418 research outputs found
Effect of steroid injection on food utilization in Channa striatus
Synthetic anabolic sex steroid hormones such as methyltestosterone (MT), testosterone (T), testosterone propionate (TP), estroid (ED), diethylstilbesterol (DES), diethylstilbesterol dipropionate (DES dipro) and docabolin (DN) were tested separately for their effect on food utilization in Channa striatus. Injection of low dosages of DES, DES dipro and TP acts as appetite depressors and Dn, MT, Ed and T as stimulators. MT, Ed and Dn induced not only increased feeding but also increased conversion. T promoted growth along with food consumption. Though DES and DES dipro suppressed feeding; individuals receiving these hormones showed increased growth with increasing dosage
Magnetic and Transport Properties of Ternary Indides of type R2CoIn8 (R = Ce, Pr and Dy)
We have synthesized and investigated the magnetic and transport properties of
a series of compounds, R2CoIn8 (R = rare earth). Compounds form in single phase
with a tetragonal structure (space group P4/mmm, no. 162). The Ce compound
shows heavy fermion behavior. The magnetic susceptibility of Pr2CoIn8 shows a
marked deviation from the Curie-Weiss behavior at low temperatures, which is
attributed to the crystalline electric field effects. Heat capacity and
magnetization measurements show that Dy2CoIn8 undergoes a magnetic transition
at 17 K and a second transition near 5 K, the latter of which may be due to
spin reorientation. Magnetization of this compound shows two metamagnetic
transitions approximately at 3.6 T and 8.3 T.Comment: Total 7 pages of text and figure
Magnetocaloric effect in R2Ti3Ge4 (R = Gd, Tb and Er) Compounds
Heat capacity of polycrystalline R2Ti3Ge4 (R = Gd, Tb and Er) compounds
(Orthorhombic, Sm5Ge4-type, Space group Pnma) has been studied in the
temperature range of 1.8 K to 300 K in various applied magnetic fields. The
compounds with magnetic lanthanide elements show interesting low field
magnetism intrigued by possible presence of competing antiferromagnetic and
ferromagnetic interactions. The magnetocaloric effect in these compounds is
estimated from the field dependent heat capacity data. The magnetic entropy
change and the adiabatic temperature change in the vicinity of the magnetic
transition are found to be significant.Comment: 12 pages incl 3 figures, submitted to Journal of Applied Physic
1-Allyl-3,3-diphenylindolin-2-one
In the title compound, C23H19NO, the oxindole residue is essentially planar and is almost perpendicular to the phenyl rings [dihedral angles = 72.1 (6) and 77.6 (6)°]. The molecular packing is stabilized by C—H⋯O hydrogen bonds and C—H⋯N interactions
1-Allyl-3,3-di-p-tolylindolin-2-one
In the title compound, C25H23NO, the indoline system is essentially planar. The molecular structure is stabilized by weak intramolecular C—H⋯N interactions and the crystal packing is determined by intermolecular C—H⋯π interactions
Fusarium oxysporum f. sp. lycopersici causal agent of vascular wilt disease of tomato: Biology to diversity– A review
Tomato (Lycopersicon esculentum) is one of the widely grown vegetables worldwide. Fusarium oxysporum f. sp. lycopersici (FOL) is the significant contributory pathogen of tomato vascular wilt. The initial symptoms of the disease appear in the lower leaves gradually, trail by wilting of the plants. It has been reported that FOL penetrates the tomato plant, colonizing and leaving the vascular tissue dark brown, and this discoloration extends to the apex, leading to the plants wilting, collapsing and dying. Therefore, it has been widely accepted that wilting caused by this fungus is the result of a combination of various physiological activities, including the accumulation of fungal mycelia in and around xylem, mycotoxin production, inactivation of host defense, and the production of tyloses; however, wilting symptoms are variable. Therefore, the selection of molecular markers may be a more effective means of screening tomato races. Several studies on the detection of FOL have been carried out and have suggested the potency of the technique for diagnosing FOL. This review focuses on biology and variability of FOL, understanding and presenting a holistic picture of the vascular wilt disease of tomato in relation to disease model, biology, virulence. We conclude that genomic and proteomic approachesare greater tools for identification of informative candidates involved in pathogenicity, which can be considered as one of the approaches in managing the disease
Electronic structure of NiSSe across the phase transition
We report very highly resolved photoemission spectra of NiS(1-x)Se(x) across
the so-called metal-insulator transition as a function of temperature as well
as composition. The present results convincingly demonstrate that the low
temperature, antiferromagnetic phase is metallic, with a reduced density of
states at E. This decrease is possibly due to the opening of gaps along
specific directions in the Brillouin zone caused by the antiferromagnetic
ordering.Comment: Revtex, 4 pages, 3 postscript figure
Synthesis and molecular docking studies of coumarin-imidazole conjugates as potential antimicrobial agents
110-125One-pot multi-component synthesis of tri and tetra-substituted coumarin-imidazole conjugates have been achieved in good to excellent yield under conventional and microwave methods in optimized catalyst condition. Further, they have been evaluated for antimicrobial activity against Gram positive Bacillus flexus and Gram negative Pseudomonas Spp. bacterial strains and two strains of fungi Scopulariopsis spp. and Aspergillus tereus organisms. The results of microbial activity are promising against tested organisms. The molecular docking study has been performed for all the compounds and docking scores are excellent. Synthesized compounds have been characterized by IR, NMR, mass and a few of them by single crystal X-ray analysis
Electronic structure investigation of GdNi using X-ray absorption, magnetic circular dichroism and hard x-ray photoemission spectroscopy
GdNi is a ferrimagnetic material with a Curie temperature Tc = 69 K which
exhibits a large magnetocaloric effect, making it useful for magnetic
refrigerator applications. We investigate the electronic structure of GdNi by
carrying out x-ray absorption spectroscopy (XAS) and x-ray magnetic circular
dichroism (XMCD) at T = 25 K in the ferrimagnetic phase. We analyze the Gd
M-edge ( - ) and Ni L-edge ( - ) spectra using
atomic multiplet and cluster model calculations, respectively. The atomic
multiplet calculation for Gd M-edge XAS indicates that Gd is trivalent
in GdNi, consistent with localized states. On the other hand, a model
cluster calculation for Ni L-edge XAS shows that Ni is effectively
divalent in GdNi and strongly hybridized with nearest neighbour Gd states,
resulting in a -electron count of 8.57. The Gd M-edge XMCD spectrum
is consistent with a ground state configuration of S = 7/2 and L=0. The Ni
L-edge XMCD results indicate that the antiferromagnetically aligned Ni
moments exhibit a small but finite magnetic moment ( 0.12
) with the ratio 0.11. Valence band hard x-ray
photoemission spectroscopy shows Ni features at the Fermi level,
confirming a partially filled band, while the Gd states are at high
binding energies away from the Fermi level. The results indicate that the Ni
band is not fully occupied and contradicts the charge-transfer model for
rare-earth based alloys. The obtained electronic parameters indicate that GdNi
is a strongly correlated charge transfer metal with the Ni on-site Coulomb
energy being much larger than the effective charge-transfer energy between the
Ni and Gd states.Comment: 9 pages, 6 figures, text and figures revise
Identification of Metals Found in the Leaves of Tabernaemontana alternifolia
Abstract: Tabernaemontana alternifolia, an Ayurvedic medicinal plant is found in the western ghats of Maharashtra. The leaves, roots, bark-stem are used in Ayurvedic system of medicines. Leaves are used in the form of churna/extract or in combination with the other plant materials in their formulations. It is administered orally. Metal analysis of the leaves of Tabernaemontana alternifolia shows a high percentage of metals like magnesium, calcium, iron, copper and manganese. The present results will prove to be useful in understanding the role of metal ions in the biogenesis of the secondary metabolites of the medicinally important plant
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