tAn analytical solution of the master equation for two qubits-field system, in the dispersive regime, areinvestigated. The qubits are initially in Werner states and the field in coherent state. Under the influence ofthe damping, the geometric measure of quantum discord (GMQD) and the measurement-induced nonlo-cality (MIN) are investigated. GMQD and MIN are compared and illustrated their different characteristics.It is found that under the influence of damping the phenomenon of the death occurs for GMQD, but thisphenomenon does not occur for MIN even when the damping parameter is high. The initial conditionsfor the qubits play an important role in the phenomenon of collapses and revivals for GMQD and MIN.

We analyze two identical qubits interacting with a single-mode quantized
radiation field, taking into account the influence of phase damping. The qubits are
assumed to be initially in a superposition of the excited and the ground states, and the
field is in a coherent state. The effects of the damping on the purity loss of the system
and different bipartite partitions of the system [field-two qubits, qubit–(field+qubit)]
through the tangles are considered. The effect of the damping on the entanglement of
field qubits state is evaluated by the negativity. It is noted that the phenomenon of death
and rebirth of the entanglement appears.With the increase in the phase parameter, this
phenomenon disappears.

By using quantum discord (QD), measurement induced non-locality (MIN) and negativity (QE), quantum correlation
and entanglement are investigated for two qubits in two different cases for the initial two qubitWerner states, taking into
account the influence of qubit damping. It is shown that there is no asymptotic decay for MIN while asymptotic decay
exists for QD and QE. Quantum correlations cannot be strengthened by introducing the damping. The appearance time
of stationary correlations gets shorter with the increase in the damping parameter. Finally, a uniform damping qubit can
affect the stationary correlations when the qubits are initially in an entangled state.

We investigate the death of entanglement and the purity loss of a two qubits–field system in the
dispersive regime with a reservoir. For an alternative entanglement measure, we calculate the negativity
of the eigenvalues of a partially transposed density matrix and compare it with the mutual entropy. A
new measure related to the mutual entropy, namely, the index of entropy, is proposed to measure the
degree of entanglement, and this agrees well with the negativity. We found that the entanglement has
a strong sensitivity to the phase damping. The asymptotic behavior of the field states, the two qubits,
and the total system fall into a mixed state. We treat the phenomena of death of entanglement and
purity as they arise from the effect of phase damping.

In this paper, we have presented an analytic solution for two 2-level
identical atoms interacting with a single-mode quantized radiation field, taking into
account the level shifts produced by Stark shift. We assume that the two atoms are
initially prepared in the exited state and the field in a coherent state.We investigate the
purity loss of the system and bipartite partitions of the system. The effects of the Stark
shift on the purity loss of the system and different bipartite partitions of the system
(field-two atoms, atom-(field+atom)) through the tangles are considered. In particular,
the effect of the Stark shift on the amount of entanglement between atoms and field is
evaluated by the negativity.

We investigate the quantum entanglement in a system of two moving atoms interacting with a
single mode field. An analytical solution for this system is obtained when both atoms are
initially in the excited state and the field is in a coherent state. We study the effects of atomic
motion and other parameters on the entanglement of the system and different bipartite
partitions of the system (field–two atoms, atom–(field+atom)) through the tangles. The effect
of atomic motion on the amount of entanglement between atoms and the field is also evaluated
through the negativity. The results show that atomic motion leads to the periodic death and
anabiosis of the entanglement between two moving atoms, and the time of the death and the
amplitude of the anabiosis of the entanglement between two moving atoms depend on the
coupling constant of two moving atoms and the parameter of the mode field.

The interaction of two 2-level atoms inside a resonant microcavity under stimulated
emission via multi-photon-transition is considered. An analytical solution for this
system when both atoms are initially in the exited state and the field in a coherent state is
obtained. Entanglement dynamics between the two atoms taking into account the effect of
the stimulated emission is studied by using various measures of entanglement. We compare
the results for these various measures, and discuss the entanglement induced due to the
stimulated emission.

An analytical solution for two identical 2-level atoms interacting with a single-mode quantized
radiation field in the presence of the Stark shift is obtained. Both atoms are prepared initially
in the excited state and the field in a coherent state. The phase distribution, phase variance and
Wigner function are investigated. The influence of the Stark shift on the Wigner function and
the phase properties is analysed.

Kojic acid is a wonderful fungal secondary metabolite that has several applications in the food, medical, and agriculture sectors. Many human diseases become resistant to normal antibiotics and normal treatments. We need to search for alternative treatment sources and understand their mode of action. Aspergillus flavus ASU45 (OL314748) was isolated from the caraway rhizosphere as a non-aflatoxin producer and identified genetically using 18S rRNA gene sequencing. After applying the Box-Behnken statistical design to maximize KA production, the production raised from 39.96 to 81.59 g/l utilizing (g/l) glucose 150, yeast extract 5, KH₂PO₄ 1, MgSO₄.7H₂O 2, and medium pH 3 with a coefficient (R²) of 98.45%. Extracted KA was characterized using FTIR, XRD, and a scanning electron microscope. Crystalized KA was an effective antibacterial agent against six human pathogenic bacteria (Bacillus cereus, Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia, Serratia marcescens, and Serratia plymuthica). KA achieves high inhibition activity against Bacillus cereus, K. pneumonia, and S. plymuthica at 100 μg/ml concentration by 2.75, 2.85, and 2.85 compared with chloramphenicol which gives inhibition zones 1, 1.1, and 1.6, respectively. Crystalized KA had anticancer activity versus three types of cancer cell lines (Mcf-7, HepG2, and Huh7) and demonstrated high cytotoxic capabilities on HepG-2 cells that propose strong antitumor potent of KA versus hepatocellular carcinoma. The antibacterial and anticancer modes of action were illustrated using the molecular docking technique. Crystalized kojic acid from a biological source represented a promising microbial metabolite that could be utilized as an alternative antibacterial and anticancer agent effectively.