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  • 1
    Electronic Resource
    Electronic Resource
    Repeated Regeneration of Degraded Red Beet Juice Pigments in the Presence of Antioxidants (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 63 (1998), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Ascorbic, isoascorbic, metaphosphoric, and gluconic acids improved the regeneration of red beet juice pigments after heating, and resulted in greater retention of the pigments during processing and storage. Their effect varied depending on the pH of the juice solutions. Ascorbic and isoascorbic acids allowed for the greatest regeneration at pH 3.8. At pH 6.2, metaphosphoric acid and gluconic acid were more effective. Addition of ascorbic acid once prior to the first heating retained the initial concentration of pigments even after 5 cycles of heating (3 min at 100°C) and regeneration. Control solution lost red pigments completely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1998.tb15678.x
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  • 2
    Electronic Resource
    Electronic Resource
    Ischemia/reperfusion-induced arrhythmias in the isolated rat heart: Prevention by melatonin (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 25 (1998), S. 0 
    Details
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Cardiac arrhythmias during ischemia/reperfusion are believed to be related to free radicals generated in the heart especially during the period of reperfusion. Since melatonin functions as a free radical scavenger and antioxidant, the ability of this molecule to influence cardiac arrhythmias was investigated. The pineal secretory product, melatonin, reduced the incidence and severity of arrhythmias induced by ischemia/reperfusion due to ligation of the anterior descending coronary artery in the isolated rat heart. Melatonin was either infused during both the ischemia and reperfusion periods or only late in the ischemia period and throughout reperfusion. The percentage of hearts that developed cardiac arrhythmias during reperfusion as indicated by the incidence of premature ventricular contraction (PVC) and ventricular fibrillation (VF) were recorded. Melatonin either infused during both the ischemia and reperfusion periods or during essentially the period of reperfusion greatly reduced PVC and VF due to occlusion and reopening the anterior descending coronary artery. Presumably melatonin's beneficial effect in reducing cardiac arrhythmias was due in part to its free radical scavenging activity, which is greatly assisted by the rapidity with which it is taken up into cells. Previous studies have shown that vitamin C is effective in reducing the severity of cardiac arrhythmias induced by ischemia/reperfusion; thus, we also compared the efficacy of melatonin with this well-known antioxidant. Melatonin was more potent than vitamin C in protecting against arrhythmias induced by ischemia/reperfusion. Besides melatonin's function as a broad spectrum free radical scavenger, melatonin may have also reduced cardiac arrhythmias due to its regulation of intracellular calcium levels, i.e., by preventing calcium overloading, or due to its ability to suppress sympathetic nerve function and reduce adrenergic receptor function in the myocardium. Additional studies into the mechanisms of melatonin's action in reducing cardiac arrhythmias due to ischemia/reperfusion or other causes are warranted because of the possible application of this information to humans with heart disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-079X.1998.tb00558.x
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  • 3
    Electronic Resource
    Electronic Resource
    Simultaneous program of natural-cycle in vitro fertilization and cryopreserved-thawed embryo transfer (1996)
    Springer
    Journal of assisted reproduction and genetics 13 (1996), S. 716-721 
    Details
    ISSN: 1573-7330
    Keywords: in vitro fertilization-embryo transfer (IVF-ET) ; natural-cycle IVF ; cryopreserved-thawed ET ; simultaneous program of natural-cycle IVF and cryopreserved-thawed ET (NICE) ; pregnancy rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: This clinical study was designed to identify and compare the pregnancy rates of simultaneous program of natural-cycle IVF and cryopreserved-thawed ET (NICE) with those of natural-cycle IVF and cryopreserved-thawed ET. Methods: All three groups comprised spontaneously ovulating infertile women under the age of 40 and without any male factor present. The NICE program was performed in 36 patients (47 cycles) who had previously undergone IVF-ET resulting in cryopreserved embryos. As control groups, the natural-cycle IVF was performed in 45 patients (80 cycles), and the cryopreserved-thawed ET alone in 29 patients (40 cycles). Results: The cancellation rate of the initiated cycles prior to ET was 19.1% (9/47) in the NICE group, 23.8% (19/80) in the natural-cycle IVF group, and 2.5% (1/40) in the cryopreserved-thawed ET group. The mean number of embryos transferred was 4.0±1.1 (2–5) in the NICE group, 1.0 in the natural-cycle IVF group, and 4.2±1.8 (1–5) in the cryopreserved-thawed ET group. The clinical pregnancy rates per aspiration cycle (32.5%) and per ET cycle (34.2%) in the NICE group were significantly higher than those (14.9, 16.4%) in the natural-cycle IVF group. The clinical and delivered pregnancy rates per ET (34.2, 26.3%) in the NICE group were higher than those (20.5, 15.4%) in the cryopreserved-thawed ET group, without statistical significance. Conclusions: Since the NICE program results in saving the fresh oocyte for patients participating in cryopreserved-thawed ET, more favorable pregnancy rates may be obtained from NICE cycles in women ovulating normally who had previously undergone IVF-ET with embryo cryopreservation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02066425
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  • 4
    Electronic Resource
    Electronic Resource
    The Outcome of Sperm Retrieval and Intracytoplasmic Sperm Injection in Patients with Obstructive Azoospermia: Impact of Previous Tuberculous Epididymitis (1999)
    Springer
    Journal of assisted reproduction and genetics 16 (1999), S. 431-435 
    Details
    ISSN: 1573-7330
    Keywords: obstructive azoospermia ; tuberculous epididymitis ; sperm retrieval ; intracytoplasmic sperm injection ; in vitro fertilization–embryo transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: Our purpose was to investigate the influence of previous tuberculous epididymitis in patients with obstructive azoospermia on the outcome of sperm retrieval and intracytoplasmic sperm injection (ICSI). Methods: Eighty-eight cycles of ICSI were performed in 44 patients with obstructive azoospermia; 16 cycles (7 patients) with tuberculous obstructive azoospermia and 72 cycles (37 patients) with nontuberculous obstructive azoospermia. Results: The rates of fertilization and embryo cleavage were comparable, and there was no significant difference in the clinical pregnancy rate per fresh transfer between the two groups. The rates of embryo implantation and clinical miscarriage were also comparable. Conclusions: Embryo quality and pregnancy outcome in sperm retrieval and ICSI were comparable in both the tuberculous and the nontuberculous obstructive azoospermia patients. Although there was a preponderance of testicular sperm used in the tuberculous obstructive azoospermia group, our results suggest that previous tuberculous epididymitis in patients with obstructive azoospermia does not affect the outcome of sperm retrieval and ICSI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020521625765
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  • 5
    Electronic Resource
    Electronic Resource
    Melatonin Reduces Lipid Peroxidation and Tissue Edema in Cerulein-Induced Acute Pancreatitis in Rats (1999)
    Springer
    Digestive diseases and sciences 44 (1999), S. 2257-2262 
    Details
    ISSN: 1573-2568
    Keywords: OXYGEN FREE RADICALS ; LIPID PEROXIDATION ; CERULEIN ; PANCREATITIS ; MELATONIN
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Since oxygen free radicals and lipidperoxidation have been implicated in the pathogenesis ofan early stage of acute pancreatitis, we examinedwhether melatonin, a recently discovered free-radicalscavenger, could attenuate pancreatic injury inSprague-Dawley rats with cerulein-induced pancreatitis.Acute pancreatitis was induced by four intraperitonealinjections of cerulein (50 μg/kg body wt) given at1-hr intervals. Thirty minutes after the lastcerulein injection, the rats were killed and the degreeof pancreatic edema, the level of lipid peroxidation inthe pancreas, and serum amylase activity were increased significantly. Pretreatment with melatonin (10or 50 mg/kg body wt) 30 min before each ceruleininjection resulted in a significant reduction inpancreatic edema and the levels of lipid peroxidation.Serum amylase activity, however, was notsignificantly influenced by either dose of melatonin.Moreover, we found that cerulein administration wasassociated with stomach edema as well as high levels oflipid peroxidation in the stomach and smallintestine, which were also reduced by melatonin.Melatonin's protective effects in cerulein-treated ratspresumably relate to its radical scavenging ability andto other antioxidative processes induced bymelatonin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026656720868
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrasonic devulcanization of waste rubbers: Experimentation and modeling (1996)
    Springer
    Rheologica acta 35 (1996), S. 616-630 
    Details
    ISSN: 1435-1528
    Keywords: Rubber ; devulcanization ; revulcanization ; ultrasound ; cavitation ; viscosity ; model ; experiment ; mechanical properties ; gel fraction ; crosslink density ; pressure drop ; converging flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Continuous ultrasonic devulcanization of ground tire rubber (GRT) and styrene-butadiene rubber (SBR) is considered. Experiments are performed under various processing conditions. Two recipes of SBR with different amounts of polysulfidic linkages are utilized. Gel fraction and crosslink density of devulcanized rubbers are measured and a unique relationship between them is established. Die characteristics with and without imposition of ultrasonic waves are determined. Devulcanized samples are revulcanized and mechanical properties are measured. In some cases, properties of revulcanized SBR samples exceeded those of virgin vulcanizates. This is explained based on the presence of a double network in the revulcanized rubber. A modification of acoustic cavitation and flow modeling of ultrasonic devulcanization of SBR and GRT is proposed using a concept of effective viscosity characterizing the flow of vulcanized particles before devulcanization combined with a shear rate, temperature and gel fraction-dependent viscosity of devulcanized rubber. Velocity, shear rate, pressure, and temperature field along with gel fraction, crosslink density and number of bonds broken are simulated. Predicted data on gel fraction, crosslink density, and pressure using the present modification of the model are found to be closer to experimental data then previously reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396511
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of zeolite rho: Aging temperature effect (1996)
    Springer
    Journal of porous materials 3 (1996), S. 151-155 
    Details
    ISSN: 1573-4854
    Keywords: zeolite rho ; aging temperature effect ; crystallization kinetics ; crystal size
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper focuses on deciphering the gel aging temperature effect on the crystallization of zeolite rho(RHO). Increased gel aging temperature (from room temperature to 55°C and no aging) caused an increase in induction periods and decreased the crystallization rate during the synthesis of RHO. Other crystalline phases such as chabazite were formed along with increasing aging temperature. The largest crystal size of RHO increased proportionally to aging temperatures up to about 9 μm. These results suggest that aging temperature greatly affected the crystallization, the crystal sizes, the purity and the formed crystalline phases during the synthesis of zeolite rho. This study suggests that most of RHO nuclei are formed during gel aging and their formation is depressed by the increased aging temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01134026
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical conductivity change of polyaniline-dodecyl benzene sulfonic acid complex with temperature (1996)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 7 (1996), S. 599-603 
    Details
    ISSN: 1042-7147
    Keywords: polyaniline ; electrical conductivity ; dodecylbenzene sulfonic acid ; doping ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Polyaniline-dodecylbenzene sulfonic acid (PAn-DBSA) complex was thermally treated and its conductivity and structure change were investigated. The conductivity increased linearly from 1.1 × 10-4 to 3.0 × 10-1 S/cm on thermal heating until 140°C, but decayed above 200°C. The increase was caused by an additional thermal doping resulting from an increasing mobility of undoped dopants. After the thermal doping, the formation of the layered structure of PAn-DBSA is made. The decrease was caused by the thermal decomposition of dopants. The conductivity changes at a high temperature was strongly dependent on the nature of the dopant. The results were confirmed by means of X-ray patterns and Fourier transform infrared spectra obtained in the heating and cooling processes of polyaniline.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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