SUMMARY: Survival of five genera of N2-fixing cyanobacteria were studied under salt and drought stress in clay and sand soil. These conditions considerably decreased the survival of the tested organisms. Nitrogenase activity was also decreased and this could be attributed to the reduced of heterocyst frequency under the experimental conditions. Apparently, Nostoc microscopicum and Rivulara natans appeared to be water stress-tolerant species and remained for long period. There is a scope for selection of cyanobacterial species more tolerant to harsh conditions to prepare commercial inoculants for Agronomic practice.

The main aim of this paper is to define and study a new confluent hypergeometric matrix function, say, (m,n)-Kummer's matrix function of two complex variables. The radius of regularity and recurrence relation on this function is established. The effect of differential operator on this function is investigated. We study the operation of a differential operator on the Hadamard product of two (m,n)-Kummer's matrix functions. Finally, we define the composite (m,n)-Kummer's matrix functions and the effect of differential operator on this function is investigated

The main aim of this paper is to define and study a new confluent hypergeometric matrix function, say, (m,n)-Kummer's matrix function of two complex variables. The radius of regularity and recurrence relation on this function is established. The effect of differential operator on this function is investigated. We study the operation of a differential operator on the Hadamard product of two (m,n)-Kummer's matrix functions. Finally, we define the composite (m,n)-Kummer's matrix functions and the effect of differential operator on this function is investigated

The main aim of this paper is to define and study a new confluent hypergeometric matrix function, say, (m,n)-Kummer's matrix function of two complex variables. The radius of regularity and recurrence relation on this function is established. The effect of differential operator on this function is investigated. We study the operation of a differential operator on the Hadamard product of two (m,n)-Kummer's matrix functions. Finally, we define the composite (m,n)-Kummer's matrix functions and the effect of differential operator on this function is investigated

The main aim of this paper is to define and study a new confluent hypergeometric matrix function, say, (m,n)-Kummer's matrix function of two complex variables. The radius of regularity and recurrence relation on this function is established. The effect of differential operator on this function is investigated. We study the operation of a differential operator on the Hadamard product of two (m,n)-Kummer's matrix functions. Finally, we define the composite (m,n)-Kummer's matrix functions and the effect of differential operator on this function is investigated

The main aim of this paper is to define a new polynomial, say, pseudo hyperbolic matrix functions, pseudo Hermite matrix polynomials and to study their properties. Some formulas related to an explicit representation, matrix recurrence relations are deduced, differential equations satisfied by them is presented, and the important role played in such a context by pseudo Hermite matrix polynomials are underlined.

The main aim of this paper is to define a new polynomial, say, pseudo hyperbolic matrix functions, pseudo Hermite matrix polynomials and to study their properties. Some formulas related to an explicit representation, matrix recurrence relations are deduced, differential equations satisfied by them is presented, and the important role played in such a context by pseudo Hermite matrix polynomials are underlined.

In this paper, we introduce a new generalization of the Hermite matrix polynomials expansions of some relevant matrix functions appearing in the solution of differential systems. An explicit representation and an expansion of the matrix exponential in a series of these matrix polynomials are obtained. Properties of Hermite matrix polynomials such as the recurrence formula permit an efficient computations of matrix functions are established. A new expansion of the matrix exponential for a wide class of matrices in terms of Hermite matrix polynomials is proposed.

In this paper, we introduce a new generalization of the Hermite matrix polynomials expansions of some relevant matrix functions appearing in the solution of differential systems. An explicit representation and an expansion of the matrix exponential in a series of these matrix polynomials are obtained. Properties of Hermite matrix polynomials such as the recurrence formula permit an efficient computations of matrix functions are established. A new expansion of the matrix exponential for a wide class of matrices in terms of Hermite matrix polynomials is proposed.

In this paper, we introduce a new generalization of the Hermite matrix polynomials expansions of some relevant matrix functions appearing in the solution of differential systems. An explicit representation and an expansion of the matrix exponential in a series of these matrix polynomials are obtained. Properties of Hermite matrix polynomials such as the recurrence formula permit an efficient computations of matrix functions are established. A new expansion of the matrix exponential for a wide class of matrices in terms of Hermite matrix polynomials is proposed.