The reproductive strategy of diatoms includes asexual and sexual phases, but in many species, including the model centric diatom Thalassiosira pseudonana, sexual reproduction has never been observed. Furthermore, the environmental factors that trigger sexual reproduction in diatoms are not understood. Although genome sequences of a few diatoms are available, little is known about the molecular ...

Quaternary ammonium salt namely 4-methyl-4-[2-(naphthalen-2-yl)-2-oxoethyl] morpholin-4-ium iodide (WSMPM) was synthesized and characterized. High molar absorptivity at 347 nm (1910 L･mol-1･cm-1) good solubility in distilled water (10-2 M) allows WSMPM to be used as an effective photoinitiator also water-soluble systems. Photopolymerization of acrylamide monomer with (10-3 a tertiary amine (N-m...

I f a frog’s skeletal muscle is soaked in modified R inger’s fluid, containing bromide, n itra te or iodide in place of chloride, the tension and duration of a tw itch, and its heat production, are largely increased, in the order B r < N 0 3 < I. In a tetanic contraction, however, the tension, the heat production and the velocity of shortening under any load are unaffected. The prim ary effect ...

The densi ty, viscosity a n d dielectric cons tan t of aqueous prol ine a n d hydroxypro l ine solut ions have been de te rmined a t 25 °C. The resul ts a p p e a r t o indicate t h a t t h e two aminoac ids have a des t ruc t ive effect on t h e molecular wa te r aggregates . The equivalent conduc tance of t e t r a m e t h y l a m m o n i u m iodide a n d t e t r a b u t y l a m m o n i u m i...

The impact of low level dust on the thyroid function of workers chronically exposed to ammonium perchlorate (AP) is uncertain and controversial. The aim of this study was to examine whether workers in China with long-term (>3 years) occupational exposure to low levels of AP dust had affected thyroid homeostasis. Mean occupational exposures to AP dust ranged from 0.43 to 1.17 mg/m3. Geometric me...

Lead halide perovskites are outstanding materials for optoelectronics, but they typically feature low stability against external agents. To overcome this drawback, LHPs based on quaternary ammonium cations, such as phenyl viologen lead iodide (PhVPI), were found to be promising candidates, being water-resistant and thermally stable. In Letter, the optoelectronic properties of PhVPI investigated...

The effectiveness of liposome-mediated gene transfer methods hinges, in part, on the nature of the interaction between the DNA cargo and the liposomes. Here we have examined the effect of quaternization of the cytofectin cationic head group on this interaction and the effect of concentration of the biocompatible, protective polymer polyethylene glycol(2000) (PEG(2000)) on transfection activity....