Synthesis And Characterisation Of CdxZn1–xS Nanocomposites

CdxZn1 – xS nanoparticles have been synthesized using hydrothermal method. Structural characterization was done by XRD where the lattice structure gradually changes from hexagonal to cubic with increasing percentage of Zn inCdxZn1 – xS nanoparticles. Optical spectroscopy provided evidence that the absorption edges of those nanoparticles can be varied from blue to UV. The nanoparticles exhibit emission peaks that shift to shorter wavelength with increasing percentage of Zn in the compounds CdxZn1 – xS. The control of the composition of CdxZn1 – xS nanoparticles may lead the development of ideal materials for short wavelength diode laser applications. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/951

Invasion of Aureobasidium Pullulans in kidney and eyes of immunosuppressed patients

There were series of proven cases revealing opportunistic fungal infections in the cornea, cutaneous, subcutaneous and renal transplantpatients. Renal involvements of opportunistic mold in immunocompromised especially in renal transplant recipients have remaineda significant problem and a major cause of death worldwide. However, extensive literature reviews revealed no case of invasion inurolithiasis and rarely reported in endophthalmitis. Here, we report the case series of two rare cases related to a dematiaceous fungus,Aureobasidium pullulans. Both had an atypical presentation. Possible modes of entry and dissemination were discussed. Invasivesurgical procedures, frequent uses of antibiotics and steroid could possibly predispose to its invasion in immunocompromised patients.This organism was identified through molecular techniques since culture yielded no growth. There was a good outcome followingsurgical intervention in both cases

A System Dynamics Approach for Hospital Waste Management in a City in a Developing Country: The Case of Nablus, Palestine

Hospitals and health centers provide a variety of healthcare services and normally generate hazardous waste as well as general waste. General waste has a similar nature to that of municipal solid waste and therefore could be disposed of in municipal landfills. However, hazardous waste poses risks to public health, unless it is properly managed. The hospital waste management system encompasses many factors, i.e., number of beds, number of employees, level of service, population, birth rate, fertility rate, and not in my back yard (NIMBY) syndrome. Therefore, this management system requires a comprehensive analysis to determine the role of each factor and its influence on the whole system. In this research, a hospital waste management simulation model is presented based on the system dynamics technique to determine the interaction among these factors in the system using a software package, ithink. This model is used to estimate waste segregation as this is important in the hospital waste management system to minimize risk to public health. Real data has been obtained from a case study of the city of Nablus, Palestine to validate the model. The model exhibits wastes generated from three types of hospitals (private, charitable, and government) by considering the number of both inpatients and outpatients depending on the population of the city under study. The model also offers the facility to compare the total waste generated among these different types of hospitals and anticipate and predict the future generated waste both infectious and non-infectious and the treatment cost incurred

Approach to secure access of Internet of Things (IoT) using Federated Identity Management (FIM) Technology

In today’s timeline Internet of Things (IoT) is one of the fast-emerging and versatile technology. They are readily available for access from any part of the world, and they play a crucial role in combining existing home appliance and the internet. The challenge faced in this technology is ensuring the access of IoT devices over the internet using safe and secure procedures. Numerous threats can cause harm to an IoT device or the environment hosting it. In this paper, the aspect of secure access of IoT device over an infrastructure across the internet is focused. An application is designed by following the principles of Federated identity management (FIM) approach for secure access of any IoT devices over a network. After careful research of numerous ideas and published works, we have designed and implemented an application that uses JSON Web Token (JWT) for authentication and showcases greater time efficiency and exerts less computation stress on the IoT devices. An experiment has been performed to compare this with existing research and algorithm. Thus, ensuring faster access to IoT devices over the internet

A comprehensive review of 3D printing techniques for biomaterial-based scaffold fabrication in bone tissue engineering

Three-dimensional (3D) printing technology is developing as a dominant tool for biomedical engineering by supporting 3D cell culture within compound 3D biomimetic buildings. Biomaterial and Tissue engineering has developed as a favorable alternative method in the treatment of bones, teeth, and organs. This paper summarizes the current research status and attention of the 3D biomaterials scaffolds in bone tissue engineering applications. Several 3D scaffolds fabricated from several types of biodegradable materials have been established. The crucial topics of 3D printing techniques are recognized and deliberated with the future improvement of innovative biomaterials. There has been a prompt development in the applications of 3D printing in engineering customized implants, drug delivery devices, prostheses, and 3D scaffolds for regenerative medicine and tissue engineering. Medical 3D printing technologies are classified into the following categories: Fused Deposition Modeling (FDM), Extrusion-based 3D bioprinting, Selective Laser Sintering (SLS)/Selective Laser melting (SLM), Electron Beam Manufacturing (EBM), Stereolithography (SLA) and Digital Light Processing (DLP) printing techniques, and their clinical applications, different types of biomaterials currently used by researchers, and key limitations are discussed in detail. In Addition, the most advanced and commonly used metals, bioceramics, polymers, and composites in tissue engineering are briefly reviewed as well

An Innovative Approach to Manganese-Substituted Hydroxyapatite Coating on Zinc Oxide–Coated 316L SS for Implant Application

In this paper, the synthesis of porous manganese substituted hydroxyapatite (Mn-HAp) coating on zinc oxide (ZnO) coated stainless steel (316L SS) using the electrodeposition technique is reported. The structural, functional, morphological, and elemental analyses are characterized by various analytical techniques including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Results of electrochemical techniques such as cyclic polarization and impedance show that the Mn-HAp coating on ZnO coated 316L SS has the highest corrosion resistance in simulated body fluid (SBF) solution. Moreover, dissolution of metal ions was extremely reduced, as evaluated by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The adhesion and hardness of Mn-HAp/ZnO bilayer coatings have superior mechanical properties over individual coatings. Further, the biocompatibility of in vitro osteoblast attachment, cell viability, and live/dead assessment also confirmed the suitability of Mn-HAp/ZnO bilayer coating on 316L SS for orthopedic applications

3D-printed Biphasic Calcium Phosphate Scaffold to augment cytocompatibility evaluation for load-bearing implant applications

In this work, we developed and analyzed a biphasic calcium phosphate (BCP) bioceramic for bone regeneration using stereolithography (SLA). The SLA method is a promising additive manufacturing (AM) technique capable of creating BCp parts with high accuracy and efficiency. However, the ceramic suspension used in SLA exhibits significantly higher viscosity and is not environmentally friendly. Therefore, adequate preparation of a suspension with low viscosity and high solid loading is essential. In this paper, we optimized the effects of surfactant doses and solid loading on the BCp slurry, and initially examined the process parameters of photocuring, debinding, and sintering. The utilization of 9 wt % Disperbyk (BYK) with a 40 vol % loading of BCp bioceramics exhibited a reasonably low viscosity of 8.9 mPa·s at a shear level of 46.5 s−1. Functional and structural analyses confirmed that BCp was retained after photocuring and subsequent treatment, which were incorporated into the BYK dispersion. The 3D printed objects with different sintered temperatures, specifically at 1100 °C, 1200 °C, and 1300 °C, were further optimized. Additionally, the surface roughness, porosity, and mechanical properties of BCp green parts were systematically investigated. Most importantly, in vitro analysis of cell attachment, differentiation, and red alizarin analysis could support the application of bone regeneration

Post COVID pulmonary complications – A case series

COVID-19 patients are frequently coinfected by other microbial pathogens, adding to the severity of the cases and raising difficulty in the diagnosis, prognosis, and treatment. Pulmonary mucormycosis and invasive Aspergillosis are such life-threatening fungal infections. Risk factors include uncontrolled diabetes mellitus, hematological malignancies, solid organ transplantation, and chronic renal failure. Pulmonary emboli and pneumothorax have also been reported frequently in COVID-19 patients, especially in those who required invasive mechanical ventilation. Herein, we report four different cases of post COVID pulmonary complications. All four patients were evaluated with computed tomography thorax. Two patients had necrotizing pneumonia and sputum culture grew mucor and Aspergillus species, respectively. They were treated with intravenous antifungals. One patient had rifampicin-sensitive pulmonary tuberculosis (TB) and was started on antitubercular drugs. Both pulmonary mucormycosis and pulmonary TB patients had a segmental and subsegmental pulmonary embolism. They were managed with low-molecular-weight heparin. One patient had left pneumothorax, for which intercostal drainage was placed

Cyphellophora sp. Isolated from a Corneal Ulcer in the Human Eye

Cyphellophora is a black yeast-like fungus with most of the strains being isolated from soil and plants. It tends to cause sooty blotch and flyspeck disease in plants. In humans, it is known to cause superficial skin and nail infections. This report highlights the case of a patient who initially presented with a small corneal abrasion which rapidly progressed into a corneal ulcer after the patient did not respond to the initial conventional treatment. The laboratory results from the corneal scraping found it to be Cyphellophora sp