Algebraic construction of semi bent function via known power function

The study of semi bent functions (2- plateaued Boolean function) has attracted the attention of many researchers due to their cryptographic and combinatorial properties. In this paper, we have given the algebraic construction of semi bent functions defined over the finite field F₂ⁿ (n even) using the notion of trace function and Gold power exponent. Algebraically constructed semi bent functions have some special cryptographical properties such as high nonlinearity, algebraic immunity, and low correlation immunity as expected to use them effectively in cryptosystems. We have illustrated the existence of these properties with suitable examples.Publisher's Versio

A recent survey of permutation trinomials over finite fields

Constructing permutation polynomials is a hot topic in the area of finite fields, and permutation polynomials have many applications in different areas. Recently, several classes of permutation trinomials were constructed. In 2015, Hou surveyed the achievements of permutation polynomials and novel methods. But, very few were known at that time. Recently, many permutation binomials and trinomials have been constructed. Here we survey the significant contribution made to the construction of permutation trinomials over finite fields in recent years. Emphasis is placed on significant results and novel methods. The covered material is split into three aspects: the existence of permutation trinomials of the respective forms $x^{r}h(x^{s})$, $\lambda_{1}x^{a}+\lambda_{2}x^{b}+\lambda_{3}x^{c}$ and $x+x^{s(q^{m}-1)+1} +x^{t(q^{m}-1)+1}$, with Niho-type exponents $s, t$

Synthesis, characterization and biological studies of some triazolothiadiazines and triazolothiadiazoles containing 6-chloropyridin-3-yl methyl moiety

2071-20764-Amino-5-(6-chloropyridin-3-yl methyl)-4H-1,2,4-triazole-3-thiol has been synthesized and was converted into 3-(6-chloropyridin-3-yl methyl)-6-(4-substituted-phenyl)-7H-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazines and (6-chloropyridin-3-yl­methyl)-6-(4-substituted-phenyl)-7H-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles. The newly synthesized compounds are characterized on the basis of elemental analysis, IR, 1H NMR and mass spectral data. Some of the compounds are screened for their antibacterial and insecticidal activities

Synthesis and Characterization of 1,3,4-Thiadiazole and 1,3,4-Oxadiazole Derivatives Containing 2-Chloropyridin-5-yl-methyl Moiety.

2170-2174Reaction of 2-chloropyridine-5-acetic acid hydrazide 1 with aroyl isothiocyanates 2a-e yields 4-aroyl -1-(2-chloropyridine-5-acetyl)thiosemicarbazides 3a-e. The cyaclization of 3a-e with conc. sulphuric acid and with iodine in the presence of potassium iodide affords 2-chloro-5-(5-aroylamino-1,3,4-thidiazol -2-yl-methyl)pyridines 4a-e and 2-chloro-5-(5-aroylamino-1 ,3,4-oxadiazol-2-yl-methyl) pyridines 5a-e respectively

Synthesis and insecticidal activity of some 1,3,4-oxadiazoles derived from 2-chloropyridine-5-acetic acid

864-868The synthesis of a number of 1,3,4-oxadiazoles 6a-e is described . 2-Chloropyridine-5-aeetic acid 3 is prepared starting from easily available 2-chl oro-5-chloromethylpyridine 1, via 2-chloro-5 -cyanomethylpyridine 2. Esterification of 3 with methanol in the presence of H2SO4 gives the corresponding methyl ester 4. Hydrazinolysis of 4 with hydrazin hydrate affords 2-chloropyridine-5-acetic acid hydrazide 5. Hydrazide 5 on reacting with aroyl chlorides in the presence of POCl3 yields 2-chloro-5 -(5-aryl-1 ,3,4-oxadiazol-2 -yl)methylpyridines 6a-c

Synthesis and characterization of 1,3,4-thiadiazole and 1,3,4-oxadiazole derivatives containing 2-chloropyridin-5-yl-methyl moiety

2170-2174Reaction of 2-chloropyridine-5-acetic acid hydrazide 1 with aroyl isothiocyanates 2a-e yields 4-aroyl -1-(2-chloropyridine-5-acetyl)thiosemicarbazides 3a-e. The cyaclization of 3a-e with conc. sulphuric acid and with iodine in the presence of potassium iodide affords 2-chloro-5-(5-aroylamino-1,3,4-thidiazol -2-yl-methyl)pyridines 4a-e and 2-chloro-5-(5-aroylamino-1 ,3,4-oxadiazol-2-yl-methyl) pyridines 5a-e respectively

Circulation of third-generation cephalosporin resistant Salmonella Typhi in Mumbai, India

We report the persistent circulation of third-generation cephalosporin resistant Salmonella Typhi in Mumbai, linked to the acquisition and maintenance of a previously characterized IncX3 plasmid carrying the ESBL gene blaSHV-12 and the fluoroquinolone resistance gene qnrB7 in the genetic context of a triple mutant also associated with fluoroquinolone resistance

Circulation of third-generation cephalosporin resistant Salmonella Typhi in Mumbai, India

We report the persistent circulation of third-generation cephalosporin resistant Salmonella Typhi in Mumbai, linked to the acquisition and maintenance of a previously characterized IncX3 plasmid carrying the ESBL gene blaSHV-12 and the fluoroquinolone resistance gene qnrB7 in the genetic context of a triple mutant also associated with fluoroquinolone resistance