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Today: 12 June 2021, Saturday.

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#1

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Name	Open questions on chemistry in the synthesis and characterization of superheavy elements \| Communications Chemistry
Description	Superheavy elements are ideal for furthering our understanding of relativistic effects and how they affect physicochemical properties of heavy elements. In this comment, the author discusses the role of chemistry in the synthesis of new elements before addressing the future challenges concerning the chemical characterization of superheavy elements. #Chemicals
Field	# Chemicals
Updated	10 June 2021

#2

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Name	Open questions on the photophysics of ultrafast singlet fission \| Communications Chemistry
Description	Ultrafast singlet fission has the potential to facilitate highly efficient photovoltaics through the multiplication of excitons in organic molecular architectures. Here, we consider the interplay of molecular structure and intermolecular coupling toward enabling ultrafast singlet fission and discuss open questions in the field. #Chemicals
Field	# Chemicals
Updated	10 June 2021

#3

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Name	Robotic chemist may be able to recreate Earth’s primordial soup \| New Scientist
Description	A robot that can mix up organic materials and small molecules could help solve the mystery of how life first emerged on Earth #Chemicals
Field	# Chemicals
Updated	10 June 2021

#4

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Name	Handling heme with care \| Nature Chemical Biology
Description	Heme-containing proteins support a broad range of cellular functions. A new crystal structure explains how an integral-membrane heme lyase attaches the hydrophobic heme to soluble proteins. #Chemicals
Field	# Chemicals
Updated	08 June 2021

#5

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Name	Cell Factories: Genetically "Switching On" Bacteria to Produce High-Value Chemicals
Description	TBD #Chemicals
Field	# Chemicals
Updated	08 June 2021

#6

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Name	Designing an irreversible metabolic switch for scalable induction of microbial chemical production \| Nature Communications
Description	Bacteria can be harnessed to synthesise high-value chemicals. A promising strategy for increasing productivity uses inducible control systems to switch metabolism from growth to chemical synthesis once a large population of cell factories are generated. However, use of expensive chemical inducers limits scalability of this approach for biotechnological applications. Switching using cheap nutrients is an appealing alternative, but their tightly regulated uptake and consumption again limits scalability. Here, using mathematical models of fatty acid uptake in E. coli as an exemplary case study, we unravel how the cell’s native regulation and program of induction can be engineered to minimise inducer usage. We show that integrating positive feedback loops into the circuitry creates an irreversible metabolic switch, which, requiring only temporary induction, drastically reduces inducer usage. Our proposed switch should be widely applicable, irrespective of the product of interest, and brings closer the realization of scalable and sustainable microbial chemical production. A promising strategy to increase product synthesis from bacteria uses inducible systems to switch metabolism to production. Here, the authors use models to show how engineering positive feedback loops into the genetic circuitry creates a switch that requires only temporary induction with a cheap nutrient to switch metabolism irreversibly, and so drastically reduce inducer use and cost. #Chemicals
Field	# Chemicals
Updated	08 June 2021

#7

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Name	Carbon dioxide levels hit 50 percent higher than preindustrial time
Description	The annual peak of global heat-trapping carbon dioxide in the air has reached another dangerous milestone: 50 percent higher than when the industrial age #Chemicals
Field	# Chemicals
Updated	08 June 2021

#8

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Name	Resonant X-ray emission spectroscopy from broadband stochastic pulses at an X-ray free electron laser \| Communications Chemistry
Description	Hard X-ray spectroscopy is an element specific probe of electronic state, but signals are weak and require intense light to study low concentration samples. Free electron laser facilities offer the highest intensity X-rays of any available light source. The light produced at such facilities is stochastic, with spikey, broadband spectra that change drastically from shot to shot. Here, using aqueous ferrocyanide, we show that the resonant X-ray emission (RXES) spectrum can be inferred by correlating for each shot the fluorescence intensity from the sample with spectra of the fluctuating, self-amplified spontaneous emission (SASE) source. We obtain resolved narrow and chemically rich information in core-to-valence transitions of the pre-edge region at the Fe K-edge. Our approach avoids monochromatization, provides higher photon flux to the sample, and allows non-resonant signals like elastic scattering to be simultaneously recorded. The spectra obtained match well with spectra measured using a monochromator. We also show that inaccurate measurements of the stochastic light spectra reduce the measurement efficiency of our approach. X-ray absorption and X-ray free electron lasers are important tools to study chemical and structural dynamics, but spectral details like pre-edge features are inherently hard to detect. Here, the authors show that stochastic spectroscopy can yield similar spectral information to monochromatic spectroscopies, while increasing signal yield and reducing acquisition time. #Chemicals
Field	# Chemicals
Updated	07 June 2021

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