Saltvandsforum.dk

nbd skrev:På scholar.google.com fandt jeg et abstract, som måske vil overbevise dig:

Phosphate uptake rates in Synechococcus R-2 in BG-11 media (a nitrate-based medium, not phosphate limited) were measured using cells grown semi-continuously and in continuous culture. Net uptake of phosphate is proportional to external concentration. Growing cells at pHo 10 have a net uptake rate of about 600 pmol m–2 s–1 phosphate, but the isotopic flux for 32P phosphate was about 4 nmol m–2 s–1. There appears to be a constitutive over-capacity for phosphate uptake. The Km and Vmax, of the saturable component were not significantly different at pHo 7.5 and 10, hence the transport system probably recognizes both H2PO–4and HPO2–4. The intracellular inorganic phosphate concentration is about 3 to 10 mol m–3, but there is an intracellular polyphosphate store of about 400 mol m–3. Intracellular inorganic phosphate is 25 to 50 kJ mol–1 from electrochemical equilibrium in both the light and dark and at pHo 7.5 and 10. Phosphate uptake is very slow in the dark ( 100 pmol m–2 s–1) and is light-activated (pHo 7.51.3 nmol m–2 s–1, pHo 10600 pmol m–2 s–1). Uptake has an irreversible requirement for Mg2+ in the medium. Uptake in the light is strongly Na+-dependent. Phosphate uptake was negatively electrogenic (net negative charge taken up when transporting phosphate) at pHo 7.5, but positively electrogenic at pHo 10. This seems to exclude a sodium motive force driven mechanism. An ATP-driven phosphate uptake mechanism needs to have a stoichiometry of one phosphate taken up per ATP (1 PO4 in/ATP) to be thermodynamically possible under all the conditions tested in the present study.
(kilde: Plant and Cell Physiology, 1997, Vol. 38, No. 11 1232-1241)


Der foreligger faktisk en del forskning, der påviser forskellige cyanobakteriers fosfatoptag. Problemet er bare, at forskningsartikler er sort snak for almindelige dødelige og at denne viden ikke kommer ud blandt f.eks. saltvandsakvarister.

Jeg er selv biolog og forsker, så jeg kan nogenlunde finde mening i disse skriverier

StarF skrev:

jim skrev:Jeg har ingen po4 i mit akvarie men jeg har cyreno så der behøver ikke være po4 i for det kan leve.

jim skrev:

StarF skrev:

jim skrev:Jeg har ingen po4 i mit akvarie men jeg har cyreno så der behøver ikke være po4 i for det kan leve.

Hvad tester du så po4 med? [/quote


Jeg har testet det med et salifert test sæt og Carsten fra decocean har også lige testet det med samme resluttat. Jeg ved ikke hvilken test han brugte.

DanielXavier skrev:

nbd skrev:På scholar.google.com fandt jeg et abstract, som måske vil overbevise dig:

Phosphate uptake rates in Synechococcus R-2 in BG-11 media (a nitrate-based medium, not phosphate limited) were measured using cells grown semi-continuously and in continuous culture. Net uptake of phosphate is proportional to external concentration. Growing cells at pHo 10 have a net uptake rate of about 600 pmol m–2 s–1 phosphate, but the isotopic flux for 32P phosphate was about 4 nmol m–2 s–1. There appears to be a constitutive over-capacity for phosphate uptake. The Km and Vmax, of the saturable component were not significantly different at pHo 7.5 and 10, hence the transport system probably recognizes both H2PO–4and HPO2–4. The intracellular inorganic phosphate concentration is about 3 to 10 mol m–3, but there is an intracellular polyphosphate store of about 400 mol m–3. Intracellular inorganic phosphate is 25 to 50 kJ mol–1 from electrochemical equilibrium in both the light and dark and at pHo 7.5 and 10. Phosphate uptake is very slow in the dark ( 100 pmol m–2 s–1) and is light-activated (pHo 7.51.3 nmol m–2 s–1, pHo 10600 pmol m–2 s–1). Uptake has an irreversible requirement for Mg2+ in the medium. Uptake in the light is strongly Na+-dependent. Phosphate uptake was negatively electrogenic (net negative charge taken up when transporting phosphate) at pHo 7.5, but positively electrogenic at pHo 10. This seems to exclude a sodium motive force driven mechanism. An ATP-driven phosphate uptake mechanism needs to have a stoichiometry of one phosphate taken up per ATP (1 PO4 in/ATP) to be thermodynamically possible under all the conditions tested in the present study.
(kilde: Plant and Cell Physiology, 1997, Vol. 38, No. 11 1232-1241)


Der foreligger faktisk en del forskning, der påviser forskellige cyanobakteriers fosfatoptag. Problemet er bare, at forskningsartikler er sort snak for almindelige dødelige og at denne viden ikke kommer ud blandt f.eks. saltvandsakvarister.

Jeg er selv biolog og forsker, så jeg kan nogenlunde finde mening i disse skriverier

Er du sindsyg en gang hønsesnak...

Men kan du forklare mig, hvor henne, og hvor ledes Cyano i en fotosyntese optager faste stoffer som fosfat

DanielXavier skrev:StarF

Kig ovenover dit indlæg, og sig så det samme en gang til.

DanielXavier skrev:
Er du sindsyg en gang hønsesnak...

Men kan du forklare mig, hvor henne, og hvor ledes Cyano i en fotosyntese optager faste stoffer som fosfat

Bingocaller skrev:Hvad tester de forresten for i Decocean - Klovnfisken = dem der tilbyder det - når man kommer derned med sit vand? Og betaler for det. Har ikke selv prøvet det