The high correlation between DNA and chloroform-labile N in various types of soil

2017 ◽  
Vol 117-118 ◽  
pp. 1-9 ◽  
Author(s):  
Saki Yokoyama ◽  
Kaoru Yuri ◽  
Takiko Nomi ◽  
Masashi Komine ◽  
Shin-ichi Nakamura ◽  
...  
Keyword(s):  
Labile N

Anti-cancer activity of an acid-labile N-alkylisatin conjugate targeting the transferrin receptor

2012 ◽  
Vol 316 (2) ◽  
pp. 151-156 ◽  
Author(s):  
Vineesh Indira Chandran ◽  
Lidia Matesic ◽  
Julie M. Locke ◽  
Danielle Skropeta ◽  
Marie Ranson ◽  
...  
Keyword(s):  
Transferrin Receptor ◽  
Anti Cancer ◽  
Labile N ◽  
Acid Labile ◽  
Cancer Activity

Organic C and nutrients in surface soils from some primary rainforests, derived grasslands and secondary rainforests on the Atherton Tableland in North East Queensland

Soil Research ◽  
1993 ◽  
Vol 31 (3) ◽  
pp. 343 ◽  
Author(s):  
J Maggs ◽  
B Hewett
Keyword(s):  
Metamorphic Rock ◽  
Forest Type ◽  
Mineral Soil ◽  
Chemical Properties ◽  
Primary Forest ◽  
Long Term Effects ◽  
Organic C ◽  
North East ◽  
Exchangeable Ca ◽  
Labile N

Some long term effects of (a) converting rainforest to grassland, and (b) rainforest regeneration on cleared land were investigated by comparing chemical properties of mineral soil (0-10 cm depth) from beneath primary rainforest, derived grassland and old secondary rainforest. Grasslands and secondary rainforest. were on land cleared at least 50 years ago. The study was undertaken on the Atherton Tableland in north east Queensland using soils formed on basalt, granite and metamorphic rocks. Organic C, kjeldahl N and labile N were 15-50% lower (P < 0.05) beneath grassland than primary rainforest for all soils, and were higher beneath secondary rainforest than grassland. Exchangeable Ca varied in a similar way in basaltic soils but did not differ between vegetation types in the other soils. Extractable Al was lower under grassland than either forest type for soils formed on granite and metamorphic rock. Total and organic P concentrations did not differ between primary forest and grassland, but were lowest under secondary rainforest for soils on metamorphic rock.

Hydroarylation of Alkynes with Phenols in the Presence of Gallium Complexes of a Labile N-Ligand: Synthesis of Chromenes

2015 ◽  
Vol 2015 (26) ◽  
pp. 5781-5788 ◽  
Author(s):  
Mikhail V. Moskalev ◽  
Arkadiy M. Yakub ◽  
Alexander G. Morozov ◽  
Evgenii V. Baranov ◽  
Olga V. Kazarina ◽  
...  
Keyword(s):  
Ligand Synthesis ◽  
Labile N ◽  
Gallium Complexes

scholarly journals Rat brain microsomal gangliosides. Accessibility to a neuraminidase preparation and the possible existence of different pools in relation to their biosynthesis

1974 ◽  
Vol 138 (2) ◽  
pp. 291-298 ◽  
Author(s):  
H. J. F. Maccioni ◽  
A. Arce ◽  
C. Landa ◽  
R. Caputto
Keyword(s):  
Rat Brain ◽  
Chemical Structure ◽  
Proper Position ◽  
Neuraminidase Treatment ◽  
Acetylneuraminic Acid ◽  
Microsomal Membranes ◽  
Labelling Experiment ◽  
Labile N ◽  
The Right

1. Treatment of rat brain microsomal membranes with a neuraminidase preparation from Clostridium perfringens resulted in an almost complete conversion of polysialogangliosides into monosialogangliosides. 2. Neuraminidase treatment of the membranes did not increase the incorporation of N-[3H]acetylneuraminic acid from CMP-N-[3H]acetylneuraminic acid into the gangliosidic fraction, indicating that a monosialoganglioside is an acceptor of N-acetylneuraminic acid in these membranes only if, in addition to having the right chemical structure, it is in a proper position, probably in relation to the endogenous sialyltransferases. 3. These experiments also indicated that no independent turnover of the neuraminidase-labile N-acetylneuraminyl groups of gangliosides occurred in vitro. 4. N-[3H]Acetylneuraminic acid from endogenous polysialogangliosides labelled in vitro was released by neuraminidase at a slower rate than N-acetylneuraminic acid from unlabelled gangliosides of the same membranes. From this it was concluded that recently synthesized polysialogangliosides (completed in vitro) are in the membranes in a position less accessible to neuraminidase than are those synthesized earlier which were present in the membranes at the start of the labelling experiment.

Übergangsmetallkomplexe mit Schwefelliganden, CI*. Synthese und Struktur von N2H5[Fe(N2H4)(S2C6H4)2] · 1,33N2H4 / Transition Metal Complexes with Sulfur Ligands, Cl*. Synthesis and Structure of N2H5[Fe(N2H4)(S2C6H4)2] · 1,33N2H4

1994 ◽  
Vol 49 (5) ◽  
pp. 660-664 ◽  
Author(s):  
Dieter Sellmann ◽  
Helge Friedrich ◽  
Falk Knoch
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Structure Analysis ◽  
High Spin ◽  
Transition Metal Complexes ◽  
X Ray ◽  
Labile N

Attempts to coordinate N2H4 to [Fe(S2C6H4)2] fragments lead to N2H5[Fe(N2H4)(S2C6H4)2], which crystallizes from MeOH/N2H4 solutions as the solvate [(N2H5){Fe(N2H4)(S2C6H4)2} · 1,33 N2H4]. 1, and has been characterized by X-ray structure analysis. 1 contains three discrete N2H5+ cations, four N2H4 solvate molecules and three independent [Fe(N2H4)(S2C6H4)2]- anions which are connected via an extended network of N-H ··· N and N-H ··· S bridges. N2H5[Fe(N2H4)(S2ChH4)2] and 1 contain high-spin Fe(III) centers and labile N2H4 ligands.

scholarly journals Mannan molecular sub-structures control nanoscale glucan exposure in Candida

2017 ◽  
Author(s):  
Matthew S. Graus ◽  
Michael J. Wester ◽  
Douglas W. Lowman ◽  
David L. Williams ◽  
Michael D. Kruppa ◽  
...  
Keyword(s):  
Cell Wall ◽  
Candida Albicans ◽  
Super Resolution ◽  
Ligand Interaction ◽  
Interaction Sites ◽  
Single Receptor ◽  
Labile N ◽  
Innate Immune Evasion ◽  
Acid Labile

AbstractN-linked mannans (N-mannans) in the cell wall of Candida albicans are thought to mask β-(1,3)-glucan from recognition by Dectin-1, contributing to innate immune evasion. Lateral cell wall exposures of glucan on Candida albicans are predominantly single receptor-ligand interaction sites and are restricted to nanoscale geometries. Candida species exhibit a range of basal glucan exposures and their mannans also vary in size and complexity at the molecular level. We used super resolution fluorescence imaging and a series of protein mannosylation mutants in C. albicans and C. glabrata to investigate the role of specific N-mannan features in regulating the nanoscale geometry of glucan exposure. Decreasing acid labile mannan abundance and α-(1,6)-mannan backbone length correlated most strongly with increased density and nanoscopic size of glucan exposures in C. albicans and C. glabrata, respectively. Additionally, a C. albicans clinical isolate with high glucan exposure produced similarly perturbed N-mannan structures and exhibited similar changes to nanoscopic glucan exposure geometry. We conclude that acid labile N-mannan controls glucan exposure geometry at the nanoscale. Furthermore, variations in glucan nanoexposure characteristics are clinically relevant and are likely to impact the nature of the pathogenic surface presented to innate immunocytes at dimensions relevant to receptor engagement, aggregation and signaling.

NH-1,2,3-Triazoles from Azidomethyl Pivalate and Carbamates: Base-Labile N-Protecting Groups.

ChemInform ◽  
2006 ◽  
Vol 37 (14) ◽  
Author(s):  
Jon C. Loren ◽  
Antoni Krasinski ◽  
Valery V. Fokin ◽  
K. Barry Sharpless
Keyword(s):  
Protecting Groups ◽  
Labile N

Role of DIN and DON in nitrogen cycle in a humid subtropical forest catchment in northeast Taiwan

2020 ◽  
Author(s):  
Yu-Lin Yu ◽  
Jr-Chuan Huang ◽  
Ting-Chang Hsu ◽  
Teng-Chiu Lin
Keyword(s):  
Organic Molecules ◽  
N Saturation ◽  
Inorganic N ◽  
Dominant Form ◽  
Forested Watersheds ◽  
C And N ◽  
N Loading ◽  
Labile N ◽  
Fushan Experimental Forest

&lt;p&gt;Although global models of nitrogen (N) cycling typically focus on nitrate of ecosystem N saturation, dissolved organic nitrogen (DON) is the dominant form of nitrogen export from many watersheds. In previous hypotheses, DON dynamics in the watersheds was treated as being functionally equivalent to inorganic N forms. However, unlike inorganic N, the dynamics of N contained within organic molecules is controlled not only by direct biological demand for N, but also by heterotrophic demand for the reduced C, to which N is attached. During 2016-2018, we evaluated the DON release hypothesis and the passive carbon vehicle hypothesis by comparing streamwater DON, DOC, and DIN concentrations across Fushan experimental forested watershed in the northeast Taiwan. We found that (1) the export of the Fushan Experimental Forest (FEF) is N saturated and (2) the altering nature of the DON release hypothesis and passive carbon vehicle hypothesis between non-event days and typhoon events. Results show that DON concentrations change systematically with increasing nitrate concentrations in all surveys. Among which, DON concentration correlates negatively with nitrate concentration in non-event days but positively during typhoon events. Our results support the coupling between DIN, DON, and DOC concentrations in forested watersheds that are subject to high rates of anthropogenic N loading. In non-event days, the N-containing dissolved organic matter may be in a labile form of carbon. Thus, alleviating heterotrophic N limitation may result in a decrease in DON export (passive carbon vehicle hypothesis), while during typhoon events, DON losses increase as demand for labile N forms attenuates (DON release hypothesis). These hypotheses are not mutually exclusive but represent the potentially contrasting roles of DON within C and N cycles. Our study suggests that bioavailability assays and addition experiments will present variations in the direct biological demand for N and heterotrophic demand for the reduced C, which is informative and necessary for characterizing the processes controlling DON export.&lt;br&gt;&lt;br&gt;&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Keywords:&lt;/strong&gt; DON, DIN, N saturation, DON release hypothesis, passive carbon vehicle hypothesis&lt;/p&gt;

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