摘要:
A heating element for an infrared heater is made from an elongat e strip (1) of sheet metal such as nickel chrome. The strip (1) has a constant or varying cross-sectional area along its length, for example by having a non-uniform width, in order to provide an electrically resistive heating effect which varies along the length of the element. The strip (1) spans end mountings (2) and is energised by a voltage below 50 volts to provide long wave and medium wave infrared emission.
摘要:
The invention relates to a method for detecting any mutation at a predetermined site occurring in a known nucleic acid sequence. The method uses primer extension analysis to detect the mutation. Unlabeled terminator is supplied along with labeled non-terminator in the primer extension reaction to detect whether the first nucleic acid base on the template strand that is directly opposite the nucleic acid base immediately 3' to a primer is a mutant. In the primer extension reaction, the terminator is complementary to the wild-type base on the template strand that is directly opposite the nucleic acid base immediately 3' to the primer. Non-terminators are the other nucleotides and are labeled. When the terminator is incorporated into the primer extension strand, primer extension reaction terminates. Incorporation of a labeled non-terminator in the primer extension strand indicates that a mutation has occurred at the predetermined nucleic acid base site.
摘要:
An inflatable mattress for supporting patients comprises two inflatable longitudinal tubes (1, 2) extending along the respective longitudinal edges of the mattress and a plurality of inflatable transverse tubes (3, 3'). Each transverse tube (3 or 3') has adjacent its end an aperture (9a), with the longitudinal tube (1) extending through the aligned apertures (9a) at one side of the mattrress and the longitudinal tube (2) extending through the aligned apertures (9a) at the other side of the mattress. The transverse tubes are selectively inflatable in various modes under microprocessor control.
摘要:
A confocal scanning optical microscope system wherein a dispersive optical device such as a prism (28) separates an image from a restricted area of a specimen into a spread of images of differing wavelengths. Different parts of the spread of images are focussed at respective beam-limiting apertures (34, 36) which are conjugate with one another, and the spectrally differing beams passing through the beam-limiting apertures pass to respective detectors (35, 37).
摘要:
An optical attachment unit is described which can be inserted reversibly (31, 32) into the detection light path of a confocal optical microscope, which has the effect of modifying the magnification of the specimen at the level of the detector iris (36). This modification consists in the preferred form of a demagnification, so that high sensitivity is obtained at the expense of confocal function, as is required for multiphoton imaging and other purposes. No optical telescope (30) or other imaging means used for confocal function is disturbed or removed by the operation of inserting the unit, so that the confocal function can be restored reproducibly and rapidly.
摘要:
Resource requests made by clients or origin severs in a network are intercepted by reflector mechanisms and selectively reflected to other severs called repeaters. The reflectors select a best repeater from a set of possible repeaters and redirect the client to the selected best repeater. The client then makes the request of the selected best repeater. The resource is possibly rewritten to replace at least some of the resource identifiers contained therein with modified resource identifiers designating the repeater instead of the origin server.
摘要:
A cassette for a thermal transfer dye ribbon comprises a casing (1) containing bearing means (10) having rotably mounted thereon a cylindrical member (15) having on its periphery a mark (16) carrying information capable of being detected by a sensor on rotation of the member (15) and means operatively engageable with a drive source which is disposed outside the casing to cause rotation of the member.