Simultaneous underwater beam steering and PAM4 transmission enabled by the acousto-optic effect.

In this paper, an underwater wireless optical communication (UWOC) system that can simultaneously achieve beam steering and pulse amplitude modulation (PAM) enabled by the acousto-optic effect is proposed and experimentally demonstrated. An approach to manipulate the driving signal of an acousto-optic modulator (AOM) is utilized to simultaneously achieve precise laser emission angle control and signal modulation, which enables high-speed link-switching for multi-user access. The system is tested in a 7-m water tank with a water attenuation coefficient of 0.

Immunogenicity and safety of a SARS-CoV-2 mRNA vaccine (SYS6006) in healthy Chinese participants: A randomized, observer-blinded, placebo-controlled phase 2 clinical trial.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) mRNA vaccine enables quick upgrade of antigen sequence to combat emerging new variants. In an observer-blinded, randomized, placebo-controlled phase 2 trial, immunologically naïve 300 adults and 150 older participants were enrolled and randomized (1:1:1) to receive two doses of 20 µg or 30 µg of a SARS-CoV-2 mRNA vaccine (SYS6006) or placebo. Adverse events (AEs) were recorded through 30 days after the second dose.

Fisheye lens-based UWOC system with an FOV of ±90°.

The link alignment is a challenge in underwater wireless optical communication (UWOC). This paper proposes a UWOC system adopting a fisheye lens with a field of view (FOV) of ±90° at the receiver to alleviate alignment requirement, and a mobile scanning device (MSD) is exploited to track the variation of the imaging position generated by the fisheye lens due to different incidence angles. In a 7-m tap water channel, a transmission with a data rate of 400 Mbps and an FOV of ±90° is realized with 16-quadrature amplitude modulating-orthogonal frequency division multiplexing (16-QAM-OFDM) modulation and orthogonal matching pursuit (OMP) channel estimation algorithm.

90-m/560-Mbps underwater wireless optical communication utilizing subband multiple-mode full permutation CAP combined with an SNR-weighted detector and multi-channel DFE.

In this paper, a joint signal processing scheme including a subband multiple-mode full permutation carrierless amplitude phase modulation (SMMP-CAP), signal-to-noise ratio weighted detector (SNR-WD), and multi-channel decision feedback equalizer (MC-DFE) is proposed to mitigate the bandwidth limitation of a high-speed long-reach underwater wireless optical communication (UWOC) system. Referring to the trellis coded modulation (TCM) subset division strategy, 16 quadrature amplitude modulation (QAM) mapping set is divided into four 4-QAM mapping subsets by SMMP-CAP scheme. An SNR-WD and an MC-DFE are employed to enhance the demodulation effect of this system in a fading channel.

sp. nov., isolated from a freshwater mesocosm.

A bacterial strain, designated FSY-8, was isolated from a freshwater mesocosm in Taiwan and characterized using the polyphasic taxonomy approach. Cells of strain FSY-8 were aerobic, Gram-stain-negative, rod-shaped, non-motile and formed yellow coloured colonies on Reasoner's 2A agar. Growth occurred at 20-40 °C (optimum, 30-37 °C) and pH 5-7 (optimum, pH 6) and in the presence of 0-0.

sp. nov., isolated from a freshwater mesocosm.

A bacterial strain designated FSY-9 was isolated from a freshwater mesocosm in Taiwan and characterized to determine its taxonomic affiliation. Phylogenetic analyses based on 16S rRNA gene sequences and coding sequences of 92 protein clusters indicated that strain FSY-9 formed a phylogenetic lineage in the genus . Strain FSY-9 was most closely related to R1-4 with a 97.

sp. nov., isolated from water sampled from a rice paddy field.

Strain TER-1 was isolated from water sampled from a rice paddy field in Taiwan. Cells were Gram-negative, aerobic, motile, rod-shaped and formed pink-coloured colonies. Optimal growth occurred at 25-30 °C, pH 6-7 and in the presence of 0.

gen. nov., sp. nov., a new member of the family isolated from an artificial reservoir.

A bacterial strain, designated H-5, was isolated from an artificial reservoir in Taiwan and characterized using a polyphasic taxonomic approach. Cells of strain H-5 were Gram-stain-negative, aerobic, motile by means of a single polar flagellum, rod-shaped, covered by large capsules and formed white colonies. Growth occurred at 15-30 °C (optimum, 25 °C), at pH 6-8 (optimum, pH 7) and with 0-0.

gen. nov., sp. nov., a new member of the family isolated from a freshwater mesocosm.

A bacterial strain designated FSY-15 was isolated from a freshwater mesocosm in Taiwan and characterised using a polyphasic taxonomic approach. Cells of strain FSY-15 were Gram-negative, aerobic, non-spore forming, non-motile rods and formed orange coloured colonies. Growth occurred at 20-30 °C (optimum, 25 °C), at pH 6-7.

Corn stover pretreatment by inorganic salts and its effects on hemicellulose and cellulose degradation.

Inorganic salts, NaCl, KCl, CaCl(2), MgCl(2), FeCl(2), FeSO(4), FeCl(3), and Fe(2)(SO(4))(3), were studied as catalysts for the degradation of hemicellulose in corn stover. FeCl(3) significantly increased the hemicellulose degradation in aqueous solutions heated between 140 and 200 degrees C with high xylose recovery and low cellulose removal, amounting to approximately 90% and <10%, respectively. Hemicellulose removal increased 11-fold when the corn stover was pretreated with 0.