Al-Mustansiriyah Journal of Science

Bacteria that cause wound infections were isolated and diagnosed from patients, who were hospitalized at the Martyr Al-Sadr Hospital from October 2019 to April 2020. Antibacterial effect of Quercus infectoria extract (aqueous and alcoholic) on the isolated bacteria has been studied. The results showed that the alcoholic extract has a higher antibacterial effect than the aqueous extract against Gram-positive bacteria like Staphylococcus aureus, Staphylococcus epidermidis, and Staphylococcus saprophyticus except Micrococcus roseus, which the effect of aqueous extract was higher than alcoholic extract, whereas aqueous and alcoholic extracts showed the same effect against Streptococcus sp.. The alcoholic extract has higher antibacterial effect than the aqueous extract against Gram-negative bacteria (Escherichia coli, Pseudomonas sp., Enterococcus faecalis, Shigella dysnteriae, Enterobacter sakazkii, citrobcter freundii and Alcaligenes faecalis) except proteus sp., which the aqueous extract was higher than alcoholic extract.

Generally, treatment of urinary tract infection (UTI) in children is a difficult task, due to development of high resistance against antibiotics. The object of this study is to investigate the greatest causative microorganisms, their susceptibility and resistance to antibiotics in children suffering from UTI in Baghdad. A total of 810 urine samples were collected from suspected cases of UTI in children patients of ages (1 day to 12 years) of both sexes. Urine specimens were examined by urinalysis and cultured for isolation of microbial agents. In this study, Bacterial growth was obtained in 202 samples (24.39%) out of 810 urine samples. Various pathogenic organisms were isolated, which represented by A) Gram-Negative bacilli include Escherichia coli (41.58%), Enterobacter spp. (13.68%), Proteus Mirabilis (12.78%), Acinetobacter spp. (4.45%), Providencia spp. (4.45%), Pseudomonas aeruginosa (3.46), Klebsiella pneumoniae (2.47%), Citrobacter spp.(0.49%), Salmonella Spp.(0.49%), B) Gram- Positive cocci: Staphylococcus aureus (11.38%), Enterococcus faecalis (1.98%) and Streptococcus agalactiae (1.48%) C) Candida albicans (0.9%).). According to antibiotic susceptibility test, mostly the isolates were resistant to Nalidixic acid (67.05%), cefotaxime (59.40%) and cefepime (50.49%). Mostly Gram-Negative bacilli were responsible for UTI, and maximum recurrent isolated bacteria were Escherichia coli. The isolated bacteria were found to be sensitive to Imipenem, Amikacin, and ciprofloxacin. Therefore, the selection of antibiotic therapy in UTI should depend on the native sensitivity form of the infecting organism.

Through this paper, we submitted some types of quasi normal operator is called be (k*-N)- quasi normal operator of order n defined on a Hilbert space H, this concept is generalized of some kinds of quasi normal operator appear recently form most researchers in the field of functional analysis, with some properties and characterization of this operator as well as, some basic operation such as addition and multiplication of these operators had been given, finally the relationships of this operator proved with some examples to illustrate conversely and introduce the sufficient conditions to satisfied this case with other types had been studied.

In this paper, Sumudu transformation (ST) of Caputo fractional derivative formulae are derived for linear fractional differential systems. This formula is applied with Mittage-Leffler function for certain homogenous and nonhomogenous fractional differential systems with nonzero initial conditions. Stability is discussed by means of the system's distinctive equation.

This paper studies the modified Pell polynomials. Some important properties of modified Pell polynomials are presented. An exact formula of modified Pell polynomials derivative in terms of modified Pell themselves is first derived with the proof and then a new relationship is constructed which relates the modified Pell polynomials expansion coefficients of a derivative in terms of their original expansion coefficients. An interesting new formula for the product operational matrix of modified Pell polynomials is also derived in this work. With modified Pell polynomials expansion scheme, the powers 1, x, …, xn are expressed in terms of such polynomials. The main goal of all presented formulas is to simplify the original equations and the determination of the coefficients of expansion based on modified Pell polynomials will be easy. Spectral techniques together with all the derived formulas of modified Pell polynomials are utilized to solve some singular initial value problems. Three test examples are solved in this work to illustrate the validity of the proposed method. The computational method is replaced by exact and explicit formulas. More accurate results are obtained than those presented by other existing methods in the literature.

In this paper, we introduced new definitions of the system of homogenous difference equations of order two; namely homogenous and semi homogenous system, where we focused on finding the equivalents for these definitions of order one as well as of order greater than one for the system of difference equations of the second order and given some examples. We also a given formula to find the power of the matrix that we used in this research.

In this paper, we present two gyroarea formulas (Möbius-Bretschneider’s formula and Möbius-Cagnoli’s formula) for Möbius gyroquadrilaterals in the Poincaré disc model of hyperbolic geometry.