Results 31 to 40 of about 5,247 (209)

Isolation, purification, and characterization of five active diketopiperazine derivatives from endophytic streptomyces SUK 25 with antimicrobial and cytotoxic activities [PDF]

open access: yes, 2017
In our search for new sources of bioactive secondary metabolites from Streptomyces sp., the ethyl acetate extracts from endophytic Streptomyces SUK 25 afforded five active diketopiperazine (DKP) compounds.
Ahmad, Siti Junaidah   +6 more
core   +1 more source

Bioactive Indolyl Diketopiperazines from the Marine Derived Endophytic Aspergillus versicolor DY180635

open access: yesMarine Drugs, 2020
Four new indolyl diketopiperazines, aspamides A–E (1–4) and two new diketopiperazines, aspamides F–G (5–6), along with 11 known diketopiperazines and intermediates were isolated from the solid culture of Aspergillus versicolor, which is an endophyte with
Yi Ding   +5 more
doaj   +1 more source

Insecticidal activities of diketopiperazines of Nomuraea rileyi entomopathogenic fungus [PDF]

open access: yes, 2017
Entomopathogenic fungi are fungal organisms extensively used in various parts of the world as biopesticides against insect pests that cause important economic damage.
Arena, M. (Mario)   +5 more
core   +1 more source

Synthesis of the New Ring System Bispyrido[4',3':4,5]pyrrolo [1,2-a:1',2'-d]pyrazine and Its Deaza Analogue

open access: yesMolecules, 2014
Derivatives of the new ring systems bispyrido[4',3':4,5]pyrrolo[1,2-a:1',2'-d] pyrazine-6,13-dione and its deaza analogue pyrido[4'',3'':4',5']pyrrolo-[1',2':4,5]pyrazino [1,2-a]indole-6,13-dione were conveniently synthesized through a four-step sequence.
Barbara Parrino   +6 more
doaj   +1 more source

Antibacterial activity of cyclo(L-Pro-L-Tyr) and cyclo(D-Pro-L-Tyr) from Streptomyces sp. strain 22-4 against phytopathogenic bacteria [PDF]

open access: yes, 2015
Two bioactive cyclic dipeptides, cyclo(L-Pro-L-Tyr) and cyclo(D-Pro-L-Tyr), were isolated from the culture broth of Streptomyces sp. strain 22-4 and tested against three economically important plant pathogens, Xanthomonas axonopodis pv.
Apichaisataienchote, Busaya   +4 more
core   +3 more sources

Metabolites from the Marine-Derived Fungus Chromocleista sp. Isolated from a Deep-Water Sediment Sample Collected in the Gulf of Mexico [PDF]

open access: yes, 2006
As part of our ongoing chemical investigation of biologically active metabolites from marine fungi, three new compounds, p-hydroxyphenopyrrozin (1) and diketopiperazines (3, 4), have been isolated from the marine-derived fungus Chromocleista sp.
Gunasekera, Sarath P.   +4 more
core   +2 more sources

Dichotocejpins A–C: New Diketopiperazines from a Deep-Sea-Derived Fungus Dichotomomyces cejpii FS110

open access: yesMarine Drugs, 2016
Three new diketopiperazines, dichotocejpins A–C (1–3), together with eight known analogues (4–11), were isolated from the culture of the deep-sea sediment derived fungus Dichotomomyces cejpii FS110.
Zhen Fan   +6 more
doaj   +1 more source

Chiroptical studies on brevianamide B : vibrational and electronic circular dichroism confronted [PDF]

open access: yes, 2015
Chiroptical spectroscopy, such as electronic circular dichroism (ECD) and vibrational circular dichroism (VCD) are highly sensitive techniques to probe molecular conformation, configuration, solvation and aggregation.
Bultinck, Patrick   +7 more
core   +2 more sources

Synthesis and Biological Evaluation (in Vitro and in Vivo) of Cyclic RGD Peptidomimetic - Paclitaxel Conjugates Targeting Integrin alphaVbeta3 [PDF]

open access: yes, 2012
A small library of integrin ligand - Paclitaxel conjugates 10-13 was synthesized with the aim of using the tumor-homing cyclo[DKP-RGD] peptidomimetics for site-directed delivery of the cytotoxic drug.
Arosio D.   +11 more
core   +1 more source

Bacterial Quorum-Sensing Molecules as Promising Natural Inhibitors of Candida albicans Virulence Dimorphism: An In Silico and In Vitro Study

open access: yesFrontiers in Cellular and Infection Microbiology, 2021
Farnesol, a self-secreted quorum-sensing molecule (QSM) of Candida albicans, has been known to limit yeast-to-hyphal transition by blocking the RAS1–cAMP–PKA pathway.
Ravi Jothi   +3 more
doaj   +1 more source

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