3
votes
1answer
110 views

What is the fastest but not venomous snake?

Is it known which non-venomous snake can attack most quickly? I guess it is a snake that attacks its opponent by bites, and not some kind of constrictor.
5
votes
1answer
87 views

Are Lambic beers the product of quorum sensing?

Lambic beers are a Belgian specialty which is still made by open-air "inoculation" by airborne microbiota first, followed by additional yeasts, LAB bacteria and more joining in at the time of ...
6
votes
2answers
202 views

Tap vs. mineral water for drinking

I was told a human should drink a small glass (0,3 liter) of mineral water per day to get the minerals. What is the rationale behind this? What is the difference between tap water and mineral water in ...
2
votes
0answers
130 views

Transportation of bacteria

I would like to take an apparatus containing bacteria to another country (Bolivia) from the U.S.. How do I determine whether I am allowed to do this? The bacteria are: ...
1
vote
1answer
78 views

Religion and Genetics

Are there studies that investigate the heritability of believing in supernatural things (or related concepts)? Or stated differently. Are there studies that ...
2
votes
1answer
114 views

What does “thermodynamic equilibrium” mean for an enzyme-substrate complex?

From Fersht, Enzyme Structure and Mechanism p. 87: The Michaelis-Menten mechanism assumes that the enzyme-substrate complex is in thermodynamic equilibrium with free enzyme and substrate. In ...
1
vote
0answers
185 views

Is the default kmer 25 value in Trinity still ok for assembly of 150bp reads from Illumina HiSeq 2500?

I will soon be receiving Illumina HiSeq 2500 data (150bp PE stranded reads). In the past we have been using Trinity as our assembler of choice, but it uses a default kmer value of 25. I believe this ...
5
votes
3answers
252 views

Protein structures given in PDB and SNP's

There are millions of proteins given in PDB, the sequence for which we can download in FASTA format. There are also hundreds of SNP's given in NCBI dbSNP. My question is whether the proteins in PDB ...
4
votes
1answer
183 views

Identify this large exotic bird spotted in Taipei, Taiwan

A few months ago while backpacking in Taipei I found this very intriguing large bird facing off a curious puppy in a fairly busy pedestrian area. The bird did not attempt to fly. None of the ...
11
votes
2answers
171 views

Is it possible to combine live attenuated and non-live vaccines?

There are many combination vaccines available but I've noticed that there don't seem to be any with both live and non-live components, e.g. DTaP/IPV/MMR. Such combinations could be useful in some ...
2
votes
2answers
143 views

Resting and action membrane potential..?

In the resting membrane potential of neurons the inside of membrane is kept negative and outside of membrane is kept positive by the utilization of energy through Na-K Atpase pump, While during action ...
2
votes
1answer
275 views

Plant's phylogeny tree to identify which of them are closer (genetically) with another plant

I'am trying to create a phylogeny tree from some plants, as the post's title says, to help me conclude which of those plants are closer genetically with another one plant. So let's say that this is ...
1
vote
1answer
38 views

How are cyclic hormones characterized?

I have a question regarding the description of a subset of peptide hormones, called cyclic hormones. Two examples of cyclic hormones would be somatostatin and melanin-concentrating hormones. I know ...
4
votes
1answer
7k views

Applying saliva to mosquito bites

Is it true that; when you apply your own saliva to a mosquito bite it would stop itching ?
2
votes
0answers
107 views

Why the plants are not black but green? [duplicate]

if the evolution makes the species better then why the leaf and trees are not black?? black colour absorbs more ligth than simply the green color so a black plant should make photosinthesis better ...
3
votes
1answer
50 views

I2D vs STRING for protein-protein interactions

Can someone clearly explain me the differences between STRING and I2D(Interlogous interaction database) ? What does each database do best ? Which database is better for what kinds of studies etc ?
3
votes
1answer
164 views

How does the counter current mechanism concentrate urine?

The movement of ions like sodium into the interstitial space causes water to passively diffuse out the descending loop of Henle. How does this concentrate the urine? The solvent is removed at one ...
4
votes
1answer
492 views

What is in Mosquito bites?

I was wondering what is in the mosquito bites, which causes the swelling of the skin at the bite and also the itching. I know that the mosquito injects some stuff, but what is it?
2
votes
1answer
213 views

How deep does water have to be so a mosquito can lay viable eggs in it?

I read about this idea for a mosquito trap (with a rather tactless name) where the idea seems to be that because the water available for the mosquito eggs is so shallow, they will die somehow or not ...
2
votes
1answer
62 views

Activity of DNA glycosylase

I am wondering how DNA glycosylase works from the chemical point of view. Sometimes in papers I can see that they are doing activity assays with 1M NaOH and I am trying to understand why using 1M NaOH ...
7
votes
1answer
101 views

Does urine therapy really work?

I heard a lecture from a supporter of urine therapy and he says that urine is not only good disinfection, but also drinkable source of minerals. I said to myself that I can take either one or the ...
8
votes
1answer
66 views

Is the number of legs in myriapoda determined entirely by the genome?

Myriapoda (comprising, among others, millipedes and centipedes) can have hundreds of legs (Illacme plenipes having up to 750 legs). Interestingly, the number of legs (or leg pairs) appears to differ ...
5
votes
1answer
3k views

What is the definition of a stringent/relaxed plasmid?

I have found a publication which proposes some definitions, including a definition for strict and relaxed replication. The definitions are: Relaxed control of plasmid replication. Relaxed control ...
2
votes
1answer
44 views

What does “regulatory genomics” mean?

I have read about basics of molecular genetics ,although its not a thorough in-depth knowledge. I would like to know about "regulatory genomics". What is it actually?
1
vote
1answer
53 views

Alleles notation in SNPPedia criteria

I can understand the allele notation when is in the form rs8176719(T;T) or rs8176719(G) but recently i found this ones rs8176719(T;-) or rs8176719(-;T). So im confused, rs8176719(T;-) is the same as ...
3
votes
1answer
64 views

When infected with malaria, how many parasites are within a human host?

When infected with malaria, how many P. falciparum cells are within a human host? And how does this compare with the average infection parasitemia of A. gambiae? I can't seem to find a reliable source ...
3
votes
1answer
413 views

What do the Clustal Alignment Symbols Mean?

Occasionally I will run protein alignments on peptide families and I can never remember what the symbols mean to show degrees of identity. What do they mean?
3
votes
1answer
48 views

Can a postsynaptic neuron 'shut itself off?

I am an amateur interested in neuroscience and was curious whether there is a process by which a neuron or group of neurons would close their receptors and stop receiving signals from specific ...
14
votes
2answers
435 views

Have we ever observed two drosophila lineages that evolved reproductive isolation in labs?

Background The standard definition of species refers to the concept of reproductive isolation. If two lineages are found to be reproductively isolated, then we consider these two lineages to belong ...
1
vote
1answer
93 views

Assumptions of the models for haploid and diploid selection

For a bi-allelic locus, the model for haploid Natural Selection is: $$\frac{dp}{dt} = \frac{pW_A}{pW_A + (1-p)W_B}$$ , where $p$ is the frequency of the allele $A$, which relative fitness is $W_A$. ...
1
vote
1answer
31 views

Why are different lengths of nucleotides taken for structure prediction from an miRNA match area after BLAST analysis?

Generally in miRNA prediction most researchers do as Blast search with a set of miRNAs downloaded from miRBase with the parameters they require. Later on usually custom methods are utilized to get an ...
5
votes
2answers
4k views

Diffusion of Hypotonic solution into solution with glucose and starch

Cell walls are selectively permeable to ions and organic molecules. Sometimes the selectivity is passive and a reflection of the physical laws governing diffusion. We can do simple experiments that ...
3
votes
1answer
244 views

How do GPCRs transmit a signal across the plasma membrane?

How do G-coupled protein receptors (GPCR) transmit signals through the plasma membrane? Links containing information about this and pictures will be very helpful.
1
vote
0answers
38 views

Do primitive lymph nodes exist in 12th week embryo?

Someone told me that primitive lymph nodes do not exist during this week. However, others say they can. Here is a picture about inguinal lymph nodes from here. No primary lymph nodes are visible ...
2
votes
1answer
56 views

$F_{ST}$ when considering a multi-allelic locus

Sewall Wright defined the $F_{ST}$ in a metapopulation as being: $$F_{ST} = \frac{\text{Var}(p)}{\bar p (1-\bar p)}$$ , where $p$ is a vector of frequencies of a given allele and $\bar p$ and ...
3
votes
0answers
53 views

$F_{ST}$ and the genetic variance in metapopulations

From this video (21'15''), the speaker gives the following formulae in order to calculate the between and among populations genetic variance from the $F_{ST}$: $$V_{Among Pop} = 2 F_{ST}V_G$$ ...
3
votes
3answers
185 views

Does a reduction in stem cells mean possible earlier death?

The basis of this question relies on my understanding of these 2 facts: ...
4
votes
1answer
435 views

Are there any organisms that lack ATP synthase?

ATP synthase is used by cells to synthesise ATP from ADP using energy from a proton gradient. Depending on which sites I look at, this is either a universal feature of living cells, or it's "almost ...
1
vote
0answers
44 views

Plateletpheresis for hemophilia

Plateletpheresis is seperation of platelets from whole blood and putting the leukocytes and erythrocytes back into the blood. If the person donating platelets does not have hemophilia than could a ...
4
votes
1answer
865 views

Why do veins look blue?

I know that veins carry oxygen. Veins look blue because the oxygen-depleted blood in them is blue. Is this true??
3
votes
3answers
103 views

dsDNA translation

Since DNA is double stranded and each strand is complementary to the other, the codons on each strand will come out to be different after transcription(depending on the reading frame). Does this mean ...
0
votes
1answer
81 views

Question about what the liver does NOT do

Which of the following functions is NOT performed by the liver? a) Storage of vitamins and minerals b) converts glucose to glycogen c) converts toxins to harmless chemicals d) produces bile I chose ...
4
votes
1answer
129 views

What is this spider hunting in the tree in the night?

I took the following picture of this spider in northern Switzerland (alt: ~700m) with macro flash/lense. The picture was taken during the night in a cedar tree (Thuja occidentalis).
5
votes
1answer
174 views

What is this spider?

I took the following picture of this spider in northern Switzerland (alt: ~700m) with macro flash (then it is not so big: probably around 2-3 cm, including the legs) This spider made its web on the ...
5
votes
1answer
50 views

Implications of what the discovery of Naia means

Recently a discovery was made of a ~12,000 year old girl in Hoyo Negro in Mexico. This has been covered by many different news agencies. I'm confused however by many of the reports. Does it ...
1
vote
1answer
66 views

Why can't intermediate filaments be used as tracks by motor proteins?

A motor protein like kinesin-1 cannot use an IF as a track because it lacks polarity. Can someone elaborate on this answer?
1
vote
1answer
189 views

Error in textbook

This must be an error Just as proteins have a polarity defined by the amino and carboxyl termini, oligosaccharides have a polarity defined by their reducing and nonreducing ends. The ...
8
votes
1answer
255 views

Identify a bird

I have taken this picture of a bird in university zoo in Tel Aviv. It was approximately 25 cm high and seemed to be a flightless species. Can somebody help me identify it?
4
votes
2answers
649 views

Why digest proteins into peptides for Liquid Chromatography - Mass Spectrometry?

Digesting (trypsin or whatever other proteolytic enzyme) proteins generates multiple peptides so the degree of complexity of the sample, at the peptide level, increases a lot. In addition there is ...
2
votes
2answers
46 views

Do Noroviruses include many families?

Wikipedia says Caliciviridae Family. My notes say that Norovirus includes the following Noroviruses Norwalk-like viruses Caliciviruses Astroviruses and some small gastroenteroviruses which is a ...

15 30 50 per page