Authors:Raman Preet, Raghbir Chand Gupta, and Saroj Kumar Pradhan
Among the complex mixture of biologically active compounds in Leptadenia pyrotechnica, three compounds have been used as analytical markers. A sensitive high-performance thin-layer chromatographic (HPTLC) method has been developed for the estimation. Methanolic extracts of whole plants from three populations were used on aluminum pre-coated silica gel 60 F254 plates with different mobile phases to determine the amount of β-sitosterol, lupeol, and oleanolic acid with RF value of 0.64, 0.84, and 0.47, respectively. The calibration curve was linear in the range of 2–10 μg. The method is reliable for the quantification, separation, and good resolution of these compounds from other constituents of L. pyrotechnica. To ascertain the purity of the peak from the test sample, its in-situ reflectance spectrum was compared with that from standards; the clear superimposability indicated the purity of the peaks.
: Studies on cereal root eel worm Heterodera avenae with special reference to molya disease of wheat and barley in Rajasthan. Ph D Thesis, University of Rajasthan, Jaipur, India.
Mathur, B. N., Bhatnagar, V. K., Midha, R. L
The paper shows on the example of Vājīd, a poet once popular but neglected in colonial and nationalist historiography, that rich treasures of Indian literature still await unearthing and philological work. The extraordinary popularity of Vājīd (fl. 1600) in Hindi before the advent of western modernism is shown by the high number of manuscripts containing his works and by the fact that he was considered to be the best exponent of the poetic form arilla. Hardly anything of his more than hundred and twenty works is published today and he is scarcely mentioned in modern literary histories. The paper examines early sectarian and secular sources on Vājīd’s life, compares them with Vājīd’s poetry and with early manuscript material, follows up his modern reception and presents the range of this poet’s works.
Ample evidence exists from ancient Indian texts, geomorphology and sedimentology that a mighty river that once originated in the Himalayas flowed in the North-west India during 7000-3000 BP and disappeared in the sands of the Rajasthan desert. Remote sensing combined with ground search identified part of the buried channel of the ancient river in the Jaisalmer region of Rajasthan. Isotope study showed that the fresh groundwater in that region was indeed ancient and slowly moving southwest and probably had headwater connection in the lower ranges of Himalayas, but not to any glacier. The isotope data (2H, 18O, 3H and 14C) compare well with the data in a similar study on another branch of the buried channel in the Cholistan part of the Thar Desert in Pakistan.
Authors:R. Reddy, P. Reddy, G. Reddy, and B. Rangamannar
A rapid radiochemical method for the determination of thallium(III) has been developed based on the substoichiometric extraction of its 13 complex with sodium isopropyl xanthate into chloroform from pH 9 ammonia buffer. The effect of foreign ions on the extraction was also studied. 10 g amounts of thallium were determined with an average error of 1.9%. The method has been successfully applied for the determination of thallium content present in sphalarite ores collected from Jawar Mines, Rajasthan (India).
The possible determination of tungsten in low grade ores from Northern India, Rajasthan State has been explored by energy dispersive X-ray fluorescence analysis /EDXRF/ technique using radioisotope based excitation of W L X-rays and high resolution Si/Li/ detector system. Finely powdered ore has been diluted with optimal quantity of cellulose and converted into pellets to make it suitable for X-ray analysis after homogenization. The experiments have shown the minimum detectable limit of 33 ppm in diluted matrix. The results are compared with the spectrophotometric stannous chloride-thiocyanate method. EDXRF appears to be encouraging for routine and precise analysis of tungsten in low grade ores.
The sensitive and simple fission track detection technique using a dry method with Melinex-0 plastic track detector has been applied for the determination of uranium concentration in samples of domestic water supply plants collected from different states of India, namely West Bengal, Uttar Pradesh, Rajasthan, Punjab and Delhi. Our analyses show that uranium concentration of water samples collected from different types of domestic water supply plants vary from 0.6±0.02 to 19.2±0.6 g/l. The present investigations may be useful from the point of view of radiation hygiene.
Authors:A. Singh, A. Kumar, P. Jojo, and Rajendra Prasad
Uranium content of soil samples collected from different states of India, namely Uttar Prades, Rajasthan and Kerala has been
estimated. The areas cover the normal background area, high background area and dumpyards of fertilizer factory and thermal
power plant. Plastic sheets were used as a detector for the registration of fission tracks resulting from the (n, f) reaction
on235U present in the sample due to the thermal neutrons from a nuclear reactor. The uranium concentration has been found to vary
from 0.24 to 9.20 μg/g in various soil samples. Higher levels of uranium were found in the vicinity of a coal fired power
plant. The present results may be useful for the radiation hygiene.
Population biology data collected during 1995–2009 from more than a dozen localities in Central India have revealed that both the interspecific as well as intraspecific chromosome variations are inherent in many species of Ophioglossum L. The lowest count of chromosome recorded for any plant of Ophioglossum eliminatum Khandelwal et Goswami reported to be n = 30 chromosomes has not been confirmed even in a single spore mother cell or in any mitotically dividing root tip cell. This is emphatically emphasised to be characterised by n = 86±2 chromosomes little lower than originally suggested 90±2 chromosomes. Therefore this is reemphasised that lowest chromosome count for the genus is n = 86, not n = 30 as claimed earlier. Somatic chromosomes from root tip squashes and microtome sections of root tip cells stained with haematoxylin clearly reveal polysomaty (chromosome variations in multiples within the same tissue) in O. eliminatum and O. costatum, which have been probably ignored by earlier workers. Additionally, typical epidermal feature of linear splitting of cells to form several openings in the mesophyll, inherent and expressed only by leaves of O. eliminatum has been found to be a diagnostic trait of the species collected from original localities in Shivpuri forest in Central India and far away in Rajasthan in Western India. As far as known, no living or a fossil leaf has ever shown such natural tearing of the mesophyll tissue.