Results 261 to 270 of about 8,109,340 (304)

A DNA Sequence for Positioning Chromatosomes

Journal of Molecular Biology, 1996
We have analysed the sequences of 280 chromatosomal DNA molecules. In approximately half the clones, a short DNA sequence of the preferred form NGGR is located at one, but not both, of the termini of the cloned DNA. We show that the clones lacking this signal possess a substantially stronger rotational positioning signal than those that contain it ...
A A, Travers, S V, Muyldermans
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DNA Sequencing With Positive and Negative Errors

Journal of Computational Biology, 1999
The problem addressed in this paper is concerned with DNA sequencing by hybridization. An algorithm is proposed that solves a computational phase of this approach in the presence of both positive and negative errors resulting from the hybridization experiment. No a priori knowledge of the nature and source of these errors is required.
Jacek Blazewicz, Piotr Formanowicz, Marta Kasprzak, Wojciech T. Markiewicz, Jan Weglarz   +4 more
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Positivity certificates for P-recursive sequences

ACM Communications in Computer Algebra, 2023
We extend the decidability of the positivity problem for P-recursive sequences of Poincaré type having one simple dominant eigenvalue and generic initial conditions. We give an algorithm that produces a certificate of positivity that is a data-structure for a proof by induction.
Ibrahim, Alaa, Salvy, Bruno
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Positional Statistical Significance in Sequence Alignment

Journal of Computational Biology, 1999
Beginning with the concept of near-optimal sequence alignments, we can assign a probability that each element in one sequence is paired in an alignment with each element in another sequence. This involves a sum over the set of all possible pairwise alignments.
Lihua Yu, Temple F. Smith
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Sequences with positive semidefinite Fourier transforms

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1986
A sequence is said to be positive if its Fourier transform exclusively takes on real nonnegative values as a function of frequency. Positive sequences play a prominent role in contemporary signal processing and system theory. To illustrate this point, it is well known that the factorization theorem is extensively used in studies related to wide-sense ...
J Cadzow
exaly   +2 more sources

On sequences of positive integers

Acta Arithmetica, 1936
Sind \(a_1,...,a_n\) verschiedene natürliche Zahlen und ist \(\{b_i\}\) die Folge der natürlichen Zahlen, welche durch irgendein \(a_i\) teilbar ist, so existiert die natürliche Dichte \(A(a_1,...,a_m)\) der Folge \(\{b_i\}\). Ist nun \(\{a_i\}\) eine unendliche Folge (in wachsender Ordnung) von natürlichen Zahlen, so existiert \(\lim_{m \to \infty} A ...
Davenport, Harold, Erdős, Pál
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On a Sequence of Linear and Positive Operators

Results in Mathematics, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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A state-space approach to positive sequences

ICASSP '87. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005
The problem considered in this paper is the following: given a symmetric sequence {r_{j}} which is not positive, (i.e. its Fourier transform takes on negative values), find a positive sequence {\bar{r}_{j}} which is a good approximation to {r_{j}} . This problem arises, for example, when {r_{j}} is an estimated covariance sequence which is not positive,
Vaccaro, Richard J., Li, Fu
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Maximum Length of Robust Positioning Sequences

2020 IEEE International Symposium on Information Theory (ISIT), 2020
An (n,d)-robust positioning sequence (RPS) is a binary sequence where every pair of length-n subwords is distance d apart. In this paper, we study the quantity P(n,d), which denotes maximum length of an (n,d)-RPS, and provide tight estimates in the range n/2 < d ≤ n.
Duc Tu Dao, Han Mao Kiah, Hengjia Wei
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Sequence-directed Mapping of Nucleosome Positions

Journal of Biomolecular Structure and Dynamics, 2007
A nucleosome DNA sequence probe is designed that combines recently derived RR/YY counter-phase and AA/TT in-phase periodical patterns. A simple nucleosome mapping procedure is introduced for prediction of the nucleosome positions in the sequence of interest, to serve as a guide for experimental studies of the chromatin structure.
F, Salih, B, Salih, E N, Trifonov
openaire   +2 more sources