Wyniki wyszukiwania

1

Glycogen distribution in porcine Fallopian tube epithelium during the estrus cycle

100%

Gregoraszczuk E. L., Cala M., Witkowska E.

Folia Biologica

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2000

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tom 48

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nr 3-4

2

The effect of variable environmental conditions on dimensional changes in thin wood-based materials. Part I. Absorption changes

84%

Mirski R.

Electronic Journal of Polish Agricultural Universities. Series Wood Technology

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2009

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tom 12

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nr 4

3

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Characteristics of soil-peat-rubble mixtures by mercury intrusion porosimetry

84%

Hajnos M., Bowanko G.

International Agrophysics

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2002

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tom 16

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nr 3

4

Cyclic changes in gonadal maturation and histological observations of threatened freshwater catfish 'narikeliru' Mystus montanus [Jerdon, 1849]

84%

Arockiaraj A. J., Haniffa M. A., Seetharaman S., Singh S.

Acta Ichthyologica et Piscatoria

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2004

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tom 34

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nr 2

Background. Usage of biosciences in increasing fish production needs to have a proper understanding and knowledge of endocrine physiology of fish reproduction. The most suitable method of determining the reproductive cycle in fishes is to observe seasonal development changes in the gonads. The present paper describes morphological changes in gonads of Mystus montanus. Materials and Methods. The individuals of M. montanus were sampled monthly in captive condition throughout one year to determine the changes occurring in gonadal histology and reproductive status. The stages of gonadal maturation and the seasonal changes in the proportion of oocyte development within the ovaries were noticed and maturity stages were assessed by microscopic and also macroscopic observations. Results. The peak spawning period of Mystus montanus was noticed during November-January in male and October-December in female. The size at first maturity was 10-11 cm (8-12 g) in male and 13-14 cm (14-16 g) in female, respectively. M. montanus spawned only once in a year with the onset of north-east monsoon. The gonadosomatic index (GSI) ranged from 2.8 to 8.5 in males and from 4 to 16 in females and their condition factor (CF) was 4-6 and 6-9, respectively. Conclusion. The sequence of gonadal maturation in M. montanus is morphologically and histologically divided into five stages viz. immature, maturing, mature, matured, and spent or rest.

5

Cyclic changes in tree species composition of mixed-species forest in Western Carpathians: role of disturbance and tree regeneration

67%

Saniga M., Balanda M., Kucbel S., Jaloviar P.

Polish Journal of Ecology

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2011

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tom 59

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nr 4

The paper presents results acquired by an analysis of stand structure, regeneration processes and disturbance regime of a mixed natural forest located in the Carpathians (Central Slovakia). The data were collected on two permanent research plots located on different geological bedrocks (andesite and migmatites). Significant differences in the composition of the upper tree layer were observed among two types of geological bedrock. On the plot I (andesite), European ash (Fraxinus excelsior L.) occurred as a dominant component. An opposite situation was observed on the plot II (migmatites). The coexistence of beech (Fagus sylvatica L., spruce (Picea abies L. Karst.) and ash was recorded in the upper layer. The middle and lower layers were almost identical on both types of bedrock. The dominance of beech with the admixture of other tree species was observed. Regarding the structure of the present forest stand in relation to the structure of the gapmakers and natural regeneration, we observed a partial cyclical alternation of the tree species composition of this natural forest within the time span of several developmental cycles. The analysis of natural regeneration implied a crucial role of ungulates for the growth enforcement of ash individuals in the next generation of natural forest. Under the current condition, a negative trend in tree species diversity of the future generation of natural forest towards the dominance of beech was found.

6

An analysis of power effectiveness of speed profile in view of driving acceleration in urban means of transport, using SAS system

67%

Burski Z.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

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2007

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tom 07A

7

Annual growth sequences and solar activity cycles [examples from subfossil oaks from Southern Poland]

67%

Krawczyk A. J., Krapiec M.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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2003

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tom 51

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nr 1

8

Wpływ cyklicznego zamrażania-rozmrażania na wytrzymałość na przebicie geosyntetyków

59%

Cholewa M., Steczko M., Zawisza E.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2008

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tom 532

W artykule przedstawiono wyniki badań wytrzymałości na przebicie geosyntetyków osłonowych i uszczelniających. Jako materiały osłonowe wybrano cztery typy geowłóknin o różnej grubości i gramaturze, materiały uszczelniające reprezentowane były przez trzy typy geomembran o różnej grubości. Badania wykonano oddzielnie dla geowłóknin i geomembran oraz dla utworzonych z nich geokompozytów (geomembrany w osłonie z geowłóknin) - przed i po 28 cyklach zamrażania w temperaturze -24°C i rozmrażania w wodzie o temperaturze +18°C. Badania prowadzone były zgodnie z normą PN-EN 14574:2006. Wyniki badań wykazały, że geomembrany odznaczają się 2-5-krotnie większą wytrzymałością na przebicie niż geowłókniny. Geokompozyty wykazały wytrzymałość na przebicie wielokrotnie większą (2-6-krotnie w zależności od układu) od wytrzymałości poszczególnych geosyntetyków. Świadczy to, że stosowanie warstwy ochronnej z geowłókniny przy geomembranie jest skutecznym sposobem zwiększenia jej odporności na uszkodzenie mechaniczne. Zarówno geowłókniny, jak i geomembrany, a także utworzone z nich geokompozyty wykazały dużą mrozoodporność.

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