首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   9篇
  轻工业   9篇
  2012年   1篇
  2007年   2篇
  2005年   1篇
  2004年   1篇
  2000年   1篇
  1999年   1篇
  1978年   1篇
  1972年   1篇
排序方式: 共有9条查询结果,搜索用时 109 毫秒
1
1.
Summary A new medium for the detection ofE. coli in milk and milk products has been developed. The medium contains tryptophan, lactose, and bile salts, and is based on the ability ofE. coli to produce gas from lactose and indol from tryptophan. 142E. coli test strains and 47 ice-cream samples were examined. The medium proved to be efficient in detecting theE. coli.
Zusammenfassung Ein neues Medium für den Nachweis vonE. coli in Milch und Milch produkten ist entwickelt worden. Das Medium enthält Tryptophan, Lactose und Gallensalz und basiert auf der Fähigkeit vonE. coli, Gas aus Lactose und Indol aus Tryptophan zu produzieren. 142E. coli-Versuchsstämme und 47 Eisproben wurden geprüft. Das Medium erwies sich wirksam beim Nachweis vonE. coli.


Stipendiat der Alexander von Humboldt-Stiftung.  相似文献
2.
Our objective was to identify factors associated with current cigarette smoking among Latino adults in Oregon. We used data from 1,356 Latino participants and, for comparison, 18,593 non-Latino White participants in the 2000-2002 Oregon Behavioral Risk Factor Surveillance System (BRFSS). The BRFSS is a random-digit-dialed, cross-sectional survey of noninstitutionalized, English- or Spanish-speaking adults who live in Oregon households with a telephone. We examined relationships between current smoking and gender, age, education, and survey language (a measure of acculturation) among Latinos and used the .05 level of significance. The prevalence of current smoking was significantly lower among Latinos (18.1%) than non-Latino Whites (20.8%). Latino men were significantly more likely than Latina women to be smokers (23.1% vs. 11.4%), and some evidence indicated that less education was associated with smoking among Latino men. Taking the survey in English was strongly and significantly associated with smoking among Latina women: Smoking prevalence was 20.5% among those taking the survey in English and 3.3% for those taking it in Spanish. Our results suggest that the lower smoking prevalence among Latinos was driven by Latina women taking the survey in Spanish. Hence, it is essential for tobacco control programs to examine their local Latino smoking prevalence by gender and acculturation to avoid incorrectly concluding that Latinos are at decreased risk. Although programs for Latinos should reinforce protective aspects of Latino culture, decreasing the smoking prevalence in the U.S. mainstream culture might mitigate the negative impact of acculturation on smoking behaviors.  相似文献
3.
The present study examined whether lifetime psychopathology, regular smoking and psychopathology in family members, and smoking characteristics were associated with successful cessation among daily smokers. A sample of 941 young adults was interviewed for lifetime psychopathology and smoking at three time points; biological parents and siblings were interviewed once for lifetime psychopathology and regular smoking. Within the subset of 242 daily smokers with complete data, most (83%) had tried to quit at least once, although only 22% met our definition of successful cessation (no smoking during the 12 months prior to turning age 25 years). Successful cessation was positively associated with being married and having a higher household income in young adulthood, and negatively associated with lifetime major depressive disorder, elevated antisocial personality disorder symptoms, a family history of drug and alcohol use disorder, and nicotine dependence (for women but not men). Marital status, nicotine dependence (for women but not men), and male gender were significant in multivariate analyses; the effect for major depressive disorder approached significance (p=.052). None of the measures of familial smoking were associated with successful smoking cessation. In conclusion, whereas almost all Axis I disorders in our two previous papers were associated with smoking initiation and progression to daily smoking, major depressive disorder and antisocial personality disorder symptoms were the only psychiatric conditions negatively associated with successful cessation. The causal nature of the significant associations and the degree to which modification of these factors increases the probability of future smoking cessation deserve further attention.  相似文献
4.
5.
By complementation screening of a cadmium-sensitive Schizosaccharomyces pombe mutant deficient in phytochelatin synthesis, but with 44% of the wild-type glutathione content, we cloned a DNA fragment involved in phytochelatin synthesis. Sequence analysis revealed that it encodes the second enzyme involved in glutathione (GSH) biosynthesis, glutathione synthetase (GSH2) (E.C.6.3.2.3, Wang and Oliver, 1997). The mutant allele shows a single base-pair exchange at the 3' end of the reading frame leading to a single amino acid change from glycine to aspartate. This mutation leads to a significant reduction of phytochelatin synthesis, whereas glutathione synthesis is impaired to a far lesser extent. Complementation with the Arabidopsis thaliana GSH2 cDNA led to a partial restoration of phytochelatin synthesis. These data strongly suggest that the GSH2 gene encodes a bifunctional enzyme that is able to catalyse both the synthesis of GSH by adding glycine to the dipeptide (gammaGlu-Cys) and the synthesis of phytochelatins. The sequence has been submitted to EMBL, Accession No. Y08414.  相似文献
6.
Effects of feeding an oil seed supplement treated with formalin upon lipid patterns of blood and synthesis of milk fat were evaluated. Percentages and yields of fatty acids of milk fat with chain lengths between 6 and 16 carbons were decreased while percentages and yields of stearate and linoleate were increased when the lipid supplement was fed. Calculations in cows fed control and supplement, 60% and 80%, respectively, of fatty acids of milk were derived from lipids of blood were supported by arterial-venous differences. Comparisons of the fatty acid compositions of triacylglycerol of plasma and milk fat suggested that triacylglycerol may not be the sole source of linoleate transferred from blood to milk fat. A preliminary evaluation of supplement effects upon lipoprotein patterns of serum indicated two peaks in the low density lipoprotein class and that the increase in total cholesterol of blood caused by feeding lipid supplement is due to increases in cholesterol content of the low density and high density lipoprotein classes.  相似文献
7.
8.
9.
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号