We report bacterial growth under hypergravitational stress. Cultures of E. coli and B. subtilis were subjected to the gravitational stress (38g) and their growth curves were measured using UV-VIS spectrophotometer. Experiments were also carried out to investigate nutrient consumption under hypergravitational conditions. Our results show considerable difference between samples subjected to hyper...

The most widely used and accepted method for hemoglobin determination is the cyanmethemoglobin method. However, laboratory spectrophotometers used with this procedure are not amenable to field use. We describe the design of a portable hemoglobinometer for use with the cyanmethemoglobin method. Solid-state light sources and detectors are used, and a simple meter readout of hemoglobin is produced...

An AutoAnalyzer method has been developed in which the recently introduced reagent for iron, 3. (2.pyridyl).5,6.bis(4.phenylsulfonic acid).1,2,4.triazine (“ferrozine”), is used. With the Technicon colorimeter or Gilford 300-N spectrophotometer in use, sampling rates may be 30/h or 50/h, respectively. Sample volume is 0.8 ml, and measurements are made at 560 nm. A procedure for measuring total i...

The Potentiophotometer is a new instrument for measuring the absorption characteristics of solutions. A brief description of its construction and theory of operation is presented, with illustrations of its use in the colorimetric quantitative analysis for inorganic phosphorus and total protein in serum. The potentiophotometric results correlate well (r = 0.97 to 0.98) with measurements made of ...

OBJECTIVES To review current knowledge on the definition of tooth whiteness and its application within dentistry, together with the measured range of tooth colours. METHODS 'Medline' and 'ISI Web of Sciences' databases were searched electronically with key words tooth, teeth, colour, colour, white and whiteness. CONCLUSIONS The application of colour science within dentistry has permitted th...

Current Address: L. Marty Martinez, Spartanburg Regional Medical Center, 101 E. Wood Street, Spartanburg, South Carolina 29303, phone (803) 853-0864 To whom correspondence should be addressed: D. Wesley Corson, Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, South Carolina, Phone (803) 792-7673, Fax: (803) 792-1723 email: [email protected] L. M...

The construction and performance of a fluorescence polarization spectrophotometer is described, the parts of which are mostly commercially available items. The instrument uses two photomultipliers to detect separately each polarized component of the fluorescent light. The ratio of the components is plotted continuously by means of a ratio recorder while the wave length of the exciting light is ...

In Nepal, the supply of fish inside the country does not meet the domestic need and is imported from neighboring countries mainly from India. Therefore, fishes are stored in ice for a long time before they arrive to the local market in Nepal. Thus, there is a high chance of treating the fish with formaldehyde solution (formalin) to preserve the shelf life. An attempt was taken to assess the fis...

A common technique of measuring population density of microorganisms grown in liquid media is to withdraw a sample of the suspension and measure its apparent optical density with a spectrophotometer. The device we describe is capable of continually and automatically monitoring the population density of microorganisms grown in suspension.