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Export coefficient models (ECMs) are often used to predict nutrient sources and sinks in watersheds because ECMs can flexibly incorporate processes and have minimal data requirements. However, ECMs do not quantify uncertainties in model structure, parameters, or predictions; nor do they account for spatial and temporal variability in land characteristics, weather, and management practices. We a...

40 min after a single injection of 50 microCi of tritiated thymidine a 3 mm punch of DBA-1 mouse skin contains about 1000 dpm. This value remains constant for at least 48 hr after injection. 50 hair follicles contain about 40 dpm, and from these values the activity calculated to reside in the basal layer of a 3 mm punch of skin is 760 dpm. These values also remain constant with time after injec...

A new Monte Carlo (MC) algorithm, the 'dose planning method' (DPM), and its associated computer program for simulating the transport of electrons and photons in radiotherapy class problems employing primary electron beams, is presented. DPM is intended to be a high accuracy MC alternative to the current generation of treatment planning codes which rely on analytical algorithms based on an appro...

The concept of overcoming multidrug resistance using modulators is based on the hypothesis that there will be a synergistic interaction between the modulator and the cytotoxic agent. We examined the ability of dipyridamole (DPM) to synergistically enhance drug sensitivity in drug-sensitive KB-3-1 cells and their drug-resistant variants, KB-GRC1 and KBV1 cells, using median effect analysis to pr...

OBJECTIVE To compare dental plaster model (DPM) and cone-beam computed tomography (CBCT) in the measurement of the dental arches, and investigate whether CBCT image artifacts compromise the reliability of such measurements. MATERIALS AND METHODS Twenty patients were divided into two groups based on the presence or absence of metallic restorations in the posterior teeth. Both dental arches of ...

Some difficulties are often encountered when studying the conformation of saccharides by means of p.m.r. spectroscopy: the spectra are rather complex so that coupling constants and chemical shifts of the particular protons cannot be distinguished. The introduction of certain complexes of lanthanides possessing paramagnetic pro­ perties, so-called "shift reagents", into this field was of great i...

The effects of endurance training (running 40 m/min grade for 60 min, 5 days/wk for 8 wk) on skeletal muscle lactate removal was studied in rats by utilizing the isolated hindlimb perfusion technique. Hindlimbs were perfused (single-pass) with Krebs-Henseleit bicarbonate buffer, fresh bovine erythrocytes (hematocrit approximately 30%), 10 mM lactate, and [U-14C]lactate (30,000 dpm/ml). Arterial...

INTRODUCTION The present study aimed to evaluate a rapid and inexpensive colorimetric nitrate reductase assay (NRA) performed directly on sputum specimens for detection of drug resistance in Mycobacterium tuberculosis (MTB). METHODOLOGY A total of 55 sputum samples were decontaminated and processed by modified Petroff's method.  A part of the resulting suspension was used to perform direct NR...