bluuebunny/crossref_metadata_2025 huggingface dataset:
Solvent front position extraction with semi-automatic device as a powerful sample preparation procedure to quantitatitation of tryptophan in human plasma
Authors: Klimek-Turek Anna , Chomicki Adam , Fornal Emilia , Pradiuch Anna , Hys Michał , Dzido Tadeusz H.
Published: September 2020

In the paper the results of the tryptophan determination in human plasma samples prepared with the novel Solvent Front Position Extraction (SFPE) technique are presented. The SFPE procedure is used for preparation of real biological sample for the first time. The results obtained using SFPE are compared with those using the classical sample preparation procedure. Under the optimal conditions, tryptophan and its internal standard were separated from other plasma compounds (matrix) as a small common zone/spot on a chromatographic plate using semiautomatic device equipped with moving pipet, which distributed developing solvent on the adsorbent layer. Tryptophan and the internal standard were evenly distributed within the small common zone from that the both substances were extracted and the solution obtained was transferred to quantitation with LC–MS and MS techniques. The determination results are satisfactory, the percentage values of relative error and RSD relative standard deviation do not exceed 5%. The procedure is characterized by simplicity, high analysis throughput, very good sample purification and seems to be easy applicable to other biological samples with these advantages mentioned.
A multi-task, multi-stage deep transfer learning model for early prediction of neurodevelopment in very preterm infants
Authors: He Lili , Li Hailong , Wang Jinghua , Chen Ming , Gozdas Elveda , Dillman Jonathan R. , Parikh Nehal A.
Published: September 2020

Survivors following very premature birth (i.e., ≤ 32 weeks gestational age) remain at high risk for neurodevelopmental impairments. Recent advances in deep learning techniques have made it possible to aid the early diagnosis and prognosis of neurodevelopmental deficits. Deep learning models typically require training on large datasets, and unfortunately, large neuroimaging datasets with clinical outcome annotations are typically limited, especially in neonates. Transfer learning represents an important step to solve the fundamental problem of insufficient training data in deep learning. In this work, we developed a multi-task, multi-stage deep transfer learning framework using the fusion of brain connectome and clinical data for early joint prediction of multiple abnormal neurodevelopmental (cognitive, language and motor) outcomes at 2 years corrected age in very preterm infants. The proposed framework maximizes the value of both available annotated and non-annotated data in model training by performing both supervised and unsupervised learning. We first pre-trained a deep neural network prototype in a supervised fashion using 884 older children and adult subjects, and then re-trained this prototype using 291 neonatal subjects without supervision. Finally, we fine-tuned and validated the pre-trained model using 33 preterm infants. Our proposed model identified very preterm infants at high-risk for cognitive, language, and motor deficits at 2 years corrected age with an area under the receiver operating characteristic curve of 0.86, 0.66 and 0.84, respectively. Employing such a deep learning model, once externally validated, may facilitate risk stratification at term-equivalent age for early identification of long-term neurodevelopmental deficits and targeted early interventions to improve clinical outcomes in very preterm infants.
Knee osteoarthritis in young growing rats is associated with widespread osteopenia and impaired bone mineralization
Authors: Namhong Supitra , Wongdee Kannikar , Suntornsaratoon Panan , Teerapornpuntakit Jarinthorn , Hemstapat Ruedee , Charoenphandhu Narattaphol
Published: September 2020

Osteoarthritis (OA) leads to joint pain from intraarticular inflammation with articular cartilage erosion, deterioration of joint function and abnormal subchondral bone structure. Besides aging, chronic repetitive joint injury is a common risk factor in young individuals. Nevertheless, whether OA is associated with bone loss at other skeletal sites is unclear. Since OA-associated proinflammatory cytokines—some of which are osteoclastogenic factors—are often detected in the circulation, we hypothesized that the injury-induced knee OA could result in widespread osteopenia at bone sites distant to the injured knee. Here we performed anterior cruciate ligament transection (ACLT) to induce knee OA in one limb of female Sprague–Dawley rats and determined bone changes post-OA induction by micro-computed tomography and computer-assisted bone histomorphometry. We found that although OA modestly altered bone density, histomorphometric analyses revealed increases in bone resorption and osteoid production with impaired mineralization. The bone formation rate was also reduced in OA rats. In conclusions, ACLT in young growing rats induced microstructural defects in the trabecular portion of weight-bearing (tibia) and non-weight-bearing bones (L5 vertebra), in part by enhancing bone resorption and suppressing bone formation. This finding supports the increasing concern regarding the repetitive sport-related ACL injuries and the consequent bone loss.
In vitro validation of the tear matrix metalloproteinase 9 in-situ immunoassay
Authors: Bang Seung Pil , Son Myeong Jin , Kim Harim , Lee You Hyun , Jun Jong Hwa
Published: September 2020

We aimed to validate a tear MMP-9 in-situ immunoassay (InflammaDry) and to identify factors that could affect results or interpretation. Three factors were examined: sample concentration, volume, and time. Recombinant human (rh) MMP-9 (10 or 20 μl; 0, 12.5, 25, 50, 100, 200, 500, and 1,000 ng/ml) was applied to the kit and the detection limit and assay reproducibility were examined. At a rhMMP-9 volume of 10 μl (≥ 50 ng/ml), all positive results were identified by densitometry at 10 and 20 min; however, after 20 min, more than half of the nine ophthalmologists interpreted a positive result. At a rhMMP-9 volume of 20 μl (≥ 25 ng/ml), ophthalmologists and densitometry identified almost all test lines at 10 and 20 min. At 10 μl, densitometry showed a linear dose–response pattern. At 20 μl, densitometry showed a linear dose–response pattern at concentrations up to 500 ng/ml; however, full saturation was achieved at concentrations ≥ 500 ng/ml. When the same amount of rhMMP-9 was applied, the density result increased significantly upon doubling of the solvent volume (i.e., by adding the same volume of PBS to a sample). InflammaDry showed a high inter- and intra-assay coefficient of variation at 10 min (28.4% and 24.7%, respectively). The results of the MMP-9 in-situ immunoassay varied significantly depending on sample volume. Therefore, when interpreting the results, careful attention must be paid to tear volume.
Extent, intensity and drivers of mammal defaunation: a continental-scale analysis across the Neotropics
Authors: Bogoni Juliano A. , Peres Carlos A. , Ferraz Katia M. P. M. B.
Published: September 2020

Neotropical mammal diversity is currently threatened by several chronic human-induced pressures. We compiled 1,029 contemporary mammal assemblages surveyed across the Neotropics to quantify the continental-scale extent and intensity of defaunation and understand their determinants based on environmental covariates. We calculated a local defaunation index for all assemblages—adjusted by a false-absence ratio—which was examined using structural equation models. We propose a hunting index based on socioenvironmental co-variables that either intensify or inhibit hunting, which we used as an additional predictor of defaunation. Mammal defaunation intensity across the Neotropics on average erased 56.5% of the local source fauna, with ungulates comprising the most ubiquitous losses. The extent of defaunation is widespread, but more incipient in hitherto relatively intact major biomes that are rapidly succumbing to encroaching deforestation frontiers. Assemblage-wide mammal body mass distribution was greatly reduced from a historical 95th-percentile of ~ 14 kg to only ~ 4 kg in modern assemblages. Defaunation and depletion of large-bodied species were primarily driven by hunting pressure and remaining habitat area. Our findings can inform guidelines to design transnational conservation policies to safeguard native vertebrates, and ensure that the “empty ecosystem” syndrome will be deterred from reaching much of the New World tropics.
A noise-resisted scheme of dynamical decoupling pulses for quantum memories
Authors: Gong Bo , Tu Tao , Zhu Xing-Yu , Guo Ao-lin , Zhou Zong-quan , Guo Guang-Can , Li Chuan-Feng
Published: September 2020

Stable quantum memories that capable of storing quantum information for long time scales are an essential building block for an array of potential applications. The long memory time are usually achieved via dynamical decoupling technique involving decoupling of the memory states from its local environment. However, because this process is strongly limited by the errors in the pulses, an noise-protected scheme remains challenging in the field of quantum memories. Here we propose a scheme to design a noise-resisted $$\pi$$
π
pulse, which features high fidelity exceeding $$99.9\%$$

99.9
%

under realistic situations. Using this $$\pi$$
π
pulse we can generate different dynamical decoupling sequences that preserve high fidelity for long time scales. The versatility, robustness, and potential scalability of this method may allow for various applications in quantum memories technology.
Quantification of colorimetric isothermal amplification on the smartphone and its open-source app for point-of-care pathogen detection
Authors: Nguyen Huynh Quoc , Nguyen Van Dan , Van Nguyen Hau , Seo Tae Seok
Published: September 2020

The increasing risk of infectious pathogens, especially in the under-developed countries, is demanding the development of point-of-care (POC) nucleic acid testing in the low-resource setting conditions. Here, we describe a methodology for colorimetric quantitative analysis of nucleic acid using an easy-to-build smartphone-based platform, offering low-cost, portability, simplicity in operation, and user-friendliness. The whole system consists of a hand-held box equipped with a smartphone, a film heater, a white LED, a loop-mediated isothermal amplification (LAMP) chip, and a DC converter, and all the processes were powered by a portable battery of 5 V. Upon the amplification of the target gene by an Eriochrome Black T-mediated LAMP reaction, the color of the LAMP reaction was changed from violet to blue that was real-time recorded by a smartphone camera. To keep track of the progress of the color change, we developed a novel mobile app in which a hue value was accepted as an indicator for color transition and for determining the threshold time of the amplification reaction. A calibration curve could be generated by plotting the logarithm of the known concentration of the DNA templates versus the threshold time, and it can be used to predict the copy number of nucleic acids in the test samples. Thus, the proposed mobile platform can inform us of not only qualitative but also quantitative results of the pathogens. We believe that this advanced colorimetric approach and the mobile app can expand the potentials of the smartphone for the future POCT system in the bio-diagnostic fields.
Elevated IL-6R on CD4+ T cells promotes IL-6 driven Th17 cell responses in patients with T1R leprosy reactions
Authors: Saini Chaman , Srivastava Rupesh K. , Tarique Mohd. , Kurra Santosh , Khanna Neena , Ramesh V. , Sharma Alpana
Published: September 2020

Th17 cells play vital role during pathogenesis of leprosy reactions. Previously, we have reported that IL-23 is involved in Th17 cells differentiation. Subsequently, our group also showed that IL-6 induces Th17 cell differentiation along with TGF-β in leprosy reactions. Here, we next asked the question that whether IL-6 or IL-23 induced Th17 cells are different in nature? In this study, Type 1 Reactions (T1R) showed significantly (p < 0.001) higher percentage of IL-17A producing CD4+IL6R+ T cells as compared to non-reaction (NR) patients. Furthermore, recombinant IL-6, IL-23 and TGF-β promoted IL-17A secretion by CD4+IL6R+ T cells. Subsequently, IL-6R and IL-23R blocking experiments showed significantly (p < 0.002) down regulated IL-17A in T1R reaction as compared to NR leprosy patients. The present study for the first time establishes that pathogenic Th17 cells produce IL-17 in an IL-6 dependent manner in leprosy T1R reactions. Thus, present approaches that specifically target Th17 cells and/or the cytokines that promote their development, such as IL-6, TGF-β and IL-23A may provide more focused treatment strategies for the management of Mycobacterium leprae and its reactions.
Copy number variations in ultrasonically abnormal late pregnancy fetuses with normal karyotypes
Authors: Cai Meiying , Lin Na , Su Linjuan , Wu Xiaoqing , Xie Xiaorui , Li Ying , Lin Yuan , Xu Liangpu , Huang Hailong
Published: September 2020

Many fetuses are found to have ultrasonic abnormalities in the late pregnancy. The association of fetal ultrasound abnormalities in late pregnancy with copy number variations (CNVs) is unclear. We attempted to explore the relationship between types of ultrasonically abnormal late pregnancy fetuses and CNVs. Fetuses (n = 713) with ultrasound-detected abnormalities in late pregnancy and normal karyotypes were analyzed. Of these, 237 showed fetal sonographic structural malformations and 476 showed fetal non-structural abnormalities. Single nucleotide polymorphism (SNP)-based chromosomal microarray (CMA) was performed on the Affymetrix CytoScan HD platform. Using the SNP array, abnormal CNVs were detected in 8.0% (57/713) of the cases, with pathogenic CNVs in 32 cases and variants of uncertain clinical significance (VUS) in 25 cases. The detection rate of abnormal CNVs in fetuses with sonographic structural malformations (12.7%, 30/237) was significantly higher (P = 0.001) than that in the fetuses with non-structural abnormalities (5.7%, 27/476). Overall, we observed that when fetal sonographic structural malformations or non-structural abnormalities occurred in the third trimester of pregnancy, the use of SNP analysis could improve the accuracy of prenatal diagnosis and reduce the rate of pregnancy termination.
Behavioral and trophic segregations help the Tahiti petrel to cope with the abundance of wedge-tailed shearwater when foraging in oligotrophic tropical waters
Authors: Ravache Andreas , Bourgeois Karen , Weimerskirch Henri , Pagenaud Angélique , de Grissac Sophie , Miller Mark , Dromzée Sylvain , Lorrain Anne , Allain Valérie , Bustamante Paco , Bylemans Jonas , Gleeson Dianne , Letourneur Yves , Vidal Éric
Published: September 2020

Two species breeding in sympatry are more likely to coexist if their ecological niches are segregated either in time, space or in trophic habits. Here, we combined GPS-tracking, stable isotope analysis and DNA metabarcoding analysis to understand how the rare Tahiti petrelPseudobulweria rostrata(TP) copes with the very abundant (i.e. 500,000 breeding pairs) wedge-tailed shearwaterArdenna pacifica(WTS) when breeding in sympatry in a tropical area. WTS foraged in restricted areas along their path, while TP predominantly foraged using extensive search behavior, suggesting a more opportunistic foraging strategy. Interspecific overlap of foraging areas was higher than intraspecific overlap. Breeding seasons largely overlap between species during the study, but TP seems to be asynchronous breeders. TP fed upon prey with higher δ15N values than WTS, and their diet was mainly composed of deep-sea organisms. TP could feed upon dead prey floating at the surface while WTS preyed mainly upon fish species that generally move in schools. Our study highlights several segregating mechanisms (temporal, behavioral and trophic) that could facilitate the coexistence of the two species despite the predominant number of WTS, and provides the very first information on the foraging and trophic ecology of the poorly-known TP.
Record-high positive refractive index change in bismuth germanate crystals through ultrafast laser enhanced polarizability
Authors: Fernandez T. Toney , Privat Karen , Withford Michael J. , Gross Simon
Published: September 2020

Unlike other crystals, the counter intuitive response of bismuth germanate crystals ($${\text {Bi}}_4{\text {Ge}}_3{\text {O}}_{12}$$

Bi
4

Ge
3

O
12

, BGO) to form localized high refractive index contrast waveguides upon ultrafast laser irradiation is explained for the first time. While the waveguide formation is a result of a stoichiometric reorganization of germanium and oxygen, the origin of positive index stems from the formation of highly polarisable non-bridging oxygen complexes. Micro-reflectivity measurements revealed a record-high positive refractive index contrast of $$4.25\times 10^{-2}$$

4.25
×

10

-
2

. The currently accepted view that index changes $$>1\times 10^{-2}$$

>
1
×

10

-
2

could be brought about only by engaging heavy metal elements is strongly challenged by this report. The combination of a nearly perfect step-index profile, record-high refractive index contrast, easily tunable waveguide dimensions, and the intrinsic high optical non-linearity, electro-optic activity and optical transparency up to $$5.5\,\upmu {\text {m}}$$

5.5

μ
m

of BGO make these waveguides a highly attractive platform for compact 3D integrated optics.
Resolution dependence of CO2-induced Tropical Atlantic sector climate changes
Authors: Park W. , Latif M.
Published: September 2020

A long-standing problem in state-of-the-art climate models is the Tropical Atlantic (TA) warm sea surface temperature (SST) bias, which goes along with major biases in large-scale atmospheric circulation. Here we show that TA-sector climate changes forced by increasing atmospheric carbon dioxide (CO2) levels are sensitive to model resolution. Two versions of a climate model employing greatly varying atmospheric resolution and exhibiting very different warm bias strength are compared. The version with high atmospheric resolution features a small SST bias and simulates an eastward amplified SST warming over the equatorial Atlantic, in line with the observed SST trends since the mid-20th century. On the contrary, the version with coarse atmospheric resolution exhibits a large SST bias and projects relatively uniform SST changes across the equatorial Atlantic. In both model versions, the warming pattern resembles the pattern of interannual SST variability simulated under present-day conditions. Atmospheric changes also vastly differ among the two climate model versions. In the version with small SST bias, a deep atmospheric response is simulated with a major change in the Walker circulation and strongly enhanced rainfall over the equatorial region, whereas the atmospheric response is much weaker and of rather different character in the model with large SST bias. This study suggests that higher atmospheric resolution in climate models may enhance global warming projections over the TA sector.
Carbon Nanotube Synthesis and Applications
Authors: Kumar Arvind , Li Xuexiong , Cai Changwei , Chen Zhihong , Cai Xingke
Published: September 2020

In this chapter, the synthesis and applications of carbon nanotubes are discussed. The synthesis of carbon nanotubes by different methods, including arc discharge, laser ablation and chemical vapor deposition, are discussed. Recent progress on the effect of controlled synthesis on the different parameters, such as yield, production, density, diameter, conductive behavior and chirality, are described. Then, the properties of carbon nanotubes are introduced, including their excellent electrical/thermal conductivity, high specific surface area, tunable band gap and unique optical properties, etc. The applications and roles of carbon nanotubes in energy conversion/storage and optoelectronic devices are also summarized based on their unique properties.
Dynamic monitoring of a bi-enzymatic reaction at a single biomimetic giant vesicle
Authors: Lefrançois Pauline , Goudeau Bertrand , Arbault Stéphane
Published: September 2020

Giant unilamellar vesicles were used as individual biomimetic micro-reactors wherein a model bi-enzymatic reaction involving a glucose oxidase (GOx) and horseradish peroxidase (HRP) was monitored by confocal microscopy.
A dual functional collagen scaffold coordinates angiogenesis and inflammation for diabetic wound healing
Authors: Long Ge , Liu Dingyang , He Xi , Shen Yeyu , Zhao Yannan , Hou Xianglin , Chen Bing , OuYang Wen , Dai Jianwu , Li Xing
Published: September 2020

Chronic diabetic wounds, which are associated with persistent inflammation and impaired angiogenesis, occur frequently in diabetic patients.
Synthesis of β- and γ-lactam fused dihydropyrazinones from Ugi adducts via a sequential ring construction strategy
Authors: Singh Sangh Priya , Tripathi Shashank , Yadav Anamika , Kant Ruchir , Srivastava Hemant Kumar , Srivastava Ajay Kumar
Published: September 2020

An efficient and novel method for the synthesis of bicyclic lactams is reported via post-Ugi functionalization.
Ketone transformation as a pathway to inherently chiral rigidified calix[4]arenes
Authors: Tlustý Martin , Spálovská Dita , Kohout Michal , Eigner Václav , Lhoták Pavel
Published: September 2020

A novel strategy for bridging the upper rim of calix[4]arenes consisting in carbonyl group formation and subsequent “extension” into a two-atom bridge is presented.
Construction of an MZO heterojunction system with improved photocatalytic activity for degradation of organic dyes
Authors: Quan Yingnan , Su Rui , Hu Mingyue , Lang Jihui , Fan Hougang , Shen He , Gao Ming , Li Baizhi , Liu Yang , Yang Jinghai
Published: September 2020

Aiming at the challenging problems in environmental remediation, we have designed a novel MZO heterojunction material for applications in photocatalysis.
Magnetism arising from Mexican-hat-like band dispersion in the WSe2/SnS2 heterostructure via interlayer strain
Authors: Zhang Shuai , Li Chong , Shang Jimin , Li Haisheng , Wang Zhaowu , Li Liben , Jia Yu
Published: September 2020

Mexican-hat-like band dispersion is extremely critical to the realization of hole-doping-induced magnetism in monolayer metal monochalcogenides.
Quantum computation of silicon electronic band structure
Authors: Cerasoli Frank T. , Sherbert Kyle , Sławińska Jagoda , Buongiorno Nardelli Marco
Published: September 2020

We present minimal depth circuits implementing the variational quantum eigensolver algorithm and successfully use it to compute the band structure of silicon on a quantum machine for the first time.
Electrically tuned hyperfine spectrum in neutral Tb(ii)(CpiPr5)2 single-molecule magnet
Authors: Smith Robert L. , Wysocki Aleksander L. , Park Kyungwha
Published: September 2020

A strong Fermi contact (FC)-driven and electrically tunable hyperfine interaction is predicted for the neutral Tb(ii)(CpiPr5)2 single-molecule magnet.
The nanomechanics of individual proteins
Authors: Mora Marc , Stannard Andrew , Garcia-Manyes Sergi
Published: September 2020

This tutorial review provides an overview of the single protein force spectroscopy field, including the main techniques and the basic tools for analysing the data obtained from the single molecule experiments.
High yield synthesis of nanoscale high-silica ZSM-5 zeolites via interzeolite transformation with a new strategy
Authors: Xu Lanjian , Yuan Yangyang , Han Qiao , Dong Lei , Chen Lei , Zhang Xiaomin , Xu Lei
Published: September 2020

An “OSDA-confined” interzeolite transformation strategy was employed successfully to synthesize nanoscale high-silica ZSM-5 with high yield.
Correction: Olefin methylation and cracking reactions in H-SSZ-13 investigated with ab initio and DFT calculations
Authors: Plessow Philipp N. , Studt Felix
Published: September 2020

Correction for ‘Olefin methylation and cracking reactions in H-SSZ-13 investigated with ab initio and DFT calculations’ by Philipp N. Plessow et al., Catal. Sci. Technol., 2018, 8, 4420–4429, DOI: 10.1039/C8CY01194J.
Speciation, thermodynamics and structure of Np(v) oxalate complexes in aqueous solution
Authors: Maiwald M. M. , Trumm M. , Dardenne K. , Rothe J. , Skerencak-Frech A. , Panak P. J.
Published: September 2020

The speciation, thermodynamics and structure of the Np(v) (as the NpO2+cation) complexes with oxalate (Ox2−) are studied by different spectroscopic techniques.
Metathetic synthesis of lead cyanamide as a p-type semiconductor
Authors: Qiao Xianji , Ma Zili , Luo Dongbao , Corkett Alex J. , Slabon Adam , Rokicinska Anna , Kuśtrowski Piotr , Dronskowski Richard
Published: September 2020

p-Type PbNCN provides the first experimental evidence in applying inorganic cyanamides as photocathodes for reductive reactions in photoelectrochemical cells.
Citrus flavanone metabolites protect pancreatic-β cells under oxidative stress induced by cholesterol
Authors: Anacleto Sara L. , Milenkovic Dragan , Kroon Paul A. , Needs Paul W. , Lajolo Franco Maria , Hassimotto Neuza M. A.
Published: September 2020

Flavanone metabolites decreased the oxidative biomarkers and this effect might be associated with the anti-apoptotic and antioxidant properties of these compounds as well their ability to prevent mitochondrial and insulin secretion dysfunction.
Two polyphenol-rich Brazilian fruit extracts protect from diet-induced obesity and hepatic steatosis in mice
Authors: Ballard Cíntia Reis , dos Santos Elisvânia Freitas , Dubois Marie-Julie , Pilon Geneviève , Cazarin Cinthia Baú Betim , Maróstica Junior Mário Roberto , Marette Andre
Published: September 2020

Tucum-do-Pantanal and taruma-do-cerrado extracts, rich in polyphenols, improved metabolic health in mice.
μCB-seq: microfluidic cell barcoding and sequencing for high-resolution imaging and sequencing of single cells
Authors: Chen Tyler N. , Gupta Anushka , Zalavadia Mansi D. , Streets Aaron
Published: September 2020

We present a platform for on-chip molecular barcoding that combines high-resolution imaging with genomic analysis, enabling multi-modal phenotypic measurements in single cells.
Diketopyrrolopyrrole linked porphyrin dimers for visible-near-infrared photoresponsive nonfullerene organic solar cells
Authors: Piradi Venkatesh , Xu Xiaopeng , Peng Qiang , Zhu Xunjin
Published: September 2020

The binding of a porphyrin dimer donor (ETDPP-2P) and a non-fullerene acceptor IT-M leads to a visible-near-infrared photoresponse in all small molecule organic solar cells with a power conversion efficiency of 5.69%.
Origin of different chain-end microstructures in ethylene/vinyl halide copolymerization catalysed by phosphine–sulfonate palladium complexes
Authors: Mehmood Andleeb , Xu Xiaowei , Kang Xiaohui , Luo Yi
Published: September 2020

Ethylene and vinyl halide (VX, X = F or Cl) copolymerization mechanism in the presence of catalysts A ((POOMe,OMe)PdMe, POOMe,OMe = {2(2-MeOC6H4)(2-SO3-5-MeC6H3)P}) and A′ ((POBp,OMe)PdMe, POBp,OMe = {(2-MeOC6H4)(2-{2,6-(MeO)2C6H3}C6H4)(2-SO3-5-MeC6H3)P}) has been comparatively studied via density functional theory (DFT) calculations.
Photoredox β-thiol-α-carbonylation of enones accompanied by unexpected Csp2–C(CO) bond cleavage
Authors: Ma Rui , Feng Jie , Zhang Kuili , Zhang Beichen , Du Ding
Published: September 2020

An olefinic difunctionalization method of enones was presented hereviaaerobic visible-light catalysis.
An amine-bifunctionalization strategy with Beta/KIT-6 composite as a support for CO2 adsorbent preparation
Authors: Yuan Yuan , Wei Jianwen , Geng Linlin , Mei Dejun , Liao Lei
Published: September 2020

CO2 adsorption curves of A-BK-TEPA-50 at 40, 60, 75, 80 and 90 °C.
Effect of localized UV irradiation on the crystallinity and electrical properties of dip-coated polythiophene thin films
Authors: Park So Young , Kwon Eun Hye , Park Yeong Don
Published: September 2020

When the top part of the solution was irradiated with UV light, the dip-coated P3HT film showed enhanced crystallinity and electrical properties.
Corrosion resistance of Ni–P/SiC and Ni–P composite coatings prepared by magnetic field-enhanced jet electrodeposition
Authors: Fu Xiuqing , Wang Feixiang , Chen Xinxin , Lin Jinran , Cao Hongbing
Published: September 2020

We investigated the effect of magnetic field on Ni–P and Ni–P/SiC composite coatings prepared by jet electrodeposition.
Rapid synthesis of cesium lead halide perovskite nanocrystals by l-lysine assisted solid-phase reaction at room temperature
Authors: Hu Yi-Lin , Wen Qiu-Lin , Pu Zheng-Fen , Liu An-Yong , Wang Jun , Ling Jian , Xie Xiao-Guang , Cao Qiu-E.
Published: September 2020

By comparing three different solid-phase reactions of perovskite powder synthesized using lysine, the reaction process and properties were studied.
A FRET-based fluorescent Zn2+sensor: 3D ratiometric imaging, flow cytometric tracking and cisplatin-induced Zn2+fluctuation monitoring
Authors: Xu Hongxia , Zhu Chengcheng , Chen Yuncong , Bai Yang , Han Zhong , Yao Shankun , Jiao Yang , Yuan Hao , He Weijiang , Guo Zijian
Published: September 2020

A Zn2+sensor exhibiting 3D ratiometric imaging and flow cytometric ability was constructed based on the FRET mechanism, and cisplatin-induced endogenous labile Zn2+fluctuations were monitored in real time.
Enantioselective synthesis of highly oxygenated acyclic quaternary center-containing building blocks via palladium-catalyzed decarboxylative allylic alkylation of cyclic siloxyketones
Authors: Ngamnithiporn Aurapat , Iwayama Toshihiko , Bartberger Michael D. , Stoltz Brian M.
Published: September 2020

The development of a palladium-catalyzed enantioselective decarboxylative allylic alkylation of cyclic siloxyketones to produce enantioenriched silicon-tethered heterocycles is reported.
High performance flexible memristors based on a lead free AgBiI4perovskite with an ultralow operating voltage
Authors: Ye Haibo , Sun Bo , Wang Ziyi , Liu Zhiyong , Zhang Xuning , Tan Xianhua , Shi Tielin , Tang Zirong , Liao Guanglan
Published: September 2020

Lead-free inorganic perovskite materials exhibit excellent memristive properties, such as high ON/OFF ratio and low switching voltage.
Unbiased converted measurement manoeuvering target tracking under maximum correntropy criterion
Authors: Wang Guoyong , Feng Xiaoliang
Published: September 2020

In this study, the manoeuvering target tracking problem is addressed by using the unbiased converted measurements from a two‐dimensional radar system. Due to the fact that radar measurements are usually expressed in polar coordinates while the target motion is described in the Cartesian coordinates, the unbiased converted measurements are utilised to linearise the system model of the manoeuvering target tracking problem in the Cartesian coordinates. The manoeuver acceleration is modelled as the unknown input of the constant velocity kinematic model of the target. First, it is pointed out that the converted measurement noise no longer satisfies Gaussian distribution, even if the raw radar measurement noise is Gaussian noise. In order to solve the manoeuvering target tracking problem with non‐Gaussian disturbances, a joint estimation method for the target state and the unknown input is presented under the maximum correntropy criterion. In the simulation, the proposed manoeuvering target tracking method is compared with the one developed on the basis of the traditional Kalman filter. The simulation results verify the effectiveness of the method proposed in this study.
Research on Rural Cultural Space Reconstruction Based on the Theory of Space Production
Authors: Zhong Xianghu
Published: September 2020

Rural construction has been paid attention to by the country, and different strategies have been adopted at different stages. The rural revitalization proposed in the new era is a comprehensive revitalization including culture. Based on the three spatial concepts of space perception, space conception and space reproduction proposed by Lefebvre, the article takes the construction of the sensible space, conceptual space and living space of rural culture as the important content of the reconstruction of rural cultural space. From the ecological, historical and subjective perspective of the rural cultural space, this paper explores the internal logic of the reconstruction of the modern rural cultural space. That is, to follow the ecological balance of the cultural space, and to meet the living requirements of the cultural space. Rural cultural space reconstruction should respect its the historical tradition and awaken the memory of homesickness. At same time, there is rural residents’ cultural consciousness. Cultural reconstruction needs toreflect their subjective status.
Research on method for high sensitive detection of harmful gases in livestock houses based on laser absorption spectrum
Authors: Wang Runyu , Dong Daming , Ji Zengtao , Jiao Leizi
Published: September 2020

Harmful gases such as ammonia and hydrogen sulfide in livestock and poultry houses can seriously damage the health of livestock and poultry as well as animal keepers, so it is great significant to detect these harmful gases rapidly and accurately for the improvement of the welfare of animals and the health of animal keepers. Laser absorption spectroscopy is a gas detection method with the advantages of high sensitivity and selectivity, and is widely used in industrial gas detection. However, it needs further exploring to verify whether laser absorption spectroscopy is useful in detecting low concentration harmful gases in livestock and poultry houses. This paper researches on the method for high-sensitivity detection of harmful gases in livestock and poultry houses based on laser absorption spectroscopy by detecting the absorption signals of ammonia with a self-designed system including a tunable laser wavelength scanning system, a photoelectric detecting system and a long light path gas absorption well, and verifies that laser absorption spectroscopy can be used for detecting harmful gases in livestock and poultry houses.
The New Type of Agricultural Management Main Body and Its Education and Training Mode in the Rural Rejuvenation Period
Authors: Wan Ajun , Zhang Zhi Ang
Published: September 2020

The modern agricultural industrial system composed of new agricultural management entities is the main force for rural revitalization. However, the research on the main body of new agricultural management is still in its infancy. This paper summarizes the existing problems of the new type of agricultural main body through a comprehensive summary and analysis of the research on the concept, type, characteristics and training mode of the new type of agricultural main body. At the same time, it summarizes the cultivation model of new agricultural management from the perspective of type and specialty. The new type of agricultural business entities can provide a guarantee foundation for the direction of large-scale mechanization of agricultural development in the future, expand the channels for agricultural entities to obtain information, and play the role of information resource allocation.
Research progress of biochar on agricultural soil improvement
Authors: Haojie Han , Qing Xia , Qin Zhao , Caixia Zheng , Zhiliang Zhang
Published: September 2020

Biochar is an environmentally friendly soil amendment produced by pyrolysis of biomass such as agricultural and forestry wastes or animal manure under anaerobic or highly anaerobic conditions. Due to its good physical structure and rich surface properties, it has gradually become a research hotspot in agricultural soil improvement. Based on the existing research results at home and abroad, this article systematically summarizes the properties of biochar, the production process and the mechanism of agricultural soil improvement so far. At the same time, the future scientific research on the effect of biochar in the field of agricultural soil improvement is put forward, aiming to provide a reference for it in the field of agricultural soil improvement.
Research on Forest Ecological Benefit Compensation System of Heilongjiang in China
Authors: Jiang Fan
Published: September 2020

The forest ecological function zone in Heilongjiang Province is an important barrier for maintaining ecological security in my country. Its forest ecological environment has great influence on the sustainable development of regional economy and society and the ecological security of neighboring regions. Based on reading domestic and foreign related documents on forest ecological benefit compensation, this article firstly discusses the current situation and problems of the forest ecological benefit compensation system in Heilongjiang Province. Secondly, it analyzes the current status of the implementation of the international forest ecological benefit compensation system and draws relevant enlightenment to China. At last, it summarizes and propose countermeasures and suggestions to improve the forest ecological benefit compensation system in Heilongjiang Province.
Discussion on Application of Molecular Biology Technology in Pathogenic Microorganism Examination
Authors: Lihua Zhang
Published: September 2020

The implementation of pathogenic microorganism inspection work has a positive significance for the development of pharmaceuticals, food and other industries. It is precisely because of the existence of molecular biology technology that the reliability and accuracy of pathogenic microorganism inspection results can be better presented. This article summarizes the application advantages of molecular biology technology based on previous work experience. At the same time, this article discusses the application of molecular biology technology in pathogenic microorganism inspection from the application of polymerase chain reaction pathogenic microorganism inspection technology, biosensor pathogenic microorganism inspection technology, gene chip pathogenic microorganism inspection technology, accounting probe pathogenic microorganism inspection technology and PCR technology these five aspects.
Guiding children towards healthy dietary habits based on nutrition education
Authors: Ping Li
Published: September 2020

Cultivation and development of children’s healthy diet behaviors is one the major purposes of children’s education, and meanwhile it will have far-reaching impact on the behaviors of behaviors. Healthy diet behaviors of children refer to rational selection and intake of food so that the children can ensure enough intake of nutrition that can meet the needs for metabolism and growth. Thus, it is of vital importance to develop healthy diet habits of children. This study interprets the physical qualities of adolescents, analyzes the guiding role and value of nutrition education on the children’s healthy diet behaviors, and explores how to give full play to the role of nutrition education to children’s healthy diet behaviors.
Detection of Urethane in Non-alcoholic Fermented Food
Authors: Lihua Zhang
Published: September 2020

Among fermented foods, urethane often appears, which is a “2A” grade carcinogen. There are many types of fermented foods in my country, and the detection methods are not uniform enough, and no specific urethane detection standards have been formed. This article summarizes the specific experiments and results analysis based on previous work experience. At the same time, this article discusses six aspects from thin layer analysis, gas chromatography, gas chromatography-mass spectrometry, two-dimensional live multidimensional gas chromatography with stable isotope labeling mass spectrometry, high performance liquid chromatography-fluorescence, and nuclear magnetic resonance detection. The detection method of urethane in non-alcoholic fermented foods is introduced.
Application and Development of Functional Magnetic Nanomaterials in Food Quality and Safety Inspection
Authors: Su Rui
Published: September 2020

At present, people are paying more and more attention to the accuracy, convenience, and efficiency of food quality and safety testing. However, many traditional detection methods have some problems such as inconvenient operation, interference factors, and long detection time. Therefore, functionalized magnetic nanomaterials with higher selectivity and sensitivity are widely used in food detection, such as pesticides, veterinary drugs, heavy metals, additives, and synthetic pigments, pathogenic bacteria, and mycotoxins. In this paper, the practical application of functionalized magnetic nanomaterials and their related detection technologies are reviewed, and their future development direction is discussed. Functional magnetic nanomaterials can solve some problems that exist in magnetic nanomaterials to a great extent, making detection more efficient, economical, accurate, rapid and convenient. However, in the future, people still need to further study more stable and efficient magnetic nanomaterials to cope with various complex detection situations.
Enshi sulfur dioxide residues in food risk assessment
Authors: He Xiaohong , Wu Rangpeng , Tan Meiqiong , Mu Zhihao , Liu Jihua
Published: September 2020

From 2012 to 2019, the risk monitoring of food chemical contaminants and harmful factors in Enshi Prefecture found that the sulfur dioxide residues in food exceeded the standard seriously, and the sample exceeded the standard rate of 8.16%-17.7%, including pickled vegetables, edible starch, and dried vegetables. Among them, the sulfur dioxide content exceeded the standard rate of 63.64%, 48.00%, 30.09%, and the risk quotient (HQ) was 0.464, 0.075, and 0.527, respectively. Due to the low consumption of dried vegetables, pickled vegetables, edible starch and edible fungus products, they are still at a safe level, but the cumulative effect of sulfur dioxide residues in the diet may pose health risks to consumers.
Effects of different treatments on seed germination of Elymus tangutorum infected with Epichloë bromicola
Authors: Cheng Fang-Shu , Li Ren-Hui , Li Fan , Han Xiao-Yan , Song Qiu-Yan
Published: September 2020

The seeds of Elymus tangutorum infected with Epichloë bromicola were treated by soaked, wet-dry cycle, mechanical damage, and fungicide. The germination time and germination rate the seeds were measured. The results showed that each treatment had a certain effect on the germination of E. tangutorum infected with Ep. bromicola seeds. The total germination rate: wet-dry cycle (soaked for 6h, dried for 6h)> mechanical damage> fungicide (cyclosporin T) immersion (6h)> aseptic water soaked (6h)> CK can be seen from the experimental data. And wet-dry cycle, aseptic water soaked, and mechanical damage have significant effect on increasing the rate of seeds. Among these methods, the germination rate of the seeds treated by wet-dry cycle method was the highest. The treatment has both chemical and physiological functions, thus improving the germination rate and propagation coefficient of seeds.
Design of Visual Platform for Fisheries and Aquaculture Production Based on Geographic Information System Technologies
Authors: Ning Li , Xue Yan , JinXing Cheng , YingZe Sun
Published: September 2020

With the deterioration of ecological environment and the increasing demand for aquatic products, the development of fishing remains seriously threatened from various aspects, especially for production planning and control in particular place and time. Therefore, this technical paper develops a visual platform based on Geographic Information System (GIS) aim to help managers formulate sensible policy with the intention of achieving sustainable fisheries development. The key design of this system lies in the association of attribute database and GIS technologies referring to the Leftlet map. There are mainly two contributions in this article: (i) the visualizations of aquaculture production quantity are first proposed according to the geographical location and species category; (ii) system provides the superior results of statistical analysis on user interface due to the technical processing on data association and light or color intensities presentations. Furthermore, the web service is constructed and extended on the principles of the Browser/Server (B/S) architecture whose purpose is to reach efficiency of exploitation and operations.
Supplementation of Rhodomyrtus tomentosa fruit polyphenols improved dextran sulfate induced colitis in mice by regulating gut microbiota
Authors: Zhang Jianing , Chai Shuyuan , Jia Xi , Han Yujin , Liu Yufei , He Xiaohong , Li Yanmei , Yuan Fahu
Published: September 2020

To investigate the therapeutic effect of polyphenol from the fruits of Rhodomyrtus tomentosa (RTFP) on experimental colitis induced by dextran sulphate sodium(DSS) in mice. A total of 24 Babl/c mice were randomly divided into normal control group, colitis model group and DSS+RTFP intervention group, respectively. The intestinal disease activity index (DAI), pathological histology of colon were investigated, and the changes of gut microbiota in mice were evaluated by 16S rRNA sequencing. Compared with the DSS-induced colitis group, RTFP showed intestinal anti-inflammatory effects, the DAI score was significantly decreased, RTFP improved colitis induced weight loss, fecal imformation and blood in the stool. RTFP relieved the phenomenon of shortening colon length, shortening intestinal wall, and splenomegaly. RTFP intervention inhibited the increase of bacteroides abundance caused by DSS, and remodeled the diversity of gut microbiota. Taken together, RTFP could effectively intervene in experimental colitis induced by DSS in mice, which may be related to the modulating gut microbiota and intestinal cell immune balance.
Variability in Nutritional Composition, Kernel Morphology and Cooking Quality of Selected Rice in Xingan Meng from Northeast China
Authors: Zhu Hong , Liang Ke-hong , Qiu Ju , Wang Jing , Ji Zhi-yuan
Published: September 2020

Paddy rice cultivation expanded in Northeast China, and Xingan Meng of Inner Mongolia is an emerging area of rice production area. The goals of this study: i) to investigate varietal differences in levels of nutritional quality, kernel morphology and cooking quality and ii) to identify clusters of rice samples from Xingan Meng, northeast part of China. Research was conducted in Xingan Meng, China during the 2019 rice-growing season. The nutritional quality (energy, protein, carbohydrate, lipid, amylose, ash, Ca, Na, Fe, Zn, Mn), cooking quality (alkali spreading value, gel consistency) and kernel morphology (length, width, length width ratio, chalky rice percentage, chalky rice degree) were analysed. Significant difference were found across all traits. The largest variation was found for Mn, followed by Ca, Fe and Zn content. Four principal components were found that accounted for 95.14% of overall variability. Cluster analysis sorted the rice sample into four clusters based on nutritional quality, kernel morphology, and cooking quality. The findings of this study can support to demonstrate the quality of rice from Xingan Meng, northeast part of China.