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161.
The possibility of obtaining immobilized horseradish peroxidase (HRP) materials with K'(m) values close to that of the native enzyme, but with good thermal stability, was investigated. The photochemical reaction was used as the immobilization methodology. Temperature and catalyst concentration were found to be the main parameters able to control the immobilization reaction mechanism more than type of functional monomer, polymer-matrix, and enzyme-polymer ratios. By carrying out the immobilization reaction at 35 degrees C and using either bisacryloylpiperazine (BAP) or hexhydro-1,3,5-triacryloyl-s-triazine (HTsT) as the functional monomer, materials with a good thermal stabilization (the retained activity after 240 min at 60 degrees C was between 65-25%) as well as kinetic constants (0.6-0.8 x 10(-4)M) similar to that of the free enzyme (0.57 x 10(-4)M) were obtained. Since low K'(m) values were obtained also using a high polymer content (pBAP copolymers, 25%; pHTsT copolymers, 30%) and neither limitation to substrate diffusion nor a reduction of the enzyme mobility was found, the enzyme should be linked to the matrix during the last steps of monomer polymerization, and it should have an external disposition with respect to the support. 相似文献
162.
J L Lacuara R D Ruiz M Fiol de Cuneo 《Canadian journal of physiology and pharmacology》1985,63(4):283-286
The effects of piretanide upon mechanical activity and pharmacological reactivity of vascular and myocardial tissues from normotensive rats were investigated. Magnitude of phasic contractions of isolated rat portal vein was diminished by the drug in a dose-related manner; contractile depression induced by piretanide (10(-4)M) was less in the presence of insulin (0.1 U/mL), glucose (22 mM) or pyruvate (5 mM). Responses to KCl (90 mM), or norepinephrine (2.5 X 10(-5)M) were also reduced. Contractile activity of atria and ventricle strips was diminished only when piretanide reached 10(-4)M. Results support direct actions of piretanide upon cardiac and vascular tissues. Possible mechanisms of action are discussed. 相似文献
163.
Photoaffinity labelling of androgen receptors with 17 beta-hydroxy-17 alpha-[3H]methyl-4,9,11-estratrien-3-one 总被引:1,自引:0,他引:1
A O Brinkmann G G Kuiper W de Boer E Mulder H J van der Molen 《Biochemical and biophysical research communications》1985,126(1):163-169
The synthetic androgen 17 beta-hydroxy-17 alpha-[3H]methyl-4,9,11-estratrien-3-one (R1881) has been used as photoaffinity label to characterize androgen receptors in calf uterus and rat prostate. Polyacrylamide gel electrophoresis under denaturing conditions showed that the DNA-binding form of the androgen receptor in calf uterus cytosol is a protein with a molecular mass of 98 kD. In rat prostate cytosol an androgen receptor with a molecular mass of 46 kD could be photoaffinity labelled with R1881. The photoaffinity labelling procedure described here provides a method for studying the hormone binding domain of androgen receptors in partial purified preparations. 相似文献
164.
Effect of chemical modifications on the K99 and K88ab fibrillar adhesins of Escherichia coli 总被引:6,自引:0,他引:6
The role of specific amino acid residues of the K88ab and K99 fibrillar adhesins in the binding to erythrocytes and antibodies has been studied by chemical modification. It appeared that: (1) The integrity of the single disulfide bridge in the K99 subunits is essential for the binding of the fibrillae to the glycolipid receptors, but not for the recognition and binding of specific anti-K99 antibodies. (2) Modification of one lysine residue per subunit with 4-chloro-3,5-dinitrobenzoate results in the loss of the adhesive capacity of K99 fibrillae. Lysine residue are not important for the adhesive activity of K88ab fibrillae. Three or five lysine residues per subunit, respectively, can be modified without an effect on the immunological properties of the K99 and K88ab fibrillae. (3) Limited reaction of K99 and K88ab fibrillae with 2,3-butanedione destroys the adhesive activity of both fibrillae. This inactivation corresponds with the loss of one (K99) or two (K88ab) arginine residues per subunit. Ultimately, in K99 three, and in K88ab four, arginine residues per subunit can be modified without affecting the binding of specific antibodies. (4) Modification of five out of the nine carboxyl groups contained in the K99 subunit suppresses the recognition of specific anti-K99 antibodies, but carboxylates are not important for the adhesive activity of K99 fibrillae. Modification of two additional carboxylates in K99 results in an insoluble product. (5) Tyrosine residues are most probably not present in the adhesive or antigenic sites of K99 fibrillae. Modification of six out of the ten tyrosine residues in the K88ab subunit results in a decrease in adhesive activity but has no effect on the reaction with anti-K88ab antibodies. 相似文献
165.
An adapted version of the Ca2+-influx assay of Weissmann et al. (Weissmann, G., Anderson, P., Serhan, C., Samuelson, E. and Goodman, E. (1980) Proc. Natl. Acad. Sci. USA 77, 1506-1510) is presented for studies on the possible ionophoretic properties of acidic phospholipids. This method is based on the use of the metallochromic dye arsenazo III enclosed in liposomal vesicles, to indicate the Ca2+ influx. An essential control is introduced to discriminate between Ca2+-arsenazo III complex formation inside the vesicles, as a consequence of Ca2+ influx, and outside the vesicles, as a consequence of arsenazo III leakage from the vesicles. Furthermore, some minor improvements are added, like the use of large unilamellar vesicles instead of multilamellar vesicles, and the use of dual wavelength spectrophotometry. Using this method, it was found that dioleoylphosphatidylcholine vesicles, containing 20 mol% dioleoylphosphatidylglycerol, were impermeable to Ca2+. In this system a selective Ca2+ permeability could be induced by the addition of the fungal Ca2+ ionophore A23187. In contrast, dioleoylphosphatidylcholine vesicles, containing 20 mol% dioleoylphosphatidic acid, incubated in the presence of Ca2+ were permeable to both Ca2+ and arsenazo III. 相似文献
166.
167.
M O Rethoré M Prieur M C de Blois J Naffah A Ravel E Villain J Lejeune 《Annales de génétique》1985,28(3):149-153
The detection of a familial translocation, t(10;18)(p12;q22), has made possible the observation in type and countertype of two related persons with opposite chromosomal imbalance: trisomy 18q22----18qter with monosomy 10p12----10pter in one of the two and monosomy 18q22----10pter in the other. In each case the abnormalities attributable to monosomy overrule those attributable to monosomy overrule those attributable to the associated trisomy. 相似文献
168.
The polyisoprenols (PIs) dolichol and undecaprenol function as chemical carriers of glycosyl residues in the membrane-directed synthesis of glycoconjugates in prokaryotic and eukaryotic cells. The molecular details of how these lipid cofactors function is unknown. Presented here are results of deuterium NMR investigations of site specifically 2H-labeled PIs incorporated into model membranes. To complement previous omega-terminal PI labeling schemes, a simple synthesis of head group 2H-labeled PIs is presented in which a PI alcohol is esterified with deuterated acetyl chloride. The 2H-labeled PIs, when incorporated into multilamellar membranes composed of phosphatidylcholine, gave rise to 2H NMR powder patterns interpretable in terms of quadrupole splittings (delta vQ) and spin-lattice relaxation times (T1s). Pure isomers of head group 2H-labeled geraniol (C10) and solanesol (C45) gave rise to single splittings while farnesol (C15) gave rise to two sets of splittings due to cis-trans isomerization at the polar terminal double bond. Membranes containing C45 solanesol exhibited a large isotropic component, indicative of limited partitioning of this poly trans PI into the membrane. T1 measurements revealed high rates of motion for PIs relative to cholesterol in similar membrane hosts and revealed correlation times close to the fatty acyl methyl termini in phosphatidylcholine. The smaller PIs showed higher rates of motion but the T1s of head and tail labels were similar. These data indicate that both ends of the esterified PI molecules see similar environments, probably in the bilayer interior, and suggest that the esterified PIs studied here do not appear to adopt a conventional head group-at-interface orientation of lipids within the bilayer. 相似文献
169.
Application of an acid solution to the dorsal skin of conscious toads having intact nervous system induces a scratching reflex and escape movements, as well as autonomic alterations (hypertension and tachycardia) that are part of the defense response. The motor components of this response are abolished or reduced by microinjection of 60, 30, 15 or 7.5 ng carbachol into the midbrain tegmentum. The cardiovascular components, however, continue to be present, although their amplitude is reduced. The depression of the motor response is statistically significant up to 15 minutes for the 60 ng dose, up to 10 minutes for the 15 and 30 ng doses, and only up to 5 minutes for the 7.5 ng dose. The data suggest that the midbrain tegmentum may modulate the reflex motor response triggered by a noxious stimulus and also participate in the organization of the escape movements. The importance of cholinergic agents in this modulation is discussed. The persistence of the cardiovascular component of the response shows the importance of this parameter as an indicator of alert situations. 相似文献
170.
A new dimension to observations in minirhizotrons: A stereoscopic view on root photographs 总被引:3,自引:0,他引:3
Summary With a stereoscope, as used for the inspection of aerial photographs, sequential photographs of roots obtained by the endoscope method from minirhizotrons can yield much more information than hitherto. A series of photographs shows that most of the roots seen in a minirhizotron in grassland grew on the surface of the lexan tube, while there was a gap between the roots and the soil. Decay of the extensive root hair zones around the roots may make new root growth in the gap between rhizotron wall and soil invisible. Some consequences of these observations for the endoscope method are discussed. 相似文献