In this study, five derivatives of sanguinarine (1) and chelerythrine (2) were prepared, with 1 2 as starting materials, by reduction, oxidation nucleophilic addition to the iminium bond C=N+. The structures all compounds elucidated on account their MS, ¹H-NMR ¹³C-NMR data. antibacterial activities screened, using Staphylococcus aureus, Escherichia coli, Aeromonas hydrophila Pasteurella multocida test bacteria. minimum bacteriostatic concentration bactericidal active determined turbidity...

This paper summarizes experimental studies on wetting-induced collapsibility in loess using single-oedometer, double-oedometer, and triaxial wetting tests. Artificially structural samples with interparticle bonding calcite (CaCO 3 ) a large void ratio were tested the laboratory to avoid sampling disturbance of natural loess. The comparison between single- double-oedometer tests confirms that deformation is independent sequence loading. conventional apparatus was enhanced for investigating...

Alpha-glucosidase inhibitors currently form an important basis for developing novel drugs diabetes treatment. In our preliminary tests, the ethyl acetate fraction of Phlomis tuberosa extracts showed significant α-glucosidase inhibitory activity (IC₅₀ = 100 μg/mL). present study, a combined method using Sepbox chromatography and thin-layer (TLC) bioautography was developed to probe further. The P. separated into 150 individual subfractions within 20 h chromatography. Then, under guidance TLC...

Loess soils undergo collapse when the material is loaded and wetted, which leads to engineering problems disasters. To understand better mechanisms that govern loess loess-like deposits under complex stress paths, a distinct element model has been established. A contact considering water content effect introduced for structural was used cement contacted particles together simulate unsaturated biaxial compression conditions. The numerical tested different wetting loading i.e., loading-quick...

Natural loess with large voids and weakly bonded structures is widespread in the arid areas of world, particularly northwestern China. Recent experimental studies have shown that mechanical behavior natural stress path dependent. In practice, soils influenced by construction earthen may undergo various complex paths are very different from conventional commonly considered geolaboratory experiments. Because limitations current technologies, real difficult to obtain field tests or physical...

This paper presents a numerical investigation into the macromechanical and micromechanical behavior of unsaturated structural loess under constant stress increment ratio compression using distinct-element method (DEM). Loess is typically kind clayey silt with metastable structure composed interparticle bonding large voids. To represent bonding, published bond contact model proposed by authors was used. Three samples different water contents were tested six incremental ratios to study...

Two new compounds 6,7-dimethoxy-2-[2-(2'-hydroxyphenyl)ethyl]chromone (1) and 6,7-dimethoxy-2-[2-(4'-hydroxyphenyl)ethenyl]chromone (2), together with ten known 2-(2-phenylethyl)chromones (3-12) were isolated from the resinous wood of Aquilaria sinensis (Lour.) Gilg. Their structures elucidated by detailed IR, MS, NMR spectroscopic analyses, comparison reported. The absolute configuration 3 was confirmed Cu Kα X-ray crystallographic experiment, data firstly Compounds 2, 8, 10, 11 exhibited...

The interferometer for emission and solar absorption (INTESA) is an infrared spectrometer designed to study radiative transfer in the troposphere lower stratosphere from a NASA ER-2 aircraft. Fourier-transform (FTS) operates 0.7 50 mum with resolution of cm(-1). FTS observes atmospheric thermal multiple angles above below A heliostat permits measurement spectra. INTESA's calibration system includes three blackbodies permit in-flight assessment radiometric error. Results suggest that accuracy...

The ongoing scientific debate regarding the role of water vapor feedback in climate change centers on effects vertical distribution and variation with change. temperature lapse rate is another vertically dependent variable; its combination interaction have an even greater potential for influencing climate. Here we examine dependence feedbacks, as presently observed mid‐latitude seasonal cycle, by means a radiative‐convective model climatological rates. It found that both feedbacks are...

Abstract General circulation models (GCMs) designed for projecting climatic change have exhibited a wide range of sensitivity. Therefore, projected surface warming with increasing CO2 varies considerably depending on which model is used. Despite notable advances in computing power and modeling techniques that occurred over the past decade, uncertainties sensitivity not been reduced accordingly. The issue investigated by examining two GCMs very different sensitivity, attention focused how...

To counter the harmful impacts of agricultural chemicals on environment and human health, there is an increasing demand for safe, eco-friendly, potent plant-based biopesticides. In this study, we aimed to investigate antimicrobial effects ginger essential oil selected volatile compounds (linalool, eugenol, citral, cinnamaldehyde [CA]) against Fusarium oxysporum FOX-1. Minimum inhibitory concentrations (MICs) were determined using mycelium growth inhibition method. The compound CA exhibited...

As established in previous studies, and analyzed further herein for the years 1988–1998, warm advection from North Atlantic is predominant control of surface‐air temperature northern‐latitude Europe late winter. This thesis supported by substantial correlation Cti between speed southwesterly surface winds over eastern Atlantic, as quantified a specific Index Ina, 2‐meter level Ts central ( 48–54°N; 5–25°E), January, February early March. In mid‐March subsequently, drops drastically (quite...