7
votes
1answer
99 views

Can anyone identify this caterpillar?

Can anyone identify this caterpillar we found on a cauliflower? This was the only photo we could get of it. Location : Ceres, Fife, Scotland
3
votes
1answer
1k views

How does electrolarynx work?

I have heard that this is an effective replacement for patients who have a dysfunctional larynx, partly due to cancer. I am curious to know the inner working of this device and why such a robotic ...
1
vote
0answers
44 views

Why does some skin hold perfume longer than others

I was wondering my girlfriend and I used the same perfume for a while and we sprayed the same place. And after a day her skin still smells nice while mine smells normal. Will different types of ...
1
vote
1answer
157 views

Evolution, What would the first plants have been like?

I am curious what the first plants are thought to have been like, what they may have evolved from, and how much earlier (or later) than animals they are thought to have moved to land, if they even ...
2
votes
1answer
102 views

Book-recommendation: Ethology

I am looking for a book that covers the following topics in ethology: Behaviour Sensory filtering, reponsive-ness, sign stimuli, learning and memory, instinct, habituation, conditioning, ...
2
votes
1answer
147 views

Will an 11W UVC lamp kill bacteria?

If I shone a UVC lamp (11W) on something (say for example a plastic phone case) for an hour, would that kill off a noticeable amount of bacteria? That is, if I were to go over the case with a cotton ...
17
votes
1answer
737 views

Additive genetic variance components from LMER in R

I've set up some dummy data in R which makes 40 genetically related lines, they are all siblings within a line so are genetically related by a factor of ½ thus additive genetic variance should be ...
1
vote
4answers
1k views

Are neural connections one-way?

I'm trying to think about how two neurons communicate, typically shown in pictures as an electric pulse traveling along a long, thin connective tissue. Is this depiction somewhat accurate, and if so, ...
2
votes
0answers
128 views

Does the Jungian notion of collective unconsciousness have any legitimacy in the light of modern neurobiology and epigenetics?

Carl Jung has long ago proposed a rather controversial notion of collective unconsciousness [1, 2, 3], a form of the unconscious (that part of the mind containing memories and impulses of which ...
0
votes
2answers
103 views

If DNA is the input, what is the output? [closed]

How does cells use the DNA inside them? I am looking on DNA as a strip of tape of Turing machine, but with machines its easy. I can read the tape and calculate the behavior of that machine. With cells ...
2
votes
1answer
473 views

Why do our epiphyseal plates close up in our late teens or early twenties?

What causes our epiphyseal plates close up in our late teens or early twenties? I realize that one's genetics plays the main role in this. I assume there is a gene that controls the epiphyseal plates ...
24
votes
3answers
3k views

What limits our healing speed?

Our bodies can repair quite a number of injuries very well. However, it takes time. For larger wounds, complete recovery can last many weeks. Why is this time so long, what is the most important ...
0
votes
1answer
37 views

Help me understand how the thyroid secretes

Please have a look at this close up light microscopic image of a thyroid gland: So I'm guessing the cubic epithelial cells surrounding this big red pulp are the secreting cells...? If so, is the ...
5
votes
2answers
256 views

Why do small organisms make faster movements than big organisms?

I hesitated to ask this question because it seems so obvious and intuitive. However, I am not able to explain this tendency. Background It seems to me that small organisms make faster movements than ...
6
votes
1answer
224 views

iodine: how did they manage without it in old ages? (People who were living far from the sea)

Knowing that today iodine comes either from fish products or (artificially) enriched table salt, how did people who lived far from the sea survive before (especially during the the Middle Ages)? Edit ...
1
vote
0answers
17 views

Fe(II) and Fe(III) transport from rhizosphere across plasma membrane

Does the graminaceous plants have passive uptake of Fe(II) via a passive Fe(II)-transporter enzyme? Or it it only dicots and non-graminaceous plants that have the Fe(II)-transporter enzyme? Also, can ...
3
votes
1answer
495 views

Can the sensory neuron network and the motor neuron network be considered separate networks?

I am reading up on the nervous system using wikipedia and trying to interpret one infographic on this page: I've always thought of the human nervous system as a singular network of neurons. This ...
1
vote
1answer
76 views

All or nothing phenomena

We know that an action potential is produced by an active cell membrane when the stimulus reaches a certain threshold. When it does, an action potential fires, and when it doesn't, nothing happens. ...
5
votes
2answers
556 views

How do you visualize RNA on a gel?

I have run an in vitro transcription reaction and produced some RNA of a single species and definite size. I would like to visualize it to check if the reaction worked. Can I do this on an agarose ...
6
votes
1answer
602 views

Ebola: cleaning of protective suit

As far as I know, in developed countries protection suits used by people who treat patients with Ebola are disposed of after a shift. From a rather ambitious costume last year, I still have a hazmat ...
1
vote
0answers
66 views

Does drinking spoiled milk that has been boiled upset the GI tract?

With water, boiling will kill harmful pathogens. Does this also hold true for milk ? If it does not, what in the milk will continue to cause gatrointestinal distress ? Shouldn't boiling kill the ...
6
votes
1answer
172 views

What are the psychedelic effects of (star) anise and how many people are affected?

Backstory: My girlfriend reacts heavily to chocolate and drinks containing stellar anise, in a way that seems comparable to psychedelic drugs. After consuming it, it takes approximately five minutes ...
4
votes
1answer
179 views

What equation to compare protein isoforms in a Western Blot?

The protein isoforms I am interested in comparing appear as distinct bands on the gel I have already run. I have an Excel sheet with optical density measurements I obtained using ImageJ; it looks ...
4
votes
2answers
663 views

Why proteinase K doesn't degrade itself?

Can anyone tell me why proteinase K doesn't degrade itself? If possible please provide me the source.
4
votes
1answer
287 views

How do animals handle light refraction in different media?

For a human, when diving underwater, everything is blurry because of the water's different refractive index compared to that of air, which we are accustomed to. How do animals, like turtles, seals or ...
2
votes
2answers
97 views

Are the DNA codon mappings arbitrary?

I am a Biology novice so I apologize in advance if I state anything incorrectly.... My question is, are the DNA codon mappings arbitrary? I understand that the DNA code is made up of codons which ...
4
votes
0answers
448 views

Mutation-Selection-Drift Equilibrium

mutation-selection-drift equilibrium is one of the most important concept of population genetics. I could easily find the calculations for mutation-secltion equilibrium and for mutation-drift ...
1
vote
1answer
140 views

How does fluorouracil inhibit pyrimidine synthesis?

I was reading in my pharmacology textbook about fluorouracil, and my book mentioned that fluorouracil is an antimetabolite whose function is to inhibit pyrimidine synthesis. However, I was curious to ...
8
votes
2answers
3k views

Just how dangerous is ethidium bromide?

A common precaution for preparing EtBr-agarose gels is to add EtBr only after the gel solution has cooled somewhat, because EtBr is a dangerous mutagen. Supposedly, adding it to a hot liquid allows ...
9
votes
1answer
438 views

How do I put on a labcoat?

Let's assume I am wearing a labcoat for two reasons: Prevent the various bacteria, proteins, skin cells and substances on my clothes and my skin from contaminating my experiments. Prevent various ...
1
vote
0answers
50 views

Open Source Variant Caller comparable to GATK Haplotype Caller?

Is there a Variant Caller comparable algorithmically and in performance to GATK Haplotype Caller but Open Source Compliant (non-restrictive use)?
0
votes
1answer
197 views

What's the evolutionary reason behind decussation?

A bunch of stuff in the human nervous system decussates. Optical information inputs from the eyes cross over in the optical chiasm. Multiple sensory and motor pathways cross-over before ascending the ...
0
votes
1answer
45 views

Fruit colour related to the dissolving of pectin

What does the dissolving of pectin have to do with the colour of a fruit?
6
votes
1answer
264 views

How many RNA-binding proteins can simultaneously bind on a single mRNA?

Typically, how many RNA-binding proteins can simultaneously bind to a single mRNA? Or said differently, how many "binding sites" does an mRNA have? What order of magnitude? I am interested in RNA ...
8
votes
1answer
613 views

What's the difference between growing cells in culture and cloning them?

The wikipedia page on Hela cells refers to George Gey being able "to isolate one specific cell, multiply it, and start a cell line." Later it says, "In 1955 HeLa cells were the first human cells ...
3
votes
1answer
103 views

About sharks and how they find fish

Other than olfactory senses do sharks use some kind of sense that uses electromagnetic waves? Is this similar to an electric eel? I saw a book with the cover statement 'Sharks never get cancer'. IS ...
4
votes
2answers
160 views

Is chloroplasts per cell indicative of the photosynthetic power of a plant?

Plant-A has on average N chloroplasts per cell. Plant-B has on average M chloroplasts per cell. If N > M, is plant-A more efficient in turning carbon dioxide into oxygen? Also, is it possible to see ...
3
votes
1answer
98 views

PSI-BLAST website algorithm parameters

http://blast.ncbi.nlm.nih.gov/Blast.cgi In this website, when I want to apply the psi-blast algorithm on a sequence, under the section of algorithm parameters , what does PSI-BLAST threshold mean? ...
8
votes
4answers
389 views

How does an embryo know where to grow limbs etc

For example you have a cell or already a bunch of cells. Those cell(s) divide and after several week you have a grown organism, for example a human with limbs, several different organs etc. However, ...
2
votes
0answers
235 views

How many proteins are synthesized in human body throughout life?

My idea to calculate this is: Define up to what age will do the calculation. (for instance 60) Determine how many cells born and died up to that point in life. (by type of cell) Determine how many ...
1
vote
1answer
12k views

Whats the difference between voltage gated and ligand gated neurons? [closed]

How are they similar and how are they different?
3
votes
0answers
91 views

What makes living beings alive? [closed]

To clarify, I'm not asking about the common properties of living organisms, such as reproducing and having a metabolism, etc. What I'm curious about is, what is the difference between organic ...
6
votes
3answers
107 views

What is a good source that will help me classify protists?

I am a 15 year old that enjoys looking at the micro world. The only issue that I have is that I can't find a good online source that will help me classify the name of the micro organism that I'm ...
2
votes
3answers
212 views

To get Standard ECG from PhysioNet?

I am trying to get standard ECG by using PhysioNet's ATM with parameters but I get It should be something like How can you get complete standard 12-lead ECG out of Physionet database?
2
votes
2answers
342 views

Why does K+ have more concentration inside of the cell compared to outside of the cell? Why is Na+ and Cl- the opposite? [closed]

Can someone tell me the fundamental reason why K+ has low concentration outside of the cell and more inside of the cell?
0
votes
1answer
80 views

Can anyone remind me of the name for the inter-scapular space on the back?

It's one of those names which are often said not to exist, like philtrum.
4
votes
1answer
82 views

protein-binding sRNAs

I am actually a computational biologist, pardon me if my question description is a bit off-note, my curiosity is driving me on A bit of background and context: In bacteria, a regulatory protein ...
19
votes
1answer
186 views

What is the mechanism responsible for the periodicity of hiccups?

Hiccups (singultus) are caused by involuntary spasm of the intercostal muscles and diaphragm, producing a sudden inspiration with associated glottic closure. It seems the neurobiology of the reflex ...
6
votes
1answer
578 views

Questions about insects eating flour and living in the cracks of a wooden cutting boards

I have a large wooden cutting board which is used in my kitchen mainly for preparing egg pasta. The wood type is Populus (poplar or aspen or cottonwood). The main ingredients used with the cutting ...
1
vote
1answer
130 views

Possibility of Human cloning

Technology has evolved so much as to clone animals. But, what about human cloning? Is it really possible to create humans in lab? Or is it that technology has not advanced to that level..? Why cant ...

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