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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
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Petri Question
#22321326 - 10/01/15 09:32 PM (8 years, 3 months ago) |
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Is there a better alternative to parafilm, or is this information still legit? I want to get some petris very soon.
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
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It doesn't go over the vents, right? Should I put micropore tape over the vents? Do I need both?
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
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You need vented. Just wrap with saran.
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YaMoonSun
The Double Standard


Registered: 10/23/14
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
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Loc: Canada
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Ummm no. Not only is that a ripoff, there is no guarantee how well those were prepared or if the agar was even properly sterilized. Do things yourself and be confident they were done right.
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YaMoonSun
The Double Standard


Registered: 10/23/14
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They seem to have pretty decent reviews, but okay, you're more than likely right. I need to get a ton of supplies still then
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micro
bunbun has a gungun



Registered: 05/09/03
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Loc: Brick City
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Well, if it weren't sterile it would probably be culturing something by now, but it looks like LB media which is going to be preferential to bacteria anyway. I agree -- you're much better doing this yourself and using media that is specific to fungi, esp. basidiomycetes / dung lovers.
OP, if you are asking about parafilm, it is what they use in biological laboratories but we always threw the petris back in their sleeve and stored it in the walk-in fridge. I don't remember ever using that to culture them. Not sure if it is oxygen/co2 that is the reason; the dishes are often left upside-down and shut anyway, but I figured I'd mention it, for what it is worth.
(if I had to guess I'd say doesn't matter when culturing, but wrap it up to store)
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
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Re: Petri Question [Re: micro]
#22321544 - 10/01/15 10:42 PM (8 years, 3 months ago) |
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It's likely because of co2 being heavier, it just falls out of the petri as after the mold/fungi produces it, thanks for the response. Good tip.
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cronicr



Registered: 08/07/11
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co2 does not fall
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Mad Season
hookers and blackjack



Registered: 09/16/12
Posts: 12,666
Loc: Canada
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Re: Petri Question [Re: cronicr]
#22322046 - 10/02/15 02:19 AM (8 years, 3 months ago) |
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U sure bro?!? I've seen it fall with my own 2 eyes son!
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YaMoonSun
The Double Standard


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Re: Petri Question [Re: cronicr]
#22323061 - 10/02/15 10:58 AM (8 years, 3 months ago) |
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Why wouldn't it if it's heavier than oxygen? Too much free air exchange mixing the co2 and oxygen up?
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Mad Season
hookers and blackjack



Registered: 09/16/12
Posts: 12,666
Loc: Canada
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It's all these damn air pressures and currents! The world isn't a vacuum. Co2 and o2 would split if it was a vacuum.. Void of all air and currents.
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taGyo
Strainiac/AMU



Registered: 10/16/14
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CO2 and O2 mix together. It's not an oil and water kind of deal.
-------------------- Gyo's Better Grows TNF Q&A AMU Q&A Dominus fortunae meae sum
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
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Re: Petri Question [Re: taGyo]
#22323249 - 10/02/15 11:43 AM (8 years, 3 months ago) |
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So those mycelium bags people put in their cannabis grow rooms to replace co2 tanks don't actually need to be elevated? Damn pot-heads. 
Just for the record, and I know it may sound stupid, but I don't cover the vents with the saran, only the sides of the petris, correct?
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aerow.thefox
professional amatuer



Registered: 06/10/10
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Re: Petri Question [Re: taGyo]
#22323259 - 10/02/15 11:47 AM (8 years, 3 months ago) |
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Quote:
taGyo said: CO2 and O2 mix together. It's not an oil and water kind of deal.
im not sure im entirerly sure thats accurate. do they mix well and stay mixed in a normal enviroment? yea of course.
but they DO have different masses. and BOTH are gasses influenced by fluid dynamics. i would imagine if all gasses were trapped inside an air-tight container, with an even temperature throughout, the would naturally seperate into layers of gasses. with the most dense at bottom and least at top. without temperature or physical interaction causing disturbances in a material so easily moved... just my opinion.
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taGyo
Strainiac/AMU



Registered: 10/16/14
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Yeah, in a hypothetical world with hypothetical exacts they may or may not segregate themselves based on density and other variables. I haven't done enough research to tell you.
But in an SGFC, Petri or Mono the CO2 isn't simply on one level of the SGFC, it's mixed with the oxygen.
-------------------- Gyo's Better Grows TNF Q&A AMU Q&A Dominus fortunae meae sum
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
Posts: 37,810
Loc: Canada
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Re: Petri Question [Re: taGyo]
#22323567 - 10/02/15 12:46 PM (8 years, 3 months ago) |
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Not to mention heat currents being formed by the mycelium.
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aerow.thefox
professional amatuer



Registered: 06/10/10
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exactly my point. in a normal enviroment they mix up just fine. too many variables. but they CAN seperate
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
Posts: 37,810
Loc: Canada
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CO2 can fall real fast real hard. I dropped a CO2 tank on my toe once and lost the nail
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tripdawg420
low life with no life



Registered: 02/02/09
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aerow.thefox
professional amatuer



Registered: 06/10/10
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ouch!
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taGyo
Strainiac/AMU



Registered: 10/16/14
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Quote:
Pastywhyte said: CO2 can fall real fast real hard. I dropped a CO2 tank on my toe once and lost the nail 
-------------------- Gyo's Better Grows TNF Q&A AMU Q&A Dominus fortunae meae sum
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micro
bunbun has a gungun



Registered: 05/09/03
Posts: 7,532
Loc: Brick City
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Quote:
aerow.thefox said: im not sure im entirerly sure thats accurate. do they mix well and stay mixed in a normal enviroment? yea of course.
but they DO have different masses. and BOTH are gasses influenced by fluid dynamics. i would imagine if all gasses were trapped inside an air-tight container, with an even temperature throughout, the would naturally seperate into layers of gasses. with the most dense at bottom and least at top. without temperature or physical interaction causing disturbances in a material so easily moved... just my opinion. 
They would both take the shape of the container and would ideally be evenly dispersed. I say 'ideally' because nothing is ever 100% even. Think of it like a bunch of balls rolling around on a floor. You are projecting the 3D space to a 2D plane, and for simplicity's sake imagine they never stop. They would bounce around constantly hitting into each other from all directions. It's the same with two liquids in solution. You could put it in a centrifuge and it wont separate; if it does it was a suspention.
The reason people store petris upside-down is mostly so humidity doesn't cloud up the top.
As for "vents" I'm not sure what you mean; the only part of a petri dish you should need to seal is around the edges. Just take the parafilm and wrap it a few times around the edges, tightening it a bit (but not so much it will break).
-------------------- Any research paper or book for free (Avatar is Maxxy, a character by Mizzyam, RIP)
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taGyo
Strainiac/AMU



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Re: Petri Question [Re: micro]
#22323822 - 10/02/15 01:39 PM (8 years, 3 months ago) |
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Honestly I just deal with it , eventually the condensation (Not humidity) disperses as both temperatures reach equilibrium. Or it doesn't , regardless I can spot myc.
-------------------- Gyo's Better Grows TNF Q&A AMU Q&A Dominus fortunae meae sum
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micro
bunbun has a gungun



Registered: 05/09/03
Posts: 7,532
Loc: Brick City
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Re: Petri Question [Re: taGyo]
#22323830 - 10/02/15 01:41 PM (8 years, 3 months ago) |
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yeah, it's not a necessity
-------------------- Any research paper or book for free (Avatar is Maxxy, a character by Mizzyam, RIP)
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
Posts: 37,810
Loc: Canada
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Re: Petri Question [Re: micro]
#22323988 - 10/02/15 02:21 PM (8 years, 3 months ago) |
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Vented petri dishes have little raised sections on the rim of the bottom plate. This keeps the lid from sealing to the lower dish and forming and anerobic environment. Its so standard its often not even mentioned.
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YaMoonSun
The Double Standard


Registered: 10/23/14
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Well if heat rises and the petri dishes are upside down, wont the heat just be pushing the already falling co2 out of the dishes?
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
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Loc: Canada
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A culture on a plate isn't going to generate a whole lot of heat. Actually is not going to consume a whole lot of O2 or produce a large amount of CO2 either. But as was said earlier most of that will be a mix. It would be like dropping some dye in a tub of water and trying to push that to one side.
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taGyo
Strainiac/AMU



Registered: 10/16/14
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Great analogy, I think that paints the picture perfectly
-------------------- Gyo's Better Grows TNF Q&A AMU Q&A Dominus fortunae meae sum
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
Loc: NY
Last seen: 5 months, 11 days
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Re: Petri Question [Re: taGyo]
#22324502 - 10/02/15 04:15 PM (8 years, 3 months ago) |
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Well shit, okay.  I still think the vents need micro pore tape
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
Posts: 37,810
Loc: Canada
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The vents are inside the plate when its closed up The edge needs parafilm or saran. Tape would be a pita.
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YaMoonSun
The Double Standard


Registered: 10/23/14
Posts: 3,967
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Last seen: 5 months, 11 days
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I've never handled them, I'm sure I'll know what you mean once my order arrives.
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micro
bunbun has a gungun



Registered: 05/09/03
Posts: 7,532
Loc: Brick City
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Quote:
Pastywhyte said: Vented petri dishes have little raised sections on the rim of the bottom plate. This keeps the lid from sealing to the lower dish and forming and anerobic environment. Its so standard its often not even mentioned.
haha, i never knew that was a vent. neat xD
-------------------- Any research paper or book for free (Avatar is Maxxy, a character by Mizzyam, RIP)
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hamloaf
Loaf of Fam.

Registered: 12/23/09
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Quote:
Pastywhyte said: The vents are inside the plate when its closed up The edge needs parafilm or saran. Tape would be a pita.
Indeed.
One time Grey sent me some pasties of edible cultures with the lids wrapped in micropore tape. A huge sticky PITA it was.
Nice tid-bit of information over vented petri dishes, as well.
Edited by hamloaf (10/02/15 05:23 PM)
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Kizzle
Misanthrope


Registered: 08/30/11
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Quote:
aerow.thefox said:
Quote:
taGyo said: CO2 and O2 mix together. It's not an oil and water kind of deal.
im not sure im entirerly sure thats accurate. do they mix well and stay mixed in a normal enviroment? yea of course.
but they DO have different masses. and BOTH are gasses influenced by fluid dynamics. i would imagine if all gasses were trapped inside an air-tight container, with an even temperature throughout, the would naturally seperate into layers of gasses. with the most dense at bottom and least at top. without temperature or physical interaction causing disturbances in a material so easily moved... just my opinion. 
You'd think so but you also might think salt would fall out of water.
Like salt water the tendency for areas with high concentrations of CO2 to diffuse into areas of lower concentration (Entropy) is dominant. Density is simply not an important consideration when dealing with gaseous solutions, even in an airtight container.
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taGyo
Strainiac/AMU



Registered: 10/16/14
Posts: 18,802
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Re: Petri Question [Re: Kizzle]
#22325548 - 10/02/15 07:47 PM (8 years, 3 months ago) |
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-------------------- Gyo's Better Grows TNF Q&A AMU Q&A Dominus fortunae meae sum
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Kalistis


Registered: 09/06/15
Posts: 2,265
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Quote:
YaMoonSun said: Should I cheat and buy ten of these for $17? http://www.amazon.com/gp/product/B004MKHNJK?keywords=petri%20dishes&qid=1443758031
I've blown through 40 plates in a matter of 2 weeks and I am only on my second transfer! This is such a rip off. I think my biggest expense is the petri dishes and my time, but honestly, I much rather know that when a contaminant pops up that it was due to my fuck up than some pre-poured plates that I bought through amazon. But... I confess... I do love Amazon.
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PussyFart
Retired Cultivation Extrodinaire



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Re: Petri Question [Re: Kalistis]
#22325597 - 10/02/15 07:56 PM (8 years, 3 months ago) |
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You can get a case of 500 for around $80 shipped if you shop around.
That's the smart move.
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THIS HOBBY IS NOT FOR THE IMPATIENT! PLEASE BE PATIENT, DON'T BE A PATIENT! A Tale of 10 Isolates, GT Cluster Clone Monotubs, RR's Let's Grow Mushrooms DVD, SGFC(Shotgun Fruiting Chamber), Monotub Tek, Damion5050's Coir Tek, TL's Tek List, Frank's Tek List, EvilMushroom666's Pasteurization Tek, How It Should & Shouldn't Look - NEW CULTIVATORS GUIDE *** *** AFGHAN KUSH GROW LOG *** ***
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Kalistis


Registered: 09/06/15
Posts: 2,265
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I just buy mine through a distributor at work. Perk! The price fluctuates depending on the manufacturer. I got lucky and got a case of 100 discontinued Falcons for free from a rep that was trying to bribe me into another deal.
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