Shakes, rockers, mixers, and stirrers are available for molecular and biological mixing applications, while peltier chiller or thermocyclers, which chill or heat samples, facilitate temperature-sensitive reactions. Homogenizers and liquid nitrogen cooler mortars blend, homogenize, or crush samples, while splash shields and fume hoods protect laboratory workers from injury and provide proper ventilation. Vacuum desiccators protect and preserve moisture-sensitive and hygroscopic materials.