The presence oí aggregates oí humic substances (HS) with inorganic adsorbates in a lagaon located in Huelva (south Spain) ia reported. The chemical nature oftbe fulvic acid (FA) fraction, extracted froro the natura] aggregate by treatment with chelating resins, has been investigated by physical and chemical methods. Tbe results suggest that these FA are similar f.o FA from other aquatic environ...

The microstructure and dissolubility of a calcified enterolith and enterolith pieces removed from a 26-year-old Japanese woman with Crohn's disease were analyzed using scanning electron microscopy and energy dispersive X-ray spectroscopy. The enterolith showed a multilayered structure with fatty acid calcium and magnesium phosphate. The amount of calcium, magnesium, and phosphate decreased afte...

objectives: according to the gateway drug theory, tobacco use is a predisposing factor for future substance abuse. this study was conducted to compare nicotine and opiate dependents to identify the differences between their personality traits and psychopathology that makes them turn to other substances after cigarette smoking. methods: a causal-comparative study was conducted. three groups were...

Abstract Inorganic pigments have been very important substances for human life thousands of years. They contributed and continue to contribute the beautification our daily habitat accentuation differentiation objects, influence thoughts, moods, feelings. The industrial manufacture inorganic based on growing chemical physical knowledge started around 1800. Before that, natural materials or manuf...

The serum and 24 hour urinary excretion levels of various lithogenic and inhibitory substances were assessed in 24 male patients with calcium stone and no previous history of urolithiasis and in 19 age-matched controls. Two groups did not differ significantly (P < 0.01) except in the excretions of sodium, citric acid (being higher in normals) and inorganic phosphate (being higher in patients). ...

Some inorganic anions such as BF4 , CF3COO , ClO4 , and H2PO4 , can affect the solubility of proteins and amino acids. Their effects were observed since 1888 by Fran Hofmeister. During the past decade, these ions have been used increasingly in reversed-phase high-performance liquid chromatography (HPLC), because of their abilities to improve the retention of basic substances in their protonated...

The complex chemical nature of Indian cobra (Naja naja) venom was indicated by Ganguly & Malkana (1936) and Ganguly (1937), who reported its percentage composition as follows: total protein 87-56, globulin 20*31, albumin 39-69, primary proteose 11 31, secondary proteose 16-81. In addition to proteins, the venom was found to contain cholesterol, phospholipins, inorganic substances and colouring ...

Heparin is widely used as an anticoagulant in biochemical laboratories. Hawk, Oser, and Summerson (1947) state that heparin is an excellent anticoagulant, as it does not alter the distribution of diffusible substances between cells and plasma. Jorpes (1946) states that heparin neither influences the volume of the blood corpuscles nor interferes with the chemical analysis. In the course of routi...

Introduction The competition for crops between human and insects is as old as agriculture. The use of chemical substances to control pests was started in the mid-1800s. In past, certain inorganic and organic compounds, including organochlorides, organophosphates, carbamatespyrethroids and formamides were used as insecticides. Because of the special properties of these chemicals, such as long re...

The literature dealing with the electrochemical corrosion of copper and possibility of its prevention using inhibitors is examined. Inorganic compounds are investigated as well, but organic compounds and their derivatives in much greater numbers. Researches are directed to influence of compounds structure, concentration, method of application as well as media that inhibitor is used in on inhibi...