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| Articles
by
Zorica VOSGAN |
Total Records (
4 ) for
Zorica VOSGAN |
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Lucia MIHALESCU
,
Oana MARE ROSCA
,
Monica MARIAN
,
Zorica VOSGAN
,
Aurel MAXIM
and
Mirela CORDEA
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In this paper the influence of iron in different concentrations of FeCl3 solution on
the respiration of corn (Zea mays) seedlings was observed. The following variants were used: V1 — as
control, V2 = 0.1%FeCl3, V3 = 0.5%FeCl3, V4= 1%FeCl3. The respiration intensity of the 4 variants
was determined applying the confined atmosphere procedure (Boysen-Jensen). This is a method based
on determining the quantity of produced CO2. In case of this procedure, the contact between vegetal
material and atmosphere takes place in a closed recipient, in which CO2 - resulted from respiration —
is fixed by a solution of Ba(OH)2. An increase of the respiration intensity was noted, proportional with
the increase of the administered FeCl3 solution concentration. Iron ion enters in the structure of
cytochromes, which are components of the respiratory chain. Its presence in the growing environment
of the corn seedlings led to the respiration increase. The intensity increase quickly evolves with low
concentrations of iron, for example the variant with a concentration of 0.1% salt of FeCl3, for which it
increased with 184% compared to the control, as the increase intensifies at concentrations of 0.5%
with 259%. We note that in the last case, when iron is in the highest concentration of 1%FeCl3, the
increase is no more so heightened, as it is higher with only 128% versus the previous variant. Iron
highly stimulates the respiration up to a certain concentration, it was remarked. |
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Zorica VOSGAN
,
Roxana VIDICAN
,
Stela JELEA
,
Monica MARIAN
,
Lucia MIHALESCU
and
Oana MARE ROSCA
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This study has been carried out in a pastoral area of Maramures County, on the
south-estic slope of Gutai Mountain, where it is situated the pasture for the ovines and caprines of the
inhabitants of the surrounding villages.
It has been identified in this area a districambosol soil characterized by high acidity, a
composition rich in nitrogen and humus due to slow humification, moderate reserves of potassium and
phosphor. The assay indicates a clayey composition except for the At horizon which has a composition
predominant in fine sand.
In order to increase the value of the pasture, improvement and maintainance works should be
performed. |
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Lucia MIHALESCU
,
Oana MARE ROSCA
,
Monica MARIAN
,
Zorica VOSGAN
,
Aurel MAXIM
and
Mirela CORDEA
|
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Possible influence of lead on germination was studied, in the carried out
experiences. The corn caryopses were soaked in solutions of PbCl2 of different concentrations, for 2
hours. For each variant 30 caryopses were used; they were put into germinators where they were
wetted with the corresponding solutions. It was noted that lead, in small quantities, produces the
stimulation of germination of about 10-20%, and in high quantities a decrease with 66% due to the
inhibition of cells division and cells elongation, too. |
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Zorica VOSGAN
,
Roxana VIDICAN
,
Monica MARIAN
,
Lucia MIHALESCU
,
Stela JELEA
and
Oana MARE ROSCA
|
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This study aims to investigate and identify plant species on the village common grazing
Surdesti, located at 760 m altitude in the foothills south west of Gutai Mountains in northwestern
Romania. Green growth of plants and animals is the main activity of the inhabitants of this area and
food production is made using environmentally friendly technologies and natural life cycle of the
ecosystem. It is important to know the qualitative composition of grassland vegetation as the main
source of feed for cattle, sheep, goats. |
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