Cells Definition and 462 Threads

A NY Times article "Exactly How Much Life is on Earth?" (research article here, behind a paywall) says that there are about 1030 cells currently on earth and the total numbers of cells that will be on earth through its future lifespan is about 1041 cells. That is: It was implied in the...

Hi ALL! I’m Mark. I’m new on this forum. Thank you very much to possibility of registration. This is my first post over here. I am student and I am writing my final work. I have a big and serious technical problem. Maybe some of you will be able to help me. I show results of my measurements in...

I just wanted to check to see if this is a known problem, or if my issue is more likely related to something different. I have an Excel spreadsheet that has a number of lines with comments and other information at the top, and then a matrix of cells below that on several rows. I had some Excel...

I heard this while driving the other day. Progress On Perovskite Solar Cells | Earth Wise with Randy Simon https://earthwiseradio.org/podcast/progress-on-perovskite-solar-cells/ I wanted to check this out. Si melts at about 2,570°F (1,410°C). I'm not sure about 3000°F (1649°C), which...

Synthetic biology is a rapidly growing field of science that aims at redesigning organisms for medical and agricultural applications, by means of biotechnology, genetic engineering, molecular biology and other methods by chemical, biological or computer engineering. As far as I understand it...

This privately held company developed a technology to extract H from methanol stored onboard marine craft, then the H can be used in a fuel cell for power. I assume the reason for a H fuel cell vs a direct methanol fuel cell (DMFC) in a marine vessel is that direct methanol cannot deliver large...

Would it be possible to change all wavelenths to one frequency that would then be sent to a solar panel adapted for it, or once split could to be sent to cells that work in that range? In other words use all the light to produse electric power

The answer from my teacher is two of these photovoltaic cells are connected in parallel. I can understand the parallel connection will produce same e.m.f but I don't understand why the total current will be greater than ##I##. I imagined one of the cell connected to a lamp. The current through...

I have the following doubts regarding B cells. Normally upon the stimulation by a T-cell, the activated B-cell differentiates into plasma and memory cells. 1) What are the structural differences among the naive B-cells, activated B-cells, Plasma B-cells, and memory B-cells? I am interested in...

Why are beta voltaic cells so inefficient? Is it because the incident electrons are incredibly fast? According to a research, the incident electrons that get absorbed by the voltaic material are so fast that most of their energy is wasted as phonon and sonic energy. If we substantially slow down...

For electrochemical energy devices such as batteries or fuel cells working reversibly, efficiency is defined as: η=ΔrG⦵/ΔrH⦵ Since cell operates reversibly Gibbs energy change of the system is equal to electrical work done by the cell, so we can instead just use standard Gibbs energy of...

There were circular solar cells 30 years ago. Why do we have square-shaped solar cells now? Why square now?

Why is the silicon purity of polycrystalline Solar Panels lower than monocrystalline Solar Panels? I have read this explanation somewhere in the internet but not sure if it is correct? Can somebody give me an explanation please?

https://www.biorxiv.org/content/10.1101/2021.01.08.425835v1.full Can prime editing fix every mutation in every type of cell in the body?. From what I read in the article the editing efficiency of prime editing using adeno-associated virus is 1.82%, so what prevent us from repeating the same...

Sorry if my question contain misconceptions, I am just trying to learn biology on my own. From what I understood, every cell contain the same DNA and different cells express/use different parts of that DNA according to whether they are blood cells, skin cells, muscles cells etc. And cells get...

For the reaction 12H+ + 2 IO(3-) + 10 Fe(2+) - > I2 + 6 H2O + 10 Fe(3+), the solution says that H2SO4(aq) is in the cathode. For the reaction 2 H2O2 - > O2 + 2 H2O, the solution says that H+(aq) is in the cathode and anode. When is H2SO4(aq) or H+(aq) more appropriate in the galvanic cell...

Open access. https://www.nature.com/articles/s41586-021-03491-6 A more approachable synopsis at: https://www.news-medical.net/news/20210412/Tapeworm-infection-drug-blocks-SARS-CoV-2-damage-in-the-lungs.aspx Cheers, Tom

Hi, I was looking at some notes and trying to understand the following statement which refers to the diagram below. "The number of cells in the radius ## D ## determined by ## N_c = D_R^2 ## where ## D_R = \sqrt{i^2 + j^2 + ij} ## where ## i## and ##j## are the number of cells along the ## u ##...

I would be interested in hearing from the experts such as @Ygggdrasil about the prospects for a new therapy for COVID-19 using iNKT cells. According to this information page from the British Society for Immunology site: My interest was piqued by a recent announcement by AgenusBio (Agenus Inc...

How exactly do Stem Cells help in Drug trials ?Or do they really

From the ideal diode model, we can derive the open-circuit voltage (Voc) as: $$ V_{oc} = \frac{nkT}{q} ln(\frac{I_L}{I_0} + 1) $$ where ##I_0## is the dark saturation current and ##I_L## is the light generated current. From the model, if the recombination rate increases, the dark saturation...

Hi PF! I'd like to make one matrix from a cell. I've checked several suggestions, the most promising here but this did not work, giving me the unhelpful error Brace indexing is not supported for variables of this type. Error in cell2mat (line 42) cellclass = class(c{1}); Error in Feven (line...

I know tight junctions between adjacent cells are very strong and the gaps are practically zero. But what types of chemical bonds are they? Are they covalent bonds or hydrogen or ionic bonds? I mean between the claudin and occludin proteins.

In any viral infection, we know that an invading virus enters the cell and damages them (cytolytic/cytopathic). This may be a starting point for inflammation down the road. Though initial inflammation may be beneficial, a longer than necessary inflammatory process proves more damaging than...

I was wondering if we really need salt bridges when doing Electrolysis. I would answer yes, because we need to neutralize the charges in both sides, or the potential difference of the Electrolytic cell will keep increasing until the generator that is connected to it is not able to supply any...

Viruses when they infect us, enter the target cells, hijack the machinery and start producing their own Copy and eject out. So what? Question is, how do they directly cause injury to our cells? Do they harm injury our cells directly? Of course we know that our own immune system which becomes...

Hello, I understand that the action potential represents a potential difference variation (depolarization) of the voltage across a cell membrane. This concept is generally presented in the context of nerve cells (neurons) as the change in potential across the axon membrane. What about the...

Are there any instances of cells other than sperm and ova which can fuse together and share genetic material?

I have a question relating to visual basic for applications for Microsft excel. I haven't really got very far with self learning, and I am tired of having to use repetitive code. I have worked out how to create functions, however I wish to call the function for a large number of cells, and at...

I've read that some scientists are trying to come up with computers that use living cells i think to perform its task. I wanted to know how it would work, can anyone help?

What chemicals do cancer cells contain that normal cells do not? I'm working on research dealing with this, can you provide any websites that include this information? Thanks.Sciences are the laws by which God set the universe.~Cada fuerza tiene una fuerza igual y opuesta. ~

Strange but true..I was really surprised when I heard that the nuclear fall out of Chernobyl and the bombing of Hiroshima didn't affect the DNA in the germline (reproductive) cells.. Studies showed that they couldn't see a major difference between the DNA of children concieved before and after...

Despite all the evidence that exists for organic evolution, there has always been one aspect of the hole idea that has always bugged me. Why are cells the only thing in the universe that don't display the properties of entropy. What I mean is everything else in the world tends to fall apart...

Does anyone know where I can find proofs of how incident light relates to the current produced and the current and voltage relationships in a basic pn junction diode?Please help!!!Gary Ansell

u knoe, in liver cirhosis (not sure the spelling) the liver hardens right? the liver cells are supposed to be destroyed and replaced with fibrous tissue reducing the capabilites of the liver. Can anyone tell me why the liver cells are not replaced by liver cells but by fibrous tissue?

If you think about it for a bit you'll release that most cells are small: in fact too small to be seen by the unaided eye. The average cell in our body is about 50 micrometers (0.05mm) in diameter. Indeed, if you were to average the diameter of all the cells on the planet, the average would...

hi!is there any possibility to construct solar cells which convert infrared light (3�m-30�m) into electricity?

Just a question I have folks, that maybe someone could help me with:If you were running a motor by solar cell, would Power (IV) be independant of the load on the motor? Or should you get an increase in power? I know current would increase and voltage would drop along with a greater load... but...

forget about how they increase your risk of skin cancer, my question is: do they impair brain function by damaging brain cells? Maybe not from one visit, but over a series of visits? Someone said that and I had never heard anything about it before."In the construction of Immortal Fame you need...

I'm stuck in a dev bio paper. The relevant extract is porovided below: Human germ cell development begins with the specification of PGCs, which is expected to happen at the onset of gastrulation (developmental week 2) in the posterior epiblast of early postimplantation embryos. During gestation...

Can somebody explain this please? I don't understand this.

The origin of advanced eukaryotic cells (that make up all higher organisms (protists, plants, fungi, animals)) have been hypothesized to involve an archaeal cell internalizing a formerly free living alphaproteobacterium. PF threads on this are here and here. Japanese researchers have isolated...

In this article, writer says that when atom is hit by photon it gets excited and expelled out of atom and this can be used to form images. My questions are: Why didn't the electrons get to a higher energy level, instead of getting knocked out? How do we find the color(frequency of wave) using...

Godzilla II was shown last month. I watched Godzilla I again. They explained that when Earth was still radioactive, these creatures evolved so their cells could use radioactivity as power source. Do you know of the schematic because I want to understand how the radioactivity can avoid destroying...

Hi, I was studying soft matter physics when a question arose between a friend and me. Namely if red blood cells can be considered to be a colloid. Colloids as it was presented to us had 3 criteria: high diffusion so the particles wouldn't form a sediment, a small reynolds number and a surface...

Hi, Could you please help me with the questions below? All of the questions are related to each other. Thank you. Question 1: Please have a look on this attachment. The following text is from the parts highlighted in yellow in attachment. "Dynamic memory cells store a data bit in a small...

do gum stem cells exist for 100% regeneration of my gums and do stem cell teeth treatment exist as well?what is a gum lift and what does it do for the human mouth? what does gum graphting do? I had asked this in a dentistry forum and its been a year or over 2 months with no response from them so...

People in this Science magazine news article argue yes. The idea that the neuron cell type was in some way derived from secretory cells has been around for a while (1970's at least). The new findings involve finding similarities in how nerve cells and particular secretory cells shared an...

Brain cells from Alzheimer's patients have been found to have modifications of the amyloid precursor protein gene which forms plaques in the brains of people with Alzheimer’s disease. The modifications were duplications, partial deletions, and changes in sequence. This can result in multiple...

Hey everyone, I have to do this presentation about solar cells and how they work. I've been doing a lot of research, and now I know a lot about how they work. However there is just one thing, that I can't understand. So in a solar cell there is an N-type and P-Type. The N-type has too many...