To explore the mechanical failure characteristics of bolted joints under different bolt installation angles and effect bolting on shear strength joints, a numerical model structural plane anchoring with was established based improved Pile element, series uniaxial compression tests were carried out to systematically study effects angle bolts. The results show that as increases, peak stress speci...

OBJECTIVE The authors examine the pattern of direction errors made during the manipulation of a physical simulation of an underground coal mine bolting machine to assess the directional control-response compatibility relationships associated with the device and to compare these results to data obtained from a virtual simulation of a generic device. BACKGROUND Directional errors during the man...

Molecular biologists are rapidly characterizing the genetic basis of flowering in model species such as Arabidopsis thaliana. However, it is not clear how the developmental pathways identified in controlled environments contribute to variation in reproductive timing in natural ecological settings. Here we report the first study of quantitative trait loci (QTL) for date of bolting (the transitio...

Radish flower color, bolting time, and flowering time are important traits for attracting certain pollinators affect fleshy root quality. In this study, an analysis of the anthocyanidins in radish flowers by high-performance liquid chromatography revealed that differences cyanidin content likely to be associated with variability colors (i.e., purple white petals). A quantitative trait loci (QTL...

DNA topoisomerase I alpha (TOP1α) plays a specific role in Arabidopsis thaliana development and is required for stem cell regulation in shoot and floral meristems. Recently, a new role independent of meristem functioning has been described for TOP1α, namely flowering time regulation. The same feature had been detected by us earlier for fas5, a mutant allele of TOP1α In this study we clarify the...

Hydrogen peroxide (H(2)O(2)) is discussed as being a signaling molecule in Arabidopsis (Arabidopsis thaliana) leaf senescence. Intracellular H(2)O(2) levels are controlled by the H(2)O(2)-scavenging enzyme catalase in concert with other scavenging and producing systems. Catalases are encoded by a small gene family, and the expression of all three Arabidopsis catalase genes is regulated in a sen...

Background Bolting is regarded as the initiation of reproduction stage in the growth and development of an Arabidopsis plant, when a set of floral integrator genes activate the expression of floral meristem identity genes LFY and AP1 to initiate flowering transition[1,2]. However, how the expression of key genes, such as AP1, responds of diverse signals during flower development remains largely...

the first records of anopheles fluviatilis resistance to ddt was reported in 1963 from india and to dieldrin from eastern saudi arabia in 1959. in southern iran, antimalaria measures began in 1950 and up to 1957 the area was under ddt residual house spraying at the rate of 2g /m2 one round/year. during 1958-59 dieldrin was used at 0.5 g/m2, 1or 2 rounds/year was applied in the lowland areas. in...