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1.
Fish Shellfish Immunol ; 127: 659-665, 2022 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-35779813

RESUMO

The infection of the kinetoplastid flagellate Azumiobodo hoyamushi causes soft tunic syndrome that often results in mass mortality in the aquaculture of the edible ascidian Halocynthia roretzi. In the diseased ascidian individuals, the flagellates are exclusively found in the tunic matrix that entirely cover the epidermis, and never invade into internal tissues, such as a mantle. The present study for the first time demonstrated that the ascidian blood plasma and hemolymph have an activity to agglutinate and disintegrate the flagellates, suggesting the innate immunity protects the internal tissue from the invasion of A. hoyamushi. This activity is indifferent between the healthy and the diseased individuals. Allo-specific recognition and cytotoxic reaction among ascidian hemocytes, so-called contact reaction, occur among the individuals of healthy-healthy, healthy-diseased, and diseased-diseased combination, and therefore, the hemocytes from diseased individuals still retain the allo-reactivity. Moreover, the allo-reactive combinations are not changed under the presence of the flagellates, indicating the flagellates neither suppress nor induce the effector system of the contact reaction. These results suggest that the infection of A. hoyamushi does not impair the innate immunity in the ascidian hemolymph.


Assuntos
Hemócitos , Hemolinfa , Imunidade Inata , Urocordados , Animais , Hemócitos/imunologia , Hemolinfa/imunologia , Urocordados/imunologia
2.
Int J Syst Evol Microbiol ; 66(2): 580-586, 2016 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-26554606

RESUMO

A novel Gram-stain-negative, rod-shaped (0.3 × 4-6 µm), non-flagellated, aerobic strain with gliding motility, designated JBKA-6T, was isolated in 1991 from a yellowtail fish, Seriola quinqueradiata, showing symptoms of bacterial haemolytic jaundice. 16S rRNA gene sequence analysis showed that strain JBKA-6T was related most closely to members of the family Flavobacteriaceae in the phylum 'Bacteroidetes'. Furthermore, based on gyrB gene sequence analysis, JBKA-6T was classified into a single clade within the order Flavobacteriales, which was distinct from the known clades of the families Flavobacteriaceae, Blattabacteriaceae and Cryomorphaceae. The predominant isoprenoid quinone was identified as MK-6 (97.9 %), and the major cellular fatty acids (>10 %) were C14 : 0 and iso-C15 : 0. The main polar lipids were phosphatidylethanolamine, three unidentified phospholipids, two unidentified aminophospholipids and two unidentified polar lipids. The DNA G+C content of JBKA-6T, as derived from its whole genome, was 33.4 mol%. The distinct phylogenetic position and phenotypic traits of strain JBKA-6T distinguish it from all other described species of the phylum 'Bacteroidetes', and therefore it was concluded that strain JBKA-6T represents a new member of the phylum 'Bacteroidetes', and the name Ichthyobacterium seriolicida gen. nov., sp. nov. is proposed. The type strain of Ichthyobacterium seriolicida is JBKA-6T ( = ATCC BAA-2465T = JCM 18228T). We also propose that Icthyobacterium gen. nov. is the type genus of a novel family, Ichthyobacteriaceae fam. nov.


Assuntos
Bacteroidetes/classificação , Perciformes/microbiologia , Filogenia , Animais , Técnicas de Tipagem Bacteriana , Bacteroidetes/genética , Bacteroidetes/isolamento & purificação , Composição de Bases , DNA Bacteriano/genética , Ácidos Graxos/química , Doenças dos Peixes/microbiologia , Icterícia/microbiologia , Fosfatidiletanolaminas/química , Fosfolipídeos/química , RNA Ribossômico 16S/genética , Análise de Sequência de DNA , Vitamina K 2/análogos & derivados , Vitamina K 2/química
3.
Vet Immunol Immunopathol ; 153(1-2): 83-90, 2013 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-23489657

RESUMO

Edwardsiella tarda is an intracellular pathogen that causes edwardsiellosis in fish. Although cell-mediated immunity and innate immunity play a major role in protection against intracellular bacterial infection in mammals, their importance in protecting fish against E. tarda infection remain unclear. In this study, we examined cell-mediated and humoral immune responses in ginbuna crucian carp (Carassius auratus langsdorfii) after E. tarda infection. Innate immunity was observed to be the principal immune system for eliminating the majority of E. tarda, while a proportion of the bacteria might be resistant to its bactericidal activity. Bacterial clearance in kidney and spleen was also observed following higher cytotoxic activities of cytotoxic T lymphocytes (CTLs) and increased numbers of CD8α(+) cells, suggesting that CTLs might contribute to the elimination of E. tarda-infected cells with specific cytotoxicity. On the other hand, E. tarda-specific antibody titers did not increase until after bacterial clearance, indicating that induction of humoral immunity would be too late to provide protection against infection. Overall, these data suggest that both cell-mediated immunity and innate immunity may play important roles in the protection against intracellular bacterial infection, as they do in mammals. Our study would also contribute toward the understanding of immune responses that provide protection against other intracellular pathogens.


Assuntos
Carpas/imunologia , Edwardsiella tarda , Infecções por Enterobacteriaceae/veterinária , Doenças dos Peixes/imunologia , Carpa Dourada/imunologia , Imunidade Adaptativa , Animais , Anticorpos Antibacterianos/sangue , Linfócitos T CD8-Positivos/imunologia , Infecções por Enterobacteriaceae/imunologia , Interferon gama/genética , Rim/imunologia , Fator de Necrose Tumoral alfa/genética
4.
Biosci Biotechnol Biochem ; 77(2): 345-52, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23391929

RESUMO

Lactate dehydrogenase (LDH)-release assay was applied to estimate the toxic potential of harmful algal species at the cellular level. African green monkey kidney (Vero), yellowtail fin epithelia (MJF), and rainbow trout gill (RTgill-W1) cells were used as target cells. A live cell suspension of Karenia mikimotoi (SUO-1) induced the release of LDH from these cell lines, while the activity of another strain, FUK, was much lower. The cell-free culture supernatants and ruptured cell suspensions of both strains of K. mikimotoi were less effective on LDH-release assay. Exposure experiments against abalone and shrimp revealed that SUO-1 showed much stronger lethal effects on these organisms than FUK. Among six phytoplankton species, three species known to be harmful algal species induced the release of LDH to different extents depending on the cell line, whereas the other three species, known to be non-toxic, showed no effects on any cell lines. These results suggest that LDH-release assay is a useful micro-plate assay for estimation of the toxic potential of harmful phytoplankton.


Assuntos
Nadadeiras de Animais/enzimologia , Citotoxinas/toxicidade , Diatomáceas/química , Dinoflagellida/química , Brânquias/enzimologia , L-Lactato Desidrogenase/análise , Fitoplâncton/química , Nadadeiras de Animais/citologia , Nadadeiras de Animais/efeitos dos fármacos , Animais , Bioensaio , Chlorocebus aethiops , Citotoxinas/isolamento & purificação , Brânquias/citologia , Brânquias/efeitos dos fármacos , Proliferação Nociva de Algas , L-Lactato Desidrogenase/metabolismo , Oncorhynchus mykiss , Células Vero
5.
Fish Shellfish Immunol ; 29(4): 687-93, 2010 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-20633656

RESUMO

We evaluated the tissue persistence and live vaccine efficacy of five avirulent Edwardsiella tarda strains (E22, SU100, SU117, SU138, and SU244) isolated from the Japanese eel (Anguilla japonica) and from the environment. The live vaccines, containing a single strain, were injected intraperitoneally into Japanese flounder (Paralichthys olivaceus). Viable bacteria from all the strains (excluding SU100) were recovered from trunk-kidney tissue 28 d post-injection. Japanese flounder inoculated with E22 had the highest relative percentage survival (RPS = 45%) in an artificial challenge with virulent E. tarda (NUF806). The serum of E22-vaccinated fish had a significantly higher agglutination titer against NUF806. In contrast, there was little or no increase in the agglutination titer of the fish that were inoculated with the remaining avirulent strains. Injection with avirulent E. tarda increased the expression of cytokine genes, including interleukin-1beta (IL-1beta), type 1 interferon (IFN), and IFN-gamma in head-kidney of the Japanese flounder.


Assuntos
Vacinas Bacterianas/imunologia , Edwardsiella tarda/patogenicidade , Infecções por Enterobacteriaceae/veterinária , Doenças dos Peixes/prevenção & controle , Linguado , Animais , Carga Bacteriana , Sobrevivência Celular , Células Cultivadas , Infecções por Enterobacteriaceae/imunologia , Infecções por Enterobacteriaceae/mortalidade , Infecções por Enterobacteriaceae/prevenção & controle , Doenças dos Peixes/imunologia , Doenças dos Peixes/microbiologia , Doenças dos Peixes/mortalidade , Fagócitos/citologia , Fagócitos/microbiologia
6.
Appl Environ Microbiol ; 76(1): 161-8, 2010 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-19915032

RESUMO

Cyprinid herpesvirus 3 (CyHV-3), a lethal DNA virus that spreads in natural lakes and rivers, infects common carp and koi. We established a quantification method for CyHV-3 that includes a viral concentration method and quantitative PCR combined with an external standard virus. Viral concentration methods were compared using the cation-coated filter and ultrafiltration methods. The recovery of virus-like particles was similar for the two methods (cation-coated filter method, 44%+/-19%, n=3; ultrafiltration method, 50%+/-3%, n=3); however, the former method was faster and more suitable for routine determinations. The recovery of seeded CyHV-3 based on the cation-coated filter method varied by more than 3 orders of magnitude among the water samples. The recovery yield of CyHV-3 was significantly correlated with that of the seeded lambda phage, and the average ratio of lambda to the CyHV-3 recovery yield was 1.4, indicating that lambda is useful as an external standard virus for determining the recovery yield of CyHV-3. Therefore, to quantify CyHV-3 in environmental water, a known amount of lambda was added as an external standard virus to each water sample. Using this method, CyHV-3 DNA was detected in 6 of the 10 (60%) types of environmental water tested; the highest concentration of CyHV-3 DNA was 2x10(5) copies liter(-1). The lowest recovery limit of CyHV-3 DNA was 60 copies liter(-1). This method is practical for monitoring CyHV-3 abundance in environmental water.


Assuntos
Carpas/virologia , Herpesviridae/isolamento & purificação , Carga Viral , Virologia/métodos , Microbiologia da Água , Animais , Bacteriófago lambda/isolamento & purificação , Filtração/métodos , Reação em Cadeia da Polimerase/métodos , Padrões de Referência , Sensibilidade e Especificidade , Ultrafiltração/métodos
7.
J Aquat Anim Health ; 21(2): 124-32, 2009 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-19873834

RESUMO

Phylogenetic analysis of nine strains of Edwardsiella ictaluri and eight strains of E. tarda (six typical motile strains and two atypical nonmotile strains) isolated from diseased fish was performed using the upstream region of the fimbrial gene cluster. Strains of E. ictaluri and E. tarda were significantly clustered into separate groups. Moreover, atypical E. tarda strains were clustered into a different group from the other strains. Three polymerase chain reaction (PCR) primer sets for differential detection of E. ictaluri as well as typical and atypical E. tarda were developed from the respective characteristic sequences. Strains of E. ictaluri, typical E. tarda, and atypical E. tarda were specifically detected by PCR using each primer set. No amplifications were observed after the use of these three primer sets with 25 other bacterial species, including fish pathogens. In addition, the three primer sets were able to detect the DNA of each target species from fish kidney and liver artificially infected with E. ictaluri or E. tarda.


Assuntos
Edwardsiella ictaluri/classificação , Edwardsiella tarda/classificação , Fímbrias Bacterianas/genética , Genes Bacterianos , Reação em Cadeia da Polimerase/métodos , Edwardsiella ictaluri/genética , Edwardsiella tarda/genética , Fímbrias Bacterianas/classificação , Filogenia , Especificidade da Espécie
8.
J Vet Diagn Invest ; 21(4): 504-9, 2009 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-19564499

RESUMO

Edwardsiella tarda is a fish pathogen that causes systemic infections in fresh water and marine fish. Determining the antigenic proteins is important for the development of an immunodiagnostic tests and a vaccine for effective infection control in fish. In the current study, antigens were detected by immunoblotting and affinity column chromatography using a Japanese flounder (Paralichthys olivaceus) antibody produced by experimental infection with E. tarda. GroEL, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), outer membrane protein A, filament protein, 30S ribosomal protein S6, 50S ribosomal protein L9, cold shock protein, and carbon storage protein were identified as antigens of E. tarda through biochemical analyses of the molecular weights, isoelectric points, and N-terminal amino-acid sequences. These proteins can be easily detected in flounder infected with E. tarda and are potential diagnostic markers.


Assuntos
Anticorpos Antibacterianos/sangue , Antígenos de Bactérias/imunologia , Edwardsiella tarda/imunologia , Doenças dos Peixes/microbiologia , Linguado/sangue , Animais , Doenças dos Peixes/sangue , Doenças dos Peixes/imunologia , Imunoglobulina M/sangue , Imunoglobulina M/imunologia
9.
Microbiol Immunol ; 53(3): 131-9, 2009 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19302523

RESUMO

Edwardsiella tarda, which is known to be the causative agent of edwardsiellosis in freshwater and marine fish, has two motility phenotypes. Typical strains exhibiting motility are isolated mainly from freshwater fish and Japanese flounder. Atypical strains exhibiting non-motility are isolated mainly from marine fish, with the exception of Japanese flounder. Subtractive hybridization was performed to identify genomic differences between these two phenotypes. Two fragments which showed homology to potential virulence factors were isolated from atypical strains: the autotransporter adhesin AIDA and a component of T6SS. We analysed DNA sequences of about 5 kbp containing these fragments and identified two partial ORF, and ORF encoding for other components of T6SS. The predicted amino acid sequences showed remarkably low homology to components of T6SS reported in the typical E. tarda strain PPD130/91. Furthermore, the organization of these ORF was different from the gene cluster of the typical E. tarda strain. AIDA and T6SS may therefore be associated with different pathogenicity in typical and atypical E. tarda hosts.


Assuntos
Adesinas Bacterianas/genética , DNA Bacteriano/genética , Edwardsiella tarda/genética , Edwardsiella tarda/patogenicidade , Proteínas de Membrana Transportadoras/genética , Hibridização de Ácido Nucleico/métodos , Fatores de Virulência/genética , Animais , Proteínas de Bactérias/genética , Edwardsiella tarda/isolamento & purificação , Edwardsiella tarda/fisiologia , Peixes/microbiologia , Japão , Locomoção , Dados de Sequência Molecular , Fases de Leitura Aberta , Análise de Sequência de DNA
10.
Vet Microbiol ; 135(3-4): 261-6, 2009 Mar 30.
Artigo em Inglês | MEDLINE | ID: mdl-19013729

RESUMO

The disease caused by cyprinid herpesvirus 3 (CyHV-3) brings catastrophic damages to cultivated carp and koi and to natural carp populations; however, the dynamics of the virus in environmental waters are unclear. In July 2007, CyHV-3 DNA was detected in a dead common carp collected from the Yura River in Kyoto Prefecture, Japan, and this was followed by mass mortality. We collected water samples at eight sites along the Yura River for 3 months immediately after confirmation of the disease outbreak and attempted to detect and quantify CyHV-3 DNA in the water samples using molecular biological methods. The virus concentration was carried out by the cation-coated filter method, while the purification of DNA from the samples was achieved using phenol-chloroform extraction and a commercial DNA extraction kit. CyHV-3 was detected by PCR using six sets of conditions, three sets of primers (SphI-5, AP, and B22Rh exon 1), and two volumes of template DNA, and was quantified using real-time PCR. Our results indicate broader distribution of CyHV-3, even though dead fish were found only in a limited area; moreover, the virus was present at high levels in the river not only during the mass mortality caused by the disease but also for at least 3 months after the end of mass mortality. Our results suggest the possibility of infection by CyHV-3 via environmental water. The sequences of CyHV-3 collected from the Yura River matched perfectly with that of the CyHV-3 Japanese strain, suggesting that they share the same origin.


Assuntos
Cyprinidae/virologia , DNA Viral/genética , Doenças dos Peixes/virologia , Água Doce/virologia , Infecções por Herpesviridae/veterinária , Varicellovirus/genética , Varicellovirus/isolamento & purificação , Animais , Primers do DNA , DNA Viral/isolamento & purificação , Surtos de Doenças , Doenças dos Peixes/epidemiologia , Infecções por Herpesviridae/epidemiologia , Japão/epidemiologia , Reação em Cadeia da Polimerase/métodos , Rios/virologia , Estações do Ano , Sensibilidade e Especificidade , Temperatura
11.
Uirusu ; 55(1): 145-51, 2005 Jun.
Artigo em Japonês | MEDLINE | ID: mdl-16308541

RESUMO

Koi herpesvirus (KHV) disease emerged at the late 1990s, and has rapidly spread to the world. In Japan, KHV disease first occurred at October 2003. The disease resulted in mass mortality of wild carp as well as cultured carp. Until now, KHV-infected carp were found in 42 out of 47 prefectures in Japan. Only carp Cyprinus carpio is susceptible to KHV, while goldfish, closely-related species to carp, is not. The affected carp swim lethargically. Sunken eyes and gill necrosis are frequently noticed, but no marked internal signs are observed. Optimal water temperature for the disease is 18-23 degrees C. Under 13 degrees C or over 28 degrees C, no death occurs. Keep at over 30 degrees C cures KHV disease, but can make the fish latent carriers. Because the fish do not get acquired immunity against KHV disease under low water temperature, the disease recurs with increase of water temperature. Isolation of KHV is difficult. KHV disease is diagnosed through epidemiological investigation, disease signs and PCR detection of KHV DNA. Vaccine development is ongoing for restart of culturing carp at KHV-contaminated places.


Assuntos
Carpas/virologia , Doenças dos Peixes/virologia , Infecções por Herpesviridae/veterinária , Infecções por Herpesviridae/virologia , Animais , DNA Viral/análise , Surtos de Doenças , Doenças dos Peixes/diagnóstico , Doenças dos Peixes/epidemiologia , Herpesviridae/genética , Infecções por Herpesviridae/diagnóstico , Infecções por Herpesviridae/epidemiologia , Japão , Reação em Cadeia da Polimerase , Temperatura , Fatores de Tempo , Vacinas Virais , Água
12.
Vet Microbiol ; 110(1-2): 27-33, 2005 Sep 30.
Artigo em Inglês | MEDLINE | ID: mdl-16125879

RESUMO

Koi herpesvirus (KHV), which is believed to be an emerging virus, causes fatal diseases in carps. Since the 1990s, the presence of KHV has been confirmed in several countries. In Japan, from 2003 to 2004, large outbreaks of KHV infection in farmed carps resulted in the death of numerous fishes. From April to May 2004, we collected 43 dead or dying carps exhibiting typical symptoms of KHV infection in Gunma prefecture. To conduct a molecular epidemiologic study of KHV in our prefecture, we amplified DNA polymerase and the major envelope protein genes of KHV derived from carp gills using newly designed primers. We also performed sequence analysis of both genes of KHV. Sensitivity of our PCR method for amplification of DNA polymerase and the major envelope protein genes of KHV was 3 x 10(2) (100 fg) and 3 x 10(3) (1000 fg) copies of KHV genome, respectively. We detected both DNA polymerase and major envelope protein genes in 37 of 43 carps (86%). No mutation was found in both the genes sequenced from 11 strains, which included two foreign strains and one domestic strain. The results suggested that KHV strains derived from carps in our prefecture were closely related genetically to the other KHV strains.


Assuntos
Carpas/virologia , DNA Polimerase Dirigida por DNA/genética , Doenças dos Peixes/virologia , Infecções por Herpesviridae/veterinária , Herpesviridae/isolamento & purificação , Proteínas do Envelope Viral/genética , Animais , Sequência de Bases , DNA Viral/análise , Surtos de Doenças/veterinária , Doenças dos Peixes/diagnóstico , Doenças dos Peixes/epidemiologia , Amplificação de Genes , Brânquias/virologia , Herpesviridae/química , Herpesviridae/genética , Infecções por Herpesviridae/diagnóstico , Infecções por Herpesviridae/epidemiologia , Infecções por Herpesviridae/virologia , Japão/epidemiologia , Dados de Sequência Molecular , Reação em Cadeia da Polimerase/métodos , Reação em Cadeia da Polimerase/veterinária , Sensibilidade e Especificidade
13.
Int J Mol Med ; 15(3): 519-25, 2005 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-15702248

RESUMO

From an EST fragment of the rainbow trout that was predicted to contain leucine-rich repeats (LRR), we cloned the whole cDNA and identified a soluble form of TLR5 ortholog (rtTLR5S), which does not exist in the mouse and human. rtTLR5S was about 38% homologous to the extracellular domains of human (hu) and mouse (mo)TLR5, while rtTLR5S showed <25% homologous to those of other human or mouse TLRs. A chimera constructed of rtTLR5S and the intra-cellular TIR of huTLR5 expressed on HeLa cells signaled the presence of flagellin A and C from V. anguillarum, resulting in NF-kappaB activation. The mRNA of rtTLR5S was predominantly detected in the liver. The hepatoma cell line of the rainbow trout RTH149 that responded to flagellin, allowed to up-regulate rtTLR5S in response to V. anguillarum or its purified flagellin within 8 h. rtTLR5S, when co-expressed with membrane huTLR5 in HeLa cells, augmented huTLR5-mediated NF-kappaB activation in response to flagellin. These results, together with the genome information of the pufferfish Fugu (Fugu rubripes), suggest that in fish the soluble TLR5 is an acute-phase protein sensing bacterial infection via recognition of a variety of bacterial flagellins to augment NF-kappaB activation, and may be important for fish to survive from bacterial infection in the water.


Assuntos
Proteínas de Fase Aguda/metabolismo , Flagelina/metabolismo , Glicoproteínas de Membrana/metabolismo , Oncorhynchus mykiss/metabolismo , Receptores de Superfície Celular/metabolismo , Proteínas de Fase Aguda/química , Proteínas de Fase Aguda/genética , Sequência de Aminoácidos , Animais , Sequência de Bases , Linhagem Celular , Clonagem Molecular , DNA Complementar/genética , Flagelina/isolamento & purificação , Biblioteca Gênica , Humanos , Glicoproteínas de Membrana/química , Glicoproteínas de Membrana/genética , Dados de Sequência Molecular , Oncorhynchus mykiss/genética , Receptores de Superfície Celular/química , Receptores de Superfície Celular/genética , Proteínas Recombinantes de Fusão/genética , Proteínas Recombinantes de Fusão/metabolismo , Solubilidade , Receptor 5 Toll-Like , Receptores Toll-Like , Vibrio/fisiologia
14.
Fish Shellfish Immunol ; 13(3): 243-50, 2002 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-12365734

RESUMO

The possible role of fish mast cells in regulating neutrophil adhesion to vascular endothelial cells was studied using primary cultures of tilapia vascular endothelial cells. The endothelial cell monolayer, which was cultured in 96 well plates, was stimulated for appropriate periods with tilapia mast cell (tMC)-lysates or with Leibovitz-15 (L-15) medium, as a control, and peripheral neutrophils were added into each well after removal of the lysates. After 30 min incubation, cells in the wells were fixed with formalin and non-adherent neutrophils were removed. The cells were stained with Giemsa and neutrophil adhesion was observed microscopically. Although some neutrophils attached to the endothelial cells without stimulation, neutrophil adhesion was enhanced after the incubation of the endothelial cells with tMC-lysates. Neutrophil adhesion was maximal 6 h after the lysate stimulation, with a six-fold increase compared to the control. Neutrophil adhesion also increased when the endothelial cells were stimulated with neutrophil lysates, lipopolysaccharide and zymosan-treated tilapia sera. These results indicate that fish vascular endothelial cells express some neutrophil adhesion molecule(s) after stimulation with various substances.


Assuntos
Endotélio Vascular/fisiologia , Mastócitos/metabolismo , Neutrófilos/fisiologia , Tilápia , Animais , Adesão Celular , Células Cultivadas , Endotélio Vascular/citologia , Neutrófilos/ultraestrutura
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