Effect of different planting locations in Egypt on volatile oil of geranium (Pelargonium graveolens L.) plant

This work was carried out during the two successive seasons (2012/2013 and 2013/2014) to investigate the effect of different planting locations on quantity and quality of Pelargnium graveolens L. volatile oil. The experiment was conducted at five different locations in Egypt in newly reclaimed lands as follows: North Sinai Governorate (El-Qantara Sharq),            El-Monofia Governorate (El-Sadat City), Matrouh Governorate (Siwa Oasis - Khamisa Village), Beni-Suef Governorate (West of Semsta Center) and Giza Governorate (El-Bahariya Oasis - Mandisha Village). Results indicated that all studied parameters such as essential oil percentage, essential oil yield per feddan, essential oil chemical composition and essential oil quality factors (citronellol content, geraniol content and citronellol : geraniol ratio) were affected and varied according to planting location and harvesting time. The best locations for production of geranium oil were El-Qantara Sharq followed by  El-Sadat City and then Beni-Suef Governorate locations.  &nbsp

Antioxidant defense system participation in cross-adaptation of Ocimum basilicum to complex action of UV-B and salinity

The 10 min UV-B irradiation (12 dj/m2) and 100mM NaCl action on medical plants Ocimum basilicum L., grown in water culture, was studying. The plants treated by UV-B irradiation were more resistent to salinity. There were two groups of compounds. One - proline, carotinoids, phenols are accumulated under salinity conditions. Second group - pigments - antocyans and flavones. Its biosynthesis is stimulated by UV-B irradiation. Under complex stressor action pigments were increased and this increasing helped plants to overcome the high salinity. The antioxidant enzyme superoxid dismutase did not play essential role in adaptive response. The low molecular weight antioxidants were more effective for formation of adaptation response. The peroxidase activity had not correlation with superoxid dismutase activity and we supposed that H2O2 could be result of other process and served as signal molecul

Evaluation of antioxidatant potential in medical plants under UV-B-irradiation

The UV-B irradiation action (6 -36,9 dg/m2) on medical plants Artemisia lerchiana L., Nigella sativa L., Ocimum basilicum L., grown in water culture, was studying. In plant leaves and roots the content of malondialdehyde, pigments, phenols, flavonoids, proline, and activities of antioxidant enzymes were determined. Investigated plants were able to resist to action of UV-B-irradiation (low and middle dose) without any power input for increasing of biosynthesis of low and high molecular component of antioxidant defense system. The damage level under stress conditions was low. At first hours plants used the constitutive level of antioxidants and after 24 h it was needed the antioxidant pool refilling. Carotinoids, flavonoids and proline were used by plants in 4 h after irradiation, the antocian synthesis increased after 12 h

Electrophilic C12 Building Blocks for Alkaloids: Formal Total Synthesis of (±)-Maritidine

Silyl-protected benzyl alcohol derivatives and the salt 1 are used to form ortho-substituted C-12 electrophilic organoiron building blocks which are converted into a spirocyclic cyclohexenone to complete a formal total synthesis of (+/-)-maritidine (5). The choice of TBDPS protection was shown to be better than TIPS and compatible with ipso nucleophile addition to form a quaternary center. The reaction sequence is the first example of a successful application in the synthesis of an arylcyclohexadienyliron complex with an ortho-carbon substituent in the position required for Amaryllidaceae alkaloids of this type