Cell Definition and 899 Threads

1. Homework Statement I have a class in grade nine geography and as our final assignment we have to pick a topic on things that effect Canada. I picked stem cell research, got my info, but I have no idea of what to make the model. I tried thinking of everything, I'm in academic and for me to...

Hello, I must first say that I think this is an excellent forum, I have found some usefull info in the past.(thanks) The question I have today is about loadcells, I am working in my companys R&D department I am trying to set up a pair of load cells to measure tension. The load cells I am...

Homework Statement All I'm trying to do is translate the cell diagram below into a into a an equation so I can determine which is the anode and which is the cathode. Here is the cell diagram. I know how to balance it, I just want to make sure I'm putting reactants and products on their...

i read about a month ago that cell phone charging is about to be 'revolutionized.' Apparently, cell phones of the near future will have a wireless charging system where you plug a radio transmitter into the wall, and the cell phone receives the signal and uses it to charge it's batteries. My...

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 0.0730 V exists across the membrane. The thickness of the membrane is 8.22E-9 m. What is the magnitude of the electric field in the...

A while back, I purchased a 38W peltier cell on ebay. It wasn't powerful enough, so I'm looking at something along the lines of a 92W. I noticed, however that my 38W and the 92W have the same dimensions and the same number of junctions. Also, dT of the 92W is only 1 degree C above the 38W...

Just read the title. That's all I want to know.

I want to understand that why does the internal resistance of a cell/battery goes on increasing as the cell gets older. What happens inside the cell that causes the internal resistance to increase gradually? Thanks.

Most batteries have a low voltage output like a lead acid +- 2.2V per cell And carbon + zinc have something like 1.5V and so it goes on. Can a battery have a high output voltage without putting it in series Example: I want a battery with 100V DC output per cell, does that exist or not...

I have this homework question I can't quite figure out. Any help is greatly appreciated. In direct sunlight, solar cells have a power density of approximately 15 mW/cm2. Suppose a sensor node consumes on average 10mW of power. How large of a solar cell array is needed to meet this...

Hi Guys, a quick answer will be great! Just wanting to know, what are some of the factors that affect the voltage of a galvanic cell?

Homework Statement If 3.50 x 10^-3 kg of gold is deposited on the negative electrode of an electrolytic cell in a period of 2.99 h, what is the current in the cell during that period? Assume that the gold ions carry one elementary unit of positive charge. (A) Homework Equations I =...

im meant to design an experiment (at AS level) and perform it to see how the pH can affect beetroot cell membrane permeability. i don't know where to start. anyone have any experiments?? thanks :biggrin:

If the EM waves emitted by a cell phone and a microwave oven have similar frequencies, what does it mean that the waves emitted by the oven contain more energy? I believe that a microwave oven generates about 500 watts, whereas a cell phone generates only about 2 watts. What exactly does that...

Is it true that cell phones can be harmful to a person's health?

These guys dress up like giant cell phones and then attack and destroy other people's cell phones. :smile: :smile: :smile: http://www.phonebashing.com/ If this is for real, there will be a judge who will also find this tremendously funny. They may think this is fun and games, but it is...

I'm confused about the ability of neurons to repair themselves. My understanding was that most tissue was repaired not by 'mending' individual cells but by creating new cells by cell division (and that most types of neurons don't actually do this) and that cells just became more worn until...

http://multimedia.mcb.harvard.edu/anim_innerlife_hi.html

need some help please :) Had major paper due today, didn't have much time for my physics hw, and now I am stumped on some. Anyone got ideas, I have to turn it in tommorow! Thanks for any help you can give! 1. A microscope has an objective lens with a focal length of 16.22mm and an eyepiece...

My attempts to derive the height as a function of radius of the spheres packing the unit cell have failed. The best attempt so far was to create a diagonal line from the top atom to one of the middle ones. With that distance I thought I could use trig to find the component parallel to the height...

In Chlorate cell should i run 300 Amp by DC Converter 300 AMP to make Chlorate in short period?

What's the difference between electric cell and electric circuit?

Hi, I am trying to do coursework on measuring the internal resistance of a solar cell. The light intensity on the solar cell is not going to change so the only thing that can be changed is the resistance as a variable resistor is used.But I am not sure how to find the internal resistance when I...

In my school we are developing and investigating the process of generating electricity by means of an hydrogen fuel cell. We have started with an aqueous solution of NaCl and connect it to a 12 volt generator. Then, we waited for 3-4 minutes and disconnected it from the generator and connected...

anyone help me out, please. can anyone tell me the "problems a cell would encouter if this structure ceased to function"?(what would happen, if Golgi apparatus did not exsist)

Hi, how long does a cell, normal and cancerous, live outside a living host? Thanks, Aoiro

i recently read in a popular science magizine about a guy inventing a substance that was like a "scafalding" for atoms. that the atoms (gas state) bonded to this structure (assuming this scaffalding is microscopic) making it "semi-solid" i don't know what you would call it. but what if you did...

...this might happen to you! :mad: http://youtube.com/watch?v=hut3VRL5XRE

What does the model number of a cell phone stand for? Does it have a special significance? eg: nokia 3310 or sony k300i?

http://www.nytimes.com/2006/08/24/science/24stem.html?ei=5090&en=b2d5fa804870604d&ex=1314072000&adxnnl=1&partner=rssuserland&emc=rss&adxnnlx=1156554793-b82hPYSiVvSMmyaDSW1cDA Good news but I am afraid it will not help the political debate

My Sony Ericsson T200 cell phone is ~4 years old. (I know, vacuum tubes and dial knobs). It is no longer made. Thus, they no longer make the batteries either. My battery's life has become quite short, lasting only a day or two without use (it used to last all week), so I'd like to replace it...

I just started reading about Donald O. Hebb and his theories about cell assemblies. I am stuck on something really simple. From what I have read, if two neurons have a synaptic connection and they fire simultaneously, then that connection will be strengthened. What I can't understand is this -...

I had to make a galvanic cell for my chemistry class and it was supposed to have a voltage of 2.3 but for some reason it only was .5. My cell was comprised of a iron and aluminim electrode with the respective nitrates.( potassium nitrate salt bridge) it was wondering if anybody knew why it would...

How many atoms could fit inside a human cell? "A person's body is actually made up of trillions of cells (source: Science Concepts - Cells by Silverstein)", but how many atoms could fit inside a human cell? 125 million atoms could fit inside the period at the end of this sentence. But how...

Is it it safe for electronics in physics labs (spectroscopy devices, lasers, AFM, Teraherz microscope) to use: - cell phone - radio - mp3 player Can they cause any noise in electronics and distort signals from photon counting detectors or influence lasers somehow? I'm asking because our...

I don't really know the principles of this technique despite doing some reading: the cell patch is destroyed, and the contents of the cytoplasm can mix with the contents of the electrode. there is a low resistance pathway - so what? and how can measurements be made if the membrane is...

I thought a cell phone sent messages at the speed of light, but I was told that much of it goes through wires and not the atmosphere. How do wires effect the speed, and does it mostly go through wires?

how do i make a fuel cell which utilises hydrogen and oxygen to make water and in the meantime give out loads of heat. is it possible?:

Dang Tree hugging cell phone! This stupid cell phone! The battery discharged in under 24 hours of simply being on standby! :devil: :devil: :devil: :devil: :devil: :devil: I hate everything. I hate life. I'm going to commit suicide. Wait cyrusabdollahi would like that. I plan on living...

http://en.wikinews.org/wiki/Former_Yugoslavian_president_Slobodan_Milosevic_found_dead_in_his_cell http://news.yahoo.com/s/ap/20060312/ap_on_re_eu/milosevic The war crimes trial of Milošević was drawing to the end when he was found dead. So the rest is academic. There are still...

Hello I would like to find some texts or web sites explaining how and why activities can be measured with a Knudsen cell. What is measured and how the Gibbs energy is deuced from the measurements. I would also like to find out the range of application of this method, like for temperatures...

Did anyone happen to catch the 60mins TV spot of Hans S. Keirstead last night? His research showing reversing spinal cord damage in rats using human embryo stem cells is compelling. Brings this approach to humans paralyzed by spinal cord damage, closer to reality. Human clinical trials may...

Does anyone know how to do this problem? I cannot find any examples in my book like it, and I have gotten no where in a full hour. If 3.9x10^-3 of gold is deposited on the negative electrode of an electrolytic cell in a period of 2.67 h, what is the current in the cell during this period...

what's the difference between those two?

Has anyone experimented with this? Take 2 stem cells. Take the DNA portion out of the one cell and place it inside the second cell. using the same method that the cloning stuff does it. Or would this method basically just cause mitosis to separate the cells anyway. or would it just kill the...

Hello all, I am reading some primary literature in which they talk about cell adhesion and cell detachment. They describe different assays for each. My question is, how are these two different? It seems that high detachment is the same as low adhesion, but according to the article, for a...

You are accostumating me bad. I never find good sites for what I am looking for and you always find. This time I am looking for the various theories about the structure of the cell membrane till the fluid mosaic. Thank you one more time. :biggrin:

is it true or not its supposed to be an urban legend that you can cook an egg with your cellphone. the same way that a microwave cooks an egg but a lot slower because of the power difference, 1500 to 3 (watts). i was wondering if the cell phone frequency was even high enough to be caught by...

I want to do master research in UK abuot cell biology, which school rank between 5th~10th( to 12th is also ok) about cell biology in UK. thanks

Neurogenesis in Protracted Abstinence from Alcohol. Nixon, K., Crews, F.T. Journal of Neuroscience 2004, 24(43):9714-9722 http://www.jneurosci.org/cgi/content/full/24/43/9714 Here's article number 3. My testing shows that it should be available freely to all, let me know if you have...