Showing papers by "Deen Dayal Upadhyay Gorakhpur University published in 1980"

Fungitoxic activity of some essential oils.

Abstract: Of the five essential oils screened against Helminthosporium oryzae, the oils of Cymbopogon martinii (ginger grass oil), Cymbopogon oliveri, Cymbopogon sp. (rosa sofia oil) and Trachyspermum ammi (dethymolysed oil) exhibited strong fungitoxicity and showed wide range of activity. The oils were found more active than some of the prevalent synthetic fungicides and thus might be exploited as natural fungicides if successful infield trials. Besides, these oils were found toxic to various human pathogens.

Antifungal principle ofRanunculus sceleratus

Abstract: So far antibiotic substances have largely been obtained from microorganisms, most of which act as antibacterials and do not show antifungal activity. Search for antibiotics from higher plants remained neglected for a long time but during recent years a large number of plants have been found to contain antibacterial substances. Antifungal substances from higher plants are comparatively little known, but the search for them continues on an increasing scale. Several plants have been screened for their fungitoxicity (Gilliver, 1947; Basu and Bose, 1956; Abdullaeva, 1959; Petrushova and Meshechaninova, 1961; Nene and Thapliyal, 1965; Thapliyal and Nene, 1967; Dhar et al., 1968; Gupta and Banejee, 1970; Nicolls, 1970; Shekhawat and Prasad, 1971) but attempts to isolate and identify their active principle(s) are mostly wanting. The present paper records the isolation, identification, fungitoxicity, phytotoxicity and systemic activity of the antifungal active principle of Ranunculus sceleratus L. (Hindi: jaldhania; English: buttercup or water crowfoot), a widely occurring winter season herb with small, pale yellow flowers and nectaries at the base of the petals. It is also cultivated in gardens for its beautiful flowers and has been reported for its medicinal properties (Trivedi, 1965). Earlier, leaf extracts were found to possess strong fungicidal activity against several test fungi by the present authors (Misra et al., 1974; Misra, 1975; Misra and Dixit, 1976, 1977).

Electro-kinetic transport of acetone, water and their binary mixtures

Abstract: Electroosmosis of acetone, water and their binary mixtures through thorium oxide (ThO2) plug membrane has been studied and the data analysed using non-equilibrium thermodynamics. The phenomenological coefficients,L11 andL12 have been found to vary nonlinearly with composition. Excess phenomenological coefficients have therefore been evaluated and the results explained in terms of the membrane permeant and permeant-permeant interactions. The results on the measurement of electrophoretic velocity of ThO2 particles dispersed in acetone-water mixtures also lead to the conclusion that the components of the mixture interact appreciably.

Complexes of 2-amino-5(o-hydroxyphenyl)-1,3,4-thiadiazole with copper(II), nickel(II), cobalt(II), zinc(II) and iron(II)

Abstract: 2-Amino-5(o-hydroxyphenyl)-1,3,4-thiadiazole (AHPT) complexes of the type M(AHPT-H), (M = Cull, NilI, ColI, Znll and Fell) have been prepared and characterized by analytical, magnetic, spectral (electronic and i.r.), powder x-ray diffraction and t.g. techniques. Magnetic and electronic data indicate that the FeII, CoII, CuII complexes are octahedral and that the NilI complex is a mixture of square planar and octahedral geometries.

Studies on the Primary Production of Phytoplankton in Suraha Lake (Ballia, India)

Abstract: The paper describes the seasonal variation in the rate of phytoplankton primary production in Suraha Lake – a large shallow water body – in relation to certain physico-chemical parameters and the abundance and composition of the phytoplankton over a period of two years.

Electrical and electroluminescent behaviour of SnO2—copper-phthalocyanine—Ag systems

Abstract: Electrical and electroluminescent properties of SnO2—copper-phthalocyanine—Ag systems are presented. Thin films of copper phthalocyanine and Ag are deposited in a vacuum of 10−5 Torr. I–U, C–U, and electroluminescent studies are made. It is observed that the system behaves as a combination of two Schottky diodes with two different saturation currents and in the breakdown region it shows a SCL behaviour. The electroluminescent emission brigthness variation with applied voltage at constant frequency is found to follow the relation B = Bo exp (−b/V1/2) over wide range of frequencies. An attempt is also made to explain the voltage dependence of electroluminescent emission. Es werden die elektrischen und Elektrolumineszenz-Eigenschaften von SnO2—Kupfer phthalozyanin—Ag-Systemen mitgeteilt. Dunne Schichten von Kupferphtalozyanin und Silber werden in einem Vakuum von 10−5 Torr aufgebracht. I–U-, C–U- und Elektrolumineszenzuntersuchungen werden durchgefuhrt. Es wird beobachtet, das die Systeme sich wie eine Kombination von zwei Schottkydioden mit zwei verschiedenen Sattigungsstromen verhalten und im Durchbruchsbereich ein raumladungsbegrenztes Verhalten zeigen. Die Anderung der Helligkeit der Elektrolumineszenz mit der angelegten Spannung bei konstanter Frequenz folgt der Beziehung B = B0 × exp (−b/V1/2) uber einen weiten Frequenzbereich. Es wird der Versuch gemacht, die Spannungsabhangigkeit der Elektrolumineszenz-Emission zu erklaren.

Morphology of the alimentary canal of Millipede Trigoniulus lumbricinus (GERSTÄCKER) Diplopoda)

Abstract: The alimentary canal of T. lumbricinus is a straight tube consisting of fore gut, mid gut and the hind gut. The absence of crop, proventriculus (triturating structure); long mid gut are the features associated with the mode of feeding and the continuous feeding habit of the animal in the context of which the morphology of the alimentary canal is discussed.

On the estimation of higher order resistance coefficients from electroosmotic transport data

Abstract: First and second order resistance coefficients between membrane matrix and permeant for the permeation of methanol, acetone and methyl ethyl ketone through pyrex and quartz membranes have been evaluated from the experimental data on electroosmotic effects. Analysis of the data shows that-the following non-linear relationΔP =R 11 J v +R 12 I +R 122 I 2[1] exists between pressure difference,ΔP, and the fluxes and a linear relationΔΦ =R 21 J v +R 22 I [2] expresses the dependence of potential difference,ΔΦ, on the fluxes. The first order cross resistance coefficients have been found to obey theOnsager's reciprocity relation. An attempt has been made to explain the occurrence of higher order resistance coefficients in terms of electrokinetic character of the membrane, permeant interface.

Thermal analysis of lanthanide polyphosphates

Abstract: A study of thermal analysis of some lanthanide polyphosphates has been reported. The DTA curves of Ce, Pr and Sm polyphosphates were of similar nature. They exhibited a sharp exothermic peak indicating crystallization temperature (T c) around 520 °C. However, no peak indicatingT m was observed upto 800 °C. TG curves of Ce, La, Pr, Sm, Y polyphosphates indicated weight loss occurring in three stages. The integral procedural decomposition thermal analysis (ipdt) indicated that these materials had refractory nature.