scholarly journals Silver-Deposited Nanoparticles on the Titanium Nanotubes Surface as a Promising Antibacterial Material into Implants

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 92
Author(s):  
Alina Năstaca Coman ◽  
Anca Mare ◽  
Corneliu Tanase ◽  
Eugen Bud ◽  
Aura Rusu
Keyword(s):  
Antibacterial Activity ◽  
Bacterial Resistance ◽  
Research Field ◽  
Important Research ◽  
Main Disadvantage ◽  
Different Types ◽  
Antibacterial Material ◽  
Antibacterial Capacity

The main disadvantage of the implants is the associated infections. Therefore, in the long term, the possibility of improving the antibacterial capacity of different types of implants (dental, orthopedic) is being researched. The severity of the problem lies in the increasing bacterial resistance and finding appropriate alternative treatments for infectious diseases, which is an important research field nowadays. The purpose of this review is to draw a parallel between different studies analyzing the antibacterial activity and mechanism of silver nanoparticles (NP Ag) deposited on the titanium nanotubes (NTT), as well as the analysis of the NP Ag toxicity. This review also provides an overview of the synthesis and characterization of TiO2-derived nanotubes (NT). Thus, the analysis aims to present the existing knowledge to better understand the NP Ag implants benefits and their antibacterial activity.

Vancomycin-hybrid bimetallic Au/Ag composite nanoparticles: preparation of the nanoparticles and characterization of the antibacterial activity

2017 ◽  
Vol 41 (13) ◽  
pp. 5276-5279 ◽  
Author(s):  
Zhentan Lu ◽  
Jiaqi Zhang ◽  
Zhenguo Yu ◽  
Xing Liu ◽  
Zhifeng Zhang ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Bacterial Resistance ◽  
Composite Nanoparticles

The Bimetallic Au/Ag composite nanoparticles have enhanced antibacterial activity and weak bacterial resistance.

scholarly journals Synthesis and Antibacterial Activity of Novel Schiff Bases of Thiosemicarbazone Derivatives With Adamantane Moiety

2021 ◽  
Author(s):  
Jiahui Zhu ◽  
Guosheng Teng ◽  
Dongfeng Li ◽  
Ruibin Hou ◽  
Yan Xia
Keyword(s):  
Antibacterial Activity ◽  
Antibacterial Agents ◽  
Bacterial Resistance ◽  
Inhibitory Effect ◽  
Negative Bacterium ◽  
Gram Negative ◽  
Major Threat ◽  
Antibiotic Drugs

Abstract Increased bacterial resistance to antibiotics is a major threat to human health, and it is particularly important to develop novel antibiotic drugs. Here, we designed a series of Schiff base thiosemicarbazone derivatives containing an adamantane moiety, and carried out structural characterization of the compounds and in vitro antibacterial activity tests. Compound 7e was as effective as the commonly-used antibiotic ampicillin against the Gram-negative bacterium Escherichia coli, and compound 7g had a good inhibitory effect against Gram-positive Bacillus subtilis. These findings provide data for the development of better thiosemicarbazone antibacterial agents.

scholarly journals Review on double-gate MOSFETs and FinFETs modeling

2013 ◽  
Vol 26 (3) ◽  
pp. 197-213 ◽  
Author(s):  
A. Cerdeira ◽  
M. Estrada ◽  
J. Alvarado ◽  
I. Garduño ◽  
E. Contreras ◽  
...  
Keyword(s):  
Circuit Design ◽  
Analog Circuit ◽  
Research Field ◽  
Double Gate ◽  
Analog Circuit Design ◽  
Important Research ◽  
Compact Models

The development of compact models for double-gate (DG) MOSFETs and FinFETs necessary in circuit simulators is an important research field, which allows the efficient practical characterization of these devices, as well as their application in analog circuit design. In this paper we review and assess different approaches for developing core and complete compact models for DG MOSFETs and FinFETs.

scholarly journals Porcine Myeloid Antimicrobial Peptides: A Review of the Activity and Latest Advances

2021 ◽  
Vol 8 ◽  
Author(s):  
Shuaibing Shi ◽  
Tengfei Shen ◽  
Yongqing Liu ◽  
Liangliang Chen ◽  
Chen Wang ◽  
...  
Keyword(s):  
Antimicrobial Peptides ◽  
Bacterial Resistance ◽  
Biological Activities ◽  
Structural Characteristics ◽  
Animal Husbandry ◽  
Global Public Health ◽  
Important Research ◽  
Antimicrobial Drugs ◽  
Important Research Topic

Traditional antibiotics have made great contributions to human health and animal husbandry since the discovery of penicillin in 1928, but bacterial resistance and drug residues are growing threats to global public health due to the long-term uncontrolled application of antibiotics. There is a critical need to develop new antimicrobial drugs to replace antibiotics. Antimicrobial peptides (AMPs) are distributed in all kingdoms of life, presenting activity against pathogens as well as anticancer, anti-inflammatory, and immunomodulatory activities; consequently, they have prospects as new potential alternatives to antibiotics. Porcine myeloid antimicrobial peptides (PMAPs), the porcine cathelicidin family of AMPs, have been reported in the literature in recent years. PMAPs have become an important research topic due to their strong antibacterial activity. This review focuses on the universal trends in the biochemical parameters, structural characteristics and biological activities of PMAPs.

Preparation and characterization of SiO2/polydopamine/Ag nanocomposites with long-term antibacterial activity

2014 ◽  
Vol 40 (4) ◽  
pp. 5605-5609 ◽  
Author(s):  
Yaohua Dong ◽  
Tao Liu ◽  
Shibin Sun ◽  
Xueting Chang ◽  
Na Guo
Keyword(s):  
Antibacterial Activity

scholarly journals Infrared spectroscopy of exoplanets: observational constraints

2014 ◽  
Vol 372 (2014) ◽  
pp. 20130083 ◽  
Author(s):  
Thérèse Encrenaz
Keyword(s):  
Infrared Spectroscopy ◽  
Extrasolar Planets ◽  
Spectroscopic Characterization ◽  
Research Area ◽  
Research Field ◽  
Resolving Power ◽  
Observational Constraints ◽  
Different Types ◽  
New Research

The exploration of transiting extrasolar planets is an exploding research area in astronomy. With more than 400 transiting exoplanets identified so far, these discoveries have made possible the development of a new research field, the spectroscopic characterization of exoplanets' atmospheres, using both primary and secondary transits. However, these observations have been so far limited to a small number of targets. In this paper, we first review the advantages and limitations of both primary and secondary transit methods. Then, we analyse what kind of infrared spectra can be expected for different types of planets and discuss how to optimize the spectral range and the resolving power of the observations. Finally, we propose a list of favourable targets for present and future ground-based observations.

Electron microscopic characterization of diamond thin films and substrates for diamond heteroepitaxial growth

1989 ◽  
Vol 47 ◽  
pp. 592-593
Author(s):  
J.B. Posthill ◽  
R.P. Burns ◽  
R.A. Rudder ◽  
Y.H. Lee ◽  
R.J. Markunas ◽  
...  
Keyword(s):  
Thin Films ◽  
Wide Band ◽  
Deposition Process ◽  
Heteroepitaxial Growth ◽  
Electron Microscopic ◽  
Wide Band Gap ◽  
Lattice Matching ◽  
Different Types ◽  
Diamond Thin Films

Because of diamond’s wide band gap, high thermal conductivity, high breakdown voltage and high radiation resistance, there is a growing interest in developing diamond-based devices for several new and demanding electronic applications. In developing this technology, there are several new challenges to be overcome. Much of our effort has been directed at developing a diamond deposition process that will permit controlled, epitaxial growth. Also, because of cost and size considerations, it is mandatory that a non-native substrate be developed for heteroepitaxial nucleation and growth of diamond thin films. To this end, we are currently investigating the use of Ni single crystals on which different types of epitaxial metals are grown by molecular beam epitaxy (MBE) for lattice matching to diamond as well as surface chemistry modification. This contribution reports briefly on our microscopic observations that are integral to these endeavors.

The Acute Effect of Alcohol on Various Memory Processes

2010 ◽  
Vol 24 (4) ◽  
pp. 249-252 ◽  
Author(s):  
Márk Molnár ◽  
Roland Boha ◽  
Balázs Czigler ◽  
Zsófia Anna Gaál
Keyword(s):  
Low Dose ◽  
Short Term Memory ◽  
Acute Effect ◽  
Long Term Memory ◽  
Term Memory ◽  
Memory Processes ◽  
Different Types ◽  
The Brain ◽  
Legal Consequences

This review surveys relevant and recent data of the pertinent literature regarding the acute effect of alcohol on various kinds of memory processes with special emphasis on working memory. The characteristics of different types of long-term memory (LTM) and short-term memory (STM) processes are summarized with an attempt to relate these to various structures in the brain. LTM is typically impaired by chronic alcohol intake but according to some data a single dose of ethanol may have long lasting effects if administered at a critically important age. The most commonly seen deleterious acute effect of alcohol to STM appears following large doses of ethanol in conditions of “binge drinking” causing the “blackout” phenomenon. However, with the application of various techniques and well-structured behavioral paradigms it is possible to detect, albeit occasionally, subtle changes of cognitive processes even as a result of a low dose of alcohol. These data may be important for the consideration of legal consequences of low-dose ethanol intake in conditions such as driving, etc.

Extraction and characterization of sea anemones compound and its Anti bacterial and hemolytic studies

2020 ◽  
Vol 10 (4) ◽  
pp. 93-97
Author(s):  
Anil Kumar A ◽  
Raja Sheker K ◽  
Naveen B ◽  
Abhilash G ◽  
Akila CR
Keyword(s):  
Antibacterial Activity ◽  
Focal Point ◽  
Haemolytic Activity ◽  
Klebsiella Pneumonia ◽  
Bacterial Strains ◽  
Sea Anemones ◽  
Marine Plants ◽  
Heteractis Magnifica ◽  
Trididemnum Solidum

Seas assets that give us a variety of characteristic items to control bacterial, contagious and viral ailment and mostly utilized for malignancy chemotherapy practically from spineless creatures, for example, bryozoans, wipes, delicate corals, coelenterates, ocean fans, ocean bunnies, molluscs and echinoderms. In the previous 30 - 40 years, marine plants and creatures have been the focal point of overall endeavours to characterize the regular results of the marine condition. Numerous marine characteristic items have been effectively exceptional to the last phases of clinical preliminaries, including dolastatin-10, a group of peptides disengaged from Indian ocean rabbit, Dollabella auricularia. Ecteinascidin-743 from mangrove tunicate Ecteinascidia turbinata, Didemnins was isolated from Caribbean tunicate Trididemnum solidum and Conopeptides from cone snails (Conus sp.), and a developing number of up-and-comers have been chosen as promising leads for expanded pre-clinical appraisals. Sea anemones possess numerous tentacles containing stinging cells or cnidocytes. The stinging cells are equipped with small organelles known as nematocysts. The two species of sea anemones namely, Heteractis magnificaandStichodactyla haddoni, were collected from Mandapam coastal waters of Ramanathapuram district, Tamilnadu, India. The Nematocyst was collected and centrifuged, and the supernatant was lyophilized and stored for further analysis. The amount of protein from Heteractis Magnifica and Stichodactyla haddoni was estimated. The crude extract has shown haemolytic activity on chicken blood and goat blood. In the antibacterial activity of the sea anemone against six bacterial strains Staphylococcus aureus, Salmonella typhii, Salmonella paratyphii, Klebsiella pneumonia, Vibrio cholerae, Pseudomonas aeruginosa. Antibacterial activity of H. Magnifica and S.haddoni was measured as the radius of the zone of inhibition.

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