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Search Results: 1 - 10 of 37333 matches for " Yi Xing "
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A two-dimensional electrophoresis reference map of the earthworm Eisenia fetida  [PDF]
Xing Wang, Yi Zhang, Zhenjun Sun
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.411115
Abstract: The molecular mechanisms underlying innate immunity in the earthworm E. fetida remain unclear. For the recognition of innate immunity in the earthworm E. fetida, a detailed knowledge of this proteome is a prerequisite. The absence of a high-resolution E. fetida proteome map prompted us to determine E. fetida protein spots that can be visualised on 2-D protein gels. In this study, we present a preliminary description of the whole earthworm E. fetida proteome. A highly detailed two-dimensional gel electrophoresis (2-DE) map of the E. fetida proteome was established and approximately 1500 protein spots were detected from the earthworm sample when applying a 500 μg protein 2-DE in the pH range 3.0 - 10.0. We present a 2-DE proteome map of E. fetida, identifying 76 different proteins by matrix-assisted laser desorption/ionization-tandem time of flight mass spectrometry (MALDI-TOF/ TOF-MS) analysis. These identified proteins, including heat shock protein 90 (Hsp90), chaperonine protein HSP60, caspase-8, fibrinolytic protease 0, gelsolin-like protein, lombricine kinase, coelomic cytolytic factor1 (CCF 1), manganous superoxide dismutase (MnSOD), triosephosphate isomerase, extracellular globin-4, lysenin, and intermediate filament protein, glyceraldehyde-3- phosphate dehydrogenase, et al., are involved in several processes, including transcripttion, translation, the tricarboxylic acid cycle, the cellular amino acid metabolic process, protein amino acid phosphorylation, glycolysis, and the glucose metabolic process. These 2-DE data will enhance future comparisons of immunity, toxicology, biotic processes and other challenges, thereby allowing for further study of the molecular mechanisms in response to environmental stressors, and it will be useful to investigate environmental proteomics in invertebrate earthworms.
Negative selection pressure against premature protein truncation is reduced by both alternative splicing and diploidy
Yi Xing, Christopher Lee
Genome Biology , 2004, DOI: 10.1186/gb-2004-5-6-p12
Abstract:
Evidence of functional selection pressure for alternative splicingevents that accelerate evolution of protein subsequences
Yi Xing, Christopher Lee
Genome Biology , 2005, DOI: 10.1186/gb-2005-6-5-p8
Abstract: Additional data file 1.
Some new results for BVPs of first-order nonlinear integro-differential equations of volterra type
Xing Yepeng,Fu Yi
Advances in Difference Equations , 2011,
Abstract: In this work we present some new results concerning the existence of solutions for first-order nonlinear integro-differential equations with boundary value conditions. Our methods to prove the existence of solutions involve new differential inequalities and classical fixed-point theorems. MR(2000)Subject Classification. 34D09,34D99.
Searching for $γ$-Ray Pulsars among Fermi Unassociated Sources: 2FGL J1906.5+0720
Yi Xing,Zhongxiang Wang
Physics , 2014, DOI: 10.1093/pasj/psu047
Abstract: We report the results from our analysis of the \textit{Fermi} Large Area Telescope data of the \textit{Fermi} unassociated source 2FGL J1906.5$+$0720, which is a high-ranked candidate pulsar. In order to better study our target, we first update the ephemeris for PSR J1907$+$0602, which is used to help remove any possible contamination due to strong emission from this nearby pulsar. From our analysis, 2FGL J1906.5$+$0720 is confirmed to have a significant low energy cutoff at $\sim$ 1~GeV in its emission (14$\sigma$--18$\sigma$ significance), consistent with those seen in young pulsars. We search for pulsations but no spin frequency signals are found in a frequency range of 0.5--32 Hz. No single model can fully describe the source's overall \fermi\ $\gamma$-ray spectrum, and the reason for this is the excess emission detected at energies of $\geq$4 GeV. The high-energy component possibly indicates emission from a pulsar wind nebula, when considering 2FGL J1906.5$+$0720 as a young pulsar. We conclude that 2FGL J1906.5$+$0720 is likely a pulsar based on the emission properties we have obtained, and observations at other energies are needed in order to confirm its pulsar nature.
Discovery of Gamma-Ray Orbital Modulation in the Black Widow PSR J1311-3430
Yi Xing,Zhongxiang Wang
Physics , 2015, DOI: 10.1088/2041-8205/804/2/L33
Abstract: We report our discovery of orbitally modulated $\gamma$-ray emission from the black widow system PSR J1311-3430. We analyze the \textit{Fermi} Large Area Telescope data during the offpulse phase interval of the pulsar, and find the orbital modulation signal at a $\sim$3$\sigma$ confidence level. Further spectral analysis shows no significant differences for the spectra obtained during the bright and faint orbital phase ranges. A simple sinusoid-like function can describe the modulation. Given these properties, we suggest that the intrabinary $\gamma$-ray emission arises from the region close to the companion and the modulation is caused by the occultation of the emitting region by the companion, similar to that is seen in the transitional millisecond pulsar binary (MSP) PSR J1023+0038. Considering the X-ray detection of intrabinary shock emission from eclipsing MSP binaries recently reported, this discovery further suggests the general existence of intrabinary $\gamma$-ray emission from them.
Phase Drifts of Sub-pulses during the 2004 Giant Flare of SGR 1806-20 and Settling of the Magnetic Fields
Yi Xing,Wenfei Yu
Physics , 2010, DOI: 10.1088/0004-637X/729/1/1
Abstract: We analyzed the observations of SGR 1806-20 performed with the \textit{Rossi X-ray Timing Explorer} (RXTE) during its 2004 giant flare. We studied the phase evolution of the sub-pulses identified in the X-ray waveform and found that the sub-pulses varied in phase with time and then gradually settled, which might indicate drifts of the emission regions in relative to the neutron star surface, or changes in the local emission geometry before the magnetic field became stable. The characteristic e-folding timescale of the phase drifts measured starting about 15 s following the initial flux spike are in the range between 37 s and 84 s. This leads to the first measurements of the characteristic timescale for the magnetic field of the neutron star to settle after a field reconfiguration during the giant flare.
Search for gamma-ray emission from four accreting millisecond pulsars with Fermi/LAT
Yi Xing,Zhongxiang Wang
Physics , 2012, DOI: 10.1088/0004-637X/769/2/119
Abstract: We report our search for \gamma-ray emission in the energy range from 100 MeV to 300 GeV from four Accreting Millisecond Pulsars (AMPs), SAX J1808.4-3658, IGR J00291+5934, XTE J1814-338, and XTE J0929-314. The data are from four-year observations carried out by Large Area Telescope (LAT) onboard the Fermi \gamma-ray Space Telescope. The AMPs were not detected, and their \gamma-ray luminosity upper limits we obtain are 5.1*10^33 ergs/s for SAX J1808.4-3658, 2.1*10^33 ergs/s for IGR J00291+5934, 1.2*10^34 ergs/s for XTE J1814-338, and 2.2*10^33 ergs/s for XTE J0929-314. We compare our results with \gamma-ray irradiation luminosities required for producing optical modulations seen from the companions in the AMPs, which has been suggested by Takata et al. (2012), and our upper limits have excluded \gamma-ray emission as the heating source in these systems except XTE J0929-314, the upper limit of which is not deep enough. Our results also do not support the model proposed by Takata et al. (2012) that relatively strong \gamma-ray emission could arise from the outer gap of a high-mass neutron star controlled by the photon-photon pair-creation for the AMPs. Two AMPs, SAX J1808.4-3658 and IGR J00291+5934, have the measurements of their spin-down rates, and we derive the upper limits of their \gamma-ray conversion efficiencies, which are 57% and 3%, respectively. We discuss the implications to the AMP systems by comparing the efficiency upper limit values with that of 20 \gamma-ray millisecond pulsars (MSP) detected by Fermi and the newly discovered transitional MSP binary J1023+0038.
Fermi Observation of the transitional pulsar binary XSS J12270-4859
Yi Xing,Zhongxiang Wang
Physics , 2014, DOI: 10.1088/0004-637X/808/1/17
Abstract: Because of the disappearance of its accretion disk since the time period around 2012 November--December, XSS J12270-4859 has recently been identified as, in addition to PSR J1023+0038, another transitional millisecond pulsar binary. We have carried out detailed analysis of the Fermi Large Area Telescope data for the binary. While both spectra before and after the disk-disappearance transition are well described by an exponentially cut-off power law, typical for pulsars' emission in the Fermi's 0.2-300 GeV, a factor of 2 flux decrease related to the transition is detected. A weak orbital modulation is seen, but only detectable in the after-transition data, same to that found at X-rays. In the long-term light curve of the source before the transition, a factor of 3 flux variations are seen. Comparing to the properties of J1023+0038, we disucss the implications from these results. We suggest that since the modulation is aligned with that at X-rays in orbital phase, it possibly arises due to the occultation of the gamma-ray emitting region by the companion. The origin of the variations in the long-term light curve is not clear, because the source field also contains unidentified radio or X-ray sources and their contamination can not be excluded. Multi-wavelength observations of the source field will help identify the origin of the variations by detecting any related flux changes from the in-field sources.
Effect of Spinning Magnetic Ferrite on the Exclusion Zone  [PDF]
Yi Zhou, Xing Wen, Alexandr A. Shpilman, Quansheng Ren
Journal of Biosciences and Medicines (JBM) , 2017, DOI: 10.4236/jbm.2017.512001
Abstract:
Colloidal and molecular solutes in suspension are excluded from the vicinity of various hydrophilic surfaces, leaving an exclusion zone (EZ) of hundreds of micrometers. Such exclusion zones were observed in the vicinity of many types of surface including artificial and natural hydrogels, biological tissues as well as hydrophilic polymers. Old studies have shown that the near-surface exclusion zone expands extensively in the presence of incident radiant energy, especially the infrared light. Developments of electromagnetic biology and quantum biology indicate that electron and nuclear spin may have a direct impact on the biological process. Inspired by these researches, the effects of spinning magnetic ferrite on EZ were studied. It is shown that spinning magnetic ferrite profoundly expands these zones in an irreversible manner.
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