Biology
Cells need mobility, sustainability, most cell sizes and shapes reflect their functions, and this is necessary for their homeostasis.
Ways of seeing:
Phase contrast takes advantage of variations in density within cells. the density variations alter certain regions of the cytoplasm to refract and bend light.
Conventional light microscopy doesn't allow assessment of live cells.
But can be very accurate and effective, especially with high quality slides.
Fluorescent microscopy utilizes location of molecules in cells. Fluorescent stains are molecules which absorb light energy at a particular wavelength and release some of that as a different wavelength.
Electron microscopes use electron beams, similar to how conventional microscopes use light. Where conventional microscopes use glass lenses, the electron microscope will utilize condenser lenses.
TEM- transmission electron microscopy
SEM- scanning electron microscopy
for TEM the specimen is suspended in plastic, which allows for extraordinarily thin slides, photographic plates.
for SEM the specimen is coated in gold or some other metallic substance, and is viewed as a solid.
- #2.2. Cell Structure - Syllabus 2016
1.1 The microscope in cell studies1.2 Cells as the basic units of living organisms All organisms are composed of cells. Knowledge of their structure and function underpins much of biology. The fundamental differences between eukaryotic...
- Transmission Electron Microscopy
...
- Electron Microscope
An electron microscope depends on electrons rather then light to view an object. Electron microscopes make it possible to view objects as small as the diameter of an atom. The electron microscope was invented in 1931....
- I'll Karyote On Homeostasis And Organization Further
Cell organization v. homeostasis -cell homeostasis is where there is appropriate internal environment. The plasma membrane forms a cytoplasmic compartment, which maintains homeostasis by allowing cells to exchange materials with their environment. Organelles...
- Scientific Measure, Conversions
Basic Quantities Length-meter (m) Mass- gram (g) Volume-Liter (L) Time-second (s) Temperature- degrees Kelvin (K) Amount of Substance- Mole (mol) Heat Energy- joule (J) Electric Current- ampere (A) Luminous intensity- candela (cd) Energy-joules (J) calories...
Biology
Cell organization, and viewing cells
Cells need mobility, sustainability, most cell sizes and shapes reflect their functions, and this is necessary for their homeostasis.
Ways of seeing:
Phase contrast takes advantage of variations in density within cells. the density variations alter certain regions of the cytoplasm to refract and bend light.
Conventional light microscopy doesn't allow assessment of live cells.
But can be very accurate and effective, especially with high quality slides.
Fluorescent microscopy utilizes location of molecules in cells. Fluorescent stains are molecules which absorb light energy at a particular wavelength and release some of that as a different wavelength.
Electron microscopes use electron beams, similar to how conventional microscopes use light. Where conventional microscopes use glass lenses, the electron microscope will utilize condenser lenses.
TEM- transmission electron microscopy
SEM- scanning electron microscopy
for TEM the specimen is suspended in plastic, which allows for extraordinarily thin slides, photographic plates.
for SEM the specimen is coated in gold or some other metallic substance, and is viewed as a solid.
- #2.2. Cell Structure - Syllabus 2016
1.1 The microscope in cell studies1.2 Cells as the basic units of living organisms All organisms are composed of cells. Knowledge of their structure and function underpins much of biology. The fundamental differences between eukaryotic...
- Transmission Electron Microscopy
...
- Electron Microscope
An electron microscope depends on electrons rather then light to view an object. Electron microscopes make it possible to view objects as small as the diameter of an atom. The electron microscope was invented in 1931....
- I'll Karyote On Homeostasis And Organization Further
Cell organization v. homeostasis -cell homeostasis is where there is appropriate internal environment. The plasma membrane forms a cytoplasmic compartment, which maintains homeostasis by allowing cells to exchange materials with their environment. Organelles...
- Scientific Measure, Conversions
Basic Quantities Length-meter (m) Mass- gram (g) Volume-Liter (L) Time-second (s) Temperature- degrees Kelvin (K) Amount of Substance- Mole (mol) Heat Energy- joule (J) Electric Current- ampere (A) Luminous intensity- candela (cd) Energy-joules (J) calories...