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https://www.readbyqxmd.com/read/28445647/how-will-copper-contamination-constrain-future-global-steel-recycling
#1
Katrin Ellen Daehn, Andre Cabrera Serrenho, Julian M Allwood
Copper in steel causes metallurgical problems, but is pervasive in end-of-life scrap and cannot currently be removed commercially once in the melt. Contamination can be managed to an extent by globally trading scrap for use in tolerant applications and dilution with primary iron sources. However, the viability of long-term strategies can only be evaluated with a complete characterization of copper in the global steel system and this is presented in this paper. The copper concentration of flows along the 2008 steel supply chain is estimated from a survey of literature data and compared with estimates of the maximum concentration that can be tolerated in steel products...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28445146/autophagy-and-mitophagy-in-the-context-of-doxorubicin-induced-cardiotoxicity
#2
REVIEW
Navid Koleini, Elissavet Kardami
Doxorubicin (Dox) is a cytotoxic drug widely incorporated in various chemotherapy protocols. Severe side effects such as cardiotoxicity, however, limit Dox application. Mechanisms by which Dox promotes cardiac damage and cardiomyocyte cell death have been investigated extensively, but a definitive picture has yet to emerge. Autophagy, regarded generally as a protective mechanism that maintains cell viability by recycling unwanted and damaged cellular constituents, is nevertheless subject to dysregulation having detrimental effects for the cell...
April 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/28444937/soluble-inorganic-nanoparticle-constructed-porous-coordination-frameworks-as-homogenized-heterogeneous-photocatalysts-for-suzuki-coupling-reaction-under-near-infrared-light
#3
Baodui Wang, Yuting Luo, Yong Peng, Weisheng Liu, Fengjuan Chen
Self-assembly has emerged as a promising method to control the structure and properties of ensembles of inorganic nanoparticles (NPs) for exploiting their collective effects. However, the rational assembly of inorganic NPs into soluble porous architectures as homogenized heterogeneous catalyst has been less studied. Here, we show that inorganic NPs can be used for the assembly of soluble porous coordination frameworks (PCFs) by atom-scale interfacial coordination-driven assembly strategy. Given large pore size, high dispersity in solution, strong absorption in the near-infrared range (NIR), and a long living electron-hole pair, the obtained soluble framework can serve as a platform for homogenize heterogeneous photocatalysts, which exhibited excellent activity, high apparent quantum efficiency, and recyclability to catalyze the noble metal free Suzuki coupling reaction under NIR light at room temperature...
April 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28444696/self-assembly-of-luminescent-lanthanide-mesocates-as-efficient-catalysts-for-transforming-co2-into-cyclic-carbonates
#4
Qingxin Han, Li Wang, Zhaohua Shi, Cong Xu, Zhe Dong, Zuolin Mou, Weisheng Liu
Four di-nuclear lanthanide mesocates have been fabricated through a spontaneous self-assembly method, and the formation of these complexes was well studied by their absorption and emission spectra. These stable complexes also exhibit superior catalytic performance and excellent recyclability in catalyzing the coupling reaction between epoxides and CO2. Meanwhile the catalyst can be prepared large scale. Moreover, Yb-complex and Lu-complex can feature near-infrared and visible emission, respectively, the intensity and life time of which could be used to identify the catalysts...
April 25, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28443601/self-assembly-of-defect-rich-graphene-oxide-nanosheets-with-na-sub-2-sub-ti-sub-3-sub-o-sub-7-sub-nanowires-and-their-superiorly-absorptive-capacity-towards-to-toxic-dyes
#5
Yibai Sun, Wanlin Fu, Yunqian Dai, Yiyang Huang, Jie Zhou, Chengqian Huang, Chongya Yang, Meiyou Huang, Rongwei Ma, Baoping Lin
Graphene sheets, a flexible two-dimensional material with excellent absorptive capacity, have great potential as absorbing materials. However, it has always been suffering from irreversible aggregation and thus lose the abundant active sites and large surface area. In this paper, large-scale graphene oxide (GO) sheets were cut and reduced into tiny reduced graphene oxide (RGO) sheets by a cell-break sonicator, for producing numerous defects which is the center of chemisorption. Furthermore, sodium titanate nanowires functioned as a framework help to disperse tiny RGO sheets uniformly...
April 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28443502/fe3o4-sio2-kit-6-as-an-efficient-and-reusable-catalyst-for-the-synthesis-of-novel-derivatives-of-3-3-aryl-1-phenyl-1h-pyrazol-4-yl-methylene-bis-1h-indole
#6
Mohammad Nikpassand, Leila Zare Fekri, Mozhdeh Nabatzadeh
Korea advanced institute of science and technology cubic ordered mesoporous silica (KIT-6 mesoporous) silica coated magnetite nanoparticles, is an effective, eco-benign and recyclable catalyst for the electrophilic substitution reactions of indoles with various synthetized aldehydes to afford the corresponding novel diindolylmethanes in high yields and short reaction times. The catalyst can be recovered and reused without loss of activity. The work-up of the reaction consists of a simple separation, followed by concentration of the crude product and purification...
April 25, 2017: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/28443330/mechanisms-by-which-salt-concentration-moderates-the-dynamics-of-human-serum-transferrin
#7
Haleh Abdizadeh, Ali Rana Atilgan, Canan Atilgan
The dynamical and thermodynamic behavior of human transferrin (hTf) protein in saline aqueous solution of various concentrations is studied. hTf is an essential transport protein circulating iron in the blood and delivering it to tissues. It displays highly pH dependent cooperativity between the two lobes each carrying an iron, and forms a tight complex with the receptor during endocytosis, eventually recycled to the serum after iron release. Molecular dynamics simulations are used to investigate the effects of the amount of salt on protein conformation and dynamics to analyze the structure-function relationship in free hTf at serum pH...
April 26, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28442497/an-in-silico-model-of-retinal-cholesterol-dynamics-rcd-model-insights-into-the-pathophysiology-of-dry-age-related-macular-degeneration
#8
Seyedeh Maryam Zekavat, James Lu, Cyrille Maugeais, Norman A Mazer
We developed an in-silico mathematical model of retinal cholesterol (Ch) dynamics (RCD) to quantify the physiological rate of Ch turnover in the rod outer segment (ROS), the lipoprotein transport mechanisms by which Ch enters and leaves the outer retina, and the rates of drusen growth and macrophage-mediated clearance in dry Age-Related Macular Degeneration (AMD). Based on existing experimental data and mechanistic hypotheses, we estimate the Ch turnover rate in the ROS to be 1-6 pg/mm2/min, dependent on the rate of Ch recycling in the outer retina, and find comparable rates for LDL receptor-mediated endocytosis of Ch by the retinal pigment epithelium (RPE), ABCA1-mediated Ch transport from the RPE to outer retina, ABCA1-mediated Ch efflux from the RPE to choroid, and the secretion of 70 nm ApoB-Ch particles from the RPE...
April 25, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28441759/synaptic-homeostasis-and-its-immunological-disturbance-in-neuromuscular-junction-disorders
#9
REVIEW
Masaharu Takamori
In the neuromuscular junction, postsynaptic nicotinic acetylcholine receptor (nAChR) clustering, trans-synaptic communication and synaptic stabilization are modulated by the molecular mechanisms underlying synaptic plasticity. The synaptic functions are based presynaptically on the active zone architecture, synaptic vesicle proteins, Ca(2+) channels and synaptic vesicle recycling. Postsynaptically, they are based on rapsyn-anchored nAChR clusters, localized sensitivity to ACh, and synaptic stabilization via linkage to the extracellular matrix so as to be precisely opposed to the nerve terminal...
April 24, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28441569/the-cytoskeleton-autophagy-connection
#10
REVIEW
David J Kast, Roberto Dominguez
Actin cytoskeleton dynamics play vital roles in most forms of intracellular trafficking by promoting the biogenesis and transport of vesicular cargoes. Mounting evidence indicates that actin dynamics and membrane-cytoskeleton scaffolds also have essential roles in macroautophagy, the process by which cellular waste is isolated inside specialized vesicles called autophagosomes for recycling and degradation. Branched actin polymerization is necessary for the biogenesis of autophagosomes from the endoplasmic reticulum (ER) membrane...
April 24, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28441419/correction-fluoride-regulate-osteoblastic-transforming-growth-factor-%C3%AE-1-signaling-by-mediating-recycling-of-the-type-i-receptor-alk5
#11
Chen Yang, Yan Wang, Hui Xu
[This corrects the article DOI: 10.1371/journal.pone.0170674.].
2017: PloS One
https://www.readbyqxmd.com/read/28440944/the-regulatory-significance-of-tag-recycling-in-the-mycobacterial-pup-proteasome-system
#12
Yifat Elharar, Shai Schlussel, Nir Hecht, Michael M Meijler, Eyal Gur
Pup, a ubiquitin analog, tags proteins for degradation by the bacterial proteasome. As an intracellular proteolytic system, the Pup-proteasome system (PPS) must be carefully regulated to prevent excessive protein degradation. Currently, those factors underlying PPS regulation remain poorly understood. Here, experimental analysis combined with theoretical modeling of in vivo protein pupylation revealed how the basic PPS design allows stable and controlled protein pupylation. Specifically, the recycling of Pup when targets are degraded allows the PPS to maintain steady state levels of protein pupylation and degradation at a rate limited by proteasome function, and at a pupylome level limited by Pup concentrations...
April 25, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28440929/marine-and-freshwater-microplastic-research-in-south-africa
#13
Carina Verster, Karin Minnaar, Hindrik Bouwman
South Africa has a vibrant plastics manufacturing industry, but recycling is limited and insufficient with a notable proportion of the unmanaged waste entering the environment. South Africa is a developing country with microplastics research in its inception. Very little is known about freshwater microplastics, and studies on South African marine microplastics are limited but actively being pursued. In a water-scarce country, protection of freshwater resources remains a priority, but in the face of other socioeconomic issues (poverty, unemployment, and HIV/AIDS), it receives insufficiently effective attention...
May 2017: Integrated Environmental Assessment and Management
https://www.readbyqxmd.com/read/28439081/long-lasting-neutralization-of-c5-by-sky59-a-novel-recycling-antibody-is-a-potential-therapy-for-complement-mediated-diseases
#14
Taku Fukuzawa, Zenjiro Sampei, Kenta Haraya, Yoshinao Ruike, Meiri Shida-Kawazoe, Yuichiro Shimizu, Siok Wan Gan, Machiko Irie, Yoshinori Tsuboi, Hitoshi Tai, Tetsushi Sakiyama, Akihisa Sakamoto, Shinya Ishii, Atsuhiko Maeda, Yuki Iwayanagi, Norihito Shibahara, Mitsuko Shibuya, Genki Nakamura, Takeru Nambu, Akira Hayasaka, Futa Mimoto, Yuu Okura, Yuji Hori, Kiyoshi Habu, Manabu Wada, Takaaki Miura, Tatsuhiko Tachibana, Kiyofumi Honda, Hiroyuki Tsunoda, Takehisa Kitazawa, Yoshiki Kawabe, Tomoyuki Igawa, Kunihiro Hattori, Junichi Nezu
Dysregulation of the complement system is linked to the pathogenesis of a variety of hematological disorders. Eculizumab, an anti-complement C5 monoclonal antibody, is the current standard of care for paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS). However, because of high levels of C5 in plasma, eculizumab has to be administered biweekly by intravenous infusion. By applying recycling technology through pH-dependent binding to C5, we generated a novel humanized antibody against C5, SKY59, which has long-lasting neutralization of C5...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28438268/fungal-biorecovery-of-gold-from-e-waste
#15
Saskia Bindschedler, Thi Quynh Trang Vu Bouquet, Daniel Job, Edith Joseph, Pilar Junier
Waste electric and electronic devices (e-waste) represent a source of valuable raw materials of great interest, and in the case of metals, e-waste might become a prized alternative source. Regarding gold, natural ores are difficult to mine due to their refractory nature and the richest ores have almost all been exploited. Additionally, some gold mining areas are present in geopolitically unstable regions. Finally, the gold mining industry produces toxic compounds, such as cyanides. As a result, the gold present in e-waste represents a nonnegligible resource (urban mining)...
2017: Advances in Applied Microbiology
https://www.readbyqxmd.com/read/28437744/fe-%C3%A2-ions-enhanced-catalytic-properties-of-bio-2co3-nanowires-and-mechanism-study-for-complete-degradation-of-xanthate
#16
Yujiao Guo, Kuixin Cui, Mingyi Hu, Shengming Jin
The wire-like Fe(3+)-doped (BiO)2CO3 photocatalyst was synthesized by a hydrothermal method. The photocatalytic property of Fe(3+)-doped (BiO)2CO3 nanowires was evaluated through degradation of sodium isopropyl xanthate under UV-visible light irradiation. The as-prepared Fe(3+)-doped (BiO)2CO3 nanowires were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) in detail...
April 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28437113/development-and-application-of-a-recyclable-high-load-magnetic-co-c-hybrid-romp-derived-benzenesulfonyl-chloride-reagent-and-utility-of-corresponding-analogues
#17
Saqib Faisal, Qin Zang, Pradip K Maity, Agnes Brandhofer, Patrick C Kearney, Oliver Reiser, Robert N Grass, Diana Stoianova, Paul R Hanson
The development and application of high-load, recyclable magnetic Co/C hybrid ROMP-derived benzenesulfonyl chloride and analogues is reported. The regeneration and utility of these reagents in the methylation/alkylation of various carboxylic acids is demonstrated via efficient retrieval of the magnetic reagent with a neodymium magnet. Additional reactions employing the analogue sulfonic acid and in situ generated magnetic benzenesulfonyl azide are also reported.
April 24, 2017: Organic Letters
https://www.readbyqxmd.com/read/28437087/al-coated-conductive-fibrous-filters-with-low-pressure-drop-for-efficient-electrostatic-capture-of-ultrafine-particulate-pollutants
#18
Dong Yun Choi, Soo-Ho Jung, Dong-Keun Song, Eun Jeong An, Duckshin Park, Tae-Oh Kim, Jae Hee Jung, Hye Moon Lee
Here, we demonstrate a new strategy of air filtration based on an Al-coated conductive fibrous filter for high efficient nanoparticulate removals. The conductive fibrous filter was fabricated by a direct decomposition of Al precursor ink, AlH3{O(C4H9)2}, onto surfaces of a polyester air filter via a cost-effective and scalable solution-dipping process. The prepared conductive filters showed a low sheet resistance (< 1.0 Ω sq(-1)), robust mechanical durability and high oxidative stability. By electrostatic force between the charged fibers and particles, the ultrafine particles of 30 - 400 nm in size were captured with a removal efficiency of ~99...
April 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28436498/integrative-meta-modeling-identifies-endocytic-vesicles-late-endosome-and-the-nucleus-as-the-cellular-compartments-primarily-directing-rtk-signaling
#19
Jared C Weddell, Princess I Imoukhuede
Recently, intracellular receptor signaling has been identified as a key component mediating cell responses for various receptor tyrosine kinases (RTKs). However, the extent each endocytic compartment (endocytic vesicle, early endosome, recycling endosome, late endosome, lysosome and nucleus) contributes to receptor signaling has not been quantified. Furthermore, our understanding of endocytosis and receptor signaling is complicated by cell- or receptor-specific endocytosis mechanisms. Therefore, towards understanding the differential endocytic compartment signaling roles, and identifying how to achieve signal transduction control for RTKs, we delineate how endocytosis regulates RTK signaling...
April 24, 2017: Integrative Biology: Quantitative Biosciences From Nano to Macro
https://www.readbyqxmd.com/read/28436220/metal-free-organocatalytic-oxidative-ugi-reaction-promoted-by-hypervalent-iodine
#20
Karandeep Singh, Amanpreet Kaur, Venus Singh Mithu, Siddharth Sharma
We report here a novel IBX promoted oxidative coupling of primary amines and its utilization to Ugi reaction. Advantageously, the reaction could be carried out in choline chloride-urea as a natural deep eutectic solvent. A range of imines and bis-amides from pseudo-four component oxidative Ugi reaction could be synthesized under mild and metal-free conditions. Advantageously, the oxidant (IBX) and solvent could be recycled up to five times with only a slight loss in activity.
April 24, 2017: Journal of Organic Chemistry
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