Spiegelungen in Hjelmslev'schen Kreisgeometrien

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Rate Constants for Reactions of •OH with Several Reduced Sulfur Compounds Determined by Relative Rate Constant Method

The rate constants for the reactions between •OH and six reduced sulfur compounds in air, N₂, and O₂ were measured using relative rate constant method in a 180-L Teflon bag at 298 K and 1.013×10⁵ Pa. These results were compared with previous published data and were discussed in terms of trends in different buffer gases.     

Wirkung einiger Red.-Ox.-Systeme auf Kakothelin und Methylenblau

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一类多项式系统极限环的研究

讨论了系统dxdt=(-y y2-dx)(1-y)a-x2(1-y)a-1dydt=x[(1-y)a (ax)a]极限环的存在性和唯一性,其中α为正数.     

Mikrochemic

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Cu_2O多孔纳米微球修饰电极检测NADH

将超声化学法合成的具有较大孔径和表面积的Cu_2O多孔纳米微球和Nafion膜、N,N-二甲基甲酰胺(DMF)混合滴加到玻碳电极(GC)表面,制成Cu_2O/Nafion/DMF-GC修饰电极.在pH=7.0的磷酸盐缓冲溶液(PBS)中,烟酰胺腺嘌呤二核苷酸(NADH)能在该修饰电极表面有效聚集,并在600 mV处出现灵敏的氧化峰.在不同的底液中pH值对检测影响较大,当pH=7.0时,检测效果最好,峰电流与NADH浓度在0.01～20 mmol·~(-1)范围内呈良好的线性关系,检出限为3.34 μmol·~(-1).将Cu_2O-GC和Cu_2O/Nafion/DMF-GC电极进行比较表明,Cu_2O/Nafion/DMF-GC电极具有更好的检测能力,且抗干扰性和稳定性好.     

Zur quantitativen Bestimmung von reinem Chloroform in Arzneigemischen

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In vitro study of ferromagnetic stents for implant assisted-magnetic drug targeting

Implant-assisted-magnetic drug targeting (IA-MDT) was studied in vitro using a coiled ferromagnetic wire stent made from stainless steel 430 or 304, and magnetic drug carrier particle (MDCP) surrogates composed of poly(styrene/divinylbenzene) embedded with 20 wt% magnetite. The fluid velocity, particle concentration, magnetic field strength, and stent material all proved to be important for capturing the MDCP surrogates. Overall, this in vitro study further confirmed the important role of the ferromagnetic implant for attracting and retaining MDCPs at the target zone.     

Labeling of macrophages using bacterial magnetosomes and their characterization by magnetic resonance imaging

This work investigated macrophages labeled with magnetosomes for the possible detection of inflammations by MR molecular imaging. Pure magnetosomes and macrophages containing magnetosomes were analyzed using a clinical 1.5 T MR-scanner. Relaxivities of magnetosomes and relaxation rates of cells containing magnetosomes were determined. Peritonitis was induced in two mice. T₁, T₂ and T₂* weighted images were acquired following injection of the probes. Pure magnetosomes and labeled cells showed slight effects on T₁, but strong effects on T₂ and T₂* images. Labeled macrophages were located with magnetic resonance imaging (MRI) in the colon area, thus demonstrating the feasibility of the proposed approach.