Online floras provide research botanists with the opportunity to work on floristic treatments dynamically, and enable users to browse and search these treatments. A web‐based program called eFloras (URL: http://www.efloras.org/) was developed to enable access to online "electronic" floras. Through a web interface to the data, users can browse online floristic treatments by volume, family, and genus, and can search by name, distributional data, and text. With the use of web forms, editors and authors with permissions can correct and update the data.
Abstract:The arctic strain of Chlorella sp. (Chlorella-Arc) exists in the coldest and driest arctic ecosystems, and it is a new resource of active polysaccharides. The extraction of crude polysaccharide from Chlorella-Arc was optimized using the response surface methodology. A crude polysaccharide yield of approximately 9.62 ± 0.11% dry weight was obtained under these optimized conditions. Three fractions (P-I, P-II, and P-III) were present after purification by 2-diethylaminoethanol Sepharose Fast Flow and Sephadex G-100 chromatography. The P-IIa fraction demonstrated significant antioxidant activities. Moreover, P-IIa was an α-and β-type heteropolysaccharide with a pyran group and contained variable amounts of rhamnose, arabinose, glucose, and galactose based on fourier-transform infrared spectroscopy, high-performance liquid chromatography, and 1 H and 13 C nuclear magnetic resonance imaging. Production of high amounts of polysaccharide may allow further exploration of the microalgae Chlorella-Arc as a natural antioxidant.
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