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https://www.readbyqxmd.com/read/28545872/imaging-of-liver-transplantation
#1
Rossano Girometti, Martina Pancot, Giuseppe Como, Chiara Zuiani
Liver transplantation (LT) is the treatment of choice for end-stage chronic liver disease, fulminant liver failure and early stage hepatocellular carcinoma. As discussed in this review, state-of-the-art imaging modalities including ultrasonography (US), computed tomography (CT) and magnetic resonance imaging (MRI) play a pivotal role in the selection of patients and donors, as well as in early detection of those complications at risk of impairing graft function and/or survival. We also illustrate main imaging findings related to the wide spectrum of clinical problems raised by LT...
May 15, 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28544673/biocatalytic-friedel-crafts-acylation-and-fries-reaction
#2
Nina G Schmidt, Tea Pavkov-Keller, Nina Richter, Birgit Wiltschi, Karl Gruber, Wolfgang Kroutil
The Friedel-Crafts acylation is commonly used for the synthesis of aryl ketones, and a biocatalytic version, which may benefit from the chemo- and regioselectivity of enzymes, has not yet been introduced. Described here is a bacterial acyltransferase which can catalyze Friedel-Crafts C-acylation of phenolic substrates in buffer without the need of CoA-activated reagents. Conversions reach up to >99 %, and various C- or O-acyl donors, such as DAPG or isopropenyl acetate, are accepted by this enzyme. Furthermore the enzyme enables a Fries-like rearrangement reaction of resorcinol derivatives...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544612/ecology-adaptation-and-function-of-methane-sulfidic-spring-water-biofilm-microorganisms-including-a-strain-of-anaerobic-fungus-mucor-hiemalis
#3
Enamul Hoque, Johannes Fritscher
Ecological aspects, adaptation, and some functions of a special biofilm and its unique key anaerobic fungus Mucor hiemalis strain EH11 isolated from a pristine spring (Künzing, Bavaria, Germany) are described. The spring's pure nature is characterized by, for example, bubbling methane, marine-salinity, mild hydrothermal (~19.1°C), sulfidic, and reductive-anoxic (Eh : -241 to -253 mV, O2 : ≤ 0.1 mg/L) conditions. It is geoecologically located at the border zone between Bavarian Forest (crystalline rocky mountains) and the moor-like Danube River valley, where geological displacements bring the spring's water from the deeper layers of former marine sources up to the surface...
May 24, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28544517/fetoscopic-laser-photocoagulation-for-amniotic-fluid-discordance-bordering-on-twin-twin-transfusion-syndrome-feasibility-perinatal-and-long-term-outcomes
#4
Katsusuke Ozawa, Rika Sugibayashi, Seiji Wada, Masahiro Sumie, Keisuke Ishii, Masahiko Nakata, Takeshi Murakoshi, Yushi Ito, Haruhiko Sago
AIM: This study investigated the feasibility and safety of fetoscopic laser photocoagulation (FLP) for amniotic fluid discordance (AFD) bordering on twin-twin transfusion syndrome (TTTS) with an absent or reverse end-diastolic velocity (AREDV) in the umbilical artery (UA), and evaluated the perinatal and long-term outcomes. METHODS: A prospective intervention study was performed between 20 + 0 and 25 + 6 weeks of gestation (UMIN000004165). AFD bordering on TTTS was defined as maximum vertical pocket (MVP) of amniotic fluid in one twin's sac ≤3 cm and amniotic fluid MVP in the other twin's sac ≥7 cm excluding TTTS...
May 19, 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/28544420/gold-i-hydrides-as-proton-acceptors-in-dihydrogen-bond-formation
#5
Ignacy Cukrowski, Jurgens Hendrik de Lange, Ferdinand Groenewald, Helgard G Raubenheimer
Wavefunction and DFT calculations indicate that anionic dihydride complexes of AuI form strong to moderate directed Au-H···H bonds with one or two HF, H₂O and NH₃ prototype proton donor molecules. The largely electrostatic interaction is influenced by relativistic effects which, however, do not increase the binding energy. Very weak Au···H associations - exhibiting a corresponding bond path - occur between neutral AuH and HF units, although ultimately F becomes the preferred donor atom in the most stable structure...
May 25, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28543381/ileocecal-vascularized-lymph-node-transfer-for-the-treatment-of-extremity-lymphedema-a-case-report
#6
Pedro Ciudad, Oscar J Manrique, Mouchammed Agko, En-Wei Liu, Wei-Ling Chang, Matthew Sze-Wei Yeo, Tony Chieh-Ting Huang, Ram M Chilgar, Hung-Chi Chen
Vascularized lymph node (VLN) transfer has been of high interest in the past decade for the treatment of lymphedema, since it has been shown to be effective in reducing limb volumes, decreasing infectious episodes and improving quality of life. Multiple donor sites have been described in the quest for the optimal one. Herein, we describe a novel lymph node flap option based on the ileocolic artery and vein. The ileocecal vascularized lymph node (IC-VLN) flap was used in the management of a 33-year-old male patient with lower extremity lymphedema secondary to left inguinal trauma...
May 24, 2017: Microsurgery
https://www.readbyqxmd.com/read/28542611/no-molecular-or-serological-evidence-of-zikavirus-infection-among-healthy-blood-donors-living-in-or-travelling-to-regions-where-aedes-albopictus-circulates
#7
Wegene Borena, Tamara Hofer, Karin Stiasny, Stephan W Aberle, Manfred Gaber, Dorothee von Laer, Harald Schennach
BACKGROUND: Previous studies have shown that Zika virus can infect and be transmitted by A. albopictus. The World Health organization (WHO) has raised concerns of autochthonous transmission of the virus in regions where the vector is endemic. The aim of this pilot study was to assess the occurrence of Zika virus (ZIKV) in western Austria (Tyrol) especially after a history of travel to A. albopictus endemic regions. METHODS: The study participants were healthy blood donors at randomly selected donation sites in the west Austrian region Tyrol...
2017: PloS One
https://www.readbyqxmd.com/read/28542329/novel-agoshrna-molecules-for-silencing-of-the-ccr5-co-receptor-for-hiv-1-infection
#8
Elena Herrera-Carrillo, Ben Berkhout
Allogeneic transplantation of blood stem cells from a CCR5-Δ32 homozygous donor to an HIV-infected individual, the "Berlin patient", led to a cure. Since then there has been a search for approaches that mimic this intervention in a gene therapy setting. RNA interference (RNAi) has evolved as a powerful tool to regulate gene expression in a sequence-specific manner and can be used to inactivate the CCR5 mRNA. Short hairpin RNA (shRNA) molecules can impair CCR5 expression, but these molecules may cause unintended side effects and they will not be processed in cells that lack Dicer, such as monocytes...
2017: PloS One
https://www.readbyqxmd.com/read/28542086/corneal-endothelial-cells-have-an-absolute-requirement-for-cysteine-for-survival
#9
Naoki Okumura, Ryota Inoue, Kazuya Kakutani, Makiko Nakahara, Shigeru Kinoshita, Junji Hamuro, Noriko Koizumi
PURPOSE: The aim of this study was to evaluate which amino acid(s) among the 20 standard protein amino acids is indispensable for the survival of cultured human corneal endothelial cells (HCECs). METHODS: HCECs were cultured in amino acid screening media that were missing 1 specific amino acid, and cell growth was evaluated. After this first selection, we conducted a further evaluation of cell growth in response to the addition of 4 amino acids (cysteine, methionine, valine, and arginine) to amino acid-free culture media...
May 23, 2017: Cornea
https://www.readbyqxmd.com/read/28539926/gene-specific-substitution-profiles-describe-the-types-and-frequencies-of-amino-acid-changes-during-antibody-somatic-hypermutation
#10
Zizhang Sheng, Chaim A Schramm, Rui Kong, James C Mullikin, John R Mascola, Peter D Kwong, Lawrence Shapiro
Somatic hypermutation (SHM) plays a critical role in the maturation of antibodies, optimizing recognition initiated by recombination of V(D)J genes. Previous studies have shown that the propensity to mutate is modulated by the context of surrounding nucleotides and that SHM machinery generates biased substitutions. To investigate the intrinsic mutation frequency and substitution bias of SHMs at the amino acid level, we analyzed functional human antibody repertoires and developed mGSSP (method for gene-specific substitution profile), a method to construct amino acid substitution profiles from next-generation sequencing-determined B cell transcripts...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28538045/donor-derived-infections-in-solid-organ-transplant-patients-toward-a-holistic-approach
#11
Esther Benamu, Cameron R Wolfe, Jose G Montoya
PURPOSE OF REVIEW: Solid organ demand far exceeds organ supply. Strategies to increase the donor pool include the liberalization of selection criteria without increasing the risk of unexpected donor-derived infection (DDI), a rare complication of transplantation carrying high morbidity and mortality. We review the challenging aspects in the prevention of DDI, focusing on the complexities of data sharing and efficient communication and the role infectious diseases specialists play in the process...
May 19, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28537846/uremic-toxins-affect-the-imbalance-of-redox-state-and-overexpression-of-prolyl-hydroxylase-2-in-human-adipose-tissue-derived-mesenchymal-stem-cells-involved-in-wound-healing
#12
Vuong Cat Khanh, Kinuko Ohneda, Toshiki Kato, Toshiharu Yamashita, Fujio Sato, Kana Tachi, Osamu Ohneda
Chronic kidney disease (CKD) results in a delay in wound healing because of its complications such as uremia, anemia, and fluid overload. Mesenchymal stem cells (MSCs) are considered to be a candidate for wound healing because of the ability to recruit many types of cells. However, it is still unclear whether the CKD-adipose tissue-derived MSCs (CKD-AT-MSCs) have the same function in wound healing as healthy donor-derived normal AT-MSCs (nAT-MSCs). In this study, we found that uremic toxins induced elevated reactive oxygen species (ROS) expression in nAT-MSCs, resulting in the reduced expression of hypoxia-inducible factor-1α (HIF-1α) under hypoxic conditions...
May 24, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28537379/molecular-rhodium-complexes-supported-on-the-metal-oxide-like-nodes-of-metal-organic-frameworks-and-on-zeolite-hy-catalysts-for-ethylene-hydrogenation-and-dimerization
#13
Varinia Bernales, Dong Yang, Jun Yu, Gamze Gümüşlü, Christopher J Cramer, Bruce C Gates, Laura Gagliardi
Metal-organic frameworks (MOFs) with nodes consisting of zirconium oxide clusters (Zr6) offer new opportunities as supports for catalysts with well-defined, essentially molecular, structures. We used the precursor Rh(C2H4)2(acac) (acac is acetylacetonate) to anchor Rh(I) complexes to the nodes of the MOF UiO-67 and, for comparison, to the zeolite dealuminated HY (DAY). These were characterized experimentally by measurement of catalytic activities and selectivities for ethylene hydrogenation and dimerization in a once-through flow reactor at 298 K and 1 bar...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534661/characterization-of-human-fetal-brain-endothelial-cells-reveals-barrier-properties-suitable-for-in%C3%A2-vitro-modeling-of-the-bbb-with-syngenic-co-cultures
#14
Allison M Andrews, Evan M Lutton, Lee A Cannella, Nancy Reichenbach, Roshanak Razmpour, Matthew J Seasock, Steven J Kaspin, Steven F Merkel, Dianne Langford, Yuri Persidsky, Servio H Ramirez
Endothelial cells (ECs) form the basis of the blood-brain barrier (BBB), a physical barrier that selectively restricts transport into the brain. In vitro models can provide significant insight into BBB physiology, mechanisms of human disease pathology, toxicology, and drug delivery. Given the limited availability of primary human adult brain microvascular ECs ( aBMVECs), human fetal tissue offers a plausible alternative source for multiple donors and the opportunity to build syngenic tri-cultures from the same host...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28532999/size-matching-in-heart-transplantation-donor-selection-too-big-to-fail
#15
EDITORIAL
Thomas J O'Neill, Barbara Pisani
No abstract text is available yet for this article.
May 9, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28531356/spin-polarization-transfer-from-a-photogenerated-radical-ion-pair-to-a-stable-radical-controlled-by-charge-recombination
#16
Noah E Horwitz, Brian T Phelan, Jordan N Nelson, Catherine M Mauck, Matthew D Krzyaniak, Michael R Wasielewski
Photoexcitation of electron donor-acceptor molecules frequently produces radical ion pairs with well-defined initial spin-polarized states that have attracted significant interest for spintronics. Transfer of this initial spin polarization to a stable radical is predicted to depend on the rates of the radical ion pair recombination reactions, but this prediction has not been tested experimentally. In this study, a stable radical/electron donor/chromophore/electron acceptor molecule, BDPA(•)-mPD-ANI-NDI, where BDPA(•) is α,γ-bisdiphenylene-β-phenylallyl, mPD is m-phenylenediamine, ANI is 4-aminonaphthalene-1,8-dicarboximide, and NDI is naphthalene-1,4:5,8-bis(dicarboximide), was synthesized...
May 22, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28530837/stereoselective-synthesis-of-the-equatorial-glycosides-of-legionaminic-acid
#17
Oskar Popik, Bibek Dhakal, David Crich
The synthesis of a legionaminic acid donor from N-acetyl neuraminic acid in fifteen steps and 19% overall yield is described. Activation of the adamantanyl thioglycoside in the donor with N-iodosuccinimide and trifluoromethanesulfonic anhydride in dichloromethane and acetonitrile at -78 degrees C in the presence of primary secondary and tertiary alcohols affords the corresponding glycosides in excellent yield and good to excellent equatorial selectivity. In particular coupling to the 4-OH of a suitably protected neuraminic acid derivative affords a disaccharide that closely resembles the glycosidic linikage in the polylegionaminic acid from the lipopolysaccharide of the Legionella pneumophila virulence factor...
May 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28530731/controllable-mn-doped-zno-nanorods-for-direct-assembly-of-a-photoelectrochemical-aptasensor
#18
Jing Li, Zhihui Dai, Hongbo Li
A label-free photoelectrochemical (PEC) aptasensor for K(+) was first constructed by direct self-assembly of the K(+) aptamer onto the electrodeposited Mn-doped ZnO nanorods. In the presence of K(+), the conformation of G-quadruplex changes to a K(+)-stabilized conformation, which can efficiently prevent the quercetin electron donor from reaching the functionalized photoanode, thus proportionately affecting the quercetin-enhanced photocurrent response. Under the optimal experimental conditions, the fabricated biosensor exhibited a linear response in the K(+) concentration range of 0...
May 22, 2017: Analyst
https://www.readbyqxmd.com/read/28529774/synthesis-and-crystallographic-characterization-of-a-mononuclear-cobalt-iii-complex-possessing-both-thiol-ate-and-thio-ether-donors-reactivity-of-an-thiol-ate-bridged-penta-nuclear-co2ag3-complex-with-iodo-methane
#19
Yosuke Fukuda, Nobuto Yoshinari, Takumi Konno
Treatment of an S-bridged penta-nuclear Ag(I)3Co(III)2 complex, [Ag3{Co(L)}2](3+) [L(3-) = N(CH2NHCH2CH2S(-))3], in which two tris-(thiol-ate)-type mononuclear Co(III) units ([Co(L)]) are bridged by three Ag(I) ions through S atoms, with iodo-methane (CH3I) gave a new Co(III) mononuclear complex, [Co(LMe2)](2+) [LMe2(-) = N(CH2NHCH2CH2S(-))(CH2NHCH2CH2SCH3)2], systematic name: {2-[(bis{[2-(methylsulfanyl)ethyl]aminomethyl}aminomethyl)amino]ethanethiolato}cobalt(III) bis(hexafluoridophosphate). This cationic complex was crystallized with PF6(-) anions to form the title compound, [Co(LMe2)](PF6)2...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28529723/role-of-major-histocompatibility-complex-variation-in-graft-versus-host-disease-after-hematopoietic-cell-transplantation
#20
REVIEW
Effie W Petersdorf
Graft-versus-host disease (GVHD) remains a significant potentially life-threatening complication of allogeneic hematopoietic cell transplantation (HCT). Since the discovery of the human leukocyte antigen (HLA) system over 50 years ago, significant advances have clarified the nature of HLA variation between transplant recipients and donors as a chief etiology of GVHD. New information on coding and non-coding gene variation and GVHD risk provides clinicians with options to consider selected mismatched donors when matched donors are not available...
2017: F1000Research
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