Lht

LHT is an acronym that can refer to Life History Theory, a framework in evolutionary biology and psychology that explains how organisms allocate limited energy to growth, maintenance, and reproduction. The theory emphasizes trade-offs among traits such as maturation rate, age at first reproduction, number and size of offspring, and lifespan. Life history strategies are thought to be shaped by environmental factors including resource availability, predation, and mortality risk. In humans and other species, researchers use LHT to interpret variations in behavior, development, and aging, linking early-life conditions with later-life outcomes. Critics caution that some applications can overgeneralize complex traits and that measurements of life-history variables can be context-dependent.

Another use of the acronym is Lysine Histidine Transporter (LHT), a family of amino acid transport proteins in plants. LHT transporters, such as LHT1, mediate uptake and translocation of neutral and acidic amino acids across membranes, often functioning as proton-coupled symporters. They contribute to nutrient acquisition from soil, amino acid transport between tissues, and responses to nitrogen status and environmental stress. Research on LHT proteins informs plant nutrition, growth, and interactions with symbiotic organisms.