GC-MS combined with multivariate analysis for the determination of the geographical origin of Hemsl. in Yunnan province.

Hemsl., a Chinese herbal medicine, may have the potential to treat COVID-19. The geographical origin has a significant influence on the quality and application of In this paper, gas chromatography-mass spectrometry (GC-MS) combined with principal component analysis (PCA) and hierarchical cluster analysis (HCA) and other multivariate statistical analyses were performed for the identification of origins.

[Clinical application of prefabricated super-thin perforator flaps after expansion in the reconstruction of facial and cervical scar].

Objective: To explore a combined application of tissue expansion, perforator flaps and super-thin flaps in reconstruction of extensive face and neck scars.

Methods: In the first stage, the position and course of the perforators were confirmed with the multi-detector computed tomography ( MDCT) and color Doppler ultrasound. The expanders were implanted between subdermal vascular plexus and superficial fascia.