Cells Definition and 450 Threads

Hi there! Could anyone help me out with this question? Which steps should I take in solving this question? Chemical cells can produce quite large charge flows for substantial times before their chemicals have all reacted. If zinc is the metal losing electrons under chemical attack, what mass...

Sex cell? Quick question: Does every sperm cell in a male testicle contain the same genes, or can some sperm cells contain different genes, even though they are from the same person?

Hi! I'm django, new member. Right, I would like to talk about fuel cells. At first glance they are great, right! 99% fuel efficieny. But what most peopkle don't realize, is that although hydrogen might well be the most predominant element in the Universe, it is not available on Earth in...

So my question is what is the difference between these cells? This always confuses me. I know that electrolytic cells are nonspontaneous and that their cathode is negative which means that electrons are going against their gradients here. I am also aware of the fact that a galvanic cells is...

The set S={1,2,3,4}, there are 4 cells. What is the probability for 2 different digits (from S) to appear in 4 cells? Example: 1,1,1,2 =>good 3,4,4,3 =>good 2,4,2,2 =>good 1,2,3,4 =>not good 1,2,3,3 =>not good 1,1,1,1=>not good

The problem http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/animations/CuZncell.html After veiwing the animation found at the website above answer these questions: Is there an electron transfer between species? Which species is losing electrons Which species...

Homework Statement Use half-reactions and E's to determine the result of storing a solution of CuSO4 in a tin container. Homework Equations [Table of Standard Reduction Potentials of Half-Cells] The Attempt at a Solution My question isn't exactly how to do this question. I was just...

In a galvanic cell is it the anions from the electrolyte which is attracted to the cathode or is it the anions produced from the anode dissolving which flow to the cathode?? Also it mentions that the charges increase in energy as they pass through the power supply and they decrease when they...

Hi everyone I need to know where can I buy Peltier cells in internet. can someone help me? Thank in advance

I have an upcoming paper to write for my solar cells course. The question is something along the lines of, if we have a p-n junction which side should we shine the light on for efficiency? Should it shine on the p side or the n side? Efficiency at this point is defined loosely, and can range...

Homework Statement I have got a battery with two half cells. One cell with. A silver rod in a 100 mL AgNO3 0,025 M solution. One cell with. A zinc rod in a 100 mL Zn(NO3)2 0,150 M solution. So my question is what reactions happen? And which reaction is the electricity providing...

I am thinking I should study electrical engineering as well as materials engineering up to a bachelor level; is this a wise plan if I hope to design solar cells. Also, how easily could I collaborate with others to do research in order to gain connections to get such a job, or at least related...

In a http://www.sciam.com/article.cfm?chanID=sa003&articleID=CF2AA0B2-E7F2-99DF-34CD01DE3E68F8ED&ref=rss", it says: What do they mean when they say 10,000 genes "could be active"? What are these genes doing in the brain cell which is interpreted as 'being active'?

I'm a physics student trying to do a project on fuels cells. One thing I don't get is, when the atom goes through the electr-- whatever, how does it separate into electrons and protons. I thought the only way to separate electrons from the nucleus is by extreme heat and pressure, like that...

Nutrients in cells question?? This question may again be too technical but does anyone now how long nutrients used for 'fuel' remain in cells (when they're not being stored - I believe they're only stored in muscle, fat and liver tissue)? For example, if a glucose molecule enters a cell from...

When spermatogonia divide by mitosis, do there telomeres shorten ? I am just trying to ask if reproductive cells age as well as with the rest of our bodies cells ? If so wouldn't a baby born from old parents have a shorter than average life expectancy due to older or more aged DNA ?

My Bio textbook says that, by introducing the virus coat protein gene into a plant cell the cell becomes virus resistant. How is that possible?

I've only taken high school biology and I'm actually a computer science major, but I've had an idea rolling around in my head recently and I think it might be better realized if I approach the problem from a biological standpoint. I'm sort of stuck at a particular problem that I can't seem to...

Greetings! I have read/heard from various sources that none of the cells in my (or any other human's) body now are the same as they were seven (At least one source said nine years) years ago. I remember reading from one source that some cells don't "die" but all of the separate parts are...

Biology Help ! Female cimpanzees often mate with more than one male. The different males' sperm cells race each other to reach the egg first. Both Modja and Tatu have mated with Tanu in the last hour. a) In which part of a sperm cell and an egg cell are the genes found? b) What do genes...

I was checking out diamond anvil cells and i have few questions. I have been on this sites: http://www.physlink.com/Education/askExperts/ae483.cfm (1) http://www.matweb.com/search/SpecificMaterial.asp?bassnum=CDiamA (2) http://merkel.zoneo.net/FEM/index.php?lang=en (3) 1.what is max...

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...