[Characteristics of nitrous oxide flux in spring wheat field ecosystem in Sanjiang Plain of Northeast China].

With static-closed-chamber and GC (Agilent 4890), the nitrous oxide (N2O) flux in spring wheat field ecosystem in the Sanjiang Plain of Northeast China was continuously observed in situ from May 2004 to October 2006. The results showed that the N2O flux presented obvious seasonal and inter-annual variation, which was mainly related with precipitation and field water management. The diurnal variation of N2O flux had correlations with the air temperature and the temperature at 5 cm underground.

[CO2 flux and its correlation with soil temperature in winter wheat growth season under different tillage measures].

Based on a long-term experiment, this paper investigated the CO2 flux in winter wheat growth season under different tillage measures, and simulated the correlation between the flux and soil temperature by regression method. The results indicated that under different tillage measures, the average CO2 emission rate in winter wheat growth season was in the order of moldboard plow tillage (F) > minimum tillage (X) > no-tillage (M), with the value being 343.69, 337.

[Influence of propofol and isoflurane on cytokines response to cancer surgery during perioperative period].

Objective: To compare the influence of propofol and isoflurane on pro-inflammatory and anti-inflammatory cytokine response to perioperative period of tongue cancer surgery.

Methods: Twenty-four adult patients undergone the operation of tongue cancer were assigned to two groups randomly, propofol group (Group P) and isoflurane group (Group I). In group P, anesthesia was induced with fentanyl 2-3 microg/kg, propofol 2 mg/kg, atracurium 0.

[The effect of sufentanil on acute lung injury in rabbits].

Objective: To study the effect of sufentanil on acute lung injury induced by hemorrhagic shock in rabbits.

Methods: Fifty-four healthy rabbits were randomly divided into three groups: control group,with only incision of trachea; model group, hemorrhagic shock was produced according to modified Wiggers' method; sufentanil group, intravenous injection of sufentanil at 0.02 microg x kg(-1) x h(-1) after hemorrhagic shock.

Pharmacokinetics and urinary excretion of eprosartan in Chinese healthy volunteers of different gender.

The study aims to evaluate the pharmacokinetics and urinary excretion of eprosartan in Chinese healthy volunteers and to study the effect of gender on pharmacokinetics of eprosartan. Twenty healthy volunteers (ten men and ten women) were recruited for an open trial and received a single dose of 600 mg eprosartan. Using a validated LC/MS/MS method, plasma and urinary concentrations of eprosartan were determined.

Composite nano-titanium oxide-chitosan artificial skin exhibits strong wound-healing effect-an approach with anti-inflammatory and bactericidal kinetics.

A composite nano-TiO2-chitosan with collagen artificial skin (NTCAS) showed promising characteristics of moderate water absorptivity (110 wt.-%), fine thickness (0.34 mm), low density (0.

Large-scale synthesis of single-crystalline RE2O3 (RE=Y, Dy, Ho, Er) nanobelts by a solid-liquid-phase chemical route.

Yttrium-group heavy rare-earth sesquioxide (RE(2)O(3), RE=Y, Dy, Ho, Er) nanobelts were successfully fabricated by thermolysis of solid RE(NO(3))(3)x H(2)O in a dodecylamine/1-octadecene mixed solvent system. The synthetic principle is based on separating the nucleation and growth processes by utilizing the poor solubility of RE(NO(3))(3)chi H(2)O in the solvent mixture and the heat-transportation difference between the liquid and solid. By using dodecylamine, RE(2)O(3) nanobelts can be readily obtained.

[Electrochemical oxidation of ammonia nitrogen wastewater using Ti/RuO2-TiO2-IrO2-SnO2 electrode].

Electrochemical oxidation ammonia is a new method of ammonia nitrogen wastewater treatment. A study was undertaken of electrochemical oxidation ammonia wastewater in cycle mobil-electrobath. The anode was Ti/RuO2-TiO2-IrO2-SnO2 expanded metal sheet electrode.

Single- and multiple-dose pharmacokinetics of pirfenidone, an antifibrotic agent, in healthy Chinese volunteers.

A randomized, dose-escalating study evaluated the pharmacokinetics of single and multiple oral doses of pirfenidone, a promising antifibrotic agent, in 48 healthy Chinese volunteers. The effects of sex and food on the pharmacokinetics of pirfenidone were also evaluated. Pharmacokinetics was determined from serial blood samples obtained up to 12 hours after administration of single 200-, 400-, or 600-mg doses of pirfenidone and after multiple doses of 400 mg administrated 3 times daily (tid).

[The surface adsorption and selective catalytic reaction of NO on Cu-ZSM-5 using in situ DRIFTS].

The prepared Cu-ZSM-5 catalyst presents higher activity at low temperature during the selective catalytic reduction (SCR) of NO, and the conversion from NO to N2 is 70.6% at 613 K. The in situ diffuse reflectance FTIR spectroscopy (in situ DRIFTS) is an important method for studying surface adsorption of catalyst and mechanism of catalytic reaction, and was used to study the surface adsorbed species and the selective catalytic reduction reaction of NO on Cu-ZSM-5 catalyst in the presence of propene as reductant, with excess O2 and at 298-773 K.

[Methane emission from aquatic vegetation zones of Wuliangsu Lake, Inner Mongolia].

To quantify the variations of methane fluxes from different aquatic vegetation zones, two-year measurements were measured at different aquatic vegetation zones and water depths using static chamber technique during two growing season from April to October in 2003 and 2004. Results showed that the average emission flux of CH4 from Potamogeton pectinatus (submerged macrophyte) growing zones was (3.44 +/- 1.

[Relative bioavailability of roxithromycin dispersive tablets in healthy volunteers].

The relative bioavailability of roxithromycin dispersive tablet in healthy volunteers was evaluated in this study. Its concentration in plasma was detected by high performance liquid chromatography (HPLC) after twenty healthy male volunteers were given each a single dose of 300 mg roxithromycin. The experiment data were obtained using DAS programme.

Systematic synthesis of lanthanide phosphate nanocrystals.

Uniform LnPO(4).x H(2)O (Ln=Y, La-Nd, Sm-Lu) nanocrystals that have controllable 0D (spherelike), 1D (rodlike), and 2D (polygonlike) structures have been systematically synthesized by means of a hydrothermal method by using a mixed solvent of water and ethanol. Transmission electron microscopy images and SEAD (selected area electron diffraction) patterns revealed that the products are highly crystalline and have structurally uniform shapes.

[Biotreatment of chrolobenzene-contained waste gas in trickling biofilters enhanced by SDS].

Biofitlers inoculated P. putida strain and packed respectively with ACOF and ceramic pellets were employed to purify the chlorobenzene contained gases. An anionic surfactant, sodium dodecyl sulfonate (SDS) was introduced to trickling liquid to investigate its effect on the performance of biofilters.

Search for more stable C58X18 isomers: stabilities and electronic properties of seven-membered ring C58X18 fullerene derivatives (X = H, F, and Cl).

Stimulated by recent preparation and characterization of the first C58F18 fullerene derivative, with a heptagon in the framework (Science, 2005, 309, 278), we have performed systematic density functional studies on the stabilities and electronic properties of two different structures C58X18 (A) and C58X18 (B), where X = H, F, and Cl. The large energy gaps between the highest occupied molecular orbitals and the lowest unoccupied molecular orbitals (between 2.64 and 3.

Celiprolol, a selective beta1-blocker, reduces the infarct size through production of nitric oxide in a rabbit model of myocardial infarction.

Background: It is still unclear whether celiprolol, a beta(1)-selective blocker, reduces myocardial infarct size. This study will examine whether celiprolol reduces myocardial infarct size, as well as investigate the mechanisms for its infarct size-reducing effect in rabbits.

Methods And Results: Japanese white rabbits underwent 30 min of ischemia and 48 h of reperfusion.

[Electro-flotation using in solid-liquid separation of activated sludge].

The separation of suspended solids (SS) from activated sludge was carried out in an electro-flotation cell which has two sets of electrodes,three Ti/RuO2-IrO2-TiO2 anodes and three Ti screen cathodes. The effect of operating parameters on the performance of the electro-flotation system was examined. The parameters investigated were hydraulic retention time (HRT), current density, initial SS concentration and initial pH.

[Study of on-board emission measurement for heavy-duty diesel vehicle and its impact with load].

Real world vehicle emission tests were conducted on two heavy-duty diesel trucks on un-loaded and loaded condition by using a portable emission measurement system. By analysis, the results indicate high fuel consumption and emission rates are concentrated on the high speed and acceleration areas of the speed-acceleration emission maps and the areas are much wider on loaded condition. The impact of load on fuel use and emissions will be highest while the vehicle is cruising or accelerating on (30 +/- 2.

[Research on substrate transformation mechanism in A2/O process].

Based on a laboratory-scale anaerobic-anoxic-oxic process acclimated with real wastewater, substrate transformation mechanism and the effect of nitrate on substrate transformations occurred in the system were investigated. The results indicated that under the anaerobic condition without nitrate, phosphorus-accumulating organisms (PAOs) could take up 51% of COD consumed and store them to PHAs; anoxic and aerobic specific phosphorus uptake rates were 3.87 mg/(g x h) and 6.

[Permeate flux and membrane fouling controlling of a membrane bioreactor with gravity flow to treat domestic sewage and landfill leachate].

A novel membrane bioreactor (MBR) with gravity flow was applied to treat domestic sewage and landfill leachate. The variation of permeate flux and its impact factors were studied. The long-term test showed that the average permeate flux of this MBR couldbe 11.

[Release profile of compound liposomes entrapped with vincristine sulfate and mitoxantrone chlorhydric acid in vitro and their distribution in mice].

Aim: To study on the release profile in vitro and biodistribution in mice of the compound liposomes carried with vincristine sulfate (VCR) and mitoxantrone chlorhydric acid (MTO).

Methods: The release behaviors of the VCR and MTO from compound liposomes were studied in vitro. HPLC was developed for the determination of the contents of VCR and MTO in tissues in mice.

[Pharmacokinetics of mycophenolic acid in Chinese patients with liver transplant].

Aim: To investigate the pharmacokinetics of mycophenolic acid (MPA), an active metabolite of mycophenolate mofetil (MMF) in Chinese adult liver transplant patients.

Methods: Thirty-eight liver transplant patients (male 30, female 8) receiving MMF 1.0 g, twice daily in accordance with the recommended regimen were included in this study.

Interactions between diperoxovanadate complex and amide ligands in aqueous solution.

Multinuclear ((1)H, (13)C, (14)N, and (51)V) NMR spectroscopy has been used to study the reactions between the diperoxovanadate complex K(3)[OV(O(2))(2)(C(2)O(4))] x H(2)O (abbr. bpV(ox)) and ethylenediamine or diethylamine in aqueous solution. The interaction between bpV(ox) and diethylamine was very weak and no new complex was formed.

Caution to HPLC analysis of tricarbonyl technetium radiopharmaceuticals: an example of changing constitution of complexes in column.

Radio-HPLC is a powerful tool for analyzing radioactive species in radiopharmaceutical chemistry. In this paper, we found an example that the commonly used eluting solvent, acetonitrile, could coordinate with the popular radiopharmaceutical nuclides, technetium-99m, during chromatography. [(99m)Tc(CO)(3)(H(2)O)(3)](+) and [Re(CO)(3)(H(2)O)(3)](+) showed quite different retention time when they were eluted using acetonitrile/water as mobile phase.

Do the lungs contribute to propofol elimination in patients during orthotopic liver transplantation without veno-venous bypass?

Background: The clearance of propofol is very rapid, and its transformation takes place mainly in the liver. Some reports indicated extrahepatic clearance of the drug and that the lungs are the likely place where the process occurs. This study was undertaken to compare the plasma concentrations of propofol both in the pulmonary and radial arteries after constant infusion during the dissection, anhepatic and reperfusion phases of orthotopic liver transplantation (OLT) without veno-venous bypass, attempting to investigate extrahepatic clearance and to determine whether the human lungs take part in the elimination of propofol.