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https://www.readbyqxmd.com/read/28937776/4-c-methoxy-2-deoxy-2-fluoro-modified-ribonucleotides-improve-metabolic-stability-and-elicit-efficient-rnai-mediated-gene-silencing
#1
Elise Malek-Adamian, Dale Guenther, Shigeo Matsuda, Saúl Martínez-Montero, Ivan Zlatev, Joel Harp, Mihai Burai Patrascu, Donald J Foster, Johans J Fakhoury, Lydia Perkins, Nicolas Moitessier, Rajar Manoharan, Nate Taneja, Anna Bisbe, Klaus Charisse, Martin A Maier, Kallanthottathil G Rajeev, Martin Egli, Muthiah Manoharan, Masad J Damha
We designed novel 4'-modified 2'-deoxy-2'-fluorouridine (2'-F U) analogues with the aim to improve nuclease resistance and potency of therapeutic siRNAs by introducing 4'-C-methoxy (4'-OMe) as the alpha (C4'α) or beta (C4'β) epimers. The C4'α epimer was synthesized by a stereoselective route in six steps; however, both α and β epimers could be obtained by a non-stereoselective approach starting from 2'-F U. (1)H-NMR analysis and computational investigation of the α-epimer revealed that the 4'-OMe imparts a conformational bias towards the North-East sugar pucker, due to intramolecular hydrogen bonding and hyperconjugation effects...
September 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28936605/sex-determination-of-a-tunisian-population-by-ct-scan-analysis-of-the-skull
#2
Malek Zaafrane, Mehdi Ben Khelil, Ines Naccache, Ekbel Ezzedine, Frédéric Savall, Norbert Telmon, Najla Mnif, Moncef Hamdoun
It is widely accepted that the estimation of biological attributes in the human skeleton is more accurate when population-specific standards are applied. With the shortage of such data for contemporary North African populations, it is duly required to establish population-specific standards. We present here the first craniometric standards for sex determination of a contemporary Tunisian population. The aim of this study was to analyze the correlation between sex and metric parameters of the skull in this population using CT scan analysis and to generate proper reliable standards for sex determination of a complete or fragmented skull...
September 21, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28930192/nanocrystalline-al7075-1-wt-zr-alloy-prepared-using-mechanical-milling-and-spark-plasma-sintering
#3
Orsolya Molnárová, Přemysl Málek, Jozef Veselý, Michaela Šlapáková, Peter Minárik, František Lukáč, Tomáš Chráska, Pavel Novák, Filip Průša
The microstructure, phase composition, and microhardness of both gas-atomized and mechanically milled powders of the Al7075 + 1 wt % Zr alloy were investigated. The gas-atomized powder exhibited a cellular microstructure (grain size of a few µm) with layers of intermetallic phases along the cell boundaries. Mechanical milling (400 revolutions per minute (RPM)/8 h) resulted in a grain size reduction to the nanocrystalline range (20 to 100 nm) along with the dissolution of the intermetallic phases. Milling led to an increase in the powder's microhardness from 97 to 343 HV...
September 20, 2017: Materials
https://www.readbyqxmd.com/read/28926797/experimental-study-of-radiation-dose-rate-at-different-strategic-points-of-the-baec-triga-research-reactor
#4
M Ajijul Hoq, M A Malek Soner, M A Salam, M M Haque, Salma Khanom, S M Fahad
The 3MW TRIGA Mark-II Research Reactor of Bangladesh Atomic Energy Commission (BAEC) has been under operation for about thirty years since its commissioning at 1986. In accordance with the demand of fundamental nuclear research works, the reactor has to operate at different power levels by utilizing a number of experimental facilities. Regarding the enquiry for safety of reactor operating personnel and radiation workers, it is necessary to know the radiation level at different strategic points of the reactor where they are often worked...
September 9, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28923733/demulsification-to-control-solute-release-from-pickering-crystal-stabilized-water-in-oil-emulsions
#5
Xin Zhao, Biyun Huang, Malek El-Aooiti, Dérick Rousseau
Controlled demulsification was used to tailor the release of NaCl as a solute from water-in-oil (W/O) emulsion droplets encased in glycerol monostearate (GMS) crystalline shells. Under quiescent conditions at room temperature, the GMS shells behaved as an effective barrier against salt diffusion. A second surfactant, sorbitan monooleate (SMO), added to the emulsion post-preparation to controllably demulsify, resulted in concentration-dependent removal of the interfacially-bound GMS crystals resulting in aqueous droplet coalescence...
August 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28919600/modified-blatchford-score-for-risk-stratification-in-adult-patient-with-nonvariceal-upper-gastrointestinal-haemorrhage-and-their-short-term-hospital-outcome
#6
M S Islam, M Z Uddin, M S Ali, M N Islam, M H Rahman, I H Robi, M M Haque, M W Rahman, M A Uddin, F Ahamed, M S Malek, M A Kabir, M S Rahman, A U Khan, F A Doel
Upper gastrointestinal hemorrhage (UGIH) is one of the most common and life-threatening gastrointestinal emergency. There are several risk scores for risk stratification in UGIB patients. The Modified Blatchford score, which relies only on clinical and laboratory parameters, is practical in the emergency setting The Modified Blatchford scoring system also known as Glasgow Blatchford Scoring (GBS) have been developed to stratify risk of non variceal upper gastrointestinal hemorrhage or need of medical or surgical intervention, endoscopic therapy...
July 2017: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/28916500/early-life-stress-modulates-neural-networks-associated-with-habitual-use-of-reappraisal
#7
Elissa El Khawli, Yan Fan, Sabine Aust, Katharina Wirth, Luisa Bönke, Amie Stevense, Ana Herrera, Sophie Metz, Andrea Loayza, Malek Bajbouj, Simone Grimm
Recent evidence shows that early life stress (ELS) is associated with altered resting-state functional connectivity (RSFC) between amygdala and the prefrontal cortex, as well as with maladaptive emotion regulation strategies and negative mood. However, the relation between ELS and maladaptive emotion regulation is not deterministic. Adaptive emotion regulation strategies such as reappraisal can also ensue from experience and learning in adulthood and can prevent negative mood. The present study aims to investigate the joint influence of ELS, in particular early-life emotional abuse (EA), and habitual use of reappraisal on amygdala-centered RSFC and mood...
September 12, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28915338/neurocognitive-psychosocial-and-quality-of-life-outcomes-in-adult-survivors-of-childhood-non-hodgkin-lymphoma
#8
Matthew J Ehrhardt, Daniel A Mulrooney, Chenghong Li, Malek J Baassiri, Kari Bjornard, John T Sandlund, Tara M Brinkman, I-Chan Huang, Deo Kumar Srivastava, Kirsten K Ness, Leslie L Robison, Melissa M Hudson, Kevin R Krull
BACKGROUND: Children with non-Hodgkin lymphoma (NHL) undergo treatment with central nervous system-directed therapy, the potentially neurotoxic effects of which have not been reported in NHL survivors. METHODS: NHL survivors (n = 187) participating in the St. Jude Lifetime Cohort who were 10 or more years from their diagnosis and were 18 years old or older underwent neurocognitive, emotional distress (Brief Symptom Inventory 18), and health-related quality of life (HRQOL) assessments (36-Item Short Form Health Survey)...
September 15, 2017: Cancer
https://www.readbyqxmd.com/read/28912297/cyclin-d1-negative-mantle-cell-lymphoma-with-aberrant-cd3-expression
#9
Anita Malek, Govind Bhagat
No abstract text is available yet for this article.
September 14, 2017: Blood
https://www.readbyqxmd.com/read/28903602/role-of-maternal-serum-ferritin-in-prediction-of-preterm-labour
#10
Khaled Abdel-Malek, Mohamed Ahmed El-Halwagi, Bahaa Eldin Hammad, Osama Azmy, Omneya Helal, Marwa Eid, Mazen Abdel-Rasheed
The aim of this study was to evaluate the value of measurement of serum ferritin level in pregnant women to predict preterm labour. The study included 236 women whose haemoglobin (Hb) levels were ≥10.5 gm/dl and gestational age (GA) was less than 30 weeks. Serum ferritin levels were measured at 30 weeks of gestational age. At the end of the study, 23 women delivered with preterm premature rupture of membrane (PPROM) and 17 women delivered before 37 weeks but without PROM (study group). The rest of the pregnant women (196 women) delivered between 37 and 40 weeks (control group)...
September 14, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28901851/gestational-diabetes-mellitus-post-partum-risk-and-follow-up
#11
Silpa Poola-Kella, Rachel A Steinman, Bayan Mesmar, Rana Malek
BACKGROUND: Women with gestational diabetes mellitus (GDM) are at an increased risk for developing metabolic syndrome, type 2 diabetes mellitus (T2DM), and cardiovascular disease. In this review, we will discuss postpartum cardiovascular and diabetes risk in women with a history of GDM and different ways to improve postpartum screening. METHODS: This review involves a comprehensive literature review on gestational diabetes and post-partum risk for cardiovascular disease and diabetes mellitus as well as post-partum screening methods...
September 11, 2017: Reviews on Recent Clinical Trials
https://www.readbyqxmd.com/read/28901638/adc-derived-spatial-features-can-accurately-classify-adnexal-lesions
#12
Anahita Fathi Kazerooni, Mahnaz Nabil, Hamidreza Haghighat Khah, Mohammadreza Alviri, Maryam Heidari-Sooreshjaani, Masoumeh Gity, Mahrooz Malek, Hamidreza Saligheh Rad
BACKGROUND: The role of quantitative apparent diffusion coefficient (ADC) maps in differentiating adnexal masses is unresolved. PURPOSE/HYPOTHESIS: To propose an objective diagnostic method devised based on spatial features for predicting benignity/malignancy of adnexal masses in ADC maps. STUDY TYPE: Prospective. POPULATION: In all, 70 women with sonographically indeterminate and histopathologically confirmed adnexal masses (38 benign, 3 borderline, and 29 malignant) were considered for this study...
September 13, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28899099/accurately-modeling-the-conformational-preferences-of-nucleosides
#13
Mihai Burai Patrascu, Elise Malek-Adamian, Masad J Damha, Nicolas Moitessier
Sugar puckering of nucleosides impacts nucleic acid structures, and hence their biological function. Similarly, nucleoside en-zyme inhibitors may adopt different conformations affecting their binding affinity, DNA incorporation and excision rates. As a result, significant efforts have been made to develop nucleo-side analogues adopting specific conformations to improve bioactivity and pharmacokinetic profiles of the corresponding nucleoside-containing drugs. Understanding and ultimately predicting these conformational preferences would significantly help the design of more effective structures...
September 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28890157/the-cumulative-burden-of-surviving-childhood-cancer-an-initial-report-from-the-st-jude-lifetime-cohort-study-sjlife
#14
Nickhill Bhakta, Qi Liu, Kirsten K Ness, Malek Baassiri, Hesham Eissa, Frederick Yeo, Wassim Chemaitilly, Matthew J Ehrhardt, Johnnie Bass, Michael W Bishop, Kyla Shelton, Lu Lu, Sujuan Huang, Zhenghong Li, Eric Caron, Jennifer Lanctot, Carrie Howell, Timothy Folse, Vijaya Joshi, Daniel M Green, Daniel A Mulrooney, Gregory T Armstrong, Kevin R Krull, Tara M Brinkman, Raja B Khan, Deo K Srivastava, Melissa M Hudson, Yutaka Yasui, Leslie L Robison
BACKGROUND: Survivors of childhood cancer develop early and severe chronic health conditions (CHCs). A quantitative landscape of morbidity of survivors, however, has not been described. We aimed to describe the cumulative burden of curative cancer therapy in a clinically assessed ageing population of long-term survivors of childhood cancer. METHODS: The St Jude Lifetime Cohort Study (SJLIFE) retrospectively collected data on CHCs in all patients treated for childhood cancer at the St Jude Children's Research Hospital who survived 10 years or longer from initial diagnosis and were 18 years or older as of June 30, 2015...
September 7, 2017: Lancet
https://www.readbyqxmd.com/read/28888931/biomechanical-testing-of-zirconium-dioxide-osteosynthesis-system-for-le-fort-i-advancement-osteotomy-fixation
#15
Lukas Hingsammer, Markus Grillenberger, Martin Schagerl, Michael Malek, Stefan Hunger
The following work is the first evaluating the applicability of 3D printed zirconium dioxide ceramic miniplates and screws to stabilize maxillary segments following a Le-Fort I advancement surgery. Conventionally used titanium and individual fabricated zirconium dioxide miniplates were biomechanically tested and compared under an occlusal load of 120N and 500N using 3D finite element analysis. The overall model consisted of 295,477 elements. Under an occlusal load of 500N a safety factor before plastic deformation respectively crack of 2...
September 5, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28888580/predicting-brain-metastasis-in-breast-cancer-patients-stage-versus-biology
#16
Hamdy A Azim, Raafat Abdel-Malek, Loay Kassem
BACKGROUND: Brain metastasis (BM) is a life-threatening event in breast cancer patients. Identifying patients at a high risk for BM can help to adopt screening programs and test preventive interventions. We tried to identify the incidence of BM in different stages and subtypes of breast cancer. PATIENTS AND METHODS: We reviewed the clinical records of 2193 consecutive breast cancer patients who presented between January 1999 and December 2010. We explored the incidence of BM in relation to standard clinicopathological factors, and determined the cumulative risk of BM according to the disease stage and phenotype...
August 18, 2017: Clinical Breast Cancer
https://www.readbyqxmd.com/read/28888073/selective-decline-of-neurotrophin-and-neurotrophin-receptor-genes-within-ca1-pyramidal-neurons-and-hippocampus-proper-correlation-with-cognitive-performance-and-neuropathology-in-mild-cognitive-impairment-and-alzheimer-s-disease
#17
Stephen D Ginsberg, Michael H Malek-Ahmadi, Melissa J Alldred, Shaoli Che, Irina Elarova, Yinghua Chen, Freddy Jeanneteau, Thorsten M Kranz, Moses V Chao, Scott E Counts, Elliott J Mufson
Hippocampal CA1 pyramidal neurons, a major component of the medial temporal lobe memory circuit, are selectively vulnerable during the progression of Alzheimer's disease (AD). The cellular mechanism(s) underlying degeneration of these neurons and the relationship to cognitive performance remains largely undefined. Here, we profiled neurotrophin and neurotrophin receptor gene expression within microdissected CA1 neurons along with regional hippocampal dissections from subjects who died with a clinical diagnosis of no cognitive impairment (NCI), mild cognitive impairment (MCI), or AD using laser capture microdissection (LCM), custom-designed microarray analysis, and qPCR of CA1 subregional dissections...
September 9, 2017: Hippocampus
https://www.readbyqxmd.com/read/28886422/initial-evaluation-of-a-99m-tc-cyclopentadienyltricarbonyl-technetium-complex-as-a-potential-5-ht1a-receptor-imaging-agent
#18
Nadia Malek Saied, Najoua Mejri, Mouna Raddaoui, Mouldi Saidi
No abstract text is available yet for this article.
August 31, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28882724/evaluation-of-the-scientific-impact-of-the-ebola-epidemic-a-systematic-review
#19
REVIEW
Nico T Mutters, Veronika Malek, Selidji T Agnandji, Frank Günther, Evelina Tacconelli
OBJECTIVES: The Ebola outbreak prompted an extensive number of scientific publications. Yet little attention has been paid to the involvement of scientific communities, the scientific impact as well as provided funding. We sought to systematically review publicly available information on the scientific impact of the Ebola epidemic. METHODS: A systematic review of scientific literature was performed. Information on the scientific impact of the Ebola epidemic including the involvement of scientific communities by determining the origins, funding, and impact factor (IF) of publications between December 6, 2013, and December 22, 2015 were included...
September 4, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28878937/contrast-sensitivity-to-spatial-gratings-in-moderate-and-dim-light-conditions-in-patients-with-diabetes-in-the-absence-of-diabetic-retinopathy
#20
Sare Safi, Anoushiravan Rahimi, Afsaneh Raeesi, Hamid Safi, Mohammad Aghazadeh Amiri, Mojtaba Malek, Mehdi Yaseri, Mohammad Haeri, Frank A Middleton, Eduardo Solessio, Hamid Ahmadieh
OBJECTIVE: To evaluate the ability of contrast sensitivity (CS) to discriminate loss of visual function in diabetic subjects with no clinical signs of retinopathy relative to that of normal subjects. RESEARCH DESIGN AND METHODS: In this prospective cross-sectional study, we measured CS in 46 diabetic subjects with a mean age of 48±6 years, a best-corrected visual acuity of 20/20 and no signs of diabetic retinopathy. The CS in these subjects was compared with CS measurements in 46 normal control subjects at four spatial frequencies (3, 6, 12, 18 cycles per degree) under moderate (500 lux) and dim (less than 2 lux) background light conditions...
2017: BMJ Open Diabetes Research & Care
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