Obligate aerobes need oxygen ...
Published by Prem Baboo, Researcher at www.researchGate.net
Obligate aerobes need oxygen to grow. In a process known as cellular respiration, these organisms use oxygen to oxidize substrates (for example sugars and fats) and generate energy. Facultative anaerobes use oxygen if it is available, but also have anaerobic methods of energy production. An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. It may react negatively or even die if oxygen is present. (In contrast, an aerobic organism (aerobe) is an organism that can survive and grow in an oxygenated environment.)
- Anaerobic bacteria do not grow on solid media in room air (0.04% carbon dioxide and 21% oxygen).
- Facultative anaerobic bacteria can grow in the presence as well as in the absence of air.
- Microaerophilic bacteria do not grow at all aerobically or grow poorly, but grow better under 10% carbon dioxide or anaerobically.
- Anaerobic bacteria can be divided into strict anaerobes that can not grow in the presence of more than 0.5% oxygen and moderate anaerobic bacteria that are able of growing between 2 to 8% oxygen.
- Anaerobic bacteria usually do not possess catalase, but some can generate superoxide dismutase which protects them from oxygen.
- The clinically important anaerobes in decreasing frequency are:
- 1. Six genera of Gram-negative rods (Bacteroides, Prevotella, Porphyromonas, Fusobacterium, Bilophila and Sutterella spp.);
- 2. Gram-positive cocci (primarily Peptostreptococcus spp.);
- 3. Gram-positive spore-forming (Clostridium spp.) and nonspore-forming bacilli (Actinomyces, Propionibacterium, Eubacterium, Lactobacillus and Bi?dobacterium spp.); and
- 4. Gram-negative cocci (mainly Veillonella spp.) .
- Because of their fastidious nature, anaerobes are hard to isolate and are often not recovered from infected sites.
Enhancement was studied by measuring the relative increase in CFU of the two bacterial components inducing subcutaneous abscesses in mice. It is apparent that the growth rate of facultative and aerobic bacteria is enhanced much more in mixed infections with Bacteroides spp. than that of their anaerobic counterparts. Hypoxia offers the potential for anaerobic bacteria colonization and tumor destruction by the bacteria , and dormant spores of wild-type Clostridium perfringens (Cp) germinate and proliferate within the hypoxic cores of pancreatic tumors in mice.
1 Comment
Bonjour
Votre définition ne veut rien dire autre que venir renforcer vos dires.
Maintenant dites moi comment un micro organisme -aérobie- se métamorphose quand il est vient d'un milieu aérobie, qu'il vit dans un milieu aérobie?
Comment s'instaure un milieu sans oxygène cerné de partout par un état aérobie?
Comment se maintien un état sans oxygène quand il est entouré d'un milieu aérobie?
Quand on établit une théorie on peut lui apporter toutes les théories possibles voir même à l'infini.
Ceux qui prônent cette théorie oublient toujours que la nature fonctionne dans le temps et doucement.
Il se passe automatiquement des changements lors de certaines variations d'un état qui vont engendrer des effets. Il faut déjà que la nature stabilise ce genre de modifications ce qui ne peut se faire que dans le temps.
Hors dans votre description le temps est absent.
le sans oxygène est une théorie qui tient au fait qu'à l'époque les scientifiques n'arrivaient pas à définir ce qui se passait réellement quand un milieu partait en putréfaction.
Comme beaucoup de théories celle ci manquait de connaissance tel que la pression atmosphérique qui vient mettre à mal votre théorie.
D'ailleurs les défenseurs de cet état vous disent tous que cela se trouve dans des endroits inncaccessibles, improuvables.
Une simple théorie dont on peut extrapoler à l'infini lointain
Je l'explique dans ma communication scientifique
Hello your definition means nothing other that to reinforce your story.
Now tell me how a micro-organism - aerobic - transforms when it is just an aerobic environment, he lives in an aerobic environment?
How builds an environment without oxygen surrounded everywhere by an aerobic State?
How to maintain a State without oxygen when it is surrounded by an aerobic environment?
When a theory is established we can provide all the possible assumptions even to infinity.
Those who advocate this theory always forget that nature works in time and take it easy.
Happens automatically changes when some variations of a State who will cause effects. They have nature to stabilize such changes which cannot be done in time.
Off time is absent in your description.
the without oxygen is a theory that is due to the fact that at the time scientists were unable to define what was actually happening when a middle left rotting.
Like many theories this one lacked knowledge such as atmospheric pressure coming to bring down your theory.
Also defenders of this State to tell you all that this is in places inncaccessibles, improuvables.
A simple theory which we can extrapolate to distant infinity
I explain in my scientific communication