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https://www.readbyqxmd.com/read/28343065/interaction-of-a-chelating-agent-5-hydroxy-2-hydroxymethyl-pyridin-4-1h-one-with-al-iii-cu-ii-and-zn-ii-ions
#1
Massimiliano Peana, Serenella Medici, Valeria Marina Nurchi, Joanna I Lachowicz, Guido Crisponi, Eugenio Garribba, Daniele Sanna, Maria Antonietta Zoroddu
5-Hydroxy-2-(hydroxymethyl)pyridin-4(1H)-one ligand, an iron chelator, was evaluated for its coordination ability toward Al(III), Cu(II) and Zn(II) ions by using potentiometric, NMR, EPR and UV-Vis techniques. The behavior of the ligand with the non-essential Al(III) ion has been examined, as well as its potential influence on the homeostatic equilibria of the essential Cu(II) and Zn(II) ions. Structural information on the complex formation equilibria have been obtained from 1D and 2D NMR study. The donor atoms involved in the coordination of Al(III), Cu(II) and Zn(II) ions are (O, O) the same as for Fe(III) at physiological pH value, even if from the complexation competition study the ligand appears to be more selective toward Fe(III) ions supporting that it can be used as an iron chelating agent...
March 16, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28343039/study-of-trace-metal-imbalances-in-the-blood-scalp-hair-and-nails-of-oral-cancer-patients-from-pakistan
#2
Muhammad Abdul Qayyum, Munir H Shah
Oral cancer is an important cause of cancer morbidity and mortality globally and exposure to trace metals alongside tobacco, alcohol and HPV are the important etiological factors in its development. Selected essential and toxic trace metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) were measured in the blood, scalp hair and nails of oral cancer patients and counterpart controls by atomic absorption spectrometry. Mean concentrations of Cd, Ni and Pb were found to be significantly higher (p<0.05) and those of Cu, Fe and Zn were considerably lower in the blood, scalp hair and nails of the patients than the controls...
March 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28340294/a-well-defined-osmium-cupin-complex-hyperstable-artificial-osmium-peroxygenase
#3
Nobutaka Fujieda, Takumi Nakano, Yuki Taniguchi, Haruna Ichihashi, Hideki Sugimoto, Yuma Morimoto, Yosuke Nishikawa, Genji Kurisu, Shinobu Itoh
Thermally stable TM1459 cupin superfamily protein from Thermotoga maritima was repurposed as an osmium (Os) peroxygenase by metal-substitution strategy employing the metal-binding promiscuity. This novel artificial metalloenzyme bears a datively bound Os ion supported by the 4-histidine motif. The well-defined Os center is responsible for not only the catalytic activity but also the thermodynamic stability of the protein folding, leading to the robust biocatalyst (Tm ≈ 120 °C). The spectroscopic analysis and atomic resolution X-ray crystal structures of Os-bound TM1459 revealed two types of donor sets to Os center with octahedral coordination geometry...
March 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28339205/ultrafast-non-f%C3%A3-rster-intramolecular-donor-acceptor-excitation-energy-transfer
#4
Stavros Athanasopoulos, Laura Alfonso Hernández, David Beljonne, Sebastian Fernandez-Alberti, Sergei Tretiak
Ultrafast intramolecular electronic energy transfer in a conjugated donor-acceptor system is simulated using non-adiabatic excited-state molecular dynamics. After initial site selective photoexcitation of the donor, transition density localization is monitored throughout the S2→S1 internal conversion process revealing an efficient unidirectional donor→acceptor energy transfer process. Detailed analysis of the excited state trajectories uncovers several salient features of the energy transfer dynamics. While a weak temperature dependence is observed during the entire electronic energy relaxation, an ultrafast initially temperature independent process allows the molecular system to approach the S2-S1 potential energy crossing seam within the first ten femtoseconds...
March 24, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28338012/prevalence-of-st1193-clone-and-inci1-st16-plasmid-in-e-coli-isolates-carrying-blactx-m-55-gene-from-urinary-tract-infections-patients-in-china
#5
Liang Xia, Yang Liu, Shu Xia, Timothy Kudinha, Shu-Nian Xiao, Nan-Shan Zhong, Guo-Sheng Ren, Chao Zhuo
To study molecular epidemiology of CTX-M-55-carrying Escherichia coli isolates from urinary tract infections (UTIs) in China. 111 blaCTX-M-55-positive E.coli isolates from UTIs patients in China were studied. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) were used to analyze the homologies among the strains. Conjugation experiments, S1nuclease PFGE and PCR analysis were performed to characterize plasmids harboring blaCTX-M-55 and their genetic environment. 111 isolates were clustered into 86 individual pulsotypes and three clusters by PFGE...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337793/solvent-regulated-self-assembly-of-achiral-donor-acceptor-complex-in-confined-chiral-nanotubes-chirality-transfer-inversion-and-amplification
#6
Yuangang Li, Pengfei Duan, Minghua Liu
A chiral gelator was designed and found to form chiral nanotwist and nanotube in toluene and DMSO, respectively, which could serve as host chiral matrixes for fabricating functional soft materials. Guest achiral π-conjugated donor and acceptor were doped in the gel and a solvent regulated self-assembly was observed. Although both the DMSO and toluene gels containing three components look similar as the transparent gels, it was clarified microscopically that while achiral dopants self-assembled in the confined nanotubes in DMSO gel, they only dissolve in the liquid phase in toluene gel...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28336253/mitochondrial-matters-mitochondrial-bottlenecks-self-assembling-structures-and-entrapment-in-the-female-germline
#7
Florence L Marlow
Mitochondrial replacement therapy, a procedure to generate embryos with the nuclear genome of a donor mother and the healthy mitochondria of a recipient egg, has recently emerged as a promising strategy to prevent transmission of devastating mitochondrial DNA diseases and infertility. The procedure may produce an embryo that is free of diseased mitochondria. A recent study addresses important fundamental questions about the mechanisms underlying maternal inheritance and translational questions regarding the transgenerational effectiveness of this promising therapeutic strategy...
March 15, 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28335669/the-experience-of-modified-sequential-selective-laser-photocoagulation-of-communicating-vessels-technique-for-twin-twin-transfusion-syndrome
#8
Susumu Murata, Mayumi Takano, Yukiko Kagawa, Masahiro Sumie, Masahiko Nakata
OBJECTIVE: Fetoscopic laser photocoagulation of vascular anastomoses is the essential choice in twin-twin transfusion syndrome (TTTS). We proposed that the modified sequential selective laser photocoagulation of communicating vessels (modified SQLPCV) to clarify the perinatal outcomes in TTTS. METHODS: The modified SQLPCV was designed with the following order: 1, artery-to-artery anastomoses; 2, venous-to-venous anastomoses; 3, artery-to-venous anastomoses from donor to recipient; and 4, artery-to-venous anastomoses from recipient to donor...
March 23, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28333245/euploidy-rates-in-donor-egg-cycles-significantly-differ-between-fertility-centers
#9
S Munné, M Alikani, L Ribustello, P Colls, Pedro A Martínez-Ortiz, D H McCulloh
STUDY QUESTION: Do external factors affect euploidy in egg donor cycles? SUMMARY ANSWER: The study demonstrates that during human assisted reproduction, embryonic chromosome abnormalities may be partly iatrogenic. WHAT IS KNOWN ALREADY: Chromosome abnormalities have been linked in the past to culture conditions such as temperature and Ph variations, as well as hormonal stimulation. Those reports were performed with older screening techniques (FISH), or ART methods no longer in use, and the subjects studied were not a homogeneous group...
March 2, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28333210/levels-of-trophectoderm-mitochondrial-dna-do-not-predict-the-reproductive-potential-of-sibling-embryos
#10
Nathan R Treff, Yiping Zhan, Xin Tao, Meir Olcha, Michael Han, Jessica Rajchel, Liza Morrison, Scott J Morin, Richard T Scott
STUDY QUESTION: What is the predictive value of trophectoderm mitochondrial DNA (mtDNA) quantity for blastocyst reproductive potential? SUMMARY ANSWER: This study demonstrates that, within a given cohort, mtDNA quantitation does not distinguish between embryos that implant and embryos that do not implant after double embryo transfer (DET). WHAT IS ALREADY KNOWN: An association between implantation failure and increased quantities of mtDNA has been observed in two studies but not in a third...
February 23, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28332627/cross-neutralizing-anti-hiv-1-human-single-chain-variable-fragments-scfvs-against-cd4-binding-site-and-n332-glycan-identified-from-a-recombinant-phage-library
#11
Lubina Khan, Rajesh Kumar, Ramachandran Thiruvengadam, Hilal Ahmad Parray, Muzamil Ashraf Makhdoomi, Sanjeev Kumar, Heena Aggarwal, Madhav Mohata, Abdul Wahid Hussain, Raksha Das, Raghavan Varadarajan, Jayanta Bhattacharya, Madhu Vajpayee, K G Murugavel, Suniti Solomon, Subrata Sinha, Kalpana Luthra
More than 50% of HIV-1 infection globally is caused by subtype_C viruses. Majority of the broadly neutralizing antibodies (bnAbs) targeting HIV-1 have been isolated from non-subtype_C infected donors. Mapping the epitope specificities of bnAbs provides useful information for vaccine design. Recombinant antibody technology enables generation of a large repertoire of monoclonals with diverse specificities. We constructed a phage recombinant single chain variable fragment (scFv) library with a diversity of 7.8 × 10(8) clones, using a novel strategy of pooling peripheral blood mononuclear cells (PBMCs) of six select HIV-1 chronically infected Indian donors whose plasma antibodies exhibited potent cross neutralization efficiency...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332214/serum-eye-drops-a-survey-of-international-production-methods
#12
D C Marks, P F van der Meer
BACKGROUND: Serum eye drops (SEDs) are used to treat dry eye syndrome and non-healing corneal lesions when other treatments fail. Despite many clinical studies demonstrating the efficacy of both autologous and allogeneic SEDs, there is no internationally harmonized method for producing SEDs. MATERIALS AND METHODS: A 40-question survey requesting information regarding donor selection, blood collection and processing, infectious disease screening, shelf life and regulatory requirements for the production of autologous and allogeneic SEDs was developed by the Biomedical Excellence for Safer Transfusion Collaborative...
March 23, 2017: Vox Sanguinis
https://www.readbyqxmd.com/read/28331856/the-immunogenicity-of-hla-class-ii-mismatches-the-predicted-presentation-of-nonself-allo-hla-derived-peptide-by-the-hla-dr-phenotype-of-the-recipient-is-associated-with-the-formation-of-dsa
#13
Vadim Jucaud
The identification of permissible HLA class II mismatches can prevent DSA in mismatched transplantation. The HLA-DR phenotype of recipients contributes to DSA formation by presenting allo-HLA-derived peptides to T-helper cells, which induces the differentiation of B cells into plasma cells. Comparing the binding affinity of self and nonself allo-HLA-derived peptides for recipients' HLA class II antigens may distinguish immunogenic HLA mismatches from nonimmunogenic ones. The binding affinities of allo-HLA-derived peptides to recipients' HLA-DR and HLA-DQ antigens were predicted using the NetMHCIIpan 3...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28330290/successful-cloning-of-an-adult-breeding-boar-from-the-novel-chinese-guike-no-1-swine-specialized-strain
#14
Jun-Yu Nie, Xiang-Xing Zhu, Bing-Kun Xie, Su-Qun Nong, Qing-Yan Ma, Hui-Yan Xu, Xiao-Gan Yang, Yang-Qing Lu, Ke-Huan Lu, Yu-Ying Liao, Sheng-Sheng Lu
Somatic cloning, also known as somatic cell nuclear transfer (SCNT), is a promising technology which has been expected to rapidly extend the population of elaborately selected breeding boars with superior production performance. Chinese Guike No. 1 pig breed is a novel swine specialized strain incorporated with the pedigree background of Duroc and Chinese Luchuan pig breeds, thus inherits an excellent production performance. The present study was conducted to establish somatic cloning procedures of adult breeding boars from the Chinese Guike No...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329944/-evolutionary-characteristics-and-positive-selection-site-of-hepatitis-c-virus-isolated-in-intravenous-drug-users-in-pudong-new-district-shanghai
#15
Y Wang, H Y Wu, X C Zhao, W P Zhu, Q Wan, Y H Lu, Q W Jiang
Objective: To understand the genotypes of hepatitis C virus (HCV) circulating in intravenous drug users (IDUs) in Pudong new district, Shanghai, and explore the population growth and selection pressure of the HCV strains isolated. Methods: A total of 200 serum specimens sampled from IDUs in local methadone maintenance treatment clinic in Pudong were used for amplification of a HCV NS5B 377-nt partial sequence. Mean evolutionary rate and effective number of infections were estimated based on the 377-nt partial sequences of the HCV strains isolated from IDUs and isolated contemporarily from local voluntary blood donors, men who have sex with men and reported hepatitis C cases by using BEAST software...
March 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28329396/heart-transplantation-in-selected-patients-aged-60-years-and-older-a-two-decade-retrospective-and-multicentre-analysis
#16
Christian Bosseau, Bernard Lelong, Sabine Pattier, Jean-Noël Trochu, Jean-Christian Roussel, Agnès Sirinelli, Michel Aupart, Céline Chabanne, Richard Dorent, Christelle Cantrelle, Philippe Mabo, Christophe Leclercq, Jean-Philippe Verhoye, Erwan Flécher
OBJECTIVES: This study analysed survival and long-term outcomes of heart transplantation in patients aged 60 years and older. We also analysed the impact of a national graft allocation priority [Super Emergency (SE)] and compared survival with younger patients in our centres and in France. METHODS: We performed a multicentre (University Hospitals in Nantes, Rennes and Tours), 2-decade retrospective study between 1 January 1994 and 31 December 2013. Elderly recipients were placed on the same list as younger patients; the use of marginal donors remained occasional...
March 7, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28327460/comprehensive-proteomic-characterization-of-stem-cell-derived-extracellular-matrices
#17
Héloïse Ragelle, Alexandra Naba, Benjamin L Larson, Fangheng Zhou, Miralem Prijić, Charles A Whittaker, Amanda Del Rosario, Robert Langer, Richard O Hynes, Daniel G Anderson
In the stem-cell niche, the extracellular matrix (ECM) serves as a structural support that additionally provides stem cells with signals that contribute to the regulation of stem-cell function, via reciprocal interactions between cells and components of the ECM. Recently, cell-derived ECMs have emerged as in vitro cell culture substrates to better recapitulate the native stem-cell microenvironment outside the body. Significant changes in cell number, morphology and function have been observed when mesenchymal stem cells (MSC) were cultured on ECM substrates as compared to standard tissue-culture polystyrene (TCPS)...
March 7, 2017: Biomaterials
https://www.readbyqxmd.com/read/28327456/relationship-between-plasma-anti-m%C3%A3-llerian-hormone-concentrations-during-the-rearing-period-and-subsequent-embryo-productivity-in-japanese-black-cattle
#18
H Nabenishi, G Kitahara, S Takagi, A Yamazaki, T Osawa
To use plasma anti-Müllerian hormone (AMH) concentrations as early-stage markers for donor cow selection, we investigated the relationship between plasma AMH concentrations in Japanese black heifers and subsequent embryo productivity following superovulation treatment. Plasma AMH and nonesterified fatty acid (NEFA) concentrations in 6 heifers were evaluated once per month from 3 mo before successful AI for primiparity to 3 mo postpartum. Following calving, embryo collection by superovulation treatment was performed at 3- to 4-mo intervals...
February 4, 2017: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/28326096/tagw2-a-good-reflection-of-wheat-polyploidization-and-evolution
#19
Lin Qin, Junjie Zhao, Tian Li, Jian Hou, Xueyong Zhang, Chenyang Hao
Hexaploid wheat consists of three subgenomes, namely, A, B, and D. These well-characterized ancestral genomes also exist at the diploid and tetraploid levels, thereby rendering wheat as a good model species for studying polyploidization. Here, we performed intra- and inter-species comparative analyses of wheat and its relatives to dissect polymorphism and differentiation of the TaGW2 genes. Our results showed that genetic diversity of TaGW2 decreased with progression from the diploids to tetraploids and hexaploids...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28324211/comparison-of-in-vitro-osteogenic-potential-of-iliac-crest-and-degenerative-facet-joint-bone-autografts-for-intervertebral-fusion-in-lumbar-spinal-stenosis
#20
Jeroen Geurts, Daniela Ramp, Stefan Schären, Cordula Netzer
PURPOSE: The promotion of spinal fusion using bone autografts is largely mediated by the osteoinductive potential of progenitors/mesenchymal stem cells (MSC) that reside in the marrow spaces of cancellous bone. Iliac crest is the common autograft donor site, but its use presents an increased risk for donor site pain, morbidity and infection. Degenerative bone samples harvested during facetectomy might provide an alternative viable source of osteoinductive autografts. In this study, we conducted an intra-individual comparison of the osteogenic potential of isolated low passage MSC from both sources...
March 21, 2017: European Spine Journal
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