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Tytuł:
Evaluation of fungal diversity and mycotoxin content in pig feed containing clusterbean (Cyamopsis tetragonoloba) meal
Autorzy:
Karpiesiuk, K.
Polak-Śliwińska, M.
Dąbrowska, J.A.
Pszczółkowska, A.
Kozera, W.
Czarnik, U.
Okorski, A.
Powiązania:
https://bibliotekanauki.pl/articles/53641079.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
The safety and quality of animal feed are often unknown concerning the content of fungi and mycotoxins. Animal feed may be infested with fungi, leading to contamination with mycotoxins, which pose a potential risk to human and animal health. Currently, the feeding of pigs is mainly based on cereals and soy as protein components. In order to reduce the cost of feed production, other protein sources are used in addition to soy. To assess the health of pig feeds containing guar meal in their composition, a study was conducted to evaluate the presence of toxigenic fungi (culture and qPCR method) and mycotoxins (HPLC). Eight complete feeds produced on the farm containing locally produced feed materials including soybean meal and guar meal as protein components were investigated. The results of the mycobiome analysis showed that the tested feed mixtures were characterised by a high diversity of fungi, with saprophytic species clearly dominating. The qPCR analysis confirmed the presence of Fusarium and P. verrucosum fungi in the mixtures. Chemical tests of mycotoxin content confirmed the presence of Fusarium mycotoxins: DON, 3-AcDON, ZEA, T2 and OTA. Barley grain and guar meal were responsible for the contamination of the feed with the toxins DON, 3-AcDON, ZEA and OTA, while in the case of the T2 toxins, wheat grain and to a lesser extent the premix were responsible. The above correlations were confirmed by a correlation analysis that took into account the different levels of the feed components. Overall, it should be emphasised that the feeds were contaminated with mycotoxins to a low degree, which confirms their high quality. The storage conditions favoured the development of saprotrophic mycoflora and prevented the development of toxigenic species.
Źródło:
Journal of Elementology; 2023, 28, 4; 1203-1220
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finding Playing Styles of Badminton Players Using Firefly Algorithm Based Clustering Algorithms
Autorzy:
Ilankoon, I.M.T.P.K.
Samarasinghe, U.S.
Ariyaratne, M.K.A.
Silva, R. M.
Powiązania:
https://bibliotekanauki.pl/articles/27312858.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
firefly algorithm
clustering
intra- and inter-cluster distance
badminton
Opis:
Cluster analysis can be defined as applying clustering algorithms with the goalof finding any hidden patterns or groupings in a data set. Different clusteringmethods may provide different solutions for the same data set. Traditionalclustering algorithms are popular, but handling big data sets is beyond theabilities of such methods. We propose three big data clustering methods basedon the firefly algorithm (FA). Three different fitness functions were definedon FA using inter-cluster distance, intra-cluster distance, silhouette value, andthe Calinski-Harabasz index. The algorithms find the most appropriate clustercenters for a given data set. The algorithms were tested with nine popularsynthetic data sets and one medical data set and are later applied on two bad-minton data sets with the intention of identifying the different playing stylesof players based on their physical characteristics. The results specify that thefirefly algorithm could generate better clustering results with high accuracy.The algorithms cluster the players to find the most suitable playing strategyfor a given player where expert knowledge is needed in labeling the clusters.Comparisons with a PSO-based clustering algorithm (APSO) and traditional al-gorithms point out that the proposed firefly variants work in a similar fashion asthe APSO method, and they surpass the performance of traditional algorithms.
Źródło:
Computer Science; 2023, 24 (3); 427--450
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incidence and molecular characterization of extended-spectrum beta-lactamase (ESBL)-producing Salmonella enterica and Escherichia coli of avifauna origin in Pakistan
Autorzy:
Saeed, M.A.
Waheed, U.
Ehtisham-ul-Haque, S.
Khan, A.U.
Kashif, M.
Qamar, M.F.
Ghafoor, A.
Saqlain, M.
Asghar, J.
Powiązania:
https://bibliotekanauki.pl/articles/16647457.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
ESBL
genotypic characterization
Salmonella enterica
Escherichia coli
avifauna
Pakistan
Opis:
Members of Enterobacteriaceae are known to produce extended-spectrum beta-lactamases (ESBL) which hydrolyze the beta-lactam group of antibiotics. The existence of ESBL-producing Salmonella enterica (S. enterica) and Escherichia coli (E. coli) harbored by urban avifauna was investigated in this study. Dropping samples (n= 180) were collected from six different bird species in the district Jhang, Punjab province, Pakistan. Isolation and identification of ESBL isolates were made by using cefotaxime- (4 mg/L) supplemented MacConkey agar and double disc synergy test (DDST). Polymerase chain reaction (PCR) was performed for the detection of four different ESBL genes including bla CTX-M, bla TEM, bla SHV and bla OXA. A total of 42.69% isolates were confirmed as ESBL via DDST including 30.64% S. enterica and 49.54% E. coli. The incidence of ESBL S. enterica and ESBL E. coli was found highest in egret (Ardea alba) and pigeon (Columba livia) as 64.28% and 78.95%, respectively. The bla CTX-M gene was detected in 57.89% and 64.81% of isolates of S. enterica and E. coli, respectively. Among other genes in S. enterica and E. coli, bla TEM (21.05%, 20.4%); bla SHV (15.78%, 9.26%), and bla OXA (5.26%, 5.56%) were detected, respectively. All of the tested isolates were found resistant to at least one of the thirteen antimicrobial agents except meropenem. To the best of our knowledge, this is the first study reporting the incidence and genetic diversity of ESBL bacteria associated with urban avifauna in Pakistan. The urban avifauna can serve as a potential subject of bio-surveillance to monitor the emergence of antimicrobial-resistant bacteria.
Źródło:
Polish Journal of Veterinary Sciences; 2023, 26, 1; 47-55
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutritional and antioxidant profile of the Physalis fruit grown in three Andean regions of Peru
Autorzy:
Obregón-La Rosa, A.J.
Contreras-López, E.
Juárez, E.F.
Barrón, U.G.
Muñoz, A.M.
Ramos-Escudero, F.
Powiązania:
https://bibliotekanauki.pl/articles/28765541.pdf
Data publikacji:
2023
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Opis:
Background. Physalis peruviana L. fruit contains nutritional and bioactive compounds of immense importance to public health and represents a potential ingredient for the development of functional foods and beverages. Objective. This study aimed to determine the chemical and nutritional composition as well as the antioxidant capacity of the P. peruviana L. fruit grown in Peru in three areas of the Central Andean region. Material and methods. Proximal and physicochemical analyses and estimation of mineral content, vitamin C, total carotenoids, total polyphenols, and antioxidant capacity (2, 2-diphenyl-1-picrylhydrazyl [DPPH] and 2, 2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) [ABTS] assays) were performed using standardized methods. Results. The fruits were collected from three regions of the Peruvian Andes (Ancash, Cajamarca, and Cusco). The results showed that the content of potassium (306.54–327.60 mg/100 g) and iron (12.93–14.47 mg/kg) was prominent. The Physalis fruit had high levels of vitamin C (47.20–52.20 mg/100 g), total polyphenols (68.17–83.40 mg equivalents of gallic acid/100 g), and carotenoids (1.12–1.73 mg β-carotene/100 g). Higher values for antioxidant capacity were obtained with the ABTS method (896–1003.33 μmol Trolox/100 g) than with the DPPH method (290–309 μmol Trolox/100 g). Conclusions. This study confirms that the P. peruviana fruit has properties that could provide important health benefits and that it could be used for the development of functional foods and food supplement.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2023, 74, 1; 49-57
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pollen morphology of Polygala L. (Polygalaceae) from Turkey and its taxonomic implications
Autorzy:
Donmez, E.O.
Aydin, Z.U.
Donmez, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/31341324.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2023, 65, 2; 21-47
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Provisional assessment of forage quality in common vetch using near-infrared reflectance spectroscopy
Autorzy:
Oluk, C.A.
İnal, İ.
Serbester, U.
Powiązania:
https://bibliotekanauki.pl/articles/53852538.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Techniques involving wet chemistry are time- and money-consuming, and the waste they generate is harmful to the environment. The near infrared technology not only makes it feasible to quickly examine various parameters, but also to determine all of these parameters at once. For the purpose of identifying the forage quality components of crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF), dry matter (DM), and ash, a calibration of Near Infrared Reflectance (NIR) spectroscopy was obtained. In this study, it was aimed to develop a common vetch specific near infrared (NIR) spectroscopy calibration by using 197 samples consisting of different common vetch lines and varieties. For the calibration of DM, CP, ADF, and NDF, second derivative pretreatment was utilized; for ash, first derivative pretreatment was used. The coefficients of determination (R2) in the calibration set were 0.977 for DM, 0.856 for ash, 0.823 for CP, 0.754 for ADF and 0.630 for NDF. The validations performed over the DM, ash, CP, NDF and ADF parameters of mean values and the coefficient of determination in the external validation (r2) were 92.44,0.974; 1.953, 0.822; 17.04, 0.784; 42.24, 0.659; 30.56, 0.644, respectively. The equtaions for DM (RPDv = 6.247) showed high accuracy, while the equations for ash (RPDv = 2.367), CP (RPDv = 2.146), NDF (RPDv = 2.037) and ADF (RPDv = 2.010) showed relatively high accuracy. The dry matter equations were suitable for quantitative prediction of common vetch quality, according to the relative predictive determinant ratios (RPDv) for calibration, whilst the CP, ADF, NDF, and ash equations were helpful for screening. It was determined that NIR spectroscopy may be used to successfully predict CP, ADF, DM, and ash in samples of common vetch.
Źródło:
Journal of Elementology; 2023, 28, 2; 337-348
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola monocytów w odporności
Role of monocytes in immunity
Autorzy:
Gliński, Z.
Żmuda, A.
Lisiecka, U.
Powiązania:
https://bibliotekanauki.pl/articles/28763111.pdf
Data publikacji:
2023
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Tematy:
odpornosc
odpornosc wrodzona
odpornosc nabyta
monocyty
makrofagi
komorki dendrytyczne
funkcje
Źródło:
Życie Weterynaryjne; 2023, 98, 08; 494-498
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seed germination dynamics of some woody legumes: implication for restoration of arid zones ecosystems
Autorzy:
Buba, T.
Ezra, A.G.
Bako, S.P.
Sabo, M.U.
Powiązania:
https://bibliotekanauki.pl/articles/28825291.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2023, 104, 4; 381-402
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Travelling wave solutions of the non-linear wave equations
Autorzy:
Haider, Jamil A.
Rahman, Jamshaid U.
Zaman, Fiazud D.
Gul, Sana
Powiązania:
https://bibliotekanauki.pl/articles/2204690.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
nonlinear evolution problems
coupled equations
Jacobi elliptic functions
periodic solutions
Opis:
This article focuses on the exact periodic solutions of nonlinear wave equations using the well-known Jacobi elliptic function expansion method. This method is more general than the hyperbolic tangent function expansion method. The periodic solutions are found using this method which contains both solitary wave and shock wave solutions. In this paper, the new results are computed using the closed-form solution including solitary or shock wave solutions which are obtained using Jacobi elliptic function method. The corresponding solitary or shock wave solutions are compared with the actual results. The results are visualised and the periodic behaviour of the solution is described in detail. The shock waves are found to break with time, whereas, solitary waves are found to be improved continuously with time.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 2; 239--245
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the economic efficiency of industrial enterprise management during the Kazakhstan integration into the EAEU
Ocena efektywności ekonomicznej zarządzania przedsiębiorstwem przemysłowym w czasie integracji Kazachstanu z EUG
Autorzy:
Nurekenova, Elvira S.
Sholpanbayeva, Kanshaim Zh.
Apysheva, Assel A.
Rakhimberdinova, Madina U.
Shaikhanova, Nurgul K.
Powiązania:
https://bibliotekanauki.pl/articles/27315256.pdf
Data publikacji:
2022
Wydawca:
Politechnika Częstochowska
Tematy:
crisis
structure
formalisation
integration
efficiency
kryzys
struktura
formalizacja
integracja
efektywność
Opis:
The purpose of this study is to examine the effectiveness of the measures taken and to identify areas for further integration cooperation. The originality of the study is determined by the fact that the formalisation of Kazakhstan integration into the Eurasian Economic Union (EAEU) structures allows expanding the possibilities of building cooperative ties. This requires greater involvement of enterprises in the integration and the development of a unified state system to assess the effectiveness of integration associations. The authors show that, in general, the integration of Kazakhstan and the EAEU can be assessed based on a common methodology for the economic efficiency of individual enterprises. The authors suggest the adapted methodology of the balanced scorecard system since it is appropriate in this case. The practical significance of the study is determined by the need to clarify the structural features of integration and calculate efficiency in general based on the results of the cooperation of Kazakh enterprises with external partners. The development of such an assessment system can also be implemented taking into account the need to counter the global economic crisis.
Celem niniejszego opracowania jest zbadanie skuteczności podejmowanych działań oraz zidentyfikowanie obszarów dalszej współpracy integracyjnej. O oryginalności opracowania decyduje fakt, że sformalizowanie integracji Kazachstanu ze strukturami Eurazjatyckiej Unii Gospodarczej (EUG) pozwala na rozszerzenie możliwości budowania powiązań kooperacyjnych. Wymaga to większego zaangażowania przedsiębiorstw w integrację i budowy jednolitego systemu państwowego do oceny efektywności stowarzyszeń integracyjnych. Autorzy pokazują, że generalnie integrację Kazachstanu i EUG można oceniać w oparciu o wspólną metodologię efektywności ekonomicznej poszczególnych przedsiębiorstw. Autorzy proponują zaadaptowaną metodologię systemu zrównoważonej karty wyników, ponieważ jest ona w tym przypadku odpowiednia. Praktyczne znaczenie badania przesądza o potrzebie doprecyzowania cech strukturalnych integracji i obliczenia efektywności w ogóle na podstawie wyników współpracy kazachskich przedsiębiorstw z partnerami zewnętrznymi. Opracowanie takiego systemu oceny może być również realizowane z uwzględnieniem konieczności przeciwdziałania światowemu kryzysowi gospodarczemu.
Źródło:
Polish Journal of Management Studies; 2022, 26, 1; 233--249
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Buffer Effects in Submersed Denitrifying Biofilter
Autorzy:
Gevod, V. S.
Chernova, A. S.
Zhumadulayeva, A. I.
Dossybayeva, G. N.
Syzdykova, M.
Shymelkova, R. Zh.
Issayeva, A. U.
Powiązania:
https://bibliotekanauki.pl/articles/2086392.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
biofiltration
denitrification
microflora activity
self-regulation
system stability
Opis:
The high content of nitrates in drinking water leads to serious diseases. The creation of biofiltering devices with the longest time of their operation between preventive flushes is extremely important. The purpose of this study was to investigate the features of the functioning of the developed U-shaped submersible denitrifying biofilter during its long-term operation in the piston filtration mode. The denitrification of water by using the method of displacement (piston) biofiltration in a submersible small U-shaped biofilter with immovable carriers of attached microflora in its filter load was studied. As a result, clogging of the pore space of the biofilter in the zone of excess bacterial nutrition is prevented and the vital activity of bacteria is maintained in places where there is no nutrient substrate. It has been shown that, due to adaptive mechanisms, denitrifying bacteria convert nitrate ions into gaseous nitrogen, consuming extracellular polymeric substances. The rate constants of the reaction of reduction of nitrates to molecular nitrogen in different zones of the biofilter under different filtration modes were determined. The activity of the microflora inside the biofilter quickly returns to its original level when a full-fledged external nutrition is resumed. The efficiency of nitrate to nitrogen conversion in the studied biofilter is 94.2±8.9%.
Źródło:
Journal of Ecological Engineering; 2022, 23, 4; 145--154
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In-situ metal matrix composites development for additive manufacturing: a perspective
Autorzy:
Essien, U. A.
Vaudreuil, S.
Powiązania:
https://bibliotekanauki.pl/articles/2172157.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
metal matrix composites
in-situ reinforcement
AM materials
additive manufacturing
SLM
direct printing
kompozyt z osnową metaliczną
MMC
zbrojenie in-situ
wytwarzanie przyrostowe
AM
materiały
laserowe przetapianie proszków
druk bezpośredni
Opis:
Purpose This paper presents an overview on some ceramic materials capable of achieving in-situ reinforcements in Al/Al-alloy metal matrix composites (MMCs) during laser processing. It also presents perspective on further exploitation of the in-situ reinforcement capabilities for high quality MMCs feedstock material development. Design/methodology/approach The approach utilized in writing this paper encompasses the review of relevant literature on additive manufacturing (AM) of MMCs. Findings It is widely accepted that the in-situ reinforcement approach has proven to be more advantageous than the ex-situ approach. Though there are still some challenges like the formation of detremental phases and the evaporation of low melting temperature elements, the in-situ reinforcement approach can be used to tailor design composite powder feedstock materials for the AM of MMCs. The preprocessing or tailor-designing in-situ metal matrix composite powder before laser melting into desired components holds more promises for metal additive manufacturing. Practical implications The need for the development of MMCs powder feedstock that can be directly fabricated using suitable AM technique without prior powder processing like blending or mechanical alloying has not yet been addressed Therefore, having a pre-processed in-situ reinforced MMC feedstock powder can encourage easy fabrication of MMC and other advantages of AM technologies powder recycling. Originality/value The idea explained in this article is relevant to materials development for AM processing of metal matrix composite. This paper has pointed out future trends for MMCs materials feedstock powder development and new ideas for further exploitation of MMCs and AM technologies. The advantages of tailor-designing composite powders other than merely mixing them has been emphasized.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 111, 2; 78--85
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intake of selected food groups in relation to risk of breast cancer
Autorzy:
Oleksiak, A.
Deptała, A.
Dąbrowska-Bender, M.
Religioni, U.
Badowska-Kozakiewicz, A.M.
Powiązania:
https://bibliotekanauki.pl/articles/28761770.pdf
Data publikacji:
2022
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2022, 29, 3; 342-347
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular epidemiology and phylogenetic analysis of Tams I gene of Theileria annulata in Khyber Pakhtunkhwa, Pakistan
Autorzy:
Shah, S.S.A.
Saddique, U.
Khan, M.A.
Khan, S.
Powiązania:
https://bibliotekanauki.pl/articles/16647390.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
crossbred cattle
Pakistan
PCR
risk factors
sequencing
theileriosis
Opis:
Theileriosis is a hemoparasitic disease that affects a wide range of different animal species and is caused by various species of Theileria. This study aimed to determine the molecular epidemiology of Theileria annulata through microscopy and PCR, in crossbred cattle in some districts of Khyber Pakhtunkhwa, Pakistan. For this study, a total of 384 blood samples were collected from cattle in the Peshawar (n=120), Charsadda (n=94), Nowshera (n=84), and Swabi (n=86) districts. Microscopy and PCR were used to determine the overall prevalence of theileriosis, which was found to be 15.8 and 22.6%, respectively. Theileria annulata was detected in blood samples through PCR in the study area, and the target gene i.e., Tams 1, of positive samples was sequenced. The sequences in the current study revealed high sequence homology (ranging from 96 to 100%) with Tams 1 sequences of neighboring countries present in the NCBI database. Season, breed, age, and sex were found to be important risk factors among the several risk factors examined, whereas, among different clinical manifestations, lymphadenopathy showed a strong association with theileriosis. According to Cohen’s kappa and ROC analysis, microscopy was proven to be a fair diagnostic test for detecting theileriosis in cattle, and may be used in combination with molecular techniques for screening a large number of animals.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 4; 625-629
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normalization of the AIS (Acceptance of Illness Scale) questionnaire and the possibility of its use among cancer patients
Autorzy:
Czerw, A.
Religioni, U.
Szumilas, P.
Sygit, K.
Partyka, O.
Mękal, D.
Jopek, S.
Mikos, M.
Strzępek, L.
Powiązania:
https://bibliotekanauki.pl/articles/28761834.pdf
Data publikacji:
2022
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2022, 29, 2; 269-273
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł

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