In higher plants, mature male gametophytes have distinct apertures. After pollination, pollen grains germinate, and a pollen tube grows from the aperture to deliver sperm cells to the embryo sac, completing fertilization. In rice, the pollen aperture has a single-pore structure with a collar-like annulus and a plug-like operculum.
View Article and Find Full Text PDFThis paper aimed at explore international ocean governance issues through the perspective of Japan's nuclear contaminated water discharge to the sea. This paper analyzes the core issue of Japan's plan to discharge nuclear contaminated water into the ocean from the perspectives of Japan's international legal obligation, law enforcement issues, and judicial issues after integrated analyzing academic research paper and cases. Japan has obligations such as timely notification, information disclosure, environmental impact assessment, and avoidance of transboundary harm.
View Article and Find Full Text PDFMeiosis plays an essential role in the production of male and female gametes. Extensive studies have elucidated that homologous chromosome association and pairing are essential for crossing-over and recombination of chromosomal segments. However, the molecular mechanism of chromosome recognition and pairing remains elusive.
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