0
votes
0answers
2 views

How the pattern of fertilization path is determined before the cell division to form the blastocyst? Is it individually specific?

After sperm meets ovum,the inactive nucleus starts following a particular path inside the zygote, kind of chasing a path. This path biologically known as fertilization path. But my question is how the ...
2
votes
1answer
27 views

Which wavelength to use to determine algae using a colorimeter?

I am doing a Biology project involving the measurements of the density of algae (Nannochloropsis) using absorbance colorimetry. What wavelength should I set my colorimeter to? The issue is that there ...
2
votes
1answer
31 views

What are the “minimum requirements” for a single cell?

I saw a description of the "minimum requirements" for a cell at http://creation.com/origin-of-life in the section called "What are the minimum requirements for a cell to live?" and I'm wondering if ...
5
votes
1answer
34 views

Why are abiogenesis and evolution considered unrelated?

When a discussion about evolution comes across abiogenesis - the typical reaction is that they are unrelated (see the headline at http://www.factsnotfantasy.com/abiogenesis.php). It seems to be ...
1
vote
0answers
29 views

Why my right eye see warmer colors?

As the title says, my right eye see warmer color than the left one. I've seen a few people talking about that thanks to google, but I was unable to find a proper answer. So, what cause this strange ...
4
votes
0answers
12 views

Is it possible that the vapour form of propylene glycol could lower a humans blood oxygen saturation by the manner in which N2O does?

My understanding is that by inhaling nitrous oxide leads to the body not being able to take in as much oxygen as it usually would. Is it possible that a heavier soluble gas such as the vapour form of ...
1
vote
0answers
12 views

planting conifers in a sagebrush area

I'm looking at buying some property in the picture below. You can see the conifers (mainly Jefferson Pine and Lodgepole Pine) as the dark green dots on the outside frame. The intersecting line (top to ...
1
vote
0answers
18 views

External sensory stimuli that awaken a person from sleep

An external sound or touch can awaken someone. Can a light? It would have to be very strong, but part of the reason might be that it would have to penetrate the eyelids. And can a smell or taste? ...
2
votes
0answers
19 views

How do bumblebees and hornets avoid the negative effects of inbreeding?

I just learned that all hornets and bumblebees except for the queen die at the end of the year and the queen starts a new nest in spring. But that means the next generation of queens have only ...
1
vote
1answer
42 views

What would be required to evolve an animal (non-human) brain to obtain human-level cognition?

Could any animal subject to the right conditions evolve human-level intelligence? Suppose that an artificial intelligence (AI) decided to artificially evolve a population of octopus (don't ask why, ...
3
votes
1answer
17 views

How exactly is glyceraldehyde 3-Phosphate reverted to ribulose 1,5-bisphosphate for the continuation of the calvin cycle?

Around 6 molecules of G3P is produced at the end of the Calvin Cycle (light independent reactions of photosynthesis), and 5 of which are reverted back to RuBp. The general equation that I read is 5 ...
6
votes
2answers
369 views

How sterile is sterile when working with nucleic acids to prevent contamination?

I am reading up on preparatory work on working with nucleic acids and a lot of the instructions speak on excessive procedures on cleaning environments with high %ethanol and making sure the equipment ...
7
votes
3answers
49 views

Current along an axon

When an action potential is induced on a neuron, the local transmembrane potential jumps from $E_{\mbox{rest}}$, the resting potential of the neuron, to $E_{\mbox{eq}}$, the equilibrium potential of ...
0
votes
1answer
36 views

Does “mind” has any physical reality in biology? Or is it just an assumptive concept?

Biologically, Brain controls our thinking, ideas, decisions everything along with controlling each body parts. My question is, is there anything real as "mind "? If it's controlled by brain then ...
2
votes
0answers
8 views

Is the blastocyst a coeloblastula?

A coeloblastula is that type of blastula which has a fluid filled cavity. Since the blastocyst of the mammals does too, can it be called a coeloblastula? My book however mentions the two as different, ...
3
votes
1answer
45 views

Why can action potentials not be initiated at dendrites?

Why are action potentials not initiated at dendrites, although dendrites are the first to receive input from the presynaptic cell? In fact, excitatory postsynaptic potentials (EPSPs) at the dendrites ...
1
vote
0answers
15 views

classical conditioning paradigm for hippocampal learning

I wanted to know what a suitable classical conditioning experiment would be to analyze learning and memory capabilities in rodent models with respect to hippocampal long-term potentiation. For ...
1
vote
0answers
12 views

Brain regeneration - book recommendation

Searching for an up-to-date book on regenerative brain medicine with a focus on stem cell therapy. In addition, I am interested in modeling of the micro environment and genetic engineering of neuronal ...
-8
votes
0answers
32 views

Why do we have buttocks at the back and not in the front? [on hold]

We have buttocks at the back and not in the front. Why?
2
votes
1answer
18 views

What is the protein sequence taken as input in the Path-A prediction system

Considering the Path-A based metabolic pathway prediction (http://nar.oxfordjournals.org/content/34/suppl_2/W714.short). It uses machine learning for pathway prediction. Suppose that the input was a ...
4
votes
1answer
45 views

Relationship between toxicity of drugs and negative effects on brain

Are psychoactive drugs with lower lethal doses more neurotoxic (more damaging to the brain)? For example, tetrahydrocannabinol (one of the active components of cannabis) has a much higher lethal dose ...
6
votes
2answers
43 views

Is there a name for the evolutionary loss of vestigial structures?

Consider a biological structure which no longer benefits an organism, such as the eyes of an organism whose population now lives in total darkness. I can think of three reasons why such a structure ...
7
votes
1answer
792 views

Term for trait that is advantageous to a population only as long as it is rare

I remember reading about a concept—in evolutionary biology or natural selection, I think—whereby a particular trait is advantageous to the population or species but only so long as that trait is only ...
6
votes
0answers
24 views

THYROGLOBULIN (19S) comes to a heavier position than ferritin (51S). Why?

Sedimentation values of thyroglobulin and ferritin containing iron are 19 and 51S, respectively. But, by density gradient centrifuge, it seems thyroglobulin(19S) migrates faster than ferritin(51S). ...
3
votes
0answers
27 views

How do pacemaker cells develop during the cell aggregation process of Dictyostelium discoideum?

I was reading a paper by Tang & Othmer about oscillations and waves in Dictyostelium discoideum. Under certain condition like starvation period in the life cycle of a Dictyostelium discoideum ...
-3
votes
0answers
41 views

Is it theoretically possible to be immortal? [on hold]

I have little idea about gene sequence reading and missing of a particular code in every reading. Is that main key of aging? I mean is telomere partly responsible for this? How can we stop aging?
6
votes
1answer
27 views

How is it determined in a zygote state of foetus, that which side is mouth and which side is for anus?

After the fertilization when the zygote is in the growing state to a foetus, the main canal is introduced first, from mouth to anus. But my question is when the canal is created first how does it ...
1
vote
0answers
57 views

Why do I smell chlorine when my sinuses are clogged? [on hold]

I constantly smell chlorine after blowing my nose. I know it has to do with the sodium-chlorine ion channels but I don't know exactly what role they play. Related: I know in the disease "cystic ...
2
votes
1answer
20 views

Why Sister Chromatids and Daughter cells and not brother chromatids and son cells

In biology why do we have terminologies in terms of female relatinships such as daughter cells and sister chromatids and not in terms of male relationships. When did this custom started and is there a ...
3
votes
1answer
58 views

Why does a lack of sleep degrade my balance?

For years, I've noticed that the day after a night of poor sleep (4 hours or less), my balance noticeably degrades. For instance, while walking 20 feet to the coffee maker, I might stumble into the ...
2
votes
0answers
46 views

What effects would be caused by exposure to common life forms with opposite enantiomer biology? [on hold]

Pretend a human had their body "reflected": heart on the wrong side, etc.; but also at the biochemical level: proteins, sugars, cells, DNA, everything. What would the effects be of that human's ...
1
vote
1answer
25 views

What is the trigger of pollen tube formation when the pollen is on the stigma? [on hold]

What is the mechanism of pollen tube formation when the pollen is close to the stigma ? Is it because of chemotaxis? In other words, is the growth triggered by some chemical substance that is ...
2
votes
1answer
10 views

Do I have to use sucrose to induce a lac promotor?

I'd like to optimize the expression of a Fab fragment in Escherichia coli. For induction of the lac promotor on the pAK400 vector I use IPTG and sucrose. Do I optimize the expression in case I would ...
1
vote
1answer
20 views

What is self-immunoreactivity?

I read something like "some tested variants show self-immunoreactivity". So, what exacly is self-immunoreactivity? Is it something like antibodies induced by a specific variant showing ...
3
votes
2answers
55 views

Why “broad” instead of “large” cross-immunoreactivity? [on hold]

From the articles I read, expressions like "broad cross-immunoreactivity" pops up a lot. So, I was wondering, why "broad" is used here instead of large? Is there a specific reason?
5
votes
0answers
26 views

Zoology - Help identify the kind of spider

Yesterday, I bought a banana tree (Musa Basjoo) from a local supermarket. Today, I noticed a hive of small spiders on the tree. I do not know where they came from, so I am curious to identify these ...
1
vote
1answer
29 views

Can the Hebbian theory apply to Inhibitory Neurons

If I understand the basic Hebbian theory, when a neuron fires a pulse to another neuron and this pulse causes the target neuron to fire then the delta energy sent from the initial neuron to the target ...
3
votes
0answers
38 views

Do DNA supply houses maintain a watch list for dangerous oligos (Anthrax, Smallpox, etc.)?

The recent work by DeLoache, et al. on a synthetic opiate-precursor production pathway in yeast has generated a lot of scare stories in the media about people homebrewing heroin as easily as they ...
-2
votes
0answers
65 views

Epicanthic fold (eye)

What evolutionary advantage does the epicanthic (eye) fold provide? I know that the incidence of epicanthic folds is high in Central, East, and South East Asian populations, Mongolians, Inuit, etc. ...
1
vote
0answers
37 views

Recommend any Molecular lab LIMS (Laboratory Information Management System)

We are looking to develop or customize a LIMS for our molecular lab. Do you know of a LIMS that you've used in a molecular lab before, or one that could be used. Thanks for the help (Edit) Some of ...
7
votes
1answer
93 views

What is peptide mapping?

After searching online for peptide mapping to my understanding it can be treated as the fingerprint of the protein. It is obtained at the end of several chemical processes and it helps to understand ...
-2
votes
2answers
64 views

What is the difference between electrons and energy? [on hold]

I'm studying microbiology right now and I have come across something confusing to me. I thought electrons provided energy to the cell by being incorporated into reducing powers and eventually driving ...
4
votes
2answers
2k views

What is the contribution of the cockroach to the ecological environment?

I've read a lot about cockroaches but was unable to find how they contribute to the ecological environment. Does anyone know?
2
votes
2answers
94 views

Why are bacteria immune to snake poisons?

In a test I was asked why bacteria are insensitive to snake toxins. Is it their membrane that provides a barrier to the toxins? Or do snake poisons have specific targets and thus cannot bind to ...
3
votes
1answer
28 views

Terminology regarding cross-immunoreactivity

After reading an article, I saw expressions like "cross-immunoreactivity among epitopes", "cross-immunoreactivity among variants of virus", "immunological reactions among pairs of peptides" and so on. ...
-1
votes
0answers
60 views

Specific genetic code sequence [on hold]

Wikipedia gives the following example of genetic code (this one from mRNA): AUG ACG GAG CUU CGG AGC UAG This sequence appears to be part of a much longer ...
4
votes
0answers
20 views

Recent classification for parasitoid (ecological relationships)

I'm about to present an exam about ecological interactions in biological control. Although the position of some groups is clear, in the case of parasitoids they are included sometimes as predators, ...
2
votes
1answer
21 views

What is the distance between the sciatic nerve and the colon at the closest point?

Is it possible that a full colon impinges on the sciatic nerve? Is there anything that physically separates the sciatic nerve from the colon?
3
votes
1answer
36 views

Pavlovian Conditioning And Synesthesia

I have been reading about Pavlovian brain conditioning and it seems that documented cases are mostly limited to motor reflexes (like conditioning an eyelid to close when hearing a tone) or taste ...
8
votes
2answers
821 views

Are blood vessels organs?

Are blood vessels classified as organs? Organs compose of 2 or more tissues and perform a certain function. Blood vessels have 3 different tissues and perform a function (transport blood), yet I do ...

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