Anais da Academia Brasileira de Ciencias最新文献

Calcium and pH preferences and establishment responses of a common biocrust moss from Brazilian rocky outcrops. 巴西露头岩石中一种常见生物苔藓对钙和pH值的偏好和建立反应。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620241337

Mateus F Oliveira, Guilherme F Oliveira, Pablo O Santos, Cíntia Aparecida T Araújo, Lucas A Souza, Adaíses Simone Maciel-Silva

{"title":"Calcium and pH preferences and establishment responses of a common biocrust moss from Brazilian rocky outcrops.","authors":"Mateus F Oliveira, Guilherme F Oliveira, Pablo O Santos, Cíntia Aparecida T Araújo, Lucas A Souza, Adaíses Simone Maciel-Silva","doi":"10.1590/0001-3765202620241337","DOIUrl":"https://doi.org/10.1590/0001-3765202620241337","url":null,"abstract":"Brazilian rocky outcrops are home to prominent biological soil crusts (biocrusts), with mosses standing out due to their specific adaptations, such as desiccation tolerance and the ability to regulate toxic element concentrations. These outcrops-quartzite, ironstone (Cangas), and limestone-represent a gradient of calcium and pH levels in the soil: quartzite < ironstone < limestone. This study explores the calcium and pH preferences of Bryum atenense R.S. Williams (Bryaceae), a common moss in biocrusts from Brazilian outcrops, to assess potential ecotypic variation in response to these edaphic conditions. Our findings show that higher calcium concentrations (≥156.35 mmol/L) and elevated pH levels (≥ 7.0) can reduce or inhibit establishment and asexual reproduction in B. atenense plants collected from the ironstone outcrop. We further hypothesize that B. atenense populations from distinct outcrop types may exhibit varying levels of calcium adaptability. These insights contribute to understanding how calcium influences bryophyte ecology and their adaptability to different rocky outcrop ecosystems in Brazil.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20241337"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of COVID-19-induced social isolation on mammal roadkills on the BR-101 highway in Rio de Janeiro State, Brazil. 新冠肺炎引发的社会隔离对巴西巴西里约热内卢州BR-101高速公路上哺乳动物死亡的影响

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620240983

Thiago A Domingos, Pablo R Gonçalves, Marcello Guerreiro, Helio Secco

{"title":"Effect of COVID-19-induced social isolation on mammal roadkills on the BR-101 highway in Rio de Janeiro State, Brazil.","authors":"Thiago A Domingos, Pablo R Gonçalves, Marcello Guerreiro, Helio Secco","doi":"10.1590/0001-3765202620240983","DOIUrl":"https://doi.org/10.1590/0001-3765202620240983","url":null,"abstract":"The COVID-19 pandemic's enforced social isolation significantly disrupted numerous economic activities, notably road transport. This period, dubbed \"anthropause,\" provided a unique moment to study its effects on wildlife, specifically mammal roadkill patterns on Brazil's BR-101/North-RJ highway. This research assessed whether reduced vehicle traffic during the pandemic's first year impacted mammal roadkill rates. Monitoring was conducted monthly from March 2019 to February 2021, spanning pre-pandemic and pandemic periods, across four 10-km highway sections. Findings indicated a 45% decrease in mammal roadkills during the pandemic, especially in the third quadrimester (November-2020 to February-2021) of the pandemic period (W = 77; p = 0.027). Of the nine taxa examined, Didelphis aurita and Coendou spinosus experienced the most significant reductions in roadkill rate. No link was found between climatic conditions and roadkill frequency, yet a noteworthy correlation emerged between vehicle traffic volume and roadkill rates (r = 0.281; p = 0.005). Despite a temporary decline in traffic, varying roadkill rates across highway segments pointed to diverse responses from environmental and traffic variations. The study emphasizes that even modest reductions in traffic can significantly lower roadkill rates, supporting the idea that the anthropause positively influenced the reduction of road-induced mortality among Neotropical mammals.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20240983"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reducing Water Adsorption in Bacterial Nanocellulose through via sol-gel method. 溶胶-凝胶法降低细菌纳米纤维素对水的吸附。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620241388

María Alejandra Murillo, Stefany Valentina Ruano, Alis Pataquiva-Mateus

{"title":"Reducing Water Adsorption in Bacterial Nanocellulose through via sol-gel method.","authors":"María Alejandra Murillo, Stefany Valentina Ruano, Alis Pataquiva-Mateus","doi":"10.1590/0001-3765202620241388","DOIUrl":"https://doi.org/10.1590/0001-3765202620241388","url":null,"abstract":"Bacterial nanocellulose (BNC), produced by Gluconacetobacter xylinus and G. hansenii, is a promising biopolymer. In this study, green tea and sucrose were used as a sustainable and low-cost culture medium, achieving optimal conditions at 60 g/L sucrose supplemented with green tea, with a maximum yield of 7.56 g of dry BNC after 15 days of cultivation. To address the limitation posed by BNC's high water-holding capacity in textile applications, BNC was functionalized with titanium dioxide (TiO₂) nanoparticles via a sol-gel method, applied for the first time for this specific purpose. Optimal conditions (24 h immersion, 30 °C drying temperature, and 5.5 h drying time) reduced the water-holding capacity to 2.77 g of water per gram of dry BNC, representing a reduction of more than 98% compared to uncoated BNC. Mechanical properties improved significantly after TiO₂ incorporation, reaching a Young's of 0.50 ± 0.30 MPa and tensile stress of 5.57 ± 1.50 MPa. FTIR, SEM, AFM, and EDS analyses confirmed the formation of a continuous TiO₂ coating that acts as an effective barrier to water ingress. These results highlight BNC-TiO₂ composites as economical, ecological, and robust alternatives for advanced textile applications.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20241388"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147759992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Protective effect of latex proteins from Plumeria pudica against acetaminophen-induced acute liver injury. 鸡蛋花乳胶蛋白对对乙酰氨基酚所致急性肝损伤的保护作用

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620240815

Bruna DA Silva Souza, Ana Clara S Sales, Francisca Dayane S DA Silva, Gabriella L DE Andrade, Thalis F DE Souza, Ana Patrícia DE Oliveira, André Luis F Lopes, Gabriella Pacheco, Even Herlany P Alves, Paulo Roberto C Gomes, Paulo Sérgio A Sousa, Simone DE Araújo, Erick Bryan S Lima, Celso M Queiroz-Junior, Mauro M Teixeira, Vivian V Costa, Jefferson A Rocha, Jand V R Medeiros, Cleverson D T DE Freitas, Daniel Fernando P Vasconcelos, Jefferson S DE Oliveira

{"title":"Protective effect of latex proteins from Plumeria pudica against acetaminophen-induced acute liver injury.","authors":"Bruna DA Silva Souza, Ana Clara S Sales, Francisca Dayane S DA Silva, Gabriella L DE Andrade, Thalis F DE Souza, Ana Patrícia DE Oliveira, André Luis F Lopes, Gabriella Pacheco, Even Herlany P Alves, Paulo Roberto C Gomes, Paulo Sérgio A Sousa, Simone DE Araújo, Erick Bryan S Lima, Celso M Queiroz-Junior, Mauro M Teixeira, Vivian V Costa, Jefferson A Rocha, Jand V R Medeiros, Cleverson D T DE Freitas, Daniel Fernando P Vasconcelos, Jefferson S DE Oliveira","doi":"10.1590/0001-3765202620240815","DOIUrl":"https://doi.org/10.1590/0001-3765202620240815","url":null,"abstract":"The protein fraction from Plumeria pudica latex (LPPp) was evaluated against APAP-induced liver injury in mice. Key measurements included total leukocyte count, liver weight, AST, ALT, liver levels of MDA, GSH, SOD, MPO, NO3/NO2 concentration, cytokines TNF-α, IL-β, IL-6, IL-10, IFN- γ, and CXCL1. Histopathological and immunohistochemical analysis were conducted, and proteins in LPPp were identified by mass spectrometry. Molecular docking analyses were performed with LPPp proteins and APAP, NAPQI, TNF-α, and IFN-α. LPPp reduced liver weight, ALT, and AST levels, and prevented the decrease in total leukocyte count, indicating protection against liver injury. It also reduced MDA levels and preserved GSH and SOD levels, showing its antioxidant properties. LPPp significantly inhibited MPO and NO3/NO2 levels, reducing inflammation. LPPp decreased levels of TNF-α, IL-β, IL-6, IFN-γ, and CXCL1, while IL-10 levels remained elevated, suggesting an anti-inflammatory response. Histological analysis showed preserved liver tissue, and anti-Ly6C immunostaining indicated reduced neutrophil accumulation. Molecular docking revealed that latex cysteine proteases had a higher affinity for APAP and NAPQI, while a proteinase inhibitor showed affinity for CYP2EI, TNF-α, and IFN-α. These findings suggest that LPPp protects against APAP hepatotoxicity by interfering with APAP and NAPQI metabolism, reducing oxidative stress and inflammation, thus preventing hepatocyte damage.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20240815"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147759965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In silico development microsatellite marker panel and characterization for the endangered neotropical species Brycon orbignyanus (Characiformes, Bryconidae): a short communication. 濒危新热带物种Brycon orbignyanus（特指，Bryconidae）的微卫星标记板及其特征：短通讯。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620251018

Daralyns B Macedo, Carlos Willian D Dantas, Sandy Ingrid A Alves, Dárcia Gabriela B DA Costa, Ádria Diva Dos Santos, Regianne Maciel S Correa, Hendrya Julianny P Coelho, Carla Giovanni Á Moreira, Heden Luiz M Moreira, Rommel Thiago J Ramos, Marília Danyelle N Rodrigues

{"title":"In silico development microsatellite marker panel and characterization for the endangered neotropical species Brycon orbignyanus (Characiformes, Bryconidae): a short communication.","authors":"Daralyns B Macedo, Carlos Willian D Dantas, Sandy Ingrid A Alves, Dárcia Gabriela B DA Costa, Ádria Diva Dos Santos, Regianne Maciel S Correa, Hendrya Julianny P Coelho, Carla Giovanni Á Moreira, Heden Luiz M Moreira, Rommel Thiago J Ramos, Marília Danyelle N Rodrigues","doi":"10.1590/0001-3765202620251018","DOIUrl":"https://doi.org/10.1590/0001-3765202620251018","url":null,"abstract":"This short communication presents novel molecular tools designed for the endangered species Brycon orbignyanus. In conservation studies, the development of population-specific markers tailored to particular geographic regions is essential. In this study, the prevalence of imperfect microsatellites highlights a evolution of this type of microsatellite in a population of Pelotas, Rio Grande do Sul. Therefore, the methodology used can serve as a guideline for genetic variability analysis even before conducting in vitro or in situ tests. These findings contribute significantly to technological prospecting and hold promise for applications in conservation programs. Additionally, they provide a basis for in vitro assays, such as PCR, to support species monitoring efforts.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20251018"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147759998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The long-term global sea surface temperature anomalies: the role of tropics and midlatitudes. 长期全球海表温度异常：热带和中纬度地区的作用。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620240209

Mary T Kayano, Rita V Andreoli, Wilmar L Cerón, Marília H Shimizu, Rodrigo A F Souza, Leonardo C M Jimenez, Itamara P Souza, Wallace Cevalho

{"title":"The long-term global sea surface temperature anomalies: the role of tropics and midlatitudes.","authors":"Mary T Kayano, Rita V Andreoli, Wilmar L Cerón, Marília H Shimizu, Rodrigo A F Souza, Leonardo C M Jimenez, Itamara P Souza, Wallace Cevalho","doi":"10.1590/0001-3765202620240209","DOIUrl":"https://doi.org/10.1590/0001-3765202620240209","url":null,"abstract":"The global mean sea surface temperature (SST) anomaly time series in the 60°N-60°S band (GT) has been used to infer the secular climate change. Contributions of the tropical (TT) and extratropical (northern - NT; and southern - ST) sectors to the GT time series are examined. Monthly averaged SST anomaly time series in these selected global zonal bands and in the combined NT and ST band (NST) are constructed. For all bands, the corresponding yearly series for the 1901-2020, 1901-1970, and 1971-2020 periods show significant positive trends, with the largest values during the 1971-2020, except for ST, confirming the global warming acceleration in recent decades. The analysis here suggests that the contributions of the tropical and midlatitudes SST to the GT positive trend depend on the analyzed period and might have influences of the low-frequency variability modes. Concerning the variabilities in the GT time series, at the 0.5-2-year, interannual and interdecadal time scales are, respectively, mostly due to the NST SST anomalies, the TT SST anomalies, and the TT and NST SST anomalies. We believe that our findings might help guide future studies on SST trends and variability.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20240209"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Addition of Lippia sidoides Essential Oil to Tilapia Diet: Performance Analysis, Blood Parameters, and Challenges of Air Exposure and Experimental Infection. 罗非鱼饲料中添加利皮苷精油：性能分析、血液参数、空气暴露和实验感染的挑战。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250553

Jaqueline Inês A DE Andrade, Giulia Beatrice Ferreira, Poliana Kopitski, Eduardo DA Silva, Maurício L Martins, Francisco Célio M Chaves, Ricardo Evandro Mendes, Adolfo Jatobá

{"title":"Addition of Lippia sidoides Essential Oil to Tilapia Diet: Performance Analysis, Blood Parameters, and Challenges of Air Exposure and Experimental Infection.","authors":"Jaqueline Inês A DE Andrade, Giulia Beatrice Ferreira, Poliana Kopitski, Eduardo DA Silva, Maurício L Martins, Francisco Célio M Chaves, Ricardo Evandro Mendes, Adolfo Jatobá","doi":"10.1590/0001-3765202620250553","DOIUrl":"https://doi.org/10.1590/0001-3765202620250553","url":null,"abstract":"This study evaluated the effects of Lippia sidoides essential oil (LSEO) as a growth and health promoter for juvenile tilapia subjected to stress induced by air exposure and experimental infection with Aeromonas hydrophila. Juvenile were allocated to 15 tanks (in triplicate) and fed diets containing 0.0% (Control), 0.05%, 0.1%, 0.2%, or 0.4% LSEO for 33 days. For the air exposure challenge, five fish from each tank were exposed to air for five minutes after the feeding period. Blood samples were collected for hematological analysis. For the infection challenge, six fish from each tank were intraperitoneally inoculated with 100 µL of A. hydrophila and monitored for ten days. Hematological and histomorphometric parameters were assessed. The results indicated that the 0.4% LSEO supplementation reduced feed conversion ratios (P < 0.05). Before the challenges, LSEO concentrations influenced total counts of neutrophils, basophils, and monocytes (P < 0.05). After the air exposure and infection challenges, no significant differences were observed among treatments for these parameters (P > 0.05). Regarding hematimetric indices, all parameters were affected by LSEO concentrations prior to the challenges (P < 0.05). Although LSEO supplementation improved feed conversion, it did not mitigate the hematological alterations caused by the stress challenges.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20250553"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147759866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating and modeling pacu (Piaractus mesopotamicus) growth in intensive floating cage culture: A nonlinear approach for lotic freshwater systems. 集约化浮式网箱养殖中pacu （Piaractus mesopotamicus）生长的评估和建模：一种用于淡水系统的非线性方法。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250867

Exequiel Oscar Furlan, Adriana Pérez, Luciano Kees, Ricardo Roselló, Norberto Ojeda, Silvina Beatriz Chemes, Pablo Martín Beldomenico

{"title":"Evaluating and modeling pacu (Piaractus mesopotamicus) growth in intensive floating cage culture: A nonlinear approach for lotic freshwater systems.","authors":"Exequiel Oscar Furlan, Adriana Pérez, Luciano Kees, Ricardo Roselló, Norberto Ojeda, Silvina Beatriz Chemes, Pablo Martín Beldomenico","doi":"10.1590/0001-3765202620250867","DOIUrl":"https://doi.org/10.1590/0001-3765202620250867","url":null,"abstract":"Pacu (Piaractus mesopotamicus) is traditionally farmed in ponds, but floating cages (intensive productive systems) are gaining momentum. This study evaluated the growth performance of P. mesopotamicus reared in floating cages in lotic freshwater system conditions and identified the most suitable nonlinear growth model. Small-scale production systems were monitored over three grow-out cycles (2021-2024), comprising 13 floating cages (14 m³) installed in secondary channels of the Middle Paraná River. Approximately 3,600 juveniles (initial weight: 168.1 ± 89.3 g) were stocked at a density of ~21 fish m-³ and fed commercial diets under a two-phase feeding protocol. Fish were sampled monthly for weight, length and condition. Marketable size (~1 kg) was reached within a production window of 3 to 5 months (129 ± 13 days). The mean specific growth rate was 0.97 ± 0.39% day-1 and the feed conversion ratio was low (1.78 ± 0.73 kg kg-1). Final biomass density reached 20.2 kg m-³. Growth was best described by a Gompertz model, with an asymptotic weight near 1.2 kg. Significant improvements in condition indices were recorded. These findings support the feasibility of expanding pacu aquaculture in cage freshwater systems as a sustainable protein source and development opportunity for local economies.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20250867"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of genetic diversity and cross-compatibility among pitaya (Selenicereus spp.) genotypes. 火龙果（Selenicereus spp.）基因型遗传多样性及交叉相容性评价。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250010

Núbia C Santos, Maria DO Céu M Cruz, Deilson DE A Alves, Amanda G Guimarães, Guilherme S Pereira, Carla Cristina DA Silva, Caique M DE Abreu

{"title":"Assessment of genetic diversity and cross-compatibility among pitaya (Selenicereus spp.) genotypes.","authors":"Núbia C Santos, Maria DO Céu M Cruz, Deilson DE A Alves, Amanda G Guimarães, Guilherme S Pereira, Carla Cristina DA Silva, Caique M DE Abreu","doi":"10.1590/0001-3765202620250010","DOIUrl":"https://doi.org/10.1590/0001-3765202620250010","url":null,"abstract":"New pitaya (Selenicereus spp.) cultivars can be obtained through the selection of genotypes and the development of hybrids from intra- and interspecific crosses. This research was carried out to evaluate the compatibility of intra- and interspecific crosses between S. undatus and S. monacanthus through controlled and natural pollination, and to assess the genetic diversity of the plants using SSR molecular markers. Intraspecific and interspecific diversity was assessed using 29 SSR molecular markers. Interspecific crosses between S. undatus and S. monacanthus showed compatibility, while intraspecific crosses involving the studied genotype of S. monacanthus were not viable, and those with S. undatus resulted in low fruit set rate. Controlled interspecific crosses between S. undatus and S. monacanthus ensured a higher fruit set rate and the production of fruits with larger size and a higher number of seeds. Interspecific cross-pollination of S. undatus with S. monacanthus pollen improved the quality of its fruits. The genetic diversity of the orchard favored the production of better-quality fruits. The population of S. undatus and S. monacanthus in the studied orchard was probably formed by a single clone.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20250010"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Continuous Upper Bound Limit Analyses of Face Stability for Shallow Shield Tunneling in Undrained Clays with Variable Displacement Fields and Various Yield Criterions. 不同屈服准则下不排水粘土浅埋盾构掘进工作面稳定性连续上限分析。

IF 1.1 4区综合性期刊

Anais da Academia Brasileira de Ciencias Pub Date : 2026-04-20 eCollection Date: 2026-01-01 DOI: 10.1590/0001-3765202620250292

Providence Habumuremyi, Yanyong Xiang

{"title":"Continuous Upper Bound Limit Analyses of Face Stability for Shallow Shield Tunneling in Undrained Clays with Variable Displacement Fields and Various Yield Criterions.","authors":"Providence Habumuremyi, Yanyong Xiang","doi":"10.1590/0001-3765202620250292","DOIUrl":"https://doi.org/10.1590/0001-3765202620250292","url":null,"abstract":"This paper presents a novel method of 3D analytical continuous upper bound limit analysis for face stability of shallow shield tunneling in undrained clays by developing a general method to include empirically based analytical displacement fields with variable ground loss and inflection characteristics and both shear-mode-independent and -dependent yield criterions. The developed scheme is verified against finite element limit analysis and existing conceptual upper bound schemes in the literature. Comparative calculations reveal that the results of the stability threshold variables, i.e. the minimum required tunnel face support pressure and the corresponding maximum permissible stability number, with variable ground loss and inflection characteristics are more conservative than those in the existing literature results with fixed ground loss and inflection characteristics, and less conservative than existing conceptual upper bound schemes. Parametric calculations indicate that the results with the shear-mode-dependent TEKJ2J3 criterion are more conservative than those with the shear-mode-independent Tresca criterion and that for the TEKJ2J3 criterion, the smaller the undrained triaxial extension-to-compression shear strength ratio, the more conservative the results.","PeriodicalId":7776,"journal":{"name":"Anais da Academia Brasileira de Ciencias","volume":"98 1","pages":"e20250292"},"PeriodicalIF":1.1,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147760036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0