Structural Analysis of Tillandsia usneoides L. Exposed to Air Pollutants in São Paulo City–Brazil     

Edenise Segala Alves  Bárbara Baêsso Moura  Marisa Domingos 《Water, air, and soil pollution》2008,189(1-4):61-68

Bioindicators plants are important for the evaluation of air quality and Tillandsia usneoides L., an atmospheric epiphyte bromeliad, has been used for this purpose. The present study aims at evaluate the structural pattern of the leaf of this species when exposed to urban air pollutants, and determining whether the leaves present structural parameters that could be used as indicators of such pollutants. Samples of T. usneoides were exposed in São Paulo, the biggest city of Brazil, for 8, 16 and 24 weeks, and compared with others kept in a rural area. The urban pollution of São Paulo affected the structure of the leaves of T. usneoides causing alterations, especially in the scales, density of stomata and epidermis thickness. Qualitative alterations in the mesophyll were not observed in plants exposed at the polluted sites. These structural characteristics of T. usneoides seem to account for its high tolerance to heavy metal accumulation. The percentage of anomalous scales may potentially be used as an alternative bioindicator parameter.  相似文献   

Geographical distribution of Vip3Aa20 resistance allele frequencies in Spodoptera frugiperda (Lepidoptera: Noctuidae) populations in Brazil     

Fernando S A Amaral  Aline S Guidolin  Eloisa Salmeron  Rubens H Kanno  Fernando E O Padovez  Júlio C Fatoretto  Celso Omoto 《Pest management science》2020,76(1):169-178

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Ovicidal lectins from Moringa oleifera and Myracrodruon urundeuva cause alterations in chorionic surface and penetrate the embryos of Aedes aegypti eggs     

Robson RV Alves  Tatiana Soares  Elinaldo FL Bento  Ricardo S Roldan‐Filho  Brbara SS Souza  Marcele KN Lima  Jssica S Nascimento  Luana CBB Coelho  Roberto A S  Thmarah A Lima  Gabriel GA Gonalves  Fbio A Brayner  Luiz C Alves  Daniela MAF Navarro  Thiago H Napoleo  Patrícia MG Paiva 《Pest management science》2020,76(2):730-736

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Prevalence and risk factors for anti-Toxoplasma gondii antibodies in goats of the Seridó Oriental microregion, Rio Grande do Norte state, Northeast region of Brazil     

Neto JO  Azevedo SS  Gennari SM  Funada MR  Pena HF  Araújo AR  Batista CS  Silva ML  Gomes AA  Piatti RM  Alves CJ 《Veterinary parasitology》2008,156(3-4):329-332

The prevalence and risk factors for anti-Toxoplasma gondii antibodies were investigated in goats of the Seridó Oriental microregion, Rio Grande do Norte state, Northeast region of Brazil. Three hundred and sixty-six blood samples from goats collected by jugular venopuncture were used. For the serologic diagnosis of Toxoplasma gondii infection, the indirect fluorescent-antibody test (IFAT) with cut-off value 1:64 was carried out. The prevalence of anti-T. gondii antibodies was 30.6% [95% CI=25.9-35.6%] with titers ranging from 1:64 to 1:16,384. The multivariate logistic regression analysis showed that the risk factors associated to anti-T. gondii antibodies were presence of cats in the herd, extensive/semi-intensive management systems and lack of mineral supplementation.  相似文献   

E-cadherin expression in canine cutaneous histiocytoma     

Pires I  Alves A  Rodrigues P  Queiroga FL  Lopes CS 《The Veterinary record》2008,163(2):59-60; author reply 60

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Clinicopathologic features of mammary invasive micropapillary carcinoma (IMC) in dogs     

Gama A  Alves A  Schmitt FC 《Veterinary pathology》2008,45(4):600-601

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Diagnosis of canine visceral leishmaniasis: biotechnological advances     

Gomes YM  Paiva Cavalcanti M  Lira RA  Abath FG  Alves LC 《Veterinary journal (London, England : 1997)》2008,175(1):45-52

Human visceral leishmaniasis (HVL) is endemic in the tropical and sub-tropical regions of Africa, Asia, the Mediterranean, Southern Europe and South and Central America, with approximately 500,000 new cases reported annually. As dogs are considered to be the major reservoirs for HVL, the accurate diagnosis of disease in these animals is important. Diagnosis of canine visceral leishmaniasis (CVL) is performed mainly by direct parasitological methods that can yield false-negative results, either because of the very low number of Leishmania spp. organisms in clinical samples (bone marrow and lymph nodes) or because morphological identification is difficult. In addition, these methods are invasive. Conventional serological techniques are limited by cross-reactivity with other parasitic diseases and because several technical procedures have not been standardised. The development of polymerase chain reaction based approaches and immunoassays based on the use of recombinant antigens aimed at improving the sensitivity and specificity of CVL diagnosis is discussed.  相似文献   

Strategies of the control of an outbreak of leptospiral infection in dairy cattle in Northeastern Brazil     

Pimenta  Carla Lauise Rodrigues Menezes  da Costa  Diego Figueiredo  Silva  Maria Luana Cristiny Rodrigues  Pereira  Hélio Domingos  Júnior  João Pessoa Araújo  Malossi  Camila Dantas  Ullmann  Leila Sabrina  Alves  Clebert José  de Azevedo  Sérgio Santos 《Tropical animal health and production》2019,51(1):237-241

The aim of the present study was to describe the strategies of the control of an outbreak of leptospiral infection in dairy cattle in Maranhão State, Northeastern Brazil. In the period from January to July 2015, 18 (17%) out of 106 cows presented abortion, six (5.7%) stillbirth, and 12 (11.3%) repeated estrus, totaling 24 animals with reproductive problems. The diagnosis of leptospirosis was based on serology (microscopic agglutination test—MAT), bacteriological culture, and polymerase chain reaction (PCR). Antibiotic therapy, vaccination protocols, and changes in management practices were suggested as control measures. Of all animals on the farm (n?=?280), 136 (48.6%) were seropositive for at least one serovar of Leptospira sp. No pure leptospiral culture was obtained. Eight of the animals with reproductive problems yielded positive PCR results (vaginal fluid of seven animals and urine and vaginal fluid of one animal). Genetic sequencing of a vaginal fluid/urine PCR-positive sample revealed Leptospira borgpetersenii. One year after the adoption of control measures, no reproductive problems were observed. Thus, leptospirosis probably caused the reproductive failures in the herd, and the control and prevention measures implemented were efficient in controlling the disease.

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Effects of Rotifer and Artemia Fatty-Acid Enrichment on Survival, Growth and Pigmentation of Summer Flounder Paralichthys dentatus Larvae   总被引：2，自引：0，他引：2  

Edward P.  Baker  David  Alves David A.  Bengtson 《Journal of the World Aquaculture Society》1998,29(4):494-498

Abstract— Enrichment of live food for marine fish larvae with highly unsaturated fatty acids (HUFA) has been shown to improve survival, growth and stress resistance in many species and to decrease pigmentation abnormalities in flatfish. In order to aid the developing summer flounder industry, we conducted an experiment in which summer flounder larvae were fed diets differing in HUFA composition to determine whether enrichment with a commercially available product would increase survival and growth and reduce the incidence of abnormal pigmentation. We also examined whether growing unenriched rotifers on different species of algae would affect the survival, growth and pigmentation of the flounder larvae to which they were fed. Growth of summer flounder larvae was significantly better when they were fed HUFA-enriched Mtifers and Artemia rather than unenriched and, among the unenriched treatments, was significantly better when the larvae were fed rotifers raised on Isochrysis galbana rather than on Tetraselmis suecica . The percentage of larvae that failed to complete metamorphosis during the experiment was significantly higher in the unenriched treatments than in the enriched treatments. Neither survival nor percentage of individuals with pigmentation abnormalities were significantly different among the treatments.  相似文献   

Soybean molasses as an organic carbon source in the farming of Litopenaeus vannamei (Boone, 1931) in a biofloc system          下载免费PDF全文

Carlos Manoel do Espírito Santo  Isabela Claudiana Pinheiro  Gabriel Fernandes Alves de Jesus  José Luiz Pedreira Mouriño  Felipe do Nascimento Vieira  Walter Quadros Seiffert 《Aquaculture Research》2017,48(4):1827-1835

Soybean molasses was evaluated as a partial replacement for sugarcane molasses as a carbon source for biofloc development in the superintensive culture of Pacific white shrimp (Litopenaeus vannamei). A 50‐day study was conducted with juvenile (3.2 g) shrimp stocked in 16 800 L tanks at a stocking density of 250 shrimp m^?3. Control of total ammonia concentration was performed by the addition of combined mixtures of soybean and sugarcane molasses to the culture water. Three different molasses treatments were evaluated using different soybean‐to‐sugarcane molasses ratios: 15–85%, 38–62% and 60–40% respectively. The control group was treated only with sugarcane molasses. Water quality, chlorophyll a concentration, heterotrophic bacterial load, Vibrio spp. concentration and zootechnical indexes were all evaluated. Total ammonia concentration was controlled by heterotrophic and chemotrophic pathways. Biofloc formation, as quantified by measuring the total suspended solids, was not altered. The Vibrio spp. concentration showed a significant reduction in treatments with soybean‐to‐sugarcane molasses ratios of 38–62% and 60–40%. All combined mixtures of soybean and sugarcane molasses could maintain water quality and productivity in the superintensive culture of L. vannamei using the biofloc system. Thus, the potential use of a residue from agroindustry as a carbon source in a biofloc culture is demonstrated.  相似文献