Bee-collected pollen ("bee pollen") is promoted as a health food with wide range of nutritional and therapeutic properties. The objective the current study to evaluate contribution made through free radical scavenging capability bee-collected floval pollens by their flavonoid/phenolics constituents, determine whether this affected aging. effectiveness bee (EC(50)) measured DPPH method shown be determined nature levels constituent floral pollens, which can assayed via phenolics profiles HPLC....

Abstract Anthocyanin biosynthesis in leaves increases under stresses which also generate reactive oxygen species (ROS). In the present study hypothesis that red are better equipped to scavenge ROS than green was tested. Antioxidants leaf extracts from and morphs of Elatostema rugosum were identified, activities quantified using enzymatic α , ‐diphenyl‐ β ‐picrylhydrazyl (DPPH) assays cyclic voltammetry. Red E. held greater amounts superoxide dismutase, catalase, anthocyanins, hydroxycinnamic...

ABSTRACT The use of genetically modified plants offers unique opportunities to study the role specific flavonoids in plant UVB protection. Along with a parental wild‐type Mitchell Petunia , two transgenic lines altered were also examined; Lc enhanced levels antho‐cyanins due action maize flavonoid regulatory gene Leaf color and AFLS that carries an antisense fla‐vonol synthase construct is known have reduced flavonol flowers. All three grown near ambient sunlight, sunlight lacking (280–320...

A framework for discrete variable representation (DVR) basis sets is developed that suitable multidimensional generalizations. Those generalizations will be presented in future publications. The new axiomatization of the DVR construction places projection operators a central role and integrates semiclassical phase space concepts into basic framework. Rates convergence set expansions are emphasized, it shown method gives exponential convergence, assuming conditions analyticity boundary met....

Bee pollen is a mix of bee-collected floral pollens which varies widely in composition. A systematic method for characterising bee terms their constituent needed view the growing phytotherapeutic interest products. Studies involving three samples collected from Portugal and New Zealand are reported. An approach based on flavonoid/phenolics profiles derived high pressure liquid chromatography demonstrated to be more precise informative than traditional microscopy. This provides convenient...

We measured variations in leaf dark respiration rate (Rd) and nitrogen (N) across species, canopy light environment, elevation for 18 co-occurring deciduous hardwood species the southern Appalachian mountains of western North Carolina. Our overall objective was to estimate rates under typical conditions determine how they varied within among species. Mean at 20 °C (Rd,mass, μmol CO2 (kg dry mass)−1 s−1) all 7.31 kg−1 s−1. Rd,mass individual from 5.17 s−1 Quercus coccinea Muenchh. 8.25...

This work examines self-mixing in active nematics, a class of fluids which mobile topological defects drive chaotic flows system comprised biological filaments and molecular motors. We present experiments that demonstrate how geometrical confinement can influence the braiding dynamics defects. Notably, we show cardioid-shaped wells leads to realization golden braid, maximally efficient mixing state exactly three with no defect creation or annihilation. characterize braid using different...

Phospholipids are an essential constituent of cells with all life thought to produce these compounds either a glycerol or sphingoid moiety at their core. For the first time, we demonstrate that thermophilic bacterium, Limisphaera ngatamarikiensis NGM72.4T, produces third type phospholipid, serinophospholipids, which distinct from glycero- and sphingophospholipids by featuring serinol backbone instead. We show major serinophospholipid metabolites N,O-diacylserinophospho-N-methylethanolamine...

Stress-strain relations for random packings of entangling chains under triaxial compression can exhibit strain stiffening and sustain stresses several orders-of-magnitude beyond typical granular materials. X-ray tomography reveals the transition to this strong occurs when are long enough entangle an average about one chain each, which results in system-filling clusters entangled chains, similar Erdös-Rényi model randomly connected graphs. The number entanglements is nearly proportional area...

Microbial motion is typically analyzed by simplified models in which trajectories exhibit straight runs (perhaps with added Gaussian noise) followed random, discrete tumbling events. We present the results of a statistical analysis angular dynamics for four different swimming microbes: and smooth-swimming strains \textit{Bacillus subtilis} two Eukaryotic algae, \textit{Tetraselmis suecica} \textit{Euglena gracilis}. show that statistics closely resemble Voigt profile, convolution (L\'{e}vy...

We measured leaf respiration in 18 eastern deciduous forest tree species to determine if there were differences temperature-respiration response functions among or canopy positions. Leaf rates situ and on detached branches for Acer pensylvanicum L., A. rubrum Betula spp. (B. alleghaniensis Britt. B. lenta L.), Carya glabra (Mill.) Sweet, Cornus florida Fraxinus (primarily F. americana Liriodendron tulipifera Magnolia fraseri Walt., Nyssa sylvatica Marsh., Oxydendrum arboreum Platanus...

We derive an effective Hamiltonian for a quantum system constrained to submanifold (the constraint manifold) of configuration space ambient space) by infinite restoring force. pay special attention how this depends on quantities which are external the manifold, such as extrinsic curvature space, and constraining potential. In particular, we find remarkable fact that twisting potential appears gauge in Hamiltonian. This is closely related geometric phase originally discussed Berry. The also...