Cell Definition and 899 Threads

i mean when data is sent from the network tower to the cell phone,can the data be detected by any other device?can the wave be concentrated in a particular direction(particular device) specifically...

science book :) hi ,i am high school student it's my final year and i am interested in science . i am wondering about a book that i want to buy "cell and molecular biology by gerald karp" is it usefull for me .

so I am testing out different designs on a nitrogen laser, and wanted a quick way to test whether or not one design had a more intense output than the other. without having to buy a sensor, my idea was to direct the beam onto a solar cell, then measure the output current. higher current wud mean...

how would you learn to interpret the components of something like this? Am i seeing the whole cross-sectional area of a cell? http://learn.genetics.utah.edu/content/begin/cells/membranes/images/tomography.jpg (insulin-producing pancreas cell...

Hi Guys, I am new to this forum and would like to take this chance to say hello to everyone here. Basically, my question is about the mechanical translation of cell membrane lipid peroxidation. I am wondering if lipid peroxidation has any impact on the stiffness of cell membrane. If so, is...

If the Earth's magnetic field as measured on the surface of the Earth is somewhere between .3 and .6G and cell phone doses are around 2mG, is it then absurd to be at all concerned with even heavy exposures to the kind of low grade doses that cell phones and other electrical devices produce? I...

Homework Statement The standard reduction potentials for Ni2+ and Sn2+ are as follows: Ni2+ + 2e− → Ni E° = −0.23 V Sn2+ + 2e− → Sn E° = −0.14 V Calculate the equilibrium constant at 25°C for the reaction Sn2+(aq) + Ni(s)→ Sn(s) + Ni2+(aq) Homework Equations Nernst...

Hello everyone, Ok I know it has 23 chromosomes. But they are double structured chromosomes, so can you still call them haploid. Also spermatids, can you call them haploid cells. You can't right because they haven't matured.

Homework Statement This is one half of a load cell I am analysing for an asignment. I have managed to calculate the stress in the beam using the equations below. I have approximated the centroid to be along the red line so that I can work out the distance for M, and then taken y or...

Homework Statement Calculate dhkl and vc for the (111) direction of germanium. Homework Equations dhkl=a/sqrt(h2+k2+l2) vc=unit cell volume=a1dot(a2xa3) or vc=structure form factor/density The Attempt at a Solution dhkl=a/sqrt(3) I know how to solve this, I've just...

School experiment: Shine lamp at a solar cell, and measure the voltage using a multimeter. Independent variable is the distance between the light bulb and solar cell, dependent variable is the voltage. What is the relationship between the two? And how exactly do I prove it? What I have...

HELP!((BIOLOGY)) Cell signaling...induction and constitutive signaling? Homework Statement A cell secretes a substance that instructs a neighboring cell to adopt cell fate X. What term describes this process? A. Assymetric division B. Apoptosis C. Induction D. Retraction E...

I'm not an engineer and so I appreciate everyone who contributes. 1)Is there any measurable cell phone interference from a car battery, alternator, or starter while the car engine is running if the cell phone is in the driver's seat? 2)What would this interference look like? Thank you.

Hey everybody! I am currently doing a project whereby I have to build a test rig for a certain corrosion sensor. As part of this rig, I have to incorporate a real time weighing mechanism to determine the weight loss of the specimen during corrosion, and log it in a PC. Hence, I am...

Hi I want to know about the role which plasmids play in a baterial cell.How the genes which are coded in plasmid DNA expressed themselves ? Does the transcription of plasmid DNA takes place independently of chromosomal DNA I mean to say that do the plasmids have promotor sequence for RNA...

I did a lab using an electrochemical cell to establish a relationship between cell potential and concentration. I derived two equations from lines of best fit. One is Cell potential of Ag vs. Cu Concentration: y = -0.04520x+0.5515. The other is cell potential of Zn vs. Cu concentration: y =...

One more reason to avoid/minimize consumption of soft drinks and the like: http://cancerres.aacrjournals.org/content/70/15/6368.abstract Notice that the above study examined only pancreatic cancer cells. However, the mechanism could easily apply to numerous other types of cancers...

Using a very simple set up with high school kids, Zinc Plate *on* Filter paper soaked in ZnSO4 *on* cellophane *on* Filter paper soaked in CuSO4 *on* Copper Plate *in* Petri Dish Copper and zinc plate connected to a speaker. I know the process involved and the equations...

Homework Statement It is an experiment. Finding the internal resistance of a Dry cell. It includes 2 methods, the quick method and the graphical method. Work out and record 8 pairs of V and I reading by varying the slider of the rheostat and then work out the Ɛ (e.m.f) and r (internal...

The linked abstract from a recent article in Nature suggests that eukaryotic cells evolved form prokaryotes in a one time event and that prokaryotes show no tendency to evolve toward greater complexity. This would suggest that complex terrestrial type life forms might be extremely rare in the...

Unit Cell -- Linear Density -- BCC&FCC Homework Statement Calculate the linear density for the most densely packed directions in BCC and FCC. Note the difference in linear density. Note the difference in linear density. Homework Equations LD = #of atoms/length The Attempt at a...

Hi I am currently trying to program something that will accept a vector as input for one my function. However, this is my first time programming, and I am relying completely on the internet and the Chapra textbook for help. This is what I have so far: %Re=reynolds number %p = density of...

There is something that I just can’t seem to understand about the operation of a voltaic cell. I have a question and it would be great if someone could explain to me in detail and help clear it up for me. Let’s take for example a simple zinc and copper electrode immersed in their sulfate...

Alright, so I understand how it works, except that, I don't get how zinc metal reacts with aqueous copper (II) ions if they are completely separated by two jars. How can a copper (II) ion pull the electrons from solid zinc when it can't even physically collide with zinc?

Hello all, I already have the answer to my question, but what I would like to know is why. My question is: why in the question below is the plane 111 used to find ao and not another plane? An ordered compound of NiAl has a cubic structure with one formula unit/cell. One Al atom at...

Fabrication of Single Junction GaAs Solar Cell by MBE Hi All, My project is to produce 1 single piece of GaAs solar cell (about the size of 1cm square) by MBE technique. I have gone through some read up and simulation software software called atlas by silvaco. for time being, I am testing on...

Basically as the title says, is it possible to build a DB fuel cell stack? Something that could output 100W (to power a laptop or for power outages). I actually have access to a couple of kilos of sodium borohydride and while looking at what I can do with the stuff I came across this type of...

Security Gate + Cell Phone = ? OK guys, I have a "how does this work" question. I just moved into a new apartment which has a security gate. Now, aside from a few traditional means of opening, it has a rather unusual method, which I cannot figure out how works. My phone number was entered...

"bar of gold or copper placed in acidic solution, attached via battery to item to be plated. Eyeglasses plated placed in solution, voltage applied to create electrolytic cell, which plates material." 1. Total amount of gold to deposit on glasses made of aluminum = 0.5g. How long should the...

What started as a simple project, has become an out of control line of thought and a possible distraction, but one I think is worth picking up again. Several years ago I looked into the cost of solar for my home and the rebate that the city was offering for an approved installation. The cost of...

Hello everyone, When a cell divide, do the organalles divide, or does DNA divide first, and using that DNA information new cells synthesize organalles. Thanks :smile:

What are some of the major (if not the major) difference(s) between the inside of a single specialized cell (like a muscle cell or a skin cell) and a single-celled organism. Does a single-celled organism have the capacity to make more "decisions" than a muscle cell?

When Dr. José Luis Salgado Ruiz was diagnosed with Parkinson's disease nearly six years ago, he thought his career and his future were over. Parkinson's Disease, also known as PD, is a neurodegenerative condition that affects the central nervous system. The condition causes tremors, slowed...

I have a few questions/thoughts about microwaves ovens and cell phones that I'm hoping someone here can help with. Microwaves ovens and cell phones both use around the same range of frequencies. But microwave ovens use way more power. Ovens about 500W, cell phones at most 2W. More power...

Can someone explain to me how much pressure it would take to open the stomata of a plant cell?

Howdy, I am a mechanical engineering student with limited circuitry knowledge to start... Anyhow I have a [-500,+500]lbf load cell that is essentially a wheatstone bridge strain gauge. I want to give it either 9Vdc or 12Vdc excitation voltage since I have a regulated power supply that can...

what is the difference between solar cell, solar array, solar panel? aren't all of them the same?

For a junior design project i heard about a student using MATLAB to help operate a solar cell. Basically the sensors detected the light and shifted the p.v.cell into the lights direction, if you were to move light then cell would get re-adjusted. I guess my question is that I am not sure how...

Is there a way to make the atoms in HHO gas (Browns gas) to separte into it's elements; so the Hydrogen atoms go one way and the Oxygen in another way. By doing this I'm hoping to generate electricity from the reaction by bringing them together again. What kind of fuelcell do I need?

Q.The unit cube length of LiCl (NaCl structure) is 5.14 amstrong . Assuming anion-anion contact, calculate the ionic radius for chloride ion. How to assume anion-anion contact ? Can anyone help with a 3D figure?

when the terminals of a single cell are connected by means of a conducting wire with no resistor component is there a current flow through the wire ? jus started with current electricity have a lot of doubts thanks for any help

http://www.sciencedaily.com/releases/2010/05/100520131435.htm Sounds really neat! Reference: D. G. Gibson et al "Creation of a Bacterial Cell Controlled by a Chemically Synthesized Genome" Science, May 20, 2010 (DOI: 10.1126/science.1190719) Link...

What is the average radius for a unit cell, for example, for Na? Is it the average of the ionic radii for the different coordination numbers (weighting each coordination number the same)? Or would it be the covalent radii or something else?

Hi everyone, I'd like to prepare a presentation about solar cells. I need a few articles about multijunction solar cells from popular magazines. If you can help me, please, post there links for these articles. Thank you, Anna

I understand that generating the hydrogen that powers a typical fuel cell is (prohibitively?) energy intensive at this point, but I was curious about the following: Assuming a sufficiently efficient catalyst was obtained that allowed large-scale production of pure hydrogen without...

Homework Statement What is the Importance of Cell Differentiation in the formation of tissue? Homework Equations N/A The Attempt at a Solution I know that cell differentiation is the process in which a generic cell develops into a specific type of cell, but could you please explain...

I am looking for help on a schematic for a 12 transistor CMOS SRAM cell shown below. I understand how to implement the inverter and transmission gates and how a tri state inverter works, but I am confused when it comes to inverting the input of the buffer and how to tie it all together. Thanks...

I was organizing pennies into categories based on what they were composed of; before 1982 (I believe) pennies were made out of 95% Cu, and after they were made primarily out of zinc. I thought that the ideal penny for a voltaic cell would use a Copper penny, and a Nickel. However, I found that...

Is fullerene C_{60} elementary crystal cell or the whole crystal? I do not clearly understand it fom the context? Why is considered most perfect point symmetry form?

Question: A voltaic cell is constructed with two silver-silver chloride electrodes, each of which is based on the following half-reaction: AgCl(s) + e- = Ag(s) + Cl-(aq). The two cell compartments have [Cl-]= 1.41×10−2 M and [Cl-]= 2.70 M, respectively. What is the emf of the cell for the...