摘要:
A family of compounds has been found to be useful for right-shifting hemoglobin towards a low oxygen affinity state. The effect has particular application in radiation oncology applications. The compounds are capable of acting on hemoglobin in whole blood.
摘要:
A method is described for the chemical modification of pre-shaped hydrogels in non-aqueous medium. The conditions permit the reaction of highly expanded, porous hydrogel particles, such as spherical beads, using pseudo homogeneous reaction conditions in the absence of water. The method involves a three step procedure in which the porous gels are solvent exchanged int a water-free solvent (step 1) with minimal change in gel dimension and porosity; followed by reaction under non-aqueous condition (step 2); and followed by solvent exchange into water (step 3). Many different types of reactions requiring non-aqueous conditions may be carried out using these conditions. The method has particularly been demonstrated for crosslinking fluorinating beads, and for esterifying beads in a reaction involving multifunctional free carboxylic acids in the presence of dicyclohexylcarbodiimide (DCC).
摘要:
Metered dose inhaler (MDI) formulations which utilize 1,1,1,2-tetrafluoroethane (HFC 134a) as the sole propellant are made practical by including a polar surfactant such as polyethylene glycol, diethylene glycol monoethyl ether, polyoxyethylene (20) sorbitan monolaurate, polyoxyethylene (20) sorbitan monooleate, propoxylated polyethylene glycol, and polyoxyethylene (4) lauryl ether for suspending, solubilizing, wetting and emulsifying the drug constituent and lubricating the valve components of the MDI.
摘要:
A full-bridge zero-voltage-switching pulse-width-modulated converter employs a saturable reactor in place of the linear inductor in order to reduce current stress on the active switches, reduce voltage stress on the rectifier diodes, and reduce secondary parasitic ringing. The zero-current-switching full-bridge pulse-width-modulated converter embodiment of the invention contemplates the provision of active switches that are zero-current-switched and passive switches, such as diode switches, that are zero-voltage-switched.
摘要:
A new method for preparing commercially valuable polymeric ketones is described. The method employs an .alpha.-amiononitrile as a monomeric unit whereby an amorphous, soluble polymer having protected carbonyl moiety is obtained. Upon deprotecting the carbonyl moiety, a crystalline polymeric ketone is obtained. The method allows production of polymeric ketone materials having aromatic, aliphatic or mixed aromatic/aliphatic backbones.
摘要:
The elastic-port immersion cell (10) is an optical oil immersion vessel which has a flexible latex (or other) sheath (24) protruding from its sidewall. The sheath is affixed to an opening in the wall of the vessel using a collar, O-ring (26) or other connecting means. The base of the vessel is an optical glass window. A sample (20) mounted on to the end of spindle (14) is placed into the cell. The end of the spindle (14), without the sample, is inserted into the sheath and the latex together with the spindle is attached to a goniometer head of a spindle stage such that the spindle is horizontal. Immersion oil (22) that has a refractive index similar to the sample is added to the cell until the sample is totally submerged. Minute features within the sample (20) may then be observed under the microscope as the sample is rotated 360 degrees about a vertical or horizontal axis. The latex sheath prevents the oil from escaping from the cell and also provides the flexibility required to orient and rotate a sample.
摘要:
Fine particles of semi-crystalline ketone-containing aromatic polymers (PEEK, PEKK, etc.) are produced by controlling the rate and conditions of hydrolysis of an amorphous polyarylketimine intermediate. The choice of acid and its concentrations affects the rate of ketimine hydrolysis and subsequent particle formation. In addition, zero or reduced amounts of agitation during hydrolysis has been found to promote the formation of smaller (submicron) sized particles which are spherical in shape, while greater amounts of agitation or shear stress applied during hydrolysis results in nonspherical, larger particles. Carbon fiber reinforced composites were made from aqueous suspensions of these particles that were dispersed or stabilized by a water soluble polymer.
摘要:
A Viscoelastic medium with fibers dispersed throughout eliminates the need for a constraining layer, thus reducing the size and weight of a damping treatment.
摘要:
A subject's eye movement and pupil diameter are measured while the subject is exposed to visual stimuli. The apparatus and method utilizes an eye-look detector to determine a subject's visual examination of a presented image and by computer recording an analysis superimposes icons representing the lookpoints over the image. The apparatus and method are not only of value in running routine tests but also may be used for new experiments.