A novel pH-sensitive chiral amphiphile, N-(4-decyloxy-2hydroxybenzylidene)-L-leucine, was synthesized. Two kinds of vesicles were found at different pH ranges, 6.5-8.0 and 11.5-12.5, and a helical structure was observed at pH ) 11.0. This unique behavior can be attributed to the formation of a dimeric structure. The interaction between this amphiphile and â-cyclodextrin was investigated by fluo...

We have examined the catalytic activity of glutathione .S'-transferases (GST) in the conjugation of busulfan with glutathione (GSH) in human liver cytosol. purified human liver GST. and cDNA-expressed GST-al-1. Human liver microsomes and cytosol were incubated with 40 /IM busulfan and 1 m\i (.SII. Cytosol catalyzed the formation of the GSH-husulfan tetrahydrothiophenium ion i III I ' i in a con...

This study was conducted to evaluate the effects of dietary forage type and concentrate-to-forage ratio (CTFR) on CH4 emissions from dairy cows in China using the SF6 tracer method. Rumen fluid concentrations of NH4-N and VFA, rumen fluid pH, and daily milk yield were measured as well. The dietary regimens included: corn stalks (dry corn stalks after corn harvest) as the forage source at CTFR o...

Objectives—Occupational asthma is the principal cause of respiratory disease in the workplace. The enzymes phytase and â-glucanase are used in the agricultural industry to optimise the nutritional value of animal feeds. A relation between these enzymes and occupational asthma in a 43 year old man was suspected. Methods—Inhalation challenge tests were performed with the enzymes phytase, â-glucan...

Major intraabdominal operations result in immunodepression.In ad dition, manipulation of malignant tumors may release tumor cells into the systemicandportal circulation. The additiveeffectsof immunodepres sion and tumor cell releaseduring surgical treatment for gastrointestinal cancer may increase the metastases of tumor to the liver. We, therefore, studied the inhibitory effect of immuiloactiv...