301 research outputs found
Effects of fertilizers, mulches and land contours on the growth of sea buckthorn cultivars in organic farming
The effects of different organic cultivation methods on the growth of two Finnish sea buckthorn was studied for two years
Rikkakasvien siementen mÀÀrÀ ja elinvoima erÀillÀ MTTK:n kiertokoealueilla : Kirjallisuustutkimus ja MTTK:n kolmen tutkimusaseman nÀytteiden analyysi
VokKirjasto Aj-
Study on morphological characteristics of the ladybird beetles (Coleoptera: Coccinellidae) and their host-plants posibility in Joensuu, Finland
The survey of the ladybird beetles population was conducted in Joensuu area, Finland, over a period of three years from mid-
May 2010 to mid-August 2013. All the specimens of the coccinellid ladybird beetles were collected from five major localities:
City centre, Linnunlahti, Karsikko, Utra and Pilkko areas. In the family Coccinellidae, 16 species belonging to 10 genera
were found in our experiment time. Most of ladybirdâs common hostâplant was Rosa rugosa and also other different species
of plants. All the host-plants were growing naturally in the local ecosystem of the experimental area. Out of the 16 species of
ladybird beetles from Joensuu, there were two species (Cryptolaemus montrouzieri and Chilocorus stigma) reported for the
first time from North Karelia and is therefore, a new addition to the ladybird beetles fauna of Finland
Polyphenol oxidase (PPO, catecholase) activity during germination and early seedling growth of Cicer milkvetch (Astragalus cicer L.)
Mature seeds of the legume Astragalus cicer L. form a homogeneous seed pool in size and weight. They occur either brown coloured or yellow coloured. They reveal an expressed dormancy but they germinate readily after mechanical scarification. Time span of germination and early seedling development under defined conditions were followed and compared to the activity and potential activation of polyphenol oxidase (PPO, catecholase). The yellow seeds developed without difficulties, but on the brown coloured seeds in the course of germination hyphal growth was visible which was linked with the death of the seedlings. Quantitative experiments with the yellow seeds revealed that scarified seeds formed more than 98 % of seedlings within seven days. There was no difference of germination rate between dark and daylight incubations. The polyphenol oxidase of the seeds occurs in two forms, a preformed testa localized enzyme and an induced PPO activity of the seedling. The initially high activity of the testa related PPO (1.32 ÎŒM O2/h x g fresh weight) decreases during the first days after germination, the activity of the seedling related PPO becomes detectable four to five days after onset of germination. After seven days the activity in roots is about 3.6 ÎŒM O2/h x g fresh weight. The cotyledons reveal 2.3 and the hypocotyl 1.9 ÎŒM O2/h x g fresh weight, respectively.There is an indication that autoinhibitory components interfere with the germination process. The importance of the polyphenol oxidase as a component of the plantsâ protection system during germination is discussed
Kylvöajan vaikutus lupiinin (Lupinus angustifolius L.) siemensatoon Keski- ja Pohjois-Suomessa
VokLoppuunmyyt
Planar Jet Stripping of Liquid Coatings: Numerical Studies
In this paper, we present a detailed example of numerical study of flm
formation in the context of metal coating. Subsequently we simulate wiping of
the film by a planar jet. The simulations have been performed using Basilisk, a
grid-adapting, strongly optimized code. Mesh adaptation allows for arbitrary
precision in relevant regions such as the contact line or the liquid-air impact
zone, while coarse grid is applied elsewhere. This, as the results indicate, is
the only realistic approach for a numerical method to cover the wide range of
necessary scales from the predicted film thickness (tens of microns) to the
domain size (meters). The results suggest assumptions of laminar flow inside
the film are not justified for heavy coats (liquid zinc). As for the wiping,
our simulations supply a great amount of instantaneous results concerning
initial film atomization as well as film thickness.Comment: 20 pages, 20 figure
- âŠ