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8 views

How to model species interactions on population size dynamic?

Here are two classical discrete time models of population size dynamic. The exponential growth model $$N_{t+1} = r\cdot N_t$$ and the logistic growth model $$N_{t+1} = r\cdot N_t \left(1 - \frac{...
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1answer
8 views

Mithradates - Developing immunity to poison?

According to legend, Mithridates studiously researched and examined all known toxins and experimented with potential remedies by using prisoners as his guinea pigs. Supposedly, Mithridates’ toils paid ...
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0answers
4 views

Calculate Q10 using the best line of fit

The question: The equation of the line of best fit is y = 3.5097x+16.529 I do not understand how to find the Q10 by solving the best line of fit. The observed data:
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1answer
11 views

Are there animal species where some females have greater amounts of “masculine” qualities than average males?

In the human species, some women ( a meaningful, though not large percentage) are taller and stronger than the average man. Is a similar thing true in the animal kingdom? Are there some meaningful ...
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0answers
6 views

Why do eels go through dams?

I was interested in eels after learning about dams. I learned that there are such things as eel ladders as there are salmon ladders for the animals to swim up the damns to continue their journey, but ...
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0answers
9 views

What are the major virulence properties of Herpes simplex virus?

Having a project about Herpes Simplex Virus and I am trying to figure out its major virulence properties. I guess one of the most important ones is the fact that they establish latency and maybe there ...
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0answers
18 views

Biological & Evolutionary Reasons for Palm (Bi)Symmetry

The fingers of the human palm exhibit a (bi)symmetrical pattern with regards to their size, in the sense that the thumb and the pinky are almost the same size, and the same holds for the index and ...
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0answers
9 views

Analytical expression for negatively modulated protein expression levels

In a paper by Bashor et al., protein expression is modulated using a negative signal feedback (http://limlab.ucsf.edu/papers/pdfs/cjb_2008.pdf). I'm trying to find an analytical expression for this ...
-1
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0answers
12 views

How does EPO get into the human body and how does it affect the body

How does EPO get into the human body and how does it affect the body? I would like to get a detailed explanation of how EPO gets into our system and starts to boost the production of red blood cells. ...
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0answers
9 views
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0answers
5 views

Gaba and Magnesium

I read read that magnesium divalent ion binds to gaba receptors and induces the same effects as if gaba has binded. Does anyone know what happens to the gaba that would have been synthesised and ...
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2answers
25 views

DNA described somewhere?

This is not purely biological question but how do the companies making DNA analysis know what your DNA means? Is there some database describing human DNA? I watched some documents about DNA, gene ...
0
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1answer
21 views

How many water molecules will be produced starting from acetyl-CoA in citric acid cycle

I am puzzeled by the answer. Acetyl-CoA when enter citric acid cycle, it produces 3NADH, 1FADH2, total 4 reducing equivalents. If each one makes 1H2O, then 1acetyl-CoA should make 4H2O. Why some ...
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0answers
22 views

Which birds are capable of flying both forward and backwards?

Very random question - but it's often said that the hummingbird is the only bird that can fly backwards (for example, https://www.worldatlas.com/articles/which-is-the-only-bird-that-can-fly-backward....
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0answers
24 views

Environmental Carrying capacity concept

In many textbooks the carrying capacity is defined mathematically as the intrinsic growth rate divided by the intraspecific coefficient $K_{i}=\frac{r_{i}}{\sigma_{ii}}$ how can this be explained ...
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0answers
5 views

Minimal temperature for survival of Phytoseiulus persimilis / Amblyseius californicus

I'm looking for a recent reference about the minimal temperature at which predatory mites of the type Phytoseiulus persimilis or Amblyseius californicus can survive. The only reference I found is a ...
2
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2answers
25 views

Can a bacterium express a virulence gene and not produce toxins and what may be the cause of this?

I am preparing a seminar on viable but non-culturable (VBNC) state in bacteria, mainly foodborne pathogens and I just saw this line in a journal that "the expression of the virulence gene in VBNC ...
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1answer
43 views

From DNA data, is it easier to conclude that chimpanzees are our close relative, than it is to do a paternity testing?

Well, today I was contemplating on how to explain evolution, approaching with the dialectic method. When it came to why chimpanzees and us being so close in the tree of evolution isn't outright absurd,...
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0answers
23 views

Do primates have illnesses of similar severity and frequency to humans?

This question is about primates in the wild (apes, monkeys, simians). I want to know if they experience illnesses similar to humans, like the common cold, flu, chicken pox or other poxes, polio, other ...
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0answers
24 views

Can IPSPs produce an action potential?

This picture was taken from Purves' Neuroscience, chapter 5: Image (C) shows a inhibitory postsynaptic potential whose reversal potential "goes" to the action potential. If two or more IPSPs occur, ...
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0answers
6 views

Recommendation for ChIP-seq antibody (CEBPa) in mouse

I am looking for a recommendation for a ChIP-seq antibody towards CEBPa in mice. Currently using the D-5 from Santa Cruz (sc-365318) but yields after pulldown are more than modest. Published data were ...
0
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1answer
28 views

Unusual colony form

Has anyone so far come across a bacterium that grows in a line? And if you did, do you by any chance know what type of bacterium it is? I just discovered a few of these colonies and wondered what ...
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0answers
28 views

Are chordae tendinae capable of healing?

I haven't found anything on this question. Generally the sources say the heart cannot heal but that's contradictory. Has there been any cases of chordae tendinae rupture healing?
5
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1answer
37 views

Why are HeLa tumors purple?

I remember hearing that the tumor where HeLa cells originated from was purple and jelly like, and I've seen pictures from studies with rats and HeLa tumors, and their tumors appear to also be purple. ...
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0answers
35 views

If poison reaches it's expiry date would it be more poisonous or less poisonous?

I've found this question as a meme in social media. From common sense the right answer seems to be: less poisonous. My reasoning is: I assume the poison has an active compound. This active compound ...
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0answers
13 views

Is there a difference between dormant and latent, in regards to viruses?

When speaking of viruses, are dormancy and latency considered the same thing? According to the Wikipedia definition as well as reading into this, the answer is yes. https://en.wikipedia.org/wiki/...
1
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3answers
42 views

What tool can I use to align multiple protein sequences to one reference sequence?

I have a protein of interest which is ~300 amino acids in length. I also have around 40 short sequences (all 9 amino acids in length); these are all very different from each other. I would like to ...
1
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1answer
28 views

What is the word for being inured to loss of biological diversity?

In the title. The word has been coined relatively recently for the phenomenon of getting used to loss of diversity because of the gradual rate it happens at. For example, not finding it strange that ...
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0answers
15 views

Scorpion in Ohrid, Macedonia, 5cm long

Hi, can u please help to identify what kind of scorpion is this? A friend of mine found it at home, in urban area in Ohrid, Macedonia. It is aroun 5 cm long. Thank you.
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1answer
17 views

Is p53 a cyclin dependent kinase?

I've been reading some research papers about p53 and associated tumour suppressor proteins, such as p21. I see them referred to and associated with cyclin-dependent kinases. Is p53,p63 et cetera part ...
1
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2answers
42 views

Do new neurons divide propotionally?

Do new neurons divide propotionally? if i try to improve my reasoning skills,are the new neurons only made for that specific region of the brain that controls reasoning skill? i have heard that one ...
3
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1answer
24 views

How is plasmin formed from plasminogen?

In Ganong's Review of medical physiology it is mentioned that plasminogen is converted to active plasmin when tissue type plaminogen activator hydrolyses the bond between Arg560 and Valine 561. Can ...
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0answers
22 views

Times of reaction

can you tell me what is on average the time of a helthy human's response to a stimulus? I it varies with senses, let's focus on sight Also, how much does it change with age? I an an old man and could ...
0
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1answer
28 views

adverse effects of reduced food variety on microbiome

We often see, in science fiction, food being produced from, say, algae or yeast. Any idea what could be the effect of such a limited diet on the gut microbiome? Could there be any side-effect that ...
1
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0answers
6 views

Why was the precipitation-streamflow correlation greater in the intact catchment at Hubbard BrookI

I gave an assignment and ran a class on this data last year. https://lifediscoveryed.org/r290/hubbard_brook_streamflow_response_to_deforestation Its a classic small watershed experiment where ...
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0answers
28 views

Why can't we locate latent hiv reservoirs by using a colored dye?

I read that hiv cannot be cured because there will be latent hiv reservoirs that get activated when we stop ARV medications. But can't we locate these hiv virus particles by inserting a colored dye ...
2
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2answers
88 views

What does the presence of 6 molecules of water in this equation indicates to?

so I was studying biology today and I went over this weird question that says: The presence of 6 molecules of water in this equation: C6 H12 O6 + 6O2 --> 6CO2 + 6H20, Indicates that the: a) Complete ...
4
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0answers
35 views

How fast do we fall asleep?

When looking at the process of sleeping, most research I find point to a group of mutually inhibitory cells which form a sort of biological "flip flop." There's cells that promote awakenness and ...
1
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0answers
7 views

Myelination and time constant

In textbooks, it says that myelination doesn't really affect the time constant as tau=RC where R is the membrane resistance and C is the membrane capacitance. Myelin increases membrane resistance ...
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0answers
17 views

Can a ladybug be determined just by its number of points?

I saw a ladybug on my balcony one day and I just counted the dots. There was 18 black dots on a red/orange elytra. The location is in Europe (Geneva, Switzerland) and usually we have quite ...
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0answers
34 views

What type of worm is this ? Found it in my sink last night and I was handling raw fish [closed]

Found it in my sink last night and I was handling raw fish
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0answers
10 views

Mushroom Identification: Small conical light-brown mushroom

I found a small single mushroom growing on grass and I decided to try to identify it. Characteristics: Region: Brazil southeast coast, state of São Paulo, predominantly Atlantic forest Gilled ...
1
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0answers
23 views

Identification of an alpine blueberry type

I'm trying to figure out what kind of berry this is. It can be found all over the Swiss, French, and Italian alps, generally right where ordinary blueberries are (the ones one would eat). However, ...
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1answer
26 views

Why does glomerulus don't allow white blood cells to leave?

The glomerulus in nephrons are just a ball of capillaries, so why can't it allow the white blood cells to squeeze though the epithelial cells into Bowman's capsule just like the formation of tissue ...
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0answers
11 views

Where can I get frozen spinal cord from mouse?

Is there a company that sells frozen spinal cord (not sections) from mice? Not for use in academia. Thanks.
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0answers
22 views

Membrane proteins

Please could someone help me figure out which of the below 2 statements is correct: 1) Glycophorin A has both N and O linked glycans. 2) The ABO antigens are made up of glycoproteins. This was ...
2
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1answer
30 views

Can a brain be damaged by overstimulation?

I am wondering what, if any, long term health effects there are from high levels of brain activity. I don't mean cases where a brain is being artificially stimulated, but rather where there is a high ...
2
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1answer
137 views

Which bird is this?

Found this today in my neighborhood, my mom says it's a baby vulture and she has seen many during her childhood (in 1970's) while she lived in a small town around 200kms away from our city. However I ...
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0answers
12 views

Can digestive issues such as gas and constipation prevent stomach from fluttering? [closed]

Last week, the butterflies in my stomach due to sexual arousal had stopped and I thought they had gone for good. I had severe constipation, gas, indigestion and stomachaches then. In the morning ...
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2answers
39 views

Infectious diseases spread by insects

if blood feeding insects can transmit many diseases(west nile,...,etc.),why cannot all infectious diseases like AIDS,Ebola be vectored by insects?

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