Question

What types of specimens were you able to view under each of the electron microscopes in the microscope activity?

Answer 1

Good question

Answer 2

Well this one really depends on what you did in your activity, can you tell me a bit about it and maybe we can help you find the answer?

Answer 3

you got to use an electron microscope?

Answer 4

I'm jealous

Answer 5

That's the thing there wasn't really much of a lesson.. it just had very difficult questions added. I have done like hours of research on a two page activity. I hope you guys can help, I have done so much work in the past 2 days I am exhausted / :

Answer 6

I didn't really get to use one, this whole lesson was just like a if you know type thing I guess. Because I havn't used any microscopes.

Answer 7

That sucks.

Answer 8

Again though, we can't really help you if you don't tell us what you were supposed to be trying to look at.

Answer 9

Okay. Thank you.

Answer 10

Yeah electron microscopes are very expensive.

Answer 11

I know / :

Answer 12

Yes, what Kainui says is true, its impossible for us to know what you were meant to be looking at. In saying that though, keep in mind electron microscopes are used to view very small objects. Spider claws for example..

Answer 13

A dissecting microscope is one type of light microscope. It is used for examining organisms at relatively low power, magnifying the image up to 40 times the size of the specimen. A beam of light is produced above the stage and reflects off of the specimen’s surface, passing through the glass lenses that magnify the image.

The dissecting microscope is useful for examining organs and tissue during a dissection. You can also use it to view the surfaces and details of leaves, stems, mold, spores, or other small objects that can be seen with the naked eye but require magnification in order to be examined closely.

Answer 14

Compound light microscopes are the most commonly used light microscope. They can be found in most science classrooms and biology laboratories. The light source is below the stage, and the light shines up through the thin specimen and then through the magnification lenses. You can prepare the specimen for viewing by placing it on a rectangular glass slide. It can be stained with a dye that adds contrast to nearly transparent cells. Compound light microscopes usually have more than one magnification power, ranging from 40 times up to 400 or even 1,000 times the true size of the specimen.

Compound light microscopes can be used to view tissue samples, blood, microorganisms in pond water, microscopic cells, and some of the larger details within the cells.

Answer 15

Also, electron microscopes can only visualize dead samples, as preparing samples requires a lot of preparation and staining

Answer 16

Two important factors in microscopy are magnification and resolution. Magnification is how much larger an object appears compared to its real size. Resolving power is a measure of the clarity of the object. We can design light microscopes to magnify to very high powers, but the properties of light limit the resolving power.

There is decreased clarity with increased magnification. This is why light microscopes usually do not magnify beyond 1,500 times the true size of the specimen. They cannot resolve detail finer than about 0.2 micrometers, which is the size of a small bacterium cell. Because light microscopes are limited in resolve and magnification, biologists were not able to study the small details and complex structures inside cells until the development of electron microscopes.

Answer 17

You should just post your paper if you wish someone to edit your work

Answer 18

No this is the only information my lesson provides...

Answer 19

to me it makes no since / :

Answer 20

Ah, so you had some sort of homework where they provided this information and this question? (as in, there was no laboratory excercise or something similar?)

Answer 21

Electron microscopes use beams of electrons, instead of light, to view specimens. The shorter wavelengths of electrons give these microscopes a much higher resolving power, up to 0.2 nanometers. This is 1,000 times greater than the best resolving power of a light microscope. A disadvantage of electron microscopes is that they cannot be used to view living specimens because the methods used to prepare them for viewing kills cells.

These microscopes use electromagnets instead of glass lenses to magnify the image of the specimen because electrons cannot pass through glass. The electromagnets magnify the image by bending the electron beams and then projecting it onto a screen or photographic film for viewing. Transmission electron microscopes and scanning electron microscopes are two types of electron microscopes.


Transmission electron microscopes (TEM) pass a beam of electrons through a thin specimen similar to how a compound light microscope transmits light. Scientists can apply stain to the specimen to increase contrast in the image.
Insert image of a TEM, possibly the one created for the lab.

Transmission electron microscopes are mainly used for studying the internal structures of cells that cannot be viewed under light microscopes.Scanning electron microscopes (SEM) are useful for studying the details of a specimen’s surface. The electron beam scans the specimen’s surface, which is coated with a thin layer of gold metal. The electrons that scatter off of the gold-coated surface are focused onto a screen, forming a detailed image of the specimen surface. The image is three-dimensional and black and white.


Notice that the magnified images of the specimen are produced in black and white. Scientists can use computers to add artificial color to enhance visibility when needed.

Answer 22

yes. if anyone would love to take the time to read that like I did and provide an answer my teachers will accept I will give you a medal. I need help. I am in a trance. /:

Answer 23

did you provide sources?

Answer 24

I know quite a bit about microscopes to be honest but it is all just knowledge from acquiring a diploma in college as a laboratory technologist

Answer 25

and I'm far too lazy to find sources but I can perhaps edit your paper for you and provide some extra info you might want to cram into your paper if you are willing to look for sources to back up what I include

Answer 26

it's not a paper. it's just like it's a question and you type in what you know type thing.. not a paper though /:

Answer 27

oh alright

Answer 28

This seems a bit more like a comprehension excercise.. I would say something like "The type of specimens you would view under an electron microscope would the those that required a scale up to 0.2 nanometers but are too small for a dissection light microscope, like bacteria".

Please don't straight out use my answer though, see what else you can pull from the text

Answer 29

Thank you for your help : )

Answer 30

You might want to talk about how to acquire 1000x magnification in light microscopy you need to use immersion oil. Also, you can mention phase contrast which is a way to view unstained cells that are difficult to observe regularly.

Answer 31

No worries, there is nothing more annoying than being a student and not given enough information!

Answer 32

Yeah. Trust me I KNOW. my school decided to go GREEN this year and I have NO TEXT BOOKS / :

Answer 33

Wow, times are changing :S

Answer 34

You missed fluorescent microscopy which is also fairly interesting

Answer 35

That's annoying! You might want to utilise some online text books that are roaming the internet, like this one: http://ridge.icu.ac.jp/biobk/biobooktoc.html

and these are especially good: http://highered.mcgraw-hill.com/sites/dl/free/0072437316/120060/ravenanimation.html

Answer 36

Although, I do not really know what your question is asking for so maybe what you have explained is enough. Everything seems fine but I think you should read over your work a couple of times to iron out the mistakes present in it

Answer 37

okay thanks... I will just look for the right answer. It was dumb for me to ask because I am the one doing this in school not you guys.

Answer 38

No post what you like we are here to help

Answer 39

Well not really, it was just hard to understand because it sounded like you had come from a lab excercise. Asking questions with school that you are having trouble with is what this site is for :D

Answer 40

I am about to break down. I HATE this school. I feel so stupid / :

Answer 41

Hey! Its not stupid :) The question was rather misleading, anyone would have struggled with it.

Answer 42

Relax you are fine school is meant to make you feel stupid :)

Answer 43

the more you learn the less you know

Answer 44

well the less you realize you know

Answer 45

The frustration will pass, all you can do is your best

Answer 46

thanks.

Answer 47

No problem, try to stay positive :)

Answer 48

thank you so much.

Answer 49

Just for clarification when I stated,

"Everything seems fine but I think you should read over your work a couple of times to iron out the mistakes present in it"

I mean grammatical mistakes what you have present seems accurate but to be fully truthful I only just skimmed what you wrote.

Answer 50

I didn't WRITE anything that text from the uhm artical..

Answer 51

( Australopithecus - the block text is from her question, not her answer :P)

Answer 52

oh oh didn't know lol

Answer 53

I need to break my habit of skimming everything I read

Answer 54

lol