Sea surface salinity (SSS) plays an important role in global water cycle. In recent years, satellite based remote sensing has proven to be a promising approach for global SSS observation. A new payload concept, named MICAP (microwave imager combined active and passive), has been introduced in this paper. MICAP is a suit of active/passive instrument package, which includes L/C/K band one-dimensional MIR (microwave interferometric radiometer) and L-band DBF (digital beamforming) scatterometer, sharing a parabolic cylinder reflector. MICAP has been selected to be a candidate payload for future Chinese ocean salinity mission. In this paper, the MICAP instrument concept, specification and preliminary system design will be introduced.

Saxitoxin (STX) is a typical toxic guanidinium neurotoxin, one of the paralytic shellfish poisons (PSP), which poses a serious threat to human health. In this paper, a simple and sensitive SERS aptamer sensor (abbreviated as AuNP@4-NTP@SiO₂) for the quantitative determination of STX was developed. Hairpin aptamers of saxitoxin are modified on magnetic beads and used as recognition elements. In the presence of STX, DNA ligase, and the rolling circle template (T1), a rolling circle amplification reaction was triggered to produce long single-stranded DNA containing repetitive sequences. The sequence can be hybridized with the SERS probe to realize the rapid detection of STX. Due to the inherent merits of its components, the obtained AuNP@4-NTP@SiO₂ SERS aptamer sensor manifests excellent sensing performance for STX detection with a wide linear range from 2.0 × 10⁻¹⁰ mol L⁻¹ to 5.0 × 10⁻⁴ mol L⁻¹ and a lower detection limit of 1.2 × 10⁻¹¹ mol L⁻¹. This SERS sensor can provide a strategy for the micro-detection of other biological toxins by changing the aptamer sequence.

A novel VS₄@N-BPC platform was constructed, and demonstrated a high electrochemical response to xanthine due to the excellent synergistic effect.

A novel CeO₂@S-SC material was constructed, which demonstrated a strong electrochemical response to uric acid due to the excellent synergistic effect.