|
|
|
| Registros recuperados: 25 | |
|
|
| Duran Encinas, Yazmin. |
| Crassostrea gigas is a marine invertebrate that inhabits the intertidal zone and therefore, is commonly exposed to multiple environmental stressors, including temperature. In recent years mass mortality events have been reported in Mexico in C. gigas associated with the increase in temperature during the summer. Organisms under thermal stress present an increase in prostaglandins (PG) production by cyclooxygenases (COX), an enzymatic route using arachidonic acid (ARA) present in the phospholipids (FL) of the cell membrane as substrate, but PG can also increase non-enzymatically by reactive oxygen species (ROS) that are produced during increased metabolism. It has been reported that some organisms exposed to stress accumulate a higher concentration of ARA... |
| Tipo: Text |
Palavras-chave: Arachidonic acid; Stress; Phospholipid; Isotope; Mollusk; Temperature; Triglyceride; Prostaglandin. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00620/73193/72387.pdf |
| |
|
|
| Jemaa, Mohamed; Morin, Nathalie; Cavelier, Patricia; Cau, Julien; Strub, Jean Marc; Delsert, Claude. |
| Long-lived animals show a non-observable age-related decline in immune defense, which is provided by blood cells that derive from self-renewing stem cells. The oldest living animals are bivalves. Yet, the origin of hemocytes, the cells involved in innate immunity, is unknown in bivalves and current knowledge about mollusk adult somatic stem cells is scarce. Here we identify a population of adult somatic precursor cells and show their differentiation into hemocytes. Oyster gill contains an as yet unreported irregularly folded structure (IFS) with stem-like cells bathing into the hemolymph. BrdU labeling revealed that the stem-like cells in the gill epithelium and in the nearby hemolymph replicate DNA. Proliferation of this cell population was further... |
| Tipo: Text |
Palavras-chave: Hematopoiesis; Adult somatic progenitor cells; Hemocytes; Mollusk; Marine invertebrates. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00197/30802/29172.pdf |
| |
|
|
| Poirier, Aurore C.; Schmitt, Paulina; Rosa, Rafael D.; Vanhove, Audrey S.; Kieffer-jaquinod, Sylvie; Rubio, Tristan P.; Charriere, Guillaume M.; Destoumieux-garzon, Delphine. |
| Although antimicrobial histones have been isolated from multiple metazoan species, their role in host defense has long remained unanswered. We found here that the hemocytes of the oyster Crassostrea gigas release antimicrobial H1-like and H5-like histones in response to tissue damage and infection. These antimicrobial histones were shown to be associated with extracellular DNA networks released by hemocytes, the circulating immune cells of invertebrates, in response to immune challenge. The hemocyte-released DNA was found to surround and entangle vibrios. This defense mechanism is reminiscent of the neutrophil extracellular traps (ETs) recently described in vertebrates. Importantly, oyster ETs were evidenced in vivo in hemocyte-infiltrated interstitial... |
| Tipo: Text |
Palavras-chave: Antimicrobial Peptide (AMP); DNA; Innate Immunity; Invertebrate; Reactive Oxygen Species (ROS); NET; Mollusk. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00217/32866/31784.pdf |
| |
|
|
| Waissel,I.; Mineo,J.R.; Natal,C.L.. |
| In the present investigation we studied some behavioral and immunological parameters of adult gastropod mollusk, Biomphalaria tenagophila, which have been reproducing for several generations under laboratory conditions. One group of gastropods was kept on a 14-h light/10-h dark cycle, corresponding to a regular circadian cycle, and another group was exposed to continuous light for 48 h. Animals were studied along (behavioral groups) or immediately after (immunological groups) 48 h of regular circadian cycle or continuous light conditions. Stopping/floating, dragging and sliding were the behavioral aspects considered (N = 20 for regular cycle; N = 20 for continuous illumination) and number of hemocytes/µl hemolymph was the immunological parameter studied (N... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Circadian cycle; Mollusk; Neuroimmunology; Stress; Behavior. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001200014 |
| |
|
|
| Bigot, Laetitia; Zatylny-gaudin, Celine; Rodet, Franck; Bernay, Benoit; Boudry, Pierre; Favrel, Pascal. |
| Gonadotropin-releasing hormone (GnRH), a key neuropeptide regulating reproduction in vertebrates has now been characterized in a number of non-vertebrate species. Despite the demonstration of its ancestral origin, the structure and the function of this family of peptides remain poorly known in species as distant as lophotrochozoans. In this study, two GnRH-related peptides (Cg-GnRH-a and CgGnRH-G) were characterized by mass spectrometry from extracts of the visceral ganglia of the Pacific oyster Crassostrea gigas. These peptides showed a high degree of sequence identity with GnRHs of other mollusks and annelids and to a lesser extent with those of vertebrates or with AKH and corazonins of insects. Both the mature peptides and the transcript encoding the... |
| Tipo: Text |
Palavras-chave: Mollusk; Bivalve; Oyster; Neuroendocrinology; Reproduction; GnRH. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00079/19003/17477.pdf |
| |
|
|
| Cano, Irene; Ryder, David; Webb, Steve C.; Jones, Brian J.; Brosnahan, Cara L.; Carrasco, Noelia; Bodinier, Barbara; Furones, Dolors; Pretto, Tobia; Carella, Francesca; Chollet, Bruno; Arzul, Isabelle; Cheslett, Deborah; Collins, Evelyn; Lohrmann, Karin B.; Valdivia, Ana L.; Ward, Georgia; Carballal, María J.; Villalba, Antonio; Marigómez, Ionan; Mortensen, Stein; Christison, Kevin; Kevin, Wakeman C.; Bustos, Eduardo; Christie, Lyndsay; Green, Matthew; Feist, Stephen W.. |
| Intracellular microcolonies of bacteria (IMC), in some cases developing large extracellular cysts (bacterial aggregates), infecting primarily gill and digestive gland, have been historically reported in a wide diversity of economically important mollusk species worldwide, sometimes associated with severe lesions and mass mortality events. As an effort to characterize those organisms, traditionally named as Rickettsia or Chlamydia-like organisms, 1950 specimens comprising 22 mollusk species were collected over 10 countries and after histology examination, a selection of 99 samples involving 20 species were subjected to 16S rRNA gene amplicon sequencing. Phylogenetic analysis showed Endozoicomonadaceae sequences in all the mollusk species analyzed.... |
| Tipo: Text |
Palavras-chave: Mollusk; OTU; Endozoicomonas; Chlamydiae; Mycoplasma; Francisella; Lucinoma; Ridgeia. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00658/77032/78322.pdf |
| |
|
| |
|
|
| Pires-Júnior,Amilcar Nogueira; Hattori,Gustavo Yomar; Sant'Anna,Bruno Sampaio. |
| ABSTRACT This study evaluated the biomass gain, specific growth rate, absolute weight gain, and survival rate of the gastropod Pomacea dolioides cultivated in different stocking densities. To perform the experiment, samples were collected in March and June 2015. A total of 40 adult specimens were collected in the Jauary neighborhood (03°08′19.9"S, 58°27′32.5"W), municipality of Itacoatiara, AM, Brazil. They were kept in the laboratory for breeding to obtain the young P. dolioides, which were distributed into tanks containing 4 L of water and an aeration system, in three densities: 2.5 animals/L, 5 animals/L, and 10 animals/L, and were fed fish ration (34% gross protein). The specimens were measured for shell length and weight every fifteen days. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture; Growth; Mollusk; Stock enhancement. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100153 |
| |
|
|
| Rondon Sallan, Rodolfo; Grunau, Christoph; Fallet, Manon; Charlemagne, Nicolas; Sussarellu, Rossana; Chaparro, Cristian; Montagnani, Caroline; Mitta, Guillaume; Bachere, Evelyne; Akcha, Farida; Cosseau, Celine. |
| Environmental epigenetic is an emerging field that studies the cause-effect relationship between environmental factors and heritable trait via an alteration in epigenetic marks. This field has received much attentions since the impact of environmental factors on different epigenetic marks have been shown to be associated with a broad range of phenotypic disorders in natural ecosystems. Chemical pollutants have been shown to affect immediate epigenetic information carriers of several aquatic species but the heritability of the chromatin marks and the consequences for long term adaptation remain open questions. In this work, we investigated the impact of the diuron herbicide on the DNA methylation pattern of spat from exposed Crassotrea gigas genitors. This... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Mollusk; DNA methylation; Herbicide; Epigenetic. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00602/71413/69895.pdf |
| |
|
|
| Fallet, Manon; Luquet, Emilien; David, Patrice; Cosseau, Céline. |
| Recent insights in evolutionary biology have shed light on epigenetic variation that interacts with genetic variation to convey heritable information. An important characteristic of epigenetic changes is that they can be produced in response to environmental cues and passed on to later generations, potentially facilitating later genetic adaptation. While our understanding of epigenetic mechanisms in vertebrates is rapidly growing, our knowledge about invertebrates remains lower, or is restricted to model organisms. Mollusks in particular, are a large group of invertebrates, with several species important for ecosystem function, human economy and health. In this review, we attempt to summarize the literature on epigenetic and intergenerational studies in... |
| Tipo: Text |
Palavras-chave: Mollusk; Epigenetic; Intergenerational effect; Phenotypic plasticity; Adaptation. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00590/70163/68170.pdf |
| |
|
|
| Gonzalez, Marcelo; Gueguen, Yannick; Destoumieux Garzon, Delphine; Romestand, Bernard; Fievet, Julie; Pugniere, M; Roquet, F; Escoubas, Jean-michel; Vandenbulcke, F; Levy, O; Saune, Laure; Bulet, P; Bachere, Evelyne. |
| A cDNA sequence with homologies to members of the LPS-binding protein and bactericidal/permeability-increasing protein (BPI) family was identified in the oyster Crassostrea gigas. The recombinant protein was found to bind LIPS, to display bactericidal activity against Escherichia coli, and to increase the permeability of the bacterial cytoplasmic membrane. This indicated that it is a BPI rather than an LPS-binding protein. By in situ hybridization, the expression of the C gigas BPI (Cg-bpi) was found to be induced in hemocytes after oyster bacterial challenge and to be constitutive in various epithelia of unchallenged oysters. Thus, Cg-bpi transcripts were detected in the epithelial cells of tissues/organs in contact with the external environment (mantle,... |
| Tipo: Text |
Palavras-chave: Oyster innate immunity; Mollusk; Hemocyte; Epithelia; Antimicrobial. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3564.pdf |
| |
|
|
| Andreazzi, Márcia Aparecida; Gasparotto, Francielli; Paccola, Edneia Aparecida de Souza; Silva, Cleiltan Novais da; Rodrigues, Aparecida de Fatima Cracco; Lizama, Maria de los Angeles Perez. |
| Achatina fulica, known as Giant African Snail (GAS), was introduced in Brazil as a substitute for the European escargot, Helix aspersa maxima. However, its cultivation was abandoned and the mollusk became an invasive species, found throughout Brazil and causing damage to health and the environment. In this context, this study analyzed the knowledge of the population about the damage caused by GAS, seeking to reveal a regional scenario on this issue. This exploratory and cross-sectional study was conducted by means of a questionnaire applied to 150 people, which obtained sociodemographic characteristics of respondents and specific responses about the knowledge and handling of GAS. The results showed that most of the respondents know the snail and are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mollusk; Introduced species; Environment; Social study.. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/35569 |
| |
|
| |
|
|
| De Lorgeril, Julien; Escoubas, Jean Michel; Loubiere, Vincent; Pernet, Fabrice; Le Gall, Patrik; Vergnes, Agnes; Aujoulat, Fabien; Jeannot, Jean-luc; Jumas-bilak, Estelle; Got, Patrice; Gueguen, Yannick; Destoumieux-garzon, Delphine; Bachere, Evelyne. |
| Since 2008, juvenile Crassostrea gigas oysters have suffered from massive mortalities in European farming areas. This disease of complex etiology is still incompletely understood. Triggered by an elevated seawater temperature, it has been associated to infections by a herpes virus named OsHV-1 as well as pathogenic vibrios of the Splendidus clade. Ruling out the complexity of the disease, most of our current knowledge has been acquired in controlled experiments. Among the many unsolved questions, it is still ignored what role immunity plays in the capacity oysters have to survive an infectious episode. Here we show that juvenile oysters susceptible to the disease mount an inefficient immune response associated with microbial permissiveness and death. We... |
| Tipo: Text |
Palavras-chave: Host pathogen interaction; Innate immunity; Invertebrate; Mollusk; In situ mortality; Total bacteria; Crassostrea gigas. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00433/54470/55845.pdf |
| |
|
|
| Collado,Gonzalo A; Brown,Donald I. |
| This study describes the microscopic anatomy of the reproductive systems of the keyhole limpets Fissurella latimarginata and Fissurella cumingi to test the existence of a possible isolating reproductive mechanism of morphophysiological type between species, and consequently to determine if the findings provide a valid taxonomic characteristic to distinguish these sympatric species. The results show that in both species the reproductive system is intimately associated with the excretory system. The gonad has a septa organization, and is connected with the distal portion of the right kidney by means of a renopericardial duct which functions as a genital duct. The gametes are evacuated to the mantle cavity through the right kidney opening. Besides transport... |
| Tipo: Journal article |
Palavras-chave: Mollusk; Fissurellidae; Reproductive system; Microscopic anatomy; Taxonomy. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200012 |
| |
|
| |
|
|
| Gueguen, Yannick; Romestand, Bernard; Fievet, Julie; Schmitt, Paulina; Destoumieux Garzon, Delphine; Franck, Vandenbulcke; Philippe, Bulet; Bachere, Evelyne. |
| A cDNA sequence that encodes a 61-amino acid polypeptide precursor with homologies to proline-rich antimicrobial peptides (AMPs) was identified in the oyster Crassostrea gigas. After release of a hydrophobic signal peptide. the resulting 37-amino acid peptide, Cg-Prp, is composed of an acidic region and a cationic proline-rich region. To evaluate the biological properties of Cg-Prp, multiple proline-rich peptides corresponding to putative processing of the full-length Cg-Prp were synthesized. A limited antimicrobial activity was observed for two of them, which also showed strong synergistic antimicrobial activity with Cg-Def, a defensin from C gigas. To our knowledge, this is the first evidence of synergy between a defensin and another AMP in an... |
| Tipo: Text |
Palavras-chave: Antimicrobial peptide; Mollusk; Synergy; Invertebrate; Innate immunity; Pacific oyster. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6232.pdf |
| |
|
|
| Bianchini,Adriane Erbice; Cunha,Jessyka Arruda da; Brusque,Isabel Cristina Markowski; Pinheiro,Carlos Garrido; Schindler,Bianca; Heinzmann,Berta Maria; Baldisserotto,Bernardo. |
| ABSTRACT: This study evaluated the potential relaxing and/or molluscicidal effects of eugenol and essential oils of Origanum majorana, Ocimum americanum, Hesperozygis ringens, and Piper gaudichaudianum in the gastropod Pomacea canaliculata. Compounds were tested at concentrations of 100, 250, 500, and 750µL L-1 to evaluate the relaxing effects. In the second experiment, animals were exposed to 10, 25, and 50µL L-1 of essential oils of H. ringens and P. gaudichaudianum for a period of 24h for the evaluation of molluscicidal effects. Eugenol and essential oils of O. majorana and O. americanum showed relaxing effects at ≥250µL L-1, but the essential oils of H. ringens and P. gaudichaudianum did not promote relaxing or molluscicidal effects within the times... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anesthesia; Golden apple snail; Mollusk; Ocimum americanum; Origanum majorana. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001000403 |
| |
|
|
| Arruda,Eliane P. de; Amaral,A. Cecilia Z.. |
| The spatial distribution of mollusks in the intertidal zone was examined monthly from August 1995 through July 1997, in Enseada, Barra Velha and Araçá beaches in southeastern of Brazil. One study sector was selected in Enseada and Barra Velha, and two sectors in Araçá (Araçá I and Araçá II). The sectors were 10 m wide and equivalent in length to the width of the intertidal zone. Each sector was divided into three horizontal levels: lower, middle and upper, where the samples were taken with a cylinder corer with a base area of 0.16 m². In order to characterize the intertidal environment in these areas, some environmental variables were analyzed. In general, the mollusks were distributed in the sectors as follows: Enseada - Olivella minuta (Link, 1807) in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caraguatatuba Bay; Intertidal zone; Mollusk; São Sebastião Channel; Sheltered beach; Spatial distribution. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000200020 |
| |
|
|
| Ferreira,Alexandre Gomes; Machado,André Luís dos Santos; Zalmon,Ilana Rosental. |
| Heavy metal (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) concentrations were studied in Perna perna from three beaches (Barra do Furado, Buena and Ponta do Retiro) on the northern coast of Rio de Janeiro State by ICP-AES. The average concentration was 0.3 ± 0.04 (Cd); 1.9 ± 0.6 (Cr); 6.1 ± 0.7 (Cu); 1,130 ± 113 (Fe); 22 ± 3.2 (Mn); 9.3 ± 4.6 (Ni); 0.4 ± 0.2 (Pb); 44 ± 5.8 (Zn) µg.g-1 dry weight. There were no significant difference for almost all the studied metals in relation to sex. Although, significant spatial variations (p < 0.05) occurred for Cr, Pb and Ni with higher values for Barra do Furado. Temporal variations were significant (p < 0.05) at the three beaches, however, no trends of accumulation were observed. The metal concentrations were similar to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Mollusk; Spatial variation; Temporal variation. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000200020 |
| |
| Registros recuperados: 25 | |
|
|
|
