The anisotropic etching behavior of single-crystal silicon and the behavior of SiO2 and Si3N4 in an ethylenediaminebased solution as well as in aqueous KOH, NaOH, and LiOH were studied. The crystal planes bounding the etch front and their etch rates were determined as a function of temperature, crystal orientation, and etchant composition. A correlation was found between the etch rates and thei...

The antioxidant potential of crude methanol extract (CE) as well as chloroform (CF), ethyl acetate (EF) and n-butanol (NF) soluble fractions of Enhydra fluctuans Lour, which is widely used in indigenous system of medicine for different purposes, were studied. The antioxidant potential of extract/different fractions were evaluated using different in vitro antioxidant models. In addition, total a...

The ability of the electron transport particulate fraction of Azotobacter vinelandii strain O to oxidize tetramethyl-p-phenylenediamine (TMPD) and p-phenylenediamine (PPD) was examined in detail. The highest specific activity for TMPD and PPD oxidation concentrated in the A. vinelandii O R(3) fraction. The A. vinelandii O R(3) fraction was used to develop a standard manometric assay which gave ...

Three indicator displacement assays are described for the detection of phosphatidylserine in a bilayer membrane. A series of Zn-dipicolylamine coordination compounds are used to bind selectively to the phosphatidylserine and act as a colorimetric chemosensing ensemble when combined with the UV-Vis indictor pyrocatechol violet. A similar displacement assay uses a coumarin methylsulfonate derivat...

tin present in the pituitary gland and incubation medium was measured. A significant decrease in prolactin produc tion was observed in the glands from tumor-bearing rats. Incubation of these glands or normal pituitary glands with 4-(2-aminoethyl)pyrocatechol (dopamine) caused a sig nificant decrease in the amount of radioactive prolactin secreted into the incubation medium. The administration o...

Aloe vera mengandung saponin, pyrocatechol, glucomannan, lignin, asam amino dan vitamin sehingga berfungsi sebagai antiseptik alami, antimikroba, melembutkan kulit. Berdasarkan fakta tersebut maka ekstrak digunakan zat aditif pada formulasi sediaan sabun padat. Kualitas padat yang baik adalah telah sesuai dengan Standar Nasional Indonesia (SNI) mandi Penelitian ini bertujuan untuk menguji kuali...