79,793 results match your criteria Asymmetric Periflexural Exanthem of Childhood


Hierarchical Predictive Information Is Channeled by Asymmetric Oscillatory Activity.

Neuron 2018 Dec;100(5):1022-1024

Department of Basic Neurosciences, University of Geneva, Biotech Campus, 9 chemin des Mine 1211 Geneva, Switzerland.

Predictive coding and neural oscillations are two descriptive levels of brain functioning whose overlap is not yet understood. Chao et al. (2018) now show that hierarchical predictive coding is instantiated by asymmetric information channeling in the γ and α/β oscillatory ranges. Read More

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December 2018

[Evaluation of The Medical Board Exam in Portugal].

Acta Med Port 2018 Nov 30;31(11):670-679. Epub 2018 Nov 30.

Faculdade de Medicina. Universidade de Coimbra. Coimbra. Serviço de Otorrinolaringologia. Centro Hospitalar e Universitário de Coimbra. Coimbra. Coimbra Institute for Clinical and Biomedical Research (iCBR). Coimbra. Portugal.

Introduction: There is a high heterogeneity in the structure of postgraduate medical training evaluation worldwide. However, in contrast to other countries, there have been no scientific studies of the final medical board examination, in Portugal. The present study aimed to evaluate the adequacy of the medical board examination including its validity as measured by its association with medical school grade average and national seriation examination. Read More

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November 2018
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The Effects of Load Stability and Visual Access During Asymmetric Lifting Tasks on Back and Upper Extremity Biomechanical Responses.

Hum Factors 2018 Dec 6:18720818814107. Epub 2018 Dec 6.

The Ohio State University, Columbus.

Objective:: To explore the change of muscular and biomechanical responses in different load stability and visual access conditions during an asymmetric lifting task.

Background:: Previous studies found that lifting unstable loads resulted in changes to the biomechanical loads experienced by the spine and upper extremities. However, researchers have not extensively investigated behaviors when people lift potentially unstable loads. Read More

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December 2018

Asymmetric Synthesis of Chiral Flavan-3-Ols.

Nat Prod Res 2018 Dec 6:1-16. Epub 2018 Dec 6.

a Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China , Hengyang , Hunan , PR China.

Flavan-3-ols are a series of natural products widely present in plants and show versatile biological activities. The structures of such compounds are characterized by owing two adjacent chiral centers and three rings. Their interesting structures and promising biological activities have driven increasing research developments toward the preparation of enantioenriched flavan-3-ols. Read More

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December 2018
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Chemoenzymatic synthesis of substituted azepanes by sequential biocatalytic reduction and organolithium-mediated rearrangement.

J Am Chem Soc 2018 Dec 6. Epub 2018 Dec 6.

Enantioenriched 2-aryl azepanes and 2-arylbenzazepines were generated biocatalytically by asymmetric reductive amination using imine reductases or by deracemisation using monoamine oxidases. The amines were converted to the corresponding N'-aryl ureas, which rearranged on treatment with base with stereospecific transfer of the aryl substituent to the 2-position of the heterocycle via a configurationally stable benzyllithium intermediate. The products are previously inaccessible enanti-oenriched 2,2-disubstituted azepanes and benzazepines. Read More

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December 2018

Enantioselective synthesis and absolute configuration determination of hydroxywilfordic acid in sesquiterpene pyridine alkaloids.

Org Biomol Chem 2018 Dec 6. Epub 2018 Dec 6.

College of Pharmacy and Gachon Institute of Pharmaceutical Sciences, Gachon University, Incheon 21936, Republic of Korea.

An enantioselective synthetic route to hydroxywilfordic acid, a key subunit of sesquiterpene pyridine alkaloids such as wilfortrine, was developed. Asymmetric cyanation using Jacobsen's (R,R)-amino-thiourea and hydrolysis were performed to afford chiral α-hydroxy-α-methyl acid as the (S)-isomer. Naturally derived hydroxywilfordate prepared by methanolysis of wilfortrine was found to be the (R)-isomer upon comparison with the synthetic compound. Read More

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December 2018

Catalytic Asymmetric Ring-Opening/Cyclopropanation of Cyclic Sulfur Ylides: Construction of Sulfur-Containing Spirocyclopropyloxindoles with Three Vicinal Stereocenters.

Org Lett 2018 Dec 6. Epub 2018 Dec 6.

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China.

A highly efficient asymmetric ring-opening/cyclopropanation reaction of ( E)-3-(oxyethylidene)-2-oxoindolines with 1-alkyl-3-oxotetrahydro-1 H-thiophen-1-ium salts as cyclic sulfur ylides was realized by using a chiral N, N'-dioxide/Mg(OTf) complex as catalyst. A range of sulfur-containing syn, anti spirocyclopropyloxindoles with three contiguous stereocenters were obtained in excellent yields with excellent dr and good ee values under mild reaction conditions. The origin of stereoselectivity was discussed. Read More

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December 2018

Dermoscopy of cutaneous smooth muscle neoplasms: a morphological study of 136 cases.

J Eur Acad Dermatol Venereol 2018 Dec 6. Epub 2018 Dec 6.

Dermatology Department. Hospital, Universitario de Alicante. ISABIAL. Miguel Hernandez University. Sant Joan de Alicante, Spain.

Background: A variety of cutaneous smooth muscle neoplasms may arise in the skin and are frequently unrecognized by clinicians. There is sparse data relating to the dermoscopy of piloleiomyiomas (PL) and nothing has been published about the dermoscopy of angioleiomyomas (AL) and leiomyosarcomas (LS).

Objectives: To evaluate the morphological findings of a large series of cutaneous PL, AL and LS under dermoscopic observation, comparing these findings among them. Read More

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December 2018
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Rapid tool for identification of bacterial strains using Fourier-transform infrared spectroscopy on genomic DNA.

J Appl Microbiol 2018 Dec 5. Epub 2018 Dec 5.

Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology, Jeongeup, Jeollabuk-do, 56212, Korea.

Aims: We developed a new rapid and reliable method for identifying bacteria using a combination of Fourier transform infrared (FT-IR) spectroscopy of bacterial genomic DNA and multivariate analysis.

Methods And Results: FT-IR spectra of genomic DNA from four type strains of Pseudomonas spp., three Escherichia spp. Read More

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December 2018

Scalable Enantioselective Total Synthesis of (-)-Goniomitine.

Angew Chem Int Ed Engl 2018 Dec 5. Epub 2018 Dec 5.

CHINA.

A scalable enantioselective total synthesis of (-)-goniomitine has been developed by using an iridium-catalyzed asymmetric hydrogenation of exocyclic enone ester to control the configuration of molecule. The synthesis begins from commercially available starting materials, and integrated asymmetric ketone hydrogenation, Johnson-Claisen rearrangement, and one-pot oxidation/deprotection/cyclization process. With this highly efficient and scalable strategy (-)-goniomitine was synthesized in eleven steps with 27% overall yield, and the formal enantioselective synthesis of (+)-1,2-dehydroaspidospermidine, (+)-aspidospermidine and (+)-vincadifformine were also achieved. Read More

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December 2018
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Enantioselective vinylation of aldehydes with the vinyl Grignard reagent catalyzed by magnesium complex of chiral BINOLs.

Chirality 2018 Dec 6. Epub 2018 Dec 6.

Institute of Biochemistry and Molecular Biology, School of Life Sciences, Lanzhou University, Lanzhou, China.

Enantioselective vinylation of aldehydes via direct catalytic asymmetric Grignard reaction of aldehdyes and the vinyl Grinard reagent is a long-standing challenge. This work demonstrated that the magnesium (S)-3,3'-dimethyl BINOLate enantioselectively catalyze the direct vinylation of aldehydes with the deactivated vinylmagnesium bromide by bis(2-[N,N'-dimethylamino]ethyl) ether (BDMAEE) in the addition of n-butylmagnesium chloride. The highest ee of 63% was achieved up to date. Read More

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December 2018

Comprehensive analysis of presurgical factors predicting psychiatric disorders in patients with refractory temporal lobe epilepsy and mesial temporal sclerosis underwent cortico-amygdalohippocampectomy.

J Clin Lab Anal 2018 Dec 5:e22724. Epub 2018 Dec 5.

Department of Neurosurgery, Hospital of Chengdu Office of People's Government of Tibetan Autonomous Region, Chengdu, China.

Background: This study aimed to evaluate the predictive value of presurgical factors for psychiatric disorders (PD) in refractory temporal lobe epilepsy and mesial temporal sclerosis (TLE-MTS) patients underwent cortico-amygdalohippocampectomy (CAH).

Methods: A total of 98 refractory TLE-MTS patients underwent CAH were consecutively enrolled in this cohort study. Several presurgical factors were recorded, such as married status, employment status, highest education, disease duration, family history of epilepsy, and disorganized VEEG background activity. Read More

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December 2018

Continuous degradation of Direct Red 23 by calcium pectate-bound Ziziphus mauritiana peroxidase: identification of metabolites and degradation routes.

Environ Sci Pollut Res Int 2018 Dec 5. Epub 2018 Dec 5.

Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, U.P., 202002, India.

In the present study, oxido-reductive degradation of diazo dye, Direct Red 23, has been carried out by Ziziphus mauritiana peroxidases (specific activity 17.6 U mg). Peroxidases have been immobilized via simple adsorption and cross-linking by glutaraldehyde; adsorbed and cross-linked enzyme retained 94. Read More

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December 2018
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The importance of competition for light depends on productivity and disturbance.

Ecol Evol 2018 Nov 26;8(22):10655-10661. Epub 2018 Oct 26.

Department of Plant Sciences University of Oxford Oxford UK.

Eutrophication is a major cause of biodiversity loss. In grasslands, this appears to occur due to asymmetric competition for light following the increases in aboveground biomass production. Here, we report the results of an experiment with five grass species that tests how well-competitive outcomes can be predicted under a factorial combination of fertilized and disturbed (frequent cutting) conditions. Read More

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November 2018

Sox2 is associated with cancer stem-like properties in colorectal cancer.

Sci Rep 2018 Dec 5;8(1):17639. Epub 2018 Dec 5.

Department of Surgery, Gastroenterological Surgery, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka, 565-0871, Japan.

Sox2 is known as the undifferentiated cell marker. Recent studies have shown that Sox2 may also be involved in the maintenance of cancer stem cells (CSCs) in skin and bladder cancers. In this study, we aimed to clarify the role of Sox2 in colorectal CSCs. Read More

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December 2018
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Measurement-Device-Independent Quantum Key Distribution over asymmetric channel and unstable channel.

Sci Rep 2018 Dec 5;8(1):17634. Epub 2018 Dec 5.

State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing, 100084, People's Republic of China.

We show that a high key rate of Measurement-Device-Independent Quantum Key Distribution (MDIQKD) over asymmetric and unstable quantum channel can be obtained by full optimization and compensation. Employing a gradient optimization method, we make the full optimization taking both the global optimization for the 12 independent parameters and the joint constraints for statistical fluctuations. We present a loss-compensation method by monitoring the channel loss for an unstable channel. Read More

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December 2018

p73 regulates ependymal planar cell polarity by modulating actin and microtubule cytoskeleton.

Cell Death Dis 2018 Dec 5;9(12):1183. Epub 2018 Dec 5.

Instituto de Biomedicina (IBIOMED) and Departamento de Biología Molecular, Universidad de León, Campus de Vegazana, 24071, León, Spain.

Planar cell polarity (PCP) and intercellular junctional complexes establish tissue structure and coordinated behaviors across epithelial sheets. In multiciliated ependymal cells, rotational and translational PCP coordinate cilia beating and direct cerebrospinal fluid circulation. Thus, PCP disruption results in ciliopathies and hydrocephalus. Read More

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December 2018
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Incentive Strategies for Low-Carbon Supply Chains with Asymmetric Information of Carbon Reduction Efficiency.

Int J Environ Res Public Health 2018 Dec 4;15(12). Epub 2018 Dec 4.

College of Management and Economics, Tianjin University, Tianjin 300072, China.

Information concerning carbon reduction efficiency is of great significance to supply chain operations. Considering the impact of information asymmetry on the performance of low-carbon supply chain, we therefore analyze a chain system with a single product designer and a single manufacturer. The manufacturer owns information on carbon reduction efficiency, whereas the product designer only knows that the carbon reduction efficiency of the manufacturer is either high or low. Read More

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December 2018

Musculoskeletal Demands in Violin and Viola Playing: A Literature Review.

Med Probl Perform Art 2018 Dec;33(4):265-274

Dep. of Movement and Rehabilitation Science, University of Applied Sciences Osnabrück, Caprivistrasse 30A, 49076 Osnabrück, Germany. Tel +49 541 969 7035.

Background/aims: Research in music medicine has reported incidence rates of musculoskeletal disorders of approx. 70% in instrumental musicians. String players have the highest risk, with rates of performance-related musculoskeletal disorders (PRMDs) of 65% to 88%. Read More

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December 2018

Protein-energy wasting and asymmetric dimethylarginine in peritoneal dialysis patients.

Acta Biochim Pol 2018 Dec 3. Epub 2018 Dec 3.

Department of Nephrology, Transplantology and Internal Medicine, Medical University of Gdansk, Gdańsk, Poland.

Cardiovascular (CVS) morbidity and mortality in the peritoneal dialysis patients (PD) is 10-30-fold higher than in the general population. A relatively low level of adiponectin and a higher level of leptin are important predictors of vascular complications as well as CVS events in PD patients. The asymmetric dimethylarginine (ADMA), an endogenous inhibitor of nitric oxide synthase, is an important risk factor of CVS morbidity and mortality. Read More

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December 2018
2 Reads

Asymmetric dimethylation at histone H3 arginine 2 by PRMT6 in gastric cancer progression.

Carcinogenesis 2018 Dec 3. Epub 2018 Dec 3.

Department of Molecular Oncology, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo, Japan.

Histone modification plays important molecular roles in development and progression of cancers. Dysregulation of histone H3 arginine (R) methylation is still unknown in primary cancer, including gastric cancer (GC). Although PRMT6 contributes to asymmetric dimethylation at H3R2 (H3R2me2as) in cancer cells, its molecular functions are poorly understood in GC. Read More

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December 2018
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A Droplet-Based Microfluidic Approach and Microsphere-PCR Amplification for Single-Stranded DNA Amplicons.

J Vis Exp 2018 Nov 14(141). Epub 2018 Nov 14.

College of Natural Sciences, Chungbuk National University;

Droplet-based microfluidics enable the reliable production of homogeneous microspheres in the microfluidic channel, providing controlled size and morphology of the obtained microsphere. A microsphere copolymerized with an acrydite-DNA probe was successfully fabricated. Different methods such as asymmetric PCR, exonuclease digestion, and isolation on streptavidin-coated magnetic beads can be used to synthesize single-stranded DNA (ssDNA). Read More

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November 2018

Iridium-Catalyzed Enantioselective Allyl-Allyl Cross-Coupling of Racemic Allylic Alcohols with Allylboronates.

Org Lett 2018 Dec 3. Epub 2018 Dec 3.

State Key Laboratory of Phytochemistry and Plant Resources in West China , Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201 , China.

Carreira's iridium-(P, olefin) phosphoramidite-based catalytic system that allows asymmetric allyl-allylboronate cross-coupling with high enantioselectivity is reported. This transformation tolerates a large variety of racemic branched allylic alcohols and allylboronate substrates. The utility of the coupling is demonstrated in a concise catalytic asymmetric synthesis of (-)-preclamol. Read More

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December 2018

Copper(I)-Catalyzed Enantioselective 1,6-Borylation of α,β,γ,δ-Unsaturated Phosphonates.

Org Lett 2018 Dec 3. Epub 2018 Dec 3.

Department of Chemistry and Institute of Basic Science , Sungkyunkwan University , Suwon 16419 , Korea.

Copper(I)-catalyzed asymmetric 1,6-borylation of 1,3-dienylphosphonates was achieved using ( S, S)-Ph-BPE as a chiral ligand. Regio-, stereo-, and enantioselective borylation successfully proceeded to afford phosphonate-containing allylboronates, with high enantioselectivity up to 97% ee. Further applications of the resulting products generated a valuable phosphonate analogue of γ-butyrolactone. Read More

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December 2018

Asymmetric-Layered Tin Thiophosphate: An Emerging 2D Ternary Anode for High Performance Sodium-Ion Full Cell.

ACS Nano 2018 Dec 3. Epub 2018 Dec 3.

The emerging sodium ion batteries (SIBs) are believed to be prospective substitutes of lithium ion batteries (LIBs) for the wide distribution of sodium resources. However, to compensate for the sluggish reaction kinetics and higher intrinsic potential of Na+ than Li+, cost-effective, reliable, and sustainable electrode materials are required to be urgently explored for practical applications. Herein, 2D ternary tin thiophosphate (SnP2S6) nanosheets (~10 nm thickness) grown on graphene (denoted as SPS/G hybrid) are demonstrated as intriguing anodes for SIBs. Read More

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December 2018

Dual Catalytic Switchable Divergent Synthesis: An Asymmetric Visible-light Photocatalytic Approach to Fluorine-containing γ-Keto Acid Frameworks.

J Org Chem 2018 Dec 3. Epub 2018 Dec 3.

Herein, we describe a novel and efficient method for constructing a series of fluorine-containing γ-keto acid derivatives through combining visible-light photoredox catalysis and chiral Lewis acid catalysis. With this dual catalytic strategy, a variety of chiral γ-keto amides containing a gem-difluoroalkyl group and a series of fluorine-containing α,β-unsaturated-γ-keto esters were successfully constructed with high stereoselectivities, respectively. A series of experiments showed that the chemoselectivity of this process was highly dependent on the fluorine reagents besides the Lewis acid catalysts. Read More

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December 2018

Asymmetric dimethylarginine targets MAPK pathway to regulate insulin resistance in liver by activating inflammation factors.

J Cell Biochem 2018 Dec 2. Epub 2018 Dec 2.

Department of Endocrinology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Insulin resistance is associated with impaired glucose uptake and altered protein kinase B (Akt) signaling. Previous studies have suggested asymmetric dimethylarginine (ADMA) and inflammation are two distinguish factors that correlate with insulin resistance (IR). How ADMA and inflammation factors interact and synchronize in the regulation of IR in liver remain to be elucidated. Read More

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December 2018

Asymmetric effective connectivity between primate anterior cingulate and lateral prefrontal cortex revealed by electrical microstimulation.

Brain Struct Funct 2018 Dec 1. Epub 2018 Dec 1.

Centre for Vision Research, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada.

The dorsal anterior cingulate cortex (dACC) and lateral prefrontal cortex (lPFC) of the non-human primate show neural firing correlations and synchronize at theta and beta frequencies during the monitoring and shifting of attention. These functional interactions might be based on synaptic connectivity that is equally efficacious in both directions, but it might be that there are systematic asymmetries in connectivity consistent with reports of more effective inhibition within the dACC than lPFC, or with a preponderance of dACC projections synapsing onto inhibitory neurons in the lPFC. Here, we tested effective dACC-lPFC connectivity in awake monkeys and report systematic asymmetries in the temporal patterning and latencies of effective connectivity as measured using electrical microstimulation. Read More

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December 2018

Macular serpiginous choroiditis - case report.

Rom J Ophthalmol 2018 Jul-Sep;62(3):217-221

Anatomy Department, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.

Serpiginous choroiditis represents an inflammation, often asymmetric, situated at the level of the inner choroid, which is related to the retinal pigment epithelium and the choriocapillaris. It is known as a primarily idiopathic, but there are authors who consider it an autoimmune process. Many times, fundus autofluorescence is the investigation which is guiding the diagnosis, the management, also the follow-up together with the determination of the progressive visual prognosis. Read More

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December 2018

Optical Rehabilitation of a Patient with Keratoconus and Nystagmus.

Med Hypothesis Discov Innov Ophthalmol 2018 ;7(4):183-189

Kentucky College of Optometry, University of Pikeville, Pikeville, KY, USA.

Keratoconus is a progressive corneal disease characterized by bilateral yet usually asymmetric thinning of the cornea with an onset typically in teenage years. While it often presents as an isolated condition, keratoconus may also be associated with many systemic and/or ocular diseases, such as connective tissue and chromosomal disorders. Its association with nystagmus has been described in Leber's congenital amaurosis, where patients also exhibit abnormal pupillary responses, early-onset retinal dystrophy, mental developmental delays, and eventual blindness. Read More

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January 2018
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MRI findings, including diffusion-weighted imaging and apparent diffusion coefficient value, in two cats with nasopharyngeal polyps and one cat with lymphoma.

JFMS Open Rep 2018 Jul-Dec;4(2):2055116918812254. Epub 2018 Nov 27.

Department of Advanced Clinical Medicine, School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka, Japan.

Objectives: Most nasopharyngeal masses in cats are lymphomas or polyps. To our knowledge, there is no report of MRI findings, including diffusion-weighted imaging (DWI) or apparent diffusion coefficient (ADC) values, of nasopharyngeal lymphomas and nasopharyngeal polyps in cats. This study aimed to evaluate the MRI findings of nasopharyngeal lymphomas and nasopharyngeal polyps, including DWI and ADC values. Read More

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November 2018

Asymmetric phase-transfer catalysed β-addition of isoxazolidin-5-ones to MBH carbonates.

Org Chem Front 2018 Oct;5(22):3336-3340

Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstr. 69, 4040 Linz, Austria.

A novel high yielding, and diastereoselective protocol for the synthesis of α-allylated highly functionalised β-amino acid derivatives by adding isoxazolidin-5-ones to MBH carbonates under asymmetric phase-transfer catalysis has been developed. Read More

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October 2018

Accurate Rotational Rest Frequencies for Ammonium Ion Isotopologues.

Astrophys J 2018 Oct;866(2)

I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany.

We report rest frequencies for rotational transitions of the deuterated ammonium isotopologues NHD, and , measured in a cryogenic ion trap machine. For the symmetric tops NHD and one and three transitions are detected, respectively, and five transitions are detected for the asymmetric top . While the lowest frequency transition of NHD was already known in the laboratory and space, this work enables the future radio astronomical detection of the two other isotopologues. Read More

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October 2018

Dissymmetry enhancement in enantioselective synthesis of helical polydiacetylene by application of superchiral light.

Nat Commun 2018 Nov 30;9(1):5117. Epub 2018 Nov 30.

CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China, 230026, Hefei, Anhui, China.

Superchiral light, generated by the interference of two counter-propagating circularly polarized light (CPL) with same frequency, opposite handedness and different intensity, exhibits enhanced dissymmetry in its interaction with chiral molecules, and has the potential for ultrasensitive detection and characterization of chiral molecules. It is anticipated that the enhanced optical dissymmetry in superchiral light (SCL) field may be utilized to promote asymmetric photochemical reactions efficiency. Herein we reported SCL impart greater chiral bias to trigger asymmetric photo-polymerization reaction from initially achiral diacetylene (DA) monomer, and the enhanced optical dissymmetry for whole polydiacetylene (PDA) films could be achieved. Read More

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November 2018

Strategies for Efficient Genome Editing Using CRISPR-Cas9.

Genetics 2018 Nov 30. Epub 2018 Nov 30.

University of California, Berkeley

The targetable DNA endonuclease CRISPR-Cas9 has transformed analysis of biological processes by enabling robust genome editing in model and non-model organisms. Although rules directing Cas9 to its target DNA via a guide RNA are straightforward, wide variation occurs in editing efficiency and repair outcomes for both imprecise error-prone repair and precise templated repair. We found that imprecise and precise DNA repair from double-stranded breaks (DSBs) is asymmetric, favoring repair in one direction. Read More

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November 2018
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Adsorption of poly(vinyl alcohol) on gel permeation chromatography columns depends on the degree of hydrolysis.

J Chromatogr A 2018 Nov 23. Epub 2018 Nov 23.

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China. Electronic address:

Both fully (98%) and partially (88%) hydrolyzed poly(vinyl alcohol) (PVA) are characterized by aqueous gel permeation chromatography (GPC) coupled with multi-angle laser light scattering. Polymer adsorption on hydrophilic GPC columns is observed for partially hydrolyzed PVA but not for fully hydrolyzed PVA, which is driven by the hydrophobic interactions between the residual acetate groups on PVA and the stationary phase. Desorption of these partially hydrolyzed PVA chains from the packing materials is monitored by decay of the light scattering signal. Read More

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November 2018

Differences in fetal growth patterns between twins and singletons.

J Matern Fetal Neonatal Med 2018 Dec 2:1-201. Epub 2018 Dec 2.

b Division of Maternal-Fetal Medicine , Department of Obstetrics and Gynecology , Sunnybrook Health Sciences Center , and University of Toronto , Toronto , Canada.

Objective: Twin fetuses growth is delayed during the third trimester compared to singletons. Whether this phenomenon should be considered a normal physiologic characteristic of twins or a pathologic process inherent to twin pregnancies is currently unclear. Information on the growth rate of the individual fetal biometric indices may provide more insight into the mechanisms underlying these differences between twins and singletons. Read More

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December 2018

Asymmetric Insular Connectomics Revealed by Diffusion Magnetic Resonance Imaging Analysis of Healthy Brain Development.

Brain Connect 2018 Dec 1. Epub 2018 Dec 1.

Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, United States.

The insula has been implicated in playing important roles in various brain functions including consciousness, homeostasis, perception, self-awareness, language processing, and interpersonal experience. Abnormalities of the insula have been observed in patients suffering from addiction, deteriorating language function, anorexia, and emotional dysregulation. We analyzed typical development of insular connections in a large-scale pediatric population using 642 magnetic resonance imaging (MRI) examinations. Read More

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December 2018

Coupled interaction between unsteady flame dynamics and acoustic field in a turbulent combustor.

Chaos 2018 Nov;28(11):113111

Potsdam Institute for Climate Impact Research, P.O. Box 601203, 14412 Potsdam, Germany.

Thermoacoustic instability is a result of the positive feedback between the acoustic pressure and the unsteady heat release rate fluctuations in a combustor. We apply the framework of the synchronization theory to study the coupled behavior of these oscillations during the transition to thermoacoustic instability in a turbulent bluff-body stabilized gas-fired combustor. Furthermore, we characterize this complex behavior using recurrence plots and recurrence networks. Read More

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November 2018

Asymmetric cluster and chimera dynamics in globally coupled systems.

Chaos 2018 Nov;28(11):113119

Grupo de Caos y Sistemas Complejos, Centro de Física Fundamental, Universidad de Los Andes, Mérida, Venezuela.

We investigate the emergence of chimera and cluster states possessing asymmetric dynamics in globally coupled systems, where the trajectories of oscillators belonging to different subpopulations exhibit different dynamical properties. In an asymmetric chimera state, the trajectory of an element in the synchronized subset is stationary or periodic, while that of an oscillator in the desynchronized subset is chaotic. In an asymmetric cluster state, the periods of the trajectories of elements belonging to different clusters are different. Read More

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November 2018

Circumventing Magnetostatic Reciprocity: A Diode for Magnetic Fields.

Phys Rev Lett 2018 Nov;121(21):213903

Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria.

Lorentz reciprocity establishes a stringent relation between electromagnetic fields and their sources. For static magnetic fields, a relation between magnetic sources and fields can be drawn in analogy to the Green's reciprocity principle for electrostatics. So far, the magnetostatic reciprocity principle remains unchallenged and the magnetostatic interaction is assumed to be symmetric (reciprocal). Read More

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November 2018
2 Reads

Enantioselective Aluminum-Free Alkene Hydroarylations via C-H Activation by a Chiral Nickel/JoSPOphos Manifold.

Angew Chem Int Ed Engl 2018 Dec 5. Epub 2018 Dec 5.

Georg-August-Universitaet Goettingen, Institut fuer Organische und Biomolekulare Chemie, Tammannstr. 2, 37077, Goettingen, GERMANY.

Highly enantioselective nickel-catalyzed alkene endo-hydroarylations were accomplished with full selectivity via organometallic C-H activation. The asymmetric assembly of chiral six-membered scaffolds proved viable in the absence of pyrophoric organoaluminum reagents within an unprecedented nickel/JoSPOphos manifold. Read More

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December 2018
1 Read

Influence of dental occlusion on the athletic performance of young elite rowers: a pilot study.

Clinics (Sao Paulo) 2018 Nov 29;73:e453. Epub 2018 Nov 29.

Service d'Odontologie et Chirurgie Buccale, CHU de Rennes, Rennes, France.

Objectives: The present study aimed to assess the influence of dental occlusion on body posture and the competitive performance of young elite rowers.

Method: Dental occlusion disturbance devices were used to simulate dental malocclusions. We assessed the influence of malocclusion on the body balance, paravertebral muscle contraction symmetry, and muscular power of young elite rowers. Read More

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November 2018

AF4-UV-MALS-ICP-MS/MS, spICP-MS and STEM-EDX for the characterization of metal-containing nanoparticles in gas condensates from petroleum hydrocarbon samples.

Anal Chem 2018 Dec 5. Epub 2018 Dec 5.

The coupling of flow field flow fractionation (FlFFF) with ICP-MS/MS for the fractionation and analysis of natural nanoparticles in environmental samples is becoming more popular. However, the applicability of this technique to non-aqueous samples such as gas condensates from petroleum hydrocarbon samples has not been reported yet. In this study, an asymmetric flow-field flow fractionation (AF4) system coupled with UV and MALS detectors has been optimized to perform the fractionation of natural nanoparticles present in a gas condensate sample, using THF as the carrier liquid. Read More

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December 2018
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Access to N-Substituted 2-Pyridones by Catalytic Intermolecular Dearomatization and 1,4-Acyl Transfer.

Angew Chem Int Ed Engl 2018 Dec 5. Epub 2018 Dec 5.

CHINA.

A novel rhodium-catalyzed dearomatization of O-substituted pyridines to access N-substituted 2-pyridones has been developed. Computational study suggested a mechanism involving the formation of a pyridinium ylide followed by an unprecedented 1,4-acyl migratory rearrangement from O-to-C. Furthermore, using chiral dirhodium complexes as the catalyst, the asymmetric transformation has been achieved with excellent enantioselective control. Read More

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December 2018

Recent methods for the synthesis of α-acyloxy ketones.

Org Biomol Chem 2018 Dec 5. Epub 2018 Dec 5.

Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India.

The present review provides a broad description of the methods reported for the synthesis of α-acyloxy ketones and some of their derivatives. α-Acyloxy ketones and their derivatives are vital synthetic intermediates and are ubiquitous as biochemical constituents of living organisms, biologically active natural products and pharmaceuticals. Due to their biological importance, new methods for their synthesis are being continuously developed and documented in the recent past. Read More

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December 2018
2 Reads

AN ALGORITHM FOR PROGNOSIS OF RECURRENT MYOCARDIAL INFARCTION IN TYPE 2 DIABETES MELLITUS PATIENTS FOLLOWING DETERMINATION OF ENDOTHELIAL DYSFUNCTION MARKERS.

Georgian Med News 2018 Oct(283):47-51

Kharkiv National Medical University, Ukraine.

The combination of cardiac pathology and metabolic disorders, namely type 2 diabetes mellitus, is one of the most frequent comorbid pathologies and the main cause of death from cardiovascular complications at an early stage of the disease. Despite the wide range of antithrombogenic measures, prevention of thrombotic complications of acute myocardial infarction remains an urgent problem of cardiology. The study involved examination of 73 patients with acute myocardial infarction with concomitant type 2 diabetes mellitus, who were distributed into clusters according to severity by the main indices of lipid and carbohydrate metabolism using hierarchical analysis. Read More

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October 2018

Characterization of first blastomeres in Patagonian blenny (Eleginops maclovinus) (Perciformes: Eleginopidae).

Zygote 2018 Dec 5:1-6. Epub 2018 Dec 5.

7Universidad de La Frontera,CEBIOR, Chile.

SummaryThere is no information about the characteristics of early cleavage in the Patagonian blennie (Eleginops maclovinus), which can be used as a diagnostic tool for embryo quality. The purpose of this investigation, therefore, was to characterize the first blastomeres of E. maclovinus morphologically. Read More

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December 2018

Novel bimetallic MOF phosphors with an imidazolium cation: structure, phonons, high- pressure phase transitions and optical response.

Dalton Trans 2018 Dec 5. Epub 2018 Dec 5.

Faculty of Physics, Federal University of Pará, Belém, Brazil.

We report the synthesis, crystal structure, phonons and luminescence properties of three novel heterometallic metal organic frameworks (MOFs) with perovskite-like topology of the following formulas: [C3H5N2]Na0.5Cr0.5(HCOO)3 (ImNaCr), [C3H5N2]Na0. Read More

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December 2018

Impact of uncertainties related to noise indicator determination on observed exposure-effect relationship.

Noise Health 2018 Sep-Oct;20(96):212-216

Kirisits Consulting Engineers, Pinkafeld/Vienna, Austria.

Context: Noise indicators are the basis to describe noise exposure-effect relationships. The assessment of these noise indicators in field studies includes various uncertainties, so that the true values differ from the determined values used for establishing curve fits. If the relationship between a noise indicator and its effect is nonlinear, uncertainties of the noise indicator modify the observed exposure-effect relationships. Read More

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December 2018
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