Architecture and Surface Properties of Monomolecular Films of a Cyanine Dye and Their Light-Induced Modification

1999 ◽  
Vol 103 (14) ◽  
pp. 2709-2717 ◽  
Author(s):  
A. Naber ◽  
U. C. Fischer ◽  
S. Kirchner ◽  
T. Dziomba ◽  
G. Kollar ◽  
...  
Keyword(s):  
Surface Properties ◽  
Cyanine Dye ◽  
Monomolecular Films

Controlling Surface Properties with Peptides: New Methods in Molecular Self-Assembly

1990 ◽  
Vol 218 ◽  
Author(s):  
Troy Wilson ◽  
Mark D. Bednarski
Keyword(s):  
Amino Acids ◽  
Surface Properties ◽  
Convenient Method ◽  
Self Assembly ◽  
Proteolytic Enzymes ◽  
Synthesis And Characterization ◽  
Simple Method ◽  
New Methods ◽  
Monomolecular Films

As part of our investigation into the design and applications of proteolytic enzymes, we required a convenient method to attach peptides to the surface of a variety of materials. In this paper we report the synthesis and characterization of a class of peptide derivatized lipids (PDL's) that can be self-assembled into monomolecular films. These films can be used to control interfacial properties such as wetting and adhesion and provide a simple method to coat surfaces with amino acids.

Interactions of Monomolecular Films of Retinal at Alkaline pH

1974 ◽  
Vol 29 (7-8) ◽  
pp. 327-335 ◽  
Author(s):  
N Yckowski ◽  
S.S. Brody
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Ionic Strength ◽  
Surface Properties ◽  
Mole Fraction ◽  
Surface Pressure ◽  
Water Interface ◽  
Alkaline Ph ◽  
Monomolecular Films ◽  
Mixed Films

The surface properties of mixed monomolecular films of retinal and phospholipids were studied at a nitrogen/water interface. The subphase was glycine buffer pH 10.5 with an ionic strength of 0.1. Monomolecular films of retinal in the presence of amino acids were also measured. The area per molecule, at a surface pressure of 10 dyn/cm, A10 , in the dark for 9-cis retinal and 11-cis retinal are 42 Å2 and 47 Å2, respectively. After irradiation A10 for 9-cis retinal and 11-cis retinal dcerease to 40 Å2 and 43 Å2, respectively. The surface potentials, ⊿V, at a surface pressure of 10 dyn/cm, in the dark for 9-cis retinal and 11-cis retinal are 470 mV and 445 mV, respectively. After irradiation, AV for 9-cis retinal decreases to 435 mV and 11-cis retinal increases to 490 mV. Interaction was observed between retinal and phospholipids and amino acids. The A10 and ⊿V 10 of mixed films of retinal and phospholipid were measured as a function of the mole fraction of phospholipid. Maximum interaction is observed at mole ratios of; phosphatidylserine/9-cis = 1; phosphatidylethanolamine/9-cis = 2, phosphatidylserine/11-cis = 3; phosphatidylethanolamine/11-cis = 3. It is shown that mixing and interaction between phosphatidylethanolamine and retinal is spontaneous. The A10 and ⊿V10 of films of retinal were measured as a function of the molar concentration of amino acid in the subphase. The nature of the interaction between retinal and phospholipid and amino acid are discussed.

Photosynthetic Electron Carriers at a Heptane-Water Interface

1976 ◽  
Vol 31 (9-10) ◽  
pp. 569-574 ◽  
Author(s):  
S. S. Brody ◽  
N. F. Owens
Keyword(s):  
Cytochrome C ◽  
Surface Properties ◽  
Strong Interaction ◽  
The Other ◽  
Water Interface ◽  
Air Water Interface ◽  
Monomolecular Films ◽  
Mixed Films ◽  
Electron Carriers

Abstract Surface properties of monomolecular films of chlorophyll (Chi), plastocyanin (Pc), cytochrome c (Cyt) and ferridoxin (Fd) were measured at a heptane-water interface. Mixed films of Chl and the other components were examined in darkness and in light. The area/molecule, A, for Fd (from Cl. pasteurianum) is much larger at a heptane-water than Fd (from spinach) at an air-water interface. This difference in A may be the source of the Fd or the extent of denaturation at the different interfaces. There appears to be a photoreaction between Chil and Fd in the presence of ascorbate. The A for Cyt is much larger at a heptane-water than at an air-water interface. In mixed films there is a strong interaction between Chl and reduced Cyt in the dark. No such interaction is ob­served between Chi and oxidized Cyt. With mixed films of Chi and reduced Pc there is a significant, reversible, light induced change in ΔV.

Surface Properties of Monomolecular Films of Reduced Plastocyanin at a Nitrogen-Water Interface

1975 ◽  
Vol 30 (5-6) ◽  
pp. 318-322 ◽  
Author(s):  
Seymour Steven Brody
Keyword(s):  
Surface Properties ◽  
Surface Potential ◽  
Surface Pressure ◽  
Water Interface ◽  
Monomolecular Films ◽  
Mixed Films ◽  
Maximum Decrease

Abstract The area/molecule (A) and surface potential (∆V) of reduced plastocyanin (pcyan) was measured as a function of pH. At pH 7.5 a maximum is observed for A while a minimum is ob­ served for ∆V. At a surface pressure of 5 dyn/cm the maximum A5 = 378 Å2 and minimum ∆V 5 = 335 mV. There is an interaction between pcyan and chlorophyll (Chi) in mixed films. As shown by a decrease of A and V compared to theoretically calculated volues. The largest decrease occurs at a mol ratio of about 2 pcyan: 1 Chl. When mixed films are irradiated in air no changes in surface properties are observed. Irradiation of mixed films of reduced pcyan and Chi in nitrogen results in a decrease in A and an increase of ∆V. The maximum decrease occurs at a mol ratio of pcyan/Chl between 1.5 and 2.0. The direction of change of A is consistant with a conversion of reduced pcyan to oxidized pcyan.

Biological and Surface Properties of C-Type Virus Particles Produced by Novikoff Ascites Hepatoma Cells

1977 ◽  
Vol 35 ◽  
pp. 388-389
Author(s):  
D.C. Hixson ◽  
J.C. Chan ◽  
J.M. Bowen ◽  
E.F. Walborg
Keyword(s):  
Surface Properties ◽  
Ricinus Communis ◽  
Rat Kidney ◽  
Leukemia Virus ◽  
Viral Envelope ◽  
Virus Particles ◽  
Chemically Induced ◽  
Sarcoma Virus ◽  
Hepatocarcinoma Cells ◽  
Type C

Several years ago Karasaki (1) reported the production of type C virus particles by Novikoff ascites hepatocarcinoma cells. More recently, Weinstein (2) has reported the presence of type C virus particles in cell cultures derived from transplantable and primary hepatocellular carcinomas. To date, the biological function of these virus and their significance in chemically induced hepatocarcinogenesis are unknown. The present studies were initiated to determine a possible role for type C virus particles in chemically induced hepatocarcinogenesis. This communication describes results of studies on the biological and surface properties of type C virus associated with Novikoff hepatocarcinoma cells.Ecotropic and xenotropic murine leukemia virus (MuLV) activity in ascitic fluid of Novikoff tumor-bearing rats was assayed in murine sarcoma virus transformed S+L- mouse cells and S+L- mink cells, respectively. The presence of sarcoma virus activity was assayed in non-virus-producing normal rat kidney (NRK) cells. Ferritin conjugates of concanavalin A (Fer-Con wheat germ agglutinin (Fer-WGA), and Ricinus communis agglutinins I and II (Fer-RCAI and Fer-RCAII) were used to probe the structure and topography of saccharide determinants present on the viral envelope.

Inelastic scattering at surfaces and interfaces

1986 ◽  
Vol 44 ◽  
pp. 392-393
Author(s):  
R. H. Ritchie ◽  
A. Howie
Keyword(s):  
Inelastic Scattering ◽  
Surface Properties ◽  
Correlation Energy ◽  
Condensed Matter ◽  
Charged Particles ◽  
Condensed Matter Physics ◽  
Optical Phonons ◽  
Exchange Correlation ◽  
Surfaces And Interfaces ◽  
Inelastic Interactions

An important part of condensed matter physics in recent years has involved detailed study of inelastic interactions between swift electrons and condensed matter surfaces. Here we will review some aspects of such interactions.Surface excitations have long been recognized as dominant in determining the exchange-correlation energy of charged particles outside the surface. Properties of surface and bulk polaritons, plasmons and optical phonons in plane-bounded and spherical systems will be discussed from the viewpoint of semiclassical and quantal dielectric theory. Plasmons at interfaces between dissimilar dielectrics and in superlattice configurations will also be considered.

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