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141.
Elena Driomina Igor Polnikov Victor Sharov Ofelia Azizova Yury Vladimirov 《Free radical research》1994,20(5):279-288
A chemiluminescence (CL) flash kinetics on the addition of Fe2+ ions into oxidized low density lipoprotein (LDL) suspension has been studied. LDL oxidation was carried out at 37°C without and in the presence of 5 or 50 μM of Cu.2+ It has been found that under certain experimental conditions (the addition of excess iron ions, more than 1 mM) the amplitude of CL flash depended almost linearly (1) on the concentration of oxidized LDL and (2) on the extent of LDL oxidation measured as diene conjugates (DC) and 2-thiobarbituric acid-reactive substance (TBARS) accumulation. The corresponding correlation coefficients were: for TBARS - 0.94 and for DC - 0.97, in the case of LDL autooxidation; 0.72 and 0.98, in the case of copper-induced LDL oxidation. A sensitivity of the CL method was shown to be significantly enhanced (by more than two orders) in the presence of CL sensitizer - 2, 3,5, 6-lH,4H-tetrahydro-9-(2' -benzoimidazolyl)-quinolizin-(9, 9a, 1 -gh)coumarin. 相似文献
142.
Kinetics of microbial growth with mixtures of carbon sources 总被引:11,自引:0,他引:11
143.
Twelve of 24 monospecific caprine reagents produced by absorption of alloimmune antisera identified a complex blood group
system of goats which was designated B, based on the results of a small comparison test with ovine reagents. The frequencies
of the 12 B factors differed significantly among the Australian Angora, Texan Angora, Cashmere, and Dairy goat breeds. Three
of the antigens detected by the reagents were shown to be related as linear subtypes, designated Ba1, Ba2, and Ba3, and inherited as alleles. The segregations of B factors in 80 sire groups involving 1086 offspring demonstrated that groups
of B factors (phenogroups) segregated as products of allelic genes.
This work was supported by a grant from the Australian Stud Book, Alison Road, Randwick, New South Wales 2031, Australia. 相似文献
144.
Gluco-oligosaccharides were synthesized through the enzymatic condensation of D-glucose at high concentration using a commercial almond beta-glucosidase. The synthesis reactions were carried out with both free and immobilized enzyme, with or without sorbitol, an efficient depressor of water activity (a(w)) in the presence of different glucose concentrations. The yield and the composition of the gluco-oligosaccharides produced changed with the reaction mixture and the form of the enzyme used (free or immobilized). The use of 5 M glucose solution permitted only disaccharides to be obtained, whereas with a glucose concentration of 7.5 M glucose, di-, tri-, and tetrasaccharides were produced. A 7.5 M glucose solution used with 4.4 M sorbitol gave three times more disaccharides than the same solution without sorbitol. Moreover, the immobilized enzyme was much more active in synthesis. The synthesis yield (oligomers mg/mL . mg of enzyme) after immobilization was 573% compared to that of the free enzyme, when a 7.5 M glucose solution was tested. The effects of substrate concentration, sorbitol addition and enzyme immobilization were investigated. (c) 1993 John Wiley & Sons, Inc. 相似文献
145.
Park YS Shiba S Lijima S Kobayashi T Hishinuma F 《Biotechnology and bioengineering》1993,41(9):854-861
Cloned gene expression in recombinant Saccharomyces cerevisiae 20B-12 containing three different plasmids was compared in batch and fed-batch cultures. The plasmids pNA3, pNA7, and pNA9 contain the alpha-amylase gene under the control of SUC2, PGK, and GAL7 Promoters, respectively. The synthesis of alpha-amylase was therefore induced by low glucose concentration for the SUC2 and PGK promoters, and by galactose for GAL7 promoter. The specific cell growth rates were similar among cells harboring the three different plasmids; they decreased from 0.35 to 0.38 h(-1) during the cell growth phase to 0.03 to 0.06h(-1) during the production phase. The secretory alpha-amylase activity of cells harboring plasmid pNA7 was 129 U/mL in fed-batch culture, which was 1.4 and 2 times as high as the activities of cells harboring plasmids pNA3 and pNA9, respectively. The secretion ratios (amount of extracellular alpha-amylase activity/amounts of total alpha-amylase activity) of cells harboring plasmids pNA3, pNA7, and pNA9 were 91.4%, 94.5%, and 95.3%, respectively. (c) 1993 Wiley & Sons, Inc. 相似文献
146.
Tokuo Ogawa Junichi Sugenoya Norikazu Ohnishi Keiko Natsume Kazuno Imai Yoshikazu Kandori Akira Ishizuka Atsushi Osada 《European journal of applied physiology and occupational physiology》1993,67(4):354-359
We have examined the nonparallel changes in tampanic membrane temperatures (T
ty) from the two ears in response to various changes in body and head positions. Upon assuming a lateral recumbent position, the T
ty on the lower side increased while that on the upper side decreased. Pressure application over a wide area of the lateral chest only caused inconsistent and obscure asymmetric changes in T
ty. A lateral flexion of the head with the subject sitting upright and a rotation of the head to the side in a supine position induced an increase in the T
ty on the lower side compared to that on the upper side. The temperature and blood flow of the forehead often decreased on the lower side and increased on the upper side, although such responses were not always concomitant with the asymmetric changes in T
ty. A dorsal flexion of the head with the subject in a reclining position caused a slight increase in the T
ty, whereas raising the head upright induced a slight decrease in them. Two additional experiments were carried out with single photon emission computed tomography using 99mTc-hexamethylpropyleneamine oxime as tracer, and a slight, relative decrease in counts was noted in the right hemisphere during rotation of the head to the right. These results would strongly suggest that unilateral increases and decreases in T
ty could have been caused by one-sided decreases and increases, respectively, in blood flow to the brain and/or the tympanic membrane, induced by a vasomotor reflex involving vestibular stimulation. 相似文献
147.
J. Iba?ez R. Rama M. Riera M. T. Prats L. Palacios 《European journal of applied physiology and occupational physiology》1993,67(1):7-13
The effect of severe acute hypoxia (fractional concentration of inspired oxygen equalled 0.104) was studied in nine male subjects performing an incremental exercise test. For power outputs over 125 W, all the subjects in a state of hypoxia showed a decrease in oxygen consumption (
O2) relative to exercise intensity compared with normoxia (P < 0.05). This would suggest an increased anaerobic metabolism as an energy source during hypoxic exercise. During submaximal exercise, for a given
O2, higher blood lactate concentrations were found in hypoxia than in normoxia (P < 0.05). In consequence, the onset of blood lactate accumulation (OBLA) was shifted to a lower
O2 (
O2 1.77 l·min–1 in hypoxia vs 3.10 l·min–1 in normoxia). Lactate concentration increases relative to minute ventilation (
E) responses were significantly higher during hypoxia than in normoxia (P < 0.05). At OBLA,
E during hypoxia was 25% lower than in the normoxic test. This study would suggest that in hypoxia subjects are able to use an increased anaerobic metabolism to maintain exercise performance. 相似文献
148.
The localization of neuropeptide Y (NPY) and atrial natriuretic peptide (ANP) in the endothelial cells of human umbilical blood vessels was studied using the pre-embedding peroxidase-antiperoxidase (PAP) technique for electron microscopy and avidin-biotin-complex (ABC) immunostaining for endothelial cells cultured from umbilical vein. Subpopulations of NPY- and ANP-immunoreactive endothelial cells were present in term umbilical vein and artery. The umbilical vein contained more positive cells than the artery. The percentage of NPY- and ANP-immunoreactive umbilical vein cells in culture was 32% and 44%, respectively, out of a total of 3013 cells examined. The possibility that these potent vasoactive substances located in the endothelial cells of the non-innervated umbilical vessels are involved in the local regulation of blood flow is discussed. 相似文献
149.
Shinya Arinaga Nobuya Karimine Masashi Adachi Hiroshi Inoue Shigeru Nanbara Tsukasa Asoh Hiroaki Ueo Tsuyoshi Akiyoshi 《Cancer immunology, immunotherapy : CII》1993,37(4):220-226
We previously found that the ability of peripheral blood mononuclear cells (PBM) of cancer patients to generate lymphokine-activated killer (LAK) cells became remarkably augmented after mitomycin C administration. On the basis of the clinical finding, we designed a treatment regimen comprised of 12 mg/m2 mitomycin C i. v. on day 1 and 700 U/m2 recombinant interleukin-2 (IL-2) i.v. every 12 h from day 4 through day 8. Of 25 patients with advanced carcinoma, 9 had a partial response and 3 had a minor response. Cytotoxic cell function, including natural killer activity, lymphokine-activated killer (LAK) activity, and the ability to generate LAK cells, and lymphocyte subsets in PBM was measured 1 day before and after either the first or second course of this therapy. The relationship between these parameters and the clinical antitumor response to this treatment was examined. Although the cytotoxic activities were significantly augmented after either the first or second treatment course, no positive correlation was observed between the changes in these cytotoxic activities and the clinical response to this therapy, when patients who either showed a partial response or whose disease remission was partial or minor were defined as responders. Further, phenotypic analysis showed a significant increase in CD2+, CD3+ CD4+ and CD4+Leu8– cells after the firs course, and CD25+ cells after either the first or second course of this treatment. The precentages of CD2+ and CD25+ cells were significantly elevated only in responders but not in nonresponders, suggesting the increase in these subsets was related to clinical response. 相似文献
150.