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    Wyświetlanie 1-12 z 12
    Tytuł:
    Toxicity and combined action of some insecticides and clove oil against Rhyzopertha dominica in wheat grain
    Autorzy:
    Hamza, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/65102.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lesser grain borer
    Rhyzopertha dominica
    Coleoptera
    Bostrychidae
    plant pest
    wheat
    grain
    toxicity
    combined action
    insecticide
    clove oil
    clove
    Syzygium aromaticum
    alpha-cypermethrin
    lambda-cyhalothrin
    malathion
    Opis:
    Concerns about food quality and environmental protection have led to the search for effective and safe insect control measures. This study was carried out to evaluate the efficacy of some insecticides (malathion, alpha-cypermethrin, lambda-cyhalothrin) and clove oil, alone and in combinations, to protect wheat grain against Rhyzopertha dominica. Adult mortality, progeny emergence and weight loss of treated grain were examined. The results revealed that the tested insecticides and clove oil alone showed high efficiency to R. dominica with respect to mortality, progeny of the adults and weight loss of wheat grain. The mixing of lambda-cyhalothrin and clove oil with the most effective insecticide (alphacypermethrin) enhanced its efficacy to R. dominica. It was more efficient against R. dominica than when used alone with respect to mortality and progeny of the adults. However, mixing alpha-cypermethrin with malathion reduced the efficacy of alpha-cypermethrin against R. dominica with respect to mortality and progeny of the adults. Combinations of alpha-cypermethrin and clove oil reduced wheat grain loss more than using them alone. Mixing lambda-cyhalothrin and clove oil with low concentrations of alpha-cypermethrin improved its efficacy against R. dominica and therefore may reduce environmental pollution, lower risks to human health, and delay insect resistance development.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of NI-TIO2 and NI-TIO2-graphene coatings and heat treatment hardening on solid particles erosion resistance of grade 410 stainless steel
    Autorzy:
    Khalid, Wissam
    Al-Tameemi, Hamza A.
    Powiązania:
    https://bibliotekanauki.pl/articles/38912091.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    solid particles erosion
    wear rate
    wear resistance
    erosion testers
    AISI 410 stainless steel
    Ni-TiO2 coating
    Ni-TiO2-graphene coating
    Opis:
    Erosion by solid particles is a serious problem in many applications, especially in rotary machines with steel blades. Many coatings are currently being developed to improve erosion resistance. This study focuses on investigating the solid particles erosion (SPE) resistance of AISI 410 stainless steel and improving the SPE resistance using three different anti-wear techniques: hard coating (Ni-TiO2), hard coating with low shear resistance (Ni-TiO2-graphene) and hardening by heat treatment. The study also investigates the effect of different factors, including impact angle, jet pressure (particle speed) and solid particle type on each of the four types of specimens. The investigated anti-wear techniques improved the erosion wear rate by different percentages, such as 35.2% using Ni-TiO2 coating, 36% using Ni-TiO2-graphene, and 53.75% using heat-treatment when silica sand, a 45◦ impact angle and a speed of 36.72 m/s were used. The results indicate a ductile erosion mechanism as the weight loss decreases with an increase in the impact angle. The investigated coatings were found to provide more stable erosion resistance under different impact angles. Surface roughness was reduced after SPE for coated surfaces, and surfaces showing a lower wear rate may not necessarily show less change in surface roughness. It was observed that deformation in the form of waviness only occurs when the surface is impacted by small rounded particles at a 45◦ angle. Wear rate parameters were calculated, which can be used to estimate the wear rate for the investigated material under various conditions.
    Źródło:
    Engineering Transactions; 2023, 71, 4; 571-593
    0867-888X
    Pojawia się w:
    Engineering Transactions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unconventional alternatives for control of tomato root rot caused by Rhizoctonia solani under greenhouse conditions
    Autorzy:
    Hamza, A.
    Mohamed, A.
    Derbalah, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/66331.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biological agent
    control
    tomato
    root rot
    Rhizoctonia solani
    greenhouse condition
    plant oil
    nanoparticle
    Opis:
    This study was done to assess the antifungal effect of some biocontrol agents effective microorganisms (EMs1), Pseudomonas fluorescences, and Bacillus pumilus, titanium dioxide (TiO2) nanoparticles, black cumin and wheat germ oils as well as the recommended fungicide (flutolanil) against root rot of tomato. Moreover, gas chromatography-mass spectrometry (GC-MS) examination was completed to identify the bioactive compounds in plant oils (dark cumin and wheat germ). Also the impact of these medicines on some biochemical and growth parameters of tomato was examined. Flutolanil was the best treatment followed by dark cumin, TiO2, EMs1, Pseudomonas fluorescens, Bacillus pumilus and wheat germ oil, individually in both test seasons. The outcomes demonstrated a marked increase in each biochemical character (chlorophyll substance, peroxidase and polyphenoloxidase) and plant development (height and fresh and dry weight) under all the tried treatments in comparison to the controls.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fenton reagent and titanium dioxide nanoparticles as antifungal agents to control leaf spot of sugar beet under field conditions
    Autorzy:
    Hamza, A.
    El-Mogazy, S.
    Derbalah, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/65947.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fenton's reagent
    titanium dioxide
    nanoparticle
    antifungal agent
    disease control
    leaf spot
    sugar-beet
    field condition
    toxicity
    Opis:
    In this study, foliar sprays of Fenton solutions (Fenton reaction, Fenton-like reaction and Fenton complex), titanium dioxide (TiO2) and the recommended fungicide (chlorothalonil) were estimated in the control of sugar beet leaf spot caused by Cercospora beticola under field conditions in two growing seasons. In addition, the impacts of these treatments on some crop characters (leaf dry weight, root fresh weight, soluble solid content, sucrose content and purity of sugar) were examined. Biochemical and histological changes in the livers and kidneys of treated rats compared to an untreated control were utilized to assess the toxicity of the examined curative agents. Overall, chlorothalonil and Fenton complex were the most effective treatments for disease suppression in both tested seasons followed by Fenton-like reagent, Fenton’s reagent and TiO2, respectively. Growth and yield characters of treated sugar beet significantly increased in comparison to an untreated control. There were mild or no (biochemical and histological) changes in the livers and kidneys of treated rats compared to the control. Fenton solutions and TiO2 may offer a new alternative for leaf spot control in sugar beet.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Echinochloa colonum resistance to bispyribac-soduim in Egypt - occurrence and identification
    Autorzy:
    El-Nady, M.F.
    Hamza, A.M.
    Derbalah, A.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/65646.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Identification and mechanism of Echinochloa colonum (L.) resistance to bispyribac-soduim via physiological and anatomical differences between susceptible and resistant biotypes was investigated. The physiological and anatomical differences that were take into account were growth reduction, chlorophyll content reduction, protein analysis, lamina thickness and xylem vessel diameter in both susceptible and resistant biotypes of E. colonum. The results showed the growth reduction fifty (GR50) of resistant biotype was 10.2 times higher than that of the susceptible biotype E. colonum treated with bispyribac-soduim. The chlorophyll content was highly reduced in the susceptible biotype relative to the resistant one of E. colonum treated with bispyribac-soduim. An anatomical test showed significant differences in the cytology of susceptible and resistant biotypes of E. colonum treated with bispyribac-soduim with respect to lamina thickness and xylem vessel diameter. Furthermore, leaf protein analysis showed significant differences between the susceptible and resistant biotypes of E. colonum in the number and the density of protein bands. The resistance of E. colonum to bispyribac-soduim may be due to the faster metabolism of bispyribac-soduim below the physiologically active concentration or the insensitivity of its target enzyme, (acetolactate synthase). These results implied the occurrence of E. colonum resistance to bispyribac-soduim in Egypt and provide conclusive evidence that a single resistance mechanism alone cannot explain insensitivity in E. colonum to bispyribac-soduim.
    Źródło:
    Journal of Plant Protection Research; 2012, 52, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virulence of geographically different Cryptosporidium parvum isolates in experimental animal model
    Autorzy:
    Sayed, F.G.
    Hamza, A.I.
    Galal, L.A.
    Sayed, D.M.
    Gaber, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/6602.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Opis:
    Cryptosporidium parvum is a coccidian parasite which causes gastrointestinal disease in humans and a variety of other mammalian species. Several studies have reported different degrees of pathogenicity and virulence among Cryptosporidium species and isolates of the same species as well as evidence of variation in host susceptibility to infection. The study aimed to investigate infectivity and virulence of two Cryptosporidium parvum “Iowa isolate” (CpI) and a “local water isolate” (CpW).Thirty-three Swiss albino mice have been divided into three groups: Negative control Group (C), the CpI group infected with “Iowa isolate “and the CpW group infected with C. parvum oocysts isolated from a local water supply. Infectivity and virulence have been measured by evaluating clinical, parasitological and histological aspects of infection. Significant differences were detected regarding oocysts shedding rate, clinical outcomes, and the histopathological picture of the intestine, lung, and brain. It was concluded that the local water isolate is significantly more virulent than the exported one.
    Źródło:
    Annals of Parasitology; 2016, 62, 3
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymptotic profiles for a class of perturbed burgers equations in one space dimension
    Autorzy:
    Dkhil, F.
    Hamza, M. A.
    Mannoubi, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/254933.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Burgers equation
    self-similar variables
    asymptotic behavior
    self-similar solutions
    Opis:
    In this article we consider the Burgers equation with some class of perturbations in one space dimension. Using various energy lunctionals in appropriate weighted Sobolev spaces rewritten in the variables [formula] and log τ, we prove that the large time behavior of solutions is given by the sell-similar solutions ol the associated Burgers equation.
    Źródło:
    Opuscula Mathematica; 2018, 38, 1; 41-80
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acceptance of social fellow groups for learning : extension of Technology Assessment Model (TAM)
    Akceptacja grup społecznych w celach edukacyjnych - rozszerzenie modelu TAM (Technology Assessment Model)
    Autorzy:
    Nawaz, F.
    Shakeel, S.
    Nawaz, Z.
    Hamza, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/362079.pdf
    Data publikacji:
    2017
    Wydawca:
    Wyższa Szkoła Logistyki
    Tematy:
    fellow groups
    perceived usefulness
    perceived ease of use
    Technology Assessment Model
    TAM
    grupy społecznościowe
    postrzegana użyteczność
    postrzegana łatwość użycia
    Opis:
    Background: Students are progressively creating fellow groups on social media for informal communication and learning. Students have groups for assistance, sharing and discussion. This research is carried out to explore the acceptance of fellow groups among students with the help of technology assessment model (TAM). Methods: Date was collected by the use of adepted questionnaire and elaborated by statistical methods with the help of SPSS 21. Results and conclusions: This Research model suggests that students are accepting evolvement of fellow groups in studies; perceived usefulness of groups and ease of use exhibit positive relationship towards attitude towards use. This research also identifies that perceived enjoyment of fellow groups strengthen the relationship of perceived usefulness, perceived ease of use and attitude towards use.
    Wstęp: Studenci tworzą coraz więcej grup społecznych w mediach społecznościowych dla nieformalnej komunikacji oraz edukacji. Są to grupy wsparcia, pomocy oraz dyskusyjne. Celem tej pracy jest sprawdzenie poziomu akceptowalności grup społecznościowych studentów przy pomocy modelu TAM (technology assessment model). Metody: Dane zostały zebrane na podstawie przeprowadzonych ankiet i poddane analizie statystycznej za pomocą SPSS 21. Wyniki i wnioski: Model badawczy sugeruje, że studenci akceptują włączenie grup społecznościowych do procesu nauki, doceniają użyteczność tych grup oraz łatwość stosowania jak również nawiązywania relacji. Zidentyfikowano również zadowolenia ankietowanych osób ze wzmocnienia relacji pomiędzy uczestnikami grup oraz łatwego do nich dostępu.
    Źródło:
    LogForum; 2017, 13, 2; 151-157
    1734-459X
    Pojawia się w:
    LogForum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular screening of gastric Helicobacter pullorum recovered from different avian species in Egypt
    Autorzy:
    Elhelw, R.
    Elhariri, M.
    Salem, H.M.
    Khalefa, H.S.
    Hamza, D.A.
    Ahmed, Z.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539461.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Helicobacter pullorum
    PCR
    sequencing
    chicken
    resident wild birds
    zoonoses
    Egypt
    Opis:
    Helicobacter pullorum ( H. pullorum) is a bacterium that colonizes the intestines of poultry and causes gastroenteritis. Because these species are known as human and/or animal pathogens, identification of H. pullorum is becoming increasingly necessary. The bacterium has been linked to colitis and hepatitis in humans after being transmitted by infected meat consumption. Misdiagnosis of other enteric zoonotic pathogens such as Campylobacter and other Helicobacter species makes the diagnosis of H. pullorum extremely difficult. This study focused on the molecular detection of H. pullorum from the stomach (proventriculus and gizzard) of different avian species as new target organs for detection and transmission between avian species. Proventriculus and gizzards were obtained from 40 freshly dead chickens and resident wild birds (n=40). Diarrhea was found in the farms that were surveyed. DNA was extracted from all collected samples to conduct PCR amplification. The samples were screened for Helicobacter genus-specific 16s using C97 and C05 primers. To confirm the existence of H. pullorum, the positive samples were sequenced. H. pullorum was recorded in two out of 40 chicken samples. In addition, H. pullorum was recorded in one out of 40 resident wild birds. The 16S rRNA gene sequence for Helicobacter genus-specific in poultry and wild birds showed a 100% homology. In conclusion, broiler chickens and resident wild birds are possible reservoirs for H. pullorum, according to this report, and possibly act as a source of infection for humans via the food supply.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 3; 369-374
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antidiarrheal activity of fractions from aqueous extract of Detarium senegalense
    Działanie przeciwbiegunkowe różnych frakcji wyciągu wodnego z Detarium senegalense
    Autorzy:
    Sanni, F.S.
    Hamza, H.G.
    Onyeyili, P.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/72078.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    plant material
    plant extract
    water extract
    Detarium senegalense
    stem bark
    Leguminosae
    antidiarrheal activity
    Opis:
    The aim of this study was to evaluate the effect of different fractions of the aqueous crude extract of Detarium senegalense stem bark on castor oil-induced diarrhea. Castor oilinduced diarrhea, gastrointestinal motility and castor oil-induced enteropooling methods were used to evaluate the antidiarrheal effects of the fractions. Castor oil was used to induce diarrhea and the effect of all the fractions (chloroform, ethyl acetate, n-butanol, methanol and residual aqueous) were evaluated at the doses of 200 and 400 mg/kg body weight. The results show that all fractions significantly (p<0.05) decreased the frequency of defecation in rats following the induction of diarrhea with castor oil. Ethyl acetate which produced the highest antidiarrheal activity was further subjected to gastrointestinal motility and castor oil-induced enteropooling tests. In the gastrointestinal motility, two test doses of the extract (200 and 400 mg/kg) were administered orally to two groups of rats (n=5), while the third group of rats (control), were treated with normal saline, and the fourth group were treated with diphenoxylate, a conventional anti-diarrheal drug. In the castor oil-induced enteropooling experiment, normal saline was used for the control animals, while 200 and 400 mg/kg of the extract was administered to groups two and three, respectively and atropine, a standard drug, was administered to rats in group four. The ethyl acetate fraction significantly (p<0.05) decreased the gastro-intestinal motility, as shown by the extent of movement of the charcoal meal in the treated rats. It also significantly inhibited the fluid accumulation within the intestine. These findings suggest that the ethyl acetate fraction possess antidiarrheal effect, which may be due to the presence of some phytochemical constituents (alkaloids, flavonoids and tannins) in the plant, which may either be working alone or in combination with each other. This study has demonstrated that D. senegalense fractions, especially the ethyl acetate fraction, possess antidiarrheal activity thus supporting the use of the plant in the treatment of diarrheal diseases.
    Celem niniejszej pracy było określenie wpływu różnych frakcji surowego wyciągu wodnego z kory pnia Detarium senegalense na hamowanie biegunki indukowanej olejem rycynowym u szczurów. Działanie przeciwbiegunkowe tych frakcji, po wywołaniu biegunki olejem rycynowym, określono na podstawie obserwacji ruchów robaczkowych jelit oraz gromadzenia płynu w świetle jelita. Badano działanie przeciwbiegunkowe różnych frakcji (chloroformowej, n-butanolowej, metanolowej oraz otrzymanej za pomocą octanu etylu, jak i pozostałości wodnej) w dawkach 200 i 400 mg/kg masy ciała szczura. Badania wykazały, że wszystkie frakcje istotnie (p<0.05) obniżyły częstość defekacji u szczurów po wywołaniu biegunki w stosowanym modelu. Frakcja otrzymana przez działanie octanem etylu, wykazująca najsilniejsze działanie przeciwbiegunkowe, została następnie użyta w ocenie ruchów robaczkowych jelita i gromadzenia płynów w jego świetle. W teście oceny ruchów robaczkowych jelit dwóm grupom szczurów (n=5) podawano dwie dawki wyciągu (200 i 400 mg/kg), trzecia kontrolna grupa szczurów była traktowana izotonicznym roztworem soli, natomiast czwarta difenoksylatem jako standardowym lekiem przeciwbiegunkowym. W teście oceny gromadzenia płynów w świetle jelita grupie kontrolnej podano izotoniczny roztwór soli, grupie drugiej i trzeciej podano odpowiednio 200 i 400 mg/kg wyciągu, natomiast czwartej grupie podano atropinę jako lek standardowy. Stwierdzono, że frakcja otrzymana za pomocą octanu etylu istotnie (p<0.05) spowolniła ruchy robaczkowe jelit, co zaobserwowano jako stopień hamowania efektu wywołanego podaniem węgla drzewnego szczurom. Frakcja ta również istotnie hamowała gromadzenie płynu w jelicie. Otrzymane rezultaty sugerują, że frakcja otrzymana za pomocą octanu etylu ma właściwości przeciwbiegunkowe, prawdopodobnie ze względu na obecność w roślinie aktywnych związków chemicznych (alkaloidów, flawonoidów i tanin), które mogą działać bądź pojedynczo lub jako ich kombinacja. Podsumowując wykazano, że frakcje z D. senegalense, a szczególnie frakcja otrzymana za pomocą octanu etylu, mają właściwości przeciwbiegunkowe, co może wskazywać na możliwość zastosowania badanej rośliny do leczenia chorób przebiegających z biegunką.
    Źródło:
    Herba Polonica; 2015, 61, 2
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phenobarbital analysis in biological matrix (blood) by high performance liquid chromatography (HPLC)
    Autorzy:
    Hamza, O.
    Mohamed Moktar, B.
    Chohra Mostafa, B.
    Zeghdaoui, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412593.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Phenobarbital
    HPLC
    blood
    extraction
    biological matrix
    Opis:
    In this work, we have tried to contribute to the analysis of phenobarbital in the blood. To do this, we used different analytical techniques such as liquid chromatography (HPLC). The results obtained in the course of our work, we can conclude that: The HPLC method was separate phenobarbital endogenous blood components, and optimizing the conditions of chromatographic separation as the composition of the mobile phase consisting of 20 % acetonitrile + 20 % methanol + 60 % ammonium acetate buffer. The extraction with diethyl ether to pH = 4; The chromatographic column, microbondapack ZORBAX C18. A system of diode-array UV detection at 254 nm.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 1; 31-40
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pre-designing of a mechatronic system using an analytical approach with Dymola
    Autorzy:
    Hamza, G.
    Choley, J.-Y.
    Hammadi, M.
    Riviere, A.
    Barkallah, M.
    Louati, J.
    Haddar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/281893.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    pre-dimensioning
    Dymola
    analytical method
    vibration
    rectangular plate
    Opis:
    This paper presents a pre-dimensioning method applied to a mechatronic system and regarding the vibrational aspect, through a simple modeling process in Dymola environment. We study the vibration transmission between dynamic exciters (motors) and receivers (electronic cards) which are located on a simply supported rectangular plate, using an analytical approach. This new method will allow us to perform representative and robust modeling and simulation. The solution for this issue would be a pre-sizing and pre-positioning procedure. It aims to determine a set of possible technical solutions and principal characteristics before the definitive choice of components and precise sizing of the system. The presented method predicts also behaviour of the mechatronic system. In order to validate the model with respect to the finite element method, selected simulation results are presented.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 697-710
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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