Effects of fish and prawn culture on physico-chemical parameters of water and rice yield in rice fields

An experiment was conducted with five treatments i.e. rice combined with fish having regular urea fertilization (T1), rice combined with prawn having regular urea fertilization (T2), rice combined with fish with supplementary feeding (T3), rice combined with prawn with supplementary feeding (T4) and without fish and prawn (T5) was kept as control. The dissolved oxygen values obtained in treatments with fish both in morning and afternoon were lower than the values of prawn containing treatments and control. The values of nitrate-N, ammonia-N, phosphate-P and chlorophyll-a were higher in fish containing treatments than the prawn containing treatments and control. Between the two fish containing treatments the higher gross (539.44 kg/ha) and net (440.14 kg/ha) yield were obtained in T3 with supplementary feeding and the lower gross (424.88 kg/ha) and net (314.32 kg/ha) yield were recorded in T1 without supplementary feeding. Again, between two prawn containing treatments the higher gross (108.69 kg/ha) and net (81.92 kg/ha) yield were obtained in T4 with supplementary feeding and lower gross (64.32 kg/ha) and net (30.98 kg/ha) yield were recorded in T2 without supplementary feeding. The highest yield of rice grain (3.45 mt/ha) and straw (6.37 mt/ha) were obtained in T1 with fish having urea fertilization without feeding

Effect of Hydroxyapatite Nanoparticles on Properties of Keratin/Poly Caprolactone Nanofibers for Tissue Engineering

In this research, keratin (Kr)/ poly caprolactone (PCL)/ hydroxyapatite (HA) scaffold was made by electrospinning method. Then, the effect of HA nanoparticles on properties of scaffold B (Kr 33%, PCL 50% and HA 17%) and scaffold A (Kr 40% and PCL 60%) were studied. The surface morphology, functional groups on the surface of samples, porosity, and specific surface area were evaluated by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectrophotometer (FTIR), liquid displacement method, and BET test, respectively. The mean diameter of fibers in samples A and B was measured 184 nm and 108 nm, respectively. Results showed that the  specific surface area in scaffolds with HA nanoparticles was almost 2 times higher than that of the scaffold without HA. The biodegradability of scaffolds was examined in phosphate buffer solution (PBS) and the results showed an increase in the weight loss percentage of the scaffold B. The cell viability and adherence of osteosarcoma cell line (Saos-2) on the scaffold surface was observed via MTT assay and the results showed an increase in cell growth on PCL/Kr scaffolds with HA nanoparticles. Thus, scaffolds containing HA nanoparticles can be a good choice for tissue engineering applications

The impact of financial ratios on the prediction of bankruptcy of small and medium companies

El objetivo principal de esta investigación es examinar el impacto de los coeficientes financieros en la predicción de quiebra de pequeñas y medianas empresas. Las comunidades estadísticas de este estudio fueron las empresas aceptadas en la Bolsa de Teherán, cuya muestra estadística incluye 104 empresas de datos para un período de 7 años, 2007-2015. El muestreo se realizó a través del método de rechazo del método sistemático. El método se utilizó para estimar el modelo de regresión logística. Los resultados del estudio mostraron que un aumento en los coeficientes de liquidez reduce la posibilidad de dificultades financieras en las pequeñas y medianas empresas. También se encontró que cuando aumenta el coeficiente de rentabilidad también se reduce la posibilidad de dificultades financieras para las pequeñas y medianas empresas. Además, los resultados mostraron que al aumentar el coeficiente del poder de pago de la deuda, se reduce la posibilidad de dificultades financieras para las pequeñas y medianas empresas. Sin embargo, entre la propiedad y el valor de la relación añadida no hay relación significativa con respecto a la desventaja financiera de las pequeñas y medianas empresas

Weddell seals exibit dicontinuous variation in their underwater trills

Male Weddell seals produce loud, long underwater trills when defending breathing holes or groups of females. Mixing of males along the coastline should result in clinal variation in their trills. We examined duration, frequency and waveform measures of trills recorded around Antarctica. Features measured are present in all trills, thus facilitating multivariate analyses