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https://www.readbyqxmd.com/read/30019439/synthesis-of-cyclic-compounds-via-photoinduced-radical-cyclization-cascade-of-c-c-bonds
#1
REVIEW
Yating Zhao, Yanwen Lv, Wujiong Xia
Cyclic compounds constitute a great important class of substances in the science of medicine and biology, which renders the research on facile and efficient construction of such complex scaffolds from simple starting materials to be hot and appealing. Recently, the radical cascade reaction involving multiple bond formation/cleavage has emerged as an ideal and powerful route to give high-value cyclic products, along with diminished cost and waste. As a simple and benign methodology, photoredox catalysis offers a readily available access to the generation of radical species...
July 18, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29946977/the-chemical-biology-and-coordination-chemistry-of-putrebactin-avaroferrin-bisucaberin-and-alcaligin
#2
REVIEW
Rachel Codd, Cho Zin Soe, Amalie A H Pakchung, Athavan Sresutharsan, Christopher J M Brown, William Tieu
Dihydroxamic acid macrocyclic siderophores comprise four members: putrebactin (putH2 ), avaroferrin (avaH2 ), bisucaberin (bisH2 ), and alcaligin (alcH2 ). This mini-review collates studies of the chemical biology and coordination chemistry of these macrocycles, with an emphasis on putH2 . These Fe(III)-binding macrocycles are produced by selected bacteria to acquire insoluble Fe(III) from the local environment. The macrocycles are optimally pre-configured for Fe(III) binding, as established from the X-ray crystal structure of dinuclear [Fe2 (alc)3 ] at neutral pH...
June 26, 2018: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/29875637/input-convergence-synaptic-plasticity-and-functional-coupling-across-hippocampal-prefrontal-thalamic-circuits
#3
REVIEW
Lezio S Bueno-Junior, Joao P Leite
Executive functions and working memory are long known to involve the prefrontal cortex (PFC), and two PFC-projecting areas: midline/paramidline thalamus (MLT) and cornus ammonis 1 (CA1)/subiculum of the hippocampal formation (HF). An increasing number of rodent electrophysiology studies are examining these substrates together, thus providing circuit-level perspectives on input convergence, synaptic plasticity and functional coupling, as well as insights into cognition mechanisms and brain disorders. Our review article puts this literature into a method-oriented narrative...
2018: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29755542/design-synthesis-and-antitubercular-evaluation-of-novel-series-of-pyrazinecarboxamide-metal-complexes
#4
Mohsin Ali, Mansoor Ahmed, Saleem Hafiz, Mustafa Kamal, Majid Mumtaz, Seyed Abdulmajid Ayatollahi
The interest in the synthesis of metallic complexes of different drugs to make them more efficient in biological environment of the human body is seen for the last few decades. Wide range of metal complexes are already used in clinical practice which encourages additional research for innovating new metal based drugs, such as metal-mediated antibiotics, anti-parasitic, antiviral, antibacterial, and anticancer compounds. Tuberculosis has been known as one of the most disastrous disease putting burden on health system worldwide...
2018: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29740396/redox-dependent-inflammation-in-islet-transplantation-rejection
#5
REVIEW
Jessie M Barra, Hubert M Tse
Type 1 diabetes is an autoimmune disease that results in the progressive destruction of insulin-producing pancreatic β-cells inside the islets of Langerhans. The loss of this vital population leaves patients with a lifelong dependency on exogenous insulin and puts them at risk for life-threatening complications. One method being investigated to help restore insulin independence in these patients is islet cell transplantation. However, challenges associated with transplant rejection and islet viability have prevented long-term β-cell function...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29736706/nutrient-stress-small-molecule-screening-platform-for-escherichia-coli
#6
Sara S El Zahed, Garima Kumar, Madeline Tong, Eric D Brown
Clinically approved antibiotics target a narrow spectrum of cellular processes, namely cell wall synthesis, DNA replication, and protein synthesis. Numerous screens have been designed to identify inhibitors that target one of these cellular processes. Indeed, this narrow range of drug mechanisms and a reliance on chemical classes discovered many decades ago are thought to be principally responsible for the current crisis of antibiotic drug resistance. Seeking to expand the target base of antibacterial drug discovery, we developed a nutrient stress screening platform that identifies inhibitors of the growth of in Escherichia coli under nutrient limitation...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29716144/all-optical-transistor-based-on-rydberg-atom-assisted-optomechanical-system
#7
Yi-Mou Liu, Xue-Dong Tian, Jing Wang, Chu-Hui Fan, Feng Gao, Qian-Qian Bao
We study the optical response of a double optomechanical cavity system assisted by two Rydberg atoms. The target atom is only coupled with one side cavity by a single cavity mode, and gate one is outside the cavities. It has been realized that a long-range manipulation of optical properties of a hybrid system, by controlling the Rydberg atom decoupled with the optomechanical cavity. Switching on the coupling between atoms and cavity mode, the original spatial inversion symmetry of the double cavity structure has been broken...
April 30, 2018: Optics Express
https://www.readbyqxmd.com/read/29697250/effects-of-nanofiber-architecture-and-antimony-doping-on-the-performance-of-lithium-rich-layered-oxides-enhancing-lithium-diffusivity-and-lattice-oxygen-stability
#8
Ruizhi Yu, Zhijuan Zhang, Sidra Jamil, Jiancheng Chen, Xiaohui Zhang, Xianyou Wang, Zhenhua Yang, Hongbo Shu, Xiukang Yang
Li-rich layered oxides (LLOs) with high specific capacities are favorable cathode materials with high-energy density. Unfortunately, the drawbacks of LLOs such as oxygen release, low conductivity, and depressed kinetics for lithium ion transport during cycling can affect the safety and rate capability. Moreover, they suffer severe capacity and voltage fading, which are major challenges for the commercializing development. To cure these issues, herein, the synthesis of high-performance antimony-doped LLO nanofibers by an electrospinning process is put forward...
May 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29694014/indigoid-photoswitches-visible-light-responsive-molecular-tools
#9
Christian Petermayer, Henry Dube
Indigoid photoswitches comprise a class of chromophores that are derived from the parent and well-known indigo dye. Different from most photoswitches their core structures absorb in the visible region of the spectrum in both isomeric states even without substitutions, which makes them especially interesting for applications not tolerant of high-energy UV light. Also different from most current photoswitching systems, they provide highly rigid structures that undergo large yet precisely controllable geometry changes upon photoisomerization...
May 15, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29625876/recycling-of-polyurethanes-from-laboratory-to-industry-a-journey-towards-the-sustainability
#10
REVIEW
D Simón, A M Borreguero, A de Lucas, J F Rodríguez
The recycling of any kind of plastic to convert it in valuable products is one of the main challenges of today's society. Besides, if the recycling process is itself green, then it would be a great achievement. This paper reviews the way covered from the first attempts of reusing the polyurethane (PU) scraps as a filler for cushions to the last chemical routes employing green recycling agents. Polyurethane is the 6th most used polymer all over the world with a production of 18 millions tons per year, which means a daily production of PU specialties greater than 1 million of cubic meters, equivalent to the volume of the Empire State Building...
June 2018: Waste Management
https://www.readbyqxmd.com/read/29589019/synthesis-properties-and-formation-mechanism-of-mn-doped-zn-2-sio-4-nanowires-and-associated-heterostructures
#11
Haiqing Liu, Dominic Moronta, Luyao Li, Shiyu Yue, Stanislaus S Wong
In this work, we have put forth a facile hydrothermal approach to synthesize an array of one-dimensional (1D) Mn-doped Zn2SiO4 nanostructures. Specifically, we have probed and correlated the effects of controllable reaction parameters such as the pH and Mn dopant concentrations with the resulting crystal structures and morphologies of the products obtained. Based upon our results, we find that careful tuning of the pH versus the Mn dopant level gives rise to opposite trends with respect to the overall size of the resulting one-dimensional nanostructures...
April 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29562514/amyloid-%C3%AE-and-tau-in-alzheimer-s-disease-novel-pathomechanisms-and-non-pharmacological-treatment-strategies
#12
Rebecca M Nisbet, Jürgen Götz
Accumulation of the peptide amyloid-β (Aβ) and the protein tau in Alzheimer's disease (AD) brains is a gradual process that involves the post-translational modification and assembly of monomeric forms into larger structures that eventually form fibrillar inclusions. This process is thought to both drive and initiate AD. However, why the axonally enriched tau in the course of AD accumulates in the somatodendritic domain is not fully understood. We discuss new data that provide a possible explanation that involves de novo protein synthesis, induced by Aβ and mediated through the kinase Fyn...
2018: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29522440/do-technical-aids-for-patient-handling-prevent-musculoskeletal-complaints-in-health-care-workers-a-systematic-review-of-intervention-studies
#13
REVIEW
Janice Hegewald, Wera Berge, Philipp Heinrich, Ronny Staudte, Alice Freiberg, Julia Scharfe, Maria Girbig, Albert Nienhaus, Andreas Seidler
The physical load ensuing from the repositioning and moving of patients puts health care workers at risk of musculoskeletal complaints. Technical equipment developed to aid with patient handling should reduce physical strain and workload; however, the efficacy of these aids in preventing musculoskeletal disorders and complaints is still unclear. A systematic review of controlled intervention studies was conducted to examine if the risk of musculoskeletal complaints and disorders is reduced by technical patient handling equipment...
March 9, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29516724/divergent-strategy-in-natural-product-total-synthesis
#14
Lei Li, Zhuang Chen, Xiwu Zhang, Yanxing Jia
The divergent total syntheses of complex natural products from a common intermediate have attracted enormous attention in the chemical community in the past few years because it can improve the efficiency of chemical synthesis. A number of powerful and unified strategies have been developed by emulating the natural biosynthesis or through innovative transformations. This review focuses on the total synthesis of natural products by applying divergent strategies and the literature covering from 2013 to June 2017...
April 11, 2018: Chemical Reviews
https://www.readbyqxmd.com/read/29355307/fluorescent-hydrogel-generated-conveniently-from-a-perylene-tetracarboxylate-derivative-of-titanium-iv-alkoxide
#15
Dan-Hong Zou, Peng Wang, Wen Luo, Jin-Le Hou, Qin-Yu Zhu, Jie Dai
Organic gelators and metal-coordination frameworks based on perylene derivatives as functional materials have attracted great attention because of their intense fluorescence emission as well as unique electronic and photonic properties. We report here the structures and properties of a luminescent titanium(IV) coordination compound of a perylene tetracarboxylate (PTC) derivative, [Ti2 (Oi Pr)6 (L1 )(phen)2 ] (1), along with its two naphthalene analogues, [Ti2 (Oi Pr)6 (L2 )(phen)2 ] (2) and [Ti2 (Oi Pr)6 (L2 )(bpy)2 ] (3), where L1 = 3,9-dicarboxylate-(4,10-diisopropanolcarboxylate)perylene, phen = 1,10-phenanthroline, L2 = 1,5-dicarboxylate-(2,6-diisopropanolcarboxylate)naphthalene, and bpy = 2,2'-bipyridine...
February 5, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29320758/polymerase-epsilon-mutations-and-concomitant-%C3%AE-2-microglobulin-mutations-in-cancer
#16
Ioannis A Voutsadakis
Mutations in the exonuclease domain of polymerase epsilon (POLE), an enzyme of DNA synthesis, are involved in a newly described syndrome of colorectal polyposis and cancer, and have been associated with a high mutation burden with or without microsatellite instability (MSI) phenotype. The exonuclease domain of POLE executes a proofreading function that decreases the mutation rate during DNA replication by an estimated of one to two orders. The high mutation burden resulting from its loss of function could create a load of neo-antigens that would put the neoplastic cells in severe disadvantage of an immune attack if properly presented to the immune system...
March 20, 2018: Gene
https://www.readbyqxmd.com/read/29237496/government-policy-interventions-to-reduce-human-antimicrobial-use-protocol-for-a-systematic-review-and-meta-analysis
#17
REVIEW
Susan Rogers Van Katwyk, Jeremy M Grimshaw, Marc Mendelson, Monica Taljaard, Steven J Hoffman
BACKGROUND: Antimicrobial resistance (AMR) is a recognized threat to global public health. Increasing AMR and a dry pipeline of novel antimicrobial drugs have put AMR in the international spotlight. One strategy to combat AMR is to reduce antimicrobial drug consumption. Governments around the world have been experimenting with different policy interventions, such as regulating where antimicrobials can be sold, restricting the use of last-resort antimicrobials, funding AMR stewardship programs, and launching public awareness campaigns...
December 13, 2017: Systematic Reviews
https://www.readbyqxmd.com/read/29194398/synthesis-of-rhizobial-exopolysaccharides-and-their-importance-for-symbiosis-with-legume-plants
#18
REVIEW
Małgorzata Marczak, Andrzej Mazur, Piotr Koper, Kamil Żebracki, Anna Skorupska
Rhizobia dwell and multiply in the soil and represent a unique group of bacteria able to enter into a symbiotic interaction with plants from the Fabaceae family and fix atmospheric nitrogen inside de novo created plant organs, called nodules. One of the key determinants of the successful interaction between these bacteria and plants are exopolysaccharides, which represent species-specific homo- and heteropolymers of different carbohydrate units frequently decorated by non-carbohydrate substituents. Exopolysaccharides are typically built from repeat units assembled by the Wzx/Wzy-dependent pathway, where individual subunits are synthesized in conjunction with the lipid anchor undecaprenylphosphate (und-PP), due to the activity of glycosyltransferases...
December 1, 2017: Genes
https://www.readbyqxmd.com/read/29169395/genome-wide-analysis-of-e-coli-cell-gene-interactions
#19
S Cardinale, G Cambray
BACKGROUND: The pursuit of standardization and reliability in synthetic biology has achieved, in recent years, a number of advances in the design of more predictable genetic parts for biological circuits. However, even with the development of high-throughput screening methods and whole-cell models, it is still not possible to predict reliably how a synthetic genetic construct interacts with all cellular endogenous systems. This study presents a genome-wide analysis of how the expression of synthetic genes is affected by systematic perturbations of cellular functions...
November 23, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/29163917/3d-hole-transporting-materials-based-on-coplanar-quinolizino-acridine-for-highly-efficient-perovskite-solar-cells
#20
Mingdao Zhang, Gang Wang, Danxia Zhao, Chengyan Huang, Hui Cao, Mindong Chen
Over the past five years, perovskite solar cells (PSCs) have gained intense worldwide attention in the photovoltaic community due to their low cost and high power conversion efficiencies (PCEs). One of the most significant issues in achieving high PCEs of PSCs is the development of suitable low-cost hole-transporting materials (HTMs). Here, we put forward a new concept of HTMs for PSCs: a 3D structure with a core of coplanar quinolizino acridine, derived from the conventional concept of 2D triphenylamine HTMs...
November 1, 2017: Chemical Science
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