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Biomedical subjects

I H Qureshi

Publications and source records attributed to I H Qureshi.

7 recordsLinked to original sources
PubMed1999

Determination of natural radioactivity in building materials used in the Rawalpindi/Islamabad area by gamma-ray spectrometry and instrumental neutron activation analysis.

Samples of sand and manufactured building materials collected from the Rawalpindi/Islamabad area have been analyzed for the primordial natural radionuclides 238U, 232Th and 40K using gamma-ray spectrometry. The uranium and thorium contents have also been determined by instrumental neutron activation analysis (INAA). The specific activities of these radionuclides in the samples are compared with those of the world averages for soil. The comparison shows that, of the nine samples analyzed, only the three brick samples have higher activities than the world averages for soil. The specific activities in these materials, having a radium equivalent activity of less than 370 Bq kg-1, when evaluated for radiological effects show that all materials meet the external gamma-ray dose limitation of 1.5 mSv y-1. The gamma-spectrometric and INAA techniques complemented each other well in this study.

Calibration↗
PubMed1994

Toxic heavy metals and other trace elements in foodstuffs from 12 different countries. An IAEA coordinated research program.

A research program related to the assessment of toxic heavy metals and essential trace elements in foodstuffs has been carried out in 12 countries under the auspices of the IAEA. The main purpose of this program was to obtain data on the elemental concentrations of potentially toxic elements in foodstuffs in various countries, and to compare them with the maximum permissible levels specified in national legislation and international guidelines. High-priority elements for this study were As, Cd, Cr, Pb, Hg, and Se. Also of interest, but of lower priority, were Sb, Cu, and Zn. Emphasis was placed on the use of nuclear and nuclear-related analytical techniques, complemented by conventional methods, and on quality assurance.

Food Analysis↗
PubMed1989

Toxicity and anticoagulant activity of Salvia splendens.

Toxicological studies carried out on aqueous extract of Salvia splendens commonly known as Red Sage reveals that the drug is toxic only in higher doses and causes hemorrhages. LD50 of S. splendens is 1287.3 mg/Kg. Salvia splendens possesses anticoagulant property. The aqueous root extract of Salvia splendens increases the clotting time of dog's plasma by increasing the normal prothrombin time from 10-15 seconds to 35 seconds. Furthermore, the anticoagulant activity depends upon the part of the plant i.e. flowers, aerial parts and roots.

Journal Article↗
PubMed1987

Determination of lead and cadmium in milk by electrothermal atomic absorption spectrophotometry.

The concentration of lead and cadmium in different kinds of milk samples (powdered, infant formula, market, buffalo, condensed and human) were determined using electrothermal atomic absorption spectrophotometric technique. Among all the varieties of milk analysed, condensed milk was found to contain much higher amount of lead. Human milk as expected was found to have lowest concentration of these elements. The results were compared with the reported values of other countries. Daily intake of these toxic elements by adults and babies up to the age of six months through the consumption of various types of milk was estimated and compared with the tolerance levels.

Animals↗
PubMed1977

Trace element analysis: a diagnostic tool.

Human body continuously assimilates a variety of elements from the environment and the concentration of these elements in blood is regulated by means of various homeostatic mechanisms. Some of the elements, though present in very small amounts perform highly specialized functions in initiating many biochemical reactions. These elements, known as essential trace elements, are closely related to human diseases as their deficiency or excess induces physiological changes. Many diseases such as hypertension, atherosclerosis, diabetes etc are related to trace element imbalance. Therefore the measurement of trace elements in body fluids and tissues can be effectively employed for diagnostic tests.

Animals↗