Study on the Brill transition of polyamide 6 with different crystal forms using low- and high-frequency Raman spectroscopy.

Polyamide 6 (PA6) in its α and γ-forms was studied from 30 to 220 °C using Raman spectroscopy in the low- and high-wavenumber regions. Quantum chemical calculations were employed to assist with band assignments. In the low-wavenumber region, a peak at approximately 100 cm, attributable to a mixed mode of methylene lateral motion and amide group stretching, was observed.

Dataset for the establishment of an age model of marine sediment core KH19-6 Leg.4 PC10/MC14 collected from the Agulhas Ridge in the South Atlantic Ocean.

A precise age model of marine sediment core is crucial for environmental studies of the past such as paleoceanography, paleoclimatology, and paleo-hazard studies. Here the geochemical dataset is described that is used to determine the age model of marine sediment cores collected from Agulhas Ridge in the South Atlantic Ocean using piston coring and multiple-coring systems during the 30th Anniversary expeditions of R/V Hakuho Maru in 2019-2020 (KH19-6 Leg.4 PC10/MC14, water depth of 4,604 m).

Does sexual dimorphism exist in flowering phenology traits in anemophilous dioecious species? A test with Rumex acetosa.

Premise: Sexual dimorphism in flowering phenology traits may have evolved under sexual selection and vector-mediated selection. The conspicuous sexual dimorphism and sex-specific selection pressures in flowering phenology traits have been investigated mainly in entomophilous dioecious plants, whereas little is known about this in anemophilous plants.

Methods: We examined sexual dimorphism in flowering onset, flowering peak, flowering duration, maximum proportion of open flowers per inflorescence branch, maximum proportion of newly opening flowers on a given date per branch, and longevity of individual flowers in natural Rumex acetosa populations.