Results 71 to 80 of about 16,341 (199)

Density matrix renormalization group study of dimerization of the Pariser-Parr-Pople model of polyacetilene

open access: yes, 1998
We apply the DMRG method to the Pariser-Parr-Pople hamiltonian and investigate the onset of dimerization. We deduce the parameters of the hopping term and the contribution of the sigma bonds from ab initio calculations on ethylene. Denoting by R_{ij} the
Bendazzoli, G. L.   +4 more
core   +1 more source

The Role of Antifungals in Pediatric Critical Care Invasive Fungal Infections

open access: yesCritical Care Research and Practice, 2018
Invasive fungal infections (IFIs) have seen considerable increase in pediatric intensive care units over the past several decades. IFIs are predominantly caused by Candida species, and candidemia is the third most common cause of healthcare-associated ...
Ashlesha Kaushik, Helen Kest
doaj   +1 more source

Special Issue: Novel Antifungal Drug Discovery

open access: yesJournal of Fungi, 2016
This Special Issue is designed to highlight the latest research and development on new antifungal compounds with mechanisms of action different from the ones of polyenes, azoles, and echinocandins.
Maurizio Del Poeta
doaj   +1 more source

Ring-whizzing in polyene-PtL2 complexes revisited

open access: yesBeilstein Journal of Organic Chemistry, 2016
Ring-whizzing was investigated by hybrid DFT methods in a number of polyene–Pt(diphosphinylethane) complexes. The polyenes included cyclopropenium+, cyclobutadiene, cyclopentadienyl+, hexafluorobenzene, cycloheptatrienyl+, cyclooctatetraene ...
Oluwakemi A. Oloba-Whenu   +2 more
doaj   +1 more source

Mineral Compositions and Organic Color-Related Compounds of Freshwater Bead-Cultured Pearls from Zhuji, Southeast China: Insights from Multi-Spectroscopic Analyses

open access: yesCrystals
Freshwater bead-cultured pearls (FWBCPs) from Zhuji, China, have gained significant market prominence due to their large size, unique pearl luster, and diverse color.
Xi Li, Xiao-Yan Yu, Cun Zhang
doaj   +1 more source

Sub-Poissonian Shot Noise in Molecular Wires

open access: yes, 2002
We investigate the transport behavior of polyene molecules sandwiched between two metallic contacts using the non-equilibrium Green's function formalism.
Dallakyan, S., Mazumdar, S.
core   +1 more source

An Article Review: Charge-Transfer of Polyenes and Carotenes

open access: yesIbn Al-Haitham Journal for Pure and Applied Sciences
     When an electron moves from one atom or molecule to another, a charge-transfer complex is formed. The other objects must be able to accept these electrons, and one entity must have free electrons or a tendency to donate them.
Azhar Mohammed Hasan Wahhab   +1 more
doaj   +1 more source

Sulfation and amidinohydrolysis in the biosynthesis of giant linear polyenes

open access: yesBeilstein Journal of Organic Chemistry, 2017
Clethramycin from Streptomyces malaysiensis DSM4137, and mediomycins (produced together with clethramycin from Streptomyces mediocidicus), are near-identical giant linear polyenes apparently constructed from, respectively, a 4-guanidinobutanoate or 4 ...
Hui Hong   +4 more
doaj   +1 more source

The Photophysics of Diphenyl Polyenes Analyzed by Their Solvatochromism

open access: yesLiquids
The solvent-dependent intensity changes in the first UV/Vis absorption band of the three polyenes DPH, DPHb, and ttbP3 dissolved in a hydrocarbon solvent with temperature allow for the conclusion that, at temperatures above 233 K, the two phenyl groups ...
Javier Catalán, Henning Hopf
doaj   +1 more source

Molecules with enhanced electronic polarizabilities based on defect-like states in conjugated polymers [PDF]

open access: yes, 1991
Highly conjugated organic polymers typically have large non-resonant electronic susceptibilities, which give the molecules unusual optical properties. To enhance these properties, defects are introduced into the polymer chain.
Beratan, David N.
core   +1 more source

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