http://localhost:80/xmlui/handle/123456789/13822 2026-04-12T16:09:12Z http://localhost:80/xmlui/handle/123456789/13883 Title: Essential oils from Zanthoxylum fagara Wild Lime, Ruta chalepensis L. and Thymus vulgaris L.: Composition and activity against Aedes aegypti larvae Authors: Alejandro Pérez López, Luis; de la Torre, Yael C.; Torres Cirio, Anabel; Waksman de Torres, Noemí; Elizabeth Flores Suárez, Adriana; Salazar Aranda, Ricardo Abstract: The dengue virus is transmitted by Aedes aegypti. Several plants are used to control this mosquito. In the present study the chemical composition of the essential oils of Ruta chalepensis, Zanthoxylum fagara and Thymus vulgaris were analyzed, and their activities against larvae of two A. aegypti populations were evaluated. The major compounds found in T. vulgaris were thymol and ο-cymene at 39.8% and 30.5%, respectively, with the major components being oxygenated monoterpenes and monoterpene hydrocarbons at 55.5% and 40.4%, respectively. For Z. fagara, the major compounds were sylvestrene and E-caryophyllene at 25.3% and 23.6%, respectively, with the major components being sesquiterpene and monoterpene hydrocarbons at 51.1% and 37.5%, respectively. Ketones were the predominant group of compounds found in R. chalepensis, with the major components being 2-undecanone and 2nonanona at 43.7% and 35.4%, respectively. Essential oils from T. vulgaris, Z. fagara and R. chalepensis showed activity against larvae of the A. aegypti New Orleans strain, producing median lethal concentrations (LC50) of 2.14, 27.57 and 2.69µg/mL, respectively, at 24 h. LC50 values produced against larvae of a local A. aegypti population in Nuevo Leon, México, were 25.37, 60.42 and 20.13µg/mL, respectively, at 24 h. 2015-09-19T00:00:00Z http://localhost:80/xmlui/handle/123456789/13882 Title: The antioxidant, general toxicity and insecticidal activities of Nepeta scrophularioides Rech. f. extracts in different developmental stages Authors: Gharbani, Parvin; Javazi, Hamideh Abstract: The essence of the present study is to focus on the antioxidant, general toxicity and insecticidal properties of the extracts of Nepeta scrophularioides Rech.f. during different developmental (vegetative, flowering, post-flowering) stages. The samples were subjected to screening for their possible antioxidant activities by using 2, 2-diphenyl-1picrylhydrazyl (DPPH) assay. The extractsof the flowering and the post-flowering stages showed higher antioxidant activity than those from the vegetative stage. The MeOH extracts of N. scrophularioides in different development stages were tested for cytotoxicity by brine shrimp toxicity assay. The result obtained for the bio assay was found to be significantly lethality. Among the samples, the extracts of flowering stage were found to be the most active with a LC50 value of 0.078 mg/mL. All three extracts showed significant insecticidal activity at the concentration of 20 mg/mL dose of test sample after 24 h. The extracts of vegetative and post-flowering were the most potent samples. 2015-08-18T00:00:00Z http://localhost:80/xmlui/handle/123456789/13881 Title: Isolation of flavonoids from Delonix elata and determination of its rutin content using capillary electrophoresis Authors: Mohammed Al-Taweel, Areej; Saad Abdel-Kader, Maged; Ahmed Fawzy, Ghada; Shagufta Perveen; Mohamed Maher, Hadir; Zoman Al-Zoman, Nourah; Mohamed Al-Shehri, Mona; Al-Johar, Haya; Al-Showiman, Hessa Abstract: Delonix elata (L.) Gamble (Fabaceae) is an important, traditionally used plant in Saudi Arabia. It is used to relieve rheumatic pain, flatulence and the seeds are employed as purgatives. The aim of the present study was to isolate chemical constituents of the n-butanol fraction (BF) of D. elata and to find out, by capillary electrophoresis (CE), percentage of rutin present in this BF. Three quercetin glycosides and one kaempferol rutinoside were isolated from the BF of aerial parts of D. elata; namely, Quercetin 3-O-rutinoside-7-O-glucoside (1), Quercetin 3,7-diglucoside (2), Quercetin 3-O-rutinoside (RUT) (3) and Kaempferol 3-O-rutinoside (4). Rutin, an active constituent has been reported to possess good pharmacological as well as therapeutic potentials. A sensitive and rapid procedure for quantitative determination of RUT by capillary electrophoresis was developed and its content was found to be 7.349 mg/gm, relative to n-butanol fraction and 18.373 mg%, relative to the dry powder of D. elata. The method could be recommended for approval and use in the pharmaceutical and food industries. 2015-09-17T00:00:00Z http://localhost:80/xmlui/handle/123456789/13880 Title: Model development for prediction of soil water dynamics in plant production Authors: Hu, Zhengfeng; Jin, Huixia; Zhang, Kefeng Abstract: Optimizing water use in agriculture and medicinal plants is crucially important worldwide. Soil sensorcontrolled irrigation systems are increasingly becoming available. However it is questionable whether irrigation scheduling based on soil measurements in the topsoil could make best use of water for deep-rooted crops. In this study a mechanistic model was employed to investigate water extraction by a deep-rooted cabbage crop from the soil profile throughout crop growth. The model accounts all key processes governing water dynamics in the soil-plant-atmosphere system. Results show that the subsoil provides a significant proportion of the seasonal transpiration, about a third of water transpired over the whole growing season. This suggests that soil water in the entire root zone should be taken into consideration in irrigation scheduling, and for sensor-controlled irrigation systems sensors in the subsoil are essential for detecting soil water status for deep-rooted crops. 2015-09-16T00:00:00Z