2
votes
1answer
54 views

Do Blanding's Turtles die of old age?

I have recently found articles and various claims that turtles (Blanding's turtles as an exact example) could possibly live indefinitely. http://discovermagazine.com/2002/jun/featturtle This is said ...
1
vote
0answers
39 views

His Tag location in gene circuit

I am part of an undergraduate research group and we are trying to produce a protease in an E.coli gene circuit. We are not sure where to place the His tag in our circuit. The sequence is ...OmpA(gene)-...
3
votes
0answers
80 views

How to understand relatedness in an infinite island model?

My understanding is that the relatedness coefficient in kin selection models measures positive assortment. That is, altruism is more likely to evolve if altruists tend to interact with other altruists....
4
votes
1answer
843 views

What happens to the red blood cell in CaCl₂ solution?

Here's the problem: One red blood cell is placed in a hypertonic solution of NaCl, another is placed in a solution of CaCl2 equimolar with the NaCl solution. What would you expect to happen and why? ...
5
votes
1answer
47 views

How are the physiological properties of mitochondria measured?

this is my first question on BiologySE. I am a Physics and Mathematics student currently doing a project on cell growth simulation. I am doing literature survey and I have a question about cellular ...
8
votes
2answers
294 views

Which part of human body sustains most pressure when standing up straight?

Let's suppose a healthy fit barefoot young adult standing comfortably on a flat solid surface. A reasonable guess is somewhere around the foot. But is it the ankle, the heel, or the Metatarsus?
1
vote
2answers
255 views

What's read depth in VCF?

There is an attribute defined as DP (Total Depth) in VCF file format. For example, http://www.1000genomes.org/node/101. What does this attribute mean? If I get a value of like DP=128. How can be that ...
-1
votes
1answer
83 views

What is enrichment? [closed]

Could someone please clarify, in layman's terms, what enrichment means? I'm currently looking at MACS and peak calling. Repeated mentions of "enriched" or "enrichment". Thanks.
3
votes
1answer
135 views

Michaelis-Menten equation type - how it is derived?

Can somebody explain how is the following differential equation found? It is about the blood alcohol content. See this article (pages 3 and 4). They say the concentration of blood alcohol ...
2
votes
0answers
91 views

Recommendations for an intro level virology textbook? [closed]

I'm a college sophomore, and I was just accepted into a research lab that works with retroviruses. Since I haven't taken any classes on the topic yet, does anyone have recommendations for good, intro-...
8
votes
1answer
152 views

Identify this caterpillar

Could anyone try to help identify this caterpillar, there are loads of them all over my garden and I've got three of them in a makeshift caterpillar house. I've had them for about a week and they've ...
7
votes
1answer
113 views

Plant identification in Turkey

What species is this ? It is a stinky, hairy plant. I have found it nearby a river. It had reached a height of 1 meter. Bloomed three weeks ago. Found in Turkey.
11
votes
1answer
380 views

What is the transmembrane 'Positive-Inside Rule' nowadays? Has the definition changed over time?

First definition. Two publications by von Heijne in 1989 and 1992 coined the 'Positive-Inside rule' and showed it's practical value in topology prediction of transmembrane helices. It was clearly ...
32
votes
5answers
4k views

Is there an advantage to antibacterial soap?

There are plenty of different hand soaps out there, as well as hand sanitizers. Is there an advantage to soaps that claim that they're antibacterial vs soaps that just say soap? In particular I'm ...
5
votes
2answers
54 views

Is there a name for this phenomenon described in “Phylogenies and the Comparative Method”?

The figures below are from Felsenstein's paper "Phylogenies and the Comparative Method". I was wondering if there was a specific name for this effect where there is an apparant correlation that is ...
3
votes
1answer
62 views

Altruism in viscous (asexual) populations

The viscosity of a population is the tendency of offspring to remain near their place of birth. Taylor 1992 ("Altruism in viscous populations") provides a model to study how viscosity affects the ...
3
votes
1answer
190 views

What biological processes can affect the temperature of the shadow a tree casts?

Assuming two trees have similar shape and leaf coverage, could differences in the biological processes among them lead to differences in the temperature of the shadow they cast? What biological ...
0
votes
1answer
50 views

What happens in lasik operation?

First of all,I am very bad at biology. So please bear if it sounds elementary. I heard about lasik operation for reshaping cornea. Assume the patient is suffering from myopia implying lens is ...
5
votes
1answer
699 views

What does it mean to “map the human genome”

I know some elementary chemistry and biology. I also think I know what a gene is (it's a sequence of DNA which encodes a particular protein). I also know that on a chromosome there are sections of DNA ...
4
votes
1answer
151 views

What are dreams, biologically?

Falling asleep or states of subconsciousness does not stop the mind from making its own fictional images. These seem like sensations just like those received from human eyes. But, how do we define ...
2
votes
1answer
188 views

Does our heart stop when we sneeze?

Is it fact or myth that our heart stops beating for moments when we sneeze? If it is fact, what drives the heart to start beating again?
2
votes
3answers
199 views

LCMS/MS versus Western Blot

I have a general question regarding which method would you recommend me to use if I would like to investigate the difference in the level of several proteins in tissue samples and compare different ...
14
votes
3answers
1k views

Is the size of the genome across species roughly the same?

Chromosome number differs across species. Is the amount of DNA comparable between organisms, just being split into smaller chunks in those species with more chromosomes? Or do species have different ...
2
votes
0answers
51 views

Best tail for swimming?

I understand that the vertical tails of fish and the horizontal flukes of cetaceans evolved due to the spinal movements of their ancestors but I was just wondering which was the most efficient for ...
4
votes
1answer
317 views

Can anyone help me identify this plant?

I have a Chamaerops humilis in my apartment and in there is these small plants growing. I live in Denmark, Europe and my palm tree has only been inside my apartment since i got it. Can anyone ...
2
votes
1answer
343 views

Any examples of an organism's life cycle where the reproductive stage occur before the 'adult' stage?

Most life cycles we knew of consist of a juvenile stage (e.g. larval for insects, sporozoite for some intracellular parasites), a reproductive stage and an adult stage. Usually the reproductive stage ...
0
votes
3answers
71 views

Patterns/Motifs Repository [closed]

I am new to this area. I am a researcher working on fast pattern searching in general scenarios (e.g., regex in string matching). I am curious about the "regular expression (regex)" (pattern/motif) ...
3
votes
1answer
72 views

Plant identification

What plant species is this? Its stalk looks like a grapevine, but the leaves & flowers not. It bloomed this week (Mid-June). I have found it in Turkey, Amasya. If you want, I can add more ...
0
votes
0answers
29 views

Undistorting peripheral vision

I am interested in a procedure which can be applied to an image (or video) which is situated in my peripheral vision, and will result in an undistorted copy being presented to my brain. I do not know ...
2
votes
1answer
650 views

Why do flies leave dirty spots on shiny/glossy surfaces?

I've seen flies leave dark spots on lacquered wood, mirrors, glass and monitors. Why do they do that? Is it some food stash or are they dumping waste in a single spot? Why pick a smooth surface?
1
vote
0answers
21 views

List of non-native terrestrial molluscs in California?

I'm looking for a list of non-native terrestrial molluscs in California. Ideally, I also need the date each taxon was introduced into California. Can anyone help?
0
votes
1answer
29 views

Why do Alu repeats form secondary structures?

I've been doing a lot of research on Alu repeats and how they mediate the gene expression. I read the following article "Useful junk: Alu RNAs in the human transcriptome". And it says that alu ...
1
vote
1answer
754 views

best book for a comprehensive introduction to biology for a computer science graduate interested in undertaking research in bioinformatics [closed]

I have a postgraduate degree in computer science, and I wish to undertake research in bioinformatics. I had chemistry but no biology in high school. I have read bioinformatics books like "biological ...
4
votes
2answers
321 views

What is the relationship between W, X, Y and P, M retinal ganglion cells?

In Guyton and Hall Textbook of Medical Physiology (12e) the retinal ganglion cells (RGCs) are classified into W, X, and Y types. However, in Gray's Anatomy (40th ed.), RGS are subdivided into midget ...
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
93 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
928 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
79 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
168 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
916 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
245 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 ?

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