scholarly journals The protection of Salicornia rubra from ultraviolet radiation by betacyanins and phenolic compounds

2021 ◽  
Author(s):  
Katherine Jensen ◽  
Roger T. Koide
Keyword(s):  
Phenolic Compounds ◽  
Ultraviolet Radiation

scholarly journals The influence of brown algae alginates on phenolic compounds capability of ultraviolet radiation absorption in vitro

2007 ◽  
Vol 55 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Leonardo Tavares Salgado ◽  
Rodrigo Tomazetto ◽  
Leonardo Paes Cinelli ◽  
Marcos Farina ◽  
Gilberto Menezes Amado Filho
Keyword(s):  
Phenolic Compounds ◽  
Ultraviolet Radiation ◽  
Brown Algae ◽  
Absorption Capacity ◽  
Uv Absorption ◽  
Radiation Absorption ◽  
Electromagnetic Spectrum ◽  
Cell Wall Polysaccharides ◽  
Physiological Processes

Brown algae phenolic compounds (PC) are secondary metabolites that participate in many biological processes, such as ultraviolet radiation (UV) protection, polyspermy blocking and trace metals bounding. Recently, PC has also been studied due to possible interactions with cell wall polysaccharides. However, there are few evidences of these interactions and their influence in physiological processes. The interactions between PC from the brown alga Padina gymnospora and alginates and the influence of these interactions on the UV absorption properties of PC were investigated in this work. Chromatography and spectrophotometry techniques were used to isolate, characterize and determine UV absorption capacity of studied compounds. Even after the P. gymnospora polysaccharide extraction and isolating methods, the PC was maintained linked to the alginate. The interaction of alginates with PC did not cause modifications on absorbance pattern of electromagnetic spectrum (UV-VIS-IR). The UV absorbance capability of PC linked to alginate was maintained for a longer period of time if compared with the purified PC. The obtained results reveal the strong linkage between PC and alginates and that these linkages preserve the UV absorption capability of PC along time.

First Data on the Effects of Ultraviolet Radiation on Phenolic Compounds in the Model HornwortAnthoceros agrestis

2018 ◽  
Vol 39 (2) ◽  
pp. 201-211 ◽  
Author(s):  
Gonzalo Soriano ◽  
María-Ángeles Del-Castillo-Alonso ◽  
Laura Monforte ◽  
Encarnación Núñez-Olivera ◽  
Javier Martínez-Abaigar
Keyword(s):  
Phenolic Compounds ◽  
Ultraviolet Radiation

Phenolic compounds from different bryophyte species and cell compartments respond specifically to ultraviolet radiation, but not particularly quickly

2019 ◽  
Vol 134 ◽  
pp. 137-144 ◽  
Author(s):  
Gonzalo Soriano ◽  
María-Ángeles Del-Castillo-Alonso ◽  
Laura Monforte ◽  
Encarnación Núñez-Olivera ◽  
Javier Martínez-Abaigar
Keyword(s):  
Phenolic Compounds ◽  
Ultraviolet Radiation ◽  
Cell Compartments

scholarly journals Phenolic Compounds in the Built Environment

2021 ◽  
Author(s):  
Elham H. Fini ◽  
Shakiba Ayat ◽  
Farideh Pahlavan
Keyword(s):  
Phenolic Compounds ◽  
Solar Radiation ◽  
Built Environment ◽  
Ultraviolet Radiation ◽  
Molecular Interactions ◽  
Environmental Fate ◽  
Treatment Methods ◽  
Intense Solar Radiation

This chapter examines source and application of phenolic compounds in the built environment as well as their environmental fate and treatment methods. We further describe the role of phenolic compounds in delaying aging and degradation of outdoor construction elements when exposed to intense solar radiation. In this chapter both plant-based and synthetic sources of phenolic compounds and their fate in the environment were examined. In addition, merits of select sources of phenolic compounds to resist ultraviolet radiation in composites as well as delaying degradation were studied. This chapter further provides insights pertaining to the underlying molecular interactions which afford phenol’s role as an anti-aging additive for outdoor construction elements. This in turn provides a solution to promote bio-economy and enhance sustainability in the built environment.

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

803: Interactions Between Ultraviolet Radiation and Polymorphisms in the Vitamin D Receptor Gene Mediate Prostate Cancer Susceptibility

2006 ◽  
Vol 175 (4S) ◽  
pp. 260-260
Author(s):  
Nicholas J. Rukin ◽  
Samuel J. Moon ◽  
Dhaval Bodiwala ◽  
Christopher J. Luscombe ◽  
Mark F. Saxby ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Vitamin D ◽  
Ultraviolet Radiation ◽  
Vitamin D Receptor ◽  
Cancer Susceptibility ◽  
Receptor Gene ◽  
Vitamin D Receptor Gene ◽  
Prostate Cancer Susceptibility
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