bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hybrid Perovskites: Effective Crystal Growth for Optoelectronic Applications
Authors: Jeon Taewoo , Kim Sung Jin , Yoon Jisun , Byun Jinwoo , Hong Hye Rim , Lee Tae‐Woo , Kim Ji‐Seon , Shin Byungha , Kim Sang Ouk 
Published: May 2017

AbstractOutstanding material properties of organic‐inorganic hybrid perovskites have triggered a new insight into the next‐generation solar cells. Beyond solar cells, a wide range of controllable properties of hybrid perovskites, particularly depending on crystal growth conditions, enables versatile high‐performance optoelectronic devices such as light‐emitting diodes, photodetectors, and lasers. This article highlights recent progress in the crystallization strategies of organic–inorganic hybrid perovskites for use as effective light harvesters or light emitters. Fundamental background on perovskite crystalline structures and relevant optoelectronic properties such as optical band‐gap, electron‐hole behavior, and energy band alignment are given. A detailed overview of the effective crystallization methods for perovskites, including thermal treatment, additives, solvent mediator, laser irradiation, nanostructure, and crystal dimensionalityis reported offering a comprehensive correlation among perovskite processing conditions, crystalline morphology, and relevant device performance. Finally, future research directions to overcome current practical bottlenecks and move towards reliable high performance perovskite optoelectronic applications are proposed.
Intramolecular Pictet–Spengler Reaction of Cyclic Iminium ions: A Novel Access to Benzo[1,4]oxazepine‐Fused Tetrahydroisoquinoline and Tetrahydro‐β‐carboline Analogues
Authors: Unnava Ramanjaneyulu , Sahu Archana K. , Saikia Anil K. 
Published: May 2017

AbstractA simple and efficient approach has been developed for the synthesis of benzo[1,4]oxazepino‐fused tetrahydroisoquinoline and tetrahydro‐β‐carboline derivatives via one‐pot cascade reaction sequence. This reaction involves the intramolecular Pictet–Spengler reaction of cyclic iminium ions, which were generated in situ via trifluoroacetic acid (TFA)‐mediated deprotection of an acetal derived from β‐arylethylamines and 2‐(2,2‐diethoxyethoxy)benzaldehyde. All reactions produced a novel library of complex fused polyheterocyclic compounds in good to excellent yields.
Silver Films with Hierarchical Chirality
Authors: Ma Liguo , Cao Yuanyuan , Duan Yingying , Han Lu , Che Shunai 
Published: May 2017

AbstractPhysical fabrication of chiral metallic films usually results in singular or large‐sized chirality, restricting the optical asymmetric responses to long electromagnetic wavelengths. The chiral molecule‐induced formation of silver films prepared chemically on a copper substrate through a redox reaction is presented. Three levels of chirality were identified: primary twisted nanoflakes with atomic crystal lattices, secondary helical stacking of these nanoflakes to form nanoplates, and tertiary micrometer‐sized circinates consisting of chiral arranged nanoplates. The chiral Ag films exhibited multiple plasmonic absorption‐ and scattering‐based optical activities at UV/Vis wavelengths based on their hierarchical chirality. The Ag films showed chiral selectivity for amino acids in catalytic electrochemical reactions, which originated from their primary atomic crystal lattices.
Highly Luminescent and Ultrastable CsPbBr3 Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith
Authors: Li Zhichun , Kong Long , Huang Shouqiang , Li Liang 
Published: May 2017

AbstractWe successfully prepared QDs incorporated into a silica/alumina monolith (QDs‐SAM) by a simple sol–gel reaction of an Al–Si single precursor with CsPbBr3 QDs blended in toluene solution, without adding water and catalyst. The resultant transparent monolith exhibits high photoluminescence quantum yields (PLQY) up to 90 %, and good photostability under strong illumination of blue light for 300 h. We show that the preliminary ligand exchange of didodecyl dimethyl ammonium bromide (DDAB) was very important to protect CsPbBr3 QDs from surface damages during the sol–gel reaction, which not only allowed us to maintain the original optical properties of CsPbBr3 QDs but also prevented the aggregation of QDs and made the monolith transparent. The CsPbBr3 QDs‐SAM in powder form was easily mixed into the resins and applied as color‐converting layer with curing on blue light‐emitting diodes (LED). The material showed a high luminous efficacy of 80 lm W−1 and a narrow emission with a full width at half maximum (FWHM) of 25 nm.
Steuerung der Produktverteilung und der Mechanismen der thermischen Aktivierung von Methan durch Ligandeneffekte und elektrische Felder
Authors: Yue Lei , Li Jilai , Zhou Shaodong , Sun Xiaoyan , Schlangen Maria , Shaik Sason , Schwarz Helmut 
Published: May 2017

AbstractDie Bindung von Acetonitril an zweiatomiges [ZnO].+ führt bei der thermischen Aktivierung von Methan in der Gasphase zu einem unerwarteten Wechsel der Reaktionsmechanismen und einer Umverteilung der Produkte. Theoretischen Studien zufolge spielt die starke Metall‐Kohlenstoff‐Bindung bei der ligandenfreien [ZnO].+‐Spezies eine bedeutende Rolle für die Rückbindung des CH3.‐Radikals an das Metallzentrum; hierdurch wird die kompetitive Bildung von CH3., OH. und CH3OH ermöglicht. Diese Wechselwirkung wird durch einen CH3CN‐Liganden drastisch reduziert, was mechanistisch zu einem Wechsel von der bei [ZnO].+/CH4 dominierenden protonengekoppelten Elektronenübertragung zum klassischen Wasserstoffatomtransfer, gefolgt von der ausschließlichen Abspaltung von CH3., führt. Dieser Ligandeneffekt kann durch das gerichtete externe elektrische Feld einer negativen Punktladung gut modelliert werden.
Amorphous silicon carbonitride thin‐film coatings produced by remote nitrogen microwave plasma chemical vapour deposition using organosilicon precursor
Authors: Wrobel A.M. , Uznanski P. , Walkiewicz‐Pietrzykowska A. , Jankowski K. 
Published: May 2017

Amorphous silicon carbonitride (a‐SiCN) films were produced by remote nitrogen plasma chemical vapour deposition (RP‐CVD) from bis(dimethylamino)methylsilane precursor. The effect of substrate temperature (TS) on the kinetics of RP‐CVD, chemical structure, surface morphology and some properties of the resulting films is reported. The TS dependence of film growth rate implies that RP‐CVD is an adsorption‐controlled process. Fourier transform infrared spectroscopic examination revealed that an increase in TS from 30 to 400°C involves the elimination of organic moieties from the film and the formation of Si─C and Si─N network structure. The films were characterized in terms of their surface roughness and basic physical and optical properties, such as density and refractive index, respectively. Reasonably good relationships between the structural parameters represented by relative integrated intensity of infrared absorption bands from the Si─C and Si─N bonds (controlled by TS) and the film properties are determined. Due to their small surface roughness, high density and high refractive index, the a‐SiCN films produced at TS ≥ 350°C would seem to be useful protective coatings for metals and optical devices.
Effects of temperature and strain rate on the tensile behavior of polypropylene composites insulator coatings used in offshore deepwater pipelines
Authors: Vipulanandan C. , Ahossin Guezo Y. J. 
Published: May 2017

ABSTRACTPolypropylene (PP) composites are being increasingly used as thermal insulation coatings in both onshore and offshore pipelines. In this study, the direct tensile behavior of pure PP, PP with glass microsphere filler, and PP with 65% glass filler were investigated at 22, 60, and 90 °C temperatures at various strain rates from 0.003/min to 0.300/min. Fourier transform infrared spectroscopy and scanning electron microscope studies were used to characterize the materials. Stress–strain relationships of the materials were nonlinear in the elastic and inelastic domains. Addition of glass fiber to the PP increased the elastic modulus, but the yield strength and yield strain were reduced along with the ductility. Based on the experimental results, constitutive models coupling the strain rate and temperature have been developed to predict the yield strength, the initial elastic modulus and secant modulus at yield for the PP composites. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45209.
Polypropylene/multiwall carbon nanotubes nanocomposites: Nanoindentation, dynamic mechanical, and electrical properties
Authors: Chafidz Achmad , Rengga Wara Dyah Pita , Khan Rawaiz , Kaavessina Mujtahid , Almutlaq Abdulaziz M. , Almasry Waheed A. , Ajbar Abdelhamid 
Published: May 2017

ABSTRACTPolypropylene (PP)/Multiwall carbon nanotubes (MWCNTs) nanocomposites were fabricated via melt compounding that utilizes a corotating twin‐screw extruder. Two commercially available MWCNTs, Baytubes C150P and C70P, were incorporated into PP matrix at concentration of 3 wt %. The nanocomposites samples were analyzed using scanning electron microscopy, dynamic mechanical analysis (DMA), nanoindentation test, and picoammeter. It was found that both MWCNTs types were well distributed and dispersed in the PP matrix and no agglomeration of MWCNTs was observed. The DMA analysis results showed that the incorporation of MWCNTs enhanced the storage modulus and thermal stability of the PP matrix. Whereas, nanoindentation creep results showed that the creep rate and displacement of the PP/MWCNTs nanocomposites was lower than the neat PP, in which C70P < C150P < PP. The reduction of creep rate and creep displacement was associated to the improvement of creep resistance. There were also improvements on hardness and stiffness of the nanocomposites. Additionally, the electrical resistivity of the neat PP decreased with the incorporation of MWCNTs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45293.
Coccygeal body revisited: An immunohistochemical study using donated elderly cadavers
Authors: Jin Zhe Wu , Cho Kwang Ho , Jang Hyung Suk , Murakami Gen , Rodríguez‐Vázquez Jose Francisco , Yamamoto Masahito , Abe Shin‐Ichi 
Published: May 2017

ABSTRACTTo describe the normal anatomy and histology of the adult coccygeal body (CB) and to discuss about the origin and function, using immunohistochemistry, we examined 29 CBs found in 32 elderly donated cadavers without macroscopic pathology in the pelvis. The CB was usually located in or near the anococcygeal ligaments. It was almost always composed of multiple masses or nodules of round glomus cells (smooth muscle actin or SMA++). However, the CB sometimes contained abundant dilated veins with scattered glomus cells. Thus, the CBs varied from the glomus cell nodule‐dominant type, through an intermediate morphology with a mixture of nodules and veins, to the vein‐dominant type. Each glomus cell mass was surrounded by abundant sympathetic nerves. In all specimens, we found multiple abnormal arteries, each of which carried a glomus‐like cell layer around the almost ‐obliterated vascular lumen; as well as an SMA‐negative thick arterial wall containing abundant sympathetic nerves. The ligaments around the CB are known to be under strong mechanical stress from the pelvic floor. We considered abnormal arteries containing the unique internal layer as an intermediate between a normal muscular artery and a glomus cell mass of CB. Under long‐termed mechanical stress, a muscular artery seems to lose smooth muscles with increased sympathetic nerve fibers, to compensate for the lack of muscle function. Taken together with fetal morphology (our recent report), some or most of the CBs might not be an arteriovenous shunt but a result of stress‐induced acquired transformation of pericytes. Anat Rec, 2017. © 2017 Wiley Periodicals, Inc. Anat Rec, 300:1826–1837, 2017. © 2017 Wiley Periodicals, Inc.
Classic Galactosemia: Study on the Late Prenatal Development of GALT Specific Activity in a Sheep Model
Authors: Coelho Ana I. , Bierau Jörgen , Lindhout Martijn , Achten Jelle , Kramer Boris W. , Rubio‐Gozalbo M. Estela 
Published: May 2017

ABSTRACTClassic galactosemia results from deficient activity of galactose‐1‐phosphate uridylyltransferase (GALT), a key enzyme of galactose metabolism. Despite early diagnosis and early postnatal therapeutic intervention, patients still develop neurologic and fertility impairments. Prenatal developmental toxicity has been hypothesized as a determinant factor of disease. In order to shed light on the importance of prenatal GALT activity, several studies have examined GALT activity throughout development. GALT was shown to increase with gestational age in 7‐28 weeks human fetuses; later stages were not investigated. Prenatal studies in animals focused exclusively on brain and hepatic GALT activity. In this study, we aim to examine GALT specific activity in late prenatal and adult stages, using a sheep model. Galactosemia acute target‐organs—liver, small intestine and kidney—had the highest late prenatal activity, whereas the chronic target‐organs—brain and ovary—did not exhibit a noticeable pre‐ or postnatal different activity compared with nontarget organs. This is the first study on GALT specific activity in the late prenatal stage for a wide variety of organs. Our findings suggest that GALT activity cannot be the sole pathogenic factor accounting for galactosemia long‐term complications, and that some organs/cells might have a greater susceptibility to galactose toxicity. Anat Rec, 300:1570–1575, 2017. © 2017 Wiley Periodicals, Inc.
Dynamical Analysis of a Tri‐Neuron Fractional Network
Authors: Huang Cheng‐dai , Cao Jin‐de , Xiao Min , Alsaedi Ahmed , Alsaadi Fuad E. , Hayat Tasawar 
Published: May 2017

AbstractThe present paper concerns with the dynamics of a fractional neural network involving three neurons. Firstly, the bifurcation point is identified for which Hopf bifurcations may occur by taking the system parameter as a bifurcation parameter via the stability analysis of fractional systems. It is indicated that the system parameter can significantly affect the dynamical properties of such network. Secondly, the impact of the order on the bifurcation point is carefully examined. It is found that the occurrence of bifurcation is delayed as the order increases as long as the other system parameters are established. Finally, a numerical example is exploited to verify the efficiency of theoretical results.
Tryptase expression as a prognostic marker in patients with resected gastric cancer
Authors: Lin C , Liu H , Zhang H , Cao Y , Li R , Wu S , Li H , He H , Xu J , Sun Y 
Published: May 2017

Abstract

Background
Mast cells play important roles in the progression of various malignancies, but their prognostic value in gastric cancer is unknown. Tryptase expression, as an indicator of mast cell activity, was therefore evaluated to see whether this could be incorporated usefully into a prognostic nomogram after surgery in patients with gastric cancer.

Methods
Tissue microarrays from patients with gastric cancer were created from formalin-fixed, paraffin-embedded resection specimens. Tryptase density was assessed by immunohistochemistry, and the association between tryptase expression and prognosis was evaluated. Semiquantitative scoring was devised to determine an optimal cut-off value that correlated with survival. A prognostic nomogram was then developed incorporating tryptase expression scores along with other variables known to be related to survival.

Results
Tissue microarrays were generated from 419 patients having surgery for gastric cancer. Increased tryptase expression was associated with better overall and recurrence-free survival (both P &lt; 0·001). Tryptase expression was an independent favourable prognostic factor for overall (HR 0·72; P = 0·027) and recurrence-free (HR 0·74; P = 0·044) survival. The accuracy of an established prognostic model was improved when tryptase expression was added.

Conclusion
Tryptase expression is an independent prognostic factor for overall and recurrence-free survival in patients with gastric cancer after surgical resection.
HIV‐1 p55‐gag protein induces senescence of human bone marrow mesenchymal stem cells and reduces their capacity to support expansion of hematopoietic stem cells in vitro
Authors: Yuan Ya‐hong , Zhao Shan‐shan , Wang Xiao‐li , Teng Zhi‐ping , Li Dong‐sheng , Zeng Yi 
Published: May 2017

AbstractPatients with human immunodeficiency virus‐1 (HIV‐1) infection often present with hematopoietic failure. As the important hematopoietic support cells in the bone marrow (BM), the BM mesenchymal stem cells (BMSCs) can be impacted by HIV proteins that are released by infected cells within BM. In this study, we tested whether HIV protein p55‐gag could induce senescence of BMSCs and reduce their capacity to support expansion of hematopoietic stem cells in vitro. BMSCs were chronically treated with p55‐gag (BMSCgag) for up to 20 days, and their proliferative activity and senescence makers were compared to nontreated cells (BMSCcon). Then, we analyzed the hematopoietic support function of BMSCcon and BMSCgag by determining cellular proliferation, colony‐forming ability, and primitive hematopoietic populations of hematopoietic progenitors grown on the BMSCs. In addition, we compared the gene expression patterns for supporting hematopoiesis of BMSCcon and BMSCgag. The results show that when compared to BMSCcon, BMSCgag reduced their proliferative activity and underwent senescence. The ability of BMSCgag to support the expansion of committed hematopoietic progenitors from umbilical cord blood‐derived CD34+cells may be impaired, while the expression of genes associated with maintaining and enhancing hematopoiesis appeared to be decreased in treated BMSCs compared to control BMSCs. In conclusion, senescence induced by p55‐gag resulted in decreased hematopoietic support function of BMSCs through reducing a series of hematopoietic cytokine expression.
Knock‐down of farnesyl pyrophosphate synthase protects heart‐derived H9c2 cells against hypoxia/reoxygenation‐induced injury
Authors: Dai Dongpu , Wu Huandong , Yang Jian , Shen Shizhen , Zhao Chenze , Ding Jie , Hu Shenjiang 
Published: May 2017

AbstractFarnesyl pyrophosphate synthase (FPPS) is a key enzyme in the mevalonate pathway. Our previous studies have indicated that cardiac‐specific overexpression of FPPS induces cardiac hypertrophy and dysfunction in mice, and inhibition of FPPS prevents angiotensin (Ang) II‐induced hypertrophy in cardiomyocytes. However, the role for FPPS in myocardial ischemia/reperfusion (MIR) injury is still not clear. The objective of this work was to investigate the effect of FPPS on MIR injury in H9c2 cells which were subjected to hypoxia/reoxygenation (HR) to mimic MIR. Prior to HR, cells were transfected with pE‐mFPPS, shFPPS, or pE‐GFP. Our results showed that the overexpression of FPPS reduced cell proliferation, increased cell injury and cell apoptosis, and knock‐down of FPPS improved cell proliferation, decreased cell injury, and cell apoptosis after HR. Besides, overexpression of FPPS increased Rac1 activity and reactive oxygen species (ROS) generation, while FPPS silencing decreased Rac1 activity and ROS generation. Based on these findings, we propose that knock‐down of FPPS reduces Rac1 activity and ROS production, and finally leads to the decrease of HR‐induced injury in H9c2 cells. These findings point that FPPS might be a potential target in preventing H9c2 cells from HR‐induced injury.
Bone marrow‐derived cells response in proximal regions of nerves after peripheral nerve injury
Authors: Chen Lulu , Cheng Jia , Yang Xiaonan , Jin Xiaolei , Qi Zuoliang , Jin Yu‐Qing 
Published: May 2017

AbstractIn recent years, bone marrow‐derived cells have been found to be crucial for peripheral nerve regeneration. After traumatic peripheral nerve injury, bone marrow‐derived macrophages quickly infiltrate into the distal regions of nerves. To explore the changes caused by bone marrow‐derived cells within the proximal regions of the nerves, sciatic nerves of chimeric mice carrying bone marrow cells expressing green fluorescent protein were crushed to observe the infiltration of invading bone marrow‐derived cells. Seven days after surgery, abundant bone marrow‐derived cells had infiltrated into the damaged proximal nerve segments. The numbers of these cells increased to a peak at 2 weeks and then gradually returned to normal levels within 30 weeks. Through immunofluorescence staining, many of these cells were identified as macrophages, and they showed a similar infiltration tendency toward distal nerve segments. However, fewer cells infiltrated proximal segments than distal nerve segments. In conclusion, these findings suggest that bone marrow‐derived cells response not only occurs within the distal nerve segments but may also take place within the proximal segments of nerve tissues after nerve injury.
Fine needle aspiration cytology findings of myxoinflammatory fibroblastic sarcoma: A case report
Authors: Ozaki Satoru , Kasashima Satomi , Kawashima Atsuhiro , Ooi Akishi 
Published: May 2017

AbstractMyxoinflammatory fibroblastic sarcoma (MIFS) is rare low‐grade soft‐tissue tumor that occurs in extremities. Clinically it is difficult to differentiate from benign lesions, such as nodular fasciitis, and malignant tumors, such as liposarcoma. We report a case of MIFS in the forearm of a 34‐year‐old man. The resected tumor measured 5.3 × 2.7 × 2.5 cm3, had a lobular structure with indistinct boundary, and consisted of a large amount of translucent and yellow mucous‐like substrate. Cytological examination of a preoperative puncture aspiration specimen showed histiocyte‐ and fibroblast‐like tumor cells in a mucous‐like matrix together with scattered lipoblast‐ and ganglion‐like cells. Nuclear chromatin of the tumor cells showed a fine granular appearance but no notable hyperchromasia. There were no clear malignant findings. On Giemsa staining of the tumor cells, there were fine granular and hyaline intracytoplasmic substances that showed purple to reddish‐purple metachromaticity. Prominent inflammatory cells were not observed in the specimens. MIFS should be considered in the differential diagnosis for a myxoid tumor in the extremities.
Right‐wing authoritarianism, societal threat to safety, and psychological distress
Authors: Roccato Michele , Russo Silvia 
Published: May 2017

AbstractIn two quasi‐experimental vignette studies, we have analyzed how societal threat to safety moderates the relation between right‐wing authoritarianism (RWA) and psychological distress. In Study 1 (Italian community sample, N = 343), we focused on depressive symptoms (measured with the Center for Epidemiologic Studies Depression Scale and the General Health Questionnaire). Two moderated regressions showed that the relation between RWA and both measures of depressive symptoms was positive and significant only among people exposed to a socially threatening scenario. In Study 2 (Italian student sample, N = 219), we focused on state anxiety and replicated Study 1's results. The findings indicated that, in conditions of societal threat to safety, RWA is a risk factor for psychological distress. Strengths, limitations, and possible developments of this research are discussed.