Chinoketides A and B, Two New Antimicrobial Polyketides from the Endophytes of Distylium chinense with the "Black-Box" Co-culture Method

Meng-Meng Lv,Ming-Hui Tan,Li-Wen Lu,Rong-Hua Zhang,Zhi-Yong Guo,Cheng-Xiong Liu,Jin Yang,Kun Zou,Peter Proksch 한국생약학회 2018 Natural Product Sciences Vol.24 No.3

Two new polyketides, chinoketides A and B (1 - 2) with a known compound xylarphthalide A (3), were isolated from the solid medium of the endophytes from the leaves of the relic plant Distylium chinense with the "black-box" co-culture method, and the structures of two new compounds were elucidated by NMR, MS and CD spectra. And the absolute configurations of chinoketides A (1) and B (2) were determined as 2R,3R,8S and 5R,6S by calculating their ECD spectra to compare with the experimental CD spectra. Finally, the antimicrobial activities were evaluated to Erwinia carotovora sub sp. Carotovora (Jones) Bersey et al, and the results showed that compounds 1 - 3 displayed the antimicrobial activities with MIC value at 20.5, 30.4 and 10.2 mg/mL.

EDUCATION AND SUPPORT FOR CHILDREN WITH AUTISM IN CHINA : INITIAL FINDINGS FROM AN INVESTIGATION IN JIANGSU PROVINCE

( Meng Deng ),( Xurong Xiong ) 대구대학교 한국특수교육문제연구소 2015 Asia-Pacific Journal of Intellectual Disabilities Vol.2 No.1

Autism has recently drawn increasing attention from Chinese society and there has been a surge of educational services for children with autism. However, there is a dearth of research on autism spectrum disorder and educational services provided for such children in China. This study has found that private institutions have been playing a leading role in catering for the needs of children with autism, and the current Chinese special and regular school system was found to be lacking the capability or willingness to respond to the needs of children with autism. Education opportunities for children with more severe disabilities such as autism have been largely inadequate and most of them have long been kept out of the Chinese public school system. China has thus far not developed a complete and responsive education or rehabilitation system for children with autism and there is a need to provide more holistic and complete public education service for these children

Degradation and damage behaviors of steel frame welded connections

Meng Wang,Yongjiu Shi,Yuanqing Wang,Jun Xiong,Hong Chen 국제구조공학회 2013 Steel and Composite Structures, An International J Vol.15 No.4

In order to study the degradation and damage behavirs of steel frame welded connections, two series of tests in references with different connection constructions were carried out subjected to various cyclic loading patterns. Hysteretic curves, degradation and damage behaviours and fatigue properties of specimens were firstly studied. Typical failure modes and probable damage reasons were discussed. Then, various damage index models with variables of dissipative energy, cumulative displacement and combined energy and displacement were summarized and applied for all experimental specimens. The damage developing curves of ten damage index models for each connection were obtained. Finally, the predicted and evaluated capacities of damage index models were compared in order to describe the degraded performance and failure modes. The characteristics of each damage index model were discussed in depth, and then their distributive laws were summarized. The tests and analysis results showed that the loading histories significantly affected the distributive shapes of damage index models. Different models had their own ranges of application. The selected parameters of damage index models had great effect on the developing trends of damage curves. The model with only displacement variable was recommended because of a more simple form and no integral calculation, which was easier to be formulated and embedded in application programs.

A Novel Ramp Method Based on Improved Smoothing Algorithm and Second Recognition for Windshear Detection Using LIDAR

Meng Li,Jiuzhi Xu,Xing-long Xiong,Yuzhao Ma,Yifei Zhao 한국광학회 2018 Current Optics and Photonics Vol.2 No.1

As a sophisticated detection technology, LIDAR has been widely employed to probe low-altitude windshear. Due to the drawbacks of the traditional ramp algorithm, the alarm accuracy of the LIDAR has not been satisfactory. Aiming at settling this matter, a novel method is proposed on the basis of improved signal smoothing and second windshear detection, which essentially acts as a combination of ramp algorithm and segmentation approach, involving the human factor as well as signal fluctuations. Experiments on the real and artificial signals verify our approach.

Variable Research on Engineering Characteristics of Soybean Urease Reinforced Sand

Meng Cui,Huihui Xiong,Jun-jie Zheng,Suying Lv,Mingjuan Cui,Xiao Fu,Shangyu Han 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.8

In this study, based on soybean urease and standard sand, the unconfined compressive strength test and permeability test of four variables of urease concentration, urea concentration, calcium chloride concentration and sodium alginate content under different combinations of values were carried out, and the range analysis and variance analysis of test data were carried out. On this basis, the coupling model of unconfined compressive strength and permeability coefficient of soybean urease reinforced sand was established based on four test variables. It was found that the engineering characteristics of soybean urease reinforced sand were significantly affected by the combination of variable values. The maximum value of unconfined compressive strength under the test combination condition was 6.5 times of the minimum value, and the minimum value of permeability coefficient was only 1/4 of the maximum value. The primary and secondary order of influence variables of unconfined compressive strength was: urea concentration > calcium chloride concentration > urease concentration > sodium alginate content, and the primary and secondary order of influence variables of permeability coefficient was: urea concentration > calcium chloride concentration > sodium alginate content > urease concentration. The influence of urea concentration on unconfined compressive strength and permeability coefficient was obvious, and the influence of the other three variables was not obvious. In addition, it was confirmed that the established coupling model of unconfined compressive strength and permeability coefficient of soybean urease reinforced sand had high correlation coefficient and significant linear regression, which can be used for subsequent research and engineering application.

Variation of resistance and susceptibility in wheat cultivars to different populations of Rhopalosiphum padi (Hemiptera: Aphididae) in China

Meng Zhang,Xianfeng Qiao,Xiong Peng,Maohua Chen 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.2

The bird cherry-oat aphid, Rhopalosiphumpadi (L.) (Hemiptera: Aphididae), is an important pest insect ofwheat, Triticum aestivum (L.), in China. The susceptibility and resistance of wheat cultivars to different populations of R. padi have been rarely reported. In the current study, eight R. padi populations were collected from different provinces of China, the resistance or susceptibility of six wheat cultivars (Emai 596, Emai 18, Emai 251, Zhengmai 98, Xanthus and 35A9B) to these eight populations was tested by the ratio of aphid abundance according the standard method previously reported. The results showed that R. padi populations from Lanzhou of Gansu Province and Taian of Shandong Province showed similar pattern of aphid-host reactions among the six wheat cultivars. Populations from Nanyang of Henan Province and Baicheng of Jilin Province shared a different pattern of reaction. The respective populations from Xianyang of Shaaxi Privince, Beibei of Chongqing Province, Hongtong of Shanxi Province and Baoding of Hebei Province showed unique resistance/susceptible patterns of aphid-host reactions from other populations. The variability in the response to wheat cultivars to R. padi indicated the existence of biotypic variation in populations. The weight of adult aphid survivors of different populations varied on six wheat cultivars, but did not correspond well to the susceptibility and resistance of wheat cultivars. Our findings are important for the sustainable control of R. padi in different wheat growing regions of China.

Enhancement of Signal-to-noise Ratio Based on Multiplication Function for Phi-OTDR

Meng Li,Xinglong Xiong,Yifei Zhao,Yuzhao Ma 한국광학회 2018 Current Optics and Photonics Vol.2 No.5

We propose a novel methodology based on the multiplication function to improve the signal-to-noise ratio (SNR) for vibration detection in a phi optical time-domain reflectometer system (phi-OTDR). The extreme-mean complementary empirical mode decomposition (ECEMD) is designed to break down the original signal into a set of inherent mode functions (IMFs). The multiplication function in terms of selected IMFs is used to determine a vibration’s position. By this method, the SNR of a phi-OTDR system is enhanced by several orders of magnitude. Simulations and experiments applying the method to real data prove the validity of the proposed approach.

Association Between Insulin-like Growth Factor-2 Expression and Prognosis after Transcatheter Arterial Chemoembolization and Octreotide in Patients with Hepatocellar Carcinoma

Xiong, Zheng-Ping,Huang, Fang,Lu, Meng-Hou Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.7

Objective: To investigate the association between the change of IGF-2 level in serum after transcatheter arterial chemoembolization (TACE) and hepatocellular carcinoma (HCC) progression, especially in relation to metastasis. Methods: IGF-2 in serum was measured by quantitative sandwich enzyme-linked immunosorbent assaybefore, 3 days and 4 weeks after TACE in 60 patients with HCC. The occurrence of HCC metastasis was also evaluated, 3 months after TACE. Results: (1) The average serum level of IGF-2 in the 60 patients with HCC was $136.5{\pm}87.3$ pg/ml; (2) A tendency for increase was observed with heterogenous uptake of octreotide and portal vein thrombosis. Metastatic foci were found in 37/38 patients in the group with IGF-2 increasing (97.0%), in contrast to 3/22 (13.6%) patients with IGF-2 decrease. Conclusion: The increase of IGF-2 level in serum appears to be associated with the occurrence of metastatic HCC after TACE and chemotherapy.

Effect of Replacing Corn and Wheat Bran With Soyhulls in Lactation Cow Diets on In Situ Digestion Characteristics of Dietary Dry Matter and Fiber and Lactation Performance

Meng, Qingxiang,Lu, Lin,Min, Xiaomei,McKinnon, P.J.,Xiong, Yiqiang Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.12

An in situ digestion trial (Experiment 1) and a lactation trial (Experiment 2) were conducted to determine the effects of replacing corn and wheat bran with soyhulls (SH) in lactating dairy cow diets on the extent and kinetics of digestion of DM and NDF, and lactation performance. In experiment 1, five mixed feeds consisting of mixed concentrate and roughages (50:50 on a DM basis) were formulated on isonitrogenous and isoenergetic bases to produce five levels (0, 25, 50, 75 and 100%) of SH replacement for corn and wheat bran. SH had high in situ digestion (92 and 89% for potentially digestible DM and NDF) and fairly fast digestion rate (7.2 and 6.3 %/h for DM and NDF). Increasing level of SH replacement resulted in increased NDF digestibility (linear, p=0.001-0.04) and similar DM digestibility (beyond 12 h incubation, p=0.10-0.41). As level of SH replacement increased, percentage of slowly digestible fraction (b) of DM increased (linear, p=0.03), percentage of rapidly digestible fraction (a) of DM tended to decrease (linear, p=0.14), and DM digestion lag time tended to be longer (linear, p=0.13). Percentage of potentially digestible fraction (a+b) and digestion rate (c) of slowly digestible fraction of dietary DM remained unaltered (p=0.36-0.90) with increasing SH in the diet. Increasing level of SH for replacing corn and wheat bran in the diet resulted in increases in percentages of b (quadratic, p<0.001), a (linear, p=0.08), a+b (quadratic, p=0.001) and a tendency to increase in c for NDF (linear, p<0.19). It was also observed that there was a satisfactory fit of a non-linear regression model to NDF digestion data ($R^2=0.986-0.998$), but a relatively poor fit of the model to DM digestion data ($R^2=0.915-0.968$). In experiment 2, 42 lactating Holstein cows were used in a randomized complete block design. SH replaced corn and wheat bran in mixed concentrates at 0, 25, and 50%, respectively. These mixed concentrates were mixed with roughages and fed ad libitum as complete diets. Replacing corn and wheat bran with SH at 0, 25 and 50% levels did not influence (p=0.56-0.95) DM intakes (18.4, 18.6, and 18.5 kg/d), milk yields (27.7, 28.4 and 27.6 kg/d), 4% fat-corrected-milk (FCM) yields (26.2, 27.6, and 27.3 kg/d) and percentages of milk protein (3.12, 3.17 and 3.18%), milk lactose (4.69, 4.76 and 4.68%) and SNF (8.50, 8.64, and 8.54%). On the other hand, milk fat percentges linearly increased (3.63, 3.85 and 3.90% for SH replacement rates of 0, 25 and 50% in the diet, p=0.08), while feed costs per kg FCM production were reduced.

Novel P/N/Si/S-containing Mononickel Complex as a Metal-based Intumescent Flame Retardant for Cotton Fabrics

Meng-Yuan Hu,Kuan-Kuan Xiong,Jian-Rong Li,Xing-Bin Jing,Pei-Hua Zhao 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9

A new P/N/Si/S-containing mononickel complex NiS, which can be regarded as a rare type of the metal-basedintumescent flame retardant, has been prepared through the condensation reaction of precursor NiCl with 1, 2-ethanedithiolin the presence of triethylamine as acid-binding agent. Its molecular structure is well characterized by elemental analysis,infrared (IR) and nuclear magnetic resonance (NMR) spectroscopies. The target flame retardant NiS has been successfullyapplied to cotton fabrics through a pad-dry-cure method. Thermal degradation properties of neat and treated cotton fabricswith 10.7 wt% NiS are studied by thermogravimetric analysis (TGA). Flammability behaviors of neat and treated cotton with10.7 wt% NiS are evaluated using vertical burning test, limiting oxygen index (LOI) and microscale combustion calorimeter(MCC). Meanwhile, to further investigate the flame retardancy of NiS for cotton fabrics, the char layers of neat and treatedsamples after combustion are analyzed by SEM image and Raman spectroscopy. As a result, the improved thermal andflammability performance for cotton fabrics by introduction of NiS might be due to the metal-assisted catalytic charringeffect of NiS on the formation of the compact char layer and the release of the flammable gas.