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Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia  [PDF]
Dorjpalma Enkhbayar, Jieun Seo, Seon-Gyu Choi, Young Jae Lee, Enkhbayar Batmunkh
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.71003
Abstract: The Mushgai khudag volcanic-plutonic complex consists of four REE mineralization zones: carbonatite zone, apatite zone, magnetite zone, and monazite zone. REE mineralization occurs within peripheries of alkaline magmatic rocks which consist of porphyritic syenite, microsyenite and quartz syenites. Three types of LREE-rich apatite can be found in the carbonatite, apatite, and monazite zones. Crystal-1 type of apatite exists as hexagonal prismatic shape and is mostly found in the apatite zone, and in syenite. Crystal-2 type of apatite can be exposed also at the apatite zone, and carbonatite zone as brecciated massive crystalline aggregate. Crystal-3 type of apatite demonstrates the compositional zoning texture with monazite as inter-zoning, and is only found in monazite zone. The LREE-bearing apatites from the Mushgai khudag complex are mostly fluorapatite to hydroxyl-bearing fluorapatite with variable REE content. Apatites from the monazite zone present individual sulfur-rich monazite grain, and are formed by comprehensive substitutions.
Stochastic simulation of cell cycle
Purevdolgor Luvsantseren,Enkhbayar Purevjav,Khenmedeh Lochin
Advanced Studies in Biology , 2013,
Exploring Coverage and Distribution of Identifiers on the Scholarly Web
Peter Kraker,Asura Enkhbayar,Elisabeth Lex
Computer Science , 2015,
Abstract: In a scientific publishing environment that is increasingly moving online, identifiers of scholarly work are gaining in importance. In this paper, we analysed identifier distribution and coverage of articles from the discipline of quantitative biology using arXiv, Mendeley and CrossRef as data sources. The results show that when retrieving arXiv articles from Mendeley, we were able to find more papers using the DOI than the arXiv ID. This indicates that DOI may be a better identifier with respect to findability. We also find that coverage of articles on Mendeley decreases in the most recent years, whereas the coverage of DOIs does not decrease in the same order of magnitude. This hints at the fact that there is a certain time lag involved, before articles are covered in crowd-sourced services on the scholarly web.
Parametric optimization for the Lipschitz function
Ya. Lutbat,J. Enkhbayar,W. J. Hwang,R. Enkhbat
International Mathematical Forum , 2013,
Abstract: We consider the parametric minimization problem with a Lipschitzobjective function. We propose an approach for solving the originalproblem in a finite number of steps in order to obtain a solution with agiven accuraly.
Comparative sequence analysis of leucine-rich repeats (LRRs) within vertebrate toll-like receptors
Norio Matsushima, Takanori Tanaka, Purevjav Enkhbayar, Tomoko Mikami, Masae Taga, Keiko Yamada, Yoshio Kuroki
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-124
Abstract: The new method utilizes known LRR structures to recognize and align new LRR motifs in TLRs and incorporates multiple sequence alignments and secondary structure predictions. TLRs from thirty-four vertebrate were analyzed. The repeat numbers of the LRRs ranges from 16 to 28. The LRRs found in TLRs frequently consists of LxxLxLxxNxLxxLxxxxF/LxxLxx ("T") and sometimes short motifs including LxxLxLxxNxLxxLPx(x)LPxx ("S"). The TLR7 family (TLR7, TLR8, and TLR9) contain 27 LRRs. The LRRs at the N-terminal part have a super-motif of STT with about 80 residues. The super-repeat is represented by STTSTTSTT or _TTSTTSTT. The LRRs in TLRs form one or two horseshoe domains and are mostly flanked by two cysteine clusters including two or four cysteine residue.Each of the six major TLR families is characterized by their constituent LRR motifs, their repeat numbers, and their patterns of cysteine clusters. The central parts of the TLR1 and TLR7 families and of TLR4 have more irregular or longer LRR motifs. These central parts are inferred to play a key role in the structure and/or function of their TLRs. Furthermore, the super-repeat in the TLR7 family suggests strongly that "bacterial" and "typical" LRRs evolved from a common precursor.Toll-like receptors (TLRs) play a central role in innate immunity [1-3]. TLRs are type I integral membrane glycoproteins consisting of leucine rich repeat (LRR) motif in the ectodomain (ECD), and cytoplamic signaling domains known as Toll IL-receptor (TIR) domains, joined by a single trans membrane helix (Figure 1). They recognize and respond to a variety of components derived from pathogenic or commensal microorganisms principally bacteria and viruses. These molecules include lipids such as lipopolysaccharide (LPS) from Gram-negative bacteria and peptidoglycan fragments from bacterial cell walls, proteins such as flagellin and nucleic acids such as single-stranded and double-stranded RNA and unmethylated CpG DNA from bacteria or viruses. The ECDs
New Formula for the Reflection Coefficient of an Open-Ended Rectangular Waveguide with or Without an Infinite Flange
Jong-Heon Kim;Bayanmunkh Enkhbayar;Jae-Hoon Bang;Bierng-Chearl Ahn;Eun-Jong Cha
PIER M , 2010, DOI: 10.2528/PIERM10033104
Abstract: New formulas are presented for the reflection coefficient at the open end of a rectangular waveguide radiating into air including the effect of wall thickness or flange. Existing formulas require significant amount of numerical calculations and do not cover the practical range of waveguide dimensions. Reflection coefficients of open-ended standard waveguides are simulated using commercial electromagnetic software and curve-fitted to derive new formulas. Proposed formulas include the effects of waveguide wall thickness and broad-to-narrow wall aspect ratio. The accuracy of proposed formulas is compared with existing analytical, numerical and experimental results.
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