A gastrulation center is described in ascidian eggs. Extensive cytoplasmic rearrangements occur in ascidian eggs between fertilization and first cleavage. During ooplasmic segregation, a specific cytoskeletal domain (the myoplasm) is translocated first to the vegetal pole (VP) and then to the posterior region of the zygote. A few hours later, gastrulation is initiated by invagination of endoder...

the purpose of this study was to compare the presence or absence of uv irradiation on the separation performance and morphology of the tio2-assembled thin film membranes (in different concentrations). furthermore, an attempt was made to show and compare the effect of the presence of tio2 nanoparticles in aqueous and organic phases during the interfacial polymerization process. sem, zeta potenti...

in the present work, the znfe2o4 nanoparticle has been successfully synthesized. the obtained sample was characterized by x-ray diffraction (xrd), emission scanning electron microscopy (fe-sem) and its optical property was examined by uv-vis spectrophotometer. fe-sem revealed that the particle size of the znfe2o4 of about 47 nm was synthesized. the photocatalytic performance under uv-vis and vi...

The effect of postharvest UV-C irradiation on phenolic compounds accumulation was investigated in berries of ‘Rishbaba’ table grape (Vitis vinifera cv. Rishbaba). Grape clusters were harvested at mature stage and irradiated with UV-C using fluorescent germicidal lamp (30 W, 90 cm) with a peak emission at 254 nm for 0 (control), 5 and 10 min. UV-C treatment had significant effect on individual p...

PURPOSE Human γD crystallin is a principal protein component of the human eye lens and associated with the development of juvenile and mature-onset cataracts. Exposure to ultraviolet (UV) light is thought to perturb protein structure and eventually lead to aggregation. This work is aimed at exploring the effects of UV-C irradiation on recombinant human γD-crystallin (HGDC). METHODS Recombinan...

Vacuum-uv/Sendai virus/SDS-polyacrylamide gel electrophoresis Taking advantage of having assay techniques for various functions located in nucleocapside (infectivity) and in the envelope (hemagglutination, neuraminidase activity and hemolysis), effects of vacuum-uv radiation on Sendai virus were investigated. Monochromatic 163-nm photons from a bromine discharge lamp and polychromatic synchrotr...

Capacitance-voltage C-V measurements are used to determine the effect of vacuum ultraviolet VUV and ultraviolet irradiation on mobile charges in porous low-k organosilicate SiCOH dielectrics. Hysteresis in the C-V characteristics shows that VUV irradiation increases the number of mobile charges in the dielectric. This is because VUV photons excite the trapped electrons from defect states to mak...

Acute ultraviolet light B (UVB) injury is associated with dermal mast cell histamine release. The possibility that histamine-stimulated prostaglandin (PG) synthesis could be a mechanism for irradiation erythema was therefore examined using human skin explants. Explants responded to UV irradiation (120 mJ/cm2) with a fivefold increase in synthesis of prostaglandins E2, F2 alpha and 6-keto PGF1 a...

Caging of the amidinium moieties of two representative bisbenzamidine DNA binders with suitable photoresponsive protecting groups suppresses their DNA-binding, which can then be fully recovered upon irradiation with UV light that removes the caging groups, regenerating the parent compounds. Moreover, a caged aza-pentamidine (©1a) is inert against Candida albicans, but displays a potent growth i...

The plasmid pMucAMucB, constructed from the Haemophilus influenzae vector pDM2, and a similar plasmid, constructed from pBR322, increased the survival after UV irradiation of Escherichia coli AB1157 with the umu-36 mutation and also caused UV-induced mutation in the E. coli strain. In H. influenzae, pMucAMucB caused a small but reproducible increase in survival after UV irradiation in wild-type...