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https://www.readbyqxmd.com/read/28221804/semiconductor-seeded-nanorods-with-graded-composition-exhibiting-high-quantum-yield-high-polarization-and-minimal-blinking
#1
Ido Hadar, John Patrick Philbin, Yossef Efraim Panfil, Shany Neyshtadt, Itai Lieberman, Hagai Eshet, Sorin Lazar, Eran Rabani, Uri Banin
Seeded semiconductor nanorods represent a unique family of quantum confined materials that manifest characteristics of mixed dimensionality. They show polarized emission with high quantum yield and fluorescence switching under an electric field, features that are desirable for use in display technologies and other optical applications. So far, their robust synthesis has been limited mainly to CdSe/CdS heterostructures, thereby constraining the spectral tunability to the red region of the visible spectrum. Herein we present a novel synthesis of CdSe/Cd1-xZnxS seeded nanorods with radially graded composition that show bright and highly polarized green emission with minimal intermittency, as confirmed by ensemble and single nanorods optical measurements...
February 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28218853/new-information-on-the-hydrophobic-interaction-revealed-by-frequency-modulation-afm
#2
Itai Schlesinger, Uri Sivan
Using an ultra-high resolution AFM operated in frequency modulation mode we extend existing measurements of the force acting between hydrophobic surfaces immersed in water in three essential ways. (1) The measurement range, which was previously limited to distances longer than 2-3 nanometers, is extended to cover all distances, down to contact. The measurements disclose that the long-range attraction observed also by conventional techniques, turns at distances shorter than 1-2 nanometers into pronounced repulsion...
February 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28214919/grapevine-acclimation-to-water-deficit-the-adjustment-of-stomatal-and-hydraulic-conductance-differs-from-petiole-embolism-vulnerability
#3
Uri Hochberg, Andrea Giulia Bonel, Rakefet David-Schwartz, Asfaw Degu, Aaron Fait, Hervé Cochard, Enrico Peterlunger, Jose Carlos Herrera
Drought-acclimated vines maintained higher gas exchange compared to irrigated controls under water deficit; this effect is associated with modified leaf turgor but not with improved petiole vulnerability to cavitation. A key feature for the prosperity of plants under changing environments is the plasticity of their hydraulic system. In the present research we studied the hydraulic regulation in grapevines (Vitis vinifera L.) that were first acclimated for 39 days to well-watered (WW), sustained water deficit (SD), or transient-cycles of dehydration-rehydration-water deficit (TD) conditions, and then subjected to varying degrees of drought...
February 18, 2017: Planta
https://www.readbyqxmd.com/read/28213047/the-effect-of-combined-aspirin-and-clopidogrel-treatment-on-cancer-incidence
#4
Avi Leader, Ravit Zelikson-Saporta, David Pereg, Galia Spectre, Uri Rozovski, Pia Raanani, Doron Hermoni, Michael Lishner
BACKGROUND: Multiple studies have shown an association between aspirin treatment and a reduction in newly diagnosed cancer. Conversely, there are conflicting clinical and laboratory data regarding the effect of combined clopidogrel and aspirin therapy on cancer incidence, including analyses suggesting an increased cancer risk. No large scale cohort study has been performed to address this issue in a heterogeneous real-world scenario. We investigated the effect of clopidogrel and aspirin on cancer incidence compared to aspirin alone and no antiplatelet therapy...
February 14, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28210839/thrombotic-microangiopathy-caused-by-methionine-synthase-deficiency-diagnosis-and-treatment-pitfalls
#5
Maria Helena Vaisbich, Andressa Braga, Maria Gabrielle, Clarissa Bueno, Flávia Piazzon, Fernando Kok
BACKGROUND: Inborn errors of cobalamin (Cbl) metabolism form a large group of rare diseases. One of these, Cbl deficiency type C (CblC), is a well-known cause of thrombotic microangiopathy (TMA), especially in infants. However, there has only been a single published case of TMA associated to Cbl deficiency type G (CblG), also known as methionine synthase deficiency (MSD). CASE DIAGNOSIS/TREATMENT: A 21-month-old boy presented with pallor and oral ulcers during episodes of upper respiratory infection (URI)...
February 16, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28196324/delivery-of-liposomal-quantum-dots-via-monocytes-for-imaging-of-inflamed-tissue
#6
Gil Aizik, Nir Waiskopf, Majd Agbaria, Yael Levi-Kalisman, Uri Banin, Gershon Golomb
Quantum dots (QDs), semiconductor nanocrystals, are fluorescent nanoparticles of growing interest as an imaging tool of a diseased tissue. However, a major concern is their biocompatibility, cytotoxicity, and fluorescence instability in biological milieu, impeding their use in biomedical applications, in general, and for inflammation imaging, in particular. In addition, for an efficient fluorescent signal at the desired tissue, and avoiding systemic biodistribution and possible toxicity, targeting is desired...
February 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28195285/magic-size-inp-and-inas-clusters-synthesis-characterization-and-shell-growth
#7
Jiajia Ning, Uri Banin
Magic size III-V semiconductor nanoclusters were synthesized. Non-continuous transition of the absorption spectra upon mild heating of the reaction solution is observed, indicating transformation between differently sized clusters. Further manipulation of the clusters is demonstrated for an InP MSC by growing a ZnS and ZnSe shell aiming at blue fluorescence. The quantum yield is limited due to formation of interfacial defects for thick ZnS shells.
February 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28193167/helicobacter-pylori-prevalence-and-clinical-significance-in-patients-with-quiescent-crohn-s-disease
#8
Adi Lahat, Uri Kopylov, Sandra Neuman, Nina Levhar, Doron Yablecovitch, Benjamin Avidan, Batia Weiss, Shomron Ben-Horin, Rami Eliakim
BACKGROUND: Helicobacter pylori (HP) infection is present in about 50% of the global population, and is associated with chronic gastritis, peptic disease and gastric malignancies. HP prevalence in Crohn's disease (CD) patients was shown to be low compared to the general population, and its influence on disease activity is yet to be determined. Our aims were to determine the prevalence of HP in a selected group of CD patients with quiescent disease, and to assess the influence of its eradication on disease activity and endoscopic and laboratory activity measures...
February 13, 2017: BMC Gastroenterology
https://www.readbyqxmd.com/read/28192296/simple-and-cost-effective-fluorescent-labeling-of-5-hydroxymethylcytosine
#9
Tamar Shahal, Ori Green, Uri Hananel, Yael Michaeli, Doron Shabat, Yuval Ebenstein
The nucleobase 5-hydroxymethylcytosine (5-hmC), a modified form of cytosine, is an important epigenetic mark related to regulation of gene expression. 5-hmC levels are highly dynamic during early development and are modulated during the progression of neurodegenerative disease and cancer. We describe a spectroscopic method for the global quantification of 5-hmC in genomic DNA. This method relies on the enzymatic glucosylation of 5-hmC, followed by a glucose oxidation step that results in the formation of aldehyde moieties that are covalently linked to a fluorescent reporter by oxime ligation...
October 7, 2016: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28191984/explicit-and-implicit-self-evaluations-in-social-anxiety-disorder
#10
Eva Gilboa-Schechtman, Hadar Keshet, Tamar Livne, Uri Berger, Reut Zabag, Haggai Hermesh, Sofi Marom
Cognitive models of social anxiety disorder (SAD) emphasize the role of explicit and implicit self-evaluations (SEs) in the etiology and maintenance of this condition. Whereas individuals with SAD consistently report lower explicit SEs as compared with nonanxious individuals, findings concerning implicit SEs are mixed. To gain a more nuanced understanding of the nature of SEs in SAD, we examined explicit and implicit SEs in two significant interpersonal domains: social rank and affiliation. Consistent with cognitive theorizing, we predicted that, compared to nonclinical controls (NCCs), individuals with SAD would exhibit lower explicit and implicit SEs in both domains...
February 13, 2017: Journal of Abnormal Psychology
https://www.readbyqxmd.com/read/28187073/prolonged-preoperative-opioid-therapy-in-patients-with-degenerative-lumbar-stenosis-in-a-workers-compensation-setting
#11
Erik Y Tye, Joshua Anderson, Mhamad Faour, Arnold Haas, Rick Percy, Stephen T Woods, Uri M Ahn, Nicholas Ahn
STUDY DESIGN: Retrospective cohort study OBJECTIVE.: To investigate the impact of prolonged opioid use in the preoperative treatment plan of degenerative lumbar stenosis (DLS) SUMMARY OF BACKGROUND DATA.: Patients undergoing operative treatment for DLS with concomitant opioid use represent a clinically challenging population. The relative paucity of data on the relationship between preoperative opioid use and clinical outcomes in the Workers' compensation (WC) population necessitates further study of this unique population...
February 9, 2017: Spine
https://www.readbyqxmd.com/read/28181568/predictive-modeling-of-physician-patient-dynamics-that-influence-sleep-medication-prescriptions-and-clinical-decision-making
#12
Andrew L Beam, Uri Kartoun, Jennifer K Pai, Arnaub K Chatterjee, Timothy P Fitzgerald, Stanley Y Shaw, Isaac S Kohane
Insomnia remains under-diagnosed and poorly treated despite its high economic and social costs. Though previous work has examined how patient characteristics affect sleep medication prescriptions, the role of physician characteristics that influence this clinical decision remains unclear. We sought to understand patient and physician factors that influence sleep medication prescribing patterns by analyzing Electronic Medical Records (EMRs) including the narrative clinical notes as well as codified data. Zolpidem and trazodone were the most widely prescribed initial sleep medication in a cohort of 1,105 patients...
February 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28181383/slowly-on-slowly-off-bisubstrate-analogue-conjugates-of-5-iodotubercidin-and-histone-h3-peptide-targeting-protein-kinase-haspin
#13
Katrin Kestav, Kaido Viht, Anton Konovalov, Erki Enkvist, Asko Uri, Darja Lavogina
The atypical protein kinase Haspin serves as one of a key players in mitosis by catalysing phosphorylation of Thr3 in histone H3, and thus sustaining the normal functioning of the chromosomal passenger complex. Here, we report the development of bisubstrate-analogue inhibitors targeting Haspin. The compounds were constructed by linking 5-iodotubercidin moiety to the N-terminal sequence of histone H3. The new conjugates possessed high affinity (KD in the subnanomolar range) towards Haspin as well as slow kinetics of association and dissociation (residence time on the scale of several hours), which reflected their unique binding mode and translated into improved selectivity...
February 9, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28178518/an-evolutionarily-conserved-soxb-hdac2-crosstalk-regulates-neurogenesis-in-a-cnidarian
#14
Hakima Flici, Christine E Schnitzler, R Cathriona Millane, Graham Govinden, Amy Houlihan, Stephanie D Boomkamp, Sanbing Shen, Andreas D Baxevanis, Uri Frank
SoxB transcription factors and histone deacetylases (HDACs) are each major players in the regulation of neurogenesis, but a functional link between them has not been previously demonstrated. Here, we show that SoxB2 and Hdac2 act together to regulate neurogenesis in the cnidarian Hydractinia echinata during tissue homeostasis and head regeneration. We find that misexpression of SoxB genes modifies the number of neural cells in all life stages and interferes with head regeneration. Hdac2 was co-expressed with SoxB2, and its downregulation phenocopied SoxB2 knockdown...
February 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/28178369/burden-of-human-metapneumovirus-infections-in-patients-with-cancer-risk-factors-and-outcomes
#15
Firas El Chaer, Dimpy P Shah, Joumana Kmeid, Ella J Ariza-Heredia, Chitra M Hosing, Victor E Mulanovich, Roy F Chemaly
BACKGROUND: Human metapneumovirus (hMPV) causes upper and lower respiratory tract infections (URIs and LRIs, respectively) in healthy and immunocompromised patients; however, its clinical burden in patients with cancer remains unknown. METHODS: In a retrospective study of all laboratory-confirmed hMPV infections treated at the authors' institution between April 2012 and May 2015, clinical characteristics, risk factors for progression to an LRI, treatment, and outcomes in patients with cancer were determined...
February 8, 2017: Cancer
https://www.readbyqxmd.com/read/28178003/efficacy-and-safety-of-vedolizumab-for-induction-of-remission-in-inflammatory-bowel-disease-the-israeli-real-world-experience
#16
Uri Kopylov, Yulia Ron, Irit Avni-Biron, Benjamin Koslowsky, Matti Waterman, Saleh Daher, Bella Ungar, Henit Yanai, Nitsan Maharshak, Ofer Ben-Bassat, Lev Lichtenstein, Ariella Bar-Gil Shitrit, Eran Israeli, Doron Schwartz, Eran Zittan, Rami Eliakim, Yehuda Chowers, Shomron Ben-Horin, Iris Dotan
BACKGROUND: Vedolizumab (VDZ) is an anti-integrin monoclonal antibody effective in ulcerative colitis (UC) and Crohn's disease (CD). The aim of this study was to examine the "real world" efficacy and safety of VDZ in a large national patient cohort. METHODS: Patients with inflammatory bowel disease treated with VDZ were prospectively followed for 14 weeks. Patients who completed the induction protocol (week 0/2/6/14) or discontinued the treatment before week 14 for adverse events (AEs) or primary nonresponse were included...
February 7, 2017: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/28175990/starplasty-tracheostomy-case-series-and-literature-review
#17
Yehuda Schwarz, Nidal Muhanna, David Raveh, Chanan Shaul, Sarit Shahroor, Uri Peleg, Pierre Attal, Jean-Yves Sichel
OBJECTIVES: The starplasty tracheostomy (SPT) technique has been suggested to reduce the short-term complications of tracheostomy, including accidental decannulation and pneumothorax. The aim of the present study was to conduct a review of key parameters prior to and following treatment of neonates and children with the SPT technique, including indications, complications, perioperative department stay, and overall length of stay in one University-Affiliated Medical Center. METHODS: A retrospective chart review of all children under the age of 18 underwent SPT in a single center between February 2006 and January 2012...
February 7, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28173991/damage-of-eukaryotic-cells-by-the-pore-forming-toxin-sticholysin-ii-consequences-of-the-potassium-efflux
#18
Sheila Cabezas, Sylvia Ho, Uris Ros, María E Lanio, Carlos Alvarez, F Gisou van der Goot
Pore-forming toxins (PFTs) form holes in membranes causing one of the most catastrophic damages to a target cell. Target organisms have evolved a regulated response against PFTs damage including cell membrane repair. This ability of cells strongly depends on the toxin concentration and the properties of the pores. It has been hypothesized that there is an inverse correlation between the size of the pores and the time required to repair the membrane, which has been for long a non-intuitive concept and far to be completely understood...
February 4, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28169831/design-principles-of-autocatalytic-cycles-constrain-enzyme-kinetics-and-force-low-substrate-saturation-at-flux-branch-points
#19
Uri Barenholz, Dan Davidi, Eduard Reznik, Yinon Bar-On, Niv Antonovsky, Elad Noor, Ron Milo
A set of chemical reactions that require a metabolite to synthesize more of that metabolite is an autocatalytic cycle. Here we show that most of the reactions in the core of central carbon metabolism are part of compact autocatalytic cycles. Such metabolic designs must meet specific conditions to support stable fluxes, hence avoiding depletion of intermediate metabolites. As such, they are subjected to constraints that may seem counter-intuitive: the enzymes of branch reactions out of the cycle must be overexpressed and the affinity of these enzymes to their substrates must be relatively weak...
February 7, 2017: ELife
https://www.readbyqxmd.com/read/28169008/relationship-of-medial-versus-superior-vocal-cord-location-of-t1-squamous-cell-carcinoma-with-tumor-recurrence
#20
Uri Alkan, Yuval Nachalon, Aron Popovtzer, Sharon Tzelnick, Dan Yaniv, Jacob Shvero
OBJECTIVE: To determine if the clinical behavior of T1 glottic squamous cell carcinoma varies by its location on the medial free edge or upper aspect of the vocal cords. STUDY DESIGN: Retrospective cohort. SETTING: Single tertiary university-affiliated medical center. SUBJECTS AND METHODS: Clinical, treatment, and outcome data were collected for 104 patients with T1N0M0 glottic squamous cell carcinoma who were treated and followed at our center in 1995-2013...
February 2, 2017: American Journal of Otolaryngology
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