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Plant and Soil
Plant and Soil

... Many N2-fixing organisms can turn off nitrogenase activity in the presence of N H ] and turn it on again when the N H 4 is exhausted. One of the most interesting systems for accomplishing this is by covalent modification of one subunit of dinitrogenase reductase by dinitrogenase reductase ADP-ribosy ...
AP Biology Exam
AP Biology Exam

... d. Excite groups of muscles uncontrollably e. None of the above 16. Which of the following phyla does not have coelomates? a. Aschelminthes b. Annelida c. Arthropoda d. Mollusca e. None of the above 17. The Ames test is best used to detect ________________. a. Drug resistance b. Mutation c. Bacteria ...
Fungal denitrification and nitric oxide reductase cytochrome P450nor
Fungal denitrification and nitric oxide reductase cytochrome P450nor

... assimilatory nitrate-reducing system is ubiquitously distributed among plants and micro-organisms to provide the nitrogen atoms of nitrate as nutrition for life. Assimilatory and dissimilatory nitrate-reducing systems were previously thought to function independently of one another. Therefore, invol ...
CHEMISTRY OF p-ELEMENTS - Львівський національний
CHEMISTRY OF p-ELEMENTS - Львівський національний

... respiration. It takes part in all kinds of matter renewal. The reactions of oxygen with lipids, proteins and with glucose for the first time are the source of energy for living organisms. While oxygen (O2) is necessary for life, oxygen as ozone (O3) is highly toxic. On the other hand, ozone is an im ...
Nutritional Requirements of Streptococcus salivarius
Nutritional Requirements of Streptococcus salivarius

... 196I). Unlike S. bovis, S. salivarius could not utilize thioglycollic acid, thiourea, thiouracil and sulphide. Both organisms failed to utilize methionine, sulphate and sulphite. It is not known how streptococci synthesize their sulphur-containing amino acids. An interesting question is how Streptoc ...
The Enzymes of Ammonia Assimilation and their
The Enzymes of Ammonia Assimilation and their

... The activities of GS, NADP-GOGAT and NADP-GDH in extracts of members of the ‘herbicola’, ‘carotovora’ and ‘amylovora’ clusters, grown with different sources of nitrogen, are shown in Table 1. NAD-GOGAT, NAD-GDH and corresponding amidotransferases and dehydrogenases (both NAD- and NADP-linked) able t ...
Honors Chemistry: Ch. 12 – Stoichiometry Some useful terms
Honors Chemistry: Ch. 12 – Stoichiometry Some useful terms

... 4.) Calculate the mass of silver needed to react with chlorine to produce 84 g of silver chloride (Hint: Write a balanced equation first). 5.) Calculate the number of liters of oxygen gas needed to produce 15.0 liters of dinitrogen trioxide. Assume all gases are at STP. 2N2(g) + 3O2(g)  2N2O3(g) 6. ...
Communication
Communication

... Oxidized low density lipoprotein (LDL) may be of central importance in triggering atherosclerosis. One potential pathway involves the production of nitric oxide (NO) by vascular wall endothelial cells and macrophages. NO reacts with superoxide to form peroxynitrite (ONOO2), a potent agent of LDL oxi ...
Amines and Amides
Amines and Amides

... 3-Hexanamine ...
BIOCHEMISTRY AND MOLECULAR BIOLOGY Problem Unit Seven
BIOCHEMISTRY AND MOLECULAR BIOLOGY Problem Unit Seven

... Module 1: Amino Acid Metabolism, I. Nitrogen Metabolism ...
Gel Electrophoresis and Amino Acid Analysis of the Nonprotein
Gel Electrophoresis and Amino Acid Analysis of the Nonprotein

... amino acids present, followed by proline, arginine, and alanine. These five amino acids contributed 70 mol% of the total free amino acids. Upon hydrolysis, there was a remarkable increase in glycine to 35 mol%, while aspartic and glutamic acids remained at about 20 mol%, the level found in the free ...
COMPOUNDS OF CARBON CONTAINING NITROGEN
COMPOUNDS OF CARBON CONTAINING NITROGEN

... oxygen atom as a part of the functional group. Now, you will learn about organic compounds containing nitrogen atom as a part of the functional group. An historical importance can be associated with these compounds as the first ever organic compound synthesised in the laboratory was urea which conta ...
Chapter 16: Amines and Amides
Chapter 16: Amines and Amides

... • Name the longest chain attached to the nitrogen. • Replace the final –e with –amine. • Number the chain so the carbon bonded to the nitrogen has the lowest possible number. • Number the other substituents on the carbon chain. • An italic “N” is used as a prefix for a substituent on nitrogen. • Exa ...
The Urea Cycle - Rose
The Urea Cycle - Rose

... The other four enzymes are part of the actual cycle. The cycle begins with the addition of carbamoyl phosphate to ornithine by ornithine transcarbamoylase to produce citrulline. Citrulline then leaves the mitochondria using a specific transporter, because the remaining reactions occur in the cytopla ...
Plant and Soil. 182:
Plant and Soil. 182:

... were impaired in growth on histidine and 7-aminobutyrate as sole carbon and nitrogen source. As the catabolism of these amino acids occurs predominantly through glutamate, our results indicate that mutants are also impaired in their ability to use histidine and 7-aminobutyrate as a nitrogen source. ...
File - cpprashanths Chemistry
File - cpprashanths Chemistry

... b) Medicines are more effective in colloidal state. c) Alum is added to purify muddy water a) Because the particle size is so small that no scattering of light is possible. 1M b) A colloidal state has a larger surface area. Thus medicines in colloidal state are effectively adsorbed and assimilated a ...
12 - einstein classes
12 - einstein classes

... The trihalides are predominantly covalent and, like NH3, have a tetrahedral structure with one position occupied by a lone pair. The exceptions are BiF3 which is ionic and the other halides of Bi and SbF3 which are intermediate in character. The trihalides typically hydrolyse readily with water, but ...
Nitrogenous Wastes
Nitrogenous Wastes

... OpenStax College This work is produced by OpenStax-CNX and licensed under the Creative Commons Attribution License 3.0† ...
NCERT Solution - Mywayteaching
NCERT Solution - Mywayteaching

... Lattice energy is directly proportional to the charge carried by an ion. When a metal combines with oxygen, the lattice energy of the oxide involving O2− ion is much more than the oxide involving O− ion. Hence, the oxide having O2− ions are more stable than oxides having O−. Hence, we can say that f ...
Sample pages 2 PDF
Sample pages 2 PDF

... Nitrogen fixation can be performed by rhizobia soil bacteria in symbiosis with legume plants. This process has been extensively studied, and the entire genome sequences of select Rhizobiaceae bacteria (such as Azorhizobium, Allorhizobium, Bradyrhizobium, Mesorhizobium, Rhizobium, and Sinorhizobium) ...
Nitrogen and Oxygen Family
Nitrogen and Oxygen Family

... Nitrogen differs from the rest of the members of this group due to its smaller size , high electronegativity, high ionisation enthalpy and non–availability of d orbitals. Nitrogen has unique ability to form p–p multiple bonds with itself and with other elements having small size and high electrone ...
In silico site of metabolism prediction for human UGT
In silico site of metabolism prediction for human UGT

... Overfitting often occurs when a model uses more terms than necessary (Hawkins, 2004). Because the degree of degeneracy of our defined descriptors can be high, models built using all of them could be easily overfitting. Therefore, it is important to select a subset of relevant and non-redundant featu ...
Dr. Murad`s Abstract
Dr. Murad`s Abstract

... blood pressure, increase blood flow to tissues, alter’ memory and behavior, decrease blood clotting, etc. The list of effects of nitric oxide that are independent of cyclic GMP formation is also growing at a rapid rate. For example, nitric oxide can interact with transition metals such as iron, thio ...
organonitrogen compounds i. amines
organonitrogen compounds i. amines

... The cleavage reaction of Equation 23-2 reveals other useful generalizations. Whatever its source, a parent molecular ion, M + , has one unpaired electron and is properly described as an odd-electron ion (a radical cation). When a parent molecular ion fragments, it does so hornolytically, as shown in ...
a-amino acid
a-amino acid

... possess nitrogenase • Nitrogenase reaction: ...
< 1 2 3 4 5 6 ... 14 >

Nitrogen

Nitrogen is a chemical element with symbol N and atomic number 7. It is the lightest pnictogen and at room temperature, it is a transparent, odorless diatomic gas. Nitrogen is a common element in the universe, estimated at about seventh in total abundance in the Milky Way and the Solar System. On Earth, the element forms about 78% of Earth's atmosphere and as such is the most abundant uncombined element. The element nitrogen was discovered as a separable component of air, by Scottish physician Daniel Rutherford, in 1772.Many industrially important compounds, such as ammonia, nitric acid, organic nitrates (propellants and explosives), and cyanides, contain nitrogen. The extremely strong triple bond in elemental nitrogen (N≡N) dominates nitrogen chemistry, causing difficulty for both organisms and industry in converting the N2 into useful compounds, but at the same time causing release of large amounts of often useful energy when the compounds burn, explode, or decay back into nitrogen gas. Synthetically-produced ammonia and nitrates are key industrial fertilizers and fertilizer nitrates are key pollutants in causing the eutrophication of water systems.Outside the major uses of nitrogen compounds as fertilizers and energy-stores, nitrogen is a constituent of organic compounds as diverse as Kevlar fabric and cyanoacrylate ""super"" glue. Nitrogen is a constituent of molecules in every major pharmacological drug class, including antibiotics. Many drugs are mimics or prodrugs of natural nitrogen-containing signal molecules: for example, the organic nitrates nitroglycerin and nitroprusside control blood pressure by being metabolized to nitric oxide. Plant alkaloids (often defense chemicals) contain nitrogen by definition, and thus many notable nitrogen-containing drugs, such as caffeine and morphine are either alkaloids or synthetic mimics that act (as many plant alkaloids do) on receptors of animal neurotransmitters (for example, synthetic amphetamines).Nitrogen occurs in all organisms, primarily in amino acids (and thus proteins), in the nucleic acids (DNA and RNA) and in the energy transfer molecule adenosine triphosphate. The human body contains about 3% by mass of nitrogen, the fourth most abundant element in the body after oxygen, carbon, and hydrogen. The nitrogen cycle describes movement of the element from the air, into the biosphere and organic compounds, then back into the atmosphere.
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