EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Regulation of gross growth efficiency and ammonium regeneration in bacteria by substrate carbon to nitrogen ratio


, : Regulation of gross growth efficiency and ammonium regeneration in bacteria by substrate carbon to nitrogen ratio. Limnology & Oceanography 32(6): 1239-1252

Natural assemblages of marine bacteria were cultured on combinations of C and N sources (amino acids, glucose, and NH4+) to span a range of substrate C:N ratios from 1.5:1 to 10:1. Catabolic metabolism of the N component of amino acid substrates led to NH4+ regeneration during exponential growth. The efficiency of this regeneration (RN) and also of the carbon gross growth efficiency (GGE) generally was independent of the sources of C and N, but increased as the C:N ratio of the substrate (C:NS) decreased relative to the C:N ratio of the bacterial biomass (C:NB). The elemental chemical composition(C:N:P ratio) of the bacterial biomass was relatively invariant at about 45:9:1 and the gross growth efficiency varied from a threshold value of about 40-50% at C:NS > 6:1 up to 94% when C:NS was 1.5:1. Hence, RN varied from 0% when C:NS was 10:1 up to 86% when C:NS was 1.5:1. Inorganic sources of both N and P were taken up only in stoichiometric quantities during this phase of growth. Regeneration of NH4+ during the stationary phase as well as of PO43- occurred, most likely due to endogenous metabolism or cell death, but the magnitude of this regeneration seemed to increase greatly only when C:NS was > 6:1. Considering that amino acids frequently do not provide all of the N required and that carbohydrates often are the major C source for growth of marine bacteria, we speculate that C:NS of available substrates in marine waters is > 10:1. Hence, actively growing bacteria may be inefficient remineralizers of N.

(PDF 0-2 workdays service)

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 006288265

PDF Full Text: Submit


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Stadlbauer, Christina-; Reiter, Christian-; Patzak, Beatrix-; Stingeder, Gerhard-; Prohaska, Thomas, 2007: History of individuals of the 18th. A cranium stored in the Stiftung Mozarteum in Salzburg/Austria which is believed to be that of Mozart, and skeletal remains of suspected relatives which have been excavated from the Mozart family grave in the cemetery in Salzburg, have been subjec...

Tobe, H., 1976: Morphological studies on the genus clematis part 2 notes on the bract and floral axis in section paratragene. Floral shoot was studied morphologically in Japanese members of the section Paratragene in Clematis, with special reference to the shape of bracts and their position on the floral axes. Three shape classes of the bracts were recognied, i.e., T-Sha...

Milner G.R.; Humpf D.A.; Harpending H.C., 1989: Pattern matching of age at death distributions in paleodemographic analysis. Model age-at-death distributions are generated from fertility and mortality rates derived from two present-day, traditional human societies and widely differing cultural systems: the !Kung hunters-and-gatherers and Yanomamo horticulturalists. Visu...

Almas Zaidi; Md Saghir Khan; Rizvi, P. Q., 2005: Effect of herbicides on growth, nodulation and nitrogen content of greengram. We studied the effects of glyphosate, metribuzin, fluchloralin and 2,4-dichlorophenoxy-acetic acid (2,4-D) on plant vigor, nodulation, photosynthetic pigments, N content, seed yield and protein content in seeds, in greengram inoculated with Bradyr...

Yui, M., 1980: Studies on the linetransect census method of the woodland bird populations. 2. Effects of the weather conditions on the census effectivity. Surveys at 3 different forest regions, namely Takizawa, Asahikawa and Shigahighland slowed that cloudy or rainy weather affected the census records of every bird species to the same degree. Bad weather conditions and reduced ratios of census effec...

Kamila Bokszczanin; Andrzej Palucha; Andrzej A. Przybyla, 2009: Description of a new trans-generic S kb-RNase allele in apple. Euphytica 166(1): 83-94

Rozhnov, SV., 1993: Role of neoteny in the generation and organization of crinoids. Trudy Sessii Vsesoyuznogo Paleontologicheskogo Obshchestva, 35: 144-152

Twisk, J.W.R.; Kemper, H.C.G.; Van Mechelen, W., 1999: Prediction of bone mineral density by physical activity and physical fitness indicators. Medicine & Science in Sports & Exercise 31(5 SUPPL ): S228, May

Krishnan, K. Ranga Rama, 2003: Comorbidity and depression treatment. Comorbidity is common among patients with major depression, but in most instances it may be of little relevance. Nonetheless, it is a complex issue because of its relation to treatment response, and few studies have attempted to address this. Most...

Barbosa, M. B.; Palma, D.; Bataglin, T.; Taddei, J. A. de A. C., 2007: Cost of feeding in the first year of life. The objectives of this study were to estimate and compare the different alternatives of feeding regimens available for infants in the first year of life, considering the limitations of each option in relation to a feeding regimen adequate for the...