Structural characterization of the major flavonoid glycosides from Arabidopsis thaliana seeds.

Information gains from the seed of the model plant Arabidopsis thaliana (Brassicaceae) have greatly contributed to a better understanding of flavonoid synthesis and may be used for crop improvement. However, exhaustive identification of the flavonoid accumulated in Arabidopsis seed was still lacking. Complementary investigations of seed flavonoids by LC-ESI-MS, LC-ESI-MS-MS, and NMR spectroscopy in Arabidopsis led to full characterization of monoglycosides, namely, quercetin 3-O-alpha-rhamnopyranoside and kaempferol 3-O-alpha-rhamnopyranoside, and diglycosides, namely, quercetin and kaempferol 3-O-beta-glucopyranoside-7-O-alpha-rhamnopyranoside and quercetin and kaempferol 3,7-di-O-alpha-rhamnopyranoside.

[Stiffness of the knee of joint origin].

The knee usually loses its mobility following trauma, such as fracture of the femur, fracture of the upper extremity of the tibia, or fracture of the patella. We are concerned here only with joint stiffness, exclusive of any case presenting limited mobility of the knee articulation associated with retraction and/or adhesions of the entire quadriceps muscle of the femur. Forceful mobilization is strongly discouraged.