Μπλεξαμε σε περιπετειες...!!

[Γιώργος Κ]

Αρχική Δημοσίευση από alex

τα ξερω μωρε
Nitrosomonas και Nitrobacter...
αποτι φαινεται στα πρωτα ειμαι καλα αλλα τα νιτροβακτηριδια μαλλον εχουν το προβλημα...απο την αλλη σκεφτομαι πως γινεται να παραγουν 25mg no3
και οχι οσο χρειαζεται/υπαρχει? κουρδισμενα ειναι?
επηρεαζονται απο το ph? δεν εχω μετρησει ποτε...

Συμφωνα με πολλες μελετες τα βακτηρια επηρεαζονται απο το ph αλλα και απο τη θερμοκρασια! Το ψαχνω μια που εμενα το ph ειναι παρα παρα πολυ χαμηλο! Ψαχνωντας βρηκα αυτο:

Nitrifying bacteria have long generation times due to the low energy
yield from their oxidation reactions. Since little energy is produced
from these reactions they have evolved to become extremely efficient at
converting ammonia and nitrite. Scientific studies have shown that
Nitrosomonas bacterium are so efficient that a single cell can convert
ammonia at a rate that would require up to one million heterotrophs to
accomplish. Most of their energy production (80%) is devoted to fixing
CO2 via the Calvin cycle and little energy remains for growth and
reproduction. As a consequence, they have a very slow reproductive rate.

Nitrifying bacteria reproduce by binary division. Under optimal
conditions, Nitrosomonas may double every 7 hours and Nitrobacter every
13 hours. More realistically, they will double every 15-20 hours. This
is an extremely long time considering that heterotrophic bacteria can
double in as short a time as 20 minutes. In the time that it takes a
single Nitrosomonas cell to double in population, a single E. Coli
bacterium would have produced a population exceeding 35 trillion cells.

None of the Nitrobacteraceae are able to form spores. They have a
complex cytomembrane (cell wall) that is surrounded by a slime matrix.
All species have limited tolerance ranges and are individually sensitive
to pH, dissolved oxygen levels, salt, temperature, and inhibitory
chemicals. Unlike species of heterotrophic bacteria, they cannot survive
any drying process without killing the organism. In water, they can
survive short periods of adverse conditions by utilizing stored
materials within the cell. When these materials are depleted, the
bacteria die.

*Temperature*

The temperature for optimum growth of nitrifying bacteria is between
77-86° F (25-30° C).

Growth rate is decreased by 50% at 64° F (18° C).

Growth rate is decreased by 75% at 46-50° F.

No activity will occur at 39° F (4° C)

Nitrifying bacteria will die at 32° F (0° C).

Nitrifying bacteria will die at 120° F (49° C)

Nitrobacter is less tolerant of low temperatures than Nitrosomonas. In
cold water systems, care must be taken to monitor the accumulation of
nitrites.

*pH*

The optimum pH range for Nitrosomonas is between 7.8-8.0.

The optimum pH range for Nitrobacter is between 7.3-7.5

Nitrobacter will grow more slowly at the high pH levels typical of
marine aquaria and preferred by African Rift Lake Cichlids. Initial high
nitrite concentrations may exist. At pH levels below 7.0, Nitrosomonas
will grow more slowly and increases in ammonia may become evident.
Nitrosomonas growth is inhibited at a pH of 6.5. All nitrification is
inhibited if the pH drops to 6.0 or less. Care must be taken to monitor
ammonia if the pH begins to drop close to 6.5. At this pH almost all of
the ammonia present in the water will be in the mildly toxic, ionized
NH_3 ^+ state.

Συμφωνα με τα παραπανω .. Σε χαμηλα και υψηλα ph τα βακτηρια σταματουν την λειτουργια τους η και πεθαινουν κιολας! Δε το εχω επαληθευσει αφου σε μενα λειτουργει ο κυκλος μια χαρα και ας εχω ph 4,80 - 5,5 ... ισως παιζει ρολο και η θερμοκρασια ... Θα ανοιξω θεμα οταν μαζεψω ολες τις πληροφοριες που προερχονται απο επιστημονικες μελετες αλλα και τις παρατηρησεις (μετρησεις) ολων μας ...

Οσο για τις τιμες των ενυδρειακων ... εχεις πιασει το νοημα! Αλλα το ενυδρειακο αλατι πιστευω το βρισκεις φτηνα σε πετσοπ ...