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https://www.readbyqxmd.com/read/28550713/state-of-the-art-on-oocyte-cryopreservation-in-female-cancer-patients-a-critical-review-of-the-literature
#1
REVIEW
Claudia Massarotti, Paola Scaruffi, Matteo Lambertini, Valentino Remorgida, Lucia Del Mastro, Paola Anserini
During the last decades, important advances in therapeutic options have led to increased survival rates in cancer patients; however, cancer treatments are associated with several potential adverse effects including infertility in those diagnosed during their reproductive years. A proper discussion about fertility preservation options before the use of therapies with potential gonadotoxicity (i.e. oncofertility counseling) is standard of care and should be offered to all patients of childbearing age. Temporary ovarian suppression with LH-RH analogs, oocyte and embryo cryopreservation are standard strategies for fertility preservation in female cancer patients...
May 9, 2017: Cancer Treatment Reviews
https://www.readbyqxmd.com/read/28548669/rhodium-catalyzed-c2-and-c4-c-h-activation-annulation-of-3-1h-indol-3-yl-3-oxopropanenitriles-with-internal-alkynes-a-facile-access-to-substituted-and-fused-carbazoles
#2
Tao Zhou, Bin Li, Baiquan Wang
Rhodium-catalyzed oxidative annulation reactions of 3-(1H-indol-3-yl)-3-oxopropanenitriles with internal alkynes have been developed. A series of substituted carbazoles and 4H-oxepino[2,3,4,5-def]carbazoles, through a formal Rh(iii)-catalyzed (4+2) cycloaddition with an alkyne and tandem (4+2) and (5+2) cycloaddition with two molecules of alkynes, were obtained. The reactions involved sequential cleavage of C(sp(2))-H/C(sp(3))-H bonds and annulation with an alkyne in the first step, and sequential cleavage of C(sp(2))-H/O-H bonds and annulation with another alkyne in the second step...
May 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28548280/air-core-detectors-for-cerenkov-free-scintillation-dosimetry-of-brachytherapy-%C3%AE-sources
#3
Marion Eichmann, Benedikt Thomann
PURPOSE: Plastic scintillation detectors are used for dosimetry in small radiation fields with high dose gradients, green e.g. provided by β-emitting sources like (106) Ru/(106) Rh eye plaques. A drawback is a background signal caused by Cerenkov radiation generated by electrons passing the optical fibers (light guides) of this dosimetry system. Common approaches to correct for the Cerenkov signal are influenced by uncertainties resulting from detector positioning and calibration procedures...
May 26, 2017: Medical Physics
https://www.readbyqxmd.com/read/28548178/stereospecific-control-of-the-metal-centred-chirality-of-rhodium-iii-and-iridium-iii-complexes-bearing-tetradentate-cnn-p-ligands
#4
María Carmona, Ricardo Rodríguez, Isabel Méndez, Vincenzo Passarelli, Fernando J Lahoz, Pilar García-Orduña, Daniel Carmona
Ligands LH1-LH3 have been prepared by two successive condensation/reduction steps. These ligands react with MCl3 (M = Rh, Ir) rendering the trichlorido complexes [MCl3(κ(3)N,N',P-LH)] (M = Rh, LH = LH1 (1), LH2 (2), LH3 (3); M = Ir, LH = LH1, (4)) as racemic mixtures of fac and mer isomers. Only one of the two possible fac isomers was detected. The mer isomer of the rhodium compounds 1-3 quantitatively isomerizes to the more stable fac isomer, whereas the mer isomer of the iridium complex 4 does not. DFT calculations indicate a dissociative pathway for this isomerization...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28548158/visible-light-assisted-hydrogen-generation-from-complete-decomposition-of-hydrous-hydrazine-using-rhodium-modified-tio2-photocatalysts
#5
Pawan Kumar, Anurag Kumar, Clémence Queffélec, Dietrich Gudat, Qi Wang, Suman L Jain, Rabah Boukherroub, Sabine Szunerits
Hydrogen is considered to be an ideal energy carrier, which produces only water when combined with oxygen and thus has no detrimental effect on the environment. While the catalytic decomposition of hydrous hydrazine for the production of hydrogen is well explored, little is known about its photocatalytic decomposition. The present paper describes a highly efficient photochemical methodology for the production of hydrogen through the decomposition of aqueous hydrazine using titanium dioxide nanoparticles modified with a Rh(i) coordinated catechol phosphane ligand (TiO2-Rh) as a photocatalyst under visible light irradiation...
May 26, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28546909/porous-ionic-membrane-based-flexible-humidity-sensor-and-its-multifunctional-applications
#6
Tie Li, Lianhui Li, Hongwei Sun, Yan Xu, Xuewen Wang, Hui Luo, Zheng Liu, Ting Zhang
A highly flexible porous ionic membrane (PIM) is fabricated from a polyvinyl alcohol/KOH polymer gel electrolyte, showing well-defined 3D porous structure. The conductance of the PIM changes more than 70 times as the relative humidity (RH) increases from 10.89% to 81.75% with fast and reversible response at room temperature. In addition, the PIM-based sensor is insensitive to temperature (0-95 °C) and pressure (0-6.8 kPa) change, which indicates that it can be used as highly selective flexible humidity sensor...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28546898/treatment-of-fly-ash-from-power-plants-using-thermal-plasma
#7
Sulaiman Al-Mayman, Ibrahim AlShunaifi, Abdullah Albeladi, Imed Ghiloufi, Saud Binjuwair
Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, inductively coupled plasma atomic emission spectroscopy and scanning electron microscopy. With these technics, the composition, the chemical and physical proprieties of fly ash are determined. The results obtained by these analysis show that fly ash is mainly composed of carbon, and it contains also sulfur and metals such as V, Ca, Mg, Na, Fe, Ni, and Rh...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546895/cvd-transfer-free-graphene-for-sensing-applications
#8
Chiara Schiattarella, Sten Vollebregt, Tiziana Polichetti, Brigida Alfano, Ettore Massera, Maria Lucia Miglietta, Girolamo Di Francia, Pasqualina Maria Sarro
The sp(2) carbon-based allotropes have been extensively exploited for the realization of gas sensors in the recent years because of their high conductivity and large specific surface area. A study on graphene that was synthetized by means of a novel transfer-free fabrication approach and is employed as sensing material is herein presented. Multilayer graphene was deposited by chemical vapour deposition (CVD) mediated by CMOS-compatible Mo. The utilized technique takes advantage of the absence of damage or contamination of the synthesized graphene, because there is no need for the transfer onto a substrate...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546800/hyperprolactinaemia-a-problem-in-patients-from-the-reproductive-period-to-the-menopause
#9
Sylwia Pałubska, Aneta Adamiak-Godlewska, Izabela Winkler, Katarzyna Romanek-Piva, Tomasz Rechberger, Marek Gogacz
Hyperprolactinaemia especially affects women in reproductive age (90/100,000) but also often is diagnosed in menopause age and leads to disturbances in functioning of LH-RH neurons and, as a consequence, to a decrease of FSH and LH, which causes inhibition of oestradiol production. Prolactin is a peptide hormone, phylogenetically one of the oldest, stimulating cells of various organs, which is produced and secreted mainly by lactotrophic acidophilic cells of the anterior lobe of the pituitary. It influences the increase in the mass of the mammary glands, and stimulation and maintenance of lactation after delivery...
March 2017: Przeglad Menopauzalny, Menopause Review
https://www.readbyqxmd.com/read/28544897/size-resolved-aerosol-water-soluble-ions-during-the-summer-and-winter-seasons-in-beijing-formation-mechanisms-of-secondary-inorganic-aerosols
#10
Zirui Liu, Yuzhu Xie, Bo Hu, Tianxue Wen, Jinyuan Xin, Xingru Li, Yuesi Wang
Size-segregated water-soluble ionic species (WSIs) were measured using an Anderson cascade impactor from Jul. to Aug. 2008 and from Dec. 2009 to Feb. 2010 in urban Beijing. The results showed that fine particles (PM2.1, Dp < 2.1 μm) accounted for ∼49% (summer) and ∼34% (winter) of the total particulate mass, and WSIs accounted for 23-82% of the mass concentration of PM2.1. Secondary inorganic aerosols (SIAs, the sum of SO4(2-), NO3(-) and NH4(+)) accounted for more than 30% of the fine particles, which were greatly elevated during particle pollution events (PM events), thereby leading to an alteration of the size distributions of SO4(2-) and NO3(-) to nearly single fine-mode distributions peaking at 0...
May 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28544237/rhodium-catalyzed-enantioselective-radical-addition-of-cx4-reagents-to-olefins
#11
Joseph M Ready, Bo Chen, Cheng Fang, Peng Liu
We describe an enantioselective addition of Br-CX3 (X = Cl or Br) to terminal olefins that introduces a trihalomethyl group and generates optically active secondary bromides. Computational and experimental evidence supports an asymmetric atom transfer radical addition (ATRA) mechanism in which the stereodetermining step involves outer-sphere bromine abstraction from a (bisphosphine)Rh(II)BrCl complex by a benzylic radical intermediate. Beyond the synthetic utility, this mechanism appears unprecedented in asymmetric catalysis...
May 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544013/-epigallocatechin-3-gallate-inhibits-human-angiotensin-converting-enzyme-activity-through-an-autoxidation-dependent-mechanism
#12
Zhe Liu, Sayaka Nakashima, Toshiyuki Nakamura, Shintaro Munemasa, Yoshiyuki Murata, Yoshimasa Nakamura
We investigated the molecular mechanisms involved in the angiotensin-converting enzyme (ACE) inhibition by (-)-epigallocatechin-3-gallate (EGCg), a major tea catechin. EGCg inhibited both the ACE activity in the lysate of human colorectal cancer cells and human recombinant ACE (rh-ACE) in a dose-dependent manner. Co-incubation with zinc sulfate showed no influence on the rh-ACE inhibition by EGCg, whereas it completely counteracted the inhibitory effect of ethylenediaminetetraacetic acid, a chelating-type ACE inhibitor...
May 23, 2017: Journal of Biochemical and Molecular Toxicology
https://www.readbyqxmd.com/read/28543991/sensitivity-and-specificity-of-plasma-alt-alp-and-bile-acids-for-hepatitis-in-labrador-retrievers
#13
K Dirksen, I A Burgener, J Rothuizen, T S G A M van den Ingh, L C Penning, B Spee, H Fieten
BACKGROUND: Biochemical indicators for diagnosing liver disease are plasma alanine aminotransferase activity (ALT), alkaline phosphatase activity (ALP), and bile acid concentration (BA). OBJECTIVES: To determine the sensitivity and specificity of ALT, ALP, and BA for detecting primary hepatitis (PH) in clinically healthy Labrador retrievers and investigate whether ALT and ALP can discriminate between dogs with PH and nonspecific reactive hepatitis (RH). ANIMALS: 191 clinically healthy and 51 clinically ill Labrador retrievers with hepatic histopathology...
May 23, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28541705/synthesis-of-6-substituted-piperidin-3-ones-via-rh-ii-catalyzed-transannulation-of-n-sulfonyl-1-2-3-triazoles-with-electron-rich-aromatic-nucleophiles
#14
Yang Li, Ran Zhang, Arshad Ali, Jing Zhang, Xihe Bi, Junkai Fu
A highly diastereoselective rhodium(II)-catalyzed transannulation of aldehyde-tethered N-sulfonyl triazoles with electron-rich aromatic nucleophiles is reported for the first time to afford functionalized 6-substituted piperidin-3-ones. The reaction has a broad substrate scope including both aliphatic and aromatic N-sulfonyl-1,2,3-triazoles together with various aromatic nucleophiles. The addition of a catalytic amount of Lewis acid has proven to be crucial for the yield improvement. By employing this methodology, hardly accessible piperidin-3-ones bearing quaternary carbons could be obtained...
May 25, 2017: Organic Letters
https://www.readbyqxmd.com/read/28541363/rh-iii-catalyzed-bilateral-cyclization-of-aldehydes-with-nitrosos-toward-unsymmetrical-acridines-proceeding-with-c-h-functionalization-enabled-by-a-transient-directing-group
#15
Weiming Hu, Qingheng Zheng, Song Sun, Jiang Cheng
A Rh(iii)-catalyzed bilateral cyclization was developed for the efficient construction of acridines proceeding with C-H functionalization whereby in situ formation and removal of an imino transient directing group in the presence of catalytic amount of BnNH2 are achieved. In this transformation, a sequential Rh(iii)-catalyzed C-H amination, cyclization, and aromatization process was involved.
May 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28540938/a-deciduous-directing-group-approach-for-the-addition-of-aryl-and-vinyl-nucleophiles-to-maleimides
#16
Kiran R Bettadapur, Veeranjaneyulu Lanke, Kandikere Ramaiah Prabhu
A Rh(iii)-catalyzed C-H activation followed by conjugate addition to maleimides, using carboxylic acid as a traceless/deciduous directing group, to formally furnish a Csp(2)-Csp(3) bond is presented. For the first time, derivatives of acrylic acid have been shown as surrogates for the unstable and expensive alkenyl boronic acids.
May 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28540500/effect-of-relative-humidity-on-bipolar-electrostatic-charge-profiles-of-dry-powder-aerosols
#17
Jiaqi Yu, Jennifer Wong, Ari Ukkonen, Jonna Kannosto, Hak-Kim Chan
PURPOSE: This work investigated the effect of relative humidity (RH) on bipolar electrostatic charge profiles of dry powder inhaler aerosols using the Bipolar Charge Analyzer (BOLAR). METHODS: Two commercial products, Pulmicort® (400 μg, budesonide) and Bricanyl® (500 μg, terbutaline sulfate) Turbuhaler®, were used as model dry powder inhalers (DPIs) in this study. Three individual doses from each Turbuhaler® were sampled at 15, 40, 65 and 90% RH. Subsequently, charge and mass profiles were determined for each dispersion...
May 24, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28539043/achieving-remarkable-activity-and-durability-towards-oxygen-reduction-reaction-based-on-ultrathin-rh-doped-pt-nanowires
#18
Hongwen Huang, Kan Li, Zhao Chen, Laihao Luo, Yuqian Gu, Dongyan Zhang, Chao Ma, Rui Si, Jinlong Yang, Zhenmeng Peng, Jie Zeng
The research of active and sustainable electrocatalysts towards oxygen reduction reaction (ORR) is of great importance for industrial application of fuel cells. Here, we report a remarkable ORR catalyst with both excellent mass activity and durability based on sub-2-nm thick Rh-doped Pt nanowires, which combines the merits of high utilization efficiency of Pt atoms, anisotropic one-dimensional nanostructure, and doping of Rh atoms. Compared with commercial Pt/C catalyst, the Rh-doped Pt nanowires/C catalyst shows a 7...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28537621/competition-between-stability-of-icosahedral-and-cuboctahedral-morphologies-in-bimetallic-nanoalloys
#19
Hamed Akbarzadeh, Mohsen Abbaspour, Esmat Mehrjouei
In this study, we investigated the heating process for pure (Rh55 and Cu55), single dopant (Rh1Cu54 and Rh54Cu), core@shell (Rh13@Cu42 and Cu13@Rh42), and alloy (Rh13Cu42, Rh42Cu13) nanoclusters in two structures (cuboctahedral and icosahedral) from 0 to 2000 K using molecular dynamics (MD) simulations. Our aim was to investigate the effects of composition and chemical arrangement on the kinetic and thermodynamic stability of Rh-Cu bimetallic nanoalloys. Our results indicated that Cu55, Ir55, Rh1Cu54, Rh54Cu, and Cu13@Rh42 in the cuboctahedral and icosahedral structures and Rh42Cu13 in the icosahedral structure did not experience any transformation with the exception of melting...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537406/total-synthesis-of-pancratistatin-by-the-rh-iii-catalyzed-addition-of-a-densely-functionalized-benzamide-to-a-sugar-derived-nitroalkene
#20
Tyler J Potter, Jonathan A Ellman
Herein, we report the concise total synthesis of (+)-pancratistatin, accessed in a 10-step linear sequence from commercially available inputs. The convergent synthesis features a highly diastereoselective Rh(III)-catalyzed C-H bond addition to a d-glucose-derived nitroalkene and a late-stage intramolecular transamidation to furnish the B ring lactam.
May 24, 2017: Organic Letters
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