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https://www.readbyqxmd.com/read/30316120/a-solid-state-chemical-reduction-approach-to-synthesize-graphitic-carbon-nitride-with-tunable-nitrogen-defects-for-efficient-visible-light-photocatalytic-hydrogen-evolution
#1
Yizeng Zhang, Junning Gao, Zhiwu Chen
Graphitic carbon nitride with nitrogen defects (g-C3 N4-x ) is prepared by a facile and effective solid-state chemical reduction technique at mild temperature conditions. The cyano groups and nitrogen vacancies, as evidenced by electron paramagnetic resonance (EPR), X-ray photoelectron spectrometer (XPS), Fourier transform infrared spectra (FTIR) and Solid-state 13 C MAS NMR spectra, are controllable via adjusting chemical reduction temperature. Comparing to the pristine g-C3 N4 , the as-prepared g-C3 N4-x shows much enhanced photocatalytic H2 evolution activity under visible-light irradiation...
October 6, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30315849/insulin-adsorption-onto-zinc-oxide-nanoparticle-mediates-conformational-rearrangement-into-amyloid-prone-structure-with-enhanced-cytotoxic-propensity
#2
Shreyasi Asthana, Zaved Hazarika, Parth Sarathi Nayak, Jyoti Roy, Anupam Nath Jha, Bibekanand Mallick, Suman Jha
BACKGROUND: Injection localized amyloidosis is one of the most prevalent disorders in type II diabetes mellitus (TIIDM) patients relying of insulin injections. Previous studies have reported that nanoparticles can play a role in the amyloidogenic process of proteins. Hence, the present study deals with the effect of zinc oxide nanoparticles (ZnONP) on the amyloidogenicity and cytotoxicity of insulin. METHODS: ZnONP is synthesized and characterized using XRD, Zeta Sizer, UV-Visible spectroscope and TEM...
October 10, 2018: Biochimica et biophysica acta. General subjects
https://www.readbyqxmd.com/read/30315713/to-construct-cyclobutanes-by-multicomponent-cascade-reactions-in-homogeneous-solution-via-visible-light-catalysis
#3
Li-Zhu Wu, Tao Lei, Chao Zhou, Xiang-Zhu Wei, Bing Yang, Bin Chen, Chen-Ho Tung
Photo[2+2]cycloaddition of two olefins is general to assemble the core scaffold, cyclobutane, found in numerous bioactive molecules. We report here a new approach to synthesize cyclobutanes via multicomponent cascade reactions by merging aldol reaction and Witting reaction with visible light induced [2+2] cycloaddition, respectively. An array of cyclobutanes with high selectivity have been achieved from commercially available aldehydes, ketones (or phosphorus ylide) and olefins with visible light irradiation of a catalytic amount of Ir(ppy)3 at room temperature...
October 13, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/30315618/an-anisotropic-hydrogel-actuator-enabling-earthworm-like-directed-peristaltic-crawling
#4
Takuzo Aida, Zhifang Sun, Yoshihiro Yamauchi, Fumito Araoka, Youn Soo Kim, Julian Bergueiro, Yasuhiro Ishida, Yasuo Ebina, Takayoshi Sasaki, Takaaki Hikima
Peristaltic crawling, which is the moving mechanism of earthworm-like limbless creatures in narrow spaces, is a challenging target to mimic by using soft materials. Here we report an unprecedented hydrogel actuator that enables not only a peristaltic crawling motion but also reversing its direction. Our cylindrically processed hydrogel contains gold nanoparticles for photothermal conversion, a thermoresponsive polymer network for switching the electrical permittivity of the gel interior, and cofacially oriented 2D electrolytes (titanate nanosheets; TiNSs) to synchronously change their anisotropic electrostatic repulsion...
October 12, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30315555/perceived-social-stigma-in-patients-with-multiple-sclerosis-a-study-from-iran
#5
Soroor Kalantari, Mojgan Karbakhsh, Zahra Kamiab, Zahra Kalantari, Mohammad Ali Sahraian
OBJECTIVES: Social Stigma is potentially a major problem in multiple sclerosis patients which strongly affects the quality of life. The aim of this study was to determine the prevalence of perceived stigma in patients with MS in a sample of Iranian population. METHODS: This cross-sectional study was performed on 305 MS patients who were referred to Iranian Multiple Sclerosis Society in 2014. The main variables were perceived stigma, age, sex, marital status, educational level, occupation, duration of the disease, type of symptoms, disability expanded status scale, family history and economic status...
March 15, 2018: Acta Neurologica Taiwanica
https://www.readbyqxmd.com/read/30315420/microvessel-ultrasound-of-neonatal-brain-parenchyma-feasibility-reproducibility-and-normal-imaging-features-by-superb-microvascular-imaging-smi
#6
Katharina Goeral, Azadeh Hojreh, Gregor Kasprian, Katrin Klebermass-Schrehof, Michael Weber, Christian Mitter, Angelika Berger, Daniela Prayer, Peter C Brugger, Klara Vergesslich-Rothschild, Janina M Patsch
OBJECTIVES: To evaluate the feasibility and reproducibility of superb microvascular imaging (SMI) of the neonatal brain and to describe normal imaging features. METHODS: We performed transcranial ultrasound with SMI in 19 healthy term-born neonates. SMI was done according to a structured examination protocol, using two linear 18 MHz and 14 MHz transducers. Superficial and deep scans were acquired in the coronal and sagittal planes, using the left and right superior frontal gyri as anatomical landmarks...
October 9, 2018: European Radiology
https://www.readbyqxmd.com/read/30315189/near-absolute-polarization-insensitivity-in-grapheme-based-ultra-narrowband-perfect-visible-light-absorber
#7
Deniz Umut Yildirim, Amir Ghobadi, Ekmel Ozbay
Strong light-graphene interaction is essential for the integration of graphene to nanophotonic and optoelectronic devices. The plasmonic response of graphene in terahertz and mid-infrared regions enhances this interaction, and other resonance mechanisms can be adopted in near-infrared and visible ranges to achieve perfect light absorption. However, obtaining near-absolute polarization insensitivity with ultra-narrow absorption bandwidth in the visible and near-infrared regimes remains a challenge. In this regard, we numerically propose a graphene perfect absorber, utilizing the excitation of guided-modes of a dielectric slab waveguide by a novel sub-wavelength dielectric grating structure...
October 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30315141/prognostic-value-of-cancer-stem-cell-markers-in-potentially-malignant-disorders-of-oral-mucosa-a-meta-analysis
#8
Tajindra Singh Saluja, Murtaza Ali, Prabhaker Mishra, Vijay Kumar, Satyendra Kumar Singh
BACKGROUND: Oral squamous cell carcinoma (OSCC) is usually preceded by clinically visible changes on oral mucosa categorised as oral potentially malignant disorders (OPMDs). The progression of OPMD to OSCC is a multistep process which provides an opportunity for early cancer detection and interception. Recent research suggests that cancer stem cells (CSCs) hold the key to unlocking effective strategies to curb initiation and growth of several malignant neoplasms including OSCC. In this meta-analysis we evaluated the efficacy of CSC markers CD133, podoplanin, ALDH1, and others in predicting risk of malignant transformation of OPMDs...
October 12, 2018: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/30314752/intracapsular-infection-after-small-incision-lenticule-extraction
#9
Min Chen, Dewei Li
A 40-year-old man had uneventful small-incision lenticule extraction. Three days later, the uncorrected distance visual acuity was 20/20 and the cornea was clear without intraocular inflammatory in both eyes. At 6 days, the patient presented with a foreign-body sensation in the right eye but with no decrease in vision. Dense infiltration was visible at the inferior nasal corneal rim on slitlamp microscopy. Anterior segment optical coherence tomography showed the lesion in the junction of the capsular bag and the lenticular edge...
October 9, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/30314611/effect-of-previous-photoactivation-of-the-adhesive-system-on-the-color-stability-and-mechanical-properties-of-resin-components-in-ceramic-laminate-veneer-luting
#10
Henrico Badaoui Strazzi Sahyon, Afonso Chimanski, Humberto Naoyuki Yoshimura, Paulo Henrique Dos Santos
STATEMENT OF PROBLEM: The color stability and mechanical properties of luting agents influence the esthetics and longevity of ceramic restorations. However, studies evaluating the color changes and mechanical properties of luting agents under ceramic laminates activated by using different methods are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the effects of different modes of photoactivation on the nanohardness and elastic modulus of resin cements and dental adhesives and on the color stability of ceramic laminate veneers...
October 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/30314501/the-oral-health-status-of-children-with-autism-spectrum-disorder-in-kwazulu-nata-south-africa
#11
Magandhree Naidoo, Shenuka Singh
BACKGROUND: Echoing the sentiments of the Sixty-seventh World Health Assembly of May 2014, mandating the all-inclusive and synchronized efforts for the management of autism spectrum disorder (ASD), the aim of this current study was to investigate the oral health status of children with ASD aged between 7 to 14 years in KwaZulu-Natal, South Africa. METHODS: An investigative cross-sectional quantitative design employing non-probability purposeful sampling was conducted on 149 children with ASD attending special needs schools in KwaZulu-Natal...
October 12, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/30314386/boosted-visible-light-photodegradation-of-methylene-blue-by-v-and-co-co-doped-tio%C3%A2
#12
Tianping Lv, Jianhong Zhao, Mingpeng Chen, Kaiyuan Shen, Dongming Zhang, Jin Zhang, Genlin Zhang, Qingju Liu
In this work, TiO₂ photocatalysts, co-doped with transition metal ions vanadium (V) and cobalt (Co) ((V,Co)⁻TiO₂), were synthesized by the sol⁻gel method. The synthesized photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption and desorption measurement, UV-Vis absorption and photoluminescence spectrum (PL) spectra. The results show that V and Co co-doping has significant effects on sample average crystalline grain size, absorption spectrum, recombination efficiency of photo-induced electron-hole pairs (EHPs), and photocatalytic degradation efficiency of methylene blue (MB)...
October 11, 2018: Materials
https://www.readbyqxmd.com/read/30314330/questions-of-mirror-symmetry-at-the-photoexcited-and-ground-states-of-non-rigid-luminophores-raised-by-circularly-polarized-luminescence-and-circular-dichroism-spectroscopy-part-1-oligofluorenes-oligophenylenes-binaphthyls-and-fused-aromatics
#13
Michiya Fujiki, Julian R Koe, Takashi Mori, Yoshihiro Kimura
We report experimental tests of whether non-rigid, π -conjugated luminophores in the photoexcited ( S ₁) and ground ( S ₀) states dissolved in achiral liquids are mirror symmetrical by means of circularly polarized luminescence (CPL) and circular dichroism (CD) spectroscopy. Herein, we chose ten oligofluorenes, eleven linear/cyclic oligo- p -arylenes, three binaphthyls and five fused aromatics, substituted with alkyl, alkoxy, phenyl and phenylethynyl groups and also with no substituents. Without exception, all these non-rigid luminophores showed negative-sign CPL signals in the UV-visible region, suggesting temporal generation of energetically non-equivalent non-mirror image structures as far-from equilibrium open-flow systems at the S₁ state...
October 11, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30314306/visualization-of-a-dinoflagellate-infecting-virus-hcdnav-and-its-infection-process
#14
Yoshihito Takano, Yuji Tomaru, Keizo Nagasaki
HcDNAV (a type species of Genus Dinodnavirus ) is a large double-stranded DNA virus, which lytically infects the bloom-forming marine microalga Heterocapsa circularisquama Horiguchi (Dinophyceae). In the present study, detailed observation of the HcDNAV particle and its infection process was conducted via field emission scanning electron microscopy (FE-SEM) and epifluorescence microscopy (EFM). Each five-fold vertex of the icosahedral virion was decorated with a protrusion, which may be related to the entry process of HcDNAV into the host...
October 11, 2018: Viruses
https://www.readbyqxmd.com/read/30314293/deprotonation-mechanism-of-methyl-gallate-uv-spectroscopic-and-computational-studies
#15
Liangliang Zhang, Yuchen Liu, Yongmei Wang
In the present paper, methyl gallate (MeG), a simple polyphenol and also the monomer of hydrolysable tannins, was selected to study the deprotonation process for the hydroxyls of the galloyl group by the combined use of spectroscopic measurements and quantum chemical calculations. The results of quantum chemical calculations show that the deprotonated form of methyl gallate undergoes the para-quinoid localization in the benzene ring, compared with free methyl gallate. The predicted spectra obtained from the free and deprotonated methyl gallate models are in agreement with the experimental UV-visible (UV-vis) absorption spectra...
October 11, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/30314237/a-new-genus-and-species-of-congrid-eel-from-the-philippines-anguillliformes-congridae-bathymyrinae
#16
David G Smith
Rostroconger macrouriceps sp. nov. is described from a single specimen collected off the east coast of Luzon, Philippines. It is a member of the subfamily Bathymyrinae, differing from all others in the presence of a bony rostrum extending from the anterior end of the snout. The posterior nostril opens into a slit in the upper lip and is not visible externally. The head pores are reduced in size and number; only three pores are present in the infraorbital canal, four in the supraorbital canal, and none in the preopercular or supratemporal canals...
July 31, 2018: Zootaxa
https://www.readbyqxmd.com/read/30313872/a-new-species-of-phrynopus-from-the-northeastern-andes-of-peru-its-phylogenetic-position-and-notes-on-the-relationships-of-holoadeninae-anura-craugastoridae
#17
Pablo J Venegas, Andy C Barboza, Ignacio de la Riva, JosÉ M Padial
We report the discovery of a geographically disjunct and morphologically distinctive species of direct-developing frog of the genus Phrynopus (Phrynopus mariellaleo sp. nov.) that changes considerably our understanding of the distribution of species in this Andean genus. The type locality lies on a subcordillera (Cerro de Campanario area) of the extreme northeastern portion of the Cordillera Central of Peru, on the headwaters of the Mayo River, Amazonas department, at 2575 m asl (6°6'42.9''S, 77°26'24''W)...
July 19, 2018: Zootaxa
https://www.readbyqxmd.com/read/30313669/the-genus-metaporcelaimus-lordello-1965-nematoda-dorylaimida-aporcelaimidae-in-ukraine-description-of-one-known-and-two-new-species-without-hiatus
#18
Liubomyr Krainer, Andrij Susulovsky, Reyes PeÑa-Santiago
One known (M. romanicus) and two new species of the genus Metaporcelaimus, collected in natural and semi-natural habitats of Ukraine, are described and illustrated. Metaporcelaimus concinnus sp. n. is characterized by its 3.09-4.58 mm long body, lip region 16.5-19.5 µm broad and visibly wider than the adjacent body, odontostyle 17-19 µm long, neck 745-865 µm long, pharyngeal expansion occupying 62-66% of total neck length, uterus tripartite and 3.9-5.7 times the corresponding body diameter, vulva longitudinal (V = 49-53%), tail conical (44-54 µm, c = 67-94, c' = 1...
October 8, 2018: Zootaxa
https://www.readbyqxmd.com/read/30313610/morphology-and-taxonomy-of-the-orb-weaving-spider-genus-mecynogea-and-a-peculiar-species-of-argiope-araneae-araneidae
#19
Pedro H Martins, Adalberto J Santos
The spider genus Mecynogea comprises nine species distributed predominantly in the Neotropics. Although the genus has been revised recently, several aspects of its taxonomy and morphology are still unresolved. In this paper, Mecynogea infelix (Soares Camargo, 1948) is removed from the synonymy of Mecynogea bigibba Simon, 1903 and redescribed. Mecynogea chavona Levi, 1997 is considered a junior synonym of M. infelix. The male of Mecynogea buique Levi, 1997 is described and illustrated for the first time. The internal female genitalia of M...
May 1, 2018: Zootaxa
https://www.readbyqxmd.com/read/30313327/a-new-species-of-myxozoa-in-the-skeletal-striated-musculature-of-rhamdia-quelen-quoy-gaimard-siluriforme-pimelodidae-amazonian-fish-maraj%C3%A3-island-brazil
#20
Jacqueline Abrunhosa, Jose L Sindeaux-Neto, Sidney Santos, Igor Hamoy, Edilson Matos
A new myxozoan was found parasitizing the freshwater catfish, Rhamdia quelen (Quoy Gaimard), in the Marajó island, Amazon region, Brazil. The new species is described based on the results of morphological and molecular analyses. The parasite is approximately 1.5 mm in diameter and develops in the musculature of the host in the form of spherical, whitish cysts, which are visible macroscopically between the epaxial and hypaxial layers. When ruptured, these cysts produced ellipsoidal spores with a mean length of 11...
September 17, 2018: Zootaxa
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