Coupling gel

Yamamoto et al. also coupled gel permeation HPLC and CE in an on-line fashion in 1990, where capillary isotachophoresis was again used in the second dimension. This technique was also not comprehensive due to the loss of resolution between the techniques. It was also not particularly fast, with a 23 min CE cycle, which was repeated 90 times throughout the HPLC run (14). Volume incompatibility between HPLC and CE was one problem not addressed in this study, in which a large HPLC column was coupled to an electrophoresis capillary. 

Balke ST, Patel RD (1983) Orthogonal chromatography. Polymer cross-fractionation by coupled gel permeation chromatographs. In Craver CD (ed) Polymer characterization. Adv Chem Ser 203, American Chemical Society, Washington, DC... 

For sonophoretic delivery, the desired drug is dissolved in a solvent and applied on the skin. Ultrasound is applied by contacting the transducer with the skin (Figs. lA-C) through a coupling medium to ensure a proper contact between the transducer and the skin. This medium can be the same as the solvent used to dissolve the drug or it can be a commercially available ultrasound coupling gel (for example, Aquasonic, Polar, NJ). 

Section 7 introduces a recently developed on-line coupled gel permeation chromatography (GPC) and NMR system, in which a 500-MHz H NMR spectroscopy is used as a detector for GPC. The system facilitates evaluation of molecular weight dependence of polymer characteristics such as tacticity and comonomer composition and determination of molecular weight without using standard polymer samples. 

We have first verified that, in absence of chemicaf reactions, our dynamical equation for the gel reproduces the dramatic slowing downs in the transition rates which have been observed near the critical point or the spinodal limits of hydrogels. In the last section, we discuss an example of the instabilities that give rise to the self-oscillating behavior of the coupled gel-chemical system and we exhibit corresponding bifurcation diagrams. 

Due to several side reactions, especially in radical polymerization - such as elimination or radical coupling - gel formation can in many cases not be avoided. One of the main advantages of the SCVP is the unequal reactivity of the chain-growth and the step-growth processes. This allows an architectural tailoring of the DB due to unequal reactivity of the end groups A and B compared to Conventional AB2-polycondensations with a restricted DB of 50%. Frechet and co-workers were able to... 

The optimal polymer material for use in ultrasound medical devices would have an impedance matching that of human tissue, 1.5 MRayls, and minimal attenuation at the frequencies of interest, which are typical between 5 and 10 MHz. Use of a material with a large impedance mismatch against tissue results in reflection of energy at the tissue/transducer interface, or more likely, the interface between the coupling gel, which is often silicone or a hydrogel, and the device lens. A polymer with an impedance mismatch and low attenuation can result in multiple... 

Goedhar, D. Opshoor, A. Polymer characterization by coupling gel-permeation chromatography and automatic visco-metry. J. Polym. Sci. A-2 1970, 8 (7), 1227-1233. 

Coupling Gel Gel placed on the skin to fecilitate contact of the transducer with underlying structures. 

Subindustries. Ultrasound supports a number of subindustries, including maintenance and repair. Ultrasound equipment is connected to devices such as printers, photographic equipment, and video recorders. Consumables must be replenished. These include coupling gel, film, videotapes, and printer paper. Needles and syringes are necessary for performing an amniocentesis. A number of specialized instruments are manufactured for tissue biopsy or ovum extraction. Textbooks and other educational resources are purchased by practitioners. Other educational material is marketed for the public. 

The methodology of Lubineau was also used by Tellier to graft acar-bose to Affigel-10 activated by NHS. The coupled gel was used to purify anti-Tendamistat polyclonal antibodies by cross reacting with acarbose. Since acorbose and Tendamistat are respectively carbohydrate and proteinaceous inhibitor to a amylase, the purified polyclonal antibodies were considered as good candidates for a amylase mimics. ... 

To make a scan the transducer is contacted to the skin using a coupling gel, and the examination consists of moving the probe gently across the surface of the abdomen. For the liver, subcostal views in transverse and longitudinal directions are convenient and access may be improved if the patient holds a deep breath. No preparation is needed for liver scans but the gallbladder is easier to assess when distended in the fasting state. 

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