Two Parameter Modified Ratio Estimators with Two Auxiliary Variables for Estimation of Finite Population Mean with Known Skewness, Kurtosis and Correlation Coefficient

Consider the two parameter modified ratio estimators for the estimation of finite population mean using the skewness, kurtosis and correlation coefficient of two auxiliary variables. The efficiencies of the proposed modified ratio estimators are assessed with that of the simple random sampling without replacement (SRSWOR) sample mean and some of the existing ratio estimators in terms of mean squared errors. The entire above is explained with the help of certain natural populations available in the literature

Median Based Modified Ratio Estimators with Known Quartiles of an Auxiliary Variable

New median based modified ratio estimators for estimating a finite population mean using quartiles and functions of an auxiliary variable are proposed. The bias and mean squared error of the proposed estimators are obtained and the mean squared error of the proposed estimators are compared with the usual simple random sampling without replacement (SRSWOR) sample mean, ratio estimator, a few existing modified ratio estimators, the linear regression estimator and median based ratio estimator for certain natural populations. A numerical study shows that the proposed estimators perform better than existing estimators; in addition, it is shown that the proposed median based modified ratio estimators outperform the ratio and modified ratio estimators as well as the linear regression estimator

Nematicidal activity of fervenulin isolated from a nematicidal actinomycete, Streptomyces sp. CMU-MH021, on Meloidogyne incognita

An isolate of the actinomycete, Streptomyces sp. CMU-MH021 produced secondary metabolites that inhibited egg hatch and increased juvenile mortality of the root-knot nematode Meloidogyne incognita in vitro. 16S rDNA gene sequencing showed that the isolate sequence was 99% identical to Streptomyces roseoverticillatus. The culture filtrates form different culture media were tested for nematocidal activity. The maximal activity against M. incognita was obtained by using modified basal (MB) medium. The nematicidal assay-directed fractionation of the culture broth delivered fervenulin (1) and isocoumarin (2). Fervenulin, a low molecular weight compound, shows a broad range of biological activities. However, nematicidal activity of fervenulin was not previously reported. The nematicidal activity of fervenulin (1) was assessed using the broth microdilution technique. The lowest minimum inhibitory concentrations (MICs) of the compound against egg hatch of M. incognita was 30 μg/ml and juvenile mortality of M. incognita increasing was observed at 120 μg/ml. Moreover, at the concentration of 250 μg/ml fervenulin (1) showed killing effect on second-stage nematode juveniles of M. incognita up to 100% after incubation for 96 h. Isocoumarin (2), another bioactive compound produced by Streptomyces sp. CMU-MH021, showed weak nematicidal activity with M. incognita

Study of Anatomical Variations of Human Tali Based on Their Calcaneal Articular Facets

ABSTRACT Talus is the important tarsal bone which participates in the formation of talocrural, subtarsal and talocalcaneo-navicular joints. Anatomical variations of calcaneal articular facets on tali can be of help to Orthopaedic surgeons in pathologies of foot for reconstruction and rehabilitation procedures in many diseases of the foot such as Talocalcaneal arthritis, tarsal coalition, fracture neck of talus, congenital dysmorphology like flat foot, valgus deformity etc. So this study was aimed to observe the anatomical variations in tali. 200 adult human tali were studied from department of Anatomy, Mahathma Gandhi Medical College and Research Institute, Puducherry and other medical colleges in and around Puducherry. Each talus was examined for the presence of various patterns of articular facets. Later they were classified into five groups. Type I tali was found in 42 %. Type II in 30%, type III in 4% and type IV in 3% of cases. Type V had three subtypes, subtype A was present in 10%, B was in 9% and C was in 2%. In the present study, type I had highest incidence and type IV had lowest incidence

Congenital calcinosis cutis of the foot

Calcinosis cutis is a rare disease characterized by deposition of insoluble calcium salts in the skin. Subepidermal calcified nodule is a form of idiopathic calcinosis cutis that commonly affects children but rarely presents at birth. Herein we describe a healthy 10-month-old boy who had a solitary hard nodule on the left foot since birth. Surgical excision of the nodule was done and histopathology confirmed the diagnosis of subepidermal calcified nodule

Investigations on Hot-wall deposited Cadmium Sulphide buffer layer for thin film solar cell

Cadmium Sulphide (CdS) thin films were deposited on to well-cleaned soda lime glass substrates using hot wall deposition technique at room temperature. The structure of CdS thin films was found to be hexagonal with < 0 0 2 > orientation and after annealing the film crystallized to < 0 0 2 >, < 1 0 1 >, < 1 0 2 >, < 1 1 2 > directions. Raman Spectroscopy confirmed the hexagonal structure with a shift at 312 cm(1). SAED pattern from the Transmission electron microscopy also confirmed the formation of hexagonal CdS. X-ray Photoelectron Spectroscopy confirmed the formation of CdS with relevant at% of Cd and S. Field emission scanning electron microscopy images revealed smooth surface of the thin film with distinctive grains. Atomic force microscopy results showed a surface roughness of 4.47 nm. Transmission spectra of the films were studied and the transparency was found to be above 80%. The optical band gap was found to be around 2.4 eV in accordance with the reported values. The results show that device quality buffer layers can be deposited using Hot-wall deposition. (C) 2018 Elsevier B.V. All rights reserved