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Wyświetlanie 1-15 z 1384
Tytuł:
In vitro production of Sudanese camel (Camelus dromedarius) embryos from epididymal spermatozoa and follicular oocytes of slaughtered animals
Autorzy:
Abdelkhalek, A.E.
Gabr, S.A.
Khalil, W.A.
Shamiah, S.H.
Pan, L.
Qin, G.
Farouk, M.H.
Powiązania:
https://bibliotekanauki.pl/articles/31345.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Application of assisted reproductive technology in camelidea, such as artificial insemination (AI) and embryo transfer, has been slow in comparison to that for other livestock species. In Egypt, there are few attempts to establish in vitro maturation (IVM) and fertilization (IVF) techniques in dromedary camel. The present study was carried out to produce Sudanese camel embryos using in vitro matured oocytes and epididymal spermatozoa. Dromedary camel ovaries were collected from abattoirs and then, the oocytes were aspirated from all the visible follicles on the ovarian surface (~2-8 mm in a diameter). Meanwhile, Fetal Dromedary Camel Serum (FDCS) was obtained from camel fetuses after slaughtering. Thereafter, only Cumulus Oocyte Complexes (COCs) were matured in vitro in the Tissue Culture Medium (TCM-199) complemented with 10% FDCS. Spermatozoa required for in vitro fertilization were collected from testes (epididymal cauda) of the slaughtered camel bulls. The results clearly showed that the maturation rate of oocytes at metaphase II was about 59.5% while the fertilization rate was around 70.4%. Intriguingly, the embryo rates determined were 13.1%, in 2-cell; 0.0%, in 4-cell; 34.7%, in 8-16% cell; 39.1%, in morula and 13.1% in a blastocyst stage. This study represented a successful in vitro production of Sudanese dromedary camel embryos from epididymal sperm cells and in vitro matured oocytes recovered from slaughtered camels.
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:
The effect of injection pressure and strategy in a Jaguar V6 diesel engine
Autorzy:
Abdullah, N. R.
Mamat, R.
Rounce, P.
Wyszynski, M. L.
Tsolakis, A.
Xu, H. M.
Tian, G.
Powiązania:
https://bibliotekanauki.pl/articles/242414.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion
emissions
injection strategies
premixed combustion
ignition delay
Opis:
In recent years, the improvement of engine performance and emissions has become an extremely important concern. This study focuses on the injection strategy based on the injection pressure (IP) and duration between pilot injection and the main injection (dMI) using a multi cylinder common rail multiple injections diesel engine. The study was designed to produce improvements in fuel mixing via the injection strategy, to reduce the main ignition delay. This would contribute to a minimum amount of fuel burnt in the premixed combustion phase, leading to a reduction in emissions. Recent evidence shows that premixed combustion is significant in the controlling of emissions of nitrogen oxides (NOx) and soot. Six different IPs combined with a short and long dMI were compared in the attempt to improve engine performance and emissions. The engine performance was measured in terms of brake specific fuel consumption, ignition delay, heat release and peak in-cylinder pressure and emissions, specifically nitrogen oxides (NOx), total unburned hydrocarbons (THC), carbon monoxide (CO) and smoke emissions for each engine test condition. The evidence from this study shows that the effect of IP is more dominant than dMI in terms of peak cylinder pressure, heat release, brake specific fuel consumption and emissions. However, the dMI shows a strong effect at a higher engine speed.
Źródło:
Journal of KONES; 2009, 16, 2; 9-22
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Key development factors of the transit and transport potential of Kazakhstan
Kluczowe czynniki rozwoju tranzytowego-transportowego potencjału Kazachstanu
Autorzy:
Abdullayev, S.
Kiseleva, O.
Adilova, N.
Bakyt, G.
Vakhitova, L.
Powiązania:
https://bibliotekanauki.pl/articles/374177.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
transit-transport potential
international transport corridor
transport infrastructure
investment transport
logistics hub
potencjał tranzytowo-transportowy
międzynarodowy korytarz transportowy
infrastruktura transportowa
inwestycje transportowe
centrum logistyczne
Opis:
Nowadays, the Republic of Kazakhstan is dynamically forming up its transit policy, improving its directions and the development of new vectors. This article looks into the development of the transit and transport potential of the Republic of Kazakhstan. It presents the main conclusions on the development of a feasibility study for the construction of a logistics terminal in the seaport of Lianyungang (China) as one of the directions of building transit policy, improving its direction and the formation of new vectors. The urgency of building a logistics terminal is conditioned by the necessity for national interests and further expansion of political and economic advantages of Kazakhstan.
Сегодня Республика Казахстан находится в процессе активного выстраивания своей транзитной политики, совершенствования ее направлений и формирования новых векторов. В статье рассматриваются вопросы развития транзитно - транспортного потенциал а Республики Казахстан. Представлены основные выводы по разработке ТЭО строительства логистического терминала в морском порту Ляньюньган (КНР) как одного из направлений выстраивания транзитной политики, совершенствования ее направлений и формирования новых векторов . Актуальность строительства логистического терминала продиктована необходимостью реализации национальных интересов и дальнейшего наращивания политических и экономических преимуществ Казахстана .
Źródło:
Transport Problems; 2016, 11, 2; 17-26
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strengthening relations between employers and universities through European projects
Wzmocnienie relacji pomiędzy pracodawcami i uczelniami poprzez projekty europejskie
Autorzy:
Achim, M I
Dragolea, L.
Kadar, M
Balan, G.
Powiązania:
https://bibliotekanauki.pl/articles/404644.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska
Tematy:
European project
employer
student
projekt europejski
pracodawca
Opis:
The purpose of this article is to emphasize the importance of preserving a good collaboration relationship between employers and universities, and the major role that can be played by the European projects in strengthening this connection. The case study shows the way in which a university that is small, but very active as regards the accessing of projects and has the aim to provide a high quality educational service can improve the effectiveness of the educational activity.
Celem niniejszego artykułu jest podkreślenie znaczenia zachowania dobrych relacji współpracy pomiędzy pracodawcami a uczelniami wyższymi, a także istotnej roli, jaka może być odgrywana przez projekty europejskie we wzmacnianiu tego powiązania. Niniejsze studium przypadku pokazuje, w jaki sposób uczelnia, która jest mała, jednak bardzo aktywna, jeśli chodzi o dostęp do projektów, mająca za cel zapewnienie wysokiej jakości usług edukacyjnych, może poprawić efektywność działalności edukacyjnej.
Źródło:
Polish Journal of Management Studies; 2014, 9; 7-13
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chloroplast protease/chaperone AtDeg2 influences cotyledons opening and reproductive development in Arabidopsis
Autorzy:
Adamiec, M.
Jagodzik, P.
Wyka, T.P.
Ludwikow, A.
Mitula, F.
Misztal, L.
Lucinski, R.
Jackowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/56435.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
AtDeg2 is a chloroplast protein with dual protease/chaperone activity. Since data on how the individual activities of AtDeg2 affect growth and development of Arabidopsis thaliana plants is missing, two transgenic lines were prepared that express mutated AtDeg2 versions that have either only protease or chaperone activity and a comprehensive ontogenesis stage-based study was performed comprising wild type (WT) plants and insertional mutants that do not express AtDeg2, as well as the two transgenic lines. The repression of both AtDeg2 activities in deg2-3 mutants altered just a few phenotypic traits including the time when cotyledons were fully opened, the time when 10% flowers were open as well as the number of inflorescence branches and seed length in plants which have completed their generative development. It was demonstrated that complete opening of cotyledons as well as the number of inflorescence branches and seed length in plants which have completed their generative development required involvement of both AtDeg2 activities, whereas the time when 10% of flowers were open was controlled by AtDeg2 protease activity. These results show for the first time that the chaperone activity of AtDeg2 is needed for some elements of generative development of A. thaliana plants to proceed normally. So far, the chaperone activity of AtDeg2 was confirmed based on in vitro assays only.
Źródło:
Acta Societatis Botanicorum Poloniae; 2018, 87, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Proximate Analysis of Five Commercially Sold Maggi as Condiments in Gwagwalada, North Central, Nigeria
Autorzy:
Adeeko, E. L.
Shittu, G. A.
Adeeko, T. O.
Umar, M.
Powiązania:
https://bibliotekanauki.pl/articles/1075587.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
bioaccumulation
bouillon
condiments
heavy metal
mineral elements
proximate
Opis:
Determination of the proximate, nutritionally valuable mineral in five samples of food seasonings label as, A, B, C, D, & E food condiments readily consumed in Nigeria were obtained from Gwagwalada Central Market Abuja. Investigating the concentrations of some mineral elements such as, iron (Fe), zinc (Zn), and two heavy metals, cadmium (Cd) and lead (Pb) were carried out using AA320N Atomic Absorption Spectrophotometer (AAS) after acid digestion with 2:1 HNO3/HClO4. The result shows that all samples contained high levels of protein (13.63% ±0.53%) with mean value moisture, ash, fat, fiber, and carbohydrate for all samples levels being (3.94%±0.64%), (57.51% ±4.27%), (5.11% ±0.20%), (0.02% ±0.00%) and (18.41% ±0.41%) respectively. Sample D has high Fe concentration with (0.04 ±0.01 μg/g) and Sample B & C has low Fe concentration with (0.01 ±0.00 μg/g). Sample D & E has high Zn concentration with (0.03 ±0.01 μg/g) and sample A, B & C has low Zn concentration with (0.02 ±0.01 μg/g). In cadmium, sample A has the high concentration (0.03±0.01μg/g), sample B & D has the low Cd concentration (0.02 ±0.00 μg/g). Sample D had the high Pb concentration (0.05 ±0.00 μg/g), sample C had the low Pb concentration (0.02±0.01 μg/g). In conclusion, Fe, Zn, Cd and Pb were both present in low concentrations in all the samples analyzed. The presence of Cd and Pb in the food seasonings even at low concentration could prove fatal through bioaccumulation. The low level of the toxic metals, Pb and Cd indicates that these products meet the safe limits specified by most food standards.
Źródło:
World Scientific News; 2019, 122; 183-192
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical constituents of water hyacinth (Eichhornia crassipes) methanol leaf extract and its effect on selected enzymes of Periplaneta americana
Autorzy:
Adeleke, G.E.
Adedosu, O.T.
Ehigie, L.
Adegbola, P.I.
Olaniyi, A.A.
Agoola, T.O.
Ehigie, A.F.
Powiązania:
https://bibliotekanauki.pl/articles/2096284.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Eichhornia crassipes
spectroscopy
chromatography
Periplaneta americana
antioxidant enzymes
esterases
Opis:
Eichhornia crassipes (water hyacinth) possesses several biological properties. Periplaneta americana (cockroach) is a household insect pest that can disseminate pathogens. The present study analyses the chemical constituents of water hyacinth leaf methanol extract and its in vitro effects on antioxidant and esterase enzymes in cockroaches. Water hyacinth methanol extract (WHME) was subjected to gas chromatography-flame ionization detection (GC-FID). Crude enzyme preparations were obtained from nymph and adult cockroaches. In vitro effects of different concentrations (10–80 μg/ml) of WHME on superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), acetylcholinesterase (AChE), and carboxylesterase (CE) in crude enzyme preparations were spectrophotometrically measured using cypermethrin (CYP) and chlorpyrifos (CPF) as reference insecticides. The GC-FID chromatogram of WHME showed the presence of gallic acid, para-hydroxybenzoic acid, eritosin, gentisic acid, catechin, protocatechuric acid, quercetin, and eugenol. The WHME and CPF reduced catalase in adults and SOD in nymphs, while CYP and CPF reduced SOD activity in the adults of P. americana. GST was significantly increased by WHME in both nymph and adult cockroaches. AChE was reduced by WHME, CYP, and CPF in nymphs, while CE was increased by WHME in nymphs and adults as compared to the control. In conclusion, our study indicates a high phenolic content in the water hyacinth leaf methanol extract, which increased the activities of the antioxidant enzymes AChE and CE in P. americana. The results also show that the efficacy and the mode by which the extracts could induce toxicity depend on the growth stage of the cockroach.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 323-336
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical examination of an unsteady nonlinear MHD flow in the presence of thermal radiation and heat generation
Autorzy:
Agbaje, T. M.
Leach, P. G. L.
Powiązania:
https://bibliotekanauki.pl/articles/1839890.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ MHD
promieniowanie cieplne
wytwarzanie ciepła
unsteady MHD flow
spectral perturbation method
spectral relaxation method
thermal radiation
heat generation
Opis:
In this study, the spectral perturbation method and the spectral relaxation method are used to solve the nonlinear differential equations of an unsteady nonlinear MHD flow in the presence of thermal radiation and heat generation. The SPM is mainly based on series expansion, generating series approximation coupled with the Chebyshev spectral method. The numerical results generated using the spectral perturbation method were compared with those found in the literature, and the two results were in good agreement.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 1-17
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Diversity for Classifier Ensemble Pruning : an Empirical Investigation
Autorzy:
Ahmed, M. A. O.
Didaci, L.
Lavi, B.
Fumera, G.
Powiązania:
https://bibliotekanauki.pl/articles/375851.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiple classifier systems
ensemble pruning
diversity measures
Opis:
The concept of `diversity' has been one of the main open issues in the field of multiple classifier systems. In this paper we address a facet of diversity related to its effectiveness for ensemble construction, namely, explicitly using diversity measures for ensemble construction techniques based on the kind of overproduce and choose strategy known as ensemble pruning. Such a strategy consists of selecting the (hopefully) more accurate subset of classifiers out of an original, larger ensemble. Whereas several existing pruning methods use some combination of individual classifiers' accuracy and diversity, it is still unclear whether such an evaluation function is better than the bare estimate of ensemble accuracy. We empirically investigate this issue by comparing two evaluation functions in the context of ensemble pruning: the estimate of ensemble accuracy, and its linear combination with several well-known diversity measures. This can also be viewed as using diversity as a regularizer, as suggested by some authors. To this aim we use a pruning method based on forward selection, since it allows a direct comparison between different evaluation functions. Experiments on thirty-seven benchmark data sets, four diversity measures and three base classifiers provide evidence that using diversity measures for ensemble pruning can be advantageous over using only ensemble accuracy, and that diversity measures can act as regularizers in this context
Źródło:
Theoretical and Applied Informatics; 2017, 29, 1-2; 25-39
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histopathological study of Corydoras micracanthus (Siluriformes: Callichthyidae) parasitized by the nematode Procamallanus (Spirocamallanus) pintoi (Camallanidae) from Lesser River, northwestern Argentina, South America
Autorzy:
Ailan-Choke, L.G.
Sanchez, R.
Cremonte, F.
Ramallo, G.
Davies, D.
Powiązania:
https://bibliotekanauki.pl/articles/5910.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Parazytologiczne
Źródło:
Annals of Parasitology; 2019, 65, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan zagrożenia żelbetowych zbiorników na wodę poddanych wpływom ciągłych i nieciągłych deformacji górniczych terenu
Hazards in reinforced concrete water tanks affected by continuous and noncontinuous mining-related ground deformation
Autorzy:
Ajdukiewicz, A.
Szojda, L.
Wandzik, G.
Powiązania:
https://bibliotekanauki.pl/articles/160707.pdf
Data publikacji:
2012
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
zbiornik na wodę
zbiornik żelbetowy
teren górniczy
deformacja górnicza
stan zagrożenia
water tank
reinforced concrete tank
mining area
mining deformation
emergency
Opis:
Tematem referatu jest analiza odporności zespołu sześciu zbiorników żelbetowych o średnicy 33,0 m i wysokości około 9,5 m każdy, poddanych działaniu ciągłych i nieciągłych deformacji górniczych terenu. Sposób zabezpieczenia przed możliwością wystąpienia stanu awaryjnego stanowi jedną z kwestii poruszonych w referacie.
This paper presents an analysis of the resistance of a set of six reinforced concrete tanks each 33.0 m in diameter and approximately 9.5 m in height, subjected to the action of continuous and non-continuous mining-related ground deformation. One of the issues addressed is the method of preventing failure states.
Źródło:
Przegląd Budowlany; 2012, R. 83, nr 4, 4; 96-99
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The proposal of the Swedish Committee on Management of Non-Nuclear Radioactive Waste (IKA)and the implications for the management of NORM and storage of NORM waste
Zalecenia szwedzkiego Komitetu do Spraw Postępowania z Niejądrowymi Odpadami Promieniotwórczymi (IKA) i ich implikacje przy zarządzaniu i składowaniu odpadów NORM
Autorzy:
Akerblom, G.
Hagberg, N.
Mjones, L.
Soderman, A.
Powiązania:
https://bibliotekanauki.pl/articles/340208.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
odpady radioaktywne
prawo ochrony radiologicznej
ochrona radiologiczna w Szwecji
radioactive wastes
radiological defense low
radiological protection in Sweden
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 62-63
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temporal analysis of adaptive face recognition
Autorzy:
Akhtar, Z.
Rattani, A.
Foresti, G. L.
Powiązania:
https://bibliotekanauki.pl/articles/91602.pdf
Data publikacji:
2014
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
aging process
facial biometrics
virtual template synthesis
complex 3D modelling techniques
temporal variation
query data
facial representation
facial age progression process
Opis:
Aging has profound effects on facial biometrics as it causes change in shape and texture. However, aging remains an under-studied problem in comparison to facial variations due to pose, illumination and expression changes. A commonly adopted solution in the state-of-the-art is the virtual template synthesis for aging and de-aging transformations involving complex 3D modelling techniques. These methods are also prone to estimation errors in the synthesis. Another viable solution is to continuously adapt the template to the temporal variation (ageing) of the query data. Though efficacy of template update procedures has been proven for expression, lightning and pose variations, the use of template update for facial aging has not received much attention so far. Therefore, this paper first analyzes the performance of existing baseline facial representations, based on local features, under ageing effect then investigates the use of template update procedures for temporal variance due to the facial age progression process. Experimental results on FGNET and MORPH aging database using commercial VeriLook face recognition engine demonstrate that continuous template updating is an effective and simple way to adapt to variations due to the aging process.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 4; 43-255
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1384

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