In spite of being widely used for in liquid biosensing applications, sensitivity improvement of conventional (5-20MHz) quartz crystal microbalance (QCM) sensors remains an unsolved challenging task. With the help of a new electronic characterization approach based on phase change measurements at a constant fixed frequency, a highly sensitive and versatile high fundamental frequency (HFF) QCM im...

I review the constraints imposed by the observed extragalactic background light (EBL) on the history of the stellar birthrate in galaxies. At faint magnitudes, the logarithmic slope of the galaxy counts is flatter than 0.4 in all seven UBV IJHK optical bandpasses of the Hubble Deep Field-South imaging survey. The integration of the number counts provides a lower limit to the surface brightness ...

Increased water scarcity necessitates the implementation of water-conserving irrigation management practices to sustain crop production, especially in water-limited areas. Field experiments were conducted evaluate midday leaf potential (LWP) bell pepper (Capsicum annuum L. var. annuum) irrigated differentially using surface drip (DI) and subsurface (SDI) systems during 2016 2017 growing seasons...

In vitro effects of penicillin, sulbactam, cefazolin, and amikacine on the activity of the enzyme glucose6-phosphate dehydrogenase in sheep liver were investigated. Glucose 6-phosphate dehydrogenase was purified from sheep liver, using a simple and rapid method. e purification consisted of two steps, preparation of homogenate and 2’, 5’-ADP Sepharose 4B affinity chromatography. As a result of ...

The antioxidant food additives 2(3)-tert-butyl-4-hydroxyanisole (BHA), 2,6-di(tert-butyl)-p-cresol (BHT) and the methyl and propyl esters of gallic acid inhibited Trypanosoma cruzi culture growth and oxygen consumption. The I50 values for growth and oxygen uptake with BHA were 0.284 and 0.400 and for BHT 0.083 and 0.235 mM, respectively. Moreover, BHA inhibited the respiration of several tumor ...

The effect of 2-benzylamino-1,3,5-triazines on photosynthetic electron transport (PET) was measured with thylakoids isolated from atrazine-resistant, wild-type Chenopodium album, and spinach to find novel 1,3,5-triazine herbicides bearing a strong PET inhibition. The PET inhibition assay with Chenopodium (wild-type and resistant), yielded a resistance ratio (R/W = I50 (resistant)/I50 (wild-type...

In order to characterize the structural and functional alterations in the catalytic properties of the bcl complex that are associated with specific amino acid replacements in center P cytochrome b deficient mutants, we investigated the enzymatic and myxothiazol inhibition properties of two yeast mutants (1,2), some of their revertants (3,4,5) and those of the parental strain. In the framework o...

Assessing the impact of planting methods and irrigation levels is needed to determine effects on maize root morphological traits, grain yield, water productivity in semi-arid regions. A study was initiated (Zea mays L.) from 2015 2016, including three [i.e. broad bed furrow (BBF), shallow narrow (SNF) deep wider (DWF)] four once ten days (I10D), at 40% depletion available soil moisture (DASM, I...

The characteristics of K+ transport in erythrocytes from the river lamprey (Lampetra fluviatilis) were investigated using standard radioisotope flux techniques. The cells were shown to have a ouabain-sensitive transport pathway that carried 43K+ and 86Rb+ into the cell at similar rates. Most of the ouabain-resistant 43K+ and 86Rb+ influx was via a pathway that was insensitive to cotransport inh...