2 research outputs found
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 lightāmatter 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 electronāelectron correlations via
X-ray absorption spectroscopy
Branimycins B and C, Antibiotics Produced by the Abyssal Actinobacterium <i>Pseudonocardia carboxydivorans</i> Mā227
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 AvileĢs 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