The 80% ethanol extract of Alstonia yunnanensis afforded five new monoterpenoid indole alkaloids: 11-hydroxy-6,7-epoxy-8-oxo-vincadifformine (1), 14-chloro-15-hydroxy- vincadifformine (2), perakine N4-oxide (3), raucaffrinoline N4-oxide (4), and vinorine N1,N4-dioxide (5), together with three known compounds: 11-methoxy-6,7-epoxy-8-oxo- vincadiffor
Abstract Methods Hairbands of multivariate analysis is a powerful approach to assist the initial stages of crops genetic improvement, particularly, because it allows many traits to be evaluated simultaneously.In this study, heat-tolerant genotypes have been selected by analyzing phenotypic diversity, direct and indirect relationships among traits w
A more improbable object of imperial rivalry than Wrangel Island could scarcely be found in the world.For decades in the 1800s and the early 1900s Wrangel Island became the subject of controversy among Russia, USA, Canada and Great Britain.Having about 140 km long from East to West and 80 km wide from North to South this cold, barren and inhospitab
The application of UAV-based aerial imagery has advanced exponentially in the past two decades.This can be attributed to UAV operational flexibility, ultra-high spatial resolution, inexpensiveness, and UAV-based sensors enhancement.Nonetheless, the application of multitemporal series of multispectral UAV imagery still suffers significant misregistr