* Posts by Chemist

1991 posts • joined 24 Mar 2010

LIFE, JIM? Comet probot lander found 'ORGANICS' on far-off iceball

Chemist
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Re: Because then we're probably not alone

"I find the idea of very BASIC organic compounds......."

Very basic organic compounds are found all over the place, simple organics form readily from CO, CO2, H2, H2O + energy. There's really no need to have them arrive by comet/meteorite.

(Remember the 'organic' bit doesn't mean LIFE or formed by living organisms - it is just is an (historical) name for carbon/hydrogen based chemistry.)

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Re: Because then we're probably not alone

"If life spreads around the universe it only has to happen once in the lifetime of the universe."

Basically bollocks - maybe true but so, so unlikely - it's a big,hard, difficult universe out there.

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Re: Because then we're probably not alone

"t only has to happen once in the lifetime of the universe."

It's a huge, huge distance to anywhere. Doesn't make it impossible. But at the mo' it's just organic compounds, not DNA, RNA whoa. Wait for the data.

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"Panspermia has some influential supporters, including Prof Stephen Hawking. Researchers have claimed to have found examples of extraterrestrial bacteria inside meteorites,"

Oh, good grief, It may have started somewhere else but so what, you can't keep passing the parcel forever. It had to start somewhere, at some time, why not here ?

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Has your STARFISH been DRIBBLING awful SLIME? Scientists now know WHY

Chemist
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Re: "A method implies an actor"

""sweating is a method used by the body to regulate temperature""

"sweating is a mechanism used by the body to regulate temperature"

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Firefox decade: Microsoft's IE humbled by a dogged upstart. Native next?

Chemist
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"What I believe I've determined is that FF leaks when you open/close tab"

Interesting Vic as I tend to have a lot of tabs permanently open and run for weeks between restarts of OS or FF. Obviously I do open and close some tabs all the time. I've never had any great concerns about memory leaks with FF, although I have had with some programs.

FF is currently using ~50MB less than when I last posted

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"Thus the commentards have spoken."

You are quite wrong (as usual) my anonymous 'friend'. But reading comments here and on other occasions, something is wrong somewhere. Some people have problems with memory leaks or crashes, others don't. Is there a common thread ?.

I use the same version of FF on 1GB, 2GB, & 8GB memory machines ranging from a single core atom & celeron 32 bit to the 64bit machines dual-core AMD & intel upto latest 4 core i7 and have a very similar experience on all (although naturally some are LOT faster than others) . Few crashes and memory usage around 600MB with ~10 tabs open, no obvious leaks. That experience (since ~2006) is limited to just Linux. It would be interesting to see if there is any correlation with OS or maybe it's some hardware thing.

BTW we all know 1080p in 1 bit of RAM is silly.

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"So you repeated browser crashes (once a day for FF is not uncommon) probably go unnoticed."

Would you like an upvote out of pity ?

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"Well if you are running Linux, you are used to patching and compiling your own kernels, as well as spending hours on a command line fixing dodgy software."

BTW I know, anyone who has read reviews on Linux distros (here and elsewhere) knows and I suspect YOU know that you don't need to compile a kernel (or use the command-line to install Linux)

And as for your comment about spending hours fixing dodgy software - beneath contempt !

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Re: Forgetting something Mr Chemist?

"What would one use to download Konqueror or an ftp client or even wget?"

They all come with my preferred OS.

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Chemist
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Re: Ten years and still waiting...

" Ten years and still waiting...

...for a Firefox version that won't crucify a PC with more than a few tabs open."

You should use Linux !

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Re: Forgetting something Mr Chemist?

You haven't got an ftp client ?!!!

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Re: Firefox is the most stable on Android

"Never buying their under-supported crap again."

Not bothering with troll- you are just a (AC) liar

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"Well if you are running Linux, you are used to patching and compiling your own kernels, as well as spending hours on a command line fixing dodgy software.So you repeated browser crashes (once a day for FF is not uncommon) probably go unnoticed."

a) not compiled anything for years !

b) Use the command line a lot - just not needed

c) You are a trol*

c) You are illiterate! (BTW)

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Chemist
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"Constant crashes on Android here as well. Just like on the PC, FF on Android is not fit for purpose."

Oh, an AC with a 'valid' opinion. What possible reason could you have for being that ?. No, thought not

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" without IE, what would you use to download your browser with?"

Konqueror or wget or ftp or ........

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Chemist
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"native beats Firefox because ff crashes constantly"

Well me and mine use FF ALL the time day in/day out and if it crashes it's noteworthy - maybe 2-3 times a year.

Mind that's running all machines (6) under Linux

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BBC clamps down on ILLICIT iPlayer watchers

Chemist
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Re: Get_iplayer still working here

Radio downloads working OK now

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Virgin 'spaceship' pilot 'UNLOCKED tailbooms' going through SOUND BARRIER

Chemist
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Re: "Wealthy customers have signed up in large numbers to see a black sky "

"You seem to have forgotten the recent deaths in the Himalayas ......"

What's that got to do with it. He didn't say climb a dangerous mountain and for that matter the stars against a black sky were magnificent only a mile from Salcombe with our boat tied to its pontoon.

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Snapper's decisions: Whatever happened to REAL photography?

Chemist
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Re: Total light?

@ Steven Jones

I certainly can confirm that my 550D ( love it as I do) isn't a match for my full-frame 6D esp. in noise performance even though the pixel count is ~ the same. Shooting a starry sky, for example, I was seeing far, far more stars without any noise artifacts.

(BTW though some of the finest slides I've ever seen where 21/4 inch Hasselblad photos)

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FATTIES: Boffins say their miracle sunshine skin cream 'prevents obesity'

Chemist
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Re: Bioavailability

" Bioavailability

What you swallow is not what you absorb. Quite a few of the unhealthy foods have high bioavaliability while the healthy ones have lower bioavailability."

I suspect you don't know what bioavailability means. Hint: it's not just the proportion of material absorbed.

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Chemist
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"nitric oxide last week - it helps open blood vessels to prevent high blood pressure"

It's used for a number of control mechanisms in the body. AFAIK (it's mostly not my fields of expertise), there are 3 main mechanisms. One form of the enzyme eNOS (Nitric oxide synthetase ) is activated in blood vessels, I assume under some control, and converts the amino-acid arginine into nitric oxide (+citrulline) . This relaxes the blood vessels. Another NOS, iNOS generates NO by the same mechanism to generate an inflammatory reaction as part of the response to infection etc.

I think, also, that nitrates/nitrites in the diet can generate a background level of NO which may help blood vessel control.

Synthetic nitrites are used to produce a rapid rise in NO levels to alleviate angina symptoms.

But its nature - it modifies the activity of lots of proteins and has a number of recorded effects ( on insulin & airways for example) may mean there are plenty of unknown functions (good & bad)

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Re: Miracle!

"During the first 10 minutes or so of exercise the body burns carbs as fuel, from 10-60 minutes the body turns to burning fat. Normally from 60 minutes + the body will switch to burning muscle as fuel since proteins burn slower and it's slow energy you need."

I think you'll find that this is not correct.

A fit, well-fed individual will have ~~1300 cals of stored carbohydrate, mostly as glycogen, At the start of exercise this will be mobilized to the muscles. On it's own it will provide enough energy for ~~2hrs cycling, however fat mobilization/metabolism which is slower, starts to contribute from relatively early on and becomes significant well before carbohydrate is exhausted. As most people have plenty of fat (maybe 160000 cals) provided the exercise is of a lower order than 'flat-out' fat can provide energy for a long time. Catabolism of protein is a response to starvation in the main, although anyone seriously trying to lose weight by just dieting (i.e.starvation) should try to maintain whole-body muscle fitness by exercise.

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MEN: For pity's sake SLEEP with LOTS of WOMEN - and avoid Prostate Cancer

Chemist
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Re: a study from Canadian health researchers

Re :a study from Canadian health researchers

AFAIK the correlation between frequency of ejaculation and prostate cancer is already well-known.

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Voyager 1 now EIGHTEEN LIGHT HOURS from home

Chemist
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Re: Time dilation

"A constant 1g acceleration would get you to near "

But to get that constant acceleration the energy requirement increase rapidly as ->c

e.g rel. kinetic energy for 1 tonne at 0.9c & 0.999c compared with 'convention' kinetic energy

0.9 ~2E20 J ~3.6E19 J

0.999 ~2E21 J ~4.5E19 J

So an order of mag. increase of total energy required to go 0.9c -> 0.999c

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Happy 2nd birthday, Windows 8 and Surface: Anatomy of a disaster

Chemist
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Re: Snatching defeat from the jaws of victory...

"Last time I tried Linux and attempted to install Firefox I first had to find an installer for the distribution I was using."

Strange that as I've installed OpenSUSE for years (and years) and Firefox was included as one of the default browsers - no need to specifically install at all - that's part of the ease of use of a full-featured distro. Even installing a program that isn't in the distro is often a 1-click job

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COMET 67P is basically TRAILING a HORRIFIC STENCH through space

Chemist
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Re: Hydrogen Sulphide doesn't stink

"Really pure Hydrogen Sulphide is almost as odour-free as hydrogen cyanide."

Do you have a ref. for that ? AFAIK pure hydrogen sulphide is detectable by its smell at ~ 1ppm but at higher concentrations the smell is less or indeed undetectable. I've personally experienced this as walking into a lab full of people I could smell hydrogen sulphide (initially) when the entire room full of staff told me they had smelt it 'a few minutes earlier' but it was 'OK' now. I got them all out into the corridor, tested the air ( with a draeger tube) and the concentration was ~100ppm. A leaking rubber tube was the the cause even though the kit was in a good fume-cupboard.

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It's even GRIMMER up North after MEGA SKY BROADBAND OUTAGE

Chemist
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Re: Well..

"Saas Fee. Dullest ski holiday i've ever been on. (FYI)"

Well I don't ski but I do walk/climb. If I did ski I could do it at the moment - many of the main ski teams are here including Japanese. The Swiss team has >18 minibuses.

I can't see the runs at the moment as there is some cloud ( it snowed last night down to ~3000m )

http://www.saas-fee.ch/en/aktuell/Webcam_Mittelallalin

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Well..

I live in the a very nice part of 'the north' surrounded by many of the areas you attempt to mention although I'm in Saas-Fee, Switzerland at the moment. Certainly my broadband connection is working at home as I've just looked at a directory on my server using fish://

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Microsoft, Docker bid to bring Linux-y containers to Windows: What YOU need to know

Chemist
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Re: It's sounding a bit vague

"Yes, I feel they're at the stage of: "Oh, I want one of those!""

or even " "Oh, I want you to think we've got one of those!""

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Scientists skeptical of Lockheed Martin's truck-sized FUSION reactor breakthrough boast

Chemist
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Re: Clean ?????

"You need a process that creates helium-6 for it to be clean,"

Would you care to elaborate on this ?

AFAIK He-6 has a 1/2 life of <1 sec and decays by both beta and alpha emission.

He-4 is stable and the extra neutron released to form it is the one required to make more Tritium

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Chemist
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Re: Patents

"Isn't half life affected by relativistic effects?"

Sorry, don't understand the context ?

Tritium has a half-life of ~12 years, it's often incorporated into drugs/ligands for studying biological mechanisms and these have a useful working life.

If you send it up to close to the speed of light it's 1/2 life will increase to multiples of 12 years depending on the velocity but I don't know what that's got to do with this topic.

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Kill off SSL 3.0 NOW: HTTPS savaged by vicious POODLE

Chemist
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Re: smug

"Poodletest doesn't get it right with Firefox - it is vulnerable."

It does now - it's been updated.

Also "So in short: Firefox is less likely to downgrade to SSLv3 if the server follows best practices on cipher selection, even if SSLv3 is still supported."

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Chemist
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From ISC

Their current page for this includes links to test sites

For clients it's https://www.poodletest.com/ (Javascript needs to be enabled)

FYI OpenSUSE 13.1 Firefox ESR not vulnerable, SeaMonkey (2.29) not vulnerable, Konqueror (4.10.1) vulnerable

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Lies, damn pies and obesity statistics: We're NOT a nation of fatties

Chemist
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Re: Hunter gatherer much

"Hunter gatherer much "

Summarizing what I've researched about this aspect of diet/behaviour :

Humans still have the basic physiology of hunter-gatherers from 10000+ years ago. It's estimated ( from the nearest we have to hunter gatherers today) that they expended ~~1400 cals average in physical activity every day as well as having a relatively low-calorie diet especially low in simple sugars.

Our metabolism, although wonderfully adaptable, still probably reflects this.

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Re: Don't forget...

Not to mention the parts of the country fed by direct rainwater supplies. Also many of the contaminants people worry about (e.g. growth hormone) don't get absorbed orally.

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@V_Eight

"When quizzing the biologist she said that the calories burned maintaining body temp at the cellular level are next to nothing. Perhaps 100 a day."

I've no idea of the actual figure but AFAIK the bulk of heat generated in the body is the result of exothermic chemical reactions during metabolism - indeed this is why exercise makes you hot as glucose/fats are oxidized at an elevated rate to produce the high-energy phosphates that power muscles. Indeed any fat/glucose not consumed will be converted into storage forms such as lipid stores or muscle & liver glycogen. If the glycogen stores are full the excess glucose will be converted to fat.

BTW It may be obvious but burning 1kg of fat or glucose out in the open air generates the same amount of heat as metabolising it does.

There is some evidence that (some ?) humans have a brown fat that can short circuit the usual metabolic process and generate heat 'on demand' under hormonal or nervous system control. This is separate from the other thermogenic technique of shivering to generate an increased thermal input.

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Chemist
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"My doctor told me my blood pressure and other problems were exacerbated by my weight "

When I started to lose weight my blood pressure was 170/95 and I was determined to avoid medication if possible (ironic since a colleague and I developed the manufacturing route to one of the world's first $1Billion/year drugs for hypertension)

By the time I'd lost 15kg my blood pressure was 155/85 and by my target of 80kg it was 125/80. (Researching the literature in this area has led me to the conclusion that our heterogeneous human population has a very wide spread of BP/weight responses and it looks like I was one of the lucky ones)

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Chemist
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"Exercise is a good thing but as a way of losing weight it's problematic, we are very efficient at converting food to work and muscle."

No it's absolutely equivalent to dieting the difficulty is doing enough of it to lose a large amount quickly. As I mention earlier I lost 35kg by keeping my intake ~2300 cals and upping my exercise to quite a large amount - not possible for everyone I know. I now measure all exercise in calories which not only keeps the arithmetic simple but concentrates the mind wonderfully when about to eat almost anything - this meal needs 15 miles of walking to be calorie neutral.

BTW if we were very good at converting food to work and muscle a lot of people would be star weightlifters. What we are good at doing is storing excess energy as fat. Dieting depletes all body stores : glycogen, fat and lean tissue/muscle. That's another good reason not to lose weight just by dieting.

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Chemist
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Re: And now my turn,

"I'll know more after a week,"

Well done to get started.

A few points. A week is a very short time, body weight can change day to day quite a lot, in my case easily swamping a weeks loss. When I was losing 2-3 kg a week it didn't matter but at lower rates it's easy to be fooled and so disheartened. Best is to plot your weight every day at the same time/scales/position of scales. and then apply an exponential moving average to the plot. This tends to give an indicator of trend. Also when you first cut calories esp. dramatically several confounding trends occur such as fluid loss or retention and esp. a lowering of basal metabolic rate. You may feel cold. Regular exercise should help to boost/maintain your metabolic rate.

For breakfast and lunch I tended to stick to foods where the calories were easy to measure/estimate (cereal/milk, crispbreads/jam fruit).

Problem with most expenditure over basal is measuring/estimating it. You could use a pedometer but even the recommended 30mins brisk walking is only likely to be ~200 cals/day. 1 flight of stairs is only likely to be ~3 cals .

Good luck

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Chemist
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Re: As a fatter person

"sequestered in your adipocytes become unavailable for doing anything. "

Sorry fat makes an important contribution to exercise calories especial endurance. The reason for having adipocytes in any case is to be a longer-term store of energy. There'd be no point if the energy couldn't be used.

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Chemist
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Re: lies , damn lies, and who are all the pies?

"keeping your brain alive burns a big chunk of the 2500kCals/day"

Actually about 200-300 cals/day . There are many sources of ref. but this one should do :

http://www.scientificamerican.com/article/thinking-hard-calories/

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Chemist
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Re: Bollocks

"So am I a statistic"

It doesn't matter ( from just a weight point of view not other health issues) what you eat/drink - count the calories (honestly) in what you eat/drink and if they are over approx 2500 a day and probably quite a bit less if you have a sedentary job then you'll gain weight

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Chemist
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Re: A personal experience

"According to the BMI stuff, that still leaves me about a stone 'overweight'. I disagree."

As others have pointed out BMI is, at best, a 'rough' guide to individuals. It should act as a check - if it suggests you are overweight then look at other measures such as waist size or better still body-fat percentage - this is the real target - a fit individual should have plenty of muscle and a relatively small amount of fat. Unfortunately this is the hardest parameter to measure - most easy measures are poor surrogates for MRI scans.

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Chemist
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Re: OK I admit it

"thought about publishing the data somewhere? "

Oh, it's almost all available if you have good access to the the biomedical literature. The only thing I really struggled with is the value for height gain as there seems to be a wide range in the literature. My final value of 100 cals/100m gain+loss and matches my actual loss rather well.

Another interesting on-line source , esp to an IT audience, is a document by John Walker one of the Autocad founders although he lost weight mostly by calorie reduction.

The Hacker's Diet

How to lose weight and hair through stress and poor nutrition

By John Walker

http://www.fourmilab.ch/hackdiet/

Unfortunately I'd worked out my routine and lost a lot of weight before I found this.

"coming in from a 2.5km run and eating 3 slices of toast and honey - vastly more calories than I have theoretically burned."

You can't treat it like that. You need to know at the minimum how many calories/day will keep your weight steady. Is the toast etc in addition to that basal calorie level. There really is no magic in this for most people long term unless you are one of the 'lucky' ones with lots of brown fat (assuming it really exists/works in humans) or some metabolic issue ( malabsorption of fats for example)

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OK I admit it

In 1997 I weighed 115kg @ 1.8m tall. I decided that enough was enough especially as mountain climbing was getting rather hard

I curtailed my diet to ~2300 cals per day (estimate) and began increasing my exercise. Now not everyone can do it but I live in hilly country and I worked in the country so by walking and eventually running before breakfast, walking at lunch and in the evenings I managed to exercise the equivalent of 500-2000 cals per day. It took 4 years losing some every spring/summer & gaining some over winter.

I still have the spreadsheets going back to then and I carried on until I reached ~80kg which I've maintained ever since.

The equation was actually simple (Estimated calories consumed minus required calorie intake for neutral weight gain minus exercise calories)/8000 = weight loss per day in kg.

The hard part was estimating intake, working out neutral calories for me and estimating various forms of exercise although most (running, cycling ) are available. The hard one in fact was hill walking which I do a lot. My best estimate was 60 cals/km + 100 cals per 100 metres ascent+descent. This may not be all strictly accurate but my weight loss tracked my equation almost perfectly sometimes spookily so.

The 8000 in the equation is cals/kg of fat BTW. The above equation needs to be adjusted for body weight as lowering weight decreases the numerical effects of exercise - if you want to lose 3kg it matters not but in my case it was 35kg or ~40% of my final weight. I still have no feedback when I overeat I have to rely on estimates and scales but now it's become second nature and I can keep my weight ± 2kg.

I have no pride in what I did I'm very sorry it was necessary but I think the message is for most ( probably nearly all people) too many calories need to be compensated for by starvation or preferably exercise. Many people I've discovered have the same lack of feedback to excessive intake and many people have a wildly optimistic view of the effects of exercise. ( a small Mars bar is equivalent to 3-4 miles of walking, sadly a pint needs 2 miles of walking )

Another way of looking at it ; 100 cals extra/less exercise/food every day is equivalent to losing/gaining 4.5kg in a year. That easily goes to explain this 'epidemic'

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I've got a new Linux box, how does it work... WOAH, only asking :-/

Chemist
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"Bottom line is, by the time you get to recompiling your kernel to suit the hardware and get things going, Linux is an amazing platform for getting the most out"

You really expect that most people with any knowledge of Linux would believe this ?

I've not compiled a kernel for probably 15 years and I use Linux (OpenSUSE) all the time on all my machines.

Installs also automatically get the resolution of the monitors correct, even my TV plugged in as a second monitor is recognized.

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Trolls have DARK TETRAD of personality defects, say trickcyclists

Chemist
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"Not an IT department with a confusing name."

Correct, mea culpa - I read IS as IT !

Still stand by the post on that basis though

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Internet Explorer stars in monster October Patch Tuesday

Chemist
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"like the ability to turn off javascript,"

Really ??. What they've done is remove the option in Preferences - it's still an option on the about:config page that's used for masses of possible configuration changes

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