Studies of the occurrence, distribution and aqueous geochemistry of arsenic in the environment requires accurate and sensitive analytical measurements. In addition to the determination of total arsenic concentrations, speciation of the form in which arsenic occurs plays a major role in its chemical reactivity and toxicity. Determination of speciation includes: the distribution of oxidation stat...

Protein microarrays, an emerging class of proteomic technologies, are fast becoming critical tools in biochemistry and molecular biology. Two classes of protein microarrays are currently available: analytical and functional protein microarrays. Analytical protein microarrays, mostly antibody microarrays, have become one of the most powerful multiplexed detection technologies. Functional protein...

background: due to some limitations of serological methods in diagnosis of patients infected with hiv-1 (human immunodeficiency virus) and hcv (hepatitis c virus), it is profoundly important to use molecular methods for the detecting of these infectious agents. however, the most significant problems are the exorbitant cost of these methods and the need of a thermocycler which is an expensive in...

Aptamer-based sensors have been intensively investigated as potential analytical tools in clinical analysis providing the desired portability, fast response, sensitivity, and specificity, in addition to lower cost and simplicity versus conventional methods. The aim of this review, without pretending to be exhaustive, is to give the readers an overview of recent important achievements about elec...

  Background: Due to some limitations of serological methods in diagnosis of patients infected with HIV-1 (human immunodeficiency virus) and HCV (hepatitis C virus), it is profoundly important to use molecular methods for the detecting of these infectious agents. However, the most significant problems are the exorbitant cost of these methods and the need of a thermocycler which is an expensive...

objective: depression is the most common co-morbid psychiatric disorder in patients with epilepsy. yet it remains under recognized and under-treated. for depression screening in this patient need to a convenient questionnaire for patients with epilepsy. this questionnaire has shown high sensitivity for depression screening in many studies. the center for epidemiological studies depression scale...

purpose: uncorrected visual acuity is the only variable measured in vision screening programs in many countries worldwide. the aim of this study was to calculate the sensitivity, specificity, and predictive value of the uncorrected visual acuity in the screening programs for the diagnosis of refractive errors. methods: in this cross-sectional study, of 4,157 students in the first year of primar...

background: to determine the sensitivity, specificity, positive predictive value (ppv), and negative predictive value (npv) of the national vision screening program for 7 yr old children in iran. methods: in this cross-sectional study, eight cities in iran were selected through multistage cluster sampling. selected cities were sari, birjand, ardabil, mashhad, bandar abbas, dezful, yazd, and ara...

background: considering that elisa method presently is the test of choice for diagnosis of fasciolo­sis, the present study was undertaken to evaluate the maximum validity of coated plates at dif­ferent temperatures and different times during one year of evaluation. methods: serum samples of patients infected with fasciolosis (n=10), hydatidosis (n=5), toxocaria­sis (n=5), and negative control s...

hyperbilirubinemia is a common problem in neonates and causes serious complications. thus, serial measurements of bilirubin should be done. this assessment is done through two methods of laboratory measurement in serum sample and transcutaneous bilirubinometer. this descriptive study compared transcutaneous bilirubin assessment and laboratory serum bilirubin. bilirubin level was assessed among ...