Results 21 to 30 of about 5,603 (210)

Amazonian Cyanobacteria as a Source of Bioactive Compounds With Antimicrobial and Cytotoxic Properties. [PDF]

Chem Biodivers
ABSTRACT Cyanobacteria are photosynthetic microorganisms known for producing diverse bioactive compounds. This study explores the bioactivity of extracts and fractions from Amazonian cyanobacteria and their pigment and phenolic compound production. A fraction from Synechococcus sp. CACIAM 05 showed cytotoxicity against hCMEC/D3 and MG‐63 cells.
Cavalcante do Amaral S, Xavier LP, Reis M, Médice RV, Morone J, Silva R, Morais J, Vasconcelos V, Santos AV.   +8 more
europepmc   +2 more sources

Pheophorbide a Derivatives Exert Antiwrinkle Effects on UVB-Induced Skin Aging in Human Fibroblasts

Life, 2021
Pheophorbide a is a chlorophyll metabolic breakdown product. This study investigated the antiwrinkle effect of pheophorbide a (PA) and its derivatives, including pyropheophorbide a (PyroPA) and pyropheophorbide a methyl ester (PyroPA-ME), on ultraviolet (
Hwa Lee, Ho-Yong Park, Tae-Sook Jeong
doaj   +1 more source

Chemical Composition, Antioxidant, and Antibacterial Activities of Mezilaurus duckei (Lauraceae). [PDF]

Chem Biodivers
ABSTRACT Mezilaurus duckei, a Brazilian endemic tree species found exclusively in the Amazon Rainforest, is primarily exploited for timber in construction. Due to its endangered status, this study aimed to investigate the chemical profile and biological properties of the ethanolic extract and its phases derived from M. duckei leaves. Chemical profiling
Moroto BS, Gonçalves VS, Machate DJ, Freire TV, Santos ÉL, Alves FM, Micheletti AC, Yoshida NC.   +7 more
europepmc   +2 more sources

STRUCTURE OF METHYLPHEOPHORBIDE-RCI [PDF]

, 1986
he methanolic extract of the cyanobacterium (blue-green alga) Spirulina geitleri has been treated with methanolic acid to convert all chlorophyllous pigments to their methylpheophorbides.
Budzikiewicz H., Dismukes G. C., Dornemann D., Dornemann D., Dornemann D., Feher G., Fischer H., Fuhrhop J.H., Harrison J. E., Hynninen P. H., Hynninen P. H., Klimov V. V., Knaff D. B., Moore R. E., Norris J.R., O'Malley P. J., Schaffernicht H., Schatz G. H., Scheer H., Scheer H., Senger H., Svec W. A., Thomas J. A., Vacek K., Vierling E., Wasielewski M., Wu S.M., Yuasa M.   +27 more
core   +1 more source

Pheophorbide a May Regulate Jasmonate Signaling during Dark-Induced Senescence [PDF]

Plant Physiology, 2019
Chlorophyll degradation is one of the most visible signs of leaf senescence. During senescence, chlorophyll is degraded in the multistep pheophorbide a oxygenase (PAO)/phyllobilin pathway. This pathway is tightly regulated at the transcriptional level, allowing coordinated and efficient remobilization of nitrogen toward sink organs. Using a combination
Aubry, Sylvain, Fankhauser, Niklaus, Ovinnikov, Serguei, Pružinská, Adriana, Stirnemann, Marina, Zienkiewicz, Krzysztof, Herrfurth, Cornelia, Feussner, Ivo, Hörtensteiner, Stefan   +8 more
openaire   +4 more sources

Effect of Blue Light-Emitting Diode (LED) Irradiation on Chlorophyll Metabolism in Ethylene-Degreened Early-Season Satsuma Mandarin Fruit [PDF]

Shipin Kexue, 2023
Early-season Satsuma mandarin fruit produced in Chongqing are usually harvested when the flesh reaches the acceptable internal maturity standards, while the peel is still green. In order to solve this problem, ethylene degreening treatment is widely used
CAO Tingting, ZENG Kaifang, DENG Lili
doaj   +1 more source

Pheophorbide a Is a Specific Probe for ABCG2 Function and Inhibition [PDF]

Cancer Research, 2004
Abstract Pheophorbide a (PhA), a chlorophyll catabolite, was shown to be an ABCG2 substrate based on Abcg2−/− knockout mouse studies (J. W. Jonker et al., Proc. Natl. Acad. Sci. USA, 99: 15649–15654, 2002). We developed a functional assay for ABCG2 using PhA and the ABCG2 inhibitor fumitremorgin C.
Robert W, Robey, Kenneth, Steadman, Orsolya, Polgar, Kuniaki, Morisaki, Margaret, Blayney, Prakash, Mistry, Susan E, Bates   +6 more
openaire   +2 more sources

Characterization of a novel allele encoding pheophorbide a oxygenase in rice [PDF]

Plant Signaling & Behavior, 2020
We identified a rapid cell death 2 (rcd2) mutant from an indica cultivar Zhongjian100 mutant bank. The red-brown lesions appeared firstly on young seedling leaves, then gradually merged and the leaves completely withered at the late tillering stage. rcd2 displayed apparent cell death at/around the lesions, accumulation of superoxide anion (O2−) and ...
Zhihong Zhang, Yan He, Liangjian Li, Xiaobo Zhang, Xia Xu, Yongfeng Shi, Jian-Li Wu   +6 more
openaire   +3 more sources

The Diatom Cylindrotheca closterium and the Chlorophyll Breakdown Product Pheophorbide a for Photodynamic Therapy Applications

Applied Sciences, 2023
Microalgae, eukaryotic unicellular plants that are distributed worldwide, have been shown to exert anti-proliferative and anticancer activities on various human cancer cell lines.
Assunta Saide, Gennaro Riccio, Adrianna Ianora, Chiara Lauritano   +3 more
doaj   +1 more source

Proton-Electron Hyperfine Coupling Constants of the Chlorophyll a Cation Radical by ENDOR Spectroscopy [PDF]

, 1977
In this paper we describe the assignment of the major coupling constants in monomer chlorophyll a cation free radical by ENDOR spectroscopy. To facilitate chemical manipulation methylpyrochlorophyllide a has been used as a stand-in, and a suite of six ...
Katz, J. J., Norris, J. R., Scheer, Hugo
core   +1 more source