Domanda del libro di testo
Put the following substances in the order they are used in a Gram stain:
Counterstain
Decolorizing agent
Mordant
Primary stain
1343
views
Ch. 4 - Microscopy, Staining, and Classification
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Non è quello che usi tu?Cambia libro di testo
Capitolo 4, Problema 3
Why can electron microscopes magnify only dead organisms?
Guida verificata passo dopo passo1
Understand that electron microscopes use a beam of electrons instead of light to create an image, which requires a vacuum environment to prevent electrons from scattering.
Recognize that living organisms contain water and other volatile substances that would evaporate or be damaged in the vacuum, making it impossible to observe them alive under an electron microscope.
Know that the preparation process for electron microscopy involves fixing, dehydrating, and sometimes coating the specimen with a conductive material, all of which kill the organism.
Realize that these preparation steps are necessary to preserve fine structural details and to allow electrons to pass through or reflect off the specimen effectively.
Conclude that because of the vacuum requirement and the harsh preparation methods, electron microscopes can only magnify dead organisms.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
2mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Electron Microscopy Principles
Electron microscopes use beams of electrons instead of light to achieve much higher resolution and magnification. Because electrons have much shorter wavelengths than visible light, they can reveal fine structural details at the nanometer scale, which is essential for studying cellular ultrastructure.
Video consigliato:
03:08
Electron Microscopes
Sample Preparation and Vacuum Requirement
Electron microscopes require samples to be placed in a high vacuum to prevent electron scattering by air molecules. Living organisms cannot survive in this vacuum environment, so samples must be fixed, dehydrated, and often coated with conductive materials, which kills the cells.
Video consigliato:
03:52Oxygen Requirements for Microbial Growth
Impact of Electron Beam on Biological Samples
The high-energy electron beam used in electron microscopy can damage or destroy living cells by breaking chemical bonds and generating heat. This makes it impossible to observe live organisms directly, limiting electron microscopy to dead, preserved specimens.
Video consigliato:
04:23Transmission Electron Microscope (TEM)
Pratica correlata
Domanda del libro di testo
Immersion oil ________(increases/decreases) the numerical aperture, which ________(increases/decreases) resolution because _______(more/fewer) light rays are involved.
1539
views
Domanda del libro di testo
The type of fixation developed by Koch for bacteria is _______.
1860
views
Domanda del libro di testo
________ refers to differences in intensity between two objects.
2206
views
Domanda del libro di testo
Resolution is best described as the ____________.
a. Ability to view something that is small
b. Ability to magnify a specimen
c. Ability to distinguish between two adjacent objects
d. Difference between two waves of electromagnetic radiation
1536
views
Domanda del libro di testo
Curved glass lenses _______light.
a. Refract
b. Bend
c. Magnify
d. Both a and b
1544
views