Carlos Hotta

Contents Summary 1 I. Introduction 1 II. Concept of chronotoxicity within plant sciences 2 III. Circadian clock modulation of herbicide effectiveness 2 IV. Approaches to the timed application of agrochemicals 4 V. Conclusion and perspectives 6 Acknowledgements 6 References 6 I. Introduction Plant circadian clocks align physiology, metabolism, and development with 24 h environmental cycles.

Abstract Histones, the core components of nucleosomes, play an important role in chromatin structure and function through post-translational modifications (PTMs) that regulate gene expression without altering the DNA sequence.

Uma das questões mais debatidas atualmente é: deve-se usar a hidroxicloroquina no tratamento da Covid-19? Esta pergunta ainda é difícil de responder especialmente porque o debate científico tem sofrido interferência de discursos inflamados, por vezes ideológicos, apostas políticas mal pensadas e interesses econômicos não declarados.