Temat: yield factor - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Effects of dietary crude protein on slaughter yield of selected broiler stocks
Autorzy:: Melo, J E
Miquel, M.C.
Mallo, G.
Ciacciariello, M.
Villar, E.
Tematy:: selection level
genetics
slaughter yield
broiler strain
commercial strain
environmental factor
dietary protein
body composition
protein content; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2043626.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Dependence of the photosynthesis quantum yield in oceans on environmental factors
Autorzy:: Wozniak, B.
Dera, J.
Ficek, D.
Ostrowska, M.
Majchrowski, R.
Tematy:: primary production
water temperature
quantum yield
environmental factor
bio-optical modelling
nutrient content
phytoplankton
chlorophyll
irradiance
photosynthesis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/48279.pdf Link otwiera się w nowym oknie
Opis:: Statistical relationships between the quantum yield of photosynthesis and selected environmental factors in the ocean have been studied. The underwater irradiance, nutrient content, water temperature and water trophicity (i.e. the surface concentration of chlorophyll Ca(0)) have been considered, utilizing a large empirical data base. On the basis of these relationships, a mathematical model of the quantum yield was worked out in which the quantum yield Φ is expressed as a product of the theoretical maximum quantum yield ΦMAX = 0.125 atomC quanta−1 and six dimensionless factors. Each of these factors fi appears to be, to a sufficiently good approximation, dependent on one or two environmental factors and optical depth at most. The model makes it possible to determine the quantum yield from known values of these environmental factors. Empirical verification of the model yielded a positive result – the statistical error of the approximate values of the quantum yield Φ is 42%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The effect of temperature and humidity on the grazing activity of Deroceras reticulatum (O. F. Muller, 1774) and the damage to rape plants
Autorzy:: Kozlowski, J.
Jaskulska, M.
Kaluski, T.
Kozlowska, M.
Tematy:: temperature effect
humidity
grazing activity
Deroceras reticulatum
damage
rape plant
winter rape
slug
yield loss
environmental factor
air temperature; Pokaż więcej
Wydawca:: Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Powiązania:: https://bibliotekanauki.pl/articles/83902.pdf Link otwiera się w nowym oknie
Opis:: Winter rape is susceptible to damage caused by D. reticulatum (O. F. Müller) mainly in the early phases of the plants’ development. The degree of damage and the size of yield losses depend on the slug population and the grazing activity, which are governed by many environmental factors. Laboratory studies were performed to analyse the rate and amount of damage to rape plants (2–3 leaf stage) caused by D. reticulatum, and the effect of temperature and soil humidity on the slug’s grazing activity. With increasing air temperature (up to 16°C) the amount of damage increased, but the effect was not lasting. The slugs were also active at low temperatures (+1°C), and although their grazing was less intense, the amount of damage after seven days could reach an average of 34%. In laboratory tests, the soil humidity had no marked effect on the amount of damage done by the slugs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Variability of the portion of functional PS2 reaction centres in the light of a fluorometric study
Autorzy:: Ficek, D.
Ostrowska, M.
Kuzio, M.
Pogosyan, S.I.
Tematy:: marine phytoplankton
variability
quantum yield
chlorophyll a
optical depth
PS2 reaction
environmental factor
photosynthetic apparatus
sea
fluorometric method
light
photosynthesis; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/48365.pdf Link otwiera się w nowym oknie
Opis:: The paper contains a preliminary analysis of the links between the portion fc of functional PS2 reaction centres in the photosynthetic apparatus of marine phytoplankton and environmental factors. The analysis is based inter alia on fluorometric measurements of fc (see Kolber & Falkowski 1993) in water sampled from different depths and trophic types of sea. From the statistical generalisations was derived an analytical form of the relationship between fc, and the optical depth and trophic type of sea (the trophicity index was taken to be the surface concentration of chlorophyll a). According to this relationship, fc rises as the trophicity of the sea does so. Moreover, there is a certain optimal optical depth for each type of water at which the number of functional PS2 reaction centres reaches a maximum. Above or below this depth the value of fc falls. At the present stage of investigations it seems reasonable to assume that this drop in the number of functional PS2 reaction centres close to the surface is due to the destructive effect of excessive irradiance. On the other hand, their reduced number at greater depths, below the fc maximum, can be attributed to the deficit of light and the consequent destruction of reaction centres.
Dostawca treści:: Biblioteka Nauki

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