scholarly journals Further observations on the physico-biochemical and physiolo gical gradients in the ovule during embryogenesis

2014 ◽  
Vol 50 (1-2) ◽  
pp. 295-301
Author(s):  
Marian Ryczkowski
Keyword(s):  
Amino Acids ◽  
Respiration Rate ◽  
Opposite Direction ◽  
Free Amino Acids ◽  
Free Amino ◽  
Exponential Phase ◽  
Ovule Development ◽  
Endosperm Tissue ◽  
Clivia Miniata

In the developing ovule (<em>Clivia</em> sp. and <em>Clivia miniata</em>; exponential phase of embryo growth) the following gradients were found: of osmotic value, concentration of free amino acids, respiration rate in the endosperm tissue, and osmotic value and respiration rate gradients in the embryo. Generally these gradients (with the exception of respiration rate in the embryo) were directed from the chalaza to the micropyde i.e. in the opposite direction of the embryo elongation (imicropyle→chalaza). The obtained results suggest of the direction of some gradients can change during the ovule development.

Dipeptide utilization by starter streptococci

1977 ◽  
Vol 44 (2) ◽  
pp. 309-317 ◽  
Author(s):  
B. A. Law
Keyword(s):  
Amino Acids ◽  
Transport System ◽  
Free Amino Acids ◽  
Free Amino ◽  
Essential Amino Acids ◽  
Exponential Phase ◽  
Whole Cells ◽  
Streptococcus Cremoris ◽  
Defined Media ◽  
Hydrolysis Of

SummaryOf 8 strains ofStreptococcus cremoristested, 5 grew almost as well in defined media in which various essential amino acids were supplied in dipeptides as they did in media containing the equivalent free amino acids. The remainder grew poorly or not at all in the peptide-containing media. Growth of peptide-utilizing strains was inhibited by also including structurally-related dipeptides in the medium, presumably due to competition for uptake by transport system carriers. Both types of starters produced cell-free dipeptidases recoverable from the medium of exponential phase cultures. Addition of the partly-purified extracellular dipeptidases to dipeptidecontaining test media initiated growth in strains unable to use peptides.Str. lactisgrew in defined peptide media, but the further addition of structurally-related dipeptides did not inhibit growth, either bcause each dipeptide was transported by a specific carrier or because peptides were hydrolysed extracellularly. The presence of cell-bound extracellular dipeptidase was indicated by the hydrolysis of dipeptides with washed whole cells in buffer. This was not observed withStr. cremorisstrains.

scholarly journals Free amino acids in the environment of the proembryo during the inhibition phase of its growth (Monocotyledonuos plants)

2015 ◽  
Vol 40 (3) ◽  
pp. 475-482 ◽  
Author(s):  
M. Ryczkowski
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Free Amino Acids ◽  
Free Amino ◽  
Total Concentration ◽  
Central Vacuole ◽  
Concentration Changes ◽  
Similarities And Differences ◽  
Clivia Miniata ◽  
Amino Acid Analyser

Analyses of the central vacuole sap in the ovules of <i>H. Katharinae</i> and <i>Clivia miniata</i> (during the inhibition phase of proembryo growth) for free amino acids were carried out by means of a Micro Column Amino Acid Analyser. Some similarities and differences have been established for both speciesas regards the change of total concentration and concentration changes of particular amino acids.

scholarly journals Free amino acids in the environment of the developing embryo (Dicotyledonous plants)

2015 ◽  
Vol 40 (2) ◽  
pp. 359-370 ◽  
Author(s):  
M. Ryczkowski ◽  
M. G. Buijs ◽  
H. T. Van Dijk ◽  
H. Ryczkowska
Keyword(s):  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Total Concentration ◽  
Exponential Phase ◽  
Dicotyledonous Plants ◽  
Concentration Changes ◽  
Similarities And Differences

The analyses of the central vacule sap in ovules of <i>Aesculus hybrida</i> D.C. and <i>A. hippocastanum</i> L. (generally during the exponential phase of the embryo growth) for free amino acids have been carried out. Some similarities and differences have been established referring the course of the total concentration changes of free amino acids resp. concentration changes of particular amino acids in the sap.

Betaines and free amino acids in salt stressed vitroplants and winter resting buds of Populus trichocarpa x deltoides

1991 ◽  
Vol 83 (1) ◽  
pp. 136-143 ◽  
Author(s):  
L. Bray ◽  
D. Chriqui ◽  
K. Gloux ◽  
D. Le Rudulier ◽  
M. Meyer ◽  
...  
Keyword(s):  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Populus Trichocarpa

Plasma and skeletal muscle free amino acids in type I, insulin-treated diabetic subjects

Diabetes ◽  
1985 ◽  
Vol 34 (8) ◽  
pp. 812-815 ◽  
Author(s):  
L. Borghi ◽  
R. Lugari ◽  
A. Montanari ◽  
P. Dall'Argine ◽  
G. F. Elia ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Type I
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