Aerobic bacteria live in normal air containing 21% oxygen. However, when aerobic bacteria is engulfed in clusters of oxygen composed of 100% pure oxygen and is continually bombarded with electron shots, it quickly dies. Most bacteria thrive at 40 to 140 degrees Fahrenheit, which is why it's important to keep food refrigerated or cook it at high temperatures. Freezing temperatures don't kill germs, but it makes them dormant until they are thawed. Normal temperatures in the permafrost are about 5 degrees F, but in lab tests, Planococcus halocryophilus was able to continue thriving at temperatures well below zero. It is the coldest environment where bacterial life has ever been discovered. Psychrophilic bacteria are defined as cold-loving bacteria. Specifically, their cardinal temperatures are 20°C for maximal growth, 15°C or lower for optimal growth, and 0°C or lower for minimum growth.

Psychrophiles are extremophilic bacteria or archaea which are cold-loving having an optimal temperature for growth at about 15°C or lower, a maximal temperature for growth at about 20°C and a minimal temperature for growth at 0°C or lower. While it's true that bacteria stop multiplying below 32°F (0°C), they do not die. If you put a bacteria laden piece of food in the freezer, it'll be the same bacteria laden piece of food when you take it out to thaw. Normal temperatures in the permafrost are about 5 degrees F, but in lab tests, Planococcus halocryophilus was able to continue thriving at temperatures well below zero. It is the coldest environment where bacterial life has ever been discovered. Normal temperatures in the permafrost are about 5 degrees F, but in lab tests, Planococcus halocryophilus was able to continue thriving at temperatures well below zero. It is the coldest environment where bacterial life has ever been discovered. Generally, the colder the temperature the slower bacteria will grow, but cold temperatures don't always stop bacteria growing altogether. Here are a few useful things to remember: keep it between 0°C and 5°C. Wait for food to cool down before you put it in the fridge. Microbes, too, are found in snow and ice. Many different species have specially adapted to survive in the cold. Bacteria genera found in both air samples and the Antarctic include Staphylococcus, Bacillus, Corynebacterium, Micrococcus, Streptococcus, Neisseria, and Pseudomonas. Bacteria were also found living in the cold and dark in a lake buried a half-mile deep. First off, no organism, bacteria or otherwise, can survive in a pure oxygen environment. Aerobic bacteria live in normal air containing 21% oxygen. However, when aerobic bacteria is engulfed in clusters of oxygen composed of 100% pure oxygen and is continually bombarded with electron shots, it quickly dies. They require a minimum level of oxygen for growth, about 1%–10%, well below the 21% found in the atmosphere. Examples of obligate aerobes are Mycobacterium tuberculosis, the causative agent of tuberculosis and Micrococcus luteus, a gram-positive bacterium that colonizes the skin.

Bacteria multiply rapidly between 40 and 140 degrees. Bacteria will not multiply but may start to die between 140 and 165 degrees. Bacteria will die at temperatures above 212 degrees. 2.3: How to Take Food Temperatures Know how to get an accurate reading with your thermometer. These microbes are called psychrophiles, which means “cold-loving” in Greek. Psychrophiles are largely bacteria but can also include other microbes. Microbes cannot survive in solid ice. Psychrophiles grow best in the temperature range of 0–15 °Cwhereas psychrotrophs thrive between 4°C and 25 °C. Mesophiles grow best at moderate temperatures in the range of 20 °C to about 45 °C. Pathogens are usually mesophiles. Thermophiles and hyperthemophiles are adapted to life at temperatures above 50 °C. According to the World Health Organization (WHO), cold air and snow do not kill germs, bacteria, or viruses. Most germs will stay dormant in freezing temperatures. The flu virus can be more cold-resistance and can thrive in cold weather during the winter. Cold temperatures cannot kill germs, but only slow down their growth. Therefore, bacteria in cold temperatures will not be able to function, but if they are brought back to room temperature, they will start to multiply. First off, no organism, bacteria or otherwise, can survive in a pure oxygen environment. Aerobic bacteria live in normal air containing 21% oxygen. However, when aerobic bacteria is engulfed in clusters of oxygen composed of 100% pure oxygen and is continually bombarded with electron shots, it quickly dies. Aerobic bacteria live in normal air containing 21% oxygen. However, when aerobic bacteria is engulfed in clusters of oxygen composed of 100% pure oxygen and is continually bombarded with electron shots, it quickly dies. The oxygen level has to be just right for growth, not too much and not too little. These microaerophiles are bacteria that require a minimum level of oxygen for growth, about 1%–10%, well below the 21% found in the atmosphere.