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Wyświetlanie 1-15 z 150
Tytuł:
Insecticidal activities of essential oils from some cultivated aromatic plants against Ppodoptera littoralis (Boisd)
Autorzy:
Souguir, S.
Chaieb, I.
Cheikh, Z.B.
Laarif, A.
Powiązania:
https://bibliotekanauki.pl/articles/64991.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Medicinal plant species were tested for their fumigant activity against Spodoptera littoralis third instar larvae. Responses varied according to plant species and parts used. For the present investigation, volatile oils were obtained from: Foeniculum vulgare (flowers and seeds), Coriandrum sativum (seeds), Daucus carota (flowers), Pelargonium graveolens (leaves and flowers), Origanum majorana (leaves and flowers), and Salvia officinalis (leaves). Fumigant activity was observed after 24 hours of exposure. All essential oils were proved to be toxic to the third instar larvae. However, the highest mortality was observed in the essential oil of S. officinalis leaves, C. sativum seeds, F. vulgare seeds, D. carota flowers, and O. majorana leaves with LC50 = 23.050 μl/l air, 68.925 μl/l air, 95.075 μl/l air, 99.300 μl/l air, and 100.925 μl/l air, respectively. Other oils showed an LC50 between 101 and 183 μl/l air.
Źródło:
Journal of Plant Protection Research; 2013, 53, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Germocyte lesions caused by porcine circovirus type 2b in Kunming mice
Autorzy:
Yuan, A.W.
Pang, P.
Gong, Q.L.
Deng, Z.B.
Powiązania:
https://bibliotekanauki.pl/articles/31710.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Porcine circovirus type 2 (PCV2) has been known as a causative agent of reproductive failure in the sow. In the present study mouse model was used to investigate PCV2 infection. In order to investigate whether PCV2 can induce lesions of spermatocytes and oocytes, 6 male and 6 female mice were each inoculated intraperitoneally with PCV2b, and 3 male and 3 female mice mock-infected with cell culture supernatant served as controls. Samples of testes and ovaries from PCV2b-inoculated and mock-infected mice were investigated using PCR, histopathological, ultrastructural and immunofluorescent histochemical methods at 14 and 21 day post infection (dpi). The study revealed that in the virus-inoculated mice leydig cells in testes and granulosa cells in ovaries were degenerated, and a small number of spermatocytes and oocytes showed apoptosis. Positive PCV2b antigen signals were also observed in these apoptotic cells. It can be suggested that PCV2 can cause lesions of spermatocyte and oocyte prior to zygotes formation in its host.
Źródło:
Polish Journal of Veterinary Sciences; 2017, 20, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical transmission of PCV2b to fetuses in sows intramuscularly infected with PCV2b
Autorzy:
Wang, N.D.
Li, J.J.
Wang, A.B.
Zhu, Z.
Chang, Y.
Mao, Y.
Zan, Y.
Wang, Z.F.
Deng, Z.B.
Powiązania:
https://bibliotekanauki.pl/articles/31535.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
In order to investigate whether PCV2b can be transmitted across the placenta in sows thereby causing vertical infection of fetuses, six sows in 75 day of pregnancy were either intramuscularly inoculated with a PCV2b culture supernatant (n = 4) or mock infected with cell culture supernatant (n = 2). At parturition, 3 newborn piglets from each litter were randomly selected and euthanatized prior to suckling. Samples of the mesenteric lymph nodes, spleens, kidneys, hearts and lungs were collected for PCR, histopathological and immunohistochemical assays. The results showed that the newborn piglets from PCV2b-infected sows had histopathological lesions in the tested tissues. Moreover, PCV2b antigen and DNA were detected as well. These findings therefore suggested that porcine circovirus type 2b can be transmitted across the placenta of sows, thereby leading to PCV2b vertical infection of the fetuses.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The distribution of different virulence grass carp reovirus strains in some neglected tissues
Autorzy:
Liang, H.R.
Fu, X.Z.
Li, N.Q.
Liu, L.H.
Lin, Q.
Li, Y.G.
Peng, Y.A.
Huang, Z.B.
Wu, S.Q.
Powiązania:
https://bibliotekanauki.pl/articles/30668.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of the Magnetic Field Using Transversal 3D Coil System
Autorzy:
Garda, B.
Galias, Z.
Powiązania:
https://bibliotekanauki.pl/articles/227140.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gradient coils
homogeneous magnet design
optimization
Opis:
Magnetic field is usually generated using magnets realized as a set of simple coils. In general, those magnets generate magnetic field with nonzero components in all directions. Usually during the design process only one component of the magnetic field is taken into account, and in the optimization procedure the currents and positions of simple coils are found to minimize the error between the axial component of the magnetic field and the required magnetic field in the ROI. In this work, it is shown that if the high quality homogeneous magnetic field is generated then indeed one may neglect non-axial components. On the other hand, if the obtained magnetic field is not homogeneous either due to design requirements of too restrictive constrains, then all other components may severely deteriorate the quality of the magnetic field. In the second part of the paper, we show how to design a 3D transversal coil system to solve problems which are intractable in the 1D case.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 205-210
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactivity of heat-stable Leptospira antigenic preparation used in enzyme-linked immunosorbent assay for detection of antibodies in swine serum
Autorzy:
Wasinski, B.
Pejsak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/31088.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reactivity
Leptospira
antigen preparation
enzyme-linked immunosorbent
detection
antibody
pig
serum
antigen
animal disease
leptospirosis
laboratory diagnosis
ELISA test
Opis:
Serology plays an important role in laboratory diagnosis of leptospirosis. Apart from the most often used microscopic agglutination test (MAT), enzyme-linked immunosorbent assay (ELISA) seems to be useful especially in screenings of animal herds. The ELISA used for detection of antibodies against selected Leptospira serogroups in swine serum samples was investigated during the study. An essential element of this test is heat-stable antigenic preparation from cultures of Leptospira interrogans serovars Icterohaemorrhagiae, Pomona and L. borgpetersenii serovar Sejroe. The aim of the present study was to identify and analyze ELISA heat-stable antigen fractions playing a role in the reaction with leptospiral antibodies indicated in swine serum. Reactivity of the three-component antigenic preparation was compared in immunoblotting with reactivity of six heat-stable antigenic preparations made from the following single serovars: L. interrogans serovars Icterohaemorrhagiae, Pomona, Canicola, L. borgpetersenii serovars Sejroe, Tarassovi and L. kirshneri serovar Grippotyphosa. All antigenic preparations were submitted to SDS-PAGE and transferred to a nitrocellulose membrane using a semidry system. After the transfer, the membrane was incubated with diluted swine serum containing antibodies specific for one of the six above mentioned Leptospira serovars. For the three-component antigenic preparation and antigens prepared from single serovars the immunoblot revealed reaction of sera with fractions of the 20-26 kDa region and around the 14.5 kDa region. The investigated heat-stable Leptospira antigenic preparation contains fractions demonstrating serogroup- and species-specificity. Fraction 20-26 kDa showed serogroup-specific activity, whereas the fraction around 14.5 kDa showed species-specific activity.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat power determination of Dv-290 refrigerator’s evaporator on the basis of thermodynamic parameters of inlet air
Określenie mocy cieplnej parownika chłodziarki Dv-290 na podstawie parametrów termodynamicznych powietrza wlotowego
Autorzy:
Nowak, B.
Kuczera, Z.
Powiązania:
https://bibliotekanauki.pl/articles/218808.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
klimatyzacja kopalń
chłodzenie powietrza
chłodziarka sprężarkowa
moc cieplna
air conditioning of mines
air cooling
compression refrigerator
thermal power
Opis:
The present paper introduces a method for calculating the thermal power of DV-290 mining air cooler’s evaporator. The power usually differs from the nominal power given by the manufacturer. The thermodynamic parameters of cooled air are not obtained as a result of in situ measurements, but in indirect manner that is by determining the evaporation and condensation’s pressure values of R407C refrigerant. The pressure dependencies formulated as a function of air enthalpy at the evaporator’s inlet were obtained using calculations of a computer program which solves the system of equations describing heat and mass transfer in the refrigerator’s compressor on the basis of previous measurements of air performed before and after its cooling. The obtained dependencies are demonstrated in a graphical (fig. 2 and fig. 3) and analytical (the regression equations (19) and (20)) manner, the values of correlation coefficients are also presented. For the known evaporation and condensation pressure values of the refrigerant, and thus for its basic physical parameters the complete thermal power of the evaporator was determined, that is its: air cooling overt power, dehumidification occult power, temperature, relative humidity and specific humidity of air after its cooling. In addition, using the mentioned method, the capacity of DV-290 refrigerator’s evaporator is provided for the given thermodynamic parameters of air before cooling, along with air thermodynamic parameters after cooling.
W pracy zaproponowano metodę obliczania mocy cieplnej parownika górniczej chłodziarki powietrza DV-290. Moc ta zazwyczaj jest różna od mocy znamionowej podanej przez jej producenta. Wymaganą znajomość parametrów termodynamicznych schłodzonego powietrza otrzymuje się, nie jak dotychczas w wyniku ich pomiarów in situ, lecz drogą pośrednią wyznaczając najpierw wartości ciśnień parowania i skraplania czynnika chłodniczego R407C. Odpowiednie zależności tych ciśnień w funkcji jednostkowej entalpii powietrza na wlocie parownika otrzymano, na podstawie wcześniejszych pomiarów parametrów powietrza przed i po jego schłodzeniu, z obliczeń utworzonym programem komputerowym rozwiązującym układ równań opisujący wymianę ciepła i masy w chłodziarce sprężarkowej. Uzyskane zależności przedstawiono w sposób graficzny (rys. 2 i rys. 3) oraz analityczny - równania regresji (19) i (20), podając też wartości współczynników korelacji. Dla znanych wartości ciśnień parowania i skraplania czynnika chłodniczego, a więc także i jego podstawowych parametrów fizycznych, korzystając z wymienionego programu komputerowego, wyznaczono, w funkcji jednostkowej entalpii powietrza na wlocie parownika, całkowitą jego moc cieplną z podziałem na moc jawną ochładzania powietrza, utajoną moc osuszania powietrza, temperaturę, wilgotność względną i wilgotność właściwą powietrza po jego ochłodzeniu. Podano też, dla przykładowych zadanych parametrów termodynamicznych powietrza przed jego schłodzeniem obliczone wspomnianą metodą, moce parownika chłodziarki DV-290 oraz parametry termodynamiczne powietrza po schłodzeniu.
Źródło:
Archives of Mining Sciences; 2012, 57, 4; 911-920
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence of leptospiral infections in swine population in Poland evaluated by ELISA and microscopic agglutination test
Autorzy:
Wasinski, B.
Pejsak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/31105.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
occurrence
pig
population
Polska
ELISA test
microscopic agglutination test
leptospirosis
animal infection
Leptospira
serogroup
zoonotic disease
Opis:
Swine are one of significant reservoirs and sources of Leptospira infections for man. Serological screenings help to effectively control the epidemiological situation in swine herds and to prevent transmission of Leptospira from animals to man. The purpose of this study was to investigate, by the use of serological methods, the prevalence of infections caused by selected Leptospira serogroups in swine population in Poland. A total of 7112 swine serum samples were examined. The samples were collected from January to October 2008 and came from 280 counties situated in all 16 provinces of Poland. All sera were examined preliminary by enzyme-linked immunosorbent assay (ELISA) using heat-stable antigenic preparation. The samples positive or doubtful in ELISA were investigated by microscopic agglutination test (MAT) with use of serovars Icterohaemorrhagiae, Pomona, Canicola, Sejroe, Tarassovi and Grippotyphosa. Of the collected sera examined by ELISA 73 (1.02%) samples were positive, 85 (1.20%) – doubtful and 6954 – negative. Among ELISA-positive and doubtful sera 64 samples (coming from 14 provinces) were recognized in MAT as positive. Among MAT positive samples 42.19% of sera demonstrated titres with serovar Pomona, 32.81% – with Sejroe, 14.06% – with Icterohaemorrhagiae, 6.25% – with Tarassovi, 3.13% – with Grippotyphosa and 1.56% with Canicola.
Źródło:
Polish Journal of Veterinary Sciences; 2010, 13, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of using chemical-free root-knot nematode (Meloidogyne incognita) control methods on the occurrence of blossom-end rot in pepper
Autorzy:
Mandoki, Z.
Penzes, B.
Powiązania:
https://bibliotekanauki.pl/articles/65175.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Pepper takes up the largest growing area among forced vegetables in Hungary. The most significant abiotic disease problem of this plant is blossom-end rot (BER), which can cause substantial yield losses. The uptake of calcium by plants from the soil may be negatively affected by many factors such as root-knot nematodes feeding on the roots. The nematodes then impede water and nutrient transport. In Hungary, Meloidogyne incognita is the most common root-knot nematode species in greenhouses. The use of resistant cultivars is undoubtedly the most successful control method of root-knot nematodes in warm climates. Growing of resistant pepper cultivars, and grafting onto resistant rootstocks offer alternative, environmentally friendly ways of control. The main objective of this study was to investigate the effect of both growing resistant pepper cultivars and using resistant rootstocks on the occurrence of fruit showing symptoms of BER. Research was carried out in a plastic tunnel with soil which was heavily infested with M. incognita. Roots of the non-resistant cultivars were moderately damaged by the pest at the end of the vegetation period. After grafting these cultivars onto two different resistant rootstocks, symptoms of damage caused by M. incognita were not observed on the rootstocks. There was a negligible number of galls appearing on the roots of the resistant cultivar Cinema F1. Due to the resistance properties and other characteristics of the newly bred Cinema F1, fruit of this cultivar rarely show symptoms of calcium deficiency. In most cases, there was less fruit with BER symptoms in plants grafted onto rootstocks Robusto F1 or Snooker F1. The results showed a reduction in the extent of damage caused by the root-knot nematode, and there were other beneficial effects of the rootstocks on the scions. The occurrence of fruit showing symptoms of BER was reduced.
Źródło:
Journal of Plant Protection Research; 2012, 52, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 150

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