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NOTE ON SOME CHARACTER FORMULAS
Chaudhary, Mahendra Pal,Chaudhary, Sangeeta,Choi, Junesang The Honam Mathematical Society 2016 호남수학학술지 Vol.38 No.4
Chaudhary and Choi [7] presented 14 identities which reveal certain interesting interrelations among character formulas, combinatorial partition identities and continued partition identities. In this sequel, we aim to give slightly modified versions for 8 identities which are chosen among the above-mentioned 14 formulas.
NOTE ON SOME CHARACTER FORMULAS
( Mahendra Pal Chaudhary ),( Sangeeta Chaudhary ),( Junesang Choi ) 호남수학회 2016 호남수학학술지 Vol.38 No.4
Chaudhary and Choi [7] presented 14 identities which reveal certain interesting interrelations among character formulas, combinatorial partition identities and continued partition identities. In this sequel, we aim to give slightly modified versions for 8 iden- tities which are chosen among the above-mentioned 14 formulas.
Tightly regulated and high level expression vector construction for Escherichia coli BL21 (DE3)
Chaudhary, A.K.,Lee, E.Y. Korean Society of Industrial and Engineering Chemi 2015 Journal of industrial and engineering chemistry Vol.31 No.-
A 474-bp ds-DNA linker-A containing all bio-parts was designed to construct tightly inducible expression vector, pNB1, for Escherichia coli. The cymR repressor expressed constitutively under pGapA promoter binds cumate operator, thus repressing the expression of target gene under T7 promoter. The potential of pNB1 was evaluated by comparing the fluorescence of green fluorescence proteins (GFP) in pNB1 and other expression system induced with cumate and isopropyl β-d-1-thiogalactopyranoside (IPTG), respectively. Compared to IPTG, cumate was found to be less toxic to bacterial cells with 2.5-fold increment in GFP expression. In addition, pNB1 was efficient in expressing GFP at low temperature.
Dyella agri sp. nov., isolated from reclaimed grassland soil
Chaudhary, Dhiraj Kumar,Kim, Jaisoo Microbiology Society 2017 International journal of systematic and evolutiona Vol.67 No.10
<P>A novel strain, DKC-1(T), was isolated from reclaimed grassland soil and was characterized taxonomically by a polyphasic approach. Strain DKC-1(T) was a Gram-staining-negative, light-yellow-coloured and rod shaped bacterium, motile with polar flagellum. It was able to grow at 20-37 degrees C, at pH 4.5-9.0 and with 0-3 % (w/v) NaCl concentration. Based on the 16S rRNA gene sequence analysis, strain DKC-1T formed a Glade within the members of the genus Dyella and showed highest sequence similarities to Dyella japonica XD53(T) (98.36 %), Rhodanobacter aciditrophus sjH1(T) (97.92 %), Rhodanobacter koreensis THG-DD7(T) (97.74 %), Dyella kyungheensis THG-B117(T) (97.65 %) and Rhodanobacter terrae GP18-1(T) (97.40 %). The only respiratory quinone was ubiquinone-8. The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and phosphatidyl-N-methylethanolamine. The predominant fatty acids of strain DKC-1(T) were iso-C-16:0, iso-C-15:0, summed feature 9 (iso-C-17:1 omega 9c and/or C-16:0 10-methyl), iso-C-17:0, iso-C-11:0 3-OH and iso-C-11:0. The genomic DNA G+C content of this novel strain was 63.1 mol%. The DNA DNA relatedness between strain DKC-1(T) and its reference strains (a japonica XD53(T), R. aciditrophus sjH1(T), R. koreensis THG-DD7(T), a kyungheensis THG-B117(T) and R. terrae GP18-1(T)) was 52.3, 44.7, 38.7, 49.0 and 32.7 %, respectively, which falls below the threshold value of 70 % for the strain to be considered as novel. The morphological, physiological, chemotaxonomic and phylogenetic analyses clearly distinguished this strain from its closest phylogenetic neighbours. Thus, strain DKC-1(T) represents a novel species of the genus Dyella, for which the name Dyella agri sp. nov. is proposed. The type strain is DKC-1(T) (=KEMB 9005-57(T)=KACC 191 76(T)=JCM 31925(T)).</P>
Harmonic Suppressed Dual-Band Bandpass Filters With Tunable Passbands
Chaudhary, G.,Yongchae Jeong,Jongsik Lim IEEE 2012 IEEE transactions on microwave theory and techniqu Vol.60 No.7
<P>This paper presents a novel approach to the design of tunable dual-band bandpass filter with broadband harmonic suppression characteristics. The proposed filter structure offers the possibility of two tunable passbands, as well as a fixed first passband and controllable second passband. The tunable passband frequency usually causes a shift of the harmonics, which need to be suppressed to improve out-of the passband characteristics. In order to suppress the harmonics over a broad bandwidth, defected ground structures are used at input and output feeding lines without degrading the passbands characteristics. Both theory and experiment are provided to validate the proposed filter. From the experimental results, it is found that the proposed filter exhibits a first passband center frequency tunable range of 34.14% from 0.85 to 1.2 GHz with the almost constant 3-dB fractional bandwidth (FBW) of 13% and second passband center frequency tunable range of 41.81% from 1.40 to 2.14 GHz with the 3-dB FBW of 11%. The measured results of the proposed filters show a rejection level of 20 dB up to more than ten times of second passband frequency can be obtained, thereby ensuring broad harmonics rejection characteristics without degradation of passbands. The measurement data have good agreement with the simulation.</P>
In‐band phase deviation minimization method for wideband tunable phase shifter
Chaudhary, Girdhari,An, Boram,Jeong, Yongchae John Wiley Sons, Inc. 2019 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.61 No.2
<P><B>Abstract</B></P><P>This article provides a novel approach to analyze and design wideband tunable reflection‐type phase shifter (RTPS) with low in‐band phase deviation (IBPD) error. The proposed RTPS consists of coupled lines where through and coupled ports are terminated with varactor diodes. The coupled lines can minimize the parasitic elements of varactor diode to achieve high phase shift range (PSR). In addition, the measured frequency‐dependent capacitance of varactor diode was used in the analytical analysis to obtain minimum IBPD error and high PSR. For experimental demonstration, phase shifter was fabricated at the center frequency of 2.5 GHz. The measured results show that the fabricated circuit achieved 126.85° PSR with ±6.48° IBPD error for 500 MHz bandwidth (BW). In addition, the measured maximum insertion loss variation and input/output return losses are within ±0.34 dB and higher than 16.85 dB within 500 MHz BW, respectively.</P>