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Articles by Gang Xie
Total Records ( 6 ) for Gang Xie
  Wenhua Gao , Wei Yang , Keming Xie and Gang Xie
  In this study, a smart home system designed based on Short Message Service (SMS) and Common Gateway Interface (CGI) for embedded Linux platform was presented, just for resolving the problem of management. SMS is a new communication method who has the merits of easy development, low cost, free service and high reliability; CGI is the basic approach, by which the client can communicate with the web server. This article introduces a newly developed remote wireless control based on SMS and explains the properties and design techniques of CGI in the embedded environments. The system realizes the smart control of home appliances.
  Gang Xie and Thomas P. West
  Selected strains of the fungus Aspergillus niger were screened for their ability to produce citric acid on corn distillers` dried grains with solubles. It was determined that citric acid production by A. niger ATCC 11414 or ATCC 201122 after 240 h was higher on untreated grains than on autoclaved grains or acid-hydrolyzed grains. Methanol supplementation to the grains was only capable of stimulating citric acid production by A. niger strains ATCC 26550 and ATCC 11414. Biomass production by the selected strains after 240 h on the untreated and treated grains varied according to the strain being studied. The highest yield of citric acid was obtained for ATCC 11414 after it was supplemented with phosphate.
  Gang Xie and Thomas P. West
  Seven strains of the fungus Aspergillus niger were screened for their ability to produce citric acid on the ethanol dry milling coproduct thin stillage. Citric acid and biomass production by the fungal strains grown on the thin stillage were analyzed using an enzyme assay and a gravimetric method, respectively. Citric acid production by A. niger ATCC 9029, ATCC 9142, ATCC 10577, ATCC 12846, ATCC 26550 and ATCC 201122 was similar after 144 h of growth on thin stillage. These strains also exhibited high citric acid specific productivities and yields. Only the citric acid production, specific productivity and yield by A. niger ATCC 11414 were lower after growth on thin stillage. Biomass production by ATCC 9029 on thin stillage was the highest of the strains studied. For all strains, at least 88% of the reducing sugar concentration in the thin stillage was consumed after 144 h.
  Gang Xie and Thomas P. West
  .
  Mengyao Liu , Wesley N. Tanaka , Hui Zhu , Gang Xie , David M. Dooley and Benfang Lei
  The iron-regulated surface determinants (Isd) of Staphylococcus aureus, including surface proteins IsdA, IsdB, IsdC, and IsdH and ATP-binding cassette transporter IsdDEF, constitute the machinery for acquiring heme as a preferred iron source. Here we report hemin transfer from hemin-containing IsdA (holo-IsdA) to hemin-free IsdC (apo-IsdC). The reaction has an equilibrium constant of 10 ± 5 at 22 °C in favor of holo-IsdC formation. During the reaction, holo-IsdA binds to apo-IsdC and then transfers the cofactor to apo-IsdC with a rate constant of 54.3 ± 1.8 s–1 at 25 °C. The transfer rate is >70,000 times greater than the rate of simple hemin dissociation from holo-IsdA into solvent (ktransfer = 54.3 s–1 versus k–hemin = 0.00076 s–1). The standard free energy change, ΔG0, is –27 kJ/mol for the formation of the holo-IsdA-apo-IsdC complex. IsdC has a higher affinity for hemin than IsdA. These results indicate that the IsdA-to-IsdC hemin transfer is through the activated holo-IsdA-apo-IsdC complex and is driven by the higher affinity of apo-IsdC for the cofactor. These findings demonstrate for the first time in the Isd system that heme transfer is rapid, direct, and affinity-driven from IsdA to IsdC. These results also provide the first example of heme transfer from one surface protein to another surface protein in Gram-positive bacteria and, perhaps most importantly, indicate that the mechanism of activated heme transfer, which we previously demonstrated between the streptococcal proteins Shp and HtsA, may apply in general to all bacterial heme transport systems.
  Hui Zhu , Gang Xie , Mengyao Liu , John S. Olson , Marian Fabian , David M. Dooley and Benfang Lei
  The iron-regulated surface proteins IsdA, IsdB, and IsdC and transporter IsdDEF of Staphylococcus aureus are involved in heme acquisition. To establish an experimental model of heme acquisition by this system, we have investigated hemin transfer between the various couples of human methemoglobin (metHb), IsdA, IsdB, IsdC, and IsdE by spectroscopic and kinetic analyses. The efficiencies of hemin transfer from hemin-containing donors (holo-protein) to different hemin-free acceptors (apo-protein) were examined, and the rates of the transfer reactions were compared with that of indirect loss of hemin from the relevant donor to H64Y/V68F apomyoglobin. The efficiencies, spectral changes, and kinetics of the transfer reactions demonstrate that: 1) metHb directly transfers hemin to apo-IsdB, but not to apo-IsdA, apo-IsdC, and apo-IsdE; 2) holo-IsdB directly transfers hemin to apo-IsdA and apo-IsdC, but not to apo-IsdE; 3) apo-IsdE directly acquires hemin from holo-IsdC, but not from holo-IsdB and holo-IsdA; and 4) IsdB and IsdC enhance hemin transfer from metHb to apo-IsdC and from holo-IsdB to apo-IsdE, respectively. Taken together with our recent finding that holo-IsdA directly transfers its hemin to apo-IsdC, these results provide direct experimental evidence for a model in which IsdB acquires hemin from metHb and transfers it directly or through IsdA to IsdC. Hemin is then relayed to IsdE, the lipoprotein component of the IsdDEF transporter.
 
 
 
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