0000000000936532
AUTHOR
P. Strobel
The combined effect of CO2, ozone, and drought on the radical scavenging system of young oak trees (Quercus petraea) — A phytothron study
In order to study the combined effects of CO 2 , ozone, and drought, we simulated in a controlled environment the climatic conditions of a German oak stand with high ozone (daytime: 80 ppb, control: 20 ppb) during one vegetative period under a regime of low and high CO 2 concentration (370 vs 720 ppm) and drought (4 weeks < -800 hPa). To investigate the effects of CO 2 , ozone and drought on the radical scavenging system, we monitored the level of glutathione, ascorbate, and α-tocopherol. However, it is important that, under the regime of elevated CO 2 , the antioxidative behaviour of glutathione and ascorbate appears to be masked by their function as storage molecules for sulfur or carbon.
Diagnosis of Damage to Norway Spruce (Picea Abies) through Ethylene and Other Biochemical Criteria
Forest damage normally is characterized by loss and yellowing of leaves or needles. The results of this ocular damage diagnosis can be confirmed and stated more precisely through biochemical criteria, e.g. the plant hormone ethylene, the activity of the enzyme phosphoenolpyruvate-carboxylase (PEP-C), the content of chlorophyll and other biochemical parameters. Therefore we investigated the interrelation between visible damage and 13 biochemical parameters in six trees each from eleven permanent observed sites in the south-west of Germany. The results indicate that damaged trees can be separated clearly from undamaged trees by these biochemical criteria. Furthermore, statistical evaluation o…
Minimal manifestation status and prednisone withdrawal in the MGTX trial
ObjectiveTo examine whether sustained minimal manifestation status (MMS) with complete withdrawal of prednisone is better achieved in thymectomized patients with myasthenia gravis (MG).MethodsThis study is a post hoc analysis of data from a randomized trial of thymectomy in MG (Thymectomy Trial in Non-Thymomatous Myasthenia Gravis Patients Receiving Prednisone Therapy [MGTX]). MGTX was a multicenter, randomized, rater-blinded 3-year trial that was followed by a voluntary 2-year extension for patients with acetylcholine receptor (AChR) antibody–positive MG without thymoma. Patients were randomized 1:1 to thymectomy plus prednisone vs prednisone alone. Participants were age 18–65 years at enr…