Theoretical Approach for Electron Dynamics and Ultrafast Spectroscopy (EDUS)

In this manuscript, we present a theoretical framework and its numerical implementation to simulate the out-of-equilibrium electron dynamics induced by the interaction of ultrashort laser pulses in condensed-matter systems. Our approach is based on evolving in real time the density matrix of the system in reciprocal space. It considers excitonic and nonperturbative light–matter interactions. We show some relevant examples that illustrate the efficiency and flexibility of the approach to describe realistic ultrafast spectroscopy experiments. Our approach is suitable for modeling the promising and emerging ultrafast studies at the attosecond time scale that aim at capturing the electron dynamics and the dynamical electron–electron correlations via X-ray absorption spectroscopy

Branimycins B and C, Antibiotics Produced by the Abyssal Actinobacterium <i>Pseudonocardia carboxydivorans</i> M‑227

Two new antibiotics, branimycins B (<b>2</b>) and C (<b>3</b>), were produced by fermentation of the abyssal actinobacterium <i>Pseudonocardia carboxydivorans</i> M-227, isolated from deep seawater of the Avilés submarine Canyon. Their structures were elucidated by HRMS and NMR analyses. These compounds exhibit antibacterial activities against a panel of Gram-positive bacteria, including <i>Corynebacterium urealyticum</i>, <i>Clostridium perfringens</i>, and <i>Micrococcus luteus</i>, and against the Gram-negative bacterium <i>Neisseria meningitidis.</i> Additionally, branimycin B displayed moderate antibacterial activity against other Gram-negative bacteria such as <i>Bacteroides fragilis</i>, <i>Haemophilus influenzae</i>, and <i>Escherichia coli</i>, and branimycin C against the Gram-positive <i>Enterococcus faecalis</i> and methicillin-sensitive and methicillin-resistant <i>Staphylococcus aureus.</i