Adams, H
نویسندگان
چکیده
Experiments were performed to determine the effect of community composition on system function (bacterial production) in arctic Alaska. In this system bacterial production is controlled by: community, temperature, nutrients, and carbon source. Lake inlet and outlet communities in these experiments were different in composition, based on PCR-DGGE fingerprinting of 16S rDNA. For both communities, nutrient additions increased bacterial production far more than warmer temperatures. Inlet communities were more responsive to temperature increases, and sustained nutrient-stimulated production rates longer than the outlet communities. It is known that bacterial diversity will shift to an optimal composition for given environmental conditions. During a fiveday experiment in which temperature, community, and carbon source were manipulated factorially, the two communities shifted towards compositions distinct from each other. Community composition was influenced by temperature more than the provided carbon source. In addition, community composition shifted in response to the nutrient addition over a two week time period. These results imply that bacterial diversity can control system function by mediating community response to shifting environmental conditions such as temperature and nutrient availability both by physiological response and shifting in predominance of community members.
منابع مشابه
Numerical Solution of fuzzy differential equations of nth-order by Adams-Bashforth method
So far, many methods have been presented to solve the rst-order di erential equations. But, not many studies have been conducted for numerical solution of high-order fuzzy di erential equations. In this research, First, the equation by reducing time, we transform the rst-order equation. Then we have applied Adams-Bashforth multi-step methods for the initial approximation of one order di erentia...
متن کاملA Numerical Method For Solving Ricatti Differential Equations
By adding a suitable real function on both sides of the quadratic Riccati differential equation, we propose a weighted type of Adams-Bashforth rules for solving it, in which moments are used instead of the constant coefficients of Adams-Bashforth rules. Numerical results reveal that the proposed method is efficient and can be applied for other nonlinear problems.
متن کاملDetection of a nontrivial element in the stable homotopy groups of spheres
Let $p$ be a prime with $pgeq 7$ and $q=2(p-1)$. In this paper we prove the existence of a nontrivial product of filtration $s+4$ in the stable homotopy groups of spheres. This nontrivial product is shown to be represented up to a nonzero scalar by the product element $widetilde{gamma}_{s}b_{n-1}g_{0}in {Ext}_{mathcal{A}}^{s+4,(p^n+sp^2+sp+s)q+s-3}(mathbb{Z}/p,mathbb{Z}/p)$ in ...
متن کاملEndogenous respiration and polysaccharide reserves in Baker's yeast.
Adams, D. H. (1950). Brit. J. Cancer, 4, 183. Adams, D. H. (1951 a). Brit. J. Cancer, 5, 115. Adams, D. H. (1951 b). Brit. J. Cancer, 5, 409. Adams, D. H. (1952). Biochem. J. 50, 486. Adams, D. H. (1953). Biochem. J. 54; 328. Adams, D. H. (1955). Biochem. J. 60, 568. Buchanan, J. M., Hastings, A. B. & Nesbett, F. N. (1949). J. biol. Chem. 180, 435. Greenfield, R. E. & Meister, A. (1951). J. nat...
متن کاملNordsieck representation of high order predictor-corrector Obreshkov methods and their implementation
Predictor-corrector (PC) methods for the numerical solution of stiff ODEs can be extended to include the second derivative of the solution. In this paper, we consider second derivative PC methods with the three-step second derivative Adams-Bashforth as predictor and two-step second derivative Adams-Moulton as corrector which both methods have order six. Implementation of the proposed PC method ...
متن کاملADAM Gene Expression in The Adult CNS and Genetic Aberrations in Cancer Cells
ADAM metalloprotease-disintegrins share a common modular structure of functional domains for proteolytic, cell adhesion, and signaling interactions. The metalloprotease domain of oughly half of the known ADAMs contain an intact consensus metzincin catalytic site, and they are thus thought to function as active metalloproteases. The types of interactions mediated by ADAMs are expressly conspicu...
متن کامل