Abstract
Abstract The linear uptake of zinc by excised barley roots ( Hordeum distichon L.) in the time range from 20–120 min is not continued over periods of 20–28 h. In concentration dependent uptake experiments with intact barley roots three phases in the range up to 1.38 m M zinc could be detected independent of the tested uptake period. The kinetic constants increased with higher phases and the transition points were lowered with increasing time. The presence of copper did not inhibit the uptake of zinc competitively. On the contrary a slight stimulation in the uptake rates was observed indicating an interaction with the transition site. It is concluded that zinc and copper are taken up by separate mechanisms.
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Claims 7
Claim · model-written summary
Linear zinc uptake by excised barley roots over 20–120 minutes did not persist over 20–28 hours.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaret0 - Organ / stage
- excised barley rootse0
- Outcome
- uptake of zince0
- Qualifier
- in the time range from 20–120 min is not continued over periods of 20–28 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Barley Roots”
e0“The linear uptake of zinc by excised barley roots ( Hordeum distichon L.) in the time range from 20–120 min is not continued over periods of 20–28 h”
Claim · model-written summary
Zinc uptake by intact barley roots had three concentration-dependent phases up to 1.38 m M zinc across tested uptake periods.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- intact barley rootse0
- Outcome
- three phasese0
- Value
- 1.38 m M zince0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley Roots”
e0“In concentration dependent uptake experiments with intact barley roots three phases in the range up to 1.38 m M zinc could be detected independent of the tested uptake period”
Claim · model-written summary
Kinetic constants increased in higher uptake phases.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- Barley Rootst0
- Outcome
- kinetic constantse0
- Direction
- increasede0
- Qualifier
- higher phasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley Roots”
e0“The kinetic constants increased with higher phases”
Claim · model-written summary
Transition points declined as uptake time increased.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- Barley Rootst0
- Outcome
- transition pointse0
- Direction
- lowerede0
- Qualifier
- increasing timee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley Roots”
e0“the transition points were lowered with increasing time”
Claim · model-written summary
Copper did not competitively inhibit zinc uptake by barley roots.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- presence of coppere0
- Outcome
- uptake of zince0
- Direction
- did not inhibite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley Roots”
e0“The presence of copper did not inhibit the uptake of zinc competitively”
Claim · model-written summary
Copper slightly stimulated zinc uptake rates.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- uptake ratese0
- Direction
- stimulatione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley Roots”
e0“a slight stimulation in the uptake rates was observed”
Claim · model-written summary
The authors concluded that zinc and copper use separate uptake mechanisms.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- zinc and copper are taken up by separate mechanismse0
- Qualifier
- separate mechanismse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Barley Roots”
e0“It is concluded that zinc and copper are taken up by separate mechanisms”
The same questions in other papers
copper atom · nutrient: content · Hordeum vulgare (barley)Positive and negative results
4 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.