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27

First, tattoo pigment isn't injected into cells. If you were to puncture a cell with something the size of a tattoo needle, it would die - full stop. Many cells are destroyed in the process though, mostly by tearing, which initiates the wound healing process. So what actually happens is the particles lodge in between the cells of the dermis (the layer below ...


17

Welcome to Biology.SE. Am I remembering this incorrectly? Yes, you're remembering well. I think you're talking about slime molds. You'll find more information on the wiki page Is this the video you saw? These images are pretty cool. Is this even possible? Yes (given that it exists). There is no way to correctly answer this question as it really ...


11

Contrary to the other answer posted, this paper shows via microscope images that the tattoo ink is in fact absorbed into cells, and forms small intracellular round granules. Electron microscopy of untreated tattoos revealed membrane-bound pigment granules, predominantly within fibroblasts and macrophages, and occasionally in mast cells. These ...


6

Homeothermic multicellular organisms have special tissues that burn resources to warm up (usually this involves breaking the electron-transporting chain at the final stages of respiration to transform all chemical energy into thermal energy). And they have special tissues (fat) and enough body mass (this is more about the volume/area ratio) to keep this ...


3

You have several questions, please try to limit your posts to one question each. That being said, I'll try to address each of your concerns. Does the cold cause these cells to apoptose? No. The purpose of staining at 4°C and washing with cold buffer is twofold - to maintain viability (all cellular processes slow down at lower temps) and to prevent ...


2

How long human egg cell grow up until sperm fuse it? Ovules are made while the female is still in the uterus of her mother. The ovules (in the form of ovarian follicles) are kept in the ovaries for a long time, and just a month before leaving the ovary (ovulation), the ovarian follicle (and the future ovule) gain in size. In other words, the ovules are ...


2

From the abstract of the linked article (Guttman, 2002): We used an in vivo genetic screen to identify 13 effectors [...]. Although sharing little overall homology, the amino-terminal regions of these effectors had strikingly similar amino acid compositions. And from the body: The screen relied on the type III secretion signal and the endogenous ...


2

Why a bi-layer? There has been an MD simulation carried out to investigate the biophysicochemistry of spontaneous bilayer assembly. There, lipids start in random orientations. The ordered bilayers we know and love spontaneously assemble in under 100ns. It would appear that the conditions for an ordered bilayer are so favourable that they take precedence ...


2

Erythrocyte metabolism is unique in that the mature erythrocyte contains no mitochondria and therefore no Kreb's cycle! Instead the energy needs of the RBC are met largely (95%) by anaerobic glycolysis in the two pathways: Embden-Meyerhof + Hexose-monophosphate. + Virginia University source


2

The process you are asking about is called the termination of the immune response, and for a long time it was not studied very much for some reason, with scientists preferring to analyze initiation instead. However, this has changed in recent years, and while we still don't know a good deal, the picture is much clearer than it had been a decade or three ago. ...


2

Ploidy and reproductive isolation in plants Speaking generally, there is simply no question that for flowering plants there can be a sexual pathway between diploid and polyploidy levels. The question is how wide is the bridge and how much flow is there in either direction. In other words the questions become "How much flow?", "How meaningful the flow?", ...


1

Short answer: That MAY be the sound of the damaged hairs dying. You MAY not hear that frequency again but that's unlikely. Long answer: Okay, so tinnitus, or ringing in the ears, can happen because of many reasons. There are three real kinds: 1) Spontaneous tinnitus can happen because of slight shifts in the acoustic systems of the ears, some of the hairs ...


1

But when does exactly osmosis occurs instead of diffusion? These processes are not mutually exclusive. Both can happen simultaneously. Their rates depend on different parameters such as permeability of the membrane towards water and the solutes. A semi-permeable membrane has different permeability for different molecules. There are cases when one of ...



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