Cell Definition and 899 Threads

In my reference textbook , it was written that while making a simple voltaic cell , Alessando Volta took an electrolytic cell made of glass ad partially filled it by dilute sulphuric acid acting as an electrolyte. Then he took a bulb (or any other resistor) or galvanometer of 1.08 V and...

Homework Statement Calculate the cell potential (ECell) of an electrochemical cell with Mg/Mg^2+, and Fe/Fe^2+ electrodes. [Mg^2+] and [Fe^2+] = 1.00 M. Fe^2+(aq) + 2e^- --> Fe(s) = -0.45V Mg^2+(aq) + 2e^- --> Mg(s) = -2.37 V a) 1.90 b) 1.92 c) 1.94 d) 2.82 e) 2.80 Homework...

Homework Statement Design a solar cell, designed to absorb solar light. Treat the sun as a blockbody source of T=5800K. To design the cell, you may grow 4 very thin semiconductors of the following bandgaps, in eV: 1.43, 1.14, 1.35, 0.67, 1.75, 2.4, 2.7, 0.42, 3.37 Which of these would you...

dear experts i saw a solar charger the size of an iphone that has high amperage rating of over 1000mA to 2000mA. Based on the solar cell size i estimate it to produce at most 250mA at around 5 volts. I like to know how the high amperageis derived. is it using super capacitors ? if...

I am a year 12 student and would like to make a small model for my project. I want to make a house which will be controlled my your laptop or a cell phone. The house should have the following features installed. -should have a gate sensor (i already have made a gate sensor with a scale)...

Does anyone think that it's possible to have a perpetual motion machine electricity generation of a combo of a light bulb shining light on photovoltaic cells that are connected to power increase transformer coils to power that light bulb? I suppose there would have to be some kind of way to...

Tamir S. Aldad, Geliang Gan, Xiao-Bing Gao, Hugh S. Taylor. Fetal Radiofrequency Radiation Exposure From 800-1900 Mhz-Rated Cellular Telephones Affects Neurodevelopment and Behavior in Mice. Scientific Reports, 2012; 2 DOI: 10.1038/srep00312 Thoughts on implications for humans?

The potential at which a metal is deposited in the electrowinning process can significantly affect the quality of the deposit. The potential itself can be dramatically affected by the addition of complexing agents and by adjusting the pH of the solution as the following calculations demonstrate...

class intList { int value; intList *nextEntry; intList *reverseM(intList *prev); public: intList(int v, intList *next) : value(v), nextEntry(next) {} intList *reverseM(); intList *removeNthM(int i); // remove the ith element from the list int length(); }; intList...

Integrin-PI3K-Akt signal transduction is well known. Akt signaling has been heavily reviewed and is well known to play a role in metabolism. So why do I have difficulty finding any research that has linked cell adhesion to metabolism? It would make sense. If a cell became cancerous, one way...

Hello Forum, a lattice is a set of points. We can place a basis at each set of points. The basis can be one atom or a group of atoms. I thought that a translation of the basis would produce the whole crystal... How is a basis different from the unit cell? Are they the same thing...

Hello Forum, I am trying to perform a solar cell experiment. I went to several websites and they list their small solar cells panels as having an output of 0.5 volts, 100mA. The cell size is 1 3/4" X 1"... Does 0.5 V represent the open circuit voltage, when the cell receives the max...

How does concentration of solution (So42) affect the voltage in a electro-chemical cell?

I don't happen to have any welding equipment available to me, so I have decided to make an oxyhydrogen welding torch. That basically involves splitting water by electrolysis, running it through a tube with a blowback arrestor and burning it on the other end. I have read that the voltage should...

Hi. I am currently doing an experiment regarding to the factors affecting beet root cell membrane. Some of them are pH (2,4,6,8,10) , Ethanol (1%, 25%, 50%) and Detergent(1%, 5%). I've seen that different pH, different concentration in ethanol and detergent each has different results in both...

Hello neuroscientists, I'm currently working on a neuroscience project and in the course of the papers I'm reading, I keep coming up against the phrase "principal cell layer". The papers I'm reading are about the hippocampus. I gather that this has something to do with the presence of...

Homework Statement Line Notation Fe | Fe^(2+) (0.587) || Cd^(2+) (1.009) | Cd T = 297 K E(cell standard) = .04 V Find the potential when [Fe^(2+) changes by .393 M Work Cd^(2+) + Fe --> Cd + Fe^(2+) Q = [Fe^(2+)] / [Cd^2+] Q= [.587 + .393] / [1.009-.393] The Attempt at a...

Hi all, i'm currently working on a project but i need to find a way to count bacteria i have to be able to tell the difference between 10^4 and 10^5 bacteria/mL. This should be done optically but I'm open for any suggestions. I have read something about optical density and flow cytometry...

Homework Statement The electrochemical cell: SCE // CrO4 2- (x M) / Ag2CrO4 (s) / Ag (s) is used for the determination of CrO4 2- . The standard reduction potential for the reaction: Ag2CrO4 (s) + e = 2 Ag + CrO42- is +0.446 V vs. NHE. (b) Which of the...

Hello, I've been toying with the idea of making a cheap dynomometer for small electric motors, but one of the obstacles I'm encountering is finding a cheap load cell. The best I've done so far is a $75 sensor from Omega, which still requires conditioning. Then it occurred to me that you can...

hi i was wondering if somebody of you knows something about this stuff? it is about an electrochemical cell that is made of zinc and copper in sulfuric acid. now the reaction is: Zn-> Zn(2+)+2e- 2H+ + 2e- ->H2 my problem is, that i do not know whether this...

Didnt einstein show that the work function depends on frequency not intensity? If so, than why does the Wysips cell use a magnifying array? Sorry i don't have a pic, but a diagram of the solar cell may be found using google images.

Hello! I am confused about this circuit representation. I am not familiar with how it works. I was under the impression charge cannot flow across a capacitor (a wire is required). So how does charge move in the following circuit? Not across the battery - since the charge is supposed to be...

The ribosomes have a membrane to prevent damage of the cell from the enzyme. but why are the cells not damaged when the enzymes are digesting unwanted structures, since the enzymes have to be released to digest unwanted structures.

Homework Statement Are phospholipids cholesterol?Because in one book it says that ' cholesterol molecules, like phospholipids'. I am a little bit confused. Homework Equations The Attempt at a Solution

Homework Statement Can someone give me an answer to the problem stated below I'm rather quite new to the area of solar... "Outline the process of producing the photovoltaic cell?" Thank You very much for answering!

Hello, I need help understanding how exactly cell phones work, like the channels, frequencies, and grid system. I researched a lot but still don't get it, could some one please dumb it down for me :$ I need help ASAP b/c I have an assignment due tmrw. Thankyou so much. Basically, just talk...

I built a cell with one side containing the solution 0.10 M CuSO4 with Cu(s) in it. The other side has 1 M NH3 and 0.05 M ZnSO4 with Zn(s) in it. The measured cell potential was 1.31. I am using the Nernst equation. I need to find the concentration of Zn^2+. E=E"-(0.059/2)logQ 1.31 =...

Homework Statement I'm a sort of a newbie student studying solar cell for 2 months and having my test next week, so I've in need of help here! 1) Identify the majority and minority carriers in p-type silicon with n-type silicon solar cell? 2) Explain the term diffusion and drift current? 3)...

Quantum "Cell Phones?" Earlier today, I was thinking, what if we could use Quantum mechanics to have lighting fast cell phone access? How it could work is you could have one particle in the Cell Phone tower (which could now be just a room.) That was entangled with the particle in your cell...

Hi, I am an engineering student, and I have an idea for a project, but I am not sure if it is viable. I want to make an article of clothing such as a jacket with several mini faraday flashlight-esque devices inside. They would be connected, and would charge a cell phone or other electronic...

Fuel cells means chem engineering, right? (move to the right section if necessary) Anyway this sounds great, except that it still uses gasoline: http://www.technologyreview.com/energy/39203/

I have been following this story for awhile, and since no one is reporting it, I thought I would post, because I feel you should be aware of what you may be subjected to when you use your cell phone. Have a look, comments, disbelief, outrage...

Homework Statement I attached a picture and I am confused by Part C. The standard potential is given Eo=1.21 Homework Equations Ecell=Eocell-RTlnQ/nF R=8.3145 T=298.15 F=96485 Q=activity products/ activity reactants The Attempt at a Solution My problem with this question is...

I just replaced my old Nokia cell phone with a new Samsung phone about two months ago. I loved the voice quality and reliability of my old Nokia, but they don't make them anymore, so I settled for a Samsung with a small keyboard. I use TMobile and in general have been OK with their service...

hye guys... i need to do some design which need me to use S beam load cell as gravity sensor...anyone have ideas about my project?

I'm given a fuel cell that uses methane as fuel: (CH4) + 2(O2) --> 2(H2O) + (CO2) And I'm asked to find (a) the electrical work I can get out for each mole of methane, and (b) the amount of waste heat produced. I understand that ΔG is defined as the amount of useful non-mechanical work...

How are cell membranes enlarged? What is known about how this process is controlled? How might I read more about this topic? I am mainly asking about animal cells.

My son is a 3rd grader and wanted to do a science fair project on solar cells. So we devised an experiment to see if reflecting light with a mirrow would increase power output. We constructed a circuit using an amp-meter, solar cell, and 10Kohm resistor. He hypothesized that reflecting sun...

Hello community, in project group I am doing some in which I definitely need your help. Basically what I am intending to do is to examine the cell proliferation of cell of the colorectal carcinoma. The data I will receive is from the xCELLigence system and generates so called cell...

I was wondering why photoelectric cells are evacuated

How do you know which plasmids are suitable (disregard the efficiency for now) for say, mammalian cells? For example, this http://www.addgene.org/12091/" is it suitable for HeLa cells? Basically, I'm confused as to what "Growth strain" and "Vector type" mean. Does Growth strain mean where the...

Calculate the ξ° value for the galvanic cell: IO3(aq) + Fe2+(aq) <--> Fe3+(aq) + I2(aq) So I found the half reactions to be: 5Fe2+(aq) --> 5Fe3+(aq) + 5e- Reducing agent 0.77V 6H+(aq) + 5Fe2+(aq) + 5e- --> I2(aq) + 3H2O Oxidizing agent The problem I have is that I can't find the...

Hey everyone, I was just wondering, in a PEM fuel cell the Hydrogen ion diffusion through the membrane is an important step. But don't these ions need to diffuse through the anode as well to reach the membrane? Also, if this is the case and the anode is a metal like Pt, wouldn't the diffusion...

Out of these I mean 1. Capsule 2. Cell wall 3. Flagella 4. Nucleus 5. Plasmid Bacteria don't have a definite nucleus, I'm thinking it is cell wall that is a permanent feature. Am I right!

This is a very cool development. I'd be excited to see what other applications this could have. http://www.bbc.co.uk/news/technology-15305579

Homework Statement Suppose you wish to determine Ka for a monoprotic weak acid of molecular mass 76.11 g/mol. The pH meter you need to use is not working. You decide to weigh out 2.28 g of the acid and 1.96 of its sodium salt and dissolve them together in water, add quinhydrone and set up a...

I want to maximize solar cell efficiency regardless of the sun's angle and so I've been looking at placing Compound Parabolic Concentrator (CPC) over the top of a high efficiency round solar cell. If I come up with a good design then I would like to try and manufacture some of them to see if I...

Knowing the atomic weights of Na+ and Cl- are 23 and 35.5, respectively, calculate the density (g/cm^3) of NaCl crystal. Hint: Avogadro’s number N = 6.02 x 10^23 is the number of atoms in one mole (weight of 1 mole = atomic weight in grams) unit cell is Face centered unit cell contains a...

Does anyone have a solutions manual for the biophysics textbook, Physical Biology of the Cell. Or a link/login info for an online copy?