Microscopy and the Discovery of the Cell Flashcards
Son of Hans Janssen
Zacharias Janssen
father of Zacharia Janssen
Hans Janssen
who discovered that the combination of two lenses in a particular arrangement was the secret of the better visualization and magnification of objects.
Hans Janssen and Zacharias Janssen
Who invented what would become the prototype for the compound miscroscope
Hans Janssen and Zacharias Janssen
when was the microscope first modified?
17th century
who modified the microscope during the 17th century
Robert Hooke
an english scientist and mechanical genius who pioneered the microscopic research
robert hooke
recognized as the English Father of microscopy
Robert Hooke
coined for the discovery of the cell in which he described it as looked like small monastery rooms.
robert hooke
who is the dutch maker of microscopes that was the first person to see live cells in 1665 using a microscope that he himself made
Antonie Van Leeuwenhoek
who was able to grind and polish purer glass rather than the poor quality, greenish glasses commonly used in his time into a lens
Antonie Van Leeuwenhoek
through his microscope, he made pioneeribg discoveries on protozoa, red blood cells, capillary systems, and life cycle of insects.
Antonie van leeuwenhoek
who’s invention paved the way fot he development of the world’s first practical microscope
Antonie Van Leeuwenhoek
what did Antonie Van Leeuwenhoek discover through his microscope?
protozoa
red blood cells
capillary systems
life cycle of insects
rotifers
bacteria
sperm cells
who made the hand-held microscope
antonie van leeuwenhoek
1st person to see a live cell
antonie van leeuwenhoek
1st person to discover cells
robert hooke
what did robert hooke use as a subject for his microscope
a cork
what did robert hooke base the term ‘cells’ on
the cells of a monastery
what was the key for more magnification
lenses with very short magnification
what improved both the resolution and magnificationbof the compound microscope
double convex and spherical lenses
who discovered tubercle and cholera bacilli
Robert Koch
what did Robert Koch discover
tubercle and cholera bacilli
a German physician and microbiologist who was among the monumental discoviers in microbiology
Robert Koch
what microscope now has a greater magnifying power and greater resolution
modern electron microscopes
what microscope uses beams of accelerated electrons as a source of illumination
electron microscope
what microscope uses electrostatic and electromagnetic lenses in forming the image by controlling the electron beam to focus it at a specific plane with a reference of specimen
electron microscope
What are the two parts of Jansenn’s microscope
objective and eyepiece
What major discovery was discovered by Robert Koch that also paved the way in improving the future microscopes?
two infectious bacteria, tubercle and cholera bacilli
This is also known as the body
Head
it carries the optical parts in the upper part of the microscope.
Head
acts as microscopes support.
Base
carriers the microscopic illuminators.
Base
the part connecting the base to the head and the eyepiece tube to the base of the microscope
Arms
It gives support to the head of the microscope and it also used when carrying the microscope.
Arms
True or False:
Some high-quality microscopes have an articulated arm with more than one joint allowing more movement of the microscopic head for better viewing.
True
True or False:
Some low-quality microscopes have an articulated arm with more than one joint allowing more movement of the microscopic head for better viewing.
False
also known as the ocular.
Eyepiece
used to look through the microscope.
Eyepiece
found at the top of the microscope
Eyepiece
what is the standard magnification of the eyepiece
10x
the standard magnification of the eyepiece is 10x an optional eyepiece having magnification from
5X – 30X
It’s the eyepiece holder.
Eyepiece tube
It carries the eyepiece just above the objective lens.
Eyepiece tube
True or False:
In some microscopes such as the binoculars, the eyepiece tube is flexible and can be rotated for maximum visualization, for variance in distance.
True
True or False:
the eyepiece of every microscope’s tube is flexible and can be rotated for maximum visualization, for variance in distance.
False
the eyepiece tube of these microscopes are none flexible
monocular microscopes
major lenses used for specimen visualization
Objective lenses
They have a magnification power of 40x-100X
Objective lenses
True or False:
There are about 1- 4 objective lenses placed on one microscope, in that some are rare facing and others face forward.
True
True or False:
Each lens has its own magnification power.
True
True or False:
All lens has the same magnification power.
False
revolving turret.
Nose piece
It holds the objective lenses.
Nose piece
It is movable hence it can revolve the objective lenses depending on the magnification power of the lens.
Nose piece
knobs used to focus the microscope
The Adjustment knobs
What are the two types of adjustment knobs
fine adjustment knobs
coarse adjustment knobs.
the section on which the specimen is placed for viewing
Stage
have stage clips hold the specimen slides in place
Stage
The most common stage is
mechanical stage
what allows the control of the slides by moving the slides on the stage instead of moving it manually.
mechanical knobs
a hole on the microscope stage
Aperture
the microscopes light source, located at the base
Microscopic illuminator
used instead of a mirror
Microscopic illuminator
used instead of a mirror
Microscopic illuminator
lenses that are used to collect and focus light from the illuminator into the specimen
Condenser
found under the stage next to the diaphragm of the microscope
Condenser
play a major role in ensuring clear sharp images are produced with a high magnification of 400X and above
Condenser
True or False:
The higher the magnification of the condenser, the more the image clarity
True
True or False:
The lower the magnification of the condenser, the more the image clarity
False
also known as the iris
Diaphragm
found under the stage of the microscope and its primary role is to control the amount of light that reaches the specimen.
Diaphragm
an adjustable apparatus, hence controlling the light intensity and the size of the beam of light that gets to the specimen
Diaphragm
True or False:
high-quality microscopes, the diaphragm comes attached with an Abbe condenser and combined they are able to control the light focus and light intensity that reaches the specimen.
True
True or False:
mid-quality microscopes, the diaphragm comes attached with an Abbe condenser and combined they are able to control the light focus and light intensity that reaches the specimen.
False
a knob that moves the condenser up or down thus controlling the focus of light on the specimen.
Condenser focus knob
a condenser specially designed on high-quality microscopes
Abbe Condenser
what makes the condenser to be movable and allows very high magnification of above 400X
Abbe Condenser
True or False:
high-quality microscopes normally have a high numerical aperture than that of objective lenses.
true
True or False:
mid-quality microscopes normally have a high numerical aperture than that of objective lenses.
false
controls how far the stages should go preventing the objective lens from getting too close to the specimen slide which may damage the specimen
The rack stop
responsible for preventing the specimen slide from coming too far up and hit the object.
The rack stop
