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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.
Influences of Different Halophyte Vegetation on Soil Microbial Community at Temperate Salt Marsh
Chaudhary, Doongar R.,Kim, Jinhyun,Kang, Hojeong Springer-Verlag 2018 Microbial ecology Vol.75 No.3
<P>Salt marshes are transitional zone between terrestrial and aquatic ecosystems, occupied mainly by halophytic vegetation which provides numerous ecological services to coastal ecosystem. Halophyte-associated microbial community plays an important role in the adaptation of plants to adverse condition and also affected habitat characteristics. To explore the relationship between halophytes and soil microbial community, we studied the soil enzyme activities, soil microbial community structure, and functional gene abundance in halophytes- (Carex scabrifolia, Phragmites australis, and Suaeda japonica) covered and un-vegetated (mud flat) soils at Suncheon Bay, South Korea. Higher concentrations of total, Gram-positive, Gram-negative, total bacterial, and actinomycetes PLFAs (phospholipid fatty acids) were observed in the soil underneath the halophytes compared with mud flat soil and were highest in Carex soil. Halophyte-covered soils had different microbial community composition due to higher abundance of Gram-negative bacteria than mud flat soil. Similar to PLFA concentrations, the increased activities of beta-glucosidase, cellulase, phosphatase, and sulfatase enzymes were observed under halophyte soil compared to mud flat soil and Carex exhibited highest activities. The abundance of archaeal 16S rRNA, fungal ITS, and denitrifying genes (nirK, nirS, and nosZ) were not influenced by the halophytes. Abundance bacterial 16S rRNA and dissimilatory (bi)sulfite (dsrA) genes were highest in Carex-covered soil. The abundance of functional genes involved in methane cycle (mcrA and pmoA) was not affected by the halophytes. However, the ratios of mcrA/pmoA and mcrA/dsrA increased in halophyte-covered soils which indicate higher methanogenesis activities. The finding of the study also suggests that halophytes had increased the microbial and enzyme activities, and played a pivotal role in shaping microbial community structure.</P>
ACE inhibiton activity of standardized extract and fractions of Terminalia bellerica
Chaudhary, Sushil Kumar,Mukherjee, Pulok K.,Nema, Neelesh Kumar,Bhadra, Santanu,Saha, B.P. 경희한의학연구센터 2012 Oriental Pharmacy and Experimental Medicine Vol.12 No.4
The fruit of Terminalia bellerica L. (Combretaceae) is an important ingredient of 'Triphala', which is a popular Ayurvedic formulation traditionally used to treat hypertension, to reduce cardiac depression and to decreases the risk factors associated with the heart. This study aimed to investigate the angiotensin converting enzyme (ACE) inhibitory activity of T. bellerica. Standardized hydro alcoholic extract (TBHA) and its various subfractions including hexane fraction (TBH), ethyl acetate fraction (TBE), n-butanol fraction (TBB) and aqueous fraction (TBW) at the concentration of 10-1000 ${\mu}g/ml$ together with standard Captopril 3.6 ng/ml was compared. TBE fraction was undertaken to isolate the gallic acid. Further quantification of gallic acid in the crude extract and fractions was made with HPLC. Among all fractions the activity was found to be maximum in TBE with an $IC_{50}=338.54{\pm}18.34{\mu}g/ml$ while crude TBHA and other fractions TBB, TBH and TBW were found less potent. Isolated gallic acid from the TBE fraction shown ACE inhibitory activity with $IC_{50}$ of $257.29{\pm}9.39{\mu}g/ml$. TBE found to contain maximum amount of gallic acid ($71.05{\pm}6.274$ mg/g of extract). The presence of gallic acid along with other metabolites in the extract and fractions might be responsible for the ACE inhibitory activity. T. bellerica extract/fractions suggested its suitability as a functional food for pharmaceutical purpose to be used against hypertension and other related diseases.
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>
Tunable Center Frequency Negative Group Delay Filter Using Coupling Matrix Approach
Chaudhary, Girdhari,Jeong, Yongchae IEEE 2017 IEEE microwave and wireless components letters Vol.27 No.1
<P>In this letter, a negative group delay filter (NGDF) with tunable center frequencies is presented. The proposed filter is designed using finite unloaded-Qu resonators based on the coupling matrix approach. The proposed NGDF does not require a lumped resistor to generate a negative group delay and has source-load and inter-resonator couplings. The center frequency of the filter is tuned by varying the bias voltage of the varactor diodes. The design theory for the proposed filter is validated experimentally through fabrication of a second-order NGDF at a center frequency of 2.14 GHz.</P>