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Number of results: 165
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Abstract

The main objective of this study was to assess the environmental impact of the subsurface geological structure in Nam Son landfill by hydrogeophysical method. The Electrical Resistivity Tomography (ERT), Self- -Potential (SP) and Very Low Frequency (VLF) method was used for geological structure investigation. Three profiles (total 900 m long) of two-dimensional ERT, VLF density sections and 180 SP data points scattered within the study area near the disposal site were implemented. Surface water and groundwater samples were collected from 10 sites in the area for hydrochemical analysis. Interpretations of geophysical data show a low resistivity zone (<15 Ω m), which appears to be a fully saturated zone with leachate from an open dumpsite. There is a good correlation between the geophysical investigations and the results of hydrochemical analysis.
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Authors and Affiliations

Nguyen Van Giang
Nguyen Trong Vu
Nguyen Ba Duan
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Abstract

In this paper an attempt to determine the relationship between the electrical resistivity and the tensile strength and hardness of cast iron of

carbon equivalent in the range from 3.93% to 4.48%. Tests were performed on the gray cast iron for 12 different melts with different

chemical composition. From one melt poured 6 samples. Based on the study of mechanical and electro-resistive determined variation

characteristics of tensile strength, hardness and resistivity as a function of the carbon equivalent. Then, regression equations were

developed as power functions describing the relationship between the resistivity of castings and their tensile strength and hardness. It was

found a high level of regression equations to measuring points, particularly with regard to the relationship Rm=f(ρ). The obtained

preliminary results indicate the possibility of application of the method of the resistance to rapid diagnostic casts on the production line,

when we are dealing with repeatable production, in this case non variable geometry of the product for which it has been determinated

before a regression equation.

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Authors and Affiliations

M. Bieroński
R. Kuś
O. Krasa
M. Koza
D. Książek
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Abstract

The paper describes the influence of graphite shape, size and amount to electrical properties of different cast irons. Experiments of electrical resistivity measurements were conducted during solidification of four different melts in different time intervals from melt treatment by inoculation and nodularization. Metallographic analyses were made in order to determine the shape, size, distribution and amount of graphite and correlate results with electrical resistivity measurements. It was found out that nodular graphite is giving the lowest electrical resistivity and is decreased during solidification. Electrical resistivity of lamellar cast iron is increased during solidification since lamellas interrupt metal matrix severely There is no significant difference in resistivity of vermicular cast iron from nodular cast iron. Smaller size of graphite and lower amount of graphite and higher amount of metal matrix also decrease resistivity.

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Authors and Affiliations

M. Petrič
P. Mrvar
P. Kastelic
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Abstract

Several national rice centers in Indonesia have used acetolactate synthase herbicide inhibitors for years, especially in several regions of Lampung and West Java provinces. This practice has led to the failure of the application of bensulfuron-methyl herbicide to control Monochoria vaginalis (Burm. f.) C. Presl. The purposes of this study were to confirm that the failure of herbicide application in several areas of the provinces of Lampung and West Java was caused by weed resistance, and to determine the level of resistance. A resistance test of M. vaginalis was performed using the whole plant pot test method and split plot design with three replications. Monochoria vaginalis which indicated resistance was sampled from several regions, namely Sapto Mulyo, Ramadewa, Sarijaya, and Kalentambo. The susceptible samples of M. vaginalis as a control were taken from Cibodas and Sumberagung. The six levels of doses of herbicide bensulfuron-methyl used were: 0, 80, 160, 320, 640 and 1,280 g ha–1. The experimental results show that M. vaginalis from Sapto Mulyo, Ramadewa, Kalentambo and Sarijaya was confirmed to have developed into weeds resistant to bensulfuron-methyl herbicide. Monochoria vaginalis from Saptomulyo, Kalentambo and Sarijaya were included in the high resistance category with a resistance ratio of more than 12, while M. vaginalis from Ramadewa was included in the moderate resistance category with a resistance ratio of 9.39.
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Authors and Affiliations

Denny Kurniadie
1
ORCID: ORCID
Ryan Widianto
2
Dedi Widayat
1
Uum Umiyati
1
Ceppy Nasahi
3

  1. Department of Agronomy, Faculty of Agriculture, Universitas Padjadjaran, Bandung, Indonesia
  2. Graduate student, Faculty of Agriculture, Universitas Padjadjaran, Bandung, Indonesia
  3. Department of Pest and Diseases, Faculty of Agriculture, Universitas Padjadjaran, Bandung, Indonesia
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Abstract

A revision of the standard approach to characterization of thin-semiconductor-layer Hall samples has been proposed. Our results show that simple checking of I(V) curve linearity at room temperature might be insufficient for correct determination of bias conditions of a sample before measurements of Hall effect. It is caused by the nonlinear behaviour of electrical contact layers, which should be treated together with the tested layer a priori as a metal-semiconductor-metal (MSM) structure. Our approach was examined with a Be-doped p-type InAs epitaxial layer, with four gold contacts. Despite using full high-quality photolithography a significant asymmetry in maximum differential resistance (Rd) values and positions relative to zero voltage (or current) value was observed for different contacts. This suggests that such characterization should be performed before each high-precision magneto-transport measurement in order to optimize the bias conditions.

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Authors and Affiliations

Andrzej Kowalewski
Jarosław Wróbel
Jacek Boguski
Kinga Gorczyca
Piotr Martyniuk
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Abstract

Since 1950, nerudian poetry explores humor’s expresive shades as a new aesthetic strategy to face personal and political turmoils. If such humor can be critical, it though becomes both a bitter miror, a stronghold and a releasing comfort.
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Authors and Affiliations

Marie-Laure Sara-de La Vaissière
1
ORCID: ORCID

  1. Institut Catholique de Paris, Islhhs / CRLA-ARCHIVOS
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Abstract

Antibiotic resistance has become a global public health concern in the last few years. Given the widespread rate of recurrence, increasing attention is being turned toward environmental pathways that potentially contribute to antibiotic resistance genes (ARGs) dissemination outside the clinical realm. In this study, a metagenome analysis of intestinal virus-like particle fraction (VLPs) from a wild coyote ( Canis latrans) revealed for the first time, multiple ARGs, such as B-lactamases and multidrug efflux pumps. Description of ARGs presence in natural environments is critical to understand the emergence of resistant strains.
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Bibliography

References:

Li LG, Huang Q, Yin X, Zhang T (2020) Source tracking of antibiotic resistance genes in the environment – Challenges, progress, and prospects. Water Res 185: 116127.
Nurk S, Meleshko D, Korobeynikov A, Pevzner PA (2017) metaSPAdes: a new versatile metagenomic assembler. Genome Res 27: 824-834.
Papp M, Solymosi N (2022) Review and Comparison of Antimicrobial Resistance Gene Databases. Antibiotics 11: 339.
Schroeder CM, Zhao C, DebRoy C, Torcolini J, Zhao S, White DG, Wagner DD, McDermott PF, Walker RD, Meng J (2002) Antimicrobial resistance of Escherichia coli O157 isolated from humans, cattle, swine, and food. Appl Environ Microbiol 68: 576-581.
Subirats J, Sánchez-Melsió A, Borrego CM, Balcázar JL, Simonet P (2016) Metagenomic analysis reveals that bacteriophages are reservoirs of antibiotic resistance genes. Int J Antimicrob Agents 48: 163-167.
Summer EJ (2009) Preparation of a phage DNA fragment library for whole genome shotgun sequencing. In: Clokie MRJ, Kropinski AM (eds) Bacteriophages: methods and protocols, Volume 2 Molecular and applied aspects. Totowa, NJ: Humana Press, pp 27-46.
Tian R-M, Cai L, Zhang W-P, Cao H-L, Qian P-Y (2015) Rare events of intragenus and intraspecies horizontal transfer of the 16S rRNA gene. Genome Biol Evol 7: 2310-2320.
Zolfo M, Pinto F, Asnicar F, Manghi P, Tett A, Bushman F, Segata N (2019) Detecting contamination in viromes using ViromeQC. Nat Biotechnol 37: 1408-1412.
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Authors and Affiliations

J.J. López-Islas
1
ET. Méndez-Olvera
2
T. Reyes C
2
D. Martínez-Gómez
2

  1. Doctorado en Ciencias Agropecuarias, Autonomous Metropolitan University (UAM), Calzada del Hueso 1100, Villa Quietud, C.P. 04960, Coyoacán, México City, México
  2. Department of Agricultural and Animal Production, Autonomous Metropolitan University, campus Xochimilco (UAM-X), Calzada del Hueso 1100,Villa Quietud, C.P. 04960, Coyoacán, México City, México
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Abstract

Resistance of cyathostomins to benzimidazole (BZ) anthelmintics is widespread in horses in many parts of the world. This study compared three methods for the determination of benzimidazole resistance of Cyathostominae in 18 horses from a stud farm in Romania. The horses were treated with Fenbendazole. The resistance test was performed by FECRT, ERP and PCR. On Day 0, larvae of species belonging to the Cyathostominae subfamily, types A, B, C, D and Gyalocephalus, as well as Strongylus vulgaris species of the Strongylinae subfamily, were identified. At 42 days post treatment with fenbendazole only larvae of Cyathostominae, types A and D were identified. Resistance to Fenbendazole was found in one horse, using the FECRT and ERP tests. Both genetic resistance and susceptibility to BZ anthelmintics was observed in 13 samples (72.22%) using the PCR test. However, three samples (16.67%) showed only the BZ-susceptibility gene. In 2 samples, (11.11%) only the resistance gene to BZ anthelmintics was identified. Several inconsistencies in the evidence of resistance to benzimidazole were observed between the PCR test and the other two methods, which indicates that several methods for determining and controlling the resistance should be used in practice.
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Authors and Affiliations

G. Dărăbuş
1
C. Badea
1
I. Oprescu
1
S. Morariu
1
N. Mederle
1
M. Ilie
1
T. Suici
1
M. Imre
1

  1. Banat University of Agricultural Sciences and Veterinary Medicine of Timişoara, Faculty of Veterinary Medicine, 300645, Calea Aradului no. 119, Timişoara, Romania
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Abstract

Colistin is being used as a last-resort drug to treat infections caused by multidrug-resistant (MDR) bacteria in humans. In veterinary medicine, colistin has been used for the treatment and prevention of infectious diseases. In the first study of mcr genes by multiplex PCR in healthy pigs from Serbia, we discovered mcr-1 in 4.85% out of 350 fecal samples. The presence of mcr-1 gene was detected on three farms located less than 100 km apart from each other, predominantly in piglet samples. The results point to the necessity of monitoring of colistin resistance and the mcr genes in food producing animals as well as restricting colistin usage on farms.
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Authors and Affiliations

G. Kozoderović
1
V. Lalošević
2
T. Süli
3
V. Vračar
2

  1. University of Novi Sad, Faculty of Education in Sombor, Podgorička 4, 25000 Sombor, Republic of Serbia
  2. University of Novi Sad, Faculty of Agriculture, Department of Veterinary Medicine, Trg Dositeja Obradovića 8, 21000 Novi Sad, Republic of Serbia
  3. Veterinarski zavod Subotica, Beogradski put 123, 24000 Subotica, Serbia
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Abstract

Aluminum-glass partition systems are used as building facades but also as glazed internal walls designated to form various internal partitions with glass doors. These partitions are designated to create fire compartments as well as separate and soundproof the zones created, without visually limiting the built up area. System fireproof partitions manufactured in fire resistance classes EI 30 to EI 180 constitute an important product in the offer of domestic and foreign manufacturers in terms of fire safety. The internal and external fireproof partitions are generally designed conformant to deterministic criteria, i.e. the structure of the partition is determined by the formal requirements listed in the legal regulations pertaining to basic requirements which should be satisfied by buildings and their parts. The fireproofing qualities of system aluminum-glass partitions are controlled in laboratories and documented in technical approvals. Partitions designed according to the deterministic criteria may be verified by the fire reliability analysis of the designed structure using the known simple and complex models of the reliability theory. In this paper the reliability formulae for simple and mixed mathematical models of non-renewable objects, which have been applied to model the fire reliability of partitions made by Aluprof, a domestic maker of aluminum-glass systems, under catalog numbers MB-78EI and MB-118EI, have been juxtaposed. The results of calculations allowed for preparing design recommendations, verifying the deterministic criteria for design of fire resistant partitions. In particular the fire reliability analysis prompts for abandoning the design of expensive aluminum-glass partitions made of multi-layered glass having multiple fire resistant layers.
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Authors and Affiliations

Marian Gwóźdź
1
ORCID: ORCID

  1. University of Bielsko-Biala (ATH), Institute of Building Industry, ul. Willowa 2, 43-309 Bielsko-Biała, Poland
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Abstract

Vibrio species are common inhabitants of aquatic environments and have been described in connection with fish and human diseases.
Six Vibrio species were isolated from diseased freshwater and ornamental fish in Poland. The strains were identified based on morphological and biochemical characteristics and confirmed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) as V. albensis (n=3) from Gymnocephalus cernua, Sander lucioperca, Paracheirodon innesi, and Xiphophorus hellerii; V. mimicus (n=1) from Xiphophorus maculatus; and V. vulnificus (n=1) from Nematobrycon palmeri. This is the first time that Vibrio species have been isolated and described from ornamental fish in Poland. The isolates were resistant to ampicillin (83.3%), gentamicin (16.6%), ciprofloxacin (16.6%), sulfamethoxazole-trimethoprim (16.6%), and chloramphenicol (16.6%). The multiple antibiotic resistance (MAR) index was 0.00-0.08 for V. albensis, 0.17 for V. mimicus, and 0.33 for V. vulnificus.
Our study confirmed the presence of potentially pathogenic Vibrio species in freshwater and ornamental fish. Therefore, further monitoring of the presence of Vibrio species, mainly in ornamental fish, is necessary.
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Bibliography

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9. Cassini A, Högberg LD, Plachouras D, Quattrocchi A, Hoxha A, Simonsen GS, Colomb-Cotinat M, Kretzchmar ME, Devleesschauwer B, Cecchini M, Ouakrim DA, Oliveira TC, Struelens MJ, Suetens C, Monnet DL, Burden of AMR Collaborative Group (2019) At-tributable deaths and disability-adjusted life-years caused by infections with antibiotic-resistant bacteria in the EU and the European Eco-nomic Area in 2015: a population-level modelling analysis. Lancet Infect Dis 19: 5-66.
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Authors and Affiliations

A. Pastuszka
1
L. Guz
1
K. Michalak
2
D. Pietras-Ożga
2
K. Puk
1

  1. Department of Biology and Fish Diseases, Faculty of Veterinary Medicine, University of Life Sciences, Akademicka 12, 20-950 Lublin, Poland
  2. Department of Epizootiology and Clinic of Infectious Diseases, Faculty of Veterinary Medicine, University of Life Sciences, Głęboka 30, 20-612 Lublin, Poland
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Abstract

This article concerns “living zones of the imagination”—areas of social life in which intensive “interpretive labor” is underway. Thanks to these zones, it is possible to engage in universally accepted exercises that enable a person to “see the world through the eyes of another person” and that yet do not disturb the current socio-cultural order. They provide an important basis for understanding among people, for harmonizing meanings in the sphere of social realities, and for integration that goes beyond certain permanent boundaries and hierarchies. The basic aim of the article is to prove that hospitality, understood as a value in Polish culture, could contribute to a considerable degree to the creation of such zones. The author analyzes the zones’ character, function, and meaning, paying attention to how they resist the expansion of bureaucratic ways of organizing social life. He also draws attention to the influence that an axio-normative pattern could have within specific models of behavior and cultural practices. Key words: hospitality, resistance practices, social imagination, interpretive labor
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Authors and Affiliations

Adam Pisarek
1
ORCID: ORCID

  1. Uniwersytet Śląski w Katowicach
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Abstract

The aim of the work is to develop and test an algorithm of adjustment of geodetic observations, resistant to gross errors (method of robust estimations), with the use of the damping function, proposed by the author. Detailed formulae of the damping function as a component of the objective function in a modified classic least squares method were derived. The selection criteria for the controlling parameters of the damping functions have also been provided. The effectiveness of the algorithm has been verified with two numerical examples. The results have been analysed with reference to the methods of resistant compensation, which apply other damping functions, e.g. Hampel's function.
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Authors and Affiliations

Tadeusz Gargula
ORCID: ORCID
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Abstract

While the number of forced migrants moving out of conflict-ridden or otherwise troubled regions into rela-tively stable and safe parts of the world is higher than ever, the countries of destination are increasingly trying to prevent migrants from reaching their territories. Given the scale of forced displacement and current trends of tightening immigration policies, it should be expected that tragedies at the borders, similar to that recently witnessed in Europe, will become the norm rather than the exception and that new discourses and practices will continue to emerge, transforming territorial borders in various parts of the world into highly conflictual and politicised ‘borderspaces’. This article is a contribution to the understanding of borders through a case study of the recent policy of ‘closed doors’ that Poland has adopted towards Russia’s North Caucasus asylum seekers at the country’s eastern border with Belarus, preventing them from entering the territory and claiming protection. It demonstrates that, through the process of ‘bordering’, power is no longer exercised only by the border guards at the crossing point in Terespol from where asylum seekers are being returned and that it is increasingly to be found in social practices that occur on both sides of the border, away from the clearance points. The article examines the various practices of resistance undertaken by the asylum seekers and other actors on several different levels in response to the changed reality at the border. It also analyses the meanings and discourses developed by Polish state actors in order to legitimise restrictive migration policies.

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Authors and Affiliations

Marta Szczepanik
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Abstract

The process of social remitting is complex and multilayered, and involves numerous social actors that at each stage face several choices. By definition, the process of socially remitting ideas, codes of behav-iour and practices starts with the migrants themselves and their social context in the destination country. This paper focuses on the as yet unexplored issue of resistance performed and articulated by migrants confronted with potential change influenced by social remittances and the generalised process of diffu-sion. Faithful to the understanding of social remittances as ultimately a process where individual agency is the crucial determinant, the article follows the ideas, practices and values travelling across the trans-national social field between Britain and various localities in Poland. Resistance to change and new ways of doing things is a continuous dialogical process within one culture’s power field, which is un-derstood here in anthropological terms as a porous, open-ended field of competing meanings and dis-courses. Notions of bifocality, infra-politics of power relations and resistance are an important aspect of remittances and their reinterpretations, and resistance to social remittances by migrants, both in their destinations and in their communities of origin, is a crucial component of the whole process without which our understanding of remittances is incomplete.

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Authors and Affiliations

Michał P. Garapich
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Abstract

The paper presents the results of simulation tests of hydraulic resistance and temperature distribution of the prototype Stirling alpha engine supplied with waste heat. The following elements were analyzed: heater, regenerator and cooler. The engine uses compressed air as a working gas. Analyses were carried out for three working pressure values and different engine speeds. The work was carried out in order to optimize the configuration of the engine due to the minimization of hydraulic resistance, while maintaining the required thermal capacity of the device. Preliminary tests carried out on the real object allowed to determine boundary and initial conditions for simulation purposes. The simulation assumes that there is no heat exchange between the regenerator and the environment. The solid model used in simulation tests includes the following elements: supply channel, heater, regenerator, cooler, discharge channel. Due to the symmetrical structure of the analyzed elements, simulation tests were carried out using 1/6 of the volume of the system.

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Authors and Affiliations

Mariusz Furmanek
Jacek Kropiwnicki
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Abstract

Antibiotics are used for postsurgical wound healing purposes but unfortunately, resistance against them demands some alternatives for quick recovery. Sepsis of wounds is a challenge for medical as well as veterinary professionals. Nanoparticles have significant advantages in wound treatment and drug resistance reversal. This study was conducted to appreciate emerging alternates of antibiotics like zinc oxide nanoparticles and plant extracts in topical application. Zinc oxide is considered a good wound healer and its nanoparticles are easy to access. So, the efficacies of zinc oxide nanoparticles and sweet flag plant extract ointments were tested to compare modern and traditional therapeutics as sweet flag is considered a pure medicinal plant. Rabbits were selected for this study due to the healing properties of their skin. Wounds were inflicted on the thoracolumbar region and treated for 29 days post-surgically daily with normal saline and the ointment of zinc oxide nanoparticles and sweet flag extract ointment, prepared in a hydrophilic solvent. Wound shrinkage was observed daily and histopathological analysis was made and results were compared. Zinc oxide nanoparticles ointment showed the most satisfactory results for every parameter included in the study. No side effects of its topical application were observed. Healing was normal without any complications. The preparations of zinc oxide nanoparticles may help in the era of antibiotic resistance as topical drugs in the future.
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Authors and Affiliations

A. Abbas
1 2
S.A. Muhammad
3
A. Ashar
4
S.A. Mehfooz
2
A. Rauf
3
M. Bakhsh
3
T. Nadeem
5
H. Fu
1

  1. Department of Pharmacy, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
  2. Department of Clinical Medicine and Surgery, University of Agriculture, Faisalabad 38000, Pakistan
  3. University of Veterinary and Animal Sciences, Lahore, CVAS Jhang 35200, Pakistan
  4. Wilson College of Textiles, North Carolina State University, North Carolina, USA
  5. University of Veterinary and Animal Sciences, Lahore, Para Veterinary Institute (PVI), Karor 31100, Layyah, Pakistan
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Abstract

Iron aluminides are iron-aluminum alloys that have excellent resistance to oxidation at high temperatures with low density, high resistance/weight ratio and a low manufacturing cost. Due to its characteristics, these alloys are presented as an option to replace stainless steels in certain applications. This works intends report the casting process and subsequent analyses involving microstructure, mechanical properties, and corrosion resistance of two Fe-Al-C alloys (Fe-11wt%Al and Fe-25wt%Al, containing 0.31-0.37%C), which were prepared in an induction furnace and poured in a permanent mold. Samples of these alloys were characterized and presented elevated hardness values of 37 HRC (alloy Fe-11wt%Al) and 49.6HRC (alloy Fe-25wt%Al) and microstructure with aluminides type Fe3Al and FeAl and also carbides type K. The Fe-11wt%Al alloy exhibited superior resistance to uniform corrosion, although both Fe-Al-C alloys exhibited significantly higher corrosion rates compared to a binary iron aluminide in 0.5M H2SO4 containing naturally dissolved oxygen.
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Bibliography

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Authors and Affiliations

A.P. Silva
1
ORCID: ORCID
P.P. Brito
1
N. Martins
1

  1. PUC Minas, Brazil
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Abstract

Experimental methods are presented for determining the thermal resistance of vertical-cavity surfaceemitting lasers (VCSELs) and the lateral electrical conductivity of their p-type semiconductor layers. A VCSEL structure was manufactured from III-As compounds on a gallium arsenide substrate. Conductivity was determined using transmission line measurement (TLM). Electrical and thermal parameters were determined for various ambient temperatures. The results could be used for computer analysis of VCSELs. Keywords: TLM, thermal resistance, VCSEL, AlGaAs.
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Authors and Affiliations

Patrycja Śpiewak
1
ORCID: ORCID
Marcin Gębski
1
ORCID: ORCID
Włodek Strupiński
2 3
Tomasz Czyszanowski
1
Walery Kołkowski
2
Iwona Pasternak
2 3
Robert P. Sarzała
1
ORCID: ORCID
Włodzimierz Nakwaski
1
Włodzimierz Wasiak
1

  1. Photonics Group, Institute of Physics, Lodz University of Technology, ul. Wólczanska 219, 90-924 Łódz, Poland
  2. Vigo Photonics S.A., ul. Poznanska 129/133, 05-850 Ozarów Mazowiecki, Poland
  3. Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
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Abstract

Electrical properties of semiconductor materials depend on their defect structure. Point defects, impurities or admixture contained in a semiconductor material, strongly affect its properties and determine the performance parameters of devices made on its basis. The results of the currently used methods of examining the defect structure of semiconductor material are imprecise due to solution of ill-posed equations. These methods do not allow for determination of concentration of the defect centers examined. Improving the resolution of the obtained parameters of defect centers, determining their concentration and studying changes in the resistivity of semi-insulating materials can be carried out, among others, by modelling changes in the concentration of carriers in the conduction and valence bands. This method allows to determine how charge compensation in the material affects the changes in its resistivity. Calculations based on the Fermi-Dirac statistics can complement the experiment and serve as a prediction tool for identifying and characterizing defect centers. Using the material models (GaP, 4H–SiC) presented in the article, it is possible to calculate their resistivity for various concentrations of defect centers in the temperature range assumed by the experimenter. The models of semi-insulating materials presented in the article were built on the basis of results of testing parameters of defect centers with high-resolution photoinduced transient spectroscopy (HRPITS). The current research will allow the use of modelling to determine optimal parameters of semi-insulating semiconductor materials for use in photoconductive semiconductor switches (PCSS).
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Authors and Affiliations

Marek Suproniuk
1

  1. Military University of Technology, Faculty of Electronics, Institute of Electronic Systems, gen. S. Kaliskiego 2, Warsaw
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Abstract

Otitis externa is a canine disease of multifactorial etiology in which bacteria plays a significant role. Due to the predominant bacterial etiology otitis is usually treated with antibiotics. However, non-prudent use of antibiotics promotes the emergence of antibiotic-resistant bacteria thus compromising the therapy effectiveness. Currently, the increase of antimicrobial resistance (AMR) is one of the biggest threats to global health. For this reason, the aim of the study was to investigate prevalence of the microbiological causes of canine otitis externa and the antibiotic susceptibility of the isolated bacterial strains. The research and sampling were conducted at Veterinary Clinics for small pets in Serbia. Samples were sent to laboratory for bacteriological and mycological testing. Additionally, the sensitivity of the isolated bacteria to antibiotics was evaluated using disc diffusion method. Sixty dogs with otitis externa clinical symptoms were included in the study. Out of a total of 53 positive samples for pathogen presence, bacteria were present in 40. The most prevalent bacteria was Staphylococcus pseudintermedius, followed by Pseudomonas aeruginosa and Proteus spp., while Malassezia pachydermatis was the only isolated yeast pathogen occurring in 36 samples. Generally, the lowest resistance against all bacteria showed enrofloxacin. On the contrary, high resistance to penicillin and amoxicillin was a common finding for G+ and G- bacteria. These results indicate the need for laboratory testing in terms of isolation, identification and antibiotic susceptibility testing, not only in the case of otitis externa in dogs, but in all diseases when it is possible, in order to enhance antimicrobial stewardship and consequently to contribute AMR reduction.
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Authors and Affiliations

N. Tesin
1
D. Stojanovic
1
I. Stancic
1
N. Kladar
2 3
Z. Ružić
1
J. Spasojevic
1
D. Tomanic
1
Z. Kovacevic
1

  1. Department of Veterinary Medicine, Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, 21000 Novi Sad, Serbia
  2. Center for Medical and Pharmaceutical Investigations and Quality Control, Faculty of Medicine, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
  3. Department of Pharmacy, Faculty of Medicine, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
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Abstract

Hydraulic and transport properties of periodic open cellular structures (POCS) based on cubic cells were investigated numerically. Different cell and strut dimensions, as well as strut shapes, were examined. Numerical results of heat transfer and flow resistance, as well as modeled morphological parameters were verified experimentally. The most beneficial properties were obtained for the POCS with convex triangular, circular and hexagonal struts.
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Authors and Affiliations

Marzena Iwaniszyn
1
ORCID: ORCID

  1. Polish Academy of Sciences, Institute of Chemical Engineering, Bałtycka 5, 44-100 Gliwice, Poland

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