Japanese medaka (Oryzias latipes) were continually exposed in a flow-through diluter system for 9 months to measured chloroform concentrations of 0.017, 0.151, or 1.463 mg/L. Parameters evaluated were hepatocarcinogenicity, hepatocellular proliferation, hematology, and intrahepatic chloroform concentration. Histopathology was evaluated at 6 and 9 months. Chloroform was not hepatocarcinogenic to...

A multiwavelength spectrophotometric (WApH) titration method for determinatio constants (pΚa values) of ionisable compounds developed previously was applied derivatives of pharmaceutical interest. Specifically, UV absorption spectra of the drug the course of a pH-metric titration using an optical device based on a fibre optics dip pr diode array detector. Target factor analysis was applied to d...

We demonstrate a new technique for saturated-absorption spectroscopy using co-propagating beams that does not have the problem of crossover resonances. The pump beam is locked to a transition and its absorption signal is monitored while the probe beam is scanned. As the probe comes into resonance with another transition, the pump absorption is reduced and the signal shows a Doppler-free dip. We...

Controlled preparation of inorganic nanostructures on substrates is very important for various applications of functional inorganic nanomaterials. Dip-pen nanolithography (DPN), as an atomic force microscopy (AFM) based technique, can directly fabricate nanostructures with precise position and morphology control on the nanometer scale and meanwhile image the produced nanostructures in situ at h...

We demonstrate a new technique for saturated-absorption spectroscopy by use of copropagating beams that does not have the problem of crossover resonances. The pump beam is locked to a transition, and its absorption signal is monitored while the probe beam is scanned. As the probe comes into resonance with another transition, the pump absorption is reduced and the signal shows a Doppler-free dip...

In the present study, the technique of principal component analysis (PCA) is applied to analyze the hourly mean values of geomagnetic field components D, H, and Z along an Indo-Russian chain of stations during the International Equatorial Electrojet Year (IEEY) from January 1992 to June 1993. This technique (PCA) is found to be suitable for separating the normal electrojet (NEJ) and counter-ele...

Chloroform, ethanolic, methanolic, ethyl acetate and aqueous root extracts of Anogeissus leiocarpus and Terminalia avicennioides were investigated in vitro for antifungal activities against Aspergillus niger, Aspergillus fumigatus, Penicillium species, Microsporum audouinii and Trichophyton rubrum using radial growth technique. The plant extracts inhibited the growth of all the test organisms. ...

The penguin wing oyster Pteria penguin whole body extract was obtained with different solvents. The whole body extracts were assayed for antibacterial activity using agar well diffusion technique against human pathogens. The extracts derived from acetone and chloroform exhibited broad antibacterial activity. Highest activity was exhibited against Klebsiella pneumoniae (6 mm) and Staphylococcus ...