Phytotoxic and Photosynthetic Activities of Maduramicin and Maduramicin Methyl Ester

1999 ◽  
Vol 54 (5-6) ◽  
pp. 325-332 ◽  
Author(s):  
Maria Teresa Gutiérrez-Lugo ◽  
Blas Lotina-Hennsen ◽  
Amelia Farrés ◽  
Sergio Sánchez ◽  
Rachel Mata
Keyword(s):  
Methyl Ester ◽  
Foliar Application ◽  
Parent Compound ◽  
Fresh Weight ◽  
Weed Species ◽  
Crop Species ◽  
Methyl Ester Derivative ◽  
Ester Derivative ◽  
Proton Uptake ◽  
Photosynthetic Activities

Abstract The polyether antibiotic maduramicin and its methyl ester derivative inhibited photophos­ phorylation and proton uptake in isolated spinach chloroplasts. Both compounds also en­ hanced basal and phosphorylating electron transport and stimulated Mg2+-dependent AT­ Pase activity, therefore, they behave as uncouplers of photophosphorylation being the methyl ester derivative more potent than the parent compound. On the other hand, maduramicin inhibited germination and radicle elongation of several crop and weed species. In addition, the antibiotic caused phytotoxic injury and fresh weight reduction to 4-to-6 week old seed­ lings of two weed and two crop species when applied at 10-4 ᴍ by foliar application in the greenhouse.

Reduced variation of tracer binding in digoxin radioimmunoassay by use of (125I)-labeled tyrosine-methyl-ester derivative: relation of thyroxine concentration to binding.

1976 ◽  
Vol 22 (10) ◽  
pp. 1732-1734 ◽  
Author(s):  
B H Kroening ◽  
M Weintraub
Keyword(s):  
Methyl Ester ◽  
Binding Proteins ◽  
Serum Samples ◽  
Methyl Ester Derivative ◽  
Ester Derivative ◽  
Free Serum ◽  
Digoxin Radioimmunoassay

Abstract Between-sample variation in tracer binding in the 125I-labeled digoxin radioimmunoassay was investigated with two tracers, 3-O-succinyl-digoxigenin-[125I]-labeled tyrosine and [125I]-labeled tyrosine-methyl-ester-digoxin. Digoxin-free serum samples having various concentrations of thyroxine were assayed with both tracers. The percentage of tracer bound when the samples were assayed with the first-mentioned tracer was increased significantly for the low thyroxine groups when compared to the normal (P less than 0.001) or the high thyroxine groups (P less than 0.05). Little difference existed when the latter tracer was used. There was variation in tracer binding when serum from dogs dosed with thyrotropin was assayed with the first tracer, but there was little variation with the second. Tracer binding may be influenced by thyroxine-binding proteins. Variation in tracer binding appears to be reduced when [125I]-labeled tyrosine-methyl-ester-digoxin is used.

A 2-methylene-β-alanine methyl ester derivative from the soft coral Sinularia dissecta

1999 ◽  
Vol 27 (6) ◽  
pp. 661-662 ◽  
Author(s):  
P. Ramesh ◽  
N. Srinivasa Reddy ◽  
T. Prabakar Rao ◽  
J. Venkateswara Rao ◽  
Y. Venkateswarlu
Keyword(s):  
Methyl Ester ◽  
Soft Coral ◽  
Methyl Ester Derivative ◽  
Ester Derivative

scholarly journals Comparative neurotoxicities of amphotericin B and its mono-methyl ester derivative in rats.

1993 ◽  
Vol 37 (3) ◽  
pp. 419-428 ◽  
Author(s):  
K R Reuhl ◽  
M Vapiwala ◽  
M T Ryzlak ◽  
C P Schaffner
Keyword(s):  
Methyl Ester ◽  
Amphotericin B ◽  
Methyl Ester Derivative ◽  
Ester Derivative

scholarly journals Anti-inflammatory Effects of Indomethacin's Methyl Ester Derivative and Induction of Apoptosis in HL-60 Cells

2005 ◽  
Vol 28 (12) ◽  
pp. 2206-2210 ◽  
Author(s):  
Su-Hui Chao ◽  
An-Bang Wu ◽  
Chia-Jung Lee ◽  
Fu-An Chen ◽  
Ching-Chiung Wang
Keyword(s):  
Methyl Ester ◽  
Methyl Ester Derivative ◽  
Ester Derivative ◽  
Induction Of Apoptosis ◽  
Anti Inflammatory

The Effect of Ultraviolet Radiation on the Fresh Weight of Some Weeds and Crops

1999 ◽  
Vol 13 (3) ◽  
pp. 554-560 ◽  
Author(s):  
Christian Andreasen ◽  
Leif Hansen ◽  
Jens C. Streibig
Keyword(s):  
Uv Radiation ◽  
Fresh Weight ◽  
Weed Species ◽  
Crop Species ◽  
Potential Health ◽  
Senecio Vulgaris ◽  
Annual Bluegrass ◽  
Stage Of Development ◽  
Common Groundsel ◽  
Urtica Urens

Under greenhouse conditions, annual bluegrass (Poa annua L.), common groundsel (Senecio vulgaris L.), shepherd's purse [Capsella bursa-pastoris (L.) Medicus], small nettle (Urtica urens L.), canola (Brassica napus L. ssp. napus), and pea (Pisum sativa L.) differed in sensitivity to ultraviolet (UV) radiation. Of the weed species, annual bluegrass was the least sensitive; whereas, among the crop species, canola was about sevenfold more sensitive than was pea. The sensitivity of a species to UV radiation was highly dependent upon its stage of development. The study indicates some potential for using UV radiation to control weeds, but the method needs further investigation to unravel the selectivity of the methods and potential health hazards.

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