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Xiaoli Sun, Baitao Zhang, Yanlu Li, Xingyun Luo, Guoru Li, Yanxue Chen, Chengqian Zhang, Jingliang He
For van der Waals (vdW) heterostructures, optical and electrical properties, (e.g., saturable absorption and carrier dynamics) are strongly modulated by interlayer coupling, which may be due to effective charge transfer and band structure recombination. General theoretical studies have shown that the complementary properties of graphene and MoS2 enable the graphene/MoS2 (G/MoS2) heterostructure to be used as an important building block for various optoelectronic devices. Here, density functional theory was used to calculate the work function values of G/MoS2 with different thickness of MoS2, and its relaxation dynamic mechanism was illustrated...
October 17, 2018: ACS Nano
Christopher K Giardina, Kevin D Brown, Oliver F Adunka, Craig A Buchman, Kendall A Hutson, Harold C Pillsbury, Douglas C Fitzpatrick
OBJECTIVES: Electrocochleography (ECochG) obtained through a cochlear implant (CI) is increasingly being tested as an intraoperative monitor during implantation with the goal of reducing surgical trauma. Reducing trauma should aid in preserving residual hearing and improve speech perception overall. The purpose of this study was to characterize intracochlear ECochG responses throughout insertion in a range of array types and, when applicable, relate these measures to hearing preservation...
October 17, 2018: Ear and Hearing
Majid Esmaeilzadeh, Mahmoud Sadeghi, Hans E Heissler, Roland Galmbacher, Ali Majlesara, Shadi Al-Afif, Arianeb Mehrabi
BACKGROUND: Experimental animal research has been pivotal in developing clinical kidney transplantation (KTx). One donor-associated risk factor with negative affect of transplantation outcome is brain death (BD). Many rat models for BD and KTx have been developed in the last decade, but no surgical guidelines have been developed for these models. Here, we describe a surgical technique for BD induction and the cuff technique for experimental KTx in rats. METHODS: After intubation and mechanically ventilation of sixteen healthy adult male Sprague-Dawley rats were induction of BD performed...
October 18, 2018: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
Alexander Ya Zherebker, Evgeny Shirshin, Oleg N Kharybin, Yury I Kostyukevich, Alexey S Kononikhin, Andrey I Konstantinov, Dmitry S Volkov, Vitaly A Roznyatovsky, Yuri K Grishin, Irina V Perminova, Eugene N Nikolaev
Here we report on sequential solid phase extraction of leonardite hymatomelanic acid (CHM) on nonionic sorbent at four steadily lowered pH values: 7, 5, 3, and 2 yielding fractions with different acidic properties. Using NMR spectroscopy and ultra-high resolution mass-spectrometry we revealed a gradual shift of dominating scaffolds in the fractions of CHM from reduced saturated to oxidized aromatic compounds. An increase in the average aromaticity of the CHM fractions was accompanied by a red shift in fluorescence spectra...
October 18, 2018: Journal of Agricultural and Food Chemistry
Chunghee Joo, Joo-Won Min, Giyong Noh, Jaeho Seo
INTRODUCTION: Aortic dissection is a very rare but life-threatening condition associated with a high mortality. Unexpected sudden cardiac death due to aortic rupture following laparoscopic appendectomy is very rare and may be difficult to diagnose. However, early diagnosis of aortic dissection is essential for the timely treatment and outcome of aortic dissection. CASE PRESENTATION: A 50-year-old man underwent a laparoscopic appendectomy. Postoperatively, the patient complained of dyspnea and chest pain...
October 2018: Medicine (Baltimore)
Pooja Dewan, Anupriya Dixit, Sunil Gomber, Mrinalini Kotru, Basu D Banerjee, Vipin Tyagi, Rajeev K Malhotra
Bone marrow iron estimation remains the gold standard for diagnosing iron-deficiency anemia (IDA); serum ferritin, total iron-binding capacity, and transferrin saturation are routinely used as surrogate markers of IDA. However, these tests are marred by problems like poor specificity and sensitivity. Recently, hepcidin, a protein hormone synthesized in the liver and excreted in urine, has been shown to be related to iron status. We estimated the serum and urinary hepcidin levels in healthy children aged 6 to 60 months with (n=30) and without IDA (n=30)...
October 16, 2018: Journal of Pediatric Hematology/oncology
Jingfeng Guo, Tieshan Cao, Congqian Cheng, Xianming Meng, Jie Zhao
The magnetism and microstructure of Cr25Ni35Nb and Cr35Ni45Nb alloy tubes after 5 years of service were investigated in this paper. The saturation magnetization of the Cr25Ni35Nb alloy tube in the thickness direction is more than 20 emu/g, and the tube becomes ferromagnetic. The inner and outer walls of Cr35Ni45Nb alloy tubes also become ferromagnetic. But the saturation magnetization of the Cr35Ni45Nb alloy tubes approaches to zero in the center zone. The primary carbides M7C3 and NbC are changed into M23C6 and G phase at the outer region of the furnace tube...
October 2018: Microscopy and Microanalysis
Peter von Philipsborn, Jan Marcel Stratil, Thomas Leonhard Heise, Rüdiger Landgraf, Hans Hauner, Eva Annette Rehfuess
OBJECTIVE: To analyse the scope and content of the nutrition pledge announced by Lidl. DESIGN: We applied the approach recommended by the private-sector module of the INFORMAS (International Network for Food and Obesity Research, Monitoring and Action Support) food environment monitoring framework and qualitative content analysis to Lidl's nutrition pledge. SETTING: Global. SUBJECTS: The nutrition pledge of Lidl, Europe's largest food retailer...
October 18, 2018: Public Health Nutrition
Zhongliang Zu
Recently, a new nuclear Overhauser enhancement (NOE)-mediated saturation transfer effect at around -1.6 ppm from water, termed NOE(-1.6), was reported to show hypointense signals in brain tumors. Similar to chemical exchange saturation transfer or magnetization transfer (MT) effects, which depend on the solute pool concentration, the exchange/coupling rate, the solute transverse relaxation rate, etc., the NOE(-1.6) effect should also depend on these factors. Since the exchange rate is relevant to tissue pH, and the coupling rate and the solute transverse relaxation rate are relevant to the motional property of the coupled molecules, further studies to quantify the contribution from only the exchange/coupling rate and the solute transverse relaxation rate are always interesting...
October 18, 2018: NMR in Biomedicine
Baohua Zhu, Fangfang Wang, Peng Li, Chong Wang, Yuzong Gu
Surface oxygen-containing defects of graphene nanosheets (G NSs) are important for the nonlinear optical (NLO) properties in optoelectric devices. G NSs with different surface oxygen-containing defects are successfully tuned by a chemical reduction process, and are characterized by several experimental measurements of morphology and structure and by spectroscopy. Their NLO properties are measured with the Z-scan technique and the NLO transmission method using a 30 picosecond single-pulse laser source at 532 nm wavelength...
October 18, 2018: Physical Chemistry Chemical Physics: PCCP
Dimitry Y Sorokin, Enzo Messina, Violetta La Cono, Manuel Ferrer, Sergio Ciordia, Maria C Mena, Stepan V Toshchakov, Peter N Golyshin, Michail M Yakimov
The ubiquity of strictly anaerobic sulfur-respiring haloarchaea in hypersaline systems with circumneutral pH has shaken a traditional concept of this group as predominantly aerobic heterotrophs. Here, we demonstrated that this functional group of haloarchaea also has its representatives in hypersaline alkaline lakes. Sediments from various hypersaline soda lakes showed high activity of sulfur reduction only partially inhibited by antibiotics. Eight pure cultures of sulfur-reducing natronoarchaea were isolated from such sediments using formate and butyrate as electron donors and sulfur as an electron acceptor...
2018: Frontiers in Microbiology
Mary Adjepong, Raghav Jain, C Austin Pickens, William Appaw, Jenifer I Fenton
The purpose of this study was to identify locally available foods that can be utilized by Northern Ghanaians to improve child growth status. An assortment of seeds, nuts and oils were collected from a local market, packaged in plastic containers, and shipped to the US for all analyses. Fatty acids (FAs) were extracted and derivatized to FA methyl esters prior to quantification by GC/MS. ANOVA were conducted on FA concentrations and Tukey's post hoc test was used to compare FA content. Food grade oils, particularly palm oil and shea butter, contained higher saturated and monounsaturated FAs than seeds or nuts...
November 2018: Journal of Food Science and Technology
Ali Turan
This study was conducted to determine the effects of hazelnut drying machine (DM1 and DM2 ; at 45 °C and 50 °C, respectively) and sun-drying (concrete ground and grass ground) methods on the chemical properties of Tombul, Palaz, and Ordu Levant hazelnuts. For this purpose, protein, lipid and moisture content, water activity, free fatty acid (FFA), peroxide value (PV), rancimat value (RV) and fatty acid composition were analyzed. As expected, it was observed that monounsaturated fatty acid (MUFA) was the main fatty acid group (81...
November 2018: Journal of Food Science and Technology
Adriel N Dias, Advanio I Siqueira-Silva, João P Souza, Kacilda N Kuki, Eduardo G Pereira
The photosynthetic adjustments of macaw palm (Acrocomia aculeata) were evaluated in 30-day-old seedlings exposed to high and low light environments, and sudden transference from low to high light and comparisons were made with the hardening protocol used in nurseries. Furthermore, we evaluated the responses to long-term exposure (265 days) to high and low light environments. Macaw palm seedlings exhibited an efficient mechanism that maximized light capture under scarce conditions, and dissipated excess energy to avoid damaging to the photosystem II under high light...
October 17, 2018: Scientific Reports
Mika Nagaoka, Ayumi Goda, Kaori Takeuchi, Hanako Kikuchi, Mayumi Finger, Takumi Inami, Kyoko Soejima, Toru Satoh
BACKGROUND: Sleep apnea (SA) can cause repeated nocturnal arterial oxygen desaturation and result in acute increase in pulmonary arterial pressure (PAP). The presence of SA is associated with a poor prognosis in patients with chronic left-sided heart failure, but little is known for patients with pulmonary arterial hypertension (PAH). Methods and Results: We enrolled 151 patients with PAH (44±16 years old, male/female=37/114). They were all in the Nice Classification group 1 (idiopathic PAH/associated PAH=52/48%, mean PAP of 46±16 mmHg)...
October 16, 2018: Circulation Journal: Official Journal of the Japanese Circulation Society
Yukiko Okami, Hirotsugu Ueshima, Yasuyuki Nakamura, Keiko Kondo, Aya Kadota, Nagako Okuda, Tomonori Okamura, Katsuyuki Miura
BACKGROUND: In recent years, individuals with high serum total cholesterol (TC) have been more likely to modify their diet by reducing their intake of dietary lipids. The aim of this study was to investigate time-related changes in the relationships between the Keys score, dietary lipids, and TC between 1980 and 2010 in representative Japanese populations. Methods and Results: We used 3 cross-sectional cohort studies conducted among Japanese representative populations in 1980, 1990, and 2010 (NIPPON DATA80/90/2010) for the analyses...
October 18, 2018: Circulation Journal: Official Journal of the Japanese Circulation Society
Soumi Das, Kakali Ghosh, Avijit Hazra, Chaitali Sen, Anupam Goswami
Context: Hyperglycemia has been found to occur during myocardial infarction and cardiac surgery even in nondiabetic patients. These being essentially stressful processes associated with hypoperfusion, we decided to find a possible relationship between the occurrence of global tissue hypoperfusion (GTH) and elevated blood glucose level in adult nondiabetic patients undergoing elective off-pump coronary artery bypass grafting (CABG). Aims: This study aims to observe for the occurrence of global tissue hypoperfusion and its effect on blood glucose level and whether raised blood glucose level can be used as a marker for GTH...
October 2018: Annals of Cardiac Anaesthesia
Pustika Amalia Wahidiyat, Stephen Diah Iskandar, Damayanti Sekarsari
BACKGROUND: routine blood transfusion in transfusion-dependent-thalassemia (TDT) causes iron accumulation in various organ. Serum markers of iron overload, serum ferritin and transferrin saturation, are sensitive but not specific. MRI T2-star (T2*) is valuable for detecting iron level in organs. This study aimed to explore the degree of iron overload in various organs, iron deposition difference between children and adults, also its correlation with serum marker of iron overload. METHODS: this was a cross-sectional study of TDT patients who had been evaluated by MRI T2* examination in Cipto Mangunkusumo Hospital from 2014 to 2018...
July 2018: Acta Medica Indonesiana
Bianca N M Silva, Policarpo A Sales, Alvaro J Romanha, Silvane M F Murta, Camilo H S Lima, Magaly G Albuquerque, Eliane D'Elia, Jose G de Aquino, Vitor F Ferreira, Fernando C Silva, Angelo C Pinto, Barbara V Silva
BACKGROUND: Chagas disease, also known as American trypanosomiasis, is classified as one of the 17 most important neglected diseases by the World Health Organization. The only drugs with proven efficacy against Chagas disease are benznidazole and nifurtimox, however both show adverse effects, poor clinical efficacy,and the development of resistance. For these reasons, the search for new effective chemical entities is a challenge to research groups and the pharmaceutical industry. OBJECTIVE: Synthesis and antitrypanosomal activities of a series of thiosemicarbazones and semicarbazones containing the 1,2,3-1H triazole isatin scaffold...
September 12, 2018: Medicinal Chemistry
Christopher Teskey, Pauline Adler, Carlos Goncalves, Nuno Maulide
We report a method for the selective a,b-dehydrogenation of amides in the presence of other carbonyl moieties under mild conditions. Our strategy relies on electrophilic activation coupled to in situ selective selenium-mediated dehydrogenation. The a,b-unsaturated products are obtained in moderate to excellent yields and their synthetic versatility is demonstrated by a range of transformations. Mechanistic experiments suggest formation of an electrophilic Se(IV) species.
October 17, 2018: Angewandte Chemie
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