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What snake is this? Is it venomous?

Location: Ozark Mountains in Northern Arkansas. Size: Perhaps 4-6 feet in length. Behavior: Mower uncovered a couple of these in tall grass/brush next to a log. They did not coil up. This one lay ...
mherzl's user avatar
  • 151
1 vote
0 answers
12 views

Help identify black, brown bugs in Virginia

Please help identify these black, brown bugs found in the bathroom in a home in Virginia. The bathroom has mold due to a pipe that was leaking. They are very small and maybe 1 cm in length. The ...
user510798's user avatar
0 votes
0 answers
25 views

Camera-shy black and green damselfly in Taiwan - species identification?

These photos are from April 7 and 21, 2024 in northern Taiwan, taken in dark, moist forest locations about 10 meters apart, of a damselfly species I've never seen before, here or anywhere else. I ...
uhoh's user avatar
  • 5,486
2 votes
0 answers
20 views

Butterfly wings with ragged edges - worn out, camouflage, fungus, or something else?

Here are two different butterfly individuals of different species in northern Taiwan whose wings had ragged edges. The whitish one was pretty lethargic and just wanted to stay in the grass and be left ...
uhoh's user avatar
  • 5,486
0 votes
0 answers
15 views

How to tell the difference between adult male Golden Orb spider and a juvenile female of the same size?

I believe these are Golden Orb-weavers (Nephila pilipes). PHotos of large adult females can be found in Do these large spiders in Taiwan belong to different species? They are quite common in Taiwan (...
uhoh's user avatar
  • 5,486
8 votes
1 answer
759 views

How to read a floral diagram?

The above image is a floral diagram of the family Solanaceae So I was hoping someone could explain how to read this floral diagram The Centre suggestion axial placentation to me The ameboid like ...
math and physics forever's user avatar
-2 votes
0 answers
20 views

Absence of water during ETC

Hi everyone i just wanna know what happens if water does not get produced during electron transport chain during oxidative phosphorylation.
Grrrha's user avatar
  • 1
-1 votes
0 answers
21 views

identify the beetle

I saw this beetle one morning in Russia. It was April-May. It didn't do anything noteworthy, just sat on the grid. There is this photo:
9karamba's user avatar
1 vote
0 answers
17 views

Is there a recently published Flora of Japan in English?

I am currently getting into the study of the flora of east asia. For China, Taiwan and Korea I could quickly find modern treatises, see 1-3 below. But not for Japan, to my surprise: Even after quite ...
I. Haage's user avatar
-2 votes
0 answers
19 views

What could be the components of the ddPCR mix here, and what is the meaning of VIC FAM HEX?

Can someone please explain me the procedure shown in this diagram?
Rio's user avatar
  • 1
0 votes
1 answer
28 views

DNA slippage as the cause of insertion mutations in cancer cells?

I'm a computer science student who has started working with DNA. I know the basics but not everything. While working on the ICGC data, I found a weird pattern in the insertions: In around 60% of the ...
Wassim Jaoui's user avatar
0 votes
0 answers
15 views

How to download transcripts with certain words in description in the ENSEMBL. description?

I want to download all human tumor transcripts (in FASTA and GTF format) in ENSEMBL and I have a skim on Customize your download and Fetch data programmatically, but none of them mentioned how to ...
Astro0009's user avatar
0 votes
0 answers
18 views

Why is there no Ligase in Ligation Independent Cloning?

Ligation Independent Cloning literally says no need Ligation, but it still needs ligase to anneal the fragment to vector. And the Protocol used T4 DNA Ligase for anneal process. What does this mean &...
Gordon Chao's user avatar
1 vote
0 answers
39 views

Opening probability of a voltage-dependent ion channel

Does the opening probability of a voltage-dependent ion channel depend on the unitary conductance? I think so because of the equation: but I am not sure.
John's user avatar
  • 11
-2 votes
0 answers
28 views

Setting up lab at home [closed]

I'm considering doing some plant bioengineering at home for fun. From what I have read, the most dangerous part is the usage of Agrobacterium. I saw another thread (Is it possible to genetically ...
psubodiosa's user avatar
-1 votes
0 answers
27 views

Resemblance of a child towards mother or father

Often we see that a child resembles more closely towards either the father's facial structure or the mother's facial structure. I want to know what determines this resemblance and is it possible to ...
Ganit's user avatar
  • 99
-2 votes
0 answers
20 views

How does a person withstand a rod passing through his neck without displaying pain or significant bleeding, considering vital structures?

I recently came across a fascinating video depicting an eastern mystical practice where a person had a skewer passed through their neck, entering from one side and exiting through the other. What ...
CuriousPotato's user avatar
0 votes
0 answers
9 views

How much data to expect from metabarcoding? [migrated]

I am about to conduct my first metabarcoding study. We will be using the ITS amplicon to look at fungal community composition in soil samples. I need to write a data management plan before I actually ...
Rendzina's user avatar
-1 votes
0 answers
42 views

Superiority of Gadobutrol

My question is regarding: Comparative Studies of Different Gadolinium Agents in Brain Tumors: Differences between Gadolinium Chelates and Their Possible Influence on Imaging Features The study seems ...
George Ntoulos's user avatar
-1 votes
1 answer
35 views

Is gibberlic acid present in monocots or not?

As gibberlic acid is a PGR and helps in elongation of stems like in sugarcane,so,if it is present naturally in monocots then rice should also have. And on other hand foolish seedling disease is caused ...
VIDUSHI AGGARWAL's user avatar
0 votes
0 answers
28 views

Who was the first organism to see the Milky Way? [closed]

So, we know that dung beetles are able to see the Milky Way and use it for navigation purposes (mainly "to get away from the bun fight at the poo pile"). But dung beetles appear around 115-...
Swike's user avatar
  • 715
1 vote
0 answers
29 views

tools and techniques for determining nutrient status in plants

I am interested in tools and techniques, both commercial and academic, developed for determining nutrient status and identifying limiting nutrients in growing plants. My specific interest is in ...
sanjihan's user avatar
  • 355
2 votes
0 answers
25 views

Strong activation of MAPK signaling pathway

I am reading a paper named "Mathematical models of protein kinase signal transduction". In that paper, I encountered a condition called "strongly activated pathways". In that ...
이영규's user avatar
0 votes
0 answers
11 views

Most common causes of celiac disease

What are the causes of celiac disease? Is Genetics involved or the environmental effects cause it?
MInhaj Fatima 's user avatar
0 votes
0 answers
39 views

Why does the throat close up during an allergic reaction?

I was thinking about anaphylaxis and how strange it is that exposure to an allergen, e.g. a peanut, would cause someone’s throat to close up to the point where they can’t breathe. Why does this happen,...
powerful_bob's user avatar
-2 votes
0 answers
25 views

What is a cell related word that starts with A [closed]

What is a word that is used when talking about cells that starts with the letter A
Addi's user avatar
  • 11
-1 votes
0 answers
12 views

Need help choosing a plasmid that induces increased trehalose and glycerol production in yeast

I wanted to know how I should go about choosing a plasmid that increases trehalose and glycerol production in yeast or if anyone had any ideas on suitable plasmids.
helpdaworld's user avatar
1 vote
1 answer
36 views
+50

What goes on in the muscle during static exercise?

Starfish opens mollusc's shell by applying static force for several hours. Mollusc gets tired and cannot hold shell closed. Muscles spend some energy even when static exercise is done. But it is not ...
Vashu's user avatar
  • 63
2 votes
1 answer
39 views

No. of genes and organismal complexity?

Why do humans contain trillions of cells arranged in many complex organs, and worms contain many less cells and less organs, but we and the worm have a similar number of genes? See for example Table 1 ...
li tchi.'s user avatar
-1 votes
0 answers
34 views

Insect identification in california

I’ve recently been seeing this insect on the front of house all of a sudden and don’t know what it is. Any help would be great I’m in north California,San Francisco It’s around 1/4” big Thanks in ...
Rto1024's user avatar
7 votes
2 answers
85 views

What makes viruses like the flu and covid so tolerant of mutations compared to most other viruses?

I was curious about why we benefit from yearly flu shots and apparently will also benefit from yearly covid booster shots too, whereas this doesn't seem to be the case for most other vaccines -- even ...
Mikayla Eckel Cifrese's user avatar
0 votes
0 answers
46 views

What is this insect in this image?

Is it an insect coming out of its cocoon or some other type ? It was attached on wall like a leech and was not able to detach from that because it was glued. Location :- northern India
VIDUSHI AGGARWAL's user avatar
4 votes
1 answer
39 views

Calculating basal area per acre from variable radius plots

I have a variable-radius forest inventory that contains diameter at breast height (DBH) and basal area factor (BAF) data for each tree. I'd like to calculate the basal area per acre, but since the ...
brlockwood's user avatar
1 vote
0 answers
26 views

What is the contribution of respiratory rate to oxygen absorption?

Firstly, I am aware that oxygen absorption in the alveolus is perfusion limited. Apparently, oxygen equilibrates in ~0.25 seconds or 1/3rd of the way along a pulmonary capillary. However, we are ...
TheAnonymous's user avatar
3 votes
1 answer
50 views

Central diabetes insipidus and antidiuretic hormone

Are the levels of antidiuretic hormone in the plasma somehow hard to measure or are the results unreliable (how so)? Some countries have moved away from testing for ADH (the national health care ...
George Ntoulos's user avatar
2 votes
0 answers
24 views

Are these mallards or some other kind of duck? [duplicate]

I stumbled across these ducks in a park in Western Germany. They did not look like mallards to me but this is what image searches and bird identification apps want me to believe. Can anybody confirm ...
Matthias Klupsch's user avatar
1 vote
0 answers
16 views

#Gateway Cloning How does gene of interest replace ccdB genes?

I knew that Gateway cloning used a site-specific recombination method, but I still cannot figure out how does gene of interest actually replace ccdB genes? Bacteriophage site-specific recombination ...
Gordon Chao's user avatar
-1 votes
0 answers
27 views

What is the evidence that “release of synovial fluid gases” is the cause of knuckle cracking? [duplicate]

It has been said that knuckle cracking is due to release of built-up gases in the synovial fluid of joints, and thus not harmful. What evidence supports this statement?
powerful_bob's user avatar
1 vote
0 answers
25 views

Knock-Out (KO) Mice

We have generated an induced KO mice line for a specific gene. However when i perform IF staining I can still see substantial levels of the protein for this specific gene produced, even though the ...
shaii's user avatar
  • 11
0 votes
0 answers
21 views

Why does Haidinger's brush tilt depending on rotation direction?

Based on the Wikipedia explanation of Haidinger's brush I would expect it to remain oriented to the light polarization, no matter which way I rotate my head. However that is not what I observe. When I ...
jpa's user avatar
  • 301
1 vote
1 answer
49 views

Is the Electron Transport Chain a metabolic pathway?

In my textbook, I read the following description relating to the Electron Transport Chain (ETC): The metabolic pathway through which electrons pass from one carrier to another is called the electron ...
Arun's user avatar
  • 11
2 votes
1 answer
76 views

How do I identify the carbonyl atoms in a PDB file

Can I infer it from the atom name alone? Or do I need to look at the structure of the residue it is in?
Ivan Spirandelli's user avatar
1 vote
1 answer
63 views

How to correctly assess the impact of invasive species on a community using the diversity index?

How can the impact of invasive species on a community be correctly assessed using the diversity index if the abundance of the target species, i.e. the invasive species, is not used to calculate the ...
benjamin jarcuska's user avatar
1 vote
1 answer
37 views

Why does hydroponic basil grow a thick stem?

I heard of a basil plant growing a thick uncuttable base stem when grown hydroponically. In just 6 months. It also grew very tall. One explanation is the nutrient feed is too high. Why else might this ...
GaryW's user avatar
  • 11
1 vote
0 answers
36 views

Universal mathematical statements in biology similar to Price Equation

I just read about Price Equation and I thoroughly enjoyed the concept, as well as the elegance of the mathematical formulation. I especially enjoyed the fact that (to quote Wikipedia) it is "a ...
blehblehblecksheep's user avatar
2 votes
0 answers
42 views

Do gastropelecid hatchet fish have powered flight?

These sites contradict each other: Source 1 claims that hatchet fish do not fly, but simply jump out of the water instead: 'Species that were once thought to have powered flight, the Pantodontidae ...
Harrychink's user avatar
2 votes
0 answers
105 views

Do antibodies binding to the same epitope have similar electrophoretic mobility?

Serum protein electrophoresis is a commonly used blood test in medicine. It is often used for detection of paraproteins in the gamma-globulin region. If there is a narrow band with sharp borders ...
Hinko Pih Pih's user avatar
1 vote
0 answers
22 views

Neuronal reflex circuit

I am having trouble understanding an exam question. I am given a diagram which looks like this: I am having a lot of trouble understanding this diagram since it looks unlike the diagrams usually ...
Rosarosa's user avatar
0 votes
0 answers
7 views

Nerve Impulse Process

In the process of re-polarization, when we have achieved the normal membrane potential, why does K+ voltage gate dont close at -70mv and rather at -90mv when its hyper-polarized?
Syeda Dua's user avatar
0 votes
0 answers
18 views

Generally, order and other higher taxonomic categories are identified based on the aggregates of characters. Please explain this

In a book it is written: Generally, order and other higher taxonomic categories are identified based on the aggregates of characters. What does it means? Every group is made only after observing ...
Amit Kumar's user avatar

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