The following is a list of the "B" codes for MeSH

Mesh

Mesh consists of semi-permeable barrier made of connected strands of metal, fiber, or other flexible/ductile material. Mesh is similar to web or net in that it has many attached or woven strands.-Types of mesh:...

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United States National Library of Medicine

The United States National Library of Medicine , operated by the United States federal government, is the world's largest medical library. Located in Bethesda, Maryland, the NLM is a division of the National Institutes of Health...

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Source for content is here. (File "2006 MeSH Trees".)

--- desulfurococcales

Desulfurococcales

In taxonomy, the Desulfurococcales are an order of the Thermoprotei.-External links:...

--- desulfurococcaceae

Desulfurococcaceae

In taxonomy, the Desulfurococcaceae are a family of the disc-shaped anaerobic microorganisms belonging to the order Desulfurococcales, in the domain Archaea. Members of this family are distinguished from the other family in the order Desulfurococcales by having an optimal growth temperature below...

 --- aeropyrum

Aeropyrum

In taxonomy, Aeropyrum is a genus of the Desulfurococcaceae.-Etymology:The name Aeropyrum derives from:Greek noun aer, aeros , air; Greek neuter gender noun pur, fire; New Latin neuter gender noun Aeropyrum, air fire, referring to the hyperthermophilic respirative character of the...

 --- pyrodictiaceae

Pyrodictiaceae

The Pyrodictiaceae are a family of disc-shaped anaerobic microorganisms belonging to the order Desulfurococcales, in the domain Archaea. Members of this family are distinguished from the other family in the order Desulfurococcales by having an optimal growth temperature above 100 degrees °C,...

--- sulfolobales

Sulfolobales

In taxonomy, the Sulfolobales are an order of the Thermoprotei.- External links :...

--- sulfolobaceae

Sulfolobaceae

In taxonomy, the Sulfolobaceae are a family of the Sulfolobales.-External links:...

 --- acidianus

Acidianus

In taxonomy, Acidianus is a genus of the Sulfolobaceae.-External links:...

 --- sulfolobus

Sulfolobus

Sulfolobus is a genus of microorganism in the family Sulfolobaceae. It belongs to the archea domain.Sulfolobus species grow in volcanic springs with optimal growth occurring at pH 2-3 and temperatures of 75-80 °C, making them acidophiles and thermophiles respectively...

 --- sulfolobus acidocaldarius --- sulfolobus solfataricus

--- thermoproteales

Thermoproteales

In taxonomy, the Thermoproteales are an order of the Thermoprotei.-External links:...

--- thermofilaceae

Thermofilaceae

In taxonomy, the Thermofilaceae are a family of the Thermoproteales.-External links:...

 --- thermoproteaceae

Thermoproteaceae

In taxonomy, the Thermoproteaceae are a family of the Thermoproteales.-External links:...

 --- pyrobaculum

Pyrobaculum

In taxonomy, Pyrobaculum is a genus of the Thermoproteaceae.- Description and Significance :As its latin name, Pyrobaculum suggests, the archaeon is rod-shaped and isolated from locations with high temperatures. It is Gram-negative and its cells are surrounded by an S-layer of protein subunits.P...

 --- thermoproteus

Thermoproteus

In taxonomy, Thermoproteus is a genus of the Thermoproteaceae.These prokaryotes are thermophilic sulphur-dependent organisms related to the genera Sulfolobus, Pyrodictium and Desulfurococcus...

--- archaeoglobales

Archaeoglobales

In taxonomy, the Archaeoglobales are an order of the Archaeoglobi.-External links:...

--- archaeoglobus

Archaeoglobus

Archaeoglobus is a genus of the phylum Euryarchaeota. Archaeoglobus can be found in high-temperature oil fields where they may contribute to oil field souring.- Metabolism :...

 --- archaeoglobus fulgidus

--- halobacteriales

Halobacteriales

In taxonomy, the Halobacteriales are an order of the Halobacteria, found in water saturated or nearly saturated with salt. They are also called halophiles, though this name is also used for other organisms which live in somewhat less concentrated salt water. They are common in most environments...

--- halobacteriaceae

Halobacteriaceae

In taxonomy, the Halobacteriaceae are a family of the Halobacteriales in the domain Archaea.- Overview :Halobacteriaceae are found in water saturated or nearly saturated with salt. They are also called halophiles, though this name is also used for other organisms which live in somewhat less...

 --- haloarcula

Haloarcula

In taxonomy, Haloarcula is a genus of the Halobacteriaceae.- Description and Significance :Haloarcula are extreme halophilic archaeons. They are distinguished from other genera in the Halobacteriaceae family by the presence of specific derivatives of TGD-2 polar lipids...

 --- haloarcula marismortui --- halobacterium

Halobacterium

In taxonomy, Halobacterium is a genus of the Halobacteriaceae.The genus Halobacterium consists of several species of archaea with an aerobic metabolism which require an environment with a high concentration of salt; many of their proteins will not function in low-salt environments. They grow on...

 --- halobacterium salinarum

Halobacterium salinarum

Halobacterium salinarum is an extremely halophilic marine gram-negative obligate aerobic archaeon. Despite its name, this microorganism is not a bacterium, but rather a member of the Kingdom Archaea. It is found in salted fish, hides, hypersaline lakes, and salterns...

 --- halococcus

Halococcus

Halococcus is a genus of the Halobacteriaceae.- Description and Significance :Halococcus is a genus of extreme halophilic archaea, meaning that they require high salt levels, sometimes as high as 32% NaCl, for optimal growth...

 --- haloferax

Haloferax

In taxonomy, Haloferax is a genus of the Halobacteriaceae.- Description and Significance :Haloferax volcanii is a species of halophile which exists in extreme saline environments. Recently an isolate of this species was studied by researchers at University of California-Berkeley as part of a...

 --- haloferax mediterranei --- haloferax volcanii --- natronobacterium

Natronobacterium

In taxonomy, Natronobacterium is a genus of the Halobacteriaceae. A member of the domain Archaea, it is both an extreme halophile and alkaliphile, thriving at an optimum saline concentration of 20% and optimum pH of 10.-Scientific books:...

 --- natronococcus

Natronococcus

In taxonomy, Natronococcus is a genus of the Halobacteriaceae.- Description and significance :This haloalkaliphilic archaeon is in the same family as microorganisms like Halobacterium...

--- methanobacteriales

Methanobacteriales

In taxonomy, the Methanobacteriales are an order of the Methanobacteria.- External links :...

--- methanobacteriaceae

Methanobacteriaceae

In taxonomy, the Methanobacteriaceae are a family of the Methanobacteriales.-External links:...

 --- methanobacterium

Methanobacterium

In taxonomy, Methanobacterium is a genus of the Methanobacteriaceae.- External links :...

 --- methanobrevibacter

Methanobrevibacter

In taxonomy, Methanobrevibacter is a genus of the Methanobacteriaceae.-External links:...

--- methanococcales

Methanococcales

In taxonomy, the Methanococcales are an order of the Methanococci.-External links:...

--- methanococcaceae

Methanococcaceae

In taxonomy, the Methanococcaceae are a family of the Methanococcales.-External links:...

 --- methanococcus

Methanococcus

In taxonomy, Methanococcus is a genus of the Methanococcaceae.Methanococcus is a genus of coccoid methanogens. They are all mesophiles, except the thermophilic M. thermolithotrophicus and the hyperthermophilic M. jannaschii...

--- methanomicrobiales

Methanomicrobiales

In the taxonomy of microorganisms, the Methanomicrobiales are an order of the Methanomicrobia. Methanomicrobiales are strictly carbon dioxide reducing methanogens, using hydrogen or formate as the reducing agent.-External links:...

--- methanomicrobiaceae

Methanomicrobiaceae

In taxonomy, the Methanomicrobiaceae are a family of the Methanomicrobiales.-External links:...

 --- methanospirillum

Methanospirillum

In taxonomy, Methanospirillum is a genus of the Methanospirillaceae.-External links:...

--- methanosarcinales

Methanosarcinales

In taxonomy, the Methanosarcinales are an order of the Methanomicrobia.-External links:...

--- methanosarcinaceae

Methanosarcinaceae

In taxonomy, the Methanosarcinaceae are a family of the Methanosarcinales.-External links:...

 --- methanosarcina

Methanosarcina

Methanosarcina are the only known anaerobic methanogens to produce methane using all three known metabolic pathways for methanogenesis. Most methanogens make methane from carbon dioxide and hydrogen gas. Some others utilize acetate in the acetoclastic pathway...

 --- methanosarcina barkeri

--- thermococcales

Thermococcales

In taxonomy, the Thermococcales are an order of the Thermococci.-External links:...

--- thermococcaceae

Thermococcaceae

In taxonomy, the Thermococcaceae are a family of the Thermococcales.- External links :...

 --- pyrococcus

Pyrococcus

In taxonomy, Pyrococcus is a genus of the Thermococcaceae.- Description and significance :Pyrococcus has similar characteristics of other archaea such as Archaeoglobus, Thermoautotrophican, and Methanococcus in the respect that they are all thermophilic and anaerobic...

 --- pyrococcus abyssi --- pyrococcus furiosus

Pyrococcus furiosus

Pyrococcus furiosus is an extremophilic species of Archaea. It can be classified as a hyperthermophile because it thrives best under extremely high temperatures—higher than those preferred of a thermophile...

 --- pyrococcus horikoshii --- thermococcus

Thermococcus

In taxonomy, Thermococcus is a genus of extreme thermophiles in the family the Thermococcaceae.They consist of gram-negative spheres that move with flagella. They are organothrophic anaerobes, growing in temperatures above 70°C...