In the years 2005 and 2006 several declining and recently died beech trees were investigated in a large city park in Dresden. The ascomycete Hypoxylon cohaerens, who is exclusively characterized as a saprophytic fungus by literature, was identified as a conspicuous cause of the disease. The symptoms of the infection, the morphologically and physiologically characteristics of the fungus in situ and in vitro as well as the factors of predisposition are presented in the article. Since H. cohaerens attains pathological importance and can be mistaken for some other ascomycetes, the distinguishing marks to related species are described. The changed importance of the fungus is evaluated for practice. 相似文献
OBJECTIVE: To evaluate the efficacy of omeprazole paste, a commonly used antiulcer drug, on intragastric pH in clinically normal neonatal foals. ANIMALS: 6 clinically normal foals between 5 and 14 days of age. PROCEDURE: Intragastric pH was recorded in each foal by use of a disposable antimony pH electrode with internal reference. Values for intragastric pH were recorded every 4 seconds by use of an ambulatory pH monitor. There were two 24-hour recordings of intragastric pH for each foal, with 24 hours between recordings. Foals were not administered any drugs during the first recording. Foals were administered omeprazole paste (4 mg/kg, PO) 1 hour after the start of the second recording. Mean pH was calculated for each hour of each 24-hour recording session. Hourly mean values were compared between the first and second 24-hour recordings. RESULTS: Complete data were obtained from 4 of 6 foals during the first 24-hour recording and 6 of 6 foals during the second 24-hour recording. Foals had significantly higher mean hourly intragastric pH for hours 2 to 22 following omeprazole administration, compared with corresponding hourly pH values in foals during the first recording. CONCLUSION AND CLINICAL RELEVANCE: Omeprazole paste can effectively increase intragastric pH in clinically normal neonatal foals within 2 hours after oral administration of the first dose and can be administered to neonatal foals at the rate of 4 mg/kg, PO, every 24 hours. 相似文献
In this paper, Rajshahi silk fabric was modified by acetic acid, tannic acid and their mixture. After acid modification, the
silk fabric was dyed with three dyes classes namely: Reactive Orange 14, Direct Yellow 29 and Mordant Blue 9. Results revealed
that the fabric modified with acid mixture of 30 % acetic acid and 20 % tannic acid improved the colorfastness of the dyed
fabric after 7 days exposure on simulated sunlight and washing with hot soap solution. Also, the acid modification could improve
the dyed fabrics’ colorfastness properties to acids and alkalis. Optimum dyeing condition was observed at 1.5, 2.0, and 2.0
% dyes for Reactive Orange 14, Direct Yellow 29 and Mordant Blue 9 respectively. The optimum dyeing time was observed 50,
60, and 50 min; and temperature was 90, 100 and 80 °C respectively. Modification of silk fabrics with acids improves the dyeability
and colorfastness of Rajshahi silk fabrics. However, the acid modification could reduce the loss in tenacity of silk fabric
upon exposure to sunlight. 相似文献
Animal welfare and environmental protection are increasingly important. Housing systems must be found that offer animal welfare while minimizing the overall emissions of ammonia and greenhouse gases. The straw flow system is an animal friendly housing system for fattening pigs, which can be operated economically on commercial farms. Emissions from conventional slurry based pig houses have been intensively studied, but more research is needed into straw based systems. In this study, we quantified emissions of ammonia and greenhouse gases from a straw flow system with or without daily removal of slurry to an outside store. The effect of applying a solid cover during outside storage was also examined.
Emissions of NH3, N2O, CH4, and volatile organic C (VOC) from a commercial straw flow system for fattening pigs in Upper Austria were measured between June 2003 and March 2004. Emissions of CH4 during housing were 1.24 and 0.54 kg CH4 per pig place per year without and with daily manure removal, respectively. The corresponding N2O emissions amounted to 39.9 and 24.5 g N2O per pig place per year, and NH3 emissions to 2.10 and 1.90 kg NH3 per pig place per year without and with daily manure removal. Emissions of CH4, N2O and NH3, and of total greenhouse gases, from the straw flow system were lower than literature reference values for forced ventilated fully slatted floor systems. Daily removal of the manure to an outside store reduced emissions from the pig house.
Emissions during storage of pig slurry derived from a straw flow system were quantified between June 2004 and June 2005. Slurry was stored in pilot scale stores with or without a solid cover and emissions quantified by a large open dynamic chamber. The solid cover reduced NH3 and greenhouse gas emissions by 30 and 50%, respectively. During cold climatic conditions stored pig manure emitted less NH3 and greenhouse gases than when stored under warm climatic conditions. We recommend the use of separate emission factors for slurry storage in the colder and warmer periods in the national emission inventory, and the use of covers on pig slurry stores.
Overall, it is concluded that the straw flow system may combine recommendations of animal welfare and environmental protection. 相似文献
Zusammenfassung In Kulturversuchen wurden die Nährstoffansprüche vonPorphyridium cruentum bei besonderer Berücksichtigung der zum guten Gedeihen für erforderlich gehaltenen Meerwasser- oder Meersalzzugabe und die Eignung verschiedener stickstoffhaltiger Verbindungen untersucht. Aus den Ergebnissen lassen sich Hinweise zur Ökologie der Alge am natürlichen Standort ableiten.
Summary By means of culture experiments investigations were made on the nutrient requirements ofPorphyridium cruentum with special regard to its presumed demand of sea-water or sea-salt supply. Futhermore nitrogenous substances were tested relative to their value as a nitrogen source. The results of these investigations gave a hint at the ecological conditions of this alga in its natural environment.
Phorphyridium cruentum . , . .
Zugleich Veröffentlichung aus der Forschungsstelle für Limnologie, Jena, der Deutschen Akademie der Wissenschaften zu Berlin. 相似文献
Zusammenfassung Die OlpidiaceePleotrachelus wildemani Petersen (1910), bisher nur aus Dänemark und Großbritannien bekannt, wurde in Moosprotonemen erstmalig für Deutschland gefunden, mit dem Wirt kultiviert und durch Infektionsversuche auf ihr Wirtsspektrum geprüft. Drei Laubmoosarten zeigten sich anfällig, auf Lebermoose gelang eine Übertragung bisher nicht. An den Kulturen konnten der vegetative Entwicklungszyklus verfolgt und die Variationsmöglichkeiten der Zoosporangienform studiert werden.
Summary The occurrence ofPleotrachelus wildemani Petersen (1910) (Olpidiaceae) hitherto found only in Denmark and Great Britain is now reported even for Germany, in the neighbourhood of Gatersleben, parasitic in moss-protonema. The phycomycete was cultivated together with a host plant in order to trace his life history on living material with special regard to the variability of Zoosporangia. Inoculation experiments demonstrated that the fungus is capable to infect the protonema of several species of Musci. Infection of Liverworts however could not yet be detected.