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Complexing Behaviour and Antifungal Activity of N-[(1E)-1-(1H-Benzimidazol-2-yl)ethylidene]morpholine-4-carbothiohydrazide and Related Ligand with Metal Ions
Madhu Bala,L. K. Mishra
International Journal of Inorganic Chemistry , 2014, DOI: 10.1155/2014/902575
Abstract: The coordination complexes of bivalent metal ions with N-[(1E)-1-(1H-Benzimidazol-2-yl)ethylidene]morpholine-4-carbothiohydrazide (H2bmctz, H2L-1) and N-[(1E)-1-(1H-Benzimidazol-2-yl)(phenyl)methylidene] morpholine-4-carbothiohydrazide (H2bpmctz, H2L-2) were prepared and their neutral, monoanionic, and dianionic forms of ligands of compositions [M(H2L)X2] (M= , , , , , or , X=Cl？ or Br？, and H2L=H2L-1 or H2L-2), [M(HL)2]nH2O where (M= , , , , or , H2L=H2L-1 or H2L-2, and n = 0 or 2), and [MLB]nB (M= , , , , or , B=H2O, Py, or -pic, n = 0 and n = 1 if B=H2O for Ni(II) and H2L=H2L-1 or H2L-2) have been characterised by magnetic susceptibility measurements, electrical conductance values, and spectral properties. The magnetic moment value of [M(HL2)] (M= , , or ) type complexes is consistent with high spin octahedral structure while those of [M(H2L)X2] (M= , , , , or , X=Cl？ or Br？) possess five coordinated trigonal bipyramidal geometry. The adduct complexes [MLB]·nB (M= , or , B=H2O, Py, or -pic) are four coordinated planar and those of and complexes [MLB], (H2L=H2L-1 or H2L-2, B=H2O, Py or -pic) are tetrahedral. These ligands have been suggested to coordinate as tridentate (N N S) donor molecule in complexes of type [M(H2L)X2], [M(HL)2], and [MLB]. The antifungal activity of ligands and some of their metal complexes were studied and it was observed that metal complexes show higher activity than free ligand. 1. Introduction Preparation and structural aspects of various metal ions with a number of benzimidazole derivatives have been reported by one of us and a number of chemists [1–10]. Medicinal properties of benzimidazole derivatives have established that benzimidazoles have privileged substructures for drug design [11, 12]. The most vital benzimidazole derivatives is N-ribosyl-5,6-dimethylbenzimidazole which is axial ligand in vitamin B12 possessing selective neuropeptide YY1 receptor antagonists [13], 5-lipo xyginase inhibitor [14] and poly (ADP-ribose) polymerase inhibitors [14]. Benzimidazole derivatives are of immense interest because of their wide spectrum of biological activity such as anticancer [15], antiviral [16, 17], antihistaminic [18], antifungal [19], anti-HBV [20], antibacterial [21], antitumoral [22], antiparasitic [22], antihelminitic [23], anti-inflammatory, local analgesic, hypotensive [24], antiulcer [25], and neuro leptic cardiotonic [26]. Extensive biochemical and pharmacological studies have confirmed that various benzimidazole derivatives are effective against various strains of microorganisms [25]. The wide ranging biological and
Effect of heat source on MHD free convection flow past an oscillating porous plate in the slip flow regime
S. S. Das, L. K. Mishra, P. K. Mishra
International Journal of Energy and Environment , 2011,
Abstract: This paper investigates the effect of heat source on free convective flow of a viscous incompressible electrically conducting fluid through a porous medium bounded by an oscillating porous plate in the slip flow regime in presence of a transverse magnetic field. The governing equations of the flow field are solved analytically and the expressions for velocity, temperature, skin friction t and the heat flux in terms of Nusselts number Nu are obtained. The effects of the important flow parameters such as magnetic parameter M, permeability parameter Kp, Grashof number for heat transfer Gr, heat source parameter S and rarefaction parameter R on the velocity of the flow field are analyzed quantitatively with the help of figures.
Assessment of Diversity in the Genus Ficus L. (Moraceae) of Katerniaghat Wildlife Sanctuary, Uttar Pradesh, India  [PDF]
Anoop Kumar, Omesh Bajpai, Ashish K. Mishra, Nayan Sahu, Soumit K. Behera, L. B. Chaudhary
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.21011
Abstract: The paper deals with the taxonomy and diversity within the genus Ficus occurring in Katerniaghat Wildlife Sanctuary based on extensive field and herbarium studies. The genus comprises 11 species in the study area contrary to the earlier report of 8 species. Out of which, one species each belongs to herbs (F. assamica) and straggling shrubs (F. hetero- phylla) and the remaining species to shrub to big free standing trees (F. benghalensis, F. hispida, F. palmata subsp. virgata, F. racemosa, F. religiosa, F. retusa var. nitida, F. rumphii, F. semicordata and F. squamosa). F. microcarpa and F. carica have been excluded as they do not occur in the sanctuary but reported in the previous work due to mis- identification. F. repens has been segregated from F. heterophylla and reinstated as a distinct species with a correct name F. assamica. F. retusa var. nitida forms a new record for the sanctuary. In overall gross morphology, F. hispida, F. palmata subsp. virgata, F. assamica and F. heterophylla exhibit maximum diversity especially in their leaves, pe- duncles and figs. Among all species F. hispida has been found more common especially in low land and moist areas in mixed forest whereas F. retusa var. nitida has been seen with only two plants. All species have been critically examined and provided with correct nomenclature, vernacular name, description, phenology, ecology, uses and reference to voucher specimens. A dichotomous bracketed key to the species along with line drawings has also been included for identification.
An Overview of the Control System for Dose Delivery at the UCSF Dedicated Ocular Proton Beam  [PDF]
Inder K. Daftari, Kavita K. Mishra, Rajinder P. Singh, Dan J. Shadoan, Theodore L. Phillips
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2016, DOI: 10.4236/ijmpcero.2016.54025
Abstract: Since 1978, the University of California San Francisco (UCSF) Ocular Tumor Program has been using particle therapy for treating ocular patients with malignant as well as benign eye disease. Helium ion beams were used initially and were produced by two synchrotron-based systems: first by the 184-inch synchro-cyclotron and later by the Bevalac, at the Lawrence Berkeley National Laboratory (LBNL). Since 1994, protons, produced by a cyclotron-based system at the Crocker Nuclear Laboratory (CNL) Eye Treatment Facility (ETF), have been used for this purpose. The CNL cyclotron produces a 67.5 MeV beam, allowing for a uniquely homogeneous beam for eye treatment, without degradation of the beam or manipulation of the beam line. This paper describes, in detail, the control system for beam delivery, as implemented for measuring and delivering the radiation to ocular tumors at CNL. The control system allows for optimal delivery and rapid termination of the irradiation after the desired dose is achieved. In addition, several safeguard systems are discussed, as these are essential for such a system in the event of failure of software, electronics, or other hardware. The QA analysis shows that the total range of the proton beam is 30.7 ± 1.0 mm in water at iso-center. The beam distal penumbra (80% - 20%) is 1.1 mm for a range-modulated beam at a collimator to iso-center distance of 50 mm. Daily QA checks confirm that the range and modulation is within 0.1 mm. The beam flatness and symmetry in a 25 mm diameter beam are ±1% - 2%. Variation in the daily dosimetry system, as compared to standard dosimetry, is within ±3.5%, with a mean variation of 0.72(±1.9)% and 0.85(±2.3)% for segmented transmission ionization chambers IC1 (upstream) and IC2 (downstream), respectively. From May 1994 to the end of 2015, UCSF has treated 1838 proton ocular patients at the Davis ETF. During this period, no treatments were missed due to any cyclotron or control system failures. The overall performance, maintenance, and quality assurance of the cyclotron and the ocular control system have been excellent.
On the strong matrix summability of derived Fourier series
K. N. Mishra,R. S. L. Srivastava
International Journal of Mathematics and Mathematical Sciences , 1985, DOI: 10.1155/s0161171285000382
Abstract: Strong summability with respect to a triangular matrix has been defined and applied to derived Fourier series yielding a result which extends some known results under a general criterion
Unconfined Aquifer Flow Theory - from Dupuit to present
Phoolendra K. Mishra,Kristopher L. Kuhlman
Physics , 2013, DOI: 10.1007/978-1-4614-6479-2_9
Abstract: Analytic and semi-analytic solution are often used by researchers and practicioners to estimate aquifer parameters from unconfined aquifer pumping tests. The non-linearities associated with unconfined (i.e., water table) aquifer tests makes their analysis more complex than confined tests. Although analytical solutions for unconfined flow began in the mid-1800s with Dupuit, Thiem was possibly the first to use them to estimate aquifer parameters from pumping tests in the early 1900s. In the 1950s, Boulton developed the first transient well test solution specialized to unconfined flow. By the 1970s Neuman had developed solutions considering both primary transient storage mechanisms (confined storage and delayed yield) without non-physical fitting parameters. In the last decade, research into developing unconfined aquifer test solutions has mostly focused on explicitly coupling the aquifer with the linearized vadose zone. Despite the many advanced solution methods available, there still exists a need for realism to accurately simulate real-world aquifer tests.
A new look at the highTc superconductors using BCS-theory
D N Tripathy,L K Mishra
- , 1991,
Abstract:
On approximation of conjugate of signals (functions) belonging to the generalized weighted W(L_r,xi(t)),(r geq 1)- class by product summability means of conjugate series of Fourier series
V. Narayan Mishra,H. H. Khan,K. Khatri,L. Narayan Mishra
International Journal of Mathematical Analysis , 2012,
Abstract:
Functional role of cationic surfactant to control the nano size of silica powder
L. P. Singh,S. K. Bhattacharyya,G. Mishra,S. Ahalawat
Applied Nanoscience , 2011, DOI: 10.1007/s13204-011-0016-1
Abstract: Preparation of dispersed, amorphous, spherical silica nanoparticles using cationic surfactant as organic template, tetraethoxysilane (TEOS) as silica precursor and ammonia as catalyst has been carried out using sol gel process. The aim of the present study was to evaluate the simultaneous effects of cationic surfactant on the textural and structural properties of silica nanoparticles. We used a series of the cationic surfactants, dodecytrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB) and cetyltrimethylammonium bromide (CTAB) to evaluate the effects of the chain length of cationic surfactant on the grain size of silica nanoparticles. The size of silica nanoparticles can be finely tuned in the range ~50–100 nm by changing the chain length of cationic surfactant. Decreasing the particle size of silica nano particles resulted in increase in chain length of cationic surfactant. Further, these silica nanoparticles are incorporated with cement paste to evaluate the beneficial effect on mechanical properties of cement. Synthesized silica nanoparticles were analyzed using scanning electron microscopy (SEM), 29Si MAS NMR, powder X-ray diffraction techniques (XRD) and IR studies.
Erratum to: Functional role of cationic surfactant to control the nano size of silica powder
L. P. Singh,S. K. Bhattacharyya,G. Mishra,S. Ahalawat
Applied Nanoscience , 2011, DOI: 10.1007/s13204-011-0019-y
Abstract:
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