Allelochemicals change macromolecular content of some selected weeds

2020 ◽  
Vol 130 ◽  
pp. 177-184
Author(s):  
Waseem Mushtaq ◽  
Quratul Ain ◽  
M.B. Siddiqui ◽  
Hesham Alharby ◽  
Khalid Rehman Hakeem
Keyword(s):  
Macromolecular Content

Nucleic Acid, Protein Content, and Growth of Larval Fish Sublethally Exposed to Various Toxicants

1984 ◽  
Vol 41 (1) ◽  
pp. 141-150 ◽  
Author(s):  
Mace G. Barron ◽  
Ira R. Adelman
Keyword(s):  
Nucleic Acid ◽  
Protein Content ◽  
Larval Fish ◽  
Life Stage ◽  
Pimephales Promelas ◽  
Early Life Stage ◽  
Toxicant Exposure ◽  
Growth Measurement ◽  
Log Linear ◽  
Macromolecular Content

Larval fathead minnows (Pimephales promelas) were exposed for 96 h to several concentrations of benzophenone, ethyl acetate, hexavalent chromium, hydrogen cyanide, or p-cresol. The range of "safe" concentrations determined from 96-h macromolecular content (RNA, DNA, and protein) and growth was within or very near the range of "safe" concentrations determined by concomitant longer term exposure (28- to 32-d early life stage toxicity test). RNA, DNA, and protein content per larva and RNA/DNA ratio were sensitive to toxicant stress and followed a log-linear dose response. Larval RNA content appeared to be the 96-h measurement most responsive to toxicant exposure. A disruption of nucleic acid and protein metabolism apparently occurred within 96 h of sublethal toxicant exposure and resulted in (1) decreased rates of mitosis, (2) reduced protein synthesis, and (3) reduced growth. Measurement of growth and macromolecular content after a 96-h larval exposure provided a physiologically relevant measurement of toxicity that was predictive of longer term sublethal toxicity.

DNA-Membrane Complex: Macromolecular Content and Stimulation of Enzymatic Activity by Polyadenylic Acid

Science ◽  
1970 ◽  
Vol 169 (3940) ◽  
pp. 66-68 ◽  
Author(s):  
W. Firshein ◽  
R. G. Gillmor
Keyword(s):  
Enzymatic Activity ◽  
Membrane Complex ◽  
Polyadenylic Acid ◽  
Stimulation Of ◽  
Macromolecular Content

Modified hydroxyethylmethacrylate hydrogels as a modelling tool for the study of cell-substratum interactions

1989 ◽  
Vol 92 (1) ◽  
pp. 111-121
Author(s):  
P.R. Bergethon ◽  
V. Trinkaus-Randall ◽  
C. Franzblau
Keyword(s):  
Cellular Proliferation ◽  
Hydroxyl Groups ◽  
Native Proteins ◽  
Cell Matrix ◽  
Matrix Interactions ◽  
Specific Proteins ◽  
Cell Matrix Interactions ◽  
And Control ◽  
Macromolecular Content

The interactions between cells and their extracellular substratum environment are complex and difficult to study. Defined, synthetic substrata are valuable tools for experimentally determining the role of ionic and receptor-specific interactions between cells and their substrata. Hydrogels have been modified to contain stoichiometrically defined quantities of both positive and negative charge as well as specific proteins. These synthetic surfaces are water-rich matrices that possess hydroxyl groups, positive and negative ionized charges and native proteins, and can be considered as models of extracellular matrices on which an assessment of charge contribution and macromolecular content and specificity can be addressed with respect to cell-matrix interactions. This study shows that simple gels made of polyhydroxyethylmethacrylate do not support the spreading of cells but that the generation of copolymers by the addition of monomers that contain ionizable functional groups, will permit cell spreading. These simple modifications do not lead to cellular proliferation, yet when collagen is entrapped in the hydrogel substratum, proliferation occurs. The proliferative rate of cells grown on collagen-containing surfaces may be modified by altering the stoichiometry of the ionizable polymers used to make the surface. This study describes a synthetic, definable model for the study of cell-substratum interactions and control.

A Multimodal Spectroscopic Imaging Method To Characterize the Metal and Macromolecular Content of Proteinaceous Aggregates (“Amyloid Plaques”)

Biochemistry ◽  
2017 ◽  
Vol 56 (32) ◽  
pp. 4107-4116 ◽  
Author(s):  
Kelly L. Summers ◽  
Nicholas Fimognari ◽  
Ashley Hollings ◽  
Mitchell Kiernan ◽  
Virginie Lam ◽  
...  
Keyword(s):  
Spectroscopic Imaging ◽  
Amyloid Plaques ◽  
Imaging Method ◽  
Macromolecular Content

Growth and macromolecular content of the dimorphic fungus Aureobasidium pullulans and the effect of hydroxyurea and other inhibitors

1988 ◽  
Vol 54 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Maria J. Sevilla ◽  
M. Dolores Moragues ◽  
Federico Uruburu
Keyword(s):  
Aureobasidium Pullulans ◽  
Dimorphic Fungus ◽  
Macromolecular Content

scholarly journals Gd-DTPA relaxivity depends on macromolecular content

2000 ◽  
Vol 44 (5) ◽  
pp. 665-667 ◽  
Author(s):  
Greg J. Stanisz ◽  
R. Mark Henkelman
Keyword(s):  
Macromolecular Content

SYNOVIAL FLUID - ITS MASS, MACROMOLECULAR CONTENT AND PRESSURE IN MAJOR LIMB JOINTS OF THE RABBIT

1988 ◽  
Vol 73 (1) ◽  
pp. 33-45 ◽  
Author(s):  
P. Knox ◽  
J. R. Levick ◽  
J. N. McDonald
Keyword(s):  
Synovial Fluid ◽  
Macromolecular Content

Changes in viability and macromolecular content of long-term batch cultures of Salmonella typhimurium measured by flow cytometry

2000 ◽  
Vol 89 (1) ◽  
pp. 90-99 ◽  
Author(s):  
K. Turner ◽  
J. Porter ◽  
R. Pickup ◽  
C. Edwards
Keyword(s):  
Flow Cytometry ◽  
Salmonella Typhimurium ◽  
Batch Cultures ◽  
Macromolecular Content

scholarly journals The metabolism of macromolecules during the differentiation of myxamoebae of the cellular slime mould Dictyostelium discoideum containing different amounts of glycogen

1974 ◽  
Vol 142 (2) ◽  
pp. 301-315 ◽  
Author(s):  
B. D. Hames ◽  
J. M. Ashworth
Keyword(s):  
Amino Acids ◽  
Dictyostelium Discoideum ◽  
Cellular Protein ◽  
Soluble Proteins ◽  
Metabolizable Energy ◽  
Linear Rate ◽  
Cellular Slime Mould ◽  
Protein Molecules ◽  
Cellular Slime ◽  
Macromolecular Content

1. Methods of obtaining myxamoebae of Dictyostelium discoideum strain Ax-2 (ATCC 24397) with glycogen contents in the range 0.05–5mg of glycogen/108cells are described. The changes in cellular glycogen, protein and RNA content during the differentiation of such myxamoebae were determined. 2. Myxamoebal glycogen is not conserved during differentiation and gluconeogenesis may occur even in cells that contain a large amount of glycogen initially. 3. There is a marked net loss of cellular protein and RNA during differentiation and associated with this there are also marked decreases in the sizes of the intracellular pools of amino acids, acid-soluble proteins and pentose-containing materials. 4. During the early stages of development some protein and pentose(s) are excreted, but this cannot account for the decreased cellular content of protein and RNA. 5. There is a linear rate of production of NH3 during development, and oxidation appears to be the fate of the major portion of the degraded protein and RNA. 6. However, provision of an alternative metabolizable energy source (glycogen) has little effect on the rate or extent of protein or RNA breakdown or on the changes in the sizes of the intracellular pools of amino acids, acid-soluble proteins and pentose-containing materials. 7. It is concluded that during development there is a requirement for the destruction of specific RNA and protein molecules for reasons other than the provision of oxidizable substrates. 8. The kinetic model of Wright et al. (1968) is discussed in relation to these changes in macromolecular content.

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