Computer algorithm for selection of frequency relays for load shedding

Microcystin-LR (MC-LR), one of the most prevalent cyanobacterial toxins in freshwater environments, has raised increasing concern because of its potential health risks asso-ciated with long-term exposure through contaminated drinking water and food, as well as inhalation of bloom-derived aerosols. Although intestinal toxicity has emerged as an important consequence of MC-LR exposure, the mechanisms underlying chronic colorectal inflammation remain incompletely understood. In the present study, mice were continuously exposed to MC-LR at 0, 1, 60, or 120 μg/L through drinking water for 15 months to investigate the effects of prolonged exposure on colorectal injury, inflammatory responses, macrophage infiltration, and glycolytic metabolism. Chronic MC-LR exposure did not significantly alter body weight or water consumption, whereas exposure to 60 and 120 μg/L MC-LR significantly shortened colon length. Histopathological examination revealed pronounced colorectal mucosal injury in the 60 and 120 μg/L groups, characterized by mucosal epithelial cell shedding, inflammatory cell infiltration, and disorganization of the crypt architecture. Consistently, MC-LR exposure markedly increased the expression of the pro-inflammatory cytokines