51 research outputs found
Coleta e conservação de germoplasma de plantas ornamentais, com ênfase em Alstroemeriaceae e Araceae.
Análise de constituintes voláteis presentes em raĂzes adventĂcias de espĂ©cies de Philodendron (Araceae) da mata atlântica - RJ.
Gill dimensions in near-term embryos of Amazonian freshwater stingrays (Elasmobranchii: Potamotrygonidae) and their relationship to the lifestyle and habitat of neonatal pups
A Positive Regulatory Loop between foxi3a and foxi3b Is Essential for Specification and Differentiation of Zebrafish Epidermal Ionocytes
BACKGROUND: Epidermal ionocytes play essential roles in the transepithelial transportation of ions, water, and acid-base balance in fish embryos before their branchial counterparts are fully functional. However, the mechanism controlling epidermal ionocyte specification and differentiation remains unknown. METHODOLOGY/PRINCIPAL FINDINGS: In zebrafish, we demonstrated that Delta-Notch-mediated lateral inhibition plays a vital role in singling out epidermal ionocyte progenitors from epidermal stem cells. The entire epidermal ionocyte domain of genetic mutants and morphants, which failed to transmit the DeltaC-Notch1a/Notch3 signal from sending cells (epidermal ionocytes) to receiving cells (epidermal stem cells), differentiates into epidermal ionocytes. The low Notch activity in epidermal ionocyte progenitors is permissive for activating winged helix/forkhead box transcription factors of foxi3a and foxi3b. Through gain- and loss-of-function assays, we show that the foxi3a-foxi3b regulatory loop functions as a master regulator to mediate a dual role of specifying epidermal ionocyte progenitors as well as of subsequently promoting differentiation of Na(+),K(+)-ATPase-rich cells and H(+)-ATPase-rich cells in a concentration-dependent manner. CONCLUSIONS/SIGNIFICANCE: This study provides a framework to show the molecular mechanism controlling epidermal ionocyte specification and differentiation in a low vertebrate for the first time. We propose that the positive regulatory loop between foxi3a and foxi3b not only drives early ionocyte differentiation but also prevents the complete blockage of ionocyte differentiation when the master regulator of foxi3 function is unilaterally compromised
Dissolved oxygen and ammonia levels in water that affect plasma ionic content and gallbladder bile in silver catfish
Floristic composition and spatial distribution of vascular epiphytes in the restingas of MaracanĂŁ, Brazil
Two new species of Philodendron (Araceae) from Brazil
Volume: 11Start Page: 102End Page: 10
NOMENCLATURE AND TAXONOMY OF PHILODENDRON HASTATUM K. KOCH & SELLO
ABSTRACT The paper discusses the taxonomy and nomenclature of Philodendron hastatum and aims to clarify the status of some other names often used to name specimens with similar leaf blade shape. A description of the species is provided based on the study of herbarium material
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