Cells Definition and 450 Threads

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...

I'm guessing that our history class is (in the next couple of days) going to break out into a huge debate about evolution. In order to quell the usual outburst of completely illogical and factually incorrect arguments that will come up, I want to learn a few basic things about chemistry, mainly...

let's say we have an electrolytic cell with a copper (II) nitrate solution. a copper rod is the anode and a lead rod is the cathode. Are these the reducing and oxidizing agents? RA: NO3- Pb(s) Cu(s) OA: Cu2+ Where would water go? and what are the strong reducing and...

Ok so right now the best solar cells get only about 20-30% of the energy available to it from the sun. This is because for each photon that knocks off an electron, any excess energy not needed to knock off the electron in the silicon is wasted. And I read in howstuffworks.com that really good...

Hello, everyone. I have a project for science fair that I would like to do, but I need verification to see if this will work like I think it will. My experiment's name is "The Effects of Electricity and Configuration on an Electrochemical Cell". It's wordy, but what can I do? Anyhow, my...

I just read the cover article in the most recent issue of Scientific American about viruses. The article was pretty interesting; it gives a short overview of the basics of what viruses do and how they do it and talks about their role in evolutionary history of organisms. The article also...

Cells and their membranes-the lock and key So in biology we were discussing cell membranes and the effects and processes viruses impose on the cell. Take lytic infection for example-in basic terms attaching to the cell, using one of the cells protein channels in the phospholipid bilayer and...

Hi! If I could get an answer to this question I could understand biology a lot easier. In the cell interior, the endoplasmic Reticulum manufactures proteins and are then transported by a vesicle to the Golgi Apparatus where they are modified or processed and sorted. My question is, ''how do...

hi guys! what types of cells is a mammalian cell? i know this is maybe a "horrible" question, but i find it hard knowing the different cells under this category cell. i have looked in the net, but don't find any site where they explain about this type of cell. so hope for some ideas...

Which organelles do mesophyll cells have more than root cells of a plant? Do Onions have chloroplasts?

i just learn that before a lady have an embryo in her body, one male sex cell swims into her egg, but right before entering, the cell will cut itself its tail and destroy its head, only the part containing dna falls into the middle of the egg. i am wondering how can the that sex cell knows it...

can somebody help me with the following question? What is the role of enzymes inside cells? please help it would be much appreciated :confused:

can some one tell me what tissues and cells the lungs contain, the lungs function and how the lungs have adapted to carry out this function. please help :star:

I'm having trouble find the total resistance of circuits with cells in parallel. The answer in the book is 31 ohms, but my calcuation ends up as 30 ohms. What am I doing wrong? (Please show steps if not too much trouble) Thanks in advance!:D See this site for my work and a diagram of the...

My chemistry book says it is impossible to use anything but hydrogen in a fuel cell, but does not say why. does anyone know why?

I just learned that cells can divide themselves to develop to higher levels, but I am wondering as to why they can divide themselves, or to be clearer about my wonder, what factors contribute in the division of a cell ? A catalyst can accelerate a chemical reaction's speed, what enzymes can...

Just curious if antibiotics you might put on a band-aid over a wound that risks infection could kill/harm the skin cells around it.

Does anyone know anything about thermionic cells? I have the basic of how they work, but am curious about the details.

Does anyone have any hands on expierence with Hydrogen fuel cells used as the backup source on UPSs.

Being fairly new to the whole fuel cell thing (or at least how it works), I have a couple questions. I have learned so far that Proton Exchange Membrane (PEM) fuel cells work using the following device and process: * Why must the hydrogen be combined with oxygen at the end of the process...

I found this article rather interesting. I don't know how wise extending the reproductive age of humans would be though. There are other health risks to older women. Once Thought Impossible, Study Shows Adult Mice May Generate New Eggs "A half-century of conventional wisdom in biology...

Does anyone know the molecular detail of how it works? http://micro.nwfsc.noaa.gov/protocols/rbcl.html It is a method to make E. coli cells competent so that they are willing to take up DNA from their environment. So I guess the RbCl disrupts the plasma membrane in a certain way.. but why...

Hi all, Before I ask a Q about blood cancers, can I just check - is it right that cell division of blood cells takes place only in the bone marrow (and not in the bloodstream or anywhere else)? Thanx Charles

1. Acetone has normal boiling point of 56.5 oC, and heat of vaporization of 32.0 kJ/mol. Find the boiling point at 580 mmHg. 2. Given element, its structure and density, find its atomic radius in pm. Cr, body centered cubic, 7.19 g/mL. Well, as for question 1, I'm totally stumped...

found an interesting article on new stem cell research: "La Jolla, CA. December 22, 2003—A group of researchers from The Scripps Research Institute has identified a small synthetic molecule that can induce a cell to undergo dedifferentiation—to move backwards developmentally from its current...

Our immune cells are able to squeeze themselves through cellular barriers such as the lining of blood vessels and bowel epithelium. I am wondering: how do they do that, exactly which cells do it, and are they also able to go through tight junctions?

Hey I got the oppurtunity to work in a research lab that focused on CadTel solar cells this summer and learned a fair deal about them, I also intend to take a class on Photovoltaics in the spring but I was just wondering how people feel about the cadmium in cadtel and would love some more...

Does solar cell really only absorbs energy from sunlight? What about other sources of radiation such as thermal radiation? Wouldn't it be great if there are some devices that can recycles energy produced in major cities and convert it into electrical energy?

Immunology is not my best subject, anyone care to lay out the basic principles of the different immune cells?

http://content.health.msn.com/content/article/72/81660.htm i found this quite interesting that anti-depressants help the activity of increasing brain cells...