A theoretical approach to acidity–basicity behaviour of some biologically active 6-phenyl-4,5-dihydro-3(2H)-pyridazinone derivatives

2003 ◽  
Vol 666-667 ◽  
pp. 609-615 ◽  
Author(s):  
Cemil Öğretir ◽  
Selma Yarlıgan ◽  
Şeref Demirayak ◽  
Taner Arslan
Keyword(s):  
Theoretical Approach ◽  
Biologically Active ◽  
Pyridazinone Derivatives

Proficient synthesis of biologically active pregnane derivatives and its glycoside – Experimental and theoretical approach

2013 ◽  
Vol 1052 ◽  
pp. 112-124 ◽  
Author(s):  
Arun Sethi ◽  
Akriti Bhatia ◽  
Atul Maurya ◽  
Anil Panday ◽  
Gitika Bhatia ◽  
...  
Keyword(s):  
Theoretical Approach ◽  
Biologically Active

Optical properties of novel environmentally benign biologically active ferrocenyl substituted chromophores: A detailed insight via experimental and theoretical approach

2017 ◽  
Vol 1139 ◽  
pp. 137-148 ◽  
Author(s):  
Salman A. Khan ◽  
Abdullah M. Asiri ◽  
Najat Saeed M. Al-Ghamdi ◽  
Mohie E.M. Zayed ◽  
Kamlesh Sharma ◽  
...  
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Biologically Active ◽  
Environmentally Benign

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

Characterization of photosystem II with the atomic-force microscope

1992 ◽  
Vol 50 (2) ◽  
pp. 1146-1147
Author(s):  
Kathleen M. Marr ◽  
Mary K. Lyon
Keyword(s):  
Photosystem Ii ◽  
Atomic Force Microscope ◽  
Three Dimensional ◽  
Biologically Active ◽  
Atomic Force ◽  
Freeze Etching ◽  
Image Averaging ◽  
Oxygen Evolving ◽  
Averaging Techniques

Photosystem II (PSII) is different from all other reaction centers in that it splits water to evolve oxygen and hydrogen ions. This unique ability to evolve oxygen is partly due to three oxygen evolving polypeptides (OEPs) associated with the PSII complex. Freeze etching on grana derived insideout membranes revealed that the OEPs contribute to the observed tetrameric nature of the PSIl particle; when the OEPs are removed, a distinct dimer emerges. Thus, the surface of the PSII complex changes dramatically upon removal of these polypeptides. The atomic force microscope (AFM) is ideal for examining surface topography. The instrument provides a topographical view of individual PSII complexes, giving relatively high resolution three-dimensional information without image averaging techniques. In addition, the use of a fluid cell allows a biologically active sample to be maintained under fully hydrated and physiologically buffered conditions. The OEPs associated with PSII may be sequentially removed, thereby changing the surface of the complex by one polypeptide at a time.

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