نتایج جستجو برای: spectroscopic techniques
تعداد نتایج: 669197 فیلتر نتایج به سال:
silica sulfuric acid as an efficient and reusable heterogeneous catalyst has been used for the preparation of amidines 2 from formimidate 1 by reaction with aromatic amines at room temperature in good to excellent yields. imidate was prepared by treatment of equimolar quantities of triethyl orthoformate and diaminomaleonitrile in refluxing dioxane. all the compounds were characterized fully by ...
It was previously studied that the antihistaminic chlorpheniramine elicits a biphasic response on cell growth and regulates polyamine metabolism, as described for polyamines. In part, polyamine effects on macromolecular synthesis and cell growth are attributed to nucleic acid:polyamine interactions. In this work, we have tested the hypothesis of a DNA:chlorpheniramine interaction, using fluorom...
Results of a blind test of photometric redshift predictions against spectroscopic galaxy redshifts obtained in the Hubble Deep Field with the Keck Telescope are presented. The best photometric redshift schemes predict spectroscopic redshifts with a redshift accuracy of |∆z| < 0.1 for more than 68 percent of sources and with |∆z| < 0.3 for 100 percent, when single-feature spectroscopic redshifts...
Discovered more than 40 years ago, microplastics have become a major environmental issue. With increasing global plastic production, are of growing concern. Landfills been pinpointed as primary sources to surface waters and they have, in fact, identified quantified such. Due their small size, different polymers interfering non-plastic materials, difficult analyse complex matrix such leachate. T...
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