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  • Miniatura
    Item type: Artículo ,
    Evaluación de la productividad en cultivos locales de Manihot esculenta Crantz asociada a la aplicación con cepas de Trichoderma asperellum y T. harzianum aisladas de suelos de la provincia de Misiones
    (Universidad Nacional de La Plata. Facultad de Ciencias Agrarias y Forestales, 2024-09)
    Madrassi, Lucas Martín
    ;
    Bruera, Camila Rocío
    ;
    Vedoya, Maria Celina
    ;
    García, María Victoria
    La especie Manihot esculenta Crantz, conocida localmente como mandioca, es uno de los cultivos más consumidos a nivel mundial y, debido a su importancia, es objeto de numerosas investigaciones que buscan mejorar su productividad. Muchos de estos trabajos evalúan el uso de la aplicación con microorganismos, por ejemplo, especies del género Trichoderma, y su efecto biofertilizante. Sin embargo, se desconoce el efecto de cepas de Trichoderma sobre la productividad en plantaciones locales de mandioca en la provincia de Misiones. El objetivo del presente trabajo fue evaluar el efecto del uso de aplicaciones con cepas aisladas de suelos misioneros de T. asperellum, de T. harzianum y de una combinación de ambas especies sobre la productividad de la variedad de mandioca IAC 90, la cual es ampliamente usada por los productores misioneros. Se probaron cuatro tratamientos (T. asperellum TU2, T. harzianum TC7, la combinación T. asperellum TU2 + T. harzianum TC7 y un control negativo) a campo bajo condiciones tradicionales de cultivo y se evaluaron caracteres morfológicos radicales y aéreos de interés productivo. Los resultados indicaron que el tratamiento combinando ambas especies (T. asperellum TU2 + T. harzianum TC7) tuvo un efecto estadístico significativo en el aumento de la producción de raíces y de la altura de las plantas de la variedad de mandioca IAC 90 bajo un manejo tradicional del cultivo.
  • Miniatura
    Item type: Artículo ,
    Association of reproduction with seasonality in a subtropical viviparous fish, Jenynsia tucumana (Cyprinodontiformes: Anablepidae)
    (National Research Council Canada-NRC Research Press, 2024-02)
    Jewell, Hanna K.
    ;
    Noguera, Carlos Alberto
    ;
    Hael, Clara Ercilia
    ;
    Torres Dowdall, Julián Roberto
    ;
    Aguilera, Gaston
    For fishes in temperate environments, the timing of seasonal reproduction has been correlated with changes in photoperiod and temperature. In tropical environments, seasonal hydrological patterns have been found to be drivers of the onset of reproduction. Despite these established relationships, data on reproductive seasonality for viviparous fish are limited. Here, we investigate aspects of reproduction in the viviparous fish Jenynsia tucumana Aguilera & Mirande, 2005 over the course of 12  months in the Salí River basin (Tucumán, Argentina), which is characterized by dry, short winters, and long, tropical summers. Size and reproductive data were collected each month. We found J. tucumana displayed marked sexual dimorphism in size, with females having higher length and weight when compared to males. Larger females have higher fecundities compared to smaller females. The breeding season corresponds with seasonal changes in photoperiod, air temperature, and rainfall, but ends with the arrival of heavy rainfall later in the season. Interestingly, J. tucumana produce and mature oocytes year-round, unlike congeneric species. This may be an adaptive strategy imposed by the irregular flooding of subtropical mountainous river stream habitats, which maintain high productivity well into early autumn.
  • Miniatura
    Item type: Artículo ,
    Progress in Avalanche Photodiodes for Laser Ranging
    (Multidisciplinary Digital Publishing Institute, 2025-04)
    Liu, Zhenxing
    ;
    An, Ning
    ;
    Han, Xingwei
    ;
    Nuñez, Natalia Edith
    ;
    Jin, Liang
    Laser ranging is a high-precision geodetic technique that plays an indispensable role in the field of geodynamics. Avalanche photodiodes (APDs) offer a series of advantages over other photodetector technologies, including photomultiplier tubes (PMTs) and superconducting single-photon detectors (SNSPDs). These advantages include high sensitivity, small size, high integration, and low power consumption, which have contributed to the widespread use of APDs in laser ranging applications. This paper analyses the key role of APDs in enhancing the accuracy and stability of laser ranging through the examination of application examples, including Si-APD and InGaAs/InP APD. Finally, based on the technological needs of laser ranging, the future development directions of APDs are envisioned, aiming to provide a reference for the research of photodetectors in high-precision and high-frequency laser ranging applications.
  • Miniatura
    Item type: Artículo ,
    A new species of Astyanax (Characiformes, Characidae) from the rio Apiacás, rio Teles Pires basin, with a discussion on its phylogenetic position
    (National Research Council Canada-NRC Research Press, 2023-07)
    Ferreira, Katiane M.
    ;
    Lima, Flávio C. T.
    ;
    Ribeiro, Alexandre C.
    ;
    Flausino Junior, Nelson
    ;
    Machado, Francisco A.
    A new species of Astyanax is described from the rio Apiacás, a tributary of the rio Teles Pires, rio Tapajós basin, Mato Grosso state, Brazil. The new taxon can be distinguished from all congeners, except those belonging to the Astyanax bimaculatus species group and to the A. orthodus species group, by the presence of a horizontally elongated, rounded humeral blotch. The new taxon can be readily distinguished from all species belonging to the Astyanax bimaculatus species group and to the A. orthodus species group by presenting a pointed snout and by a distinct morphology in premaxillary and dentary teeth. We also present a hypothesis about the phylogenetic relationships of the new taxon within Astyanax.
  • Miniatura
    Item type: Artículo ,
    Social Stress Increases Anxiety by GluA1-Dependent Synaptic Strengthening of Ventral Tegmental Area Inputs to the Basolateral Amygdala
    (Elsevier Science Inc., 2025-04)
    Contesse, Thomas
    ;
    Gomes Ribeiro, Joana
    ;
    Royon, Lea
    ;
    Fofo, Hugo
    ;
    Braine, Anaelle
    BACKGROUND: Brain defensive mechanisms evolved to maintain low levels of state anxiety. However, risk factors such as stress exposure shifts activity within defensive circuits, resulting in increased anxiety. The amygdala is a crucial node for maintaining adaptive anxiety levels, and amygdala hyperactivity can lead to pathological anxiety through mechanisms that are not well understood. METHODS: We used chronic social defeat stress (CSD) in mice. We combined anatomical tracing methods, patch-clamp recordings and optogenetics to probe how synaptic inputs from the ventral tegmental area (VTA) to the basolateral amygdala (BLA) are affected by CSD. We performed in vivo fiber photometry recordings to track inputs onto basolateral amygdala. Array tomography and electron microscopy were used to unravel the structural composition of VTA-BLA synapses. RESULTS: We identified the VTA as a source of glutamatergic inputs to the BLA potentiated by stress. In turn, inputs from mPFC were not potentiated. BLA-projecting VTA glutamatergic neurons are activated by social stress, increasing their excitability and synaptic strength. In vivo potentiation of VTA glutamatergic inputs in the BLA is sufficient to increase anxiety. We showed that stress-induced synaptic strengthening is mediated by insertion of GluA1-containing AMPA receptors. Impeding GluA1 subunit trafficking in BLA neurons with VTA upstream inputs prevents stress-induced increase in synaptic firing and anxiety. CONCLUSIONS: Potentiation of VTA inputs increases synaptic integration, enhancing amygdala activity and promoting maladaptive anxiety. Understanding the impact of amygdala hyperactivity could lead to targeted therapies, restoring circuit balance and offering new precision medicine approaches for anxiety disorders.