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A biosafety cabinet (BSC)—also called a biological safety cabinet or microbiological safety cabinet—is an enclosed, ventilated laboratory workspace for safely working with materials contaminated with (or potentially contaminated with) pathogens requiring a defined biosafety level.
Essential features of a biosafety level 4 (BSL-4) laboratory [1] A biosafety level (BSL), or pathogen/protection level, is a set of biocontainment precautions required to isolate dangerous biological agents in an enclosed laboratory facility. The levels of containment range from the lowest biosafety level 1 (BSL-1) to the highest at level 4 ...
The kinetochore is composed of several layers, observed initially by conventional fixation and staining methods of electron microscopy, [13] [14] (reviewed by C. Rieder in 1982 [15]) and more recently by rapid freezing and substitution.
A deadlocking latch bolt (deadlatch) is an elaboration on the latch bolt which includes a guardbolt to prevent "shimming" or "jimmying" of the latch bolt. When the door is closed, the latch bolt and guardbolt are retracted together, and the door closes normally, with the latch bolt entering the strike plate.
Edward Hitchcock's fold-out paleontological chart in his 1840 Elementary Geology. Although tree-like diagrams have long been used to organise knowledge, and although branching diagrams known as claves ("keys") were omnipresent in eighteenth-century natural history, it appears that the earliest tree diagram of natural order was the 1801 "Arbre botanique" (Botanical Tree) of the French ...
Examples [1] of safety-critical systems. From left to right, top to bottom: the glass cockpit of a C-141 , a pacemaker , the Space Shuttle and the control room of a nuclear power plant . A safety-critical system [ 2 ] or life-critical system is a system whose failure or malfunction may result in one (or more) of the following outcomes: [ 3 ] [ 4 ]
Sliding glass door frames are often made from wood, aluminum, stainless steel, or steel, which also have the most strength. The most common material is PVC plastic. Replacement parts are most commonly needed for the moving-sliding parts of the door, such as the steel rollers that glide within the track and the locking mechanisms.
Detailed diagram of lipid bilayer of cell membrane The cell membrane , or plasma membrane, is a selectively permeable [ citation needed ] biological membrane that surrounds the cytoplasm of a cell. In animals, the plasma membrane is the outer boundary of the cell, while in plants and prokaryotes it is usually covered by a cell wall .