Einkorn and emmer wheat together with barley were among the first cereals domesticated by humans more than 10,000 years ago, long before durum or bread wheat originated. Domesticated einkorn wheat differs from its wild progenitor in basic morphological characters such as the grain dispersal system. This study identified the Non-brittle rachis 1 (btr1) and Non-brittle rachis 2 (btr2) in einkorn ...

Many plant and animal species reproduce both sexually and asexually. These 2 reproductive modes are both likely to be costly and, in many species, they occur at different times of the year. Here, I present information on the sexual and asexual reproductive biology of the brittle star Ophiactis savignyi (Echinodermata, Ophiuroidea) in the Florida Keys, USA. Small brittle stars (less than 3 mm) a...

Recent interest in Arctic exploration has brought new challenges concerning the mechanical behavior of lightweight materials for offshore structures. Exposure to seawater and cold temperatures are known degrade properties several materials, thus, compromising safety personnel This study aims investigate low-velocity impact woven carbon/vinyl ester sandwich composites with Polyvinyl chloride (PV...

A total of nine specimens were constructed and tested under cyclic loads to investigate the differences in seismic behavior between glass fiber-reinforced polymer (GFRP)-reinforced concrete (RC) joints RC beam-to-column joints. The experimental parameters included stirrup ratios, axial pressure ratios strength loading test results showed that GFRP-RC can withstand significantly high lateral def...

As a porous brittle material, oil well cement in and gas cementing is difficult to bear complex loads, which can easily lead the failure of mechanical integrity sheath. In this paper, SiO 2 coating-CF toughening material was obtained by modified carbon fibers (CFs) surface. addition, properties mechanism coated-CF stone were discussed. The results showed that paste are significantly improved. A...

Two unrelated children presenting with mental and physical retardation and sulphur deficient brittle hair are reported. These are thought to be further cases of the autosomal recessive neurotrichocutaneous syndrome of Pollitt, of which eight cases have been previously reported.

BACKGROUND Anti-cancer potential of marine natural products such as polysaccharides represented therapeutic potential in oncological researches. In this study, total polysaccharide from brittle star [Ophiocoma erinaceus (O. erinaceus)] was extracted and chemopreventive efficacy of Persian Gulf brittle star polysaccharide was investigated in HeLa human cervical cancer cells. METHODS To extract...

High-velocity (-•2 to -•5 km/sec) impacts into octahedrite iron meteorites (Gibeon, El Sampal, and Arispe), steel, and iron targets were made at the NASA-Ames Vertical Gun Facility. The experiments clearly revealed the brittle behavior of meteorites at very low temperatures (<200 ø K) as indicated by spallation of the crater rim and the development of deeply penetrating fractures in the meteori...

[1] The characterization of time-dependent brittle creep, promoted by chemically active pore fluids, is fundamental to our understanding of the long-term evolution and dynamics of the Earth’s crust. Here we report results from a study of the influence of temperature on both short-term strength and time-dependent brittle creep in three sandstones under triaxial stress conditions. We show that an...