Cell Definition and 899 Threads

what do you think?

Question Electric potential inside a living cell is 0.075V lower than the electric potential ouside the cell. Thickness of membrane is 120nm. a) What is the magnitude and direction of the electric field within the cell membrane? Possible Ans: Is this just use the forumula E = -dV/ds =...

I got to learn this stuff for my fuel cell project. Anyone know any good websites on it?

http://news.yahoo.com/s/nm/20060109/lf_nm/thailand_stemcells_dc

Here are the descriptions of two of my designs. ET1: Turbine and Electrolysis System The Turbine: I have used the water vapour exhaust of a PEM fuel cell to run a turbine to make electricity. After the water vapour has passed through the turbine it goes to electrolysis system. The...

NEED HELP! what is the difference between a fat cell and a lipid?¿? lipids are said to be molecules! so why are they also called fat cells. cells are only cells when there is cytoplasm, a cell wall, one or more nuclei, and various organelles, all surrounded by a semipermeable cell...

Cell phone etiquette has hit a new all-time low. Now people can't even stop talking on their cell phones long enough to rob you. Cell phone bandit

Which mobile do you have?? And And Which factors did you considered while buying your mobile phone like brand,look,size etc. etc.

What do you think? [edit:are you in favor of embryonic cell research or not?]

Ok so at what point do you draw the line when it comes to children having full blown full featured unmonitored cell phones? Personally, I'd make cell phones equivalent to alcohol. You'd need to be 21 to own one, excessive use in public would be an arrestable offense, and giving a cell phone to...

How much are graphite plates? I need them to build my fuel cell.

Quote: Originally Posted by Artermis Hello Moonbear, I don't know if you know me but I'm a relatively new member but I know that you are very knowledgeable and helpful, hopefully you'll be willing to help me with this. Hi, I've seen you in the biology forum recently. Glad to have you...

Where can I find science journals online regarding Stem Cell Research??

When a cell replicates itself, where does it get the matter to do so? I mean, cells can't just makes copies out of nothing, right?

People are trying to make us live a really really long amount of time by perfecting cell regeneration right? I was just wondering, thanks

cell membrane---please help me...--- [FONT=Verdana] :confused: What kind of molecules make up the majority of the cell's membrane? :confused: Can anyone help me?

The membrane of a cell is electrically equivalent to a parallel plate capacitor. A typical cell has a spherical shape with a radius 10 μm and it has a potential of −60 mV with respect to outside. The thickness of the membrane is about 0.01 μm, and it has a dielectric constant of 2. Find: (a)...

Don't you? After having a cell phone for about 3 years, I have realized that I am sick of them. I hate having to take calls and talking to people. If I'm not home, what makes people think I want to talk? All talking should happen in-home with a big handlebar up to your ear and a cord running...

driving while drunk is safer than driving while talking on a cell phone, according to Mythbusters.

So how effective are these beads? Which dimensions would be optimal for radiation blockage? I'm understanding that the article assumes that radiation from the cellphone itself would appear to be reduced because the user has a headset and so the phone would be distant from the body. So the...

Is it possible to modify a pair of GSM cell phones to work as Transmitter and Receiver without Service provider (Network)? If so how to do it??

I am working on trying to get a reliable power supply primarily for my Electrolytic Cell, and secondly for any other power supply needs that should come up. I have pretty much concluded that a computer power supply will suit me best. In the past, I hav been using a AT power supply, but I...

Hello everyone. I am having trouble with a question on electrochemical cells. I have to find the balanced REDOX reaction of the cell. All I am given is a diagram with the following information 1. Aluminum electrode submerged in 1 mol/L Aluminum Nitrate Al(NO3)3(aq) 2. Nickel electrode...

I found a website with some amusing comments about cell phones: http://www.molly.com/2004/05/11/cell-phone-stupidity-part-1/ Here's more on the same subject: http://www.etiquetteexpert.com/news_article_june_03.htm http://www.etiquetteexpert.com/cnn_live.htm The two links to...

i've been asked to explain the observation of sickle cell anaemia which is caused by a recessive point mutation in the beta chain of adult haemoglobin, but foetus homozygous recessive is not affected. why is that? i have been told that foetus has haemoglobin gamma not beta and therefore can't...

SO32- +MnO4-1+H+1 <-> Mn2+ +SO42- +H20(l)

The hydrogen liberated at the cathode would coat the electrode so polarises the cell. And manganse (IV) oxide is used as a depolariser. I got an equation in my notes: 2MnO2 + 3H2 --> 2MHO(OH) + 2H2O. But evidently the oxygen doesn't balance. I tried looking on the internet but still no...

1. I have to calculate the voltage of a standard cell with the following half-cell reactions: Ni(s) ---> Ni2+ + 2e- 2e- + Cl2(g) ---> 2Cl- 2. By the electrolysis of water, 11.2L of oxygen at STP was prepared a) What charge was required? b) If a current of 0.5A was used, how long did it...

I am trying to understand the chemistry cell thoroughly. 1.If there is only a copper wire connected to a multimeter, there should be no voltage, isn't it? 2. For the set up of a zinc electrode and a copper electrode, will I get a larger voltage by changing the electrode? Such as a more...

I'm going to turn 17 soon, the legal age at which one can donate blood in my state, and I plan on donating blood soon thereafter. Being that I've never done it before, and I'm not tremendously active (thus don't have a particularly strong heart, thus figure that losing a relatively small amount...

What changes would have to be made to a cell so that when it divides the genes in the daughter cells are exactly the same,in the same order and number on the chromosomes, as they were in the parent cell?

Hey guys For those who have seen HHGG, that sweet white Nokia cellphone that Arthur Dent has, does it exist? If so, does anyone know the model #? Thank you Aychamo

Could a tumour cell be killed in a person by making the cell membrane too permeable to water and so causing tumour cells to swell and burst.Perhaps active transport of some kind would be needed to do this?

An embryo can increase its cell number without increasing its overall size.Is this because cell growth is actively inhibited?

I just wanted to start this thread about the risks of using cell phones. Today there was a new story in the BBC http://news.bbc.co.uk/2/hi/health/4432755.stm This can only make me laugh since the wavelength of the radiation can in no way affect the cells in the brain. What was this Swedish...

How and why do mobile phones and wireless devices cause harm?

Which of the following types of cells would you expect to contain a high density of cytoplasmic intermediate filaments? A) Free living amoeba (the answer is no, but why? Is it because the amoeba has to move) B) Human skin epithelial cell C) smooth cell in the digestive tract of a...

This is a 'why' question: When my phone (GSM, Tmobile in the US) is sitting next to my monitor, or by my radio in my room and is about to receive a call/msg, and while sending a call/msg I get a lot of interference on my radio and monitor. But as soon as the call is in progress, the...

• Why should some Poly-A sequences lay upstream of a reporter gene? • Isogenic cell lines? • Null cell lines? Any ideas are greatly appreciated.

I have a problem that in my physics textbook, a source of EMF is just shown as a box having + and - terminals. The inner workings of that box need not be considered. They claim that although there is obviously an electrostatic force Fe due to this separation of charge, it is countered by a force...

This is something that I have been thinking about lately. :rolleyes: I wanted to address it from a biological view, not a political one. Stem cell research is very contraversial, not only in the political world, but the biological one as well. I was curious as to what everyone here had to say...

How many biologists recognize that the cell is a biochemical computer with molecular memory? I don't mean it is similar to a computer or analogous to a computer. The cell is one design that might be chosen by someone building a molecular level self replicating computer, particularly for...

# How do I know the minimum of cells for a specific cell line that give a quick entry into log phase growth? #If medium with serum contains trypsin inhibitor. What should I use to dislodge my cells? #Should I always have HCO3- in the medium and what for? # Should pH always be between...

Anyone out there have a general idea/range of the weight of a typical eukaryotic cell? I found that E coli is at about 665 femtograms, but I'm more interested in mammalian cells.

I have been asked to describe the pathway the following types of proteins follow and where they are synthesized in the cell. (a) Soluble proteins meant to remain in cytoplasm- Here wouldn't this follow the pathway cytoplasm-ER-golgi-exocytosis\ (b) membrane proteins meant to remain...

hi, my textbook shows how cholesterol sort of patches the cell membrane together, keeps it at optimal fluidity... I was just wondering how cholesterol is able to do this... I am in grade 11 biology I am not being tested on this or whatever I was just wondering if anyone knew...

If red blood cells don't have nuclei, then does this mean we can't find DNA in blood? Thanks

I have been reading about the new cell processing that would be used for the PS3. I was wondering when it would be available for regular computers and what price range you think it would be in. I was hoping to build a very nice computer before I go off to college next year, but I am kind of...

Can anyone correct me if I am wrong? This is basic basic basic basic basic basic biology, and i am just trying to refresh my memory and make sure that i am stating the correct facts 1) General concepts about tonicity ---- Lets say for example, we have a red blood cell exposed to solutions...

there are 2 probs here. 1) The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.0680 V exists across the membrane. The thickness of the membrane is 7.95×10-9 m. What is the magnitude of...