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https://www.readbyqxmd.com/read/28081491/effect-of-humic-acid-based-amendments-with-foliar-application-of-zn-and-se-on-cd-accumulation-in-tobacco
#1
Yao Yu, Yanan Wan, Qi Wang, Huafen Li
The smoke of tobacco is a major source of exposure to Cd in humans and therefore it is urgent to find a way to a method to reduce Cd accumulation in tobacco. A four-month tobacco pot experiment was conducted to investigate the effects of two base treatments (humic acid-based amendments) and two foliar treatments (Zn and Se) on Cd uptake by tobacco. The results showed that Cd in tobacco was mainly transferred into leaves, which could be significantly reduced by both applied amendments. The Cd contents in leaves were reduced by up to 67%...
January 9, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28081489/protective-effect-of-chitosan-on-photosynthesis-and-antioxidative-defense-system-in-edible-rape-brassica-rapa-l-in-the-presence-of-cadmium
#2
Haiying Zong, Song Liu, Ronge Xing, Xiaolin Chen, Pengcheng Li
Chitosan (CTS) induces plant tolerance against several abiotic stresses, including salinity and drought exposure. However, the role of CTS in cadmium (Cd)-induced stress amelioration is largely unknown. In the present study, a hydroponic pot experiment was conducted to study the roles of CTS with different molecular weight (Mw) (10kDa,5kDa and 1kDa) in alleviating Cd toxicity in edible rape (Brassica rapa L .). The results showed that Cd stress significantly decreased plant growth, leaf chlorophyll contents and increased the malondialdehyde (MDA) level in rape leaves...
January 9, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28081456/robust-tough-and-anti-fatigue-cationic-latex-composite-hydrogels-based-on-dual-physically-cross-linked-networks
#3
Song Gu, Lijie Duan, Xiuyan Ren, Guang Hui Gao
Dual physically cross-linked hydrogels, which are triggered by cationic latexes as hydrophobic association and ionic crosslinking centers, were easily fabricated via a one-pot in situ polymerization method. First, the hydrophobic alkyl chains of hydrophobic monomers are adsorbed on the surface of latex microspheres and stabilized in the presence of surfactants, forming hydrophobic association centers as the first physical crosslinking points. Meanwhile, the anionic sulfate radicals dissociated by persulphate are attracted towards the cationic molecular chains of latex microspheres through ionic interactions, forming the secondary physical crosslinking centers, and initiate the copolymerization between acrylamide and hydrophobic vinyl monomers...
January 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28081272/individual-plasticity-of-the-shade-response-of-the-invasive-solidago-canadensis-in-china
#4
Leshan Du, Haiyan Liu, Ming Yan, Junmin Li, Junsheng Li
To evaluate the population variation, individual plasticity, and local adaptability of Solidago canadensis in response to shade treatment, we conducted a common pots experiment with a total of 150 ramets (5 genets, 15 populations, and 2 treatments) subjected to both control (natural light) and shady treatment (10% of natural light). Shade treatment significantly reduced growth and content of defense metabolites in S. canadensis. Compared to control, shading led to increased height, decreased basal diameter, increased leaf width, increased leaf length, increased chlorophyll content, stronger photosynthetic rate (Pn), stronger stomatal conductance (gs), and lower root to shoot ratio...
2017: PloS One
https://www.readbyqxmd.com/read/28080069/direct-construction-of-2-3-dihydroxy-2-3-diaryltetrahydrofurans-via-n-heterocyclic-carbene-base-mediated-domino-reactions-of-aromatic-aldehydes-and-vinyl-selenone
#5
Atanu Bhaumik, Ram Subhawan Verma, Bhoopendra Tiwari
A one-pot, stereoselective construction of 2,3-dihydroxy-2,3-diaryltetrahydrofurans has been achieved via N-heterocyclic carbene (NHC)/base-mediated domino reactions of aldehydes and vinyl selenone. The products containing two contiguous quaternary hydroxyl functionalities among the three stereocenters are obtained advantageously as either acetals or ketals through the formation of five new chemical bonds in a single operation. This report constitutes an altogether different reactivity of vinyl selenone in comparison with the corresponding sulfones and phosphonates under NHC/base-mediated reactions...
January 12, 2017: Organic Letters
https://www.readbyqxmd.com/read/28080068/transition-metal-free-redox-neutral-one-pot-c3-alkenylation-of-indoles-using-aldehydes
#6
Samrat Sahu, Ankush Banerjee, Modhu Sudan Maji
The synthesis of sensitive β-alkyl 3-vinylindoles having diverse functional groups with good selectivity remains a challenging task. Keeping the synthetic utility of 3-alkenylindoles in mind, we explored a unique approach to synthesize them from unprotected indoles in a domino fashion. A transition-metal-free C3-alkenylation of indole is reported by using sequential Brønsted acid/base catalysis. Several β-substituted 3-alkenylindoles and conjugated 1,3-dienes are synthesized by direct coupling of indole and readily available aliphatic aldehydes...
January 12, 2017: Organic Letters
https://www.readbyqxmd.com/read/28080033/solvent-templated-folding-of-perylene-bisimide-macrocycles-into-coiled-double-string-ropes-with-solvent-sensitive-optical-signatures
#7
Peter Spenst, Ryan M Young, Brian T Phelan, Michel Keller, Jakub Dostál, Tobias Brixner, Michael R Wasielewski, Frank Würthner
A series of semi-rigid perylene bisimide (PBI) macrocycles with varied ring size containing two to nine PBI chromophores were synthesized in a one-pot reaction and their photophysical properties were characterized by fluorescence, steady-state and transient absorption spectroscopy as well as femtosecond stimulated Raman spectroscopy. These macrocycles show solvent-dependent conformational equilibria and excited-state properties. In dichloromethane the macrocycles prevail in wide-stretched conformations and exhibit upon photoexcitation symmetry-breaking charge separation followed by charge recombination to triplet states, which photosensitize singlet oxygen formation...
January 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28079985/one-pot-bimetallic-pd-cu-catalyzed-synthesis-of-sulfonamides-from-boronic-acids-dabso-and-o-benzoyl-hydroxylamines
#8
Tao Tu, Haibo Zhu, Yajing Shen, Qinyue Deng, Changyu Huang
A practical and straightforward bimetallic Pd-Cu catalytic system has been successfully developed for synthesis of sulfonamides in one-pot manner from easily handle and readily available boronic acids, sulfur dioxide surrogate DABSO and O-benzoyl hydroxylamines in high yields. Without additional ligands, the newly developed catalytic system reveals a broad substrate scope for both partners and tolerates a wide array of functional groups even at low catalyst loadings. Furthermore, based on the control experiments, a plausible mechanism has been proposed, in which sodium sulfinate has been isolated and identified as the crucial intermediate for this straightforward bimetallic catalytic transformation...
January 12, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28078735/manganese-catalyzed-multicomponent-synthesis-of-pyrimidines-from-alcohols-and-amidines
#9
Nicklas Deibl, Rhett Kempe
The development of catalytic reactions for synthesizing different compounds from alcohols to save fossil carbon feedstock and reduce CO2 emissions is of high importance. Replacing rare noble metals with abundantly available 3d metals is equally important. We report a manganese-complex-catalyzed multicomponent synthesis of pyrimidines from amidines and up to three alcohols. Our reaction proceeds through condensation and dehydrogenation steps, permitting selective C-C and C-N bond formations. β-Alkylation reactions are used to multiply alkylate secondary alcohols with two different primary alcohols to synthesize fully substituted pyrimidines in a one-pot process...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28078632/fluorescent-carbon-dot-as-nanosensor-for-sensitive-and-selective-detection-of-cefixime-based-on-inner-filter-effect
#10
Farhad Akhgari, Naser Samadi, Khalil Farhadi
Here a simple and sensitive fluorescent assay for detecting Cefixime based on inner filter effect (IFE) has been proven, which is conceptually different from the previously reported CEF fluorescent assays. In this sensing platform, fluorescent carbon dots (CDs) were prepared by one-pot synthesis and was directly used as fluorophore in IFE. The method is based on the complexation reaction between cefixime and palladium ion in the presence of acidic buffer solution (pH 4). The Pd(II)-CEFcomplex was capable of functioning as a powerful absorber in IFE to influence the excitation of fluorophore (CDs)...
January 11, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28078550/iodine-mediated-formula-see-text-c-h-functionalization-of-methyl-ketones-a-one-pot-synthesis-of-functionalized-indolizines-via-the-1-3-dipolar-cycloaddition-reaction-between-pyridinium-ylides-and-ynones
#11
Issa Yavari, Jamil Sheykhahmadi, Maryam Naeimabadi, Mohammad Reza Halvagar
An efficient transition-metal-free approach toward C-H bond activation by using molecular [Formula: see text]-mediated [Formula: see text] C-H bond functionalization for the synthesis of indolizine derivatives via 1,3-dipolar cycloaddition reaction of nitrogen ylides with ynones is described.
January 11, 2017: Molecular Diversity
https://www.readbyqxmd.com/read/28077202/long-term-care-and-cultural-competence
#12
Jeannette Y Wick, Myroslava Sharabun
The United States has historically been a melting pot of cultures. Today the population has changed because many immigrants are now older than past immigrants, are frequently retired, and have chronic diseases that need careful management. Health care providers need to be culturally competent to deliver effective health care to these diverse populations. Over the years, health care systems and providers have become much more aware of the needs of minority populations. They accommodate language differences and individuals' ingrained beliefs that may affect health care and learn how to ask the questions that will elicit the information they need to treat patients...
January 1, 2017: Consultant Pharmacist: the Journal of the American Society of Consultant Pharmacists
https://www.readbyqxmd.com/read/28076767/-s-pot-on-mitochondria-cannabinoids-disrupt-cellular-respiration-to-limit-neuronal-activity
#13
Tibor Harkany, Tamas L Horvath
Classical views posit G protein-coupled cannabinoid receptor 1s (CB1Rs) at the cell surface with cytosolic Giα-mediated signal transduction. Hebert-Chatelain et al. (2016) instead place CB1Rs at mitochondria limiting neuronal respiration by soluble adenylyl cyclase-dependent modulation of complex I activity. Thus, neuronal bioenergetics link to synaptic plasticity and, globally, learning and memory.
January 10, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28075600/a-synthesis-of-dual-warhead-%C3%AE-aryl-ethenesulfonyl-fluorides-and-one-pot-reaction-to-%C3%AE-sultams
#14
Praveen K Chinthakindi, Kimberleigh B Govender, A Sanjeeva Kumar, Hendrik G Kruger, Thavendran Govender, Tricia Naicker, Per I Arvidsson
Herein, we report an operationally simple, ligand- and additive-free oxidative boron-Heck coupling that is compatible with the ethenesulfonyl fluoride functional group. The protocol proceeds at room temperature with chemoselectivity and E-isomer selectivity and offers facile access to a wide range of β-aryl/heteroaryl ethenesulfonyl fluorides from commercial boronic acids. Furthermore, we demonstrate a "one-pot click" reaction to directly transform the products to aryl-substituted β-sultams.
January 11, 2017: Organic Letters
https://www.readbyqxmd.com/read/28075015/leaf-emergence-phyllochron-index-and-leaf-expansion-response-to-soil-drying-in-cowpea-genotypes
#15
Anju Manandhar, Thomas R Sinclair, Thomas W Rufty, Michel E Ghanem
Drought can result in severely decreased leaf area development, which impacts plant growth and yield. However, rarely is leaf emergence or leaf expansion separated to resolve the relative sensitivity to water deficit of these two processes. Experiments were undertaken to impose drought over approximately 2 weeks for eight cowpea (Vigna unguiculata) genotypes grown in pots under controlled environmental conditions. Daily measures of phyllochron index (leaf emergence) and leaf area increase (leaf expansion) were obtained...
January 11, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28074912/influences-of-calcium-silicate-on-chemical-forms-and-subcellular-distribution-of-cadmium-in-amaranthus-hypochondriacus-l
#16
Huanping Lu, Zhian Li, Jingtao Wu, Yong Shen, Yingwen Li, Bi Zou, Yetao Tang, Ping Zhuang
A pot experiment was conducted to investigate the effects of calcium silicate (CS) on the subcellular distribution and chemical forms of cadmium (Cd) in grain amaranths (Amaranthus hypochondriacus L. Cv. 'K112') grown in a Cd contaminated soil. Results showed that the dry weight and the photosynthetic pigments contents in grain amaranths increased significantly with the increasing doses of CS treatments, with the highest value found for the treatment of CS3 (1.65 g/kg). Compared with the control, application of CS4 (3...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28073772/a-water-availability-gradient-reveals-the-deficit-level-required-to-affect-traits-in-potted-juvenile-eucalyptus-globulus
#17
Adam B McKiernan, Brad M Potts, Mark J Hovenden, Timothy J Brodribb, Noel W Davies, Thomas Rodemann, Scott A M McAdam, Julianne M O'Reilly-Wapstra
BACKGROUND AND AIMS: Drought leading to soil water deficit can have severe impacts on plants. Water deficit may lead to plant water stress and affect growth and chemical traits. Plant secondary metabolite (PSM) responses to water deficit vary between compounds and studies, with inconsistent reports of changes to PSM concentrations even within a single species. This disparity may result from experimental water deficit variation among studies, and so multiple water deficit treatments are used to fully assess PSM responses in a single species...
January 10, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28070580/a-one-pot-synthesis-of-1-2-3-triazolo-1-5-a-quinoxalines-from-1-azido-2-isocyanoarenes-with-high-bond-forming-efficiency
#18
Dengke Li, Tingting Mao, Jinbo Huang, Qiang Zhu
An efficient approach to prepare 1,2,3-triazolo[1,5-a]quinoxaline scaffolds, starting from 1-azido-2-isocyanoarenes and terminal acetylenes or substituted acetaldehydes, has been developed. In the case of trifluoromethylation triggered cyclization, four chemical bonds, including two C-C and two C-N bonds, were formed consecutively without isolating the triazole intermediate. In addition, these triazo-fused products were readily transformed into diversified quinoxaline derivatives via rhodium-catalyzed carbenoid insertion reactions...
January 10, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28070222/scale-up-and-process-integration-of-sugar-production-by-acidolysis-of-municipal-solid-waste-corn-stover-blends-in-ionic-liquids
#19
Chenlin Li, Ling Liang, Ning Sun, Vicki S Thompson, Feng Xu, Akash Narani, Qian He, Deepti Tanjore, Todd R Pray, Blake A Simmons, Seema Singh
BACKGROUND: Lignocellulosic biorefineries have tonnage and throughput requirements that must be met year round and there is no single feedstock available in any given region that is capable of meeting the price and availability demands of the biorefineries scheduled for deployment. Significant attention has been historically given to agriculturally derived feedstocks; however, a diverse range of wastes, including municipal solid wastes (MSW), also have the potential to serve as feedstocks for the production of advanced biofuels and have not been extensively studied...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28069502/synthesis-and-characterization-of-citrate-based-fluorescent-small-molecules-and-biodegradable-polymers
#20
Zhiwei Xie, Jimin P Kim, Qing Cai, Yi Zhang, Jinshan Guo, Ranjodh S Dhami, LiLi, Bin Kong, Yixue Su, Kevin A Schug, Jian Yang
Novel citric acid based photoluminescent dyes and degradable polymers are synthesized via a facile "one-pot" reaction. A comprehensive understanding of the fluorescence mechanisms of the resulting citric acid-based fluorophores is reported. Two distinct types of fluorophores are identified: a thiozolopyridine family with high quantum yield, long lifetime, and exceptional photostability, and a dioxopyridine family with relatively lower quantum yield, multiple lifetimes, and solvent-dependent band shifting behavior...
January 6, 2017: Acta Biomaterialia
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