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Bacteria

Bacteria are a large domain of single-celled, prokaryote microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals.

2,228 Questions

What temperature does bacteria start to die at when frozen?

It actually depends on the kind of bacteria. Based on their temperature requirements (temperatures at which they grow) bacteria are classified as psychrophiles (very low temperatures... even below zero).. mesophiles (above zero to say 20-30 on an average...).. thermophiles (above 50).. extreme thermophiles (very extreme temperatures such as hot springs.. may be in hundreds...).

What is the difference between thermophiles and halophiles?

Thermophiles are microorganisms that thrive in high temperature environments, while halophiles are microorganisms that thrive in high-salt environments. Both types of extremophiles have adapted to survive in these extreme conditions by evolving specific metabolic and physiological strategies.

What is the optimum temperature of enzymes of thermophilic bacteria?

The optimum temperature for enzymes of thermophilic bacteria is typically around 70-80°C. These enzymes have evolved to function best at high temperatures, allowing the bacteria to thrive in extreme environments such as hot springs and deep-sea hydrothermal vents.

Does cyanobacteria have pseudopodia?

No, cyanobacteria do not have pseudopodia. Pseudopodia are temporary protrusions of the cell membrane used for movement in certain single-celled organisms like amoebas, while cyanobacteria move through gliding or floating.

Can men catch klebsiella?

Yes, men can catch klebsiella infections. Klebsiella is a type of bacteria that can cause various infections in people, regardless of gender. It is important to practice good hygiene and seek medical treatment if you suspect an infection.

What scientific tool would you use to look at something very small like bacteria?

You would use a microscope to look at something very small like bacteria. There are different types of microscopes, such as light microscopes and electron microscopes, that can magnify objects at the microscopic level.

What is the main source of staphylococcus bacteria?

The main source of Staphylococcus bacteria is typically human skin and nasal passages. It can also be found in the environment, on surfaces, and in contaminated food. Staphylococcus bacteria can easily spread through direct contact or through contaminated objects.

What are the factors affecting growth promotion test after media fill that could lead to failure of results for bacillus subtilus?

I am also looking for the answer to this.

One has to look at the entire system and all the possible influencing segments and then dissect each one to find a possible root cause analysis. The micro - tests should also be scrutinised for possibility of miss test result.

How well does bacteria spread?

Bacteria initiate infection by making use of virulence factors which are;

1. pilli: These are small hairs that enable some pathogens to attach easily to cell surfaces, particularly mucous membranes. bacteria possessing pilli include Neisseria gonorrheae and some strains of Escherichia coli, Salmonella and Shigella species

2. Production of enzymes that help pathogens to spread: for example, hyaluronidase produced by Clostridium perfringes and some Streptococci and Staphylococci,helps organisms to spread through the body by breaking down the hyaluronic acid of connective tissue.

3. production of beta-lactamases: These penicillin-destroying enzymes are produced by many bacteria including some strains of Staphylococcus aureus and Neisseria gonorrhoeae.

4. Mechanisms that interfere with phagocytosis: Bacteria such as Streptococcus pneumoniae, Klebsiella pneumoniae, Haemophilus influenzae, and Neisseria meningitidis secrete a capsule around their cell wall which helps to prevent opsonization and phagocytosis.

5. production of exotoxin: several gram positive and a few gram negative bacteria secrete powerful poisons called exotoxins that are capable of destroying or injuring host cells. They tend to be specific in their action, e.g. the exotoxin of Clostridium tetani is neurotoxin.

6. Release of endotoxin: The cell walls of Gram negative organisms contain endotoxin ( O antigen ). When endotoxin is released into the blood circulation, the resulting toxaemia may cause shock, rigor, chills.

7. Mechanisms that destroy or neutralize antibodies: For e.g., the destructive IgA protease of Pseudomonas aeruginosa.

What are non harmful bacterias called?

Non harmful bacteria are referred to as commensal bacteria. These bacteria coexist peacefully with the host organism and do not cause any harm or disease.

How much bacteria is on a fridge door handle?

The amount of bacteria on a fridge door handle can vary depending on factors like how often it is touched and cleaned. Studies have shown that high-touch surfaces like door handles can harbor a significant amount of bacteria, including potentially harmful ones. Regular cleaning and disinfecting of fridge door handles can help reduce the presence of bacteria.

How does your body kill pathogens that get inside us?

The body's immune system fights pathogens through multiple mechanisms. These can include engulfing and digesting pathogens (phagocytosis), producing antibodies to neutralize pathogens, releasing signaling molecules to recruit other immune cells, and triggering a process called apoptosis in infected cells to prevent the spread of the infection.

What do you call a person that is scared of germs and bacteria?

A person who is scared of germs and bacteria is often referred to as having mysophobia or germophobia. They may also be described as having an obsessive-compulsive disorder (OCD) related to cleanliness or hygiene.

Which human body part has the most bacteria?

The human gut contains the highest concentration of bacteria, with trillions of microbes living in the intestines. This collection of bacteria forms the gut microbiome, which plays a crucial role in digestion, metabolism, and immune function.

Is a amoeba an anaerobe?

No, amoebas are not anaerobes. They are able to survive in oxygen-rich environments and require oxygen for their metabolic activities. Anaerobes, on the other hand, do not require oxygen and can survive in oxygen-deprived environments.

What is the function of virus head?

The virus head is responsible for protecting and encapsulating the genetic material of the virus, such as DNA or RNA. It helps the virus attach to host cells and inject its genetic material to initiate the infection process. The head also plays a role in facilitating the release of the genetic material into the host cell for replication.

How bacteria is measured?

Bacteria can be measured using different methods such as counting the number of bacteria cells using a microscope, plating the bacteria on agar plates and counting colony forming units (CFUs), or using molecular techniques like qPCR to quantify the amount of bacterial DNA present in a sample. The unit of measurement for bacteria is typically expressed in colony forming units per milliliter (CFU/ml) or in terms of bacterial cell counts.

Which tool led to the discovery of bacteria and other tiny things living in water?

The microscope led to the discovery of bacteria and other microorganisms living in water. Antonie van Leeuwenhoek, a Dutch scientist, is credited with being the first to observe and describe these tiny creatures using a simple microscope he developed in the 17th century.

How do you keep bacteria cells alive?

The bacteria needs a host so if its not in your body it is not going to live but you could examine your own blood but you'd need certain equipment

Same as living organism: it needs the right food and environment.

Which is more effective in reducing organic carbon load in sewers. aerobic or anaerobic bacteria?

Aerobic bacteria are more effective in reducing organic carbon load in sewers compared to anaerobic bacteria. Aerobic bacteria require oxygen to break down organic matter, leading to more efficient degradation of organic materials. Anaerobic bacteria are slower and produce byproducts such as sulfides and odorous compounds.

What structures are built by cyanobacteria?

Cyanobacteria can form structures called stromatolites, which are layered formations of sediment and trapped microorganisms. They also build specialized cells called heterocysts to fix nitrogen in environments with low nitrogen levels. Additionally, cyanobacteria can create sheaths and filaments to protect themselves and aid in nutrient absorption.

What is anaerobic respiration in bacteria?

Anaerobic respiration a form of respiration using electron acceptors other than oxygen. Many anaerobic organisms can respire only using anaerobic compounds and will die in the presence of oxygen.

What effect may bacterial contamination have on urine pH?

Bacterial contamination will cause no effects if the sample is tested directly after collection. However, if the sample is allowed to sit, bacteria will multiply and raise the urine pH. Urine pH above 8 is abnormal.