Themed collection 2020 Perspective article collection

Neither the thermodynamically determined probability isotherm nor its kinetically manifest rate isotherm can be applied to photo-absorptive reactions such that the participants, including photons, may be treated as if they were chemical reactants.

Phytochromes are red light-sensing photoreceptors. Here we review the current understanding of phytochrome photoactivation, with a special focus on bacteriophytochromes and their crystallographic studies.

Oral lichen planus (OLP) is a chronic inflammatory and immune-mediated disease affecting the oral mucosa.

There is evidence that other wavelengths beyond the traditional germicidal 254 nm UVC – namely far UVC (222 nm), ultraviolet B, ultraviolet A, visible light, and infrared radiation – have germicidal properties; however, data on UVC is the most robust.

This paper summarizes the recent possibilities to use measurements of ambient UV radiation for estimations of the personal UV exposure of people.

XPDT does not end with killing of cancer cells. Its effects and safety are to be tracked down to excretion.

Molecular engineering for the design of caged compounds leading to acute quantification of the uncaging events by fluorescence are discussed. This should lead to an easy access to photoactivation protocols for future applications of the uncaging concept.

Delivery light to deep tissues in vivo is a challenge. Sonoluminescence, the transduction of sound into light via the intermediate step of cavitation bubble collapse, might be a new endeavour to face this issue.

Ultraviolet (UV) radiation modulates cutaneous lipids which in turn mediates immune suppression – a key mechanism conferring both detrimental and beneficial impacts of sun exposure on human health.

Ultraviolet germicidal irradiation is one method for decontamination of N-95 filtering facepiece respirators to facilitate reuse during the COVID-19 pandemic. Other techniques include hydrogen peroxide vaporization, microwave-generated steaming, and dry heating.

Many animals under human care are kept indoors to prevent infectious diseases, to facilitate environment control, or due to the lifestyle of their owners. This article will review published information about ultraviolet effects in vertebrate animals.

This review is devoted to the fluorescence recovery protein, which efficiently regulates the orange carotenoid protein-based photoprotection mechanism in cyanobacteria and has widespread homologous genes with yet unknown functions.

This assessment provides an update of the interactive effects of solar ultraviolet (UV) radiation, stratospheric ozone, and climate change on human health, terrestrial and aquatic ecosystems, biochemical cycles, air quality, and material damage.

Here we present an overview of the composition and organization of photosynthetic protein complexes in thylakoid membrane and discuss the consequences of the light-induced protein network re-organization to the thylakoid membrane ultrastructure.

Critical evaluation of “new” and “old” models of cyanobacterial state transitions. Phycobilisome and membrane contributions to this mechanism are addressed. The signaling transduction pathway is discussed.

Calculations are providing more and more useful insights into the interaction between light and DNA quadruplexes.

Perspective of research directions exploring purple bacteria photo-bioelectrochemistry: from harvesting photoexcited electrons to bioelectrochemical systems development.

Photo-excitation of electron donor–acceptor systems can lead to the generation of a charge separated state (CT). Sometimes the charge recombination occurs mainly to the local triplet excited state (T₁). How does the spin flip?

Changes in relative abundance of bacterial phyla in faecal samples from humans and mice exposed to UV radiation.