8
votes
2answers
63 views

Leptin and fat mass?

I am interested in the relationship between blood leptin concentration and fat mass. It is well known that as fat mass increases, leptin increases. Have there been studies that look into whether the ...
0
votes
0answers
91 views

Cell Line With DNMT3a Mutation

I am looking for a cell line (preferably hematopoietic) that has an inactivating DNMT3a mutation. I have checked the Cancer Cell Line Encyclopedia but of all the hematopoietic cell lines I know I can'...
12
votes
1answer
925 views

If dinosaurs could have feathers, would they still be reptiles?

I just finished watching a video where it was mentioned that nowadays birds are dinosaurs and non-avians dinosaurs could have feathers. I confirmed this from wikipedia: Birds are highly advanced ...
3
votes
0answers
108 views

How can I keep pond water “alive”?

I've been preparing wet slides for my kids to look at from pond water. I have a mason jar of pond water. What can I do to keep the microbes in the jar alive going forward so that we can look at it any ...
2
votes
0answers
12 views

Does level of bats activity differs from day to day?

Say we measure bats activity as number of passes through given area. Can it differ significantly depending from day to day or it stays on average roughly the same? I am wondering whether the following ...
2
votes
1answer
49 views

What comes out of this bump in this vegetable?

I live in Denmark, Europe and I have in my garden this gigantic vegetable. It has a big bump on the top and i was wondering about what comes out of it?
1
vote
0answers
33 views

Quantifying temporal-spatial data [closed]

Imagine a set of territories each subdivided into 5m grid cells. Each grid cell represents a spatial unit, and that unit can have any number of variables associated with it - e.g. habitat type/subtype,...
20
votes
1answer
1k views

What is this droplet of liquid that comes out of a mosquito?

I have been looking at pictures of different species of mosquito and several times I came across pictures where the mosquito seems to be secreting some kind of fluid. In the pictures one can clearly ...
1
vote
2answers
99 views

Characters do not make the genus, but the genus gives the characters?

In his Origin of species, in the chapter entitled 'Mutual Affinities of Organic Beings: Morphology: Embryology: Rudimentary Organs', Darwin, speaking of the nature of classification systems of living ...
1
vote
0answers
23 views

Has anyone tried to prepare chemically competent Mycobacteria?

Bacterial species like E. coli are easy to transform using a variety of methods, including both chemical transformation and electroporation. Chemical transformation is especially nice to use as it can ...
5
votes
1answer
78 views

Why oceans are carbon sinks?

Building on this question, I understand pretty clearly why forests are carbon sinks (trees grow, and there is carbon stored in soil and biomass). What about the oceans, though? Are underwater ...
1
vote
1answer
167 views

Is Araucaria fruit toxic? [closed]

I've had an Araucaria tree in my garden for more than 30 years. Today a fruit fell off the tree. It looks just like this one: I want to know if it is toxic? Can I eat it? If so, how?
5
votes
5answers
886 views

Why is human vision restricted to 400-700 nm?

Across the electromagnetic spectrum, 400-700 nm is a narrow spectrum of frequencies and focused in the region of short wavelengths. For example, radio waves cover a large range of frequencies ...
4
votes
1answer
244 views

Math behind the Genetic Relationship Matrix

The genetic relationship matrix (GRM) can estimate the genetic relationship between two individuals (j and k) over m SNPs and i representing a specific SNP. What I dont understand from their equation ...
3
votes
3answers
116 views

How to estimate a genome's size?

The genome size of human is 3.000.000.000 bp and for Arabidopsis it is 255.000.000 bp. I know these numbers because their genomes have been published. Which methods are used by scientists to estimate ...
0
votes
0answers
25 views

Is it possible that the DNA of an individual changes significantly over a period? [duplicate]

Is it possible that the DNA of an individual changes significantly over a period ?
-3
votes
1answer
130 views

Normal death experience [closed]

Consider a natural cause of death (no car accidents etc) - Is it true that death is generally preceded by suffering? In other words, are we destined to experience the most severe suffering we could ...
3
votes
1answer
54 views

Anopheles arabiensis lifespan and sporogony duration

What is the longest observed lifespan of a mosquito, especially of the species Anopheles arabiensis? How long does it take for Plasmodium parasites to develop and move into the salivary glands of ...
3
votes
0answers
158 views

How stable is linear DNA transfected in eukaryotic cells?

I would like to know, with references from the literature, what is the half life of a linear dsDNA transfected in a mammalian cells. For example, if I transfect human cells with a PCR product (500-...
4
votes
2answers
955 views

Could we slow down life? [closed]

As far as I know there is no absolute time measurement (one that would measure time in a non-environment-dependent fashion) in any life form. Only such time measurements exist, which are dependent ...
1
vote
2answers
94 views

Punnet Square for Genotype Probabilities

I'm a computational physicist by trade, and today I was working with a student that is coding a simulation that requires the interactions of different genotypes to determine which phenotype will be ...
3
votes
1answer
122 views

What does the hominin phylogenetic tree look like?

I'm no biologist, but I'm curious what the rough phylogenetic tree looks like for Hominin. Could you create a rough sketch that includes: Homo rudolfensis Homo ergaster H. georgicus H. antecessor H....
6
votes
1answer
258 views

What is the impact of sertraline on white blood cells?

This simplified video and RT.com article discusses how the mechanics of the death of a white blood cell can be useful as an "alert mechanism" to other white blood cells of an incoming infection. Also ...
3
votes
1answer
485 views

How is the subunit molecular weight different from the native molecular weight?

I noticed that the native molecular weight for an enzyme is different from its subunit molecular weight. Why are they different? Aren't the genes needed to express the enzyme the same in the native ...
6
votes
0answers
248 views

Is there a karyotype database for human cell lines?

I'm looking for the karyotype of a specific cell line. Some karyotype are well known, such as HeLa or some carcinomas, but some are very hard to find, such as LG2 (B cells). Is there a database ...
6
votes
2answers
543 views

Is this species a variant of a red flour beetle?

Found this little guy crawling around the back garden - South Coast of the UK. The closest things I could find online (with an admittedly weak knowledge of where to look up these things, aside a ...
4
votes
1answer
63 views

Modelling insecticide net efficacy loss [closed]

I am currently doing some work on modelling the effects of treated nets usage on mosquito populations. Nets do not retain their maximum efficacy forever. They lose their chemical efficacy after about ...
11
votes
0answers
146 views

Selection for less efficient egg transfer in Human Botfly life cycle

I have heard that the Human Botfly transfers its eggs through other invertebrates [1], and it strikes my curiosity that if an insect could simply land on its host directly to deposit its eggs, then ...
4
votes
2answers
301 views

Why don't mosquitoes evolve towards muting themselves?

Quite certainly, muted mosquitoes would be much more effective as far as their blood-sucking pursuits are concerned, since mosquito sound is predominantly responsible for sealing their fate (between ...
1
vote
1answer
221 views

Can all animals of the same species crossbreed?

For example, take Canis lupus, the species of dog and wolf. Within their species, can all dog and wolf types crossbreed? We can forget the logistics and assume this is all done through artificial ...
1
vote
2answers
610 views

Can you Transfer Cancer Between People via Saliva or other Bodily Fluids?

This may sound like a strange question. But could a Cancerous cell be transferred from one person to another from Oral contact e.g. Through Saliva, or other exchange of bodily fluids? I know that ...
0
votes
1answer
69 views

What is a selectively neutral genotypic change?

I am reading the paper "Neutral evolution of mutational robustness". Because I am new to neutral evolution, I have a few questions. Firstly, from my understanding, genotypic neutrality means the ...
4
votes
1answer
950 views

Cause of Crease in Drupe Fruit

What causes the crease through the pericarp of a drupe fruit (peach, nectarine, olive)? It may just be in exocarp as @Ilan pointed out, but I assumed (perhaps wrongly), that the division continued ...
1
vote
2answers
199 views

Introductory book in genetics? [duplicate]

I am working in the field of neuroscience with a background in computer science. I try to find new ways of analyzing brain imaging data (mostly MRI, EEG, MEG, fMRI) with modern machine learning ...
3
votes
1answer
2k views

What is the difference between Single Nucleotide Polymorphism (SNP), Mutation and Structural Variation(SV)?

This is a question which plagues many people and today I was wondering it myself while writing a grant. Indeed, I've seen many people use the terms interchangeably, but they are all very different ...
1
vote
1answer
4k views

Bacterial capsule vs. slime wall

I've read that the bacterial capsule protects the bacterium from phagocytes and prevents water (and nutrients, possibly?) leakage from the bacterium. A less organized and less dense version is called ...
2
votes
1answer
34 views

Do we have evidence of heritable personality traits in chimpanzees?

I have read that chimpanizees have distinct personalities. Do we have evidence of heritable personality traits in them?
1
vote
0answers
170 views

Different names in paired-end sequence files

I am aligning paired end sequence reads using bwa mem and I get an error saying that ...
5
votes
3answers
243 views

How can a ligand be an integral membrane protein?

My background is in mathematics, and not biology, so please bear with me. I am currently working on a project involving the effects of Epidermal growth factor treatment (EGF) on cell migration. I am ...
4
votes
1answer
866 views

What is the optimum length of abstinence for maximum ejaculation volume in humans?

There have been papers discussing this, and whether the abstinence period should be 1 week, 2 weeks or other [1, 2]. Some think the time to maximum ejaculation volume is even longer than this. doi: ...
11
votes
1answer
2k views

What is the mass of a pigeon tail feather?

There is question at Space.SE If I drop a feather from orbit, would it burn up or “hit” the ground? there is an attempt to answer the question, but the mass of pigeon tail feather and possibly the ...
10
votes
3answers
564 views

Why are the organs for reproduction and urinary excretion combined?

We eat food for getting energy to our body parts, and we excrete the wastes through urine, feces, and perspiration. Why has nature combined the urinary tract with the genital system (urogenital ...
0
votes
1answer
2k views

How to calculate biological half life of a drug that is dose dependent?

I would like to calculate the half-life of a biological drug. This biological drug is said to have a biological half-life of: ...
2
votes
2answers
128 views

Why a continuous supply of energy is needed to support a weight?

What motivates this question is the apparent discrepancy between the concept of Work in physics and in physiology. Work in physics is defined as the dot product of the force applied to move a certain ...
3
votes
1answer
125 views

What is the genomic position of HLA-B*1502 variation?

I've searched the position and SNP ID of HLA-B*1502 variation. However, I couldn't find that where this variant exactly located on genome or HLA-B gene.
6
votes
1answer
129 views

Are there terrestrial plants that thrive on sea water?

Given the existence of coastal deserts such as in the picture below, I was wondering whether terrestrial plants can survive on sea water alone? If yes, why then do coastal deserts exist, instead of ...
1
vote
3answers
290 views

Trypsin and cell culture

I am doing an experiment where I have treat the cells with a drug and calculate their counts. I would like to know if is bad to trypsinize the cells in consecutive days i.e. twice within 48 hours. How ...
5
votes
2answers
147 views

Why is cisplatin a very potent antineoplastic for testicular cancer, but not necessarily for other cancers?

Cisplatin (structure below) is a platinum-based chemotherapeutic agent which is very effective in the treatment of some cancers. Its introduction was responsible for improving the cure rate for ...
3
votes
1answer
41 views

How high into the air are spores of molds commonly occurring?

I understand so far that most of the air surrounding us contains mold spores so that given the right environment and a food source they start to grow. I assume this is true for air close to the earth. ...
1
vote
1answer
42 views

Mitochondrial inner membrane

I know that the cristae of the inner membrane can be tubular or vesicular but I would like to know what are the functions of each .

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