Beiträge zur Konferenz des Marxistischen Forums Sachsen am 4. März 2000 in Leipzig
In: Marxistisches Forum 28/29
1442 Ergebnisse
Sortierung:
In: Marxistisches Forum 28/29
In: Abfallwirtschaft in Forschung und Praxis 62
In: Speyerer Forschungsberichte 52
In: Ecotoxicology and environmental safety: EES ; official journal of the International Society of Ecotoxicology and Environmental safety, Band 275, S. 116285
ISSN: 1090-2414
In: Environmental science and pollution research: ESPR, Band 31, Heft 14, S. 22158-22170
ISSN: 1614-7499
In: International food research journal: IFRJ, Band 29, Heft 6, S. 1450-1457
ISSN: 2231-7546
Delaying rice starch (RS) retrogradation can improve the quality parameters of rice-based starchy foods during storage. Modification of insoluble dietary fibre has always been used in the starchy food industry. Compared with vegetal insoluble dietary fibre, bacterial cellulose (BC) has many advantages such as high purity, smaller particle size, and elevated water absorption capacity. In the present work, BC was modified by high-pressure homogenisation (MBC) with different pressure levels (0, 50, 80, 120, and 160 MPa) to investigate the effect of MBC on RS retrogradation. Results showed that high-pressure homogenisation could decrease the particle size of BC. MBC addition to RS decreased paste breakdown and setback, thus suggesting that MBC might be a good candidate for increasing the stability of RS paste, and inhibiting its short-term retrogradation. The thermal properties and X-ray diffraction patterns of RS indicated that supplementing MBC could decrease the gelatinised enthalpy and relative crystallinity of RS paste during storage. Results also indicated that MBC could provide an opportunity to restrain RS retrogradation, and might be suitable for designing fibre-enriched products.
In: Ecotoxicology and environmental safety: EES ; official journal of the International Society of Ecotoxicology and Environmental safety, Band 247, S. 114255
ISSN: 1090-2414
In: Human factors: the journal of the Human Factors Society, Band 66, Heft 4, S. 1132-1151
ISSN: 1547-8181
Objective This study used electroencephalography to explore the behavioral and electrophysiological effects of task interruption on performance. Background Task interruption is known to harm work performance, especially on working memory-related tasks. However, most studies pay little attention to cognitive processes by exploring brain activity and ignore the cumulative effect of sequential interruptions. Method Thirty-four healthy participants performed a spatial 2-back in three conditions: (1) interruptions with simple math questions, (2) suspensions with prolonged fixation cross, and (3) a pure 2-back. The measured outcomes comprise performance data, ERP amplitudes, EEG power, and subjective workload. Results Work performance decreased in the resumption trials, and cumulative interruptions had a more destructive effect on performance. EEG results showed that the P2 and P3 amplitudes induced by the 2-back task significantly increased after interruptions; theta and alpha power increased after interruptions. The P3 amplitude and alpha power induced by interruptions were significantly higher than that induced by suspensions. Conclusion Behavioral data revealed the disruptive effect of interruptions on postinterruption performance and the cumulative effect of interruptions on accuracy. Changes in ERP amplitudes and EEG power indicate the mechanisms of attention reallocation and working memory during interruptions. Larger P3 amplitudes and alpha power after interruptions than after suspensions suggested the inhibition of irrelevant information. These results may support the memory for goals model and improve the understanding of the effects of interruption on working memory. Application Focusing upon the mechanisms at play during the interruption process can support interruption management to ensure work safety and efficiency.
In: Environmental science and pollution research: ESPR, Band 30, Heft 4, S. 9496-9513
ISSN: 1614-7499
In: Environmental science and pollution research: ESPR, Band 29, Heft 52, S. 78698-78710
ISSN: 1614-7499
AbstractIndoor environments may impact human health due to chemical pollutants in the indoor air and house dust. This study aimed at comparing the bioavailability and distribution of PFOA following both an inhalation and an oral exposure to PFOA coated house dust in rats. In addition, extractable organofluorine (EOF) was measured in different tissue samples to assess any potential influence of other organofluorine compounds in the experimental house dust. Blood samples were collected at sequential time points after exposure and at the time of termination; the lungs, liver, and kidney were collected for quantification of PFOA and EOF. The concentration of PFOA in plasma increased rapidly in both exposure groups attaining a Cmax at 3 h post exposure. The Cmax following inhalation was four times higher compared to oral exposures. At 48 h post exposure, the levels of PFOA in the plasma, liver, and kidney were twice as high from inhalation exposures. This shows that PFOA is readily bioavailable and has a rapid systemic distribution following an inhalation or oral exposure to house dust coated with PFOA. The proportion of PFOA to EOF corresponded to 65–71% and 74–87% in plasma and tissues, respectively. The mass balance between EOF and target PFOA indicates that there might be other unknown PFAS precursor and/or fluorinated compounds that co-existed in the house dust sample that can have accumulated in rats.
In: Waste management: international journal of integrated waste management, science and technology, Band 144, S. 490-501
ISSN: 1879-2456
In: Environmental science and pollution research: ESPR, Band 29, Heft 33, S. 50408-50426
ISSN: 1614-7499
In: Ecotoxicology and environmental safety: EES ; official journal of the International Society of Ecotoxicology and Environmental safety, Band 231, S. 113190
ISSN: 1090-2414
In: Environmental science and pollution research: ESPR, Band 29, Heft 22, S. 33095-33105
ISSN: 1614-7499