Cells Definition and 429 Threads

There's a common belief that every glass of alcohol you drink kills a certain number of brain cells. This is a myth I thought I'd clear up here, one that results from a severe condition sometimes seen in chronic alcoholics called Wernicke-Korsakov's Syndrome...

My chem teacher is having trouble explaining the a particular happening in a fuel cell to the class. In a galvanic cell +ve ions move towards the +ve electrode and -ve to the -ve. In electrolytic cells the +ve ions move towards the -ve electrode and -ve to the +ve. He says that the reason why it...

Now I'm sure everyone has heard of George w. Bush's veto of the stem cell bill; because killing stem cells is like killing people, even though Bush is pro-death penalty. MY thought. Is it plausable to have a drug, radiation, or whatever. Which stops the meiosis transformation of the diploid...

Hey everyone, I found this really interesting article on Technology Review about a new technology that could remove the sulpur from high-temperature fuel cells. The sulpur causes the eventual shut down of these fuel cells, but with this new technology the cells continue working and are...

i was thinking over how a hydrogen fuel cell works, seperating the electrons and protons (into its ions like any other way of converting electrical energy to chemical) but i wondered if the protons as well as the electrons could be used as a current to creat a circuit such as the electrons do...

So my uncle approaches me today with some investor guide dealy. It takes albout some Power Airtech company and how it is going to introduce some zinc-air fuel cell that they developed with LLNL. Can someone explain the advantages and disadvantages of such a system. They made it out to be greater...

Dear Fellow mathematicians and Physicists,I am doing some MC modelling on tumour growth and radiotherapy treatment modelling and would like to know: Who out there would agree (or suggest alternatives) to the theroy that the chance of a cell being damaged/hit with radiation (and therefore...

i need help on writing redox reactions and with finding the electrode in oxidization and in reduction. oh and what are the three conditions under which the voltmeter reading will be 0 (zero)? THANKS:biggrin:

About an year ago, i had heard a lot about the upcoming technology of fuel cells. i was pretty intrigued by the description that it combined, hydrogen and oxygen to form pure water. no wastage. i believed it would be the alternative fuel we were in search of. why then is there not much...

have anyone of you ever thought of putting chloroplasts into animal cells? What would happen if i did?

Is it possible to make fuel cells that run of ethanol or even sugar? :confused: Is it a good idea? Why/Why not?

:rolleyes: Atleast no one gets hurt(I think..)...Lets hope there's more research on stms cells.

I am trying to do a scatter plot in Excel, and I am referencing points from a different sheet. However, excel won't let me reference more than eight cells. Some of the cells are merged, I don't know if that will affect it... Any help would be appreciated.

The textbook says that every living thing is made up of cells. What about the shell of a crab or egg shells? Are they inert matter or made up of cells? If they are made out of inert matter than how does the organism control their function?

decreases during the stage of mitosis...at which point specifically? Telophase?

Lately in our lab, the DC have been growing more rapidly than usual (4 days vs 6 days). Our lab is new to cell culture but according another lab in our department has the same problem. It appears that the problem is seasonal and it start in early in the fall and ends around christmas. Does...

http://pittsburghlive.com/x/tribune-review/health/s_403491.html

Can anyone list some substances other than penicillian and insulin that are produced by organizms. It seems like most complex molocuels are produced by everything but chemical engineers. Am I correct in thinking that this is because it is very difficult to produce specific complex molocuels on a...

what is the difference between a mineral and a cell? is a mineral made out of cells? what is the chemical composition of a mineral as opposed to a cell (preferably the simplest cell, a unicellar organism)??

I don't understand why these turbulent cells in the atmosphere tend to cause different problems in larger and smaller scale telescopes. anyone who can help me out?

Hello, can you tell me hjow to highlight a cell with IF ? eg IF(A1>100,HIGHLIGHT,NotHIGHLIGHT) <<<<<< somethin like that ? Thank you :smile:

noob, :) just wondering if anyone knows of any sites (links) that show animations of any types of cells doing what they do. thanks jimmie

As I'm watching the PBS presentation about stem cells ( http://www.pbs.org/wgbh/nova/sciencenow/3209/04.html ) and the debate on whether we should use the stem cells for research or not, I wonder what is the chemical make up of those stem cells. It is obvious that it is a DNA molecule, so it is...

When the cells are connected in parallel, what happens to the total current drawn when compared with the arrangement that the cells are connected in series?

Is it possible to make microorganism create nano-objects or nano-machines? Any known experiment? Regards!

If a tumor cell grows with rate m, and dies with rate n (m>n), their population number is P, after tme t, how can set up a mathematical fomuler for growth ? If i also have data from 100 patients, is it useful ? Thanks

A patient caught an influenza for example and the virus is killing him. In his blood, there are fights against the virus and let say, one infected cell can infect also other neighboring cells. Do you know what and how can I set up a rule to calculate the numbers of healthy cells after 't time'...

Well yesterday it was my physics paper(o'levels) . There was a question there which asked what is the advantage of having cells connected in parallel combination? I wrote that By connecting the cells in parallel combination the total current in the circut is shared by all of the cells as a...

Antigen-presenting cells... When antigen-presenting cells (eg - macrophages, dendritics, etc) encounter antigens, do they all migrate to the lymph nodes? What causes them to do this? I know from sources I've read that dendrites do it, but do macrophages as well - or does the macrophage...

what happens if you connect two cells with different emf in parallel along with a resistor in series eg: l---100Ohm--l l-----6V-----l l-----9V-----l

I heard the news and an article is published in Science, but what exactly is the major breakthrough? To me it seems that they have improved on their technique of nuclear transfer (cloning) for extracting stem cells, not that they have created a new way of creating stem cells (the news seems to...

I've got a problem. I tried to see what would happen when putting a fuel cell and electrolysis in a circle. I end up with infinite energy, so I must be doing something wrong. Electrolysis 4 H2O -> 4 H+ + 4 OH- 4 H+ + 4 e- -> 4 H -> 2 H2 || The H2 is lead to the fuel cell anode 4 OH- ->...

Yesterday, i had a 20 minute test on basic nerve cells I could only wruite the main differnce bw nerve cells and other cells in animals is their appearance. One has membrane, round rubgy-shaep while the other has a star-shape. So are there any other differnces i should have mentioned in that...

Are stem cells (used in research) derived from frozen embryos from people who wish to do in vitro fertilization?

Can embryo cells start to differentiate before the embryo is implanted in the uterus? The differentiation usually starts at the time of implantation.

I admittedly do not know a lot about cells...all I know is that they compose life. Now, a cell is made up of thousands of atoms correct? What I do remember from my last bio class was that there are different parts of cells that do different functions. My question is, do the parts of cells...

Hey Everyone :) I'm trying to find out the year on which ~stocks cells~ has been discovered? I'm really not sure about the english word... but in french we call them "cellules souches". I've search a bit on google but couldn't find anything. Edit: Okay I found the correct english word...

Hi, I'm an A level student here in the UK, and have just handed in my rushed piece of coursework on how the incident angle of radiation effects the power produced by a solar cell. Obviously I came to the conclusion that most was produced when the radiation was falling perpendicular but...

Cells in series and parallel... How is emf effected by having cells in series and parallel? I would have thought that for both you would just add the emfs of each cell up, since in both ways you arrange them you are just increasing the attraction/ repulsion experianced by the elctrons in wire...

the New York Times account http://www.nytimes.com/2005/03/24/science/24cnd-dino.html?ex=1112331600&en=5a88279207414f4b&ei=5065&partner=MYWAY the Reuters account http://www.reuters.com/newsArticle.jhtml?type=topNews&storyID=7999945

# Do I need mRNA destabilization signals for my gene expression? If so where should I add it? # It says; "cDNA are often obtained by addition of homopolymeric tails into the 5’ non coding region which should be removed.” Which homopolymeric tails are usually used for this purpose? # Which...

Where should I prepare the media? In the laminar flow hood or on an opened table (risks for contamination?) ?

if a cell line has a maximum of 10 passages before it changes character and i only have done 4 passages of it and made the frozen stock of some of the cells. how many passages does this frozen stock have if i thaw it and passage it? will it be only 6 passages left or 10 passages? thanks for...

if my vector has an amphicilin and a neomycin selection markers. which one should i use for selection of my mammalian cells? thanks.

how should the lid be when i incubate my cells in: 1. multiwells: should i tilt the lid so that half of the plate is covered and half is exposed directly to air in the incubator? or should i just have the lid on so the whole plate is covered? 2. culture flask: should the lid be loosened...

why the rate of glucose consumption dectrases when yeast cells cultured under anaerobic conditions are exposed to oxygen? :confused: :confused: :confused:

What is the by-product when skeletal cells respire anaerobically ?

This is an activity to get an introduction to sequences and series it said every hour cells divide It said there are 500 cells now how many will there be in an hour I wrote 1000 cells It said to make a table for 5 hours so I got Hours--Cells 1 ----- 1000 2-------2000 3-------4000...

When power is generated in a solar cell, it is because of irradiance of radiation on a pn-junction. But in which part of the junction are the electron-hole pairs created? Is it just the depleted region or are they also created in the n- and p-type semiconductors? An engineer's response...

Hi, Why is it better for a cell to synthesize polymers such as proteins carbohydrates by linking together monomers than to synthesize them from scratch> I believe it is because it would take too much energy to link them together from scratch. Since they already have these monomers the...