The foliage of fifteen day-old Vigna radiata seedlings was sprayed with water (control) or with a 10–10 M, 10–8 M or 10–6 M aqueous solution of 28-homobrassinolide (HBR). Samples of the treated plant material, collected at 30/50 days after sowing (DAS), were assessed for the activities of carbonic anhydrase (CA) and nitrate reductase (NR); leaf chlorophyll content (Chl); stomatal conductance (g...

Eight red maple (Acer rubrum L.) provenances, four each from wet and dry sites, were grown under the same conditions and their physiological responses to soil water availability investigated. Under well-watered conditions, seedlings of wet-site provenances grew faster and had consistently higher net photosynthesis, leaf conductance, maximum carboxylation rate, maximum rate of coupled photosynth...

The objective of this study was to evaluate the ability foliar application potassium nitrate (KNO3) induce water deficit tolerance in sorghum plants (Sorghum bicolor cv. P898012) subjected at pre-flowering. experiment conducted under greenhouse conditions with 4 treatments: field capacity (FC), (WD), + KNO3 (FC KNO3), and (WD KNO3). Two applications 3% (m/v) were made, first on day zero stress ...

The objective of this study was to evaluate the gas exchange and leaf area requirement for yield six tall ‘Prata’ banana genotypes, under semi-arid conditions. genotypes ‘Pacovan’ (AAB), ‘Pacovan Ken’ (AAAB), ‘Preciosa’ ‘Japira’ ‘PV79-34’ (AAAB) ‘Garantida’ (four tetraploid hybrids one triploid cultivar) were evaluated in two cycles, arranged a completely randomized design factorial scheme, wit...

We set up a free-air ozone (O(3)) exposure system for determining the photosynthetic responses of Siebold's beech (Fagus crenata) and oak (Quercus mongolica var. crispula) to O(3) under field conditions. Ten-year-old saplings of beech and oak were exposed to an elevated O(3) concentration (60 nmol mol(-1)) during daytime from 6 August to 11 November 2011. Ozone significantly reduced the net pho...

nanotechnology is the study of manipulating matter on an atomic and molecular scale. generally, nanotechnology deals with developing materials, devices, or other structures possessing at least one dimension size from 1 to 100 nanometers .  carbon nanotubes have great potentials for novel applications in industry, drug delivery system and many other uses. in this work after purification, multiwa...

Epoxide carboxylase from Xanthobacter strain Py2 catalyzes the reductant- and NAD+-dependent carboxylation of aliphatic epoxides to beta-keto acids. Epoxide carboxylase from Xanthobacter strain Py2 has been resolved from cell extracts by anion-exchange chromatography into three protein components, designated I, II, and III, that are obligately required for functional reconstitution of epoxide c...

Vitamin K is required for the carboxylation of Gla-proteins in the liver (coagulation factors) and extra-hepatic tissues, such as bone (osteocalcin, OC), and arterial wall (matrix Gla-protein, MGP). Although the coagulation factors are essentially fully carboxylated under normal conditions, 10-40 % of OC and MGP remains undercarboxylated. We were therefore interested to study the dose-response ...