Comparison of Two Methods For Determining the Discoloration Potential of Potato Tubers Based on Their Chemical and Biochemical Properties     

Efren Delgado  Jaroslaw Poberezny  Elke Pawelzik  Ilona Rogozinska 《American Journal of Potato Research》2001,78(5):389-394

The aim of this study was to compare the homogenization and visual methods that are used to determine the discoloration potential of potato tubers. Two German cultivars, Agria and Satina, and two Polish cultivars, Lena and Mors, were planted during 1998 and 1999 in Goettingen, Germany, and in Bydgoszcz, Poland. The discoloration potential of the tubers was measured after harvesting and after 6 months of storage at 4 C and 8 C. Both methods correlated significantly at harvest (0.709,P < 0.001). After storage the correlation was significant but low (r = 0.403,P < 0.001) probably because of physical changes in the tuber during storage. The visual method can be used as a fast method, especially at harvest. However, the homogenization and visual methods determine, to a certain degree, different tuber properties leading to the discoloration potential. Therefore, a complete comparison is not possible. The methods studied in this paper can complement but not substitute each other. Reliable comparisons between institutes require use of the same method to determine the discoloration potential of the tuber.  相似文献   

Airway obstruction in a dog after Dieffenbachia ingestion     

Katherine Peterson DVM  Jessica Beymer DVM  Elke Rudloff DVM  DACVECC  Mauria O'Brien DVM  DACVECC 《Journal of Veterinary Emergency and Critical Care》2009,19(6):635-639

Objective – To describe a case of Dieffenbachia ingestion in a dog presented for dysphagia and airway obstruction successfully treated with a temporary tracheostomy and supportive care beyond that reported in the veterinary literature. Case Summary – An 8‐year‐old male neutered Labrador Retriever, weighing 30 kg, was presented with the complaint of choking and gagging. Abdominal radiographs showed that he had a distended stomach full of foreign material and a gastrotomy was performed. After receiving preanesthetic medication, the dog developed inspiratory stridor and during anesthetic induction, marked oropharyngeal swelling complicated tracheal intubation. During surgery a large amount of dog bedding and Dieffenbachia plant material was removed. Because of the severity of the oropharyngeal swelling, the dog required a temporary tracheostomy and treatment for an acute allergic reaction related to the Dieffenbachia ingestion. The patient was discharged after 6 days in the hospital and had no significant complications. New or Unique Information Provided – To our knowledge, this is the first reported case of successful treatment of an airway obstruction related to the toxicity of Dieffenbachia ingestion.  相似文献   

Modifications of strawberry fruit antioxidant pools and fruit quality under NaCl stress     

Keutgen AJ  Pawelzik E 《Journal of agricultural and food chemistry》2007,55(10):4066-4072

The responses of fruit antioxidants in two strawberry cultivars differing in their sensitivity to NaCl stress were studied. The sensitive cv. Elsanta and the less sensitive cv. Korona were treated with NaCl solutions of 40 and 80 mmol/L in the nutrient solution. In general, moderate salinity resulted in increases of antioxidant capacity. In cv. Korona, salt stress increased the activity of superoxide dismutase and the contents of glutathione, phenols, and anthocyanins, while that of ascorbic acid decreased. In cv. Elsanta, changes of superoxid dismutase activity and of ascorbic acid concentration were comparable to those of cv. Korona, but the decrease of ascorbic acid was more distinct. The contents of anthocyanins decreased, and those of phenols remained similar. The glutathione content was reduced at the highest NaCl level. The results indicate that less salt-sensitive strawberry cultivars may be grown under moderate salinity stress to optimize fruit quality.  相似文献