DSpace Communidade: Embrapa Meio Ambiente (CNPMA)

Efeito da temperatura na resposta de plântulas de soja transgênica a aplicações de glifosato.

2026-08-10T14:41:07Z

Título: Efeito da temperatura na resposta de plântulas de soja transgênica a aplicações de glifosato. Autoria: MATALLO, M. B.; FRANCO, D. A. S.; MOURA, M. A. M.; ALMEIDA, S. B. D.; BLANCO, F. M. G.; CERDEIRA, A. L.; MORAES, R.; DUKE, S. O.; GAZZIERO, D. L. P. Conteúdo: Resumo: O trabalho teve como objetivo verificar, através da acumulação do ácido chiquímico, a influência da temperatura (15, 25 ou 35 oC) na resposta de plântulas de soja cv M7908 RR e M8045 RR a aplicações de 1200 e 2400 g s.a.ha-1 de glifosato. Imediatamente antes da aplicação do herbicida e aos 1, 3 e 7 dias após a pulverização, as folhas foram colhidas, secas, maceradas e extraídas com água acidificada (pH 2,0) em forno microondas e filtradas (45 μ). O filtrado foi injetado em cromatógrafo líquido de alta eficiência (CLAE) com detector de diodos em cadeia. O ensaio foi instalado no delineamento inteiramente casualizado com três repetições. Vestígios de ácido chiquímico foram detectados nas plântulas mantidas a 15 e 25 oC. A 35 oC houve uma variação de 341% e 358,7% nos teores de ácido chiquímico detectados respectivamente nas plantas das cvs Monsoy 7904 e Monsoy 8045RR em relação ao teor endógeno das plantas testemunha. Conclui-se que a temperaturas elevadas, pode ocorrer maior translocação do glifosato para áreas meristemáticas mais novas, resultando numa menor expressão do gene promotor da enzima EPSPS com a consequente acumulação do ácido chiquímico.

Data gaps in water-related ecosystem services for urban flood risk adaptation in Brazil: a national diagnostic and policy-oriented analysis.

2026-07-26T13:54:14Z

Título: Data gaps in water-related ecosystem services for urban flood risk adaptation in Brazil: a national diagnostic and policy-oriented analysis. Autoria: GJORUP, A. F.; PRADO, R. B.; MONTEIRO, J. M. G.; HELFER, F. Conteúdo: Urban floods are among Brazil’s most pressing climate-related risks, revealing limitations in conventional drainage systems and fragmented governance structures. This study provides a national diagnostic of how Water-related Ecosystem Services (WES) are addressed in the context of urban flood-risk adaptation in Brazil, based on the integration of three analytical components: a systematic literature review (2017–2025), a diagnostic assessment of national environmental datasets, and a comparative synthesis of city-level initiatives. The review of 94 peer-reviewed studies indicates that Brazilian research remains predominantly focused on watershed-scale management, while international literature increasingly advances operational approaches based on Nature-based Solutions (NbS) and Blue–Green Infrastructure (BGI). The analysis of environmental datasets reveals recent progress in data availability and spatial coverage, alongside persistent gaps related to interoperability and update frequency. A comparative synthesis of experiences from Curitiba, Recife, and São Paulo highlights that, although NbS initiatives are present and associated with flood-risk reduction efforts, their implementation remains largely pilot-based and weakly institutionalised. Overall, the diagnostic identifies three strategic pathways—data interoperability, institutional coordination, and equity-oriented monitoring—as key elements to strengthen the integration of WES into urban flood-risk adaptation and water resource management in Brazil.

Moxidectin residue in the serum of grazing meat lambs on three programs of endoparasites.

2026-07-19T14:52:29Z

Título: Moxidectin residue in the serum of grazing meat lambs on three programs of endoparasites. Autoria: FERNANDES, M. A. M.; BAPTISTA, R. de C.; GILAVERTE, S.; PERES, M. T. P.; ZAMONER, L. S. F.; ASSALIN, M. R.; MONTEIRO, A. L. G.; REYES, F. G. R. Conteúdo: Abstract: The moxidectin residue in the serum of meat lambs produced on pastures and subjected to different programs of parasitic control was investigated. The experiment was performed at the Laboratory of Production and Research for Sheep and Goats (LAPOC), Federal University of Paraná (UFPR), Brazil, between January and May 2012. The lambs were kept with their dams on pasture of Tifton-85 (Cynodon spp.) until slaughter weight (30kg) and subjected to three programs of endoparasites control: (T1) regular deworming, every 28 days; (T2) deworming after the count of the number of eggs per gram of feces (EPG) if greater than 700 and (T3) selective deworming by the FAMACHA® method. The design was a randomized complete block with three treatments (control programs) and three replicates, with 14 lambs per program and 42 animals in total. Suffolk females and no castrated male lambs were homogeneously distributed on the blocks according to sex and type of birth (single and twin). Lambs presented initial weight and age of 19 kg and 42 days, respectively. Lambs were monitored for parasitic infection at intervals of 14 days after the starting of the evaluations (T2 e T3). The animals subjected to FAMACHA® guide (T3) that presented scores of 3, 4 or 5 were dewormed with anthelmintic drugs. At the regular control program (T1), all lambs were treated with the same drugs at the starting (day zero) and every 28 days, until slaughter. Regardless of the program for endoparasites control, the association of moxidectin (Cydectin®; 1 mL/50 kg body weight) with nitroxynil (Dovenix®; 1 mL/16.6 kg body weight) was used, because of proved efficacy for the flock. The recommended withdrawal period (28 days before slaughter) was respected for drugs dosing. The analysis to identify and quantify moxidectin residue levels in serum of lambs was performed at the Laboratory of Food Toxicology, University of Campinas (UNICAMP), Brazil. The validated analytical method presented between 80 to 107.3 % of accuracy and 1.7 to 6.7% of precision. This method was based on acetonitrile extraction, extract cleanup by dispersive solid phase using primary and secondary amine (PSA) plus octadecyl (C18), and analysis by liquid chromatography coupled with mass spectrometry (LC-ESI-MS/MS). The limits of detection and quantification were 2.0 ng.mL-1 and 5.0 ng.mL-1, respectively. The mean number of anthelmintic dosing per animal was 3.0 (T1), 2.9 (T2) and 2.7 (T3), ranging between 0 (none) and six per lamb. However, no moxidectin residue was detected on serum of lambs. Thus, the selective programs of endoparasite control (FAMACHA and EPG) or the anthelmintic application at regular intervals promoted no detectable moxidectin residue on serum of lambs, if respected the minimum withdrawal period of 28 days.

Boosting growth, health, and productivity of Nile tilapia by supplementing Artemisia annua under tropical net cage farming conditions.

2026-07-12T16:46:28Z

Título: Boosting growth, health, and productivity of Nile tilapia by supplementing Artemisia annua under tropical net cage farming conditions. Autoria: SOARES, M. P.; MARASCHI, A. C.; ANGELIS, C. F. de; QUEIROZ, S. C. do N. de; JONSSON, C. M.; CAMPOS, C. M. de; FERNANDES, M. N.; LEITE, C. A. C.; RANTIN, F. T.; SAMPAIO, F. G. Conteúdo: Abstract: The rapid global expansion of aquaculture demands innovative strategies to enhance productivity while safeguarding fish health under intensive rearing conditions. This study investigated the effects of dietary supplementation with an alcoholic extract of Artemisia annua (ae-Aa) on growth performance, physiological stress, immune responses, oxidative status, and tissue morphology of Nile tilapia (Oreochromis niloticus) cultured in a high-density net-cage system. A 2 × 2 factorial was applied, including two dietary treatments (supplemented, S; non-supplemented, NS) and two feeding periods (30 and 60 days), yielding four experimental groups (S-30, NS-30, S-60, NS-60). Compared with their respective controls, ae-Aa supplementation significantly enhanced survival and growth at both time points (P < 0.05), evidenced by greater weight gain and protein efficiency ratio and a reduced feed conversion ratio. Supplemented fish also showed increased intestinal villus thickness and hepatosomatic index (P < 0.05). Plasma cortisol concentrations were significantly lower in supplemented groups at both sampling periods (P < 0.05). Moreover, ae-Aa supplementation stimulated innate immune responses, reflected by elevated lysozyme activity, plasma protein level, and leukocyte respiratory burst (P < 0.05). Oxidative stress was notably mitigated in supplemented fish (P < 0.05), with reduced lipid peroxidation, enhanced catalase, glutathione peroxidase, and glutathione S-transferase activities, and decreased DNA damage observed at 60 days. In conclusion, dietary ae-Aa supplementation improved growth performance, immune competence, antioxidant capacity, and tissue integrity while alleviating physiological stress in Nile tilapia, supporting its application as a sustainable plant-based feed additive for intensive aquaculture systems.