Convallaria
نویسندگان
چکیده
منابع مشابه
Provenancing Flower Bulbs by Analytical Fingerprinting: Convallaria Majalis
The origin of agricultural products is gaining in appreciation while often hard to determine for various reasons. Geographical origin may be resolved using a combination of chemical and physical analytical technologies. In the present case of Lily of the Valley (Convallaria majalis) rhizomes, we investigated an exploratory set of material from The Netherlands, three other European (EU) countrie...
متن کاملMaximal force characteristics of the Ca(2+)-powered actuator of Vorticella convallaria.
The millisecond stalk contraction of the sessile ciliate Vorticella convallaria is powered by energy from Ca(2+) binding to generate contractile forces of ∼10 nN. Its contractile organelle, the spasmoneme, generates higher contractile force under increased stall resistances. By applying viscous drag force to contracting V. convallaria in a microfluidic channel, we observed that the mechanical f...
متن کاملPower-limited contraction dynamics of Vorticella convallaria: an ultrafast biological spring.
Vorticella convallaria is one of the fastest and most powerful cellular machines. The cell body is attached to a substrate by a slender stalk containing a polymeric structure-the spasmoneme. Helical coiling of the stalk results from rapid contraction of the spasmoneme, an event mediated by calcium binding to a negatively charged polymeric backbone. We use high speed imaging to measure the contr...
متن کاملDetermination of progesterone in vegetative organs and cell organelles of Convallaria majalis L. by radioimmunoassay.
Progesterone was extracted from leaves and subterranean parts of Convallaria majalis L. and quantified by radioimmunoassay. During the stage of flowering the content of progesterone in rhizomes was by a factor of four higher than in leaves and by a factor of ten higher than in roots, whereas five weeks later the level of progesterone was unchanged in rhizomes and roots but was elevated in the l...
متن کاملSteroidal Glycosides from Convallaria majalis Whole Plants and Their Cytotoxic Activity
Phytochemical examination of Convallaria majalis (Liliaceae) whole plants yielded 15 steroidal glycosides (1-15), including nine new compounds (4-6, 10-15) with a lycotetrose unit. The structures of the new compounds were determined using two-dimensional Nuclear magnetic resonance (NMR) analyses and chemical methods. The isolated compounds were evaluated for cytotoxicity against HL-60 human pro...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1885
ISSN: 0036-8733
DOI: 10.1038/scientificamerican07111885-7941supp