منابع مشابه
Sundials and Mathematical Surfaces
The ancient art of sundial designing and making has produced an astonishing variety of designs, many of them ingenious and works of art. The history and a fair sample of various designs can be found in [Ro] or [Pe,Sch,SP]. The principles of working are in many cases forgotten and understood only by a very tedious reverse-engineering, often made much more difficult by wellmeant but incompetent r...
متن کاملConstruction of the Ring of Witt Vectors
I will describe a functor A 7→ W (A) from the category of commutative rings to itself. The ring W (A) of ‘Witt vectors’ over A has many applications (to algebraic geometry, local rings, etc.), but I won’t discuss those. Convention: rings have 1’s that are respected by ring homomorphisms. By A I will always denote a commutative ring. The literature on the functor W is in a somewhat unsatisfactor...
متن کاملConstruction of cloning vectors for Bacillus thuringiensis.
The replication region of the Bacillus thuringiensis plasmid, pHT1030, was treated with hydroxylamine. Various copy-number mutants were selected and subsequently used to construct shuttle vectors with multiple cloning sites. These recombinant plasmids are very stable and allowed the cloning of a delta-endotoxin-encoding gene in B. thuringiensis. Comparison between gene expression level and vect...
متن کاملOn the Construction of Positive Scaling Vectors
Let be a compactly supported, orthonormal scaling function that generates the linear space V0 2 L2(IR). We are motivated by the work of Walter and Shen [7]. In this paper, the authors use an Abel summation technique to build a positive scaling function Pr, 0 < r < 1, for the space V0. A reproducing kernel can in turn be constructed using Pr. This kernel is also positive, has unit integral, and ...
متن کاملConstruction of Recombinant Vectors Containing Clavulanic Acid Antibiotic Regulatory Gene, claR, Isolated of Streptomyces clavuligerus Strains
The claR of Streptomyces clavuligerus in the clavulanic acid gene cluster encodes a transcriptional regulator that controls clavulanic acid biosynthesis. The main goal of this study was isolation and molecular detection of the claR gene and its cloning in the Streptomyces specific vector (pMA:: hyg). By cinsideration of the claR gene’s start codon, the specific primers were designed. After geno...
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ژورنال
عنوان ژورنال: International Journal of Mathematical Education in Science and Technology
سال: 2018
ISSN: 0020-739X,1464-5211
DOI: 10.1080/0020739x.2018.1480810