Team:Leicester/September2012

(11:00 am) Some of the team calculated the concentration of 16s extracted DNA to be run on an agarose gel and later for sequencing. The calculations allow the most efficient use of the DNA stock.

(14:00 pm) 2μl of DNA were added for samples 3, 4, 5 and 6 whereas 4μl of sample 2 DNA were added due to the stock concentration being lower. The amount of marker added was varied, which allowed the concentration of samples to be determined and the accuracy of the nano-drop spectrophotometry to be checked.

(15:45 pm) The gel was loaded as:

X

X

Marker (4μl)

2 (4μl)

3 (2μl)

4 (2μl)

Marker (2μl)

5 (2μl)

6 (2μl)

Marker (1μl)

X

X

X

X

The gel was then run for 1 and a half hours.

(16:30 pm) A group meeting was held to inform the supervisors of how the project has progressed and discuss a detailed plan for the 4th September. Plans for the future of the project were also discussed.

(17:30 pm) The gel was then transilluminated (pictured below) and the concentration of the DNA was determined for use in sequencing tomorrow (4th September 2012).

(09:00 am) Although some colonies from the growth curve experiment could be counted, but in general there was too much growth.

(09:15 am) The group worked on the wiki for the rest of the day, writing up the past weeks work, making sure all the details were correct and in the right order, and then attributing the members as required.

(09:00 am) In preparation for a meeting later in the day, members of the lab discussed pathways involved in polystyrene degradation.

(11:00 am) A meeting was held with supervisors discussing the next steps of the project, with hopes to try and engineer a BioBrick. It is suspected that genes involved in toluene degradation such as TodX, TodC1&2, TobA&B and others present in the TOD operon may also be involved in the pathway for polystyrene degradation.

(12:00 pm) Databases containing genomic sequencing and BLAST were searched to find bacteria that used proteins similar to those discussed above for PCR. Although Pseudomonas aeruginosa didn’t have any of the genes, Pseudomonas putida F1 had them all.

(15:00 pm) With the help of a supervisor, one member of the team set up a PCR reaction for 16S DNA to increase the amount of DNA in the forward and reverse directions (in separate tubes) ready for sequencing tomorrow.

Yellow and Orange colonies were plated out and 01#502 was streaked again. This allows fresh colonies to be maintained, ready for storage at the end of the project.

(16:00 pm) The wiki was updated and BLAST searching for candidate genes continued.

(09:00 am) An early start with no set experiment today. Two of the colonies were plated out to see if they are two forms of the same bacteria or simply two separate species. This required plates being made, then individual colonies picked out to streak them. Once finished it was a day working on modelling, writing protocol and other computer work before checking the results of the plates in the late afternoon.

(16:00 pm) Some spec readings were taken of the MMP broth, with the blank just being MM broth. At 600nm wavelength the results came back for the mixed culture as 0.334, and the orange culture as 0.6.

(14:00 pm) A meeting was held to share the achievements of each individual section of the project (modelling, lab work and chemistry). Job roles were assigned to each person to complete in labs and on the computer modelling.

(16:30 pm) More polystyrene minimal media plates were prepared, ready for plating out some colonies from CSE kits, to see whether more positive results can be obtained from other samples.

(17:00 pm) Minimal media was made from minimal broth.

(17:05 pm) The Boilate was set up with a sample of our unknown bacteria to extract the DNA, ready to set an overnight PCR reaction so that we can sequence the 16S ribosome later on this week.

(17:20 pm) The master mix was prepared for 14 PCR reactions. 270μl of the master mix was made up, enough for aliquoting 18μl into 15 reactions.

The reaction mixture contained:

DNApol is stored in glycerol and required mixing and spinning down for a second. The remainder of the dNTPs were disposed of as they should not be freeze/thawed many times. In the PCR hood, the master mix was aliquotted into 9 separate PCR eppendorfs with 18μl in each and the negative control prepared using PCR clean H20. The tubes were then taken to the bench where the DNA and diluted bacteria were added. 2μl of all samples were added to make a final volume of 20μl, including the positive and negative controls (see gel lane organization).

Also the teams organic chemists have been designing a number of mechanisms. The mechanism below shows the final synthesis after much improvements. It shows the conversion of the monomer styrene being converted to lactic acid. A company called styrofoam specialise in polymerising lactic acid for easy environental breakdown. We think this route may be a viable synthetic route however due to the nature of the reagents used and conditions, there are other routes to look in to.

(09:00 am) A 2% agarose gel was prepared to run the PCR products on. One member of the team updated the project Wiki page. Attempts were made to track down the P. putida F1 strain which has possibly been located.

(09:40 am) The gel was poured and left to set. 5μl of loading dye was added to the PCR products ready to run on the gel.

(11:15 am) The gel was loaded and run at 120 volts. Lane organisation:
1) Positive control 10ng P. aeruginosa DNA from the Maxwell prep
2) Positive control 10ng P. aeruginosa DNA from the Maxwell prep
3) Neat orange culture DNA
4) x10^-1 dilution Orange culture DNA
5) x10^-2 dilution Orange culture DNA
6) x10^-3 dilution Orange culture DNA
7) x10^-4 dilution Orange culture DNA
8) Neat Yellow culture DNA
9) x10^-1 dilution Yellow culture DNA
10) x10^-2 dilution Yellow culture DNA
11) x10^-3 dilution Yellow culture DNA
12) 5μl Marker 100bp thermo scientific
13) Negative Bench H₂0
14) Negative Hood PCR H₂0

The Sau3AI partial digest was prepared. The experiment was run for 30 minutes as from the last test the only lanes which were digested enough were the times 5-15 minutes. A "no enzyme" control was also run.

(12:30 pm) Following the results of sequencing the 16S ribosomal DNA, a BLAST Search was conducted to find the genus of the bacteria cultured from the 01#502 CSE kit, which turned out to be a Pseudomonas of unknown species.

(13:20 pm) The agarose gel was stopped and a photo obtained from the transilluminator:

The PCR was repeated overnight with the x10-1 orange dilution and the 0 yellow dilution with 5μl of each as the amount recovered from this gel may not be enough for the sequencing. There were two different coloured bacteria growing and this was conducted to distinguish if these are two different species of bacteria or the same one with a different morphology of colony.

To see how much DNA can be recovered, a QIAGEN gel extraction was performed and more DNA amplified overnight.

A gel was prepared for the Sau3AI digest which has completed.

(15:10 pm) The gel was cut and the samples of DNA removed and weighed. The QG buffer was added at x6 the amount in μl of the amount of agarose there was. The samples were placed in the 50 degree incubator and vortexed every 2 minutes to dissolve the agarose.

(15:30 pm) Unfortunately, the Sau3AI digest was carried out at 37 degrees rather than the intended room temperature which might have produced better bands. Therefore, the experiment was repeated. However, the gel was still run to obtain results and confirm the need to reduce the activity of the enzyme. Spectrophotometric analysis was conducted for the experiment set up on the 31st, after 2 day's extra growth; mmb with 5% poly resulted in OD600 mixed = 0.053 at a 10x dilution, 0.53 at 1x dilution. Orange was 0.072 at a x10 dilution, 0.72 with no dilution. This was higher than previous demonstrating that the bacteria was growing in the broth with no other carbon other than sugar beads at 5% concentration. To confirm this the experiment, it will be repeated with more controls totalling at 8 tubes.

(16:00 pm) A gel was loaded using the Sau3AI digest from earlier, the DNA was extracted from the earlier electrophoresis using a QIAGEN QIAquick Gel Extraction Kit and the wiki protocol was updated.

(16:30 pm) The Boilate was prepared for PCR overnight using the 16S yellow and orange colonies. Only the 5 neat yellow cultures and 5 x10-1 orange cultures will undergo PCR as these seemed to be the best. Unfortunately, it seems that there will not be enough DNA to sequence.

(17:15 pm) The Boilate was finished: centrifuging and then removing the supernatant. Dilutions were prepared while the master mix for PCR was prepared in the PCR hood.

(17:30 pm) The Sau3A1 digest was then transilluminated:

(17:45 pm) The DNA was added to the samples ready for PCR. The program used was the iGEM16S which progresses as follows:
98 degrees C - 5 min
98 degrees C - 30 seconds
50 degrees C - 30 seconds
72 degrees C - 2 minutes
72 degrees C - 5 minutes
15 degrees C - Forever (this is for the end of the reaction).

(09:00 am) A new 2% gel was prepared for the PCR samples which were being prepared. Prep for the Sau3A1 digest at room temperature began.

(10:30 am) One of the gels was remade, as well as another 2% gel ready for the "Gelception" gel, where the team is testing the extraction method.

(12:10 pm) The PCR products were then loaded onto a gel using as much of the sample as possible (22μl). The gel was run for 2.5 hours at 120 Volts, ensuring the bands are well separated for gel extraction. The Sau3A1 prep was finished and samples placed into the freezer.

(13:00 pm) Some lab members looked at the primer designs for BioBrick.

(15:35 pm) The primers were designed, ready for ordering Monday morning. Once the gel finished, it was taken down for transilluminating. Some plates were also taken as some Pseudomonas species' fluoresce under UV light, as can benzene rings. Below is the photo produced from the gel.

(16:00 pm) None of the plates fluoresce under UV which may have been due to the excitation wavelength being different from those attempted. The PCR gel was then wrapped up and stored for gel extraction next week. As the Nanodrop results were low for yesterday's gel extraction from the PCR (at 4.8 for Orange, 5.1 for mixed and 3.2 for yellow when the two extracts were combined), PCR will be conducted using these samples to increase the amount of DNA. Time constraints meant that the "Gelception" gel is to be run on Monday.

(16:30 pm)The finalised primer sequences were sent to a supervisor to be checked and ordered. The master mix for PCR was set up in the PCR hood.There will be 13 PCR reactions, requiring 270µl of the master mix, enough for aliquots of 18µl in 15 reactions. Reaction mixture list:
171µl PCR H20
60µl HF buffer
6µl dNTPs
15µl Primer A 28f AAGAGTTTGATCCTGGCTCAGA
15µl Primer B 519R GWATTACCGCGGCKGCTG
2µl Template DNA to be added later to each PCR tube as it is not PCR clean
3µl DNA Polymerase

DNApol is stored in glycerol and required mixing and spinning down for a second. The remainder of the dNTPs were disposed of as it cannot be freeze thawed. In the PCR hood, the master mix was aliquotted into 9 separate PCR eppendorfs with 18μl in each and the negative control prepared using PCR clean H20. The tubes were then taken to the bench where the DNA and the positive P.aeruginosa DNA and negative bench H2O controls. All samples were added at 2µl to make a final volume of 20µl.

PCR cycle program used was iGEM16S (same as before):

Yellow had the lowest stock concentration so four reactions were prepared. Due to the difficulties with the dilutions in the boilate from Wednesday, multiple reactions were run for each of the extractions in case one doesn't work.

(09:00 am) A 0.7% gel was prepared and DNA markers found - ”HyperLadder 1".

(10:30 am) A 2% agarose gel was loaded with DNA recovered from a previous gel from last week. The lane order was as follows:
5µl DNA HyperLadder 1
x
4µl 100bp DNA ladder
x
20µl of DNA recovered from PCRed mixed colonies
x
2µl DNA HyperLadder 1
x
20µl of DNA recovered from PCRed Orange colonies
x
20µl of DNA recovered from PCRed Yellow colonies
x
1µl DNA HyperLadder 1
x

This gel was run at 120 volts.

(11:00 am) The 0.7% gel was poured ready for running the Sau3A1 digests.

(11:50 am) The gel containing recovered DNA from a previous gel was transilluminated. It showed little band movement and the gel was run for an additional hour.

(12:15 pm) The Sau3A1 digests were loaded into wells on the set 0.7% gel. The lane organisation was as follows:
x
DNA HyperLadder 1
x
DNA digest without enzyme
DNA digest after 0 minutes
DNA digest after 5 minutes
DNA digest after 10 minutes
DNA digest after 15 minutes
DNA digest after 20 minutes
DNA digest after 25 minutes
DNA digest after 30 minutes
x
DNA HyperLadder 1
x

This will be run at 100 volts

(13:00 pm) The recovered DNA gel was retransilluminated, and the bands are a lot more spread:

(13:20 pm) The Sau3A1 digest was checked and it was decided to leave it in for longer, though the loading dye appeared to be running slightly quicker at one end of the gel.

(13:30 pm) The primers that were designed on Friday were looked at by one of the supervisors. The adjustments add degeneracy to make them more likely to PCR out the genes that the team want to extract. BLAST searches of the FASTA data, showed that the sequence in P. putida, regardless of strain, is remarkably conserved, with only one or two bases needing any degeneracy at primer binding sites. These modified primers were sent off to a supervisor in advance of the deadline and will hopefully arrive at the end of the week, allowing PCR to begin on the genes that will be made into Biobricks.

(14:45 pm) Once the Sau3A1 digest gel showed the loading dye was a couple of inches off the end, it was taken to the transilluminator. The results are depicted below.

(09:00 am) P. putida was streaked out onto LA to isolate single colonies. The P. putida strains were also put into LB for Maxwell prep tomorrow to extract the DNA. The 1/100 dilution PCR was prepared for running on a gel that had been stored in the fridge. The wiki was updated. A 2% gel was prepared for running the PCR reaction products.

(11:00 am) Polystyrene 'sugar' was prepared for a polystyrene-propane experiment to see whether propane, which is an expanding agent in the expansion of polystyrene, could have caused the mystery Pseudomonas species to grow rather than the polystyrene. Propane is already in the sugar before expansion and requires ventilating it for several days to remove the majority of the propane. However, if the lid is left on for a time, propane will still build up. The 'sugar' was soaked in varying concentrations of propane, mixed with minimal media broth up to 0.4 ml, completely covering the 0.5g 'sugar' that will be put in each agar dish tomorrow. 0.4, 0.2, 0.1, 0.05 and 0.00ml of propane were used to soak 0.5g of polystyrene 'sugar' overnight on a shaker at 275RPM.

The Rockethub site for the project was edited in order to make it easier to read.

(14:30 pm) The gel was loaded with 1/100 dilution the PCR reaction. Unfortunately, with one of the gels, the comb was too long and the sample went straight through, wasting the majority of the first two samples.

Lane organisation:
1 = P. aeruginosa positive control
2 = Orange 100x dilution
3 = Orange 100x dilution
4 = Orange 100x dilution
5 = Yellow 100x dilution
6 = Yellow 100x dilution
7 = Yellow 100x dilution
8 = Yellow 100x dilution
9 = Mixed 100x dilution
10 = Mixed 100x dilution
11 = Mixed 100x dilution
DNA Hyperladder 5ul
13 = Negative control bench
14 = Negative control hood

This gel was run 2.5 hours at 120V . Each sample was 20μL, except samples 1 and 2 of which only 2μL and 5μL was left respectively.

(15:00 pm) Some Corning broth solutions were made using the pentane, 'sugar' and bacteria. They were made with varying amounts of pentane: 0.00, 0.05, 0.10, 0.20 or 0.40ml. There were 4 reaction conditions prepared: with the yellow Pseudomonas culture, 0.5g of polystyrene 'sugar', with the yellow bacteria only, with 0.5g polystyrene 'sugar' only, and with neither polystyrene or bacteria. The final volume for all solutions was made up to 10ml with the addition of minimal salts medium broth. Along with the 'sugar' soaking in pentane, this was put in the shaker at 240rpm overnight at room temperature to allow time to grow. It is planned to spec analyse the broth tomorrow and if the set with polystyrene and bacteria have the same growth as those without polystyrene, but with bacteria, then pentane has little if any effect on the growth of the yellow colony.

(15:40 pm) The bacteria are loaded into the Pentane Poly experiment, while the gel extraction of the PCR reaction of the orange and yellow single 16S was done. The experiment with the Yellow, Mixed and Orange colonies were ran through a spectrophotometer, however this experiment is going to be done again in triplicate to make sure that the results are not random, as well as the pentane with poly experiment to rule out this.

(16:00 pm) The yellow bacteria was inoculated in 10 corning tubes for the pentane test.

(17:00 pm) The gel extraction is completed at the same time a gel is being made ready for tomorrow. There were a total of 22 extractions going on:

1-5 were the orange bacteria.

6-10 were the yellow bacteria which have now been combined so there is only 3 tubes to Nanodrop tomorrow, which is equal to three lanes on the gel.

11-13 were orange PCR product gel extraction x100 dilution PCR product's.

14-17 were yellow PCR product gel extraction 100x dilution PCR product’s.

18-20 were the mixed PCR product gel extraction x100 dilution PCR product's.

The positive control was unable to be extracted as not enough was loaded.

(17:50 pm) The gel was poured ready for running tomorrow. The samples will need to be Nano dropped before the gel is ran to work out the amount of the marker to load.

(09:00 am) The contents of our swear box and late jar were counted to pay into our account when the bank opened. The class 2 lab was also decontaminated and all of the lab equipment brought back into our own lab. We're just sending/receiving emails at the moment.

(10:00 am) The pentane experiment from last night was ran through the spectrophotometer, as there has been some obvious growth. However after thinking about it, it may not be a very conclusive experiment. The corning tubes were combined and the gel extraction's from yesterday were nano dropped so we can work out how much to run on the gel. The shoes from the environment team were given to us as a Citizen Science experiment to be analysed.

The amounts of extract to use on the "Gelception" gel were worked out.

Lane organisation and volumes:
x
x
4μL of DNA Hyperladder ( 600bp band = 48ng 400bp band = 32ng)
2μL of DNA from extract labelled 4 ( according to the Nano 32.8ng)
2μL of DNA from extract labelled A ( according to the Nano 24.6ng)
2μL of DNA Hyperladder ( 600bp band = 24ng 400bp band = 16ng )
2μL of DNA from extract labelled 8 ( according to the Nano 22.4ng)
2μL of DNA from extract labelled 10 ( according to the Nano 22.8ng)
2μL of DNA Hyperladder ( 600bp band = 24ng 400bp band = 16ng )
2μL of DNA from extract labelled 5 ( according to the Nano 21.0ng)
2μL of DNA from extract labelled 1 ( according to the Nano 17.4ng)
1ul of DNA Hyperladder ( 600bp band = 12ng 400bp band = 8ng )
x
x

(11:00 am) We realised that we should have inoculated with a set amount of bacteria in solution, rather than just a swab. We will set up a rerun this afternoon so that we can analyse whether the bacteria use polystyrene or pentane in preference.

(11:20 am) The gel is loaded and it is running at 120V.

(13:30 pm) The pentane experiment is being reran. The protocol is almost the same, though this time, we used 0.1 ml less minimal media in the tubes needing the yellow bacteria, and replacing it with 0.1 ml of a 1ml yellow colony bacteria suspension in phosphate buffer solution (PBS) to make the amounts of bacteria in the broths more constant. The gel was stopped and taken to the transilluminator:

As poor amounts of DNA have been successfully extracted so far, the gel extraction kit is examined and needed testing to see if it worked. This meant we had to gather and PCR more DNA.

(15:00 pm)The pentane experiment was prepared and ready to be ran. The tubes used have been put on a shaker, and started off at 240rpm. It will be sampled tomorrow morning, and then Friday morning to determine the growth. The 1/100 dilutions of the last gel extraction which we amplified the DNA of were found, and the Boilate was ran to obtain more DNA and run this in the PCR as well.

The triplicate experiment was started.

(15:30 pm) To test the Gel extraction kit, our supervisor supplied a 1kb DNA ladder of known DNA concentration to pass through the coulomb to see what % recovery there is. This time new reagents from the box were used rather than the ones we have been using to see if this is the problem.

With the minimal media prepared it is set up with 10 ml amounts in 20 corning tubes, and 0.5g of polystyrene "sugar" is set up in the necessary tubes. In preparation for further testing after staying in the shaker for enough time.

(16:00 pm) One of the members worked on degenerate primers for the rest of the afternoon.

(16:30 pm) The gel extraction was finished and the tubes put in the fridge ready to run in the morning. The master mix for the PCR was created in the PCR hood. As we are doing 13 PCR reactions, we need to make up 270ul of the master mix which is enough for aliquots of 18µl in 15 reactions. Reaction mixture list:
171µl PCR H₂0
60µl HF buffer
6µl dNTPs
15µl Primer A 28f AAGAGTTTGATCCTGGCTCAGA
15µl Primer B 519R GWATTACCGCGGCKGCTG
2µl Template DNA to be added later to each PCR tube as it is not PCR clean
3µl DNA Polymerase
These reagents were added then as the DNApol was in glycerol the tube was mixed and spun for a second to remove bubbles. dNTPs cannot be freeze thawed so whatever was left was thrown. After this, 18µl aliquots of the master mix were placed into 9 separate PCR eppendorfs and prepared the negative control while in the PCR hood with the PCR clean H₂O. The tubes were then taken to the bench where the DNA was added, and the positive P. aeruginosa DNA and negative bench H₂O controls all samples were added at 2µl to make a final volume of 20µl.
PCR cycle program used was iGEM16S which is as follows:
98 degrees C - 5 min
98 degrees C - 30 seconds
50 degrees C - 30 seconds
72 degrees C - 2 minutes
72 degrees C - 5 minutes
15 degrees C - Forever ( this is for the end of the reaction)

DNA Samples: ( use this for loading of the gel)
1 = Positive control P. aeruginosa
2 = 100x dilution of orange gel extract ( from previous)
3 = 100x dilution of mixed gel extract ( from previous)
4 = 100x dilution of yellow gel extract ( from previous)
5 = Yellow boilate
6 = Yellow boilate
7 = Yellow boilate
8 = Yellow boilate
9 = Orange boilate
10 = Orange boilate
11 = Orange boilate
12 = Negative control hood PCR water
13 = Negative control bench H2O

(9:00 am) A new gel is made ready to load the PCR reactions and the gel extraction test.

(10:00 am) 2 more gels are poured ready for electrophoresis. The tubes from the PCR machine are removed and loaded with dye ready for the gel electrophoresis.

(10:30 am) The samples are loaded into one of the gels.

Gel lane organisation:
1 = Positive control P. aeruginosa
2 = 100x dilution of orange gel extract (from previous)
3 = 100x dilution of mixed gel extract (from previous)
4 = 100x dilution of yellow gel extract (from previous)
5 = Yellow boilate
6 = Yellow boilate
7 = Yellow boilate
8 = Yellow boilate
9 = Orange boilate
10 = Orange boilate
11 = Orange boilate
12 = Marker Hyperladder 5μl
13 = Negative control hood PCR water
14 = Negative control bench H₂O
Each lane was loaded with 20μl of sample as this was the most you could accurately load.

(11:00 am) The primers are produced , ready for PCRing tonight.

(13:00 pm) We loaded and ran the gel extraction test at 120v on a 2% gel. For this you need to make dilutions of the marker DNA to 100ng/50ng total amount of DNA. Load only 100ng of the samples, taking off 10% of the total volume of the elution from the column.

(14:30 pm) Delivery arrived from NewEngland Biolabs, a new sponsor donating some competent cells as well as more DNA ladders. The gel from earlier was transilluminated:

(14:40 pm) The Boilate reaction is prepared again to extract DNA for the PCR later.

(15:00 pm) The gel extraction test is redone, while the gel extraction test from earlier was transilluminated (no gel photo as it was an old machine). The test recovered too little DNA which is why we are re ran the experiment with new reagents from a new kit. As the PE was a new set it must be the QG at fault. 1ml aliquots are taken out of the pentane experiment corning tubes that was set up yesterday. Another 1ml aliquot will be taken tomorrow to compare the differences in growth of the bacteria in different concentrations of pentane, with or without polystyrene.

(15:40 pm) A new gel is made ready for the gel extraction to be run. The boilate for the PCR which is to be loaded later is completed, while a supervisor is setting up the Maxwell prep of the DNA for the PCR as well. The reaction mixture for the PCR of the different bacteria with the different primers was calculated.

(15:45 pm) The absorbances of the aliquots at 600nm of the pentane experiment were all measured:
Key:
0.XX pent – volume of pentane added to the minimal broth
Bac - 100µl of bacteria suspended in PBS added to the minimal broth
PS - 0.5g polystyrene ‘sugar’ added to the minimal broth
Abs - absorption at 600nm

Absorbance readings:
0.00 pent, Bac, PS Abs=0.292
0.00 pent, PS Abs=0.014
0.00 pent, Bac Abs=0.255
0.00 pent Abs=-0.009
0.05 pent, Bac, PS Abs=0.317
0.05 pent, PS Abs=0.003
0.05 pent, Bac Abs=0.259
0.05 pent Abs=0.001
0.10 pent, Bac, PS Abs=0.300
0.10 pent, Ps Abs=-0.025
0.10 pent, Bac Abs=0.250
0.10 pent Abs=-0.005
0.20 pent, Bac, PS Abs=0.182
0.20 pent, Bac Abs=0.007
0.20 pent, PS Abs=0.250
0.20 pent Abs=0.001
0.40 pent, Bac, PS Abs=0.203
0.40 pent, Bac Abs=-0.018
0.40 pent, PS Abs=0.260
0.40 pent Abs=0.026

The corning tubes will have another aliquot taken out tomorrow at 15:00, and absorbance will be measured again to determine growth. Hopefully the absorbance will change most in the tubes with polystyrene and bacteria in. Seeing as this is just for the yellow colonies, we will be repeating this experiment twice next week with our orange and mixed colonies.

(11:00) The gel from last night was tranilluminated:

(11:20) A gel was made ready for running the overnight PCR.

(12:00) The gel was loaded and started at 120 volts with the following lane organisation:
1 x
2 5µl DNA HyperLadder
3 P. aeruginosa
4 P. aeruginosa
5 P. putida strain A maxwell prep
6 P. putida strain B maxwell prep
7 Orange colony maxwell prep
8 Yellow colony maxwell prep
9 P. putida strain A boilate
10 P. putida strain B boilate
11 Orange colony boilate
12 Yellow colony boilate
13 -ve control bench
14 -ve control hood

(14:30)The gel was transilluminated. The extractions didn't work.

(15:00) The pentane experiment was continued (notation is same as thursday):
Absorbance readings:
0.00 pent, Bac, PS Abs=0.292
0.00 pent, PS Abs=0.014
0.00 pent, Bac Abs=0.255
0.00 pent Abs=-0.009
0.05 pent, Bac, PS Abs=0.317
0.05 pent, PS Abs=0.003
0.05 pent, Bac Abs=0.259
0.05 pent Abs=0.001
0.10 pent, Bac, PS Abs=0.300
0.10 pent, Ps Abs=-0.025
0.10 pent, Bac Abs=0.250
0.10 pent Abs=-0.005
0.20 pent, Bac, PS Abs=0.182
0.20 pent, Bac Abs=0.007
0.20 pent, PS Abs=0.250
0.20 pent Abs=0.001
0.40 pent, Bac, PS Abs=0.203
0.40 pent, Bac Abs=-0.018
0.40 pent, PS Abs=0.260
0.40 pent Abs=0.026

(08:30 am) The master mix for the PCR was created, and the PCR tubes are put in a PCR machine.

(09:30 am) Several gel extractions are set up using a new kit with a view to extracting the TodX gene later today. 2 gels are also made.

(10:00 am) The PCR was started.

(10:50 am) An experiment on the aeration of polystyrene was created by putting 20g polystyrene in 500ml duran, putting it in the hybridiser at 60 degrees, to try and vaporise residue pentane in the sugar. Pentane boils at 37^oC so the hybridiser is above the boiling point. The hybridiser has no exposed elements so should be safe for the small amount of pentane left to be vaporised. Two 10g amounts of poly have also been put into tubes and sealed to act as a time zero. These can then be used in a minimal broth poly orange and yellow growth experiment as we can be sure that there is no pentane left over.

(11:00 am) The pentane experiment was finished and the results analysed. There was a clear increase in absorbance by bacteria as pentane concentration also increases. The presence of polystyrene sugar also appears to increase the bacteria's absorbance, indicating an increase in bacteria concentration.

(13:00 pm) After nano dropping, and the PCR has finished, the gel extractions were ready to be ran. The PCR program for this run was changed as there was a lot of other interference bands of other amplified areas of DNA. The extension time has been reduced to one minute so only give enough time to amplify the shorter bands.

PCR cycle program used was iGEMTOL2 which is as follows:
98 degrees C - 5 min
98 degrees C - 30 seconds
65 degrees C - 30 seconds
72 degrees C - 1 minutes
72 degrees C - 5 minutes
15 degrees C - Forever (this is for the end of the reaction)