scholarly journals Regioselective Substitution at the 1,3- and 6,8-Positions of Pyrene for the Construction of Small Dipolar Molecules

2015 ◽  
Vol 80 (21) ◽  
pp. 10973-10978 ◽  
Author(s):  
Xing Feng ◽  
Hirotsugu Tomiyasu ◽  
Jian-Yong Hu ◽  
Xianfu Wei ◽  
Carl Redshaw ◽  
...  
Keyword(s):  
Regioselective Substitution ◽  
Dipolar Molecules

Microwaves: Application in Electron Microscopy

1990 ◽  
Vol 48 (3) ◽  
pp. 140-141
Author(s):  
Anthony S-Y Leong ◽  
David W Gove
Keyword(s):  
Electron Microscopy ◽  
Light Microscopy ◽  
Chemical Reactions ◽  
Electromagnetic Waves ◽  
Tissue Fixation ◽  
Primary Method ◽  
Dipolar Molecules ◽  
Wide Range ◽  
Time Required ◽  
Cryostat Sections

Microwaves (MW) are electromagnetic waves which are commonly generated at a frequency of 2.45 GHz. When dipolar molecules such as water, the polar side chains of proteins and other molecules with an uneven distribution of electrical charge are exposed to such non-ionizing radiation, they oscillate through 180° at a rate of 2,450 million cycles/s. This rapid kinetic movement results in accelerated chemical reactions and produces instantaneous heat. MWs have recently been applied to a wide range of procedures for light microscopy. MWs generated by domestic ovens have been used as a primary method of tissue fixation, it has been applied to the various stages of tissue processing as well as to a wide variety of staining procedures. This use of MWs has not only resulted in drastic reductions in the time required for tissue fixation, processing and staining, but have also produced better cytologic images in cryostat sections, and more importantly, have resulted in better preservation of cellular antigens.

Free and Self-Trapped Charge-Transfer Excitons in Crystals of Dipolar Molecules ofN,N-Dimethylaminobenzylidene 1,3-Indandione

1998 ◽  
Vol 102 (7) ◽  
pp. 1086-1094 ◽  
Author(s):  
S. Jursenas ◽  
A. Gruodis ◽  
G. Kodis ◽  
M. Chachisvilis ◽  
V. Gulbinas ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Dipolar Molecules ◽  
Charge Transfer Excitons ◽  
Trapped Charge

scholarly journals Layers of cold dipolar molecules in the harmonic approximation

2012 ◽  
Vol 66 (3) ◽  
Author(s):  
J. R. Armstrong ◽  
N. T. Zinner ◽  
D. V. Fedorov ◽  
A. S. Jensen
Keyword(s):  
Harmonic Approximation ◽  
Dipolar Molecules

scholarly journals Proposal for the formation of ultracold deeply bound RbSr dipolar molecules by all-optical methods

2018 ◽  
Vol 98 (5) ◽  
Author(s):  
Adrien Devolder ◽  
Eliane Luc-Koenig ◽  
Osman Atabek ◽  
Michèle Desouter-Lecomte ◽  
Olivier Dulieu
Keyword(s):  
Optical Methods ◽  
Dipolar Molecules ◽  
All Optical

Reaction rates of ions with dipolar molecules in 2Π electronic states

1992 ◽  
Vol 96 (2) ◽  
pp. 1053-1061 ◽  
Author(s):  
A. G. Wickham ◽  
T. S. Stoecklin ◽  
D. C. Clary
Keyword(s):  
Electronic States ◽  
Reaction Rates ◽  
Dipolar Molecules

ChemInform Abstract: Regioselective Substitution of Fluorine in F8BINOL as a Versatile Route to New Ligands with Axial Chirality.

ChemInform ◽  
2001 ◽  
Vol 32 (12) ◽  
pp. no-no
Author(s):  
Yu Chen ◽  
Shahla Yekta ◽  
L. James P. Martyn ◽  
Juan Zheng ◽  
Andrei K. Yudin
Keyword(s):  
Axial Chirality ◽  
Regioselective Substitution

The Hertzian Spectrum of Rubber and Its Micellar Constitution

1946 ◽  
Vol 19 (4) ◽  
pp. 1085-1087
Author(s):  
Pierre Girard ◽  
Paul Abadie
Keyword(s):  
Dielectric Constant ◽  
Electric Field ◽  
Wave Length ◽  
Structural Features ◽  
Loss Angle ◽  
First Case ◽  
Dipolar Molecules ◽  
Alternating Electric Field ◽  
Different Types ◽  
Absorption And Dispersion

Abstract The spectra which were studied lie within the region of hertzian frequencies, and can be represented either by dispersion curves showing the dielectric constant of the substance as a function of the frequency (or wave length λ), or by absorption curves showing the loss angle as a function of this frequency. These two types of curves represent the same phenomenon, i.e., orientation of the dipolar molecules in the alternating electric field, in accordance with the theory of Debye. The spectra and their interpretation depend chiefly on whether the molecules are crystalloid with relatively small and similar dimensions, or are colloidal, with large and unequal dimensions. In the first case, the spectra gives evidence chiefly on the form of the molecules and their structural features. Dilution in a nonpolar solvent shows for certain dipolar compounds, e.g., alcohol, considerable deformations, which differ according to the solvent. In the case of colloids, e.g., rubber, which has a permanent moment, the spectra and the meaning of these spectra are far different. In this case the spectra indicate that the absorption and dispersion values in the hertzian region are closely related to the micellar constitution, i.e., to the different types of micelles, to their size, and to the proportion of each type.

scholarly journals Charge Movement Associated with the Opening and Closing of the Activation Gates of the Na Channels

1974 ◽  
Vol 63 (5) ◽  
pp. 533-552 ◽  
Author(s):  
Clay M. Armstrong ◽  
Francisco Bezanilla
Keyword(s):  
Time Course ◽  
Sodium Current ◽  
Close Association ◽  
Outward Current ◽  
Transient Outward Current ◽  
Activation Process ◽  
Charge Movement ◽  
Gating Current ◽  
Dipolar Molecules ◽  
Opening And Closing

The sodium current (INa) that develops after step depolarization of a voltage clamped squid axon is preceded by a transient outward current that is closely associated with the opening of the activation gates of the Na pores. This "gating current" is best seen when permeant ions (Na and K) are replaced by relatively impermeant ones, and when the linear portion of capacitative current is eliminated by adding current from positive steps to that from exactly equal negative ones. During opening of the Na pores gating current is outward, and as the pores close there is an inward tail of current that decays with approximately the same time-course as INa recorded in Na-containing medium. Both outward and inward gating current are unaffected by tetrodotoxin (TTX). Gating current is capacitative in origin, the result of relatively slow reorientation of charged or dipolar molecules in a suddenly altered membrane field. Close association with the Na activation process is clear from the time-course of gating current, and from the fact that three procedures that reversibly block INa also block gating current: internal perfusion with Zn2+, prolonged depolarization of the membrane, and inactivation of INa with a short positive prepulse.

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