ChemInform Abstract: Relationships Between the Chemical Structure of Substances and Their Antimycobacterial Activity Against Atypical Strains. Part 10. Antimycobacterial Activity of Some 2,3-Dianilinoquinoxaline Derivatives.

ChemInform ◽  
2010 ◽  
Vol 29 (4) ◽  
pp. no-no
Author(s):  
K. WAISSER ◽  
R. BECKERT ◽  
M. SLOSAFREK ◽  
J. JANOTA
Keyword(s):  
Chemical Structure ◽  
Antimycobacterial Activity ◽  
Atypical Strains

Relationships Between the Chemical Structure of Substances and Their Antimycobacterial Activity Against Atypical Strains. Part 18. 3-Phenyl-2H-1,3-benzoxazine-2,4(3H)-diones and Isosteric 3-Phenylquinazoline-2,4(1H,3H)-diones

1999 ◽  
Vol 64 (11) ◽  
pp. 1902-1924 ◽  
Author(s):  
Karel Waisser ◽  
Miloš Macháček ◽  
Hynek Dostál ◽  
Jiří Gregor ◽  
Lenka Kubicová ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Chemical Structure ◽  
Nontuberculous Mycobacteria ◽  
Antimycobacterial Activity ◽  
Diffusion Method ◽  
Significant Activity ◽  
Vector Algebra ◽  
Phenyl Rings ◽  
Agar Diffusion Method ◽  
Atypical Strains

A series of 3-phenyl-2H-1,3-benzoxazine-2,4(3H)-diones 2 and 3-phenylquinazoline-2,4(1H,3H)-diones 5 substituted on the phenyl rings were synthesized. The target compounds as well as the intermediates were tested against Mycobacterium tuberculosis, M. kansasii, and M. avium. The replacement of the oxygen atom by nitrogen resulted in a decrease or loss of antimycobacterial activity. 2-[(Ethoxycarbonyl)amino]benzanilides 4 appeared to be inactive. Salicylanilides 1 and 3-phenyl-2H-1,3-benzoxazine-2,4(3H)-diones 2 exhibit significant activity against both M. tuberculosis and nontuberculous mycobacteria (the MICs within the range of 4-250 μmol/l for all compounds). The antimycobacterial activity of the compounds increases with increasing both electron-withdrawing properties and hydrophobicity of the substituent(s) on the phenyl moiety. The antimycobacterial profile of the compounds was analyzed according to the criteria based on vector algebra, such as cosine coefficients. Moreover, salicylanilides 1 exhibit activity against other microorganisms tested by the agar diffusion method.

New Groups of Potential Antituberculotics: Bis(1-aryltetrazol-5-yl) Disulfides. Structure Activity Relationship

1994 ◽  
Vol 59 (1) ◽  
pp. 234-238 ◽  
Author(s):  
Karel Waisser ◽  
Jiří Kuneš ◽  
Alexandr Hrabálek ◽  
Želmíra Odlerová
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Antimycobacterial Activity ◽  
Activity Relationship ◽  
Active Derivative ◽  
Structure Activity ◽  
Medium Activity ◽  
Substituent Constants ◽  
Atypical Strains

Oxidation of 1-aryltetrazole-5-thiols afforded bis(1-aryltetrazol-5-yl) disulfides. The compounds were tested for antimycobacterial activity against Mycobacterium tuberculosis, M. kansasii, M. avium and M. fortuitum. In the case of M. tuberculosis, the logarithm of minimum inhibitory concentration showed a parabolic dependence on hydrophobic substituent constants. Although the compounds exhibited low to medium activity, the most active derivative, bis(4-chlorophenyltetrazol-5-yl) disulfide (III) was more effective against atypical strains than are the commercial tuberculostatics used as standards.

scholarly journals THE ANTIMYCOBACTERIAL ACTIVITY OF VARIOUS AMINES RELATED TO SPERMINE IN CHEMICAL STRUCTURE

1953 ◽  
Vol 97 (3) ◽  
pp. 323-325 ◽  
Author(s):  
James G. Hirsch
Keyword(s):  
Liquid Medium ◽  
Chemical Structure ◽  
Antimycobacterial Activity ◽  
Final Concentration ◽  
Chemical Degradation ◽  
Amino Compounds

A final concentration of 3 x 10–5 M spermine or spermidine inhibited the growth of mammalian tubercle bacilli in a modified Dubos liquid medium. Various related amino compounds, including isolated portions of the spermine molecule and the products of its chemical degradation, did not manifest similar antimycobacterial activity.

Inelastic Electron-Matter Interactions

1978 ◽  
Vol 36 (3) ◽  
pp. 259-267
Author(s):  
J. Silcox
Keyword(s):  
Electron Microscope ◽  
Energy Loss ◽  
Chemical Structure ◽  
Inelastic Electron ◽  
Primary Concern ◽  
Unique Probe ◽  
Introductory Paper ◽  
Elastic Processes ◽  
Experimental Level ◽  
Inelastic Processes

In this introductory paper, my primary concern will be in identifying and outlining the various types of inelastic processes resulting from the interaction of electrons with matter. Elastic processes are understood reasonably well at the present experimental level and can be regarded as giving information on spatial arrangements. We need not consider them here. Inelastic processes do contain information of considerable value which reflect the electronic and chemical structure of the sample. In combination with the spatial resolution of the electron microscope, a unique probe of materials is finally emerging (Hillier 1943, Watanabe 1955, Castaing and Henri 1962, Crewe 1966, Wittry, Ferrier and Cosslett 1969, Isaacson and Johnson 1975, Egerton, Rossouw and Whelan 1976, Kokubo and Iwatsuki 1976, Colliex, Cosslett, Leapman and Trebbia 1977). We first review some scattering terminology by way of background and to identify some of the more interesting and significant features of energy loss electrons and then go on to discuss examples of studies of the type of phenomena encountered. Finally we will comment on some of the experimental factors encountered.

Chemical structure of diamond-like carbon thin films

1990 ◽  
Vol 48 (4) ◽  
pp. 710-711
Author(s):  
N.-H. Cho ◽  
K.M. Krishnan ◽  
D.B. Bogy
Keyword(s):  
Electrical Resistivity ◽  
Chemical Structure ◽  
Diamond Like Carbon ◽  
Chemical Structures ◽  
Sputtering Power ◽  
Data Aquisition ◽  
Equilibrium Phases ◽  
Electron Energy Loss ◽  
Power Densities ◽  
Preparation Techniques

Diamond-like carbon (DLC) films have attracted much attention due to their useful properties and applications. These properties are quite variable depending on film preparation techniques and conditions, DLC is a metastable state formed from highly non-equilibrium phases during the condensation of ionized particles. The nature of the films is therefore strongly dependent on their particular chemical structures. In this study, electron energy loss spectroscopy (EELS) was used to investigate how the chemical bonding configurations of DLC films vary as a function of sputtering power densities. The electrical resistivity of the films was determined, and related to their chemical structure.DLC films with a thickness of about 300Å were prepared at 0.1, 1.1, 2.1, and 10.0 watts/cm2, respectively, on NaCl substrates by d.c. magnetron sputtering. EEL spectra were obtained from diamond, graphite, and the films using a JEOL 200 CX electron microscope operating at 200 kV. A Gatan parallel EEL spectrometer and a Kevex data aquisition system were used to analyze the energy distribution of transmitted electrons. The electrical resistivity of the films was measured by the four point probe method.

Sign in / Sign up

Export Citation Format

Share Document