Wyniki wyszukiwania

1

Pióra ptaków - od archeologii do biotechnologii

100%

Pawlak M.

Polskie Drobiarstwo

|

2014

|

tom 21

|

nr 06

2

Fenomen piór i pierzenia

88%

Kruszewicz A. G.

Ptaki. Biuletyn Ogólnopolskiego Towarzystwa Ochrony Ptaków

|

2010

|

nr 3

3

Birds as bioindicators of heavy metal pollution: review and examples concerning European species

88%

Dmowski K.

Acta Ornithologica

|

1999

|

tom 34

|

nr 1

1-25

The following species of sedentary birds with widespread and common occurrence are the most convenient as bioindicators: Magpie Pica pica, Feral Pigeon Columba livia f. domestica, House Sparrow Passer domesticus or Tree Sparrow Passer montanus, Blackbird Turdus merula, Goshawk Accipiter gentilis (feathers) and nestlings of various species. The non-destructive method of feather analysis is suitable mainly for assessment of Pb, Cd, As, Sb, Ge, Tl, and Hg. It cannot be applied for Mn, Ni, Sr, Rb, Mo and Fe that are cumulated in feathers at similar levels in polluted and unpolluted areas. Hg, Zn, Cu, Cr, As and Se have stronger affinity to keratin than others. The method requires strict standardisation, particularly in the way samples are to be collected and prepared for mineralisation. None of feather cleaning procedures removes all contaminants from vane surfaces. With respect to many elements, analysing "concentration in feathers" is a measurement of external deposition therefore metal levels found in feathers correspond more strongly to the data on immission than to the element pool available in food. Mercury is an exception here. In cases of toxic elements as Pb, Cd or Tl it is possible to predict their concentrations in internal tissues on the basis of feather analysis.

4

Feather morphology at the ultrastructural level

88%

Dyck J.

Acta Ornithologica

|

1999

|

tom 34

|

nr 2

131-134

The usefulness of transmission and scanning electron microscopy for clarifying the finer details of feather morphology is exemplified. (1) The structure making a wing feather airtight is a ventral, membraneous extension of a barbule closing the gap between adjacent barbules. (2) The exposed part of the body plumage is a very open structure. This fact and the shape of barbules in transverse section suggest that water repellency is an important function of body plumage. (3) Two ways of producing colours resembling those of green vegetation by utilizing yellow carotenoids, blackish melanins, air and keratin are contrasted: a simple one in olive green feathers and a complex one in green feathers of Ptilinopus doves.

5

Antybiotyki w piórach kurzych jako potencjalne źródło zanieczyszczenia pasz

88%

Gajda A., Nowacka -Kozak E., Gbylik-Sikorska M., Piątkowska M., Posyniak A.

Pasze Przemysłowe

|

2018

|

tom 27

|

nr 2

6

Kolekcjonowanie ptakow, jaj i pior a prawo

88%

Dolata P. T.

Ptaki. Biuletyn Ogólnopolskiego Towarzystwa Ochrony Ptaków

|

1999

|

nr 1

17-19

7

Skąd się wzięły pióra ptaków? - przegląd hipotez

75%

Sabath K.

Przegląd Zoologiczny

|

1990

|

tom 34

|

nr 1

8

Różnorodność upierzenia u ptaków domowych, cz.I

75%

Matuszewski A., Lukasiewicz M., Wnuk-Gnich A., Wardecki L., Florczuk-Kolomyja P.

Polskie Drobiarstwo

|

2018

|

nr 10

9

The mechanism of feather movements: implications for the evolution of birds and avian flight

75%

Homberger D. G.

Acta Ornithologica

|

1999

|

tom 34

|

nr 2

135-140

The feather-bearing skin of birds differs fundamentally from the fur-bearing skin of mammals. Especially within the feather tracts, it contains much structural fat tissue in the dermis and the subcutaneous Fascia superficialis. These are separated from each other by an elastic membrane and are, together with the feather muscles, part of the hydraulic skeleto-muscular apparatus of the feathers. While feathers are raised by erector feather muscles and are returned to their resting position by the resilience of the surrounding fat tissue and an elastic membrane, the depressor feather muscles counteract external forces, such as air turbulences, thereby ensuring a smooth surface of the coat of feathers and reducing drag during flight. The coat of feathers itself creates fusiform body contours, which also reduce drag. Furthermore, subcutaneous fat bodies are strategically placed to ensure an even draping of the skin over the body and, thereby, contribute to streamlined body contours. The subcutaneous fat bodies and the dermal depressor muscles are part of the unique characteristics of the avian integument and have evolved under the selective regime for streamlining of body contours and surface as a precondition for the evolution of avian flight.

10

Dzikie gęsi, gęsi domowe - ich fenomen

75%

Poprawa E., Graff J.

Aura

|

2011

|

nr 01 Dodatek Ekologiczny dla Szkół nr 196

11

Zawartość rtęci w piórach pisklęcia bielika (Haliaeetus albicilla)

75%

Falandysz J., Mizera T.

Notatki Ornitologiczne

|

1989

|

tom 30

|

nr 3-4

12

Piora ptasie jako biowskazniki skazenia srodowiska przyrodniczego zwiazkami rteci

75%

Chyla M. A.

Przegląd Zoologiczny

|

2000

|

tom 44

|

nr 1-2

29-41

13

Uzupełnienia do nazewnictwa morfologicznego piór

75%

Kruszewicz A. G.

Notatki Ornitologiczne

|

1991

|

tom 32

|

nr 3-4

14

Zawartosc olowiu w tkankach i piorach smieszek Larus ridibundus gniazdujacych na Zbiorniku Mietkowskim

63%

Orlowski G., Polechonski R., Dobicki W., Zawada Z.

Notatki Ornitologiczne

|

2005

|

tom 46

|

nr 4

231-240

15

Co było pierwsze: pióro czy ptak?

63%

Prum R. O., Brush A. H.

Świat Nauki

|

2003

|

nr 05

16

Ornitogeniczny material diagnostyczny. Czy w Polsce wystepuja gleby 'ornithic'?

63%

Ligeza S.

Roczniki Gleboznawcze

|

2010

|

tom 61

|

nr 1

60-66

17

Upierzenie kur bażantów łownych

63%

Mroz E., Stepinska M.

Polskie Drobiarstwo

|

2012

|

tom 19

|

nr 01

18

Dobre upierzenie wspomaga optymalizację wykorzystania energii

63%

Hardiman J., Katanbaf M.

Polskie Drobiarstwo

|

2012

|

tom 20

|

nr 11

19

Pregi stresowe na lotkach sow jarzebatych Surnia ulula

63%

Cieslak M., Kwiecinski Z.

Notatki Ornitologiczne

|

2005

|

tom 46

|

nr 3

194-198

20

Grzyby w upierzeniu i gniazdach ptakow

63%

Pinowski J., Pinowska B., Haman A.

Wiadomości Botaniczne

|

1999

|

tom 43

|

nr 3-4

31-39

Ograniczanie wyników

Pióra ptaków - od archeologii do biotechnologii

Fenomen piór i pierzenia

Birds as bioindicators of heavy metal pollution: review and examples concerning European species

Feather morphology at the ultrastructural level

Antybiotyki w piórach kurzych jako potencjalne źródło zanieczyszczenia pasz

Kolekcjonowanie ptakow, jaj i pior a prawo

Skąd się wzięły pióra ptaków? - przegląd hipotez

Różnorodność upierzenia u ptaków domowych, cz.I

The mechanism of feather movements: implications for the evolution of birds and avian flight

Dzikie gęsi, gęsi domowe - ich fenomen

Zawartość rtęci w piórach pisklęcia bielika (Haliaeetus albicilla)

Piora ptasie jako biowskazniki skazenia srodowiska przyrodniczego zwiazkami rteci