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26 views

Ideas for microbiology lab. Antimicrobial properties of cutting boards

I am an undergraduate student in Biology and I am trying to design a microbiology lab that will takes 3 weeks to carry out (1-2 day each week). I am going to examine the antimicrobial properties of ...
1
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1answer
24 views

Difference between KEGG Pathway and Module (from KO mapping)

At the KEGG otholog mapping query page I can map pathways and modules. I can't seem to find an extremely low level description of the difference between the two. I think I understand what a pathway is....
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23 views

Can splicing factors control an alternative splicing of a single gene?

So far my understanding of alternative splicing is as follows: Let A, B, C, ... stand for genes of a cell's genome. When a gene is transcribed to pre-mRNA, it will contain exons and introns: pre-...
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0answers
37 views

How can we say that a gene is spacio-temporally regulated?

Gene expression is depending on the space and time of the cell. How can we distinguish the function of a gene without a chance of changing its expression? And also how is it possible to find the exact ...
2
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1answer
44 views

Original Lotka–Volterra model

I am looking for the articles in which Lotka and Volterra published their original predator prey model. I couldn’t find the model presented in many textbooks in Lotka’s book Elements of Physical ...
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0answers
18 views

Parasites with indirect lifecycle [on hold]

I triy to answer this question but I find it challanging. "Why are parasites with indirect lifecycle difficult to control?" I'm hoping if I can get a any help.
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0answers
40 views

Please help me identify what worm this is? I found it in my dogs water bowl

Please help me determine the type of worm this is. I’m very frightened. Thank you.
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0answers
28 views

What is maximum growth rate possible for tree if we could genetically modified it?

If we genetically modified tree to have it grow as fast as possible and consume carbon mass as much as possible. I want to know the uppermost limit for it to grow in each year around the tropical area ...
5
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1answer
38 views

How do schistosomes find and attach to human skin?

Schistosomes are parasitic flatworms that have a snail intermediate host and a human definitive host. After developing in the snail, they (cercariae stage) escape into the water and can attach to the ...
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0answers
4 views

Mold with hydroponic cultivation [migrated]

Not sure if it's the correct Exchange but I hope so. I recently started a new hydroponic culture with an AeroGrow Aerogarden Harvest Slim. I put it in my house that doesn't have a good air ...
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1answer
25 views

Simulating phenotype using gcta64 and 1000 Genomes

I'm looking for a way to simulate phenotypes against a real SNP data source, such as the 1000 Genomes. It must be free for commercial purpose (Eg.: MIT license). Any recommendation? I'm trying to use ...
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0answers
35 views

Cell communication [on hold]

In some organism we observe that different individual cells organize and form structures. How are these individual cells attaining the information for the grouping? How does these cells communicate?
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0answers
15 views

Book recommendations on the evolution of trees

Trees have been around for hundreds of millions of years, since the first "true wood" evolved during the Devonian period ~400M years ago. This means we have fossilized wood in the form of tree ferns, ...
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0answers
11 views

Tree with details very small foliage

I found this tree with its very small foliage. what tree would it be? [enter image description here] I living from São Paulo - Brazil!! (https://i.stack.imgur.com/xHhqu.jpg)
7
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1answer
67 views

Is there any justification for the claim that blood travels 12,000 miles per day?

An oft-quoted "fact" on the internet1,2,3 (and at least once in print4) is the claim: Your body has about 5.6 liters (6 quarts) of blood. This 5.6 liters of blood circulates through the body three ...
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0answers
7 views

Minimum LED wattage for a Spirulina growth tank?

I was recommended this stack to ask this, as it seemed like a somewhat tricky question to find an answer to! Originally I had thought that it would be around 300W per square meter, as the general ...
2
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1answer
56 views

How much variation in the human genome for humans

We are currently learning about the Human Genome Project in high school biology. Wouldn't the human genome that was mapped be different from, say, mine if it was mapped? How much variation is there ...
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0answers
29 views

What factors led to the evolution of humans in Africa rather than the New World?

I learnt at the zoo that the ancestor of monkeys existed in the Africa/South America supercontinent, but then took different paths once the two continents diverged: Old World monkeys lost their ...
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0answers
16 views

Are controls needed for urine cultures?

If testing for bacteria (gram-negative) in a urine culture, are negative or positive cultures needed? I could not find anything that says controls are needed unless results seem to be contaminated. ...
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0answers
10 views

Amylase slowing down fermentation?

I was doing a fermentation experiment with different types of corn substrates and noticed that experiments with amylase actually slowed down the fermentation rate compared to a treatment without ...
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0answers
37 views

Why are there multiple eye colors?

Human eyes vary in color between people. Why are there multiple colors? Any continuous property of the body, like arm length, varies during the evolution, there are changes between it's value of a ...
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0answers
5 views

Alternative method for starch detection but Lugol Test

I was wondering whether there were some other ways to detect starch presence in leaves but exposing them to an iodine solution, (Lugol Test). This test is the only technique I managed to find about.
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0answers
18 views

Which terms am I looking for to understand the biochemistry of Pavlovian Conditioning?

There is a biochemical basis for every brain activity. Which terms am I looking for to understand the biochemistry of Pavlovian Conditioning?
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0answers
11 views

Rabies (and maybe other diseases) - why long incubation period (in some cases) does not provide immunisation [duplicate]

On one hand vaccination is in case of Rabies effective. On the other hand the incubation period can by in some cases long (up to years says Wikipedia). Why the human does not get immunized during such ...
1
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1answer
22 views

Mushroom Identification (USA)

I would like some help identifying this mushroom I found in my yard. Location: Southeast Georgia Near Pine trees after heavy rainfall Color: Light brown to Dark Red, biggest is about 4 inches in ...
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0answers
28 views

My school test (digestive system) [closed]

Next week I’m going to be taking a test related to the science of foods. One of the thing I need to learn is the digestive system. Can anyone here suggest how I can prepare for the exam and give me ...
3
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1answer
57 views

What happens to plants if they are exposed to “sunlight” 24h a day?

I just wondered if one could grow plants faster, if they were exposed to sunlight-like light all the time. In a similar question which is not the same, I could confirm that plants have different ...
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0answers
47 views

DNA of Different Species and The Fossil Record of Their Common Ancestor

Let me please be clear about something. I believe in evolution. The evidence and data are compelling and conclusive which makes it a very well-established theory. I'm seeking a certain evidence (if ...
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0answers
11 views

Would DMSO Be An Effective Solvent For Creating A Transdermal Absorption of NMN + Pterostilbene + TMG In Humans?

I've read conflicting information on this. If not DMSO, is there a better solvent to use?
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1answer
33 views

How are peptide neurotransmitters important for the nervous system?

How essential are peptide neurotransmitters for the nervous system? I know that some peptides are hormones which can also act as neurotransmitters in the body, and that they have multiple functions (...
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0answers
17 views

Resources to identify wild mushrooms and asses risk if eaten

I live in the countryside of Western Europe by the beach with a temperate climate with pine trees and eucalypti. I found two types of mushrooms in two separate spots in the woods and would really like ...
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1answer
74 views

Has human intelligence evolved as a costly male signal?

In this video at 42:06, Daniel Dennett posits that our big brains are: The human artifice or version of the peacock's tail. Peacocks have sexual dimorphism - it's males who exhibit the costly ...
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1answer
21 views

Is the plant-human relationship a form of parasitism or commensalism?

We all know that mankind gets a lot of useful products for satisfying its needs from plants. They can be in the form of timber, fruits, oils, resins whatever. The plants don't seem to be benefitted ...
2
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1answer
73 views

What is this white fluff growing in my basement?

I live in the countryside of Western Europe by the beach with a temperate climate. After a period of unusual humidity at 84%, I noted this white fluff in the basement floor: The first picture is ...
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0answers
26 views

what type of ants are these?

so i live in NYC and these fellas started popin out near my computer screen and desk. the dont seem interested in food as my sister usally leavses candy wrapers around. they however are stinky, i ...
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1answer
38 views

What are cells not affected by hormones called?

Cells that are affected by hormones are called target cells which have their own receptors that listen to signals. I'm unsure of the actual name of cells that are not affected by hormones, I tried ...
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1answer
67 views

Lab technique to distinguish between single stranded and double stranded DNA?

What lab techniques exist to differentiate between single-strand and double-stranded DNA?
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1answer
83 views

What advantage does lactose have as the main sugar in milk?

Most organisms have lactose as their main sugar in their milk. What advantage does lactose give have over sucrose (Which is a common sugar in the plants, so it makes sense for it to be present in ...
3
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1answer
45 views

What is this insect? (Location: Hong Kong; size: 8 mm long, 4 mm wide, 2 mm thick; color: black with some brown at center on the top)

What is this insect? (Location: Hong Kong; size: 8 mm long, 4 mm wide, 2 mm thick; color: black with some brown at center on the top) The insect in the picture was slightly damaged after an ...
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0answers
15 views

Ratio of volume of carbon dioxide absorbed through photosynthesis and released through respiration

I was wondering how much co2 plants release and how much they absorb. Do they have a net intake of co2?
4
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1answer
43 views

Neisseria meningitidis transformation into a pathogen

I read the wikipedia article about Neisseria meningitidis, and it says that N. meningitidis is a part of the normal nonpathogenic flora in the nasopharynx of up to 5–15% of adults In some cases ...
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0answers
18 views

Do people have local immunity?

I mean the immunity that covers only one body part or skin area after exposure to the infection but does not cover the whole organism.
5
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2answers
189 views

What controls specific gene silencing during cell differentiation?

I am intrigued by the fact that all cells of our body use the same DNA. How do the cells differentiate during the post fertilisation divisions? I read about gene silencing, which can be an answer to ...
6
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1answer
49 views

Why does music give you emotions?

Why do we feel emotions when we hear music? Click to see video How can a set of tones arranged in a specific order and timing make you feel sad or happy? I read that music can somehow trigger the ...
-1
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0answers
33 views

Which cell organelles can divide?

I know that mitochondria and chloroplasts divide regardless of the cell cycle. But do other organelles also multiply by division? Thanks in advance
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0answers
22 views

If humans have shorter telomeres than mice, why then do we have longer lifespans? [duplicate]

Since telomeres are associated with aging, and longer telomeres means more cell divisions the cell is capable of, then longer telomeres mean longer lifespans. But then mice have longer telomeres than ...
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0answers
23 views

Alternative to Lotka Volterra

Would you guys know any kind of differential equations that would dictate population growth without relying on Lotka Volterra ? Thanks ^^
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1answer
28 views

What organism is this?

This is something I found growing under my kitchen’s sink. It looks like a growing potato and it’s really hard (tried to pull it down using a hard cardboard but in vain). I think a knife may work but ...
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0answers
20 views

Nature of prions?

Prions are more like infective proteins but how can they be distinguished from other proteins? can they also infect human beings like viruses ?
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0answers
22 views

Scientifically testing when milk goes bad

How could I test if milk has gone bad scientifically? Performing a taste test on the milk yields a subjective interpretation as to whether the milk is good or not. Is there any objective metric that I ...

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