Response of Spodoptera frugiperda (Lepidoptera: Noctuidae) to salt‐stressed maize plants

Wang Zai‐Ling,Haseeb Muhammad,Zhang Run‐Zhi 한국곤충학회 2021 Entomological Research Vol.51 No.11

Salt-stressed maize is an economically important crop in many arid and semi-arid regions of the world where soil salinization is most common, and the invasive fall armyworm (FAW) Spodoptera frugiperda threatens global maize production. It thus poses a puzzle of whether FAW populations feeding on salt-stressed maize plants are becoming more or less invasive. Here, we evaluated the FAW response to salt-stressed maize plants by examining effects of salt-stressed maize plants on FAW survival, development and fecundity. We found a longer larval development time (salt-stressed, 12.9 ± 0.8 d; non-stressed, 11.3 ± 0.4 d), but unaffected survival rate and pupal mass accumulation in FAW feeding on salt-stressed maize plants. Moreover, the lifetime egg production of FAW females feeding on salt-stressed maize plants (633.5 ± 62.7 eggs) was reduced by nearly half compared with those feeding on non-stressed maize plants (1255.9 ± 70.3 eggs). Overall, FAW showed a negative response to salt-stressed maize plants. Due to limited population increase potential, FAW populations feeding on salt-stressed maize plants should pose less of a problem than ones feeding on non-stressed maize plants do. In practice, salt-stressed maize plants are quite common in arid and semi-arid regions where the relatively high-salinity groundwater is often used to irrigate maize plants, potentially limiting FAW population size. Thus, salt-stressed maize plants would contribute to practical applications of integrated pest management (IPM) strategies in controlling FAW.

A Resonator-Adaptable Oscillator Using Varactor-Loaded Tuned Amplifiers

Wang, Yong,Hong, Yan,Goh, Wang Ling,Chai, Kevin T. C.,Je, Minkyu IEEE 2017 IEEE microwave and wireless components letters Vol.27 No.8

<P>This letter presents a new monolithic oscillatory circuit that is applicable to different microelectromechanical systems (MEMS)/crystal resonators. The proposed technique cascades tuned amplifiers (TAs) with varactors in their LC-tanks. By adjusting the bias voltage of the varactors, the center frequencies of the TAs can be controlled to change the loop response of the oscillator. Using this approach, the oscillation conditions can precisely be attained for different resonant frequencies. Tunable negative resistance is realized through biasing the MOS transistors in the TAs, so as to compensate losses from the different resonators. The TAs present bandpass characteristics that superbly suppress the overtones, thus improving the oscillator stability. Fabricated in 0.18-mu m CMOS technology, a prototype oscillator chip is able to suit a variety of resonators, offering 274- to 565-MHz frequency range, 30-dB dynamic loop gain, and -27 dB/octave roll-off to suppress all undesired frequencies. To the best of the authors' knowledge, the proposed monolithic oscillator is the first of its kind to be applicable to various MEMS resonators at above 100 MHz, which is beneficial for MEMS sensor applications, clock generations, etc.</P>

Limiting the Number of Open Projects to Shorten the NPD Schedule

Wang, Miao-Ling,Yang, Chun-I,Chang, Sheng-Hung Korean Institute of Industrial Engineers 2011 Industrial Engineeering & Management Systems Vol.10 No.1

Many companies open multiple projects simultaneously due to market trends, which results in a crowding out effect because of limited resources. R&D engineers become overloaded and scheduling of product development is delayed resulting in timing misses and lost sales leads. The company in this case study (Company A), often opens up many projects simultaneously in order to respond to market needs quickly. The engineers are overloaded and, of course, the schedule is delayed. In order to identify problems, Company A began using Dr. Goldratt's Thinking Processes (TP) during new product development (NPD). When the analysis phase of TP was completed, Company A's core problem was identified as "the quantity of kick-off projects." Consequently, new rules and conditions and procedures were proposed for the opening, suspending, stopping, and closing of projects. Finally, the "Future Reality Tree" ensured that the proposed rules, conditions and procedures were set up as an available solution approved for practical application by executives. After a one-year trial run, the results showed that the Project Duration Rate was reduced by 53%, the Project Closed Rate was increased by 140% and the Project on Time Rate was increased from 10% to 68%. The above results give significant evidence of the benefits of the proposed methodology.

Using Skylines on Wavelet Synopses for CKNN Queries over Distributed Streams Processing

Wang, Ling,Zhou, TieHua,Kim, Kwang-Deuk,Lee, Yang-Koo,Ryu, Keun-Ho Korea Spatial Information System Society 2009 한국공간정보시스템학회 논문지 Vol.11 No.2

In this paper, we discuss the problem of continuous k.nearest neighbors (CKNN) monitoring over distributed streams wavelet synopses, which also considered sliding window structure under stream based kNN query. We developed traditional skylines techniques and propose a new method which called DR.skylines to process CKNN queries as a bandwidth.efficient approach. It tries to process CKNN queries on synopses for optimized sliding window time and space computation.

In situ growth of CdSe/CdS quantum dots inside and outside of MWCNTs

Ling Wang,Minggai Niu,Zhiwei Wu 한국물리학회 2009 Current Applied Physics Vol.9 No.5

The CdSe/CdS quantum dots were grown in situ inside and outside of the multiwalled carbon nanotubes in an innocuous solvent and at a lower temperature. The CdSe/CdS-CNTs nanoheterostructures were characterized by TEM, HRTEM, EDS, XPS and PL. The CdSe/CdS nanocrystals with diameters about 5 nm exhibit an improved PL emission.

A DFT study of the geometrical structures and electronic properties of CumMn (m + n = 6, M = Fe, Co, Ni) clusters

Wang Su Juan,Zhou Dan,Hu Yan Fei,Tang Cui Ming,Wang Qiao Zhi,Chen Shun Ling 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.3

In this work, we investigated bimetallic CumMn (m + n = 6, M = Fe, Co, Ni) clusters on the basis of the density functional theory at the M06L level. While changing the structure and composition, our team studied the geometrical structures, relative stabilities and electronic magnetic moments of these clusters. We found that the average atomic binding energies vary linearly with the number of doping atoms in the CumFen and the CumNin clusters. The values of electron affinity (EA) and the ionization potential (IP) for the CumNin clusters are closer to those of pure Cu clusters compared with the others. A negative value of the EA is only seen in CumFen clusters. The electronic magnetic moments of these clusters indicate that most of them exhibit a local minimum when doped with three atoms. Moreover, we further analyzed the HOMO–LUMO gaps, the natural population, and the geometrical structures.

Enantioselective Synthesis of S-Equol from Dihydrodaidzein by a Newly Isolated Anaerobic Human Intestinal Bacterium

Wang, Xiu-Ling,Hur, Hor-Gil,Lee, Je Hyeon,Kim, Ki Tae,Kim, Su-Il American Society for Microbiology 2005 Applied and environmental microbiology Vol.71 No.1

<B>ABSTRACT</B><P>A newly isolated rod-shaped, gram-negative anaerobic bacterium from human feces, named Julong 732, was found to be capable of metabolizing the isoflavone dihydrodaidzein to <I>S</I>-equol under anaerobic conditions. The metabolite, equol, was identified by using electron impact ionization mass spectrometry, <SUP>1</SUP>H and <SUP>13</SUP>C nuclear magnetic resonance spectroscopy, and UV spectral analyses. However, strain Julong 732 was not able to produce equol from daidzein, and tetrahydrodaidzein and dehydroequol, which are most likely intermediates in the anaerobic metabolism of dihydrodaidzein, were not detected in bacterial culture medium containing dihydrodaidzein. Chiral stationary-phase high-performance liquid chromatography eluted only one metabolite, <I>S</I>-equol, which was produced from a bacterial culture containing a racemic mixture of dihydrodaidzein. Strain Julong 732 did not show racemase activity to transform <I>R</I>-equol to <I>S</I>-equol and vice versa. Its full 16S rRNA gene sequence (1,429 bp) had 92.8% similarity to that of <I>Eggerthella hongkongenis</I> HKU10. This is the first report of a single bacterium capable of converting a racemic mixture of dihydrodaidzein to enantiomeric pure <I>S</I>-equol.</P>

Efficient Similarity Search Techniques with a Real-Time Approximate Analysis in Streaming Database

Ling Wang,Tie Hua Zhou,Kyung Ah Kim,Eun Jong Cha,Keun Ho Ryu 보안공학연구지원센터 2013 International Journal of Multimedia and Ubiquitous Vol.8 No.4

Enhanced biosynthesis of dihydrodaidzein and dihydrogenistein by a newly isolated bovine rumen anaerobic bacterium

Wang, Xiu-Ling,Shin, Kwang-Hee,Hur, Hor-Gil,Kim, Su-Il Elsevier 2005 Journal of biotechnology Vol.115 No.3

<P><B>Abstract</B></P><P>A rod-shaped and Gram-positive anaerobic bacterium, named Niu-O16, which was isolated from bovine rumen contents, was found to be capable of anaerobically converting isoflavones daidzein and genistein to dihydrodaidzein (DHD) and dihydrogenistein (DHG), respectively. The metabolites DHD and DHG were identified using EI-MS and NMR spectrometric analyses. Stereoisomeric metabolites, which were separated on chiral stationary phase HPLC, were formed in equal amounts by the strain Niu-O16. Tautomerization reaction occurred on the B-ring of DHD and DHG seems to be attributed to the equal production of stereoisomeric metabolites. For the synthesis of DHD, the strain Niu-O16 showed an optimal pH range from 6.0 to 7.0 and completely reduced up to 800μM of daidzein to DHD with the initial OD<SUB>600nm</SUB>=1.0 and pH 7.0 for 3 days incubation. The strain Niu-O16, showed relatively faster reduction activity toward daidzein to produce DHD than the previously isolated human intestinal bacterium <I>Clostridium</I> sp. HGH6.</P>

Genes Regulating the ABORTED MICROSPORES (AMS)-Mediated Male Sterility Networks in Melon (Cucumis melo L.)

Ling Wang,Dong-yang Dai,Xia Wu,Yun-yan Sheng,Peng Ji,Dan-dan Li,Fan Zhang,Di Wang 한국원예학회 2021 원예과학기술지 Vol.39 No.5

The male sterile plants have higher heterosis in the production of hybrid seeds. The ABORTED MICROSPORES (AMS) gene has been demonstrated to be a candidate gene for ms-5. However, the genetic mechanism underlying AMS-mediated male sterility (MS) regulatory networks in melon (Cucumis melo L.) is still not clearly understood. In the present study, we used transcriptome sequencing analysis, yeast hybridization technology, quantitative real-time polymerase chain reaction (qRT-PCR), and bioinformatics analyzed to systematically investigate the AMS-mediated MS regulatory networks in melon. A set of 15 proteins interacting with AMS, including the C. melo L. Zinc Ribbon protein 1 (CmZR1) gene, was identified using the yeast one-hybrid (Y1H) system and further confirmed using the yeast two-hybrid (Y2H) assay. The interaction of the CmZR1 protein with the C. melo L. Pectin Methylesterase Inhibitor 1 (CmPMEI1) protein was identified and further verified by the glutathione S-transferase (GST) pull-down technique. Bioinformatics analyzed the physical and chemical properties, gene structure, and kinship of the melon PMEI family. We proposed a partial regulatory network for melon MS in which the interaction of CmPMEI1 protein with CmZR1 protein regulates the expression of the AMS gene for pollen abortion. These findings provide important information for increasing the understanding of the molecular mechanism of the MS regulatory network in melon.