(5) CF) translocation from leaflets into roots and root nodules. In root nodules...

Lucifer yellow – an angel rather than the devil

Hanani, Menachem
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.93%
The fluorescent dye Lucifer yellow (LY) was introduced in 1978, and has been extremely useful in studying cell structure and communications. This dye has been used mostly for labelling cells by intracellular injection from microelectrodes. This review describes the numerous applications of LY, with emphasis on the enteric nervous system and interstitial cells of Cajal. Of particular importance is the dye coupling method, which enables the detection of cell coupling by gap junctions.

Testing Fluorescence Lifetime Standards using Two-Photon Excitation and Time-Domain Instrumentation: Rhodamine B, Coumarin 6 and Lucifer Yellow

Kristoffersen, Arne S.; Erga, Svein R.; Hamre, Børge; Frette, Øyvind
Fonte: Springer US Publicador: Springer US
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.5%
Having good information about fluorescence lifetime standards is essential for anyone performing lifetime experiments. Using lifetime standards in fluorescence spectroscopy is often regarded as a straightforward process, however, many earlier reports are limited in terms of lifetime concentration dependency, solvents and other technical aspects. We have investigated the suitability of the fluorescent dyes rhodamine B, coumarin 6, and lucifer yellow as lifetime standards, especially to be used with two-photon excitation measurements in the time-domain. We measured absorption and emission spectra for the fluorophores to determine which wavelengths we should use for the excitation and an appropriate detector range. We also measured lifetimes for different concentrations, ranging from 10−2– 10−6 M, in both water, ethanol and methanol solutions. We observed that rhodamine B lifetimes depend strongly on concentration. Coumarin 6 provided the most stable lifetimes, with a negligible dependency on concentration and solvent. Lucifer yellow lifetimes were also found to depend little with concentration. Finally, we found that a mix of two fluorophores (rhodamine B/coumarin 6, rhodamine B/lucifer yellow, and coumarin 6/lucifer yellow) all yielded very similar lifetimes from a double-exponential decay as the separate lifetimes measured from a single-exponential decay. All lifetime measurements were made using two-photon excitation and obtaining lifetime data in the time-domain using time-correlated single-photon counting.

Can Lucifer Yellow Indicate Correct Permeability of Biological Cell Membrane under An Electric and Magnetic Field?

Pourmirjafari Firoozabadi, Tahereh; Shankayi, Zeinab; Izadi, Azam; Pourmirjafari Firoozabadi, Seyed Mohammad
Fonte: Royan Institute Publicador: Royan Institute
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.93%
The effect of external magnetic and electric fields, in the range of electroporation and magnetoporation, on Lucifer Yellow (LY) fluorescence in the absence of cells is studied. Electric-field-induced quenching and magnetic field-induced increase are observed for fluorescence intensity of LY. Regard to the fact that the variation of field-induced fluorescence, even in the absence of cells, can be observed, the application of LY, as a marker, is debatable in electroporation and magnetoporation techniques.

Archi-Arts participant Barry M. Moore, as the angel Lucifer, Rice Institute

Fonte: Rice University Publicador: Rice University
Relevância na Pesquisa
26.93%
Barry M. Moore dressed as the angel Lucifer. He is wearing white robes and holding a circular object in his hand. Original resource is a black and white photograph.; Archi-Arts was an annual event hosted by the Rice Architectural Society, starting in 1922, serving as a party and a fundraiser for student travel. The Archi-Arts theme in 1961 was "Pandemonium".

Un nuovo contributo allo studio del mito degli angeli neutrali nella "Commedia"

Álvarez Pérez, Xosé Afonso
Fonte: Universidad de Alcalá. Servicio de Publicaciones Publicador: Universidad de Alcalá. Servicio de Publicaciones
Tipo: Artigo de Revista Científica Formato: application/pdf
ITA
Relevância na Pesquisa
27.21%
El artículo analiza el motivo de los ángeles neutrales que aparece en el vestíbulo infernal representado en el canto tercero del Inferno de la Commedia de Dante Alighieri. En primer lugar, se examina la estructura de ese canto y el rol del vestíbulo infernal en el conjunto de la obra. A continuación, se estudian las distintas fuentes que se han barajado para explicar la inclusión en la obra dantesca de estos ángeles que no tomaron partido en la rebelión de Lucifer: teología católica e islámica, literatura apocalíptica, literatura románica y germánica (especialmente de visiones) y motivos folclóricos, prestando especial atención a las opiniones de los comentaristas medievales a la Commedia. Se concluye poniendo en relieve el gran interés del folclore para explicar la creencia en ángeles neutrales y su inclusión por Dante.; This article analyzes the motif of neutral angels that appear in the lobby of Hell represented in the third song of the Dante's Commedia Inferno. First, the article examines the structure of the Inferno and the role of the lobby throughout the book. Then, it reviews the various sources that have been discussed to explain the inclusion of these angels that didn't take part in the rebellion of Lucifer: Catholic and Islamic theology...

iiij [four] Mediaeval Plays: The Creation and Fall of Lucifer / The Taking and Trial of Christ / The Resurrection / The Last Judgement

Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Outros
Publicado em 26/07/1966 EN
Relevância na Pesquisa
26.93%
The Creation and Fall of Lucifer: The Play opens before any creation with God alone. He desires to create 'a place full of plenty' to mould to his liking. The Taking and Trial of Christ: ... is the story Christ's capture and maltreatment, the dilemma of Pilate. The Resurrection: The satisfaction of Pilate, ... in the death of Christ is smashed by the convictions of Pilate's own centurion of the divinity of Christ. The Last Judgment: All are called ... to the judgment of Christ.; Scanned from the original held Special Collections, Barr Smith Library

Espécies do gênero Lucifer Thompson, 1829 no litoral brasileiro (Decapoda: Luciferidae)

D'Incao, Fernando
Fonte: Universidade Federal do Rio Grande Publicador: Universidade Federal do Rio Grande
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
37.38%
The species of the family Luciferidae in Brazil sere revised. They are represented by Lucifer faxoni that occurs in coastal waters including estuaries, and Lucifer typus an ofsshore specie.

Population ecology of the planktonic shrimp Lucifer faxoni Borradaile, 1915 (Crustacea, Sergestoidea, Luciferidae) of the southeastern coast of Brazil

Teodoro, Sarah de Souza Alves; Negreiros-Fransozo, Maria Lúcia; Simões, Sabrina Morilhas; Lopes, Mateus; Costa, Rogerio Caetano da
Fonte: Universidade de São Paulo. Instituto Oceanográfico Publicador: Universidade de São Paulo. Instituto Oceanográfico
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/06/2012 ENG
Relevância na Pesquisa
27.21%
Luciferid shrimps have short life spans and a rapid turnover of generations, engage in sequential spawning, and protect their eggs during incubation. This study investigates the ecology of Lucifer faxoni Borradaile, 1915 in the littoral zone, Ubatuba region, São Paulo. Sampling was conducted monthly from July 2005 to December 2006 using a Renfro net trawled over a distance of 50 m for a total sampling effort of 50 m² at each station. Nine stations were sampled, ranging from 1 to 15 m deep. Three stations each were grouped into zones 1, 2 and 3 (Z1, Z2 and Z3). Monthly values of salinity, temperature and rainfall were recorded at each station. The pre-buccal somite length (SL) of each specimen was measured. The results showed that in shallower zones (Z1 and Z2), 6306 individuals were captured, whereas in the deeper zone (Z3), 3808 specimens were captured, but no significant differences in SL was detected between the specimens from Z1 and Z2 and those from Z3 (ANOVA, p=0.25). The abundance of shrimps did not differ significantly between seasons (Tukey's test, p=0.02) except in the spring. The sex ratio differed significantly over the seasons (χ², p; Este estudo analisa a ecologia de Lucifer faxoni Borradaile, 1915 em Ubatuba...

Feeding of the planktonic shrimp Lucifer faroni Borradaile, 1915 (Crustacea: Decapoda) in the laboratory

Vega-Pérez, Luz Amelia; Ara, Koichi; Liang, Tsui Hua; Pedreira, Marcelo Mattos
Fonte: Universidade de São Paulo. Instituto Oceanográfico Publicador: Universidade de São Paulo. Instituto Oceanográfico
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/01/1996 ENG
Relevância na Pesquisa
37.5%
O comportamento alimentar de espécimens jovens de Lucifer faxoni Borradaile, em laboratório, sob condições de luz e escuro, foi estudado utilizando-se como alimento náuplios recém-eclodidos e metanáuplios de Artemio. Neste estudo a taxa de alimentação de L. faxoni foi influenciada pelo tamanho e concentração da presa, bem como pelo tempo de contato com a mesma. A atividade alimentar de L. faxoni foi maior em condições de luz, quando comparado com as condições de escuro. f- taxa máxima de ingestão calculada foi de 17,28 e 13,40 náuplios.L. faxoni .d- para as condições de luz e escuro, respectivamente.; Feeding behavior of juveniles of the planktonic shrimp Lucifer faxoni Borradaile was studied in the laboratory under light and dark conditions. Newly-hatched nauplii and metanauplii of Artemio were used as prey organisms. The fecding raie of L. foxoni was dependent on prey size and prey density, but was not obviously affected by light or dark conditions. The capture of the prey tended to increase with longer exposure time to prey. The maximum ingestion rate was 17.28 and 13.40 nauplii.L. faxoni .d- , in the light and in the dark conditions, respectively.

Revisão da ocorrência de tubarões etmopteríneos na costa brasileira, com dois novos registros de Etmopterus bigelowi Shirai & Tachikawa, 1993 (Chondrichthyes, Dalatiidae, Etmopterinae); .

Soto, Jules Marcelo Rosa; Museu Oceanográfico do Vale do Itajaí - MOVI/UNIVALE
Fonte: Universidade Federal de Santa Catarina Publicador: Universidade Federal de Santa Catarina
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 01/01/2000 POR
Relevância na Pesquisa
27.38%
A presença e distribuição do gênero Etmopterus em águas brasileiras são discutidas baseando-se em registros de E. bigelowi, E. gracilispinis e E. lucifer. Espécimes depositados em museus brasileiros são citados e dois novos registros de E. bigelowi são apresentados com descrição morfométrica.; Presence and distribution of the genus Etmopterus in Brazilian waters are discussed on the basis of records of E. bigelowi, E. gracilispinis and E. lucifer. Specimens stored in Brazilian museums are cited and two new records of E. bigelowi are presented with morphometric descriptions.