the solubility of k2so4 in water at 25°c was determined. comparing the value ofthermodynamic solubility product constant, ksp(th), (ksp(th) = exp (-δgodiss rt) of the mentionedsalt to the value of concentration solubility product, ksp(c) which is obtained from the observedsolubility, s/mol-1, ksp(c) = 4s3, revealed a great difference. the difference can be satisfactorilyexplained using debye- h...

The title salt, C(10)H(7)N(2) (+)·HSO(4) (-), is formed by the transfer of a proton from H(2)SO(4) to the N atom of 2-cyano-quinoline during crystallization. The quinoline ring system is approximately planar with a maximum deviation of 0.013 (3) Å. In the crystal, the cations are linked to the anions via inter-molecular N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds, forming a layered network.

BACKGROUND Patch testing is an essential procedure in the investigation of eczema in children. OBJECTIVES To analyse the frequency of contact hypersensitivity and allergic contact dermatitis among Polish children with eczema. PATIENTS/METHODS During an allergy screening programme involving 9320 children aged 7 and 16 years, 12.6% reported symptoms of chronic/recurrent eczema. From this grou...

The sodiumand potassium-activated adenosine triphosphatase (Naf + K+)-ATPase was partially purified from a microsomal fraction of whole rabbit brain, homogenized in a deoxycholate buffer. Suspension and separation by flotation of the resulting lipoproteins in a linear gradient of potassium iodide formed the basis of a rapid preparative technique, whereby the enzyme-containing lipoproteins were ...

The asymmetric unit of the title salt, K(+)·C(13)H(14)BF(3)NO(2)·0.5H(2)O, consists of two derivatized indolyltrifluoridoborate anions, two potassium cations and one water mol-ecule. Within the indolyltrifluoro-borate anions, the least-square planes consisting of the carboxyl group and the adjacent quarternary C atom of the tert-butyl groups deviate significantly from coplanarity with the indol...

BACKGROUND As a modification of patch testing, the strip patch test was established to obtain more sensitive and reliable test results. Comparative data on diagnostic accuracy for both tests are missing. OBJECTIVES To compare the diagnostic accuracy of strip patch tests and patch tests in detecting sensitizations in patients with suspected allergic contact dermatitis by using patient history ...

Phosphofructokinase (EC 2.7.1.11) from carrot roots was activated by a number of salts. Increase in salt concentration beyond the optimum generally led to a decrease in enzyme activity. Salts of the multivalent anions sulfate and phosphate were very effective activators and inhibitors. Potassium acetate and potassium succinate were also activators. Potassium tartrate and potassium citrate produ...

The crystal structure of the title salt, C12H9N2 (+)·HSO4 (-)·H2O, comprises inversion-related pairs of phenazinium ions linked by C-H⋯N hydrogen bonds. The phenazinium N-H atoms are hydrogen bonded to the bis-ulfate anions. The bis-ulfate anions and water mol-ecules are linked by O-H⋯O hydrogen-bonding inter-actions into a structural ladder motif parallel to the a axis.