Deen Dayal Upadhyay Gorakhpur University

About: Deen Dayal Upadhyay Gorakhpur University is a education organization based out in Gorakhpur, Uttar Pradesh, India. It is known for research contribution in the topics: Thermal decomposition & Lymnaea acuminata. The organization has 1032 authors who have published 1591 publications receiving 21734 citations. The organization is also known as: Gorakhpur University.

Studies on essential oils, Part 33: chemical and insecticidal investigations on leaf oil of Coleus amboinicus Lour.

Abstract: Chemical investigations of the leaf essential oil of Coleus amboinicus by GC and GC-MS tech- niques indicated the presence of six components, accounting for 97% of the total oil. The major component was thymol (94.3%), followed by carvacrol (1.2%), 1,8-cineole (0.8%), p-cymene (0.3%), spathulenol (0.2%), terpinen-4-ol (0.2%) and an unidentified component (1.4%). The oil was insecticidal to white termites (Odon- totermes obesus Rhamb.) with 100% mortality at a dose of 2.5 ð 10 � 2 mg/cm 3 for 5 h exposure. This oil was also more active than the synthetic insecticides, Thiodan and Primoban-20, against termites, although it was ineffective against Tribolium castaneum, a stored product pest. Copyright  2002 John Wiley & Sons, Ltd.

Pharmacological effects of Sapindus mukorossi.

Abstract: Sapindus mukorossi is an extremely valuable medicinal plant, distributed in tropical and sub-tropical regions of Asia. The aim of present review is to form a short compilation of the phytochemical composition and pharmacological properties of this multipurpose tree. The main phytoconstituents isolated and identified from different parts of this plant are triterpenoidal saponins of oleanane, dammarane and tirucullane type. The structure and chemical names of all the types of triterpenoidal saponins reported in Sapindus mukorossi are included in this review. Many research studies have been conducted to prove the plant's potential as being spermicidal, contraceptive, hepatoprotective, emetic, anti-inflammatory and anti-protozoal. The present review highlights some of the salient pharmacological uses of Sapindus mukorossi.

Impedance spectroscopy study of an organic semiconductor: Alizarin

Abstract: The electrical properties of alizarin, a π-conjugated organic semiconductor, were investigated by the complex impedance spectroscopy technique. A transition from semiconducting to conducting state has been observed and the transition temperature shifts to higher side with the increment in frequency. The dielectric relaxation was found to be of non-Debye type (polydispersive). Evidences of temperature-dependent electrical relaxation phenomena as well as negative temperature coefficient of resistance (NTCR) character of the sample have also been observed. The AC conductivity obeys the power law and the dispersion in conductivity was observed in the lower frequency region. Also, the frequency-dependent AC conductivity at different temperatures indicated that the conduction process is thermally activated process. The activation energy, density of states at Fermi level and number of π-electrons per molecule has been estimated from AC conductivity–temperature data and was found, respectively, to be 0.78 eV, 1.2×1019 cm−3 eV−1 and 25. Modulus analysis has indicated the possibility of hopping mechanism for electrical transport processes in the system with non-exponential-type conductivity relaxation.