Natural & Applied Sciences

Natural & Applied Sciences Research Papers/Topics

Comparison of vitronectin and fibronectin as substrates during the culture of human embryonic stem cells

Abstract: The feeder free culturing of pluripotent stem cells aims to eliminate the use of mouse embryonic fibroblasts (MEFs) as substrate during in vitro culturing. Here, the potential of fibronectin and vitronectin to keep stem cells undifferentiated was compared using two different stem cell lines (HUES1 and HUES7). Cells were cultured on vitronectin and fibronectin for 3 weeks. Results showed that cells cultured in fibronectin appear to adhere slightly well initially while those in vitro...

Delay bounded multi-source multicast in software-defined networking

Abstract: Software-Defined Networking (SDN) is the next generation network architecture with exciting application prospects. The control function in SDN is decoupled from the data forwarding plane, hence it provides a new centralized architecture with flexible network resource management. Although SDN is attracting much attention from both industry and research, its advantage over the traditional networks has not been fully utilized. Multicast is designed to deliver content to multiple desti...

Security of quantum-key-distribution protocol by using the post-selection technique

Abstract: The post-selection technique was proposed by Christandl, König, and Renner [Phys. Rev. Lett. 102, 020504 (2009)] to simplify the security of quantum-key-distribution schemes. This work applies this technique to derive the security bounds for the six-state Scarani-Acin-Rigbordy-Gisin 2004 quantum key distribution protocol. This protocol can extract secure keys from a source emitting multi-photons due to its robustness from photon number splitting attacks, making it a good candidate...

Comparison of user satisfaction between Text and Virtual Reality Based Expert Systems for diagnosing cattle diseases

Abstract: Even though usability testing of software applications has been studied for decades, little empirical researches have been conducted in Agriculture domain, especially in comparing the usability of none- immersive virtual reality and text based diagnosis expert systems for diagnosing cattle diseases. A quasi -experimental research was conducted in which 62 cattle farmers both commercial and subsistent used either a non-virtual reality based (System A) or a text-based (System B) expe...

Multi-parametric approach for multilevel multi-leader-multi-follower games using equivalent reformulations

Abstract: Multilevel multi-leader multi-follower games address compromises among multiple interacting decision agents within a hierarchical system in which multiple followers are involved at each lower-level unit and more than one decision maker (multiple leaders) are involved in the upper-level. The leaders' decisions are affected not only by reactions of the followers but also by various relationships among the leaders themselves. In general, multiple-leaders multiple-followers (MLMF) game...

Intelligent load balancing techniques in software defined networks : a survey

Abstract: In the current technology driven era, the use of devices that connect to the internet has increased significantly. Consequently, there has been a significant increase in internet traffic. Some of the challenges that arise from the increased traffic include, but are not limited to, multiple clients on a single server (which can result in denial of service (DoS)), difficulty in network scalability, and poor service availability. One of the solutions proposed in literature, to mitigat...

Antibacterial potential of extracts of the roots of Zingiber officinale against bacterial strains commonly associated with nosocomial infections

Abstract: Zingiber officinale, commonly known as ginger, has been used as a medicinal plant for decades for medical and culinary purposes. This study aimed to determine the antimicrobial potential of ginger root extracts using the Kirby-Bayer agar diffusion method to compare the zones of inhibition of the extracts to those of synthetic antibiotics against five clinical bacterial pathogens (Escherichia coli, Pseudomonas aeruginosa, taphylococcus aureus, Enterobacter aerogenes and Klebsiella p...

The exponentiated odd weibull-topp-leone-g family of distributions: model, properties and applications

Abstract: In this paper, a new generalized family of distributions called the exponentiated odd Weibull-Topp-Leone-G (EOW-TL-G) family of distributions is presented. A linear representation of the proposed model is also presented. A simulation study to examine the consistency of the maximum likelihood estimates is conducted. Usefulness of the new proposed model was assessed by means of applications to two real data examples.

Split equality variational inequality problems for pseudomonotone mappings in Banach spaces

Abstract: A new algorithm for approximating solutions of the split equality variational inequality problems (SEVIP) for pseudomonotone mappings in the setting of Banach spaces is introduced. Strong convergence of the sequence generated by the proposed algorithm to a solution of the SEVIP is then derived without assuming the Lipschitz continuity of the underlying mappings and without prior knowledge of operator norms of the bounded linear operators involved. In addition, we provide several ap...

A general split fixed point problem governed by demicontractive mappings in Banach spaces

Abstract: In this paper, we introduce an iterative process, which converges strongly to the solution of a general split fixed point problem governed by demicontractive mappings and prove strong convergence theorems in Banach spaces.

A Mathematical model of contact tracing during the 2014–2016 West African Ebola outbreak

Abstract: The 2014–2016 West African outbreak of Ebola Virus Disease (EVD) was the largest and most deadly to date. Contact tracing, following up those who may have been infected through contact with an infected individual to prevent secondary spread, plays a vital role in controlling such outbreaks. Our aim in this work was to mechanistically represent the contact tracing process to illustrate potential areas of improvement in managing contact tracing efforts. We also explored the role co...

Reference frame independent twin field quantum key distribution with source flaws

Abstract: The trade-off between distance and secret key generation rate remains one of the major challenges in the practical implementation of quantum key distribution (QKD). As a solution, a twin field QKD protocol was proposed by Lucamarini et al (2018) to address this challenge. In this protocol, the achievable secret key rate scales with the square root of channel transmittance and can surpass the secret key capacity for repeaterless QKD. However, the protocol exploits phase to encode in...

Antibacterial activity of 2-Picolyl-polypyridyl-based Ruthenium (II/III) complexes on non-drug-resistant and drug-resistant bacteria

Abstract: A new hexadentate 2-picolyl-polypyridyl-based ligand (4, 4’-(butane-1, 4-diylbis(oxy))bis(N, N-bis(pyridin-2-ylmethyl)aniline)) (2BUT) (1) and its corresponding Ru(II/III) complexes were synthesized and characterized, followed by assessment of their possible bioactive properties towards drug-resistant and non-drug-resistant bacteria. Spectroscopic characterization of the ligand was done using proton NMR, FTIR, and ESI-MS, which showed that the ligand was successfully synthesized....

The split equality fixed point problem for quasi-pseudo-contractive mappings without prior knowledge of norms

Abstract: Recently, Chang et al. (2015) constructed an algorithm that converges weakly to the solution of the split equality fixed point problem for quasi-pseudo-contractive mappings under some suitable conditions. They also showed that strong convergence is obtained in the case when the quasi-pseudo-contractive mappings are semi-compact. In this article, we construct an algorithm for quasi-pseudo-contractive mappings that always converge strongly to some solution of the split equality fixed...

An innovative microwave-assisted one-step green synthetic approach of biowaste derived fluorescent carbon-dot invisible ink for currency anti-counterfeiting applications

Abstract: The quest for the design and synthesis of carbon dots with anti-counterfeit properties that are derived via green, environmentally friendly and economical procedures is a continuous process. Carbon dots (C-dots) derived from biowaste are cheap to synthesize, possess good photo-stabilityand high synthetic yield, making them applicable in the anti-counterfeiting of currency. Herein, we report a novel eco-friendly, cheaper, and faster method for the synthesis of carbon dots with stron...


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