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51.
研究了苏乐康、绿茶提取物对~(60)钴γ射线和雌性激素联合诱发叙利亚金黄地鼠胚胎细胞恶性转化的抑制能力,并用脉冲辐解技术,对其抑制机制进行初步探讨。实验结果表明,苏乐康、绿茶提取物对γ射线和雌性激素联合诱发的金黄地鼠胚胎细胞恶性转化的抑制率分别为70.15%(P<0.05)和81.59%(P<0.05),它们的这种抑制能力与其清除超氧阴离子的能力有关, 相似文献
52.
E. Valic Thomas Waldhör Christoph Konnaris Albert Michitsch Christian Wolf 《International archives of occupational and environmental health》1997,70(6):403-406
Hypothesis: Does occupational exposure to solvents in combination with alcohol intake give rise to acquired color vision defects? Method: A total of 138 individuals exposed to solvents (toluene, xylene, trichloroethylene, tetrachloroethylene) were examined using Lanthony’s D-15 test and compared with 100 nonexposed controls. The extent of color vision loss was quantitatively assessed based on Bowman’s color confusion index (CCI). A cumulative exposure index was calculated from the hours of exposure per day and the years of exposure. In 30 persons who were exposed to trichloroethylene and tetrachloroethylene, urinary trichloroacetic acid was assessed as a parameter of exposure. Alcohol intake was calculated as based on interviews of patients in grams of ethyl alcohol per week. Results: Individuals who consumed more than 250 g alcohol/week and were simultaneously exposed to solvents showed a significantly elevated CCI (P = 0.0044). No significant correlation emerged between trichloroacetid acid excretion in the urine or the cumulative exposure index and the CCI. Conclusion: The combination of alcohol intake and occupational exposure to solvents discloses the risk of acquired subclinical color vision defects. 相似文献
53.
Thirty-four social drinkers who had referred themselves to the Regional Brain Damage Unit for assessment of the effects of drinking alcohol were compared with 42 volunteer control subjects of equivalent age but with low alcohol intake, using two 'learning' tests — the Rey Auditory Verbal Learning Test (RAVLT) and the Austin Button Maze. The Maze Test gave no evidence of disorder, but the two groups were significantly different on the RAVLT. No abnormalities in standard cognitive tests were apparent. These results suggest that a deficit in learning ability may be an early feature of the brain dysfunction associated with excessive alcohol consumption. 相似文献
54.
Jennie Ponsford Rochelle Whelan-Goodinson Alex Bahar-Fuchs 《Brain injury : [BI]》2007,21(13):1385-1392
Primary objectives: To establish pre-morbid alcohol and drug use in persons with TBI, relative to controls, investigate how patterns of substance use change over time following TBI and identify factors associated with heavy post-injury substance use.
Methods and procedures: The Alcohol Use Disorders Identification test (AUDIT) and Drug Abuse Screening Test (DAST) was completed by 121 hospital inpatients with TBI, documenting pre-injury alcohol and drug use, and 133 demographically similar controls. Participants with TBI completed these measures and the Hospital Anxiety and Depression Scale (HADS) again 1 and 2 years post-injury and 76 also completed them at 3 years.
Results: Participants with TBI showed similar levels of drug and alcohol use to controls pre-injury, with 31.4% of the TBI group and 29.3% of controls drinking at hazardous levels. Alcohol and drug use declined in the first year post-injury, but increased by 2 years post-injury, with only 21.4% of participants with TBI reporting abstinence from alcohol and 25.4% drinking at hazardous levels. Only 9% showed a drug problem, but 24% had returned to some drug use. Those showing heavy alcohol use post-injury were young, male and heavy drinkers pre-injury. Drug and alcohol use was similar at 3 years post-injury.
Conclusions: More active intervention is needed to reduce alcohol and drug use following TBI. 相似文献
Methods and procedures: The Alcohol Use Disorders Identification test (AUDIT) and Drug Abuse Screening Test (DAST) was completed by 121 hospital inpatients with TBI, documenting pre-injury alcohol and drug use, and 133 demographically similar controls. Participants with TBI completed these measures and the Hospital Anxiety and Depression Scale (HADS) again 1 and 2 years post-injury and 76 also completed them at 3 years.
Results: Participants with TBI showed similar levels of drug and alcohol use to controls pre-injury, with 31.4% of the TBI group and 29.3% of controls drinking at hazardous levels. Alcohol and drug use declined in the first year post-injury, but increased by 2 years post-injury, with only 21.4% of participants with TBI reporting abstinence from alcohol and 25.4% drinking at hazardous levels. Only 9% showed a drug problem, but 24% had returned to some drug use. Those showing heavy alcohol use post-injury were young, male and heavy drinkers pre-injury. Drug and alcohol use was similar at 3 years post-injury.
Conclusions: More active intervention is needed to reduce alcohol and drug use following TBI. 相似文献
55.
We have established a rat model that reflects the course of development of alcohol and opiate addiction. The present study
with d-amphetamine aimed to define general principles in the development of an addiction. Male rats had a continuous free choice
between d-amphetamine solutions (100, 200 and 400 mg/l) and water for 47 weeks. An initial intake of high doses of d-amphetamine during the first weeks of drug choice was followed by an individually stable pattern of drug consumption of moderate
drug doses. During this period of controlled consumption (from week 10 to week 40), the voluntary intake of d-amphetamine depended on individual factors (dominant rats: 0.37 ± 0.02 mg/kg per day, subordinate rats: 0.57 ± 0.05 mg/kg
per day) and environmental variables (group housing: 0.21 ± 0.02 mg/kg per day, single housing: 0.41 ± 0.03 mg/kg per day).
Beginning with week 41, voluntary d-amphetamine consumption progressively increased (1.9 ± 0.2 mg/kg per day in week 47), although the experimental conditions
remained unchanged. Drug intake during a retest (free choice as before) after 6 months of drug deprivation revealed that the
rats had persistently lost their control over drug intake and were no longer able to adjust drug taking to internal and external
conditions. These addicted rats took very high drug doses, even when all d-amphetamine solutions but not water were adulterated with bitter tasting quinine (6.6 ± 0.6 mg/kg per day; age-matched controls:
0.37 ± 0.04 mg/kg per day). Forced intake of d-amphetamine for 47 weeks (7.1 ± 0.3 mg/kg per day) via the drinking fluid caused physical dependence (hyperreactivity during
withdrawal) but did not lead to drug addiction (voluntary intake in the retest with adulteration: 0.42 ± 0.04 mg/kg per day).
Both the temporal development and the prerequisites of psychostimulant addiction were in principle the same as for alcohol
and opiates.
Received: 3 April 1998/Final version: 26 August 1998 相似文献
56.
Herbert J. Weingartner Robert Rawlings David T. George Michael Eckardt 《Psychopharmacology》1998,138(3-4):311-317
This study was designed to examine and contrast cognitive effects (explicit memory and access to semantic knowledge) of the
benzodiazepine Halcion (triazolam) in ten normal volunteers and ten cognitively unimpaired detoxified alcoholics. The two
groups were indistinguishable from one another under placebo conditions on all measures of cognitive functioning. Under Halcion
test conditions (0.375 mg PO), both groups were about equally impaired in their recall of to-be-remembered information. However,
alcoholics, were more likely to recall information that they were not asked to remember (intrusion errors) on all measures
of explicit remembering. Alcoholics also generated relatively uncommon (low frequency) responses from semantic memory, rather
than common, categorically related associations in response to stimuli such as types of vegetables, flowers, and fruit following
the administration of Halcion, but were not different from normal volunteers in the types of responses generated under placebo
conditions. These findings suggest that a drug challenge that simulates many of the effects of acute alcohol administration
induces alcoholics to think and remember differently (qualitatively) from normal volunteers.
Received: 7 July 1997 / Final version: 22 September 1997 相似文献
57.
Reinstatement of alcohol-seeking by priming injections of alcohol and exposure to stress in rats 总被引:10,自引:5,他引:5
A. D. Lê B. Quan W. Juzytch P. J. Fletcher N. Joharchi Y. Shaham 《Psychopharmacology》1998,135(2):169-174
Previous studies using a reinstatement procedure have found that acute reexposure to the self-administered drug and exposure
to footshock stress reinstate heroin and cocaine seeking after prolonged drug-free periods. Here we tested whether these findings
generalize to alcohol-taking behavior. Male rats were initially allowed to consume alcohol in a two-bottle choice procedure
(water versus alcohol) for 30 min/day for 36 days. Rats were then trained for 60 min/day in operant chambers to press a lever
for the drug (0.13 ml of 12% w/v of an alcohol solution) for up to 55 days. After stable drug-taking on a fixed-ratio-3 schedule
of reinforcement was obtained, lever pressing for alcohol was extinguished by terminating drug delivery for 4–9 days. Reinstatement
of drug seeking was then determined after non-contingent priming injections of alcohol (0.24 and 0.48 g/kg; given IP and orally)
or exposure to intermittent footshock stress (5 and 15 min; 0.8 mA). Priming injections of alcohol produced a modest dose-dependent
reinstatement of drug seeking, whereas footshock stress potently reinstated extinguished alcohol seeking. In contrast, similar
parameters of footshock failed to reinstate extinguished sucrose-taking behavior in rats previously trained to lever press
for sucrose pellets. These findings extend previous reports on reinstatement of cocaine and heroin seeking by a footshock
stressor and by priming drug injections. It also appears that the reinstatement procedure provides an appropriate methodology
to study relapse to alcohol-taking behavior in the drug-free state.
Received: 9 April 1997 / Final version: 1 August 1997 相似文献
58.
Aaro Leinonen Topi Siniluoto Markku Päivänsalo Ari Karttunen Matti I. Kairaluoma Ilkka Suramo 《European radiology》1993,3(3):213-218
Nineteen patients with 49 symptomatic non-neoplastic non-parasitic simple hepatic cysts were subjected to ultrasonographically guided percutaneous aspiration and temporary injection of 99% ethanol into the cyst. Small cysts were treated twice, the large ones three times at the same sitting. The volume of alcohol per injection varied from 20 to 100 ml, depending on the size of the cyst. A cure was usually achieved with one ethanol sclerotherapy treatment. Only minor side effects such as transient pain and temperature elevation occurred. Forty-seven of the 49 cysts could be treated adequately, and did not recur during a follow-up period af 12–40 months. The results indicate that aspiration an and ethanol sclerotherapy is the treatment of choice in patients with symptomatic non-neoplastic simple hepatic cysts or polycystic liver disease.
Correspondence to: A. Leinonen 相似文献
59.
The role of the ethanol training dose on the ability of the selective 5-HT1 agonist TFMPP (m-trifluoromethylphenylpiperazine) to produce ethanol-like discriminative stimulus effects was evaluated in three groups of rats trained to discriminate 1.0 g/kg (n=5), 1.5 g/kg (n=6) or 2.0 g/kg (n=7) ethanol (IG) from water using a two-lever procedure with food reinforcement available under a fixed ratio 20 (FR 20) schedule. Ethanol generalization gradients were comparable in the three groups, indicating few potency differences in the ethanol stimulus across training dose. However, the ability of TFMPP (0.1–1.7 mg/kg; IP) to substitute for ethanol was dependent on the training dose. TFMPP resulted in partial substitution in the 1.0 g/kg group, complete substitution for 1.5 g/kg group and no substitution in the 2.0 g/kg ethanol training group. The results indicate a serotonergic component to the discriminative stimulus effects of an intermediate dose of ethanol that is not prominent as the dose of ethanol is raised. These data add further support for the hypothesis that ethanol produces a mixed discriminative cue, the components of which are not uniformly amplified when the dose of ethanol is increased. 相似文献
60.
The influence of a fraction obtained from Galeopsis ladanum L. on the central nervous system of rodents was examined. The results of these investigations show that the fraction impeded CNS activity. It is practically nontoxic and at a dose of 2000 mg/kg i.p. it does not have a soporific influence on mice. It reduces considerably the spontaneous locomotor activity of mice as well as the locomotor activity of mice stimulated by caffeine, but did not influence the locomotor activity induced by amphetamine. The extract did not exhibit a synergetic effect with barbiturates. The results suggest that the pharmacological activity of the extract resembled the activity of drugs which generally depress the CNS, being on the border between ataractic and sedative drugs. 相似文献