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The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions that produces urea (NH2)2CO from ammonia (NH3). This cycle occurs in ureotelic organisms. The urea cycle converts highly toxic ammonia to urea for excretion. This cycle was the first metabolic cycle to be discovered (Hans Krebs and Kurt Henseleit, 1932), five years before the discovery of the TCA cycle. This cycle was described in more detail later on by Ratner and Cohen. The urea cycle takes place primarily in the liver and, to a lesser extent, in the kidneys.

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  1. J

    Pipe Knocking During Dishwasher Cycle - Water Hammer

    Hello, I have spent ages looking on the internet to try and find a solution to this issue, and I apologise in advance as I know similar questions have been asked about this topic on here several times, but I would like to explain my specific issue with the hope someone might be able to come up...
    • jamieellis888
    • Thread
    • cycle dishwasher during hammer knocking pipe water water hammer
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
  2. A

    Radiator connected to hot water cycle - not harmful?

    Hello! In my flat I have central heating and hot water - all with gas boiler (with hot tank in flat + cold tank in loft). Now I had very old radiators in dining room which almost did not heat. I bought new large radiator and a plumber connected and closed taps of old radiators (it was hard to...
  3. M

    Vaillant VCW221 problem - Time/Delay cycle on CH

    What is the time delay between burner (on/off) when the CH is ON, at the moment my boiler is set to dial 5 and the timing is 5mins burner ON and 9mins OFF (delay), is this normal? For some reason the timing/delay screw has been adjusted recently by the engineer, and i feel that time/delay...
  4. M

    Radiators hot upstairs and cold downstairs

    I know this has been asked before but in different curcumstances This is a sealed system (pressurised) sytem boiler Glowworm Ultracom about 5 years old. The filling loop failed and it over pressurised and blew off about 3 bar. That fixed the doorstairs rads are stone cold. Upstairs are OK and...
    • martinryder
    • Thread
    • before boiler cold cycle downstairs hot radiator radiators upstairs water
    • Replies: 40
    • Forum: Plumbing Jobs | The Job-board
  5. K

    Van vs Cycle

    A big thankyou to the p...k who decided to cycle off the pavement right in front of my van. You absolute .......... However you are not maimed and can still walk! I am thankful for that. I am a little upset tho that I need a new bonnet, bumper, 2 x grills, numberplate and a load of hassle...
  6. F

    Cycle Helmets

    Do you think they work? If so should they be compulsory like in other countries? Maybe just for kids or on roads?
  7. N

    london plumbing maintenance by cycle or tube train

    hi all moving to london next month to set up my gas/plumbing biz on a shoestring of £100 any ideas on what part of londonn to launch in for one man band, should i commmute by cycle or tube or van? is central ondon best for gas and plumbing maintenance, how should i market, social media...
  8. cr0ft

    Can I interest any fellow plumbers in sponsoring our cycle?

    Hi all. A bit of a beg. Some friends and I are going to be cycling from Land's End to John'O'Groats this September and we're trying to raise as much cash as we possibly can for Cancer Research UK. I appreciate that I don't know any of you in real life (well apart from grahamgas) and times...
  9. L

    Charity Cycle

    I've been using Myson product for years and saw this article on a charity bike ride done by one of their apprentices, thought other people might be interested: An apprentice at Tyneside heating products manufacturer Myson is getting on his bike to ride 240 miles (387km) across Andalucia in...
  10. N

    Water Softener unit - Should they be cleaned periodically?

    We have a big water softener unit. Something like this - Water Softener - Ducting Kit - Kitchen Accessories -Kitchens - Wickes The unit was fitted about 15yrs ago. Should it ever be cleaned or serviced? I seem to remember reading somewhere that you can put some bleach in the brine/salt tank...
  11. K

    Sime friendly format e Boiler short cycle?

    Hi Not used to using forums so I'll try my best to give as much info as possible without waffling. I have a Sime friendly format E boiler approx 10 years old. Last week I had no DHW or CH. PCB and pressure swith? where replaced, and since then I have had both HW and CH :D A Diverter valve...
  12. W

    Reverse cycle air conditioning?

    This concept appeals to me,not sure if thats exactly what its called but i think thats it.Basically the hot air you feel coming off an ac unit is used to preheat the hot water/heating primaries and the boiler or immersion then tops it up as I understand it? Never heard of the concept until a...
    • waldomeyer
    • Thread
    • air boiler building central heating system cycle green hot hot water inside reverse supply water
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  13. J

    Boiler on/off cycle 20 seconds

    Hello all, I'm new to this forum as a user but I've been taking some info from it lately. Although I didn't find the answer for this problem: My boiler is a Myson Apollo 40Si about 10 years old. My landlord serviced it almost 2 years ago. Because of the cold weather I changed the thermostat to...
    • JBart
    • Thread
    • appliance boiler buy cold cold weather cycle diy gas gas pipe gas safe guage high hose hot law oil overheat pipe pressure problem radiators safe safety seconds valve water work
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
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