Examples of photomultiplier tube in the following topics:
-
- A scintillation detector is created by coupling a scintillator -- a material that exhibits luminescence when excited by ionizing radiation -- to an electronic light sensor, such as a photomultiplier tube (PMT) or a photodiode.
-
- The sequences of points of light from the specimen are detected by a photomultiplier tube through a pinhole.
-
- These are detected when they reach a scintillator in the scanning device, creating a burst of light which is detected by photomultiplier tubes or silicon avalanche photodiodes .
-
- Photomultipliers are extremely light-sensitive vacuum tubes with a photocathode coated onto part (an end or side) of the inside of the envelope.
- Photomultipliers are still commonly used wherever low levels of light must be detected.
-
- A blood collection tube is a sterile glass or plastic tube with a closure.
- Translucent-topped tubes contain a weaker vacuum in the same sized tube, and will gather less blood.
- With the vacuum tube system, the needle pierces the top of the sample tube and will potentially come into contact with the additives in the tube.
- Vacuum tubes for blood collection have colored tops which define the additives to the tube.
- The gold tube contains a clot activator and gel for serum separation, the green tube contains heparin for clinical chemistry, and the red tube contains a clot activator.
-
- Cathode rays are electron beams or streams of electrons that were observed for the first time in Crookes tubes (vacuum tubes).
- The early cold cathode vacuum tubes, called Crookes tubes, used a high electrical potential between the anode and the cathode to ionize the residual gas in the tube.
- These were called Crookes tubes.
- But at the anode (positive) end of the tube, the glass of the tube itself began to glow.
- A Crookes tube is a rarefied tube evacuated to a pressure below 10−6 atm.
-
- The Fallopian tubes, or oviducts, connect the ovaries to the uterus.
- The Fallopian tubes, also known as oviducts, uterine tubes, and salpinges (singular salpinx), are two very fine tubes lined with ciliated epithelia, leading from the ovaries of female mammals into the uterus via the uterotubal junction.
- These tubes allows passage of the egg from the ovary to the uterus.
- The different segments of the fallopian tube are (lateral to medial):
- The ampullary region that represents the major portion of the lateral tube
-
- The spinal cord derives from the neural tube in two processes: primary and secondary neurulation.
- The neural folds pinch in towards the midline of the embryo and fuse together to form the neural tube.
- For a short time, the neural tube is open both cranially and caudally.
- At the dorsal end of the neural tube, BMPs are responsible for neuronal patterning.
- Shh secreted from the floor plate creates a gradient along the ventral neural tube.
-
- Following gastrulation, the neurulation process develops the neural tube in the ectoderm, above the notochord of the mesoderm.
- Neurulation is the formation of the neural tube from the ectoderm of the embryo.
- By the end of the fourth week of gestation, the open ends of the neural tube (the neuropores) close off.
- It is
the process by which the neural tube at the lower levels and the caudal to the
mid-sacral region is formed.
- Transverse sections that show the progression of the neural
plate into the neural tube.
-
- The neural tube develops in two ways: primary neurulation and secondary neurulation.
- Mammalian neural tubes close in the head in the opposite order that they close in the trunk.
- In the trunk, overlying ectoderm closes, the neural tube closes and neural crest cells migrate.
- For a short time, the neural tube is open both cranially and caudally.
- (Neural tube is in green. )