Categories
Ask Biology

Is there any reason to use an upright microscope over an inverted microscope?

I’ve never actually owned an inverted microscope, but it seems it has only advantages compared to an upright microscope: taller, heavier samples; no crashing the objective into the glass slide; easier to operate, etc. Why then do people still use regular, upright microscopes? Is there a disadvantage I’m missing?

Categories
Ask Biology

Why don’t invasive species introduced in a single event die out due to inbreeding

Today I read a BBC Report about how Pablo Escobar had once imported 4 hippos (1 male, 3 female) into his estate in Colombia for his provate zoo. After his downfall, while other species were shipped out, hippos were considered too big to move and expected to not survive. However, to the surprise of all […]

Categories
Ask Biology

Pearl formation process: how is it called? How does it work?

I have heard a pearl is a disease of oysters. Astonished by the statement, I searched a bit in deep [1] and I understood it is in real a protection mechanism of the oyster. I know this defense mechanism is not unique in nature. E.g. humans can isolate foreign bodies (this happens with not-extractable bullets), […]

Categories
Ask Biology

What environmental conditions caused humans to develop the intelligence trait?

Every other species developed flight or fins to survive their environment so what made humans develop intelligence?

Categories
Ask Biology

Which landmark paper first described the differentiation of T-cells?

T-cells are distinguished from B cells in part by their locus of differentiation/maturation (thymus). This is textbook knowledge, but I was wondering which particular person or people were responsible for making this discovery. I’d appreciate any links to their original papers/works. Thanks a lot!

Categories
Ask Biology

Why is Gyrification Advantageous?

Standard ‘Explanation’: I’ve seen countless neuroscience articles and experts explain that ‘cortical gyrification is advantageous because it increases surface area which obviously increases your intelligence’ (e.g. this wikipedia article). Question(s): But this explanation is woefully lacking, why does surface area matter at all? That implies that somehow empty space is contributing to cognition (since the […]

Categories
Ask Biology

Blood and plucked-feather sample storage

This next field season I will be collecting both blood and feather samples and I wondered how best to store the samples. The blood samples will be used for microsatellite and/or SNP analysis. The feather samples will be used for genetic sexing and/or microsatellite analysis. Feathers: can these be stored in envelopes at "room" temperature? […]

Categories
Ask Biology

Will wiping a phone down with isopropyl alcohol daily breed bacteria resistant to disinfectants?

The title says it all. If you disinfect something more regularly, aren’t you just selecting for bacteria which are most robust to that method of disinfection? I’ve heard it said about some medications that they "can’t cause antibacterial resistance". In particular I’ve read that this is claimed about topical benzoyl peroxide in the context of […]

Categories
Ask Biology

How did rat survive these high temperature here?

From here, I learnt that rats are moving across second stage nozzle. I am sure temperature too high. Then how rat can move without any problem?

Categories
Ask Biology

What factors or forces ensure faithful inheritance of the genetic code?

The basic idea of inheritance is that some trait (be it morphological, molecular, embryonic, or behavioral) can be preserved in the form of genes and transmitted faithfully from one generation to another, although mutations can at times occur to generate variations of this trait. Since all life forms on Earth are thought to have descended […]