Standard for the Quantification of a Sterilization Effect Using an Artificial Intelligence Disinfection Robot

Recent outbreaks and the worldwide spread of COVID-19 have challenged mankind with unprecedented difficulties. The introduction of autonomous disinfection robots appears to be indispensable as consistent sterilization is in desperate demand under limited manpower. In this study, we developed an autonomous navigation robot capable of recognizing objects and locations with a high probability of contamination and capable of providing quantified sterilization effects. In order to quantify the 99.9% sterilization effect of various bacterial strains, as representative contaminants with robots operated under different modules, the operating parameters of the moving speed, distance between the sample and the robot, and the radiation angle were determined. We anticipate that the sterilization effect data we obtained with our disinfection robot, to the best of our knowledge, for the first time, will serve as a type of stepping stone, leading to practical applications at various sites requiring disinfection.

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Simple Formulas for Performance Parameters Used in Elastohydrodynamically Lubricated Line Contacts

Journal of Tribology ◽

10.1115/1.3261900 ◽

1989 ◽

Vol 111 (2) ◽

pp. 246-251 ◽

Cited By ~ 61

Author(s):

Ping Pan ◽

B. J. Hamrock

Keyword(s):

Film Thickness ◽

Curve Fitting ◽

Center Of Pressure ◽

Operating Parameters ◽

Performance Parameters ◽

Practical Applications ◽

Line Contacts ◽

Pressure Spike

The film thickness and pressure in elastohydrodynamically lubricated conjunctions have been evaluated numerically for a rather complete range of operating parameters (dimensionless load, speed, and materials parameters) normally experienced in practical applications. From the film thickness and pressure throughout the conjunction a number of performance parameters were evaluated. By curve fitting the data, formulas were obtained that allow easy evaluation of the amplitude and location of the pressure spike, the minimum and central film thicknesses, the value of ρeHe, and the center of pressure.

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Characterization of a Novel Fructosyltransferase from Lactobacillus reuteri That Synthesizes High-Molecular-Weight Inulin and Inulin Oligosaccharides

Applied and Environmental Microbiology ◽

10.1128/aem.68.9.4390-4398.2002 ◽

2002 ◽

Vol 68 (9) ◽

pp. 4390-4398 ◽

Cited By ~ 104

Author(s):

S. A. F. T. van Hijum ◽

G. H. van Geel-Schutten ◽

H. Rahaoui ◽

M. J. E. C. van der Maarel ◽

L. Dijkhuizen

Keyword(s):

Molecular Weight ◽

High Molecular Weight ◽

Lactobacillus Reuteri ◽

Bacterial Strains ◽

Potential Health ◽

Isolation And Characterization ◽

A Cell ◽

Encoding Gene ◽

First Time

ABSTRACT Fructosyltransferase (FTF) enzymes produce fructose polymers (fructans) from sucrose. Here, we report the isolation and characterization of an FTF-encoding gene from Lactobacillus reuteri strain 121. A C-terminally truncated version of the ftf gene was successfully expressed in Escherichia coli. When incubated with sucrose, the purified recombinant FTF enzyme produced large amounts of fructo-oligosaccharides (FOS) with β-(2→1)-linked fructosyl units, plus a high-molecular-weight fructan polymer (>107) with β-(2→1) linkages (an inulin). FOS, but not inulin, was found in supernatants of L. reuteri strain 121 cultures grown on medium containing sucrose. Bacterial inulin production has been reported for only Streptococcus mutans strains. FOS production has been reported for a few bacterial strains. This paper reports the first-time isolation and molecular characterization of (i) a Lactobacillus ftf gene, (ii) an inulosucrase associated with a generally regarded as safe bacterium, (iii) an FTF enzyme synthesizing both a high molecular weight inulin and FOS, and (iv) an FTF protein containing a cell wall-anchoring LPXTG motif. The biological relevance and potential health benefits of an inulosucrase associated with an L. reuteri strain remain to be established.

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Efficacy of Cavern Isolates for Biodegradation of Synthetic Plastic

Letters in Organic Chemistry ◽

10.2174/1570178618666210602161857 ◽

2021 ◽

Vol 18 ◽

Author(s):

Jamila Tabassum ◽

Muhammad Luqman ◽

Fariha Hasan ◽

Fariha Arooj ◽

Saif Ur Rehman Kashif ◽

...

Keyword(s):

Environmental Concern ◽

Mechanical Damage ◽

Bacterial Consortium ◽

Alcaligenes Faecalis ◽

Bacterial Strains ◽

Ldpe Film ◽

Intermediate Metabolites ◽

Bacillus Sonorensis ◽

Physical Changes ◽

First Time

: Synthetic plastic waste management is a tenacious environmental concern at the global level. Although all types of synthetic plastics are a nuisance to the environment, however, versatility and one time use have made polyethylene (PE) a foremost environmental issue. The current study has investigated cavern bacterial strains isolated from PE samples from San Giovanni cave, Sardinia, Italy for their efficacy to biodegrade low-density polyethylene (LDPE) film. It was an initial effort to use cavern bacteria in plastic biodegradation studies. Chemical and physical changes in the composition of LDPE were studied by Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) after incubation with the bacterial consortium for two months. Collected cavern PE plastic samples were also studied for biodegradation after incubation in nutrient broth for two months. FTIR revealed obvious signs of degradation with the appearance of two new peaks of functional groups, nitriles (C≡N) and amines (N-H) in LDPE film, which are intermediate metabolites of β- oxidation pathway. An increase in various existing peaks of several intermediate metabolites including aldehydes, ketones, alcohols, and carboxylic acids, were also observed in experimental LDPE compared to control. Peaks of alkanes decreased significantly owing to cavern bacterial activity. SEM revealed biofilm formation on experimental LDPE surface with substantial mechanical damage. Similar signs of degradation were observed in the cavern PE samples. Four bacterial strains in the current consortium, including Bacillus sonorensis, Bacillus subtilis, Aneurinibacillus spp., and Alcaligenes faecalis are first time reported to be linked with biodegradation of plastics. The cavern bacteria under study have the potential to biodegrade LDPE.

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Negligible Voltage Hysteresis with Strong Anionic Redox in Conventional Battery Electrode

10.26434/chemrxiv.11777322.v1 ◽

2020 ◽

Author(s):

Kehua Dai ◽

Jing Mao ◽

Zengqing Zhuo ◽

Guo Ai ◽

Wenfeng Mao ◽

...

Keyword(s):

Quantitative Analysis ◽

Redox Reactions ◽

Coulombic Efficiency ◽

Redox Systems ◽

Redox Mechanism ◽

Practical Applications ◽

Battery Electrode ◽

Voltage Hysteresis ◽

First Time ◽

Initial Coulombic Efficiency

<div>Lattice oxygen redox reactions (ORR) offers opportunities for developing highcapacity batteries, however, suffers the notoriously high voltage hysteresis and low initial coulombic efficiency, which hinder its practical applications. Particularly, ORR was widely considered inherent to these kinetic issues. In this paper, unambiguous evidence of strong and reversible ORR is found in Na2/3Ni1/3Mn2/3O2, which displays negligible voltage hysteresis (0.1 V) and high initial coulombic efficiency with a highly stable electrochemical profile. Our independent and quantitative analysis of all the Ni, Mn and O states consistently interpret the redox mechanism of Na2/3Ni1/3Mn2/3O2, which reveals, for the first time, a conventional 3d transition-metal ORR system with facile kinetics and highly stable electrochemical profile that previously found only in cationic redox systems.</div>

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Diversity of nodular bacteria ofScorpiurus muricatusin western Algeria and their impact on plant growth

Canadian Journal of Microbiology ◽

10.1139/cjm-2016-0493 ◽

2017 ◽

Vol 63 (5) ◽

pp. 450-463 ◽

Cited By ~ 2

Author(s):

Zoulikha Bouchiba ◽

Zineb Faiza Boukhatem ◽

Zohra Ighilhariz ◽

Nouria Derkaoui ◽

Benaissa Kerdouh ◽

...

Keyword(s):

Plant Growth ◽

Rhizobium Leguminosarum ◽

Root Nodules ◽

Pcr Amplification ◽

Nucleotide Sequencing ◽

Rrna Gene ◽

Bacterial Strains ◽

Single Strain ◽

Western Algeria ◽

First Time

A total of 51 bacterial strains were isolated from root nodules of Scorpiurus muricatus sampled from 6 regions of western Algeria. Strain diversity was assessed by rep-PCR amplification fingerprinting, which grouped the isolates into 28 different clusters. Partial nucleotide sequencing of the 16S rRNA gene and BLAST analysis revealed that root nodules of S. muricatus were colonized by different species close to Rhizobium vignae, Rhizobium radiobacter, Rhizobium leguminosarum, Phyllobacterium ifriqiyense, Phyllobacterium endophyticum, Starkeya sp., and Pseudomonas sp. However, none of these strains was able to form nodules on its host plant; even nodC was present in a single strain (SMT8a). The inoculation test showed a great improvement in the growth of inoculated plants compared with noninoculated control plants. A significant amount of indole acetic acid was produced by some strains, but only 2 strains could solubilize phosphate. In this report we described for the first time the diversity of bacteria isolated from root nodules of S. muricatus growing in different regions in western Algeria and demonstrated their potential use in promoting plant growth.

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Solitary wave solution of nonlinear Bogoyavlenskii system by variational analysis method

International Journal of Modern Physics B ◽

10.1142/s0217979222500151 ◽

2021 ◽

Author(s):

KangLe Wang

Keyword(s):

Solitary Wave ◽

Variational Analysis ◽

Solitary Wave Solution ◽

Solitary Wave Solutions ◽

Analysis Method ◽

Soliton Theory ◽

Practical Applications ◽

The Road ◽

Wave Solutions ◽

First Time

In this work, the Bogoyavlenskii system (BS) and fractal BS are investigated by variational method for the first time. An efficient and simple scheme is proposed to seek their exact solitary wave solutions, which is called variational analysis method. The novel scheme requires only two steps, making it much attractive in practical applications, and a good result is obtained. This paper cleans up the road to the exact solitions, and it sheds a new light on the soliton theory. Finally, the physical properties of solitary wave solutions obtained are analyzed by some simulation figures.

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Leonhard Euler and the Theory of Ships

Journal of Ship Research ◽

10.5957/jsr.2008.52.4.274 ◽

2008 ◽

Vol 52 (04) ◽

pp. 274-290

Author(s):

Horst Nowacki

Keyword(s):

18Th Century ◽

Scientific Discipline ◽

Scientific Development ◽

Modern Theory ◽

Practical Applications ◽

Stage Of Development ◽

Scientific World ◽

Leonhard Euler ◽

The Rich ◽

First Time

On April 15, 2007, the scientific world commemorated Leonhard Euler's 300th birthday. Euler's eminent work has become famous in many fields: mathematics, mechanics, optics, acoustics, astronomy, and geodesy, even in the theory of music. This article will recall his no less distinguished contributions to the founding of the modern theory of ships. These are not so widely known to the general professional public. In laying these foundations in ship theory, as in other fields, Euler was seeking "first principles, generality, order and above all clarity." This article will highlight those achievements for which we owe him our gratitude. There is no doubt that Leonhard Euler was one of the founders of the modern theory of ships. He raised many fundamental questions for the first time and through all phases of his professional lifetime devoted himself to subjects of ship theory. Thereby he gave a unique profile to this still nascent scientific discipline. Many of his approaches have been of lasting, incisive influence on the structure of this field. Some of his ideas have become so much a matter of routine today that we have forgotten their descent from Euler. This article will synoptically review Euler's contributions to the foundation of this discipline, will correlate them with the stages of Euler's own scientific development, embedded in the rich environment of scientific enlightenment in the 18th century, and will appreciate the value of his lasting aftereffects until today. The same example will serve to recognize the fertile field of tension always existing between Euler's fundamental orientation and his desire to make contributions to practical applications, which has remained characteristic of ship theory to the present day. Without claiming completeness in detail, this article aims at giving a coherent overview of Euler's approaches and objectives in this discipline. This synopsis will be presented primarily from the viewpoint of engineering science in its current stage of development.

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A sensitive enzyme-free lactic acid sensor based on NiO nanoparticles for practical applications

Analytical Methods ◽

10.1039/c9ay00516a ◽

2019 ◽

Vol 11 (28) ◽

pp. 3578-3583 ◽

Cited By ~ 7

Author(s):

Sidra Amin ◽

Aneela Tahira ◽

Amber Solangi ◽

Raffaello Mazzaro ◽

Zafar Hussain Ibupoto ◽

...

Keyword(s):

Lactic Acid ◽

Glassy Carbon ◽

Electrochemical Sensing ◽

Carbon Electrode ◽

Nio Nanoparticles ◽

Modified Glassy Carbon Electrode ◽

Practical Applications ◽

Sensing Platform ◽

First Time

A facile and efficient electrochemical sensing platform has been successfully exploited for the first time for the determination of lactic acid using a nickel oxide (NiO) nanoparticle-modified glassy carbon electrode (GCE).

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Designing Multifunctional Protective PVC Electrospun Fibers with Tunable Properties

Polymers ◽

10.3390/polym12092086 ◽

2020 ◽

Vol 12 (9) ◽

pp. 2086

Author(s):

Pedro J. Rivero ◽

Iker Rosagaray ◽

Juan P. Fuertes ◽

José F. Palacio ◽

Rafael J. Rodríguez

Keyword(s):

Fiber Diameter ◽

Electrospinning Process ◽

Operating Parameters ◽

Electrospun Fibers ◽

Polymeric Precursor ◽

Operational Parameters ◽

Electrospinning Technique ◽

Coating Morphology ◽

Hydrophobic Nature ◽

First Time

In this work, the electrospinning technique is used for the fabrication of electrospun functional fibers with desired properties in order to show a superhydrophobic behavior. With the aim to obtain a coating with the best properties, a design of experiments (DoE) has been performed by controlling several inputs operating parameters, such as applied voltage, flow rate, and precursor polymeric concentration. In this work, the reference substrate to be coated is the aluminum alloy (60661T6), whereas the polymeric precursor is the polyvinyl chloride (PVC) which presents an intrinsic hydrophobic nature. Finally, in order to evaluate the coating morphology for the better performance, the following parameters—such as fiber diameter, surface roughness (Ra, Rq), optical properties, corrosion behavior, and wettability—have been deeply analyzed. To sum up, this is the first time that DoE has been used for the optimization of superhydrophobic or anticorrosive surfaces by using PVC precursor for the prediction of an adequate surface morphology as a function of the input operational parameters derived from electrospinning process with the aim to validate better performance.

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Genetic Diversity and Aggressiveness of Ralstonia solanacearum Strains Causing Bacterial Wilt of Potato in Uruguay

Plant Disease ◽

10.1094/pdis-09-10-0626 ◽

2011 ◽

Vol 95 (10) ◽

pp. 1292-1301 ◽

Cited By ~ 30

Author(s):

M. I. Siri ◽

A. Sanabria ◽

M. J. Pianzzola

Keyword(s):

Genetic Diversity ◽

Bacterial Wilt ◽

Ralstonia Solanacearum ◽

Potato Tubers ◽

Bacterial Strains ◽

Potato Plants ◽

Polymerase Chain ◽

First Time ◽

Different Levels

Bacterial wilt, caused by Ralstonia solanacearum, is a major disease affecting potato (Solanum tuberosum) production worldwide. Although local reports suggest that the disease is widespread in Uruguay, characterization of prevalent R. solanacearum strains in that country has not been done. In all, 28 strains of R. solanacearum isolated from major potato-growing areas in Uruguay were evaluated, including 26 strains isolated from potato tubers and 2 from soil samples. All strains belonged to phylotype IIB, sequevar 1 (race 3, biovar 2). Genetic diversity of strains was assessed by repetitive-sequence polymerase chain reaction, which showed that the Uruguayan strains constituted a homogeneous group. In contrast, inoculation of the strains on tomato and potato plants showed, for the first time, different levels of aggressiveness among R. solanacearum strains belonging to phylotype IIB, sequevar 1. Aggressiveness assays were also performed on accessions of S. commersonii, a wild species native to Uruguay that is a source of resistance for potato breeding. No significant interactions were found between bacterial strains and potato and S. commersonii genotypes, and differences in aggressiveness among R. solanacearum strains were consistent with previously identified groups based on tomato and potato inoculations. Moreover, variation in responses to R. solanacearum was observed among the S. commersonii accessions tested.

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