aerobic and anaerobic respiration in bacteria pdf

Aerobic And Anaerobic Respiration In Bacteria Pdf

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Anaerobic respiration is respiration using electron acceptors other than molecular oxygen O 2. Although oxygen is not the final electron acceptor, the process still uses a respiratory electron transport chain.

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Anaerobic respiration

Basically, anaerobes are organisms that do not require energy oxygen for metabolism. As such, they are different from other types of organisms aerobes that need oxygen for their energy needs. Compared to aerobes that need oxygen to grow, anaerobes are capable of using various other substances during metabolism. Examples of anaerobic organisms include:.

Like other anaerobic organisms, anaerobic bacteria do not require oxygen for respiration. Rather various organic and even inorganic materials may be used as electron acceptors during this process. Here, it's worth noting that some of the anaerobes can tolerate oxygen and even use it for respiration. For others, however, oxygen cannot be tolerated and is even poisonous to the bacteria. Here are the major classifications of anaerobic bacteria:. Based on metabolic characteristics, anaerobic bacteria are divided into the following groups:.

Aerobically different bacteria behave differently when grown in liquid culture:. Bacteria described as facultative anaerobes grow well in oxygen but can also continue growing in its absence.

Although they particularly thrive in the presence of oxygen, these anaerobes can also use such processes as fermentation to continue growing when oxygen is not available. Therefore, facultative anaerobes may be described as having the following three main characteristics:. They can either grow aerobically or anaerobically. Because of their ability to respire and ferment organic substances, these types of bacteria facultative anaerobes , can continue growing in the presence or the absence of oxygen.

For some of these organisms, particularly those that rely on oxygen for some of the biosynthetic reactions, growing is significantly affected in the absence of oxygen. Metabolism refers to a set of chemical reactions that convert food material into energy. For facultative anaerobes, respiration pathways shift depending on the presence or absence of oxygen. The following are the steps for the two processes:. For both aerobic respiration and fermentation of facultative anaerobic bacteria like lactobacillus, glycolysis breakdown of glucose to produce 2 Pyruvate is the first step of metabolism.

In the presence of oxygen:. Anaerobic respiration goes through two more phases that include the tricarboxylic acid cycle TCA and the electron transport chain. Pyruvate, which still contains high amounts of chemical energy, is then acted upon by enzyme pyruvate dehydrogenase to produce acetyl-CoA acetyl-coenzyme A. Here, each of the pyruvate molecules is broken down to release four of these molecules. NADH plays an important role as a reducing agent in that it operates as the electron donor to oxygen, which acts as the terminal electron acceptor.

In the process, oxygen is reduced to water. In the end, the process of complete breakdown of glucose in aerobic respiration results in the production of 36 molecules of ATP for each unit of glucose. In the absence of oxygen:. In the absence of oxygen, bacteria like E. Here, NADH donates electrons to these compounds given that oxygen as an electron acceptor is absent. However, due to the fact that these electron acceptors have less affinity for electrons as compared to oxygen, less amount of energy is produced during anaerobic respiration.

In some cases, the aforementioned alternatives nitrate, sulfate, sulfur and fumarate and oxygen are altogether absent. For this reason, facultative anaerobes like lactobacillus use fermentation as a means of energy production. Following glycolysis, which breaks down the sugar into pyruvate, the molecules of pyruvate produced may be further broken down by given enzymes resulting in the production of given products.

The presence of lactate dehydrogenase may result in the production of lactate while the presence of pyruvate formate lyase may break down pyruvate to formate. As well, pyruvate dehydrogenase breaks down pyruvate to acetyl-CoA. These products are then further broken down by given enzymatic action depending on the organism. Acetyl-CoA is further broken down to acetate by phosphate acetyl-transferase or may end up being broken down to ethanol by alcohol dehydrogenase and acetaldehyde dehydrogenase.

Further enzyme action produces succinate which is further converted to acids and end up being removed from the cell as waste. While ethanol is directly excreted, formate is broken down to carbon dioxide and hydrogen that have to be removed from the cell. Although the fermentation process produces energy, the amount of energy is significantly less compared to the amount produced during aerobic respiration.

Fermentation may be presented as:. Apart from this characteristic ability to grow aerobically and anaerobically , facultative anaerobes have the following two characteristics:.

Unlike facultative anaerobes, obligates live in environments that do not have oxygen. As such, they cannot survive in the presence of oxygen due to oxygen toxicity. For this reason, obligate anaerobes depend on a variety of other substances as terminal electron acceptors. Some of the bacteria classified as obligate anaerobes include:.

Although obligate anaerobes live in environments devoid of oxygen mud or animal gut etc some can tolerate very little concentration of oxygen between 0. When exposed to higher concentrations, some of these bacteria form endospores that are able to survive through such extreme conditions. Some of the other characteristics of obligate anaerobes include:. Metabolism in obligate anaerobes may, therefore, be represented as follows:.

Although they can tolerate the presence of oxygen, aerotolerant anaerobes cannot grow or carry out metabolism processes in its presence. Using fermentation, these bacteria are able to meet their energy requirement. Examples of aerotolerant bacteria include:.

Characteristics of aerotolerant bacteria include:. Here's more on Bacteria Size, Shape and Arrangement. Return to Unicellular Organisms. Return to Bacteria main page. Return from learning about Anaerobes to MicroscopeMaster Home. Hiroko E. Kikuchi and Takeshi Suzuki. Applied And Environmental Microbiology, Oct. Dr Alvin Fox. Bacteriology - Chapter Three.

Nutrition, Growth And Energy Metabolism. Thomas Finn. Understanding bacterial adaptation to aerobic and anaerobic environments through experimental evolution and whole genome analysis. Amazon and the Amazon logo are trademarks of Amazon. Scientific understanding changes over time.

MicroscopeMaster is not liable for your results or any personal issues resulting from performing the experiment. The MicroscopeMaster website is for educational purposes only. Images are used with permission as required. Feb 12, 21 PM. Rickettsia bacteria is a genus that consists of small, obligate intracellular parasites of human beings, animals, and plants.

Read more here. Read More. Feb 09, 21 PM. Feb 05, 21 PM. Endosomes are membrane-bound vesicles that are involved in the transportation and sorting of internalized material. Aerobically different bacteria behave differently when grown in liquid culture by Pixie [Own Work:Public domain], Wikipedia commons. Cultured Clostridium Perfringens by Author: Dr. Stuart E. Comments Have your say about what you just read on MicroscopeMaster!

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NCBI Bookshelf. Baron S, editor. Medical Microbiology. Heterotrophic metabolism is the biologic oxidation of organic compounds, such as glucose, to yield ATP and simpler organic or inorganic compounds, which are needed by the bacterial cell for biosynthetic or assimilatory reactions. Respiration is a type of heterotrophic metabolism that uses oxygen and in which 38 moles of ATP are derived from the oxidation of 1 mole of glucose, yielding , cal. An additional , cal is lost as heat.

Energetics of aerobic and anaerobic bacteria

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Some prokaryotes are able to carry out anaerobic respiration, respiration in which an inorganic molecule other than oxygen O 2 is the final electron acceptor. For example, some bacteria called sulfate reducers can transfer electrons to sulfate SO 4 2- reducing it to H 2 S. Other bacteria, called nitrate reducers, can transfer electrons to nitrate NO 3 - reducing it to nitrite NO 2 -. Other nitrate reducers can reduce nitrate even further to nitrous oxide NO or nitrogen gas N 2.

5.9A: Electron Donors and Acceptors in Anaerobic Respiration

18.4: Anaerobic Respiration

Basically, anaerobes are organisms that do not require energy oxygen for metabolism. As such, they are different from other types of organisms aerobes that need oxygen for their energy needs. Compared to aerobes that need oxygen to grow, anaerobes are capable of using various other substances during metabolism. Examples of anaerobic organisms include:.

Bioenergetics pp Cite as. Microorganisms play a pivotal role in the cycle of matter on our planet. Their importance lies in the decomposition of the organic material that was originally produced by the activity of photosynthetic autotrophs. Unable to display preview. Download preview PDF. Skip to main content. This service is more advanced with JavaScript available.

The contribution of genes required for anaerobic respiration to the virulence of Salmonella enterica serovar Gallinarum for chickens. Paiva I ; R. Penha Filho I ; E. Pereira I ; M. Lemos I ; P.


In both types of bacteria the respiratory nitrate reductase is located in the plasma membrane and is linked to the consti- tutive, aerobic respiratory chain in the.


Key Points

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Правда открылась со всей очевидностью: Хейл столкнул Чатрукьяна. Нетвердой походкой Сьюзан подошла к главному выходу- двери, через которую она вошла сюда несколько часов. Отчаянное нажатие на кнопки неосвещенной панели ничего не дало: массивная дверь не поддалась. Они в ловушке, шифровалка превратилась в узилище. Купол здания, похожий на спутник, находился в ста девяти ярдах от основного здания АНБ, и попасть туда можно было только через главный вход. Поскольку в шифровалке имелось автономное энергоснабжение, на главный распределительный щит, наверное, даже не поступил сигнал, что здесь произошла авария.

Сьюзан вспомнила стандартную школьную таблицу. Четыре на шестнадцать. - Шестьдесят четыре, - сказала она равнодушно.  - Ну и. Дэвид приблизился поближе к камере.

 Премного благодарен, приятель! - крикнул тот ему вслед.  - Увидишь Меган, передавай от меня привет! - Но Беккер уже исчез. Двуцветный вздохнул и поплелся к танцующим. Он был слишком пьян, чтобы заметить идущего следом за ним человека в очках в тонкой металлической оправе.

Все люди на подиуме потянулись к терминалу в одно и то же мгновение, образовав единое сплетение вытянутых рук. Но Сьюзан, опередив всех, прикоснулась к клавиатуре и нажала цифру 3.

Она узнала этот запах, запах плавящегося кремния, запах смертельного яда. Отступив в кабинет Стратмора, Сьюзан почувствовала, что начинает терять сознание. В горле нестерпимо горело. Все вокруг светилось ярко-красными огнями.

Инструкция по ее изготовлению была проста, как рецепт приготовления жженого сахара. - Плутоний и уран, - повторял Джабба.  - Переходите к главному. - Вернитесь назад, - приказала Сьюзан.  - Документ слишком объемный.

Я был ослеплен своими амбициями. Стоя над Хейлом и стараясь унять дрожь, Сьюзан услышала приближающиеся шаги и медленно обернулась. В проломе стены возникла фигура Стратмора.

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5 Comments

  1. Andrew F.

    Some prokaryotes like bacteria and archaea perform this type of anaerobic respiration. Accepting electrons by.

    01.12.2020 at 10:46 Reply
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  4. Mariana A.

    In anaerobic respiration, a molecule other than oxygen is used as the terminal electron acceptor in the electron transport chain.

    04.12.2020 at 18:28 Reply
  5. Abigail S.

    Anaerobic digestion for waste treatment involves the breakdown of organic waste by a mixture of bacteria. It is commonly used as a treatment process for.

    05.12.2020 at 14:27 Reply

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