Swords into plowshares? Nicotiana sylvestris does not use nicotine as a nitrogen source under nitrogen-limited growth

Oecologia ◽  
1994 ◽  
Vol 98 (3-4) ◽  
pp. 385-392 ◽  
Author(s):  
Ian T. Baldwin ◽  
Thomas E. Ohnmeiss
Keyword(s):  
Nitrogen Source ◽  
Nicotiana Sylvestris ◽  
Limited Growth

scholarly journals Purine Catabolism in Escherichia coliand Function of Xanthine Dehydrogenase in Purine Salvage

2000 ◽  
Vol 182 (19) ◽  
pp. 5332-5341 ◽  
Author(s):  
Hualin Xi ◽  
Barbara L. Schneider ◽  
Larry Reitzer
Keyword(s):  
Nitrogen Source ◽  
Minimal Medium ◽  
Nitrogen Sources ◽  
Xanthine Dehydrogenase ◽  
Conclusive Evidence ◽  
Carbamoyl Phosphate ◽  
Limited Growth ◽  
Purine Salvage ◽  
Purine Catabolism ◽  
Catabolic Enzymes

ABSTRACT Escherichia coli is not known to utilize purines, other than adenine and adenosine, as nitrogen sources. We reinvestigated purine catabolism because a computer analysis suggested several potential ς54-dependent promoters within a 23-gene cluster whose products have homology to purine catabolic enzymes. Our results did not provide conclusive evidence that the ς54-dependent promoters are active. Nonetheless, our results suggest that some of the genes are metabolically significant. We found that even though several purines did not support growth as the sole nitrogen source, they did stimulate growth with aspartate as the nitrogen source. Cells produced 14CO2 from minimal medium containing [14C]adenine, which implies allantoin production. However, neither ammonia nor carbamoyl phosphate was produced, which implies that purine catabolism is incomplete and does not provide nitrogen during nitrogen-limited growth. We constructed strains with deletions of two genes whose products might catalyze the first reaction of purine catabolism. Deletion of one eliminated 14CO2 production from [14C]adenine, which implies that its product is necessary for xanthine dehydrogenase activity. We changed the name of this gene to xdhA. The xdhA mutant grew faster with aspartate as a nitrogen source. The mutant also exhibited sensitivity to adenine, which guanosine partially reversed. Adenine sensitivity has been previously associated with defective purine salvage resulting from impaired synthesis of guanine nucleotides from adenine. We propose that xanthine dehydrogenase contributes to this purine interconversion.

In vitro Evaluation of Ammonium Base Sulfite Liquor as an Energy and Nitrogen Source for Ruminants

1976 ◽  
Vol 42 (4) ◽  
pp. 993-1001 ◽  
Author(s):  
R. P. Kromann ◽  
T. R. Wilson ◽  
G. S. Cantwell
Keyword(s):  
Nitrogen Source ◽  
In Vitro Evaluation

Does Nitrogen Source Affect the Palatability of Coastal Bermudagrass? 1

1958 ◽  
Vol 50 (3) ◽  
pp. 172-173 ◽  
Author(s):  
Glenn W. Burton ◽  
James E. Jackson ◽  
B. L. Southwell
Keyword(s):  
Nitrogen Source ◽  
Coastal Bermudagrass

Response of No-Till Corn to Nitrogen Source, Rate, and Time of Application

jpa ◽  
1992 ◽  
Vol 5 (4) ◽  
pp. 607-610 ◽  
Author(s):  
K. L. Wells ◽  
W. O. Thom ◽  
H. B. Rice
Keyword(s):  
Nitrogen Source ◽  
Time Of Application ◽  
No Till ◽  
Source Rate

Spring Dead Spot and Burmudagrass Quality As Influenced by Nitrogen Source and Potassium

Crop Science ◽  
1991 ◽  
Vol 31 (6) ◽  
pp. 1674-1680 ◽  
Author(s):  
P. H. Dernoeden ◽  
J. N. Crahay ◽  
D. B. Davis
Keyword(s):  
Nitrogen Source ◽  
Spring Dead Spot

Competition between nitrogen-fixing cyanobacteria during phosphorus-limited growth

1995 ◽  
Vol 32 (4) ◽  
pp. 99-101 ◽  
Author(s):  
W. T. (Pim) De Nobel ◽  
N. Staats ◽  
L. R. Mur
Keyword(s):  
Light Intensity ◽  
Competitive Advantage ◽  
Future Study ◽  
Nitrogen Fixing ◽  
Limited Growth

The phosphorus-limited growth of cultures of the nitrogen-fixing cyanobacteria Aphanizomenon and Anabaena was investigated. In conditions of nutrient and light excess Anabaena has a competitive advantage. The lower the light intensity conditions at which Aphanizomenon populations dominate are indicated for future study.

Diffusion limited growth-up of channels of ICF and its influence on integral flow through the channel

2009 ◽  
Vol 45 (4) ◽  
pp. 613-621
Author(s):  
V. Frishfelds ◽  
◽  
A. Jakovičs ◽  
B. Nacke ◽  
E. Baake ◽  
...  
Keyword(s):  
Limited Growth ◽  
Diffusion Limited ◽  
Flow Through
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