introduction quality control techniques used to test the components of the radiological system and verify that the equipment is operating satisfactorily. in this study, quality control (qc) assessment of conventional radiology devices was performed in frequently visited radiology centers of khuzestan province, iran. materials and methods fifteen conventional radiology devices were examined, bas...

nowadays, tube bonding in vehicles structure is noticeably considered by many researches. in this paper, local tube compression process by a rubber ring has been studied. firstly, simulation of the process was performed by fem. then, experimental test has been carried out to validate the numerical results. numerical and experimental results were compared showing a good agreement. in the second ...

Higher plants don't have motile sperm; they rely on pollen tubes to deliver them. Recent research has identified key components involved in pollen tube tip bursting that allow sperm release and fertilization.

The antique building combines traditional design with contemporary technology, making it an important structural style. Columns, as a crucial component, directly affect how well the functions whole. This paper proposes new connection form upper square concrete-filled steel tube-lower circular tube (USCFST-LCCFST). study investigates seismic performance of proposed columns. First, finite element...

Abstract In order to apply the high nitrogen-content tetrazole derivatives (TZD), a class of energy materials with great potential, into gun propellant, we propose novel idea that grafting acidized TZD onto cellulose and then nitrifying grafted obtain nitrocellulose by (TZDNC). Theoretical predictions suggest Replacing (NC) TZDNC, due having higher TZDNC than traditional NC, can evidently reduc...

* The effects of actinomycin D and cycloheximide on RNA and protein synthesis were investigated during pollen tube development of Pinus bungeana. * RNA and protein contents, protein expression patterns, cell wall components and ultrastructural changes of pollen tubes were studied using spectrophotometry, SDS-PAGE electrophoresis, Fourier transformed infrared (FTIR) microspectroscopy and transmi...

Calcium is a key regulator of pollen tube growth, but little is known concerning the downstream components of the signaling pathways involved. We identified two pollen-expressed calmodulin-like domain protein kinases from Petunia inflata, CALMODULIN-LIKE DOMAIN PROTEIN KINASE1 (Pi CDPK1) and Pi CDPK2. Transient overexpression or expression of catalytically modified Pi CDPK1 disrupted pollen tub...

A successful cross fertilization involving two different species implies that a chain of reproductive process takes place unhampered after pollination. The coordination and interaction between genes or gene complexes in the pollen parent and matching gene or gene complexes in the pistil parent should be hormonious. Understanding of pollen tube growth and pollen attrition is revealed from the st...