feldspar grains, as a significant provenance indicator, of two terrigenous formations from central iran, the upper red formation, and moghan area, zivah formation, are used for provenance determination and the study of transportation and depositional history. the upper red formation (urf) is volumetrically the most important siliciclastic unit of the central iran and zivah formation (zf) repres...

The hydrolysis of cadmium nitrate was studied spectrophotometrically at different ionic strengthsof sodium perchlorate in a wide pH range, 1-12, and at 25 C. Least squares calculations areconsistent with the formation of M(OH)+, M(OH)2, M(OH)3- and M(OH)42- species, which M isCd2+. The dependency on ionic strength in the background electrolyte solutions was taken intoaccount by using a Debye-Hu...

Understanding how cells polarize and coordinate tubulogenesis during organ formation is a central question in biology. Tubulogenesis often coincides with cell-lineage specification during organ development. Hence, an elementary question is whether these two processes are independently controlled, or whether proper cell specification depends on formation of tubes. To address these fundamental qu...

Formation of leaves and floral organs involves down-regulation of meristem-specific homeobox genes, and de novo expression of genes for organ identity, growth and patterning. Genes required for all these aspects of organ formation have been identified. The challenge now is to establish how they interact to direct organogenesis.

Biofilm formation is often considered to be the underlying reason why treatment with an antimicrobial agent fails and as an estimated 65-80% of all infections is thought to be biofilm-related, this presents a serious challenge. Considerable attention has been devoted to the development of modified materials that prevent (or at least drastically reduce) microbial biofilm formation. In this revie...

Recently evidence has accumulated that there are various interactions between the different levels of the central reticular core of the brain stem. (DELL, BONVALLET and HUGELIN 1961 ; MORUZZI 1964). The present study was initiated to know how the mesencephalic reticular formation (MRF) acts to regulate activity of the pontine reticular formation (PRF). This MRF-originated, descending effect con...

using uv-vis spectrophotometric method the interaction of water soluble phthalocyanine, cobalt(ιι) 4,4′,4′′,4′′′- tetrasulfophthalocyanine(cotspc), with bovine serum albumin (bsa) to determine the formation constant and related thermodynamic functions. the measurements were considered in 1mm sodium phosphate buffer, ph 7.0 and at 5 different temperatures 20, 25, 30, 35 and 40ºc. the results sho...