Thursday, February 24, 2005Result!!! (of a sort)I finally appear to have cracked my southern blot problem. This morning I printed the results of my latest southern blot - a whole 11 minutes before my "progress" meeting with SWMNBN.Over the past few days I have worked truly horrendous hours. Friday I worked from 10am until 11pm, on my last attempt at blotting. I then came in saturday and washed my membranes - only to find that there was no radioactivity showing on the membrane. Nevertheless I laid it down in a cassette overnight before going to a birthday party. Sunday, as expected - no result. The way a Southern blot works (continuing from Stress is making me ill), is that genomic DNA is cut into fragments and spread out along a gel. The DNA is then "blotted" - transferred to a Nylon membrane. The DNA then needs to be "probed" with a radioactive DNA fragment for visualisation. Probing relies on an intrinsic property of the DNA double helix - strands of DNA like to pair up. They do so because A always binds to T and C always binds to G. So if I have a single strand of DNA consisting of the sequence ACTGACTG, then its "complementary strand" TGACTGAC will stick to it, forming a double helix. The DNA bound to the membrane has been chemically treated so that all of the DNA is single stranded - and thus is looking for a complementary strand (my probe) to stick to. After making my probe (a short stretch of DNA identical to the gene that I am looking for that I have made radioactive), the last step is to boil it. This causes the 2 strands of the double helix to separate and become double stranded. Left to its own devices, this single stranded DNA, will form double stranded DNA again as it cools to between 50C to 60C. To stop this, the probe DNA is plunged onto ice to snap cool it as soon as it is boiled, thus remaining single stranded. The membrane from the blot is placed into a heated oven, in glass tubes with caps at either end. In to this is poured a soapy solution called hybridisation solution. The bottles rotate slowly, ensuring that the solution sloshes constantly over the surface of the membrane. To this bottle is added the radioactive DNA probe. The single stranded DNA is heated to 65C in the oven. Now single stranded DNA at 65C is ready for action! Its all loved up and desperately wants to partner up with another, complementary piece of DNA! Woohoo! Party! As the probe sloshes around the bottle it inevitably comes into contact with some of the single-stranded DNA stuck to the membrane. If it finds a piece of DNA complementary to it self is sticks. That spot on the Nylon membrane is now slightly radioactive. After about 16 hours (ie overnight), the solution in the bottle is discarded and the membrane is washed repeatedly in a slightly less soapy buffer to remove any unpaired single stranded probe molecules. Crucially, the paired probe remains bound to the DNA stuck in the membrane. Thus the membrane has patches of radioactivity on it. All previous blots have failed at this stage, with no radioactive probe bound to the membrane. After getting completely shit-faced at the birthday party on saturday night, I dragged myself delicately into the lab sunday evening. I had a little over 60 hours until my next "progress" meeting with SWMNBN and had no choice but to start again from scratch. I remade all of my solutions from scratch, adjusting them to a precise pH and digested more DNA. I finished at 3am. Monday I dragged myself into the lab after lunch. Time until meeting: 44 hours. I ran the gel, before using a new protocol to blot the gel. 8 hours later I had a nylon membrane, hopefully with DNA bound. Normally, one would wrap the membrane in clingfilm, stick it in the fridge and come back the next day. That wasn't an option, with the meeting looming. Wearily, I started to make my DNA probe, before adding it to the bottles with the membrane to hybridise overnight. I left the lab at 6am and caught the first bus of the day home to bed. At lunchtime, my alarm clock woke me so that I could write the pre-meeting progress report demanded by SWMNBN. Time until meeting: 22 hours. After snatching a few hours more sleep, I headed back into the lab to wash the excess probe off the membrane. Now things were looking promising, as I ran the geiger counter over the membrane - it started to click. Yes!!! Some radioactive probe had bound to the membrane. It wasn't much granted - the radiation level rose from 0.5 counts per minute (normal background in the lab) to 2 counts per minute (probably the same as a large lump of granite!), but I'll take it! I carefully laid the membrane flat in a lead-lined cassette and placed a radiation sensitive screen in there with it. I then placed it to one side. Time to meeting: 10 hours. After lying awake most of the night worrying, I crawled into the lab. I placed the radiation sensitive screen into the scanner and sat back. Miracle of miracles an image appeared of a the nylon membrane - complete with faint black bands where I hoped the gene I was looking for would be. YES!!!!!!! Time until meeting: 11 minutes.... The meeting went as expected. I had been prewarned that SWMNBN was furious with my lack of progress to date and "looking to tear me a new arsehole". It came to my turn to get grilled, and she turned over a copy of my "progress" report - covered in red ink and angry looking scribbles. "Before we start," I said, "I just want to show you this - hot off the laser printer" and handed her the printout. Flummoxed!! I could see that she was seething and absolutely torn. On the one hand, we had the first positive results in months - on the other hand I am sure she had spent hours in front of a mirror practising what she was going to say. After grilling me for 30 minutes with little conclusive to say the meeting concluded. "Well you've made some small progress. Now can you press the accelerator pedal a little harder and get us the data we need for the conference next month.." |
Wednesday, February 23, 2005The Tuesday Twat(s)No. 6. Vending Machine Manufacturers"Please insert exact change only" Flashed the little green LED display. I stared morosely at the rows of nutritionally vacuous, yet oh so tempting crisps and chocolate bars. Then at the £2 coin in my hand. How could it have run out of change already? It was only filled 2 hours before. Well I suppose its obvious really - its an easy way of making more money. Instead of charging 50 pence for a packet of McCoy's crisps and risk customers saying "How fucking much?" and going somewhere else. Instead, charge 45 pence and don't give change. Thus customers tut at the expense (after all 45p is still very expensive) - but still buy the crisps. Crucially, when they only have a 50 pence piece they'll grumble - but figure "its only 5 pence" and push it in the slot. But it gets worse. Not only do they not give you change - they don't let it carry over into the next sale. So lets do the maths. Sanescientist wants a packet of crisps (45p) and a chocolate bar (another extortionate 45p). Its 4am - nowhere else is open. SaneScientist's wallet has four 20 pence pieces, two ten pences an old bus ticket and a USB memory key. Sadly, there are no 5 pence pieces either in my wallet or in my sock. How an honest person would design the machine: Its out of change (genuinely - everyone has paid with pound coins and the float has emptied). Sanescientist puts two 20s and a 10 in (50p) and asks for crisps. The crisps drop, crushed and split the metre or so from their shelf. The display reads "Amount entered 5p". Sanescientist has a choice he can either think of his waistline and walkaway now, leaving the 5 pence to put a smile on a colleague's face in the morning - or he can put another two 20s in and get his choccie bar. He thinks "Fuckit - the next person might be SWMNBN - I'm not giving her 5p" so opts for the chocolate bar. Total cost 90 pence. How major vending machine manufacturers design their machines: Set the display default to "Exact change only please" and don't, under any circumstances, give change. Ever. Sanescientist places two 20s and a 10 in the slot. His mangled crisps emerge from the other end of the machine. The machine displays "Next customer. Exact change only please". Sanescientist needs his chocolate fix, so against his better judgement he stuffs his remaining two 20s and 10 into the slot. Chocolate bar is unceremoniously dumped in the tray, display reads "Next customer. Exact change only please". Total cost £1 11% additional profit - none of it earned honestly. Of course this sort of thing has been going on for years. How often has the machine "Swallowed" your money? And why, if the machine has run out of a certain item, will it still take your money if you accidently enter the wrong code? Recently, they've gone one better. It used to be that the machine in our canteen would swallow money on a regular basis. Fair dos. I would speak to the pleasant woman on the till, who would note my name down (and I wear an ID badge - I can't lie!) and give me the money out of the till. When the technician arrived to fill it, she would tell him how much she reckoned we were owed - he would check the money in the machine against the inventory and pay up. A year or so ago, we could no longer have money out of the till since it affected the canteen's cashing up. Fair enough. So she would make a note of your name, show it to the technician and then next time you came in to the canteen reimburse you. Now, the affected customer has to write to the manufacturer of the vending machine, who will post a cheque to the customer, to reimburse the cost. Who in their right mind has time to write a letter to recieve a cheque for 5 pence? How much extra profit do vending machine manufacturers make from this? Are they cynical enough to actually include it when estimating their profits over the next quarter? So, this week I am temporarily renaming the post "The Tuesday Thieving bastards". Twats. Labels: The Tuesday Twat(s) |
Saturday, February 19, 2005Oh dear...Sadly predictable.... |
Wednesday, February 16, 2005The Tuesday Twat(S)No. 5. The Sales Rep.As a bench biologist, I get through a lot of stuff. From big shiny pieces of equipment, to my day-to-day consumables, such as disposble plastic tubes and pipette tips and enzymes. Molecular biology has changed over the years. For example, take DNA purification. An experiment may involve several, different manipulations being performed on the same piece of DNA. After each manipulation it is typically necessary to repurify the newly modified DNA to get rid of the enzymes and chemicals used in the previous step to stop them interfering with the next step. Years ago, DNA purification was a lengthy process involving the use of nasty chemicals such as phenol or chloroform. Each procedure typically reduced the amount of DNA product left in the reaction, as some was inevitably removed with the solvents. Today, a DNA purification simply involves inserting a little column into a tube, pouring your DNA solution into the top and spinning for 60 seconds in a centrifuge to draw the liquid through the column, where the DNA binds. A couple of solutions are washed through the column to remove all the gubbins from the previous reaction and hey presto! As if by magic pure DNA is eluted out the bottom into a tube. Total time is typically 20-30 minutes and dozens of clean-ups can be performed simultaneously for £1 or £2 per reaction. Most of the consumables are available in the university Central Stores and can be delivered to my bench within a few hours after ordering online. Most of the lab's consumables not stocked in stores are ordered in bulk by our technicians who keep an eye on the communal stock levels. Unfortunately, every so often I need to order a slightly unusual item directly from the suppliers. This is where the "rep" comes in. Sales reps are the bane of every biologist's existance. Sure, they may enter you in a free prize draw for a bottle of champagne occasionally, and I never have to buy a pen or a mug - but that's just public relations. Many biological suppliers refuse to list the price for what you want in their catalogues - either the 2 kg paper catalogue that fills your pigeon hole whether you want it or not, or the somehow slick but entirely unusable online catalogue. Since a price has to be given to our finance department before they will authorise the order, its therefore necessary to phone for a price: Ring Ring "Welcome to Large Supplier Inc. If you want to query an order, please press 1. If you want to cancel an order, please press 2. If you want to order the 2005/2006 catalogue, please press 3. If you want to ask about this month's special offers, please press 4. For all other enquiries, please press 5." Naff music plays for 30 seconds. Ring Ring I grab my pen expectantly. "I'm sorry, your call is important to us. Please wait whilst a customer service advisor becomes available" Naff music starts all over again. This repeated for 10 minutes or so. Finally, "Hello, this is Emily speaking, please may I have your customer service number". "I don't have one. I'm just ringing to check on the prices for a little piece of revolutionary labour saving plastic" "Do you have the catalogue number?" "Yes, its 12345." Clicking of keyboard "Is that a little piece of revolutionary labour saving plastic?" "Yes, I just need a price" "I'm sorry, I will have to foward your call to the little piece of revolutionary labour saving plastic department, please hold." Naff music plays for 30 seconds. Ring Ring "I'm sorry, your call is important to us. Please wait whilst a customer service advisor becomes available" Naff music starts all over again. This repeated for 10 minutes or so. Finally, "This is the little piece of revolutionary labour saving plastic department, John speaking. May I have your customer service number please." "I don't have one. I'm just ringing to check on the prices for a little piece of revolutionary labour saving plastic" "Do you have the catalogue number?" "Yes, its 12345." Clicking of keyboard "Is that a little piece of revolutionary labour saving plastic?" "Yes, I just need a price" "May I take some details please? Where are you caling from, sir?". Sigh "I just need a price" "I'm sorry sir, I need to now where you are calling from," "Large English University". More clickingi "Could you tell me your name please, Sir?". "Dr SaneScientist". "Thank you Dr SaneScientist - how may I help you?" "I... want... a... price". "Your local representative is Claire, her mobile phone number is 07xxxxxxxx". "I just want a price, so I can send an order this afternoon." "I'm sorry doctor, in order to give you the best possible level of customer service, all of our prices are negotiated individually with your local sales manager. Please phone her mobile phone number. Is there anything else I can help you with?". *Wearily* "No". So I phone Claire, Ring Ring "Welcome to the Orange Voicemail messging service for *Claire*" I leave a message complete with my contact details. 2 days later "Sanescientist - somebody called Claire to talk to you on the phone" "Who?" I shout, putting down my pipette and removing my gloves, labcoat and eye protectors, before leaving the lab. "Hello, Sanescientist - its Claire from Large Supplier Inc. You left a message for me?" "Err, yes, I wanted to know the price for a little piece of revolutionary labour saving plastic". "I'm afraid that I don't have the price lists with me. However I am at your University on wednesday, which lab do you work in?" Wednesday arrives, as does Claire in power suit clutching a diary the size of a small country and a £3,000 lap top. The smell of too much perfume follows her like diesel fumes from an old lorry. "I would like the price of a little piece of revolutionary labour saving plastic, please". "What do you want to do with the little piece of revolutionary labour saving plastic" "My... experiment". "How many do you think you will need?" "One" "Well if you buy 50 or more you will get a 10% discount." "I just need one". "Does anybody else in your lab use a little piece of revolutionary labour saving plastic?" "No, I just need one" "Do you think that your stores manager would be prepared to stock them in stores?" "I don't know. I am not the stores manager." "Ok, they cost £4 each". Labels: The Tuesday Twat(s) |
Blogger ate my fucking postJust typed a long post about upcoming royal wedding.Hit post and Blogger failed, losing my post. Cunt. |
Wednesday, February 09, 2005The Tuesday Twat(S)No. 4. Opinion for Rent.OK, this one is a mixed bag. TV these days, seems to be saturated with cheap, low-budget, cobbled together, nostalgia shows e.g. "Top 100___", "I love the 19_s"; "TV's greatest___" etc etc etc ad infinitum. The quality of the shows depends largely on the subject matter. Lets face it "TV's greatest soap moments" is never really going to compete with "The Top 100 Films of all time - ever" is it? Some of these shows are also quite good. There are a couple of very watchable music shows that take a particular year or decade, highlight the most interesting music (good and bad) and place it within the social, political and musical context of the time. Frankly, if I were a history teacher I'd record these shows and show them to my GCSE class as a taster of the period under discussion. But if there is one thing these shows all have in common, its the "Rent an opinion" Z list celebrity getting all enthusiastically nostalgic over something that they are patently too young to remember. There are two types of people that do these shows 1) The "New Face". This is somebody just starting to make it in their career. Their agents are tasked with getting them maximum exposure wherever they can. They fill in at short notice on "topical" News/Sports/Music/Comedy quizzes, fall out of nightclubs in the early hours of the morning and will give an opinion on any topic regardless of whether they are familiar with it or not. Examples include those two irritating women who tell other people what to wear; that security guard who shagged a Spice Kitten (or something - I really don't give a shit) and inexplicably appeared on "I'm a celebrity get me out of here" and Kate Thornton. They do everything going for about 12-18 months before either making it and becoming too expensive, or finally going back to serve behind the bar at their local Wetherspoons. Think Jonny Vegas about 4 years ago or Jimmy Carr 2 years ago. Expect Bez to start pretending to remember the early 90's and to answer questions on subjects other than "How fucked in the head were you and Shaun Ryder when you starrred in the Happy Mondays?". 2) The "Old Face". This is a faded celebrity of yesteryear, grabbing their last chance at stardom - or at least making enough money to finish the repayments on their second hand Merc. You can smell the fear and see the desperation in their eyes. They were usually famous very briefly for one thing 15 years ago and have touted it shamelessly ever since. First they were able to sell their autographs and make a respectable living, eventually they were reduced to the second choice to open their old primary school's summer fate. Finally, they couldn't even get a booking for fresher's week in a New University. They have no transferable skills and no hope. They can however remember and reminisce about anything you ask them to and can usually read their pre-written responses unaided from the script. Libel laws prevent me from naming names of course - but frankly do I need to? The most irritating thing about these people is the amount of air time they take up. A three hour show highlighting the best music of the 70s could hold 40, back to back 3 minute songs. Hell, it may even be worth recording and playing back as background music. But no. Less than half of the show is actually about the subject matter, most of the show is about the "memories" that these so called celebrities have of the event in question. And even when they do SHUT THE FUCK UP, they only play about 40 seconds of the song! Its like listening to the 30 second preview on one of those legal music download services. Do I need to make an analogy involving masturbation, late-night French films on Channel 4 and your mother knocking unexpectedly on your bedroom door to ask if you've finished your homework? So to whom should the Tuesday Twat award go to? The Twats who accept £50 and a buffet lunch in TV centre to "Star" in these shows? Or the Twats who squander our TV budget on such drivel instead of investing in something actually worth watching? PS If any TV producers are reading this blog I am quite happy to exagerate my 4 weeks blogging experience for a documentary on the subject. I am also quite capable of wearing a grey wig and reminiscing fondly about spam shortages during WWII. Labels: The Tuesday Twat(s) |
Wednesday, February 02, 2005The Tuesday Twat(S)No. 3. The Health and Safety ExecutiveHealth and Safety Executive Please Note, that access will be required to all apartments on Tuesday the 1st of February. This is to allow Health and Safety stickers to be placed on all windows. So reads the notice pinned to the door in my apartment block yesterday. What? Has the world gone mad? Already we have had window inspectors come around to ensure that I haven't disconnected the locking bracket that restricts my window's opening to a 4 cm gap. What precisely do they think I will be doing with the windows that is so dangerous? I live on the 8th floor. I estimate that there is 23 metres of fresh(ish) air between my window sill and the busy road below. Do they think that I am going to remove the window (it swings downward so I can't just push it open), climb on top of the bookcase and dangle my legs out of the window so that I can get an extra large lungfull of the exhaust fumes from the buses trundling past? Perhaps they are worried that I may be playing volleyball near the window and inadvertantly jump up, squeeze through the gap and fall to my death below? Maybe they are concerned that my parents will sue the Building Management in the event of my death "He was a lovely lad, but a bit simple. If only you had placed a sticker on the window telling him not to smash through the reinforced double glazing with the nest of tables, then impersonate that scene from Bridget Jones' Diary, whilst listening to Geri Halliwell murdering 'its raining men', then he'd still be here to day". When I signed the contract for my apartment, I had to fill in one of those nosy forms that ask your ethnicity, your marital status, who you work for, how much you earn and if you like a quick hand shandy before showering in the morning. If they had simply asked the simple question "Are you a stupid fucker?", then they could have saved the expense of printing all of those stickers. As it happens, Tuesday has come and gone and I haven't had a knock on the door from a Sticker Application Technician. I figure that if I jump out the window now, my parents could still sue Building managment and retire early. I really am selfless sometimes. Whether these stickers are actually mandated by Her Majesty's Health and Safety Executive, is unclear. But it is the sort of thing that they would think up. Being a professional scientist, everything I do is governed by a remarkable number of Health and Safety regulations. Whenever I use a new chemical in the lab, I have to read and sign a COSHH form (Control of Substances Hazardous to Health). If it's a chemical that no one happens to have used in our lab before, then I have to create a new one. Sure, I can see the wisdom in making sure I've read the safety notice on the side of the bottle of concentrated hydrochloric acid - but sodium chloride (that's table salt) or (and I'm not exagerating here) WATER? Water by the way may cause breathing difficulties if inhaled. If splashed in the eye, wash out with copious amounts of warm water and seek medical advice. Laboratory rules are quite straight forward. 1) Appropriate protective equipment must be worn at all times. i.e. a lab coat. Also safety glasses and gloves. Sure I wear my lab coat when I am doing experiments - I'm too tight-fisted to buy a new T-shirt if I spill acid down the front for starters. But is it really necessary to wear one when I just nipped into the lab to take some DNA out of the freezer? And safety glasses? The days of wearing face fitting diving masks are long gone fortunately, but the glasses still resemble a cross between NHS glasses circa 1960 and those massive oversized novelty sunglasses that you used to buy at the beach as a kid. And the side protection (clear perspex shields that sit between the lens and your ear) make you feel that you are constantly being followed by some stalker who remains in your peripheral vision. I wear my safety specs when using the microwave (in case the stuff overboils), when using dangerous or corrosive chemicals (in case I splash) or when using radioisotope (stops splashing and reduces stray radiation damaging the retina - probably bollocks but it makes you feel better). I DO NOT wear them when standing at my bench working out my experimental protocol on the back of a post-it note. And gloves - I get through countless pairs of latex surgical gloves each day. But that will soon be a thing of the past if HSE gets its way. They are getting increasingly concerned with the rising numbers of people with latex allergies. Recently they banned powered gloves. This was a good thing. Even after a weekend away from the lab, my hands would still smell like the inside of a used condom come monday morning. Now however they have decided that all latex gloves must go and be replaced by nitrile. The problem is that latex is stretchy. A good fitting pair of gloves is like a second skin - I take a medium size and find I don't even notice I'm wearing them. Nitrile gloves by contrast don't stretch at all and I am between sizes. Medium gloves squeeze my hands uncomfortably and the resistance means that opening and closing my hands makes my fingers ache after a few minutes. The large gloves hang of my hands in a manner reminiscent to that guy at the end of Robocop who falls in a vat of toxic chemicals and his skin falls off. There is no feeling in them and the loose rubber tends to bunch slightly on the finger tips. I have no history of any allergies (neither does anyone in my family), and don't suffer from dry skin or eczema - I figure the danger of developing either condition is far outweighed by the danger to my skin of me dropping a bottle of corrosive chemicals or to my self respect if I have a public temper tantrum because I've just cross-contaminated my samples by dropping the sterile toothpick I'm trying to manipulate aseptically. 2) No eating, drinking, smoking or applying of cosmetics. This comes under the category of "No hand to mouth operations". Commonsense advice I'm sure you'll agree. We work regularly with E. coli in addition to various dangerous substances. But surely, this also covers most of the requirements of a COSHH form? I.e Chemical X is non-corrosive and doesn't give you breathing difficulties - but it'll make you as sick as a parrot so don't lick your fingers after weighing it out. Surely, chemicals can be classified into two broad groups: 1) Poisonous if swallowed - so don't. No need to fill in a COSHH form. 2) Has other dangerous properties - fill in a COSHH form and take additional precautions. So paranoid about health and safety are some lab managers, that I have seen people standing outside the lab frantically chewing a throat lozenge that they have been sucking in the write-up area, so that they can cross the threshold into the lab to get a marker pen or their lab book without breaking H&S. Unless they are one of those disgusting individuals who like to remove half-chewed food from their mouth and inspect it before putting it back in - what's the problem? We're supposed to be highly trained professionals, can't they trust us? With all of that said, you'd think that the Health and Safety Inspectors would have a field day when they visit the lab. Funnily enough they don't. Firstly, our lab manager emails us a week before the inspection and tells us that, under no circumstances whatsoever is anyone to be actually doing any work in the lab when the Inspector arrives. And that we should all have a tidy-up before the big day. The result is a spotlessly clean laboratory with no evidence that anyone actually does any science in it. And 20 lab members drinking coffee and trying to look inconspicuous in the write-up area. Our last inspection turned up two major faults. 1) The padlock to the isotope fridge was undone. We felt it best not to mention that nobody knows where the key is. The fact that to gain access to the lab requires swipecard access and a key is irrelevant. Al Quaeda are everywhere! 2) People shouldn't leave their lab coats on the back of their chairs - its a trip hazard. I for one feel just that little bit safer...
Labels: The Tuesday Twat(s) |
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