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Article ; Online: ^{7}Be(n,p)^{7}Li Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN.

Damone, L / Barbagallo, M / Mastromarco, M / Mengoni, A / Cosentino, L / Maugeri, E / Heinitz, S / Schumann, D / Dressler, R / Käppeler, F / Colonna, N / Finocchiaro, P / Andrzejewski, J / Perkowski, J / Gawlik, A / Aberle, O / Altstadt, S / Ayranov, M / Audouin, L /

Bacak, M / Balibrea-Correa, J / Ballof, J / Bécares, V / Bečvář, F / Beinrucker, C / Bellia, G / Bernardes, A P / Berthoumieux, E / Billowes, J / Borge, M J G / Bosnar, D / Brown, A / Brugger, M / Busso, M / Caamaño, M / Calviño, F / Calviani, M / Cano-Ott, D / Cardella, R / Casanovas, A / Castelluccio, D M / Catherall, R / Cerutti, F / Chen, Y H / Chiaveri, E / Correia, J G M / Cortés, G / Cortés-Giraldo, M A / Cristallo, S / Diakaki, M / Dietz, M / Domingo-Pardo, C / Dorsival, A / Dupont, E / Duran, I / Fernandez-Dominguez, B / Ferrari, A / Ferreira, P / Furman, W / Ganesan, S / García-Rios, A / Gilardoni, S / Glodariu, T / Göbel, K / Gonçalves, I F / González-Romero, E / Goodacre, T D / Griesmayer, E / Guerrero, C / Gunsing, F / Harada, H / Heftrich, T / Heyse, J / Jenkins, D G / Jericha, E / Johnston, K / Kadi, Y / Kalamara, A / Katabuchi, T / Kavrigin, P / Kimura, A / Kivel, N / Köster, U / Kokkoris, M / Krtička, M / Kurtulgil, D / Leal-Cidoncha, E / Lederer-Woods, C / Leeb, H / Lerendegui-Marco, J / Lo Meo, S / Lonsdale, S J / Losito, R / Macina, D / Marganiec, J / Marsh, B / Martínez, T / Masi, A / Massimi, C / Mastinu, P / Matteucci, F / Mazzone, A / Mendoza, E / Milazzo, P M / Mingrone, F / Mirea, M / Musumarra, A / Negret, A / Nolte, R / Oprea, A / Patronis, N / Pavlik, A / Piersanti, L / Piscopo, M / Plompen, A / Porras, I / Praena, J / Quesada, J M / Radeck, D / Rajeev, K / Rauscher, T / Reifarth, R / Riego-Perez, A / Rothe, S / Rout, P / Rubbia, C / Ryan, J / Sabaté-Gilarte, M / Saxena, A / Schell, J / Schillebeeckx, P / Schmidt, S / Sedyshev, P / Seiffert, C / Smith, A G / Sosnin, N V / Stamatopoulos, A / Stora, T / Tagliente, G / Tain, J L / Tarifeño-Saldivia, A / Tassan-Got, L / Tsinganis, A / Valenta, S / Vannini, G / Variale, V / Vaz, P / Ventura, A / Vlachoudis, V / Vlastou, R / Wallner, A / Warren, S / Weigand, M / Weiß, C / Wolf, C / Woods, P J / Wright, T / Žugec, P

Physical review letters

2018 Volume 121, Issue 4, Page(s) 42701

Abstract: We report on the measurement of the ^{7}Be(n,p)^{7}Li cross section from thermal to approximately ... consistent with the values inferred from the time-reversal ^{7}Li(p,n)^{7}Be reaction, thus yielding only ... 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n_TOF facility ...

Abstract	We report on the measurement of the ^{7}Be(n,p)^{7}Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction plays a key role in the lithium yield of the big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements performed on this reaction did not cover the energy window of interest for BBN, and they showed a large discrepancy between each other. The measurement was performed with a Si telescope and a high-purity sample produced by implantation of a ^{7}Be ion beam at the ISOLDE facility at CERN. While a significantly higher cross section is found at low energy, relative to current evaluations, in the region of BBN interest, the present results are consistent with the values inferred from the time-reversal ^{7}Li(p,n)^{7}Be reaction, thus yielding only a relatively minor improvement on the so-called cosmological lithium problem. The relevance of these results on the near-threshold neutron production in the p+^{7}Li reaction is also discussed.
Language	English
Publishing date	2018-07-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.121.042701
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Article: The Macromolecular Basis of Phytoplankton C:N:P Under Nitrogen Starvation.

Liefer, Justin D / Garg, Aneri / Fyfe, Matthew H / Irwin, Andrew J / Benner, Ina / Brown, Christopher M / Follows, Michael J / Omta, Anne Willem / Finkel, Zoe V

Frontiers in microbiology

2019 Volume 10, Page(s) 763

Abstract: Biogeochemical cycles in the ocean are strongly affected by the elemental stoichiometry (C:N:P ... lipid, nucleic acids, pigments) of C:N:P in diatoms and prasinophytes, two globally important ... by lipid accumulation. Variation in C:P and N:P was species-specific and mainly determined by residual P ...

Abstract	Biogeochemical cycles in the ocean are strongly affected by the elemental stoichiometry (C:N:P) of phytoplankton, which largely reflects their macromolecular content. A greater understanding of how this macromolecular content varies among phytoplankton taxa and with resource limitation may strengthen physiological and biogeochemical modeling efforts. We determined the macromolecular basis (protein, carbohydrate, lipid, nucleic acids, pigments) of C:N:P in diatoms and prasinophytes, two globally important phytoplankton taxa, in response to N starvation. Despite their differing cell sizes and evolutionary histories, the relative decline in protein during N starvation was similar in all four species studied and largely determined variations in N content. The accumulation of carbohydrate and lipid dominated the increase in C content and C:N in all species during N starvation, but these processes differed greatly between diatoms and prasinophytes. Diatoms displayed far greater accumulation of carbohydrate with N starvation, possibly due to their greater cell size and storage capacity, resulting in larger increases in C content and C:N. In contrast, the prasinophytes had smaller increases in C and C:N that were largely driven by lipid accumulation. Variation in C:P and N:P was species-specific and mainly determined by residual P pools, which likely represent intracellular storage of inorganic P and accounted for the majority of cellular P in all species throughout N starvation. Our findings indicate that carbohydrate and lipid accumulation may play a key role in determining the environmental and taxonomic variability in phytoplankton C:N. This quantitative assessment of macromolecular and elemental content spanning several marine phytoplankton species can be used to develop physiological models for ecological and biogeochemical applications.
Language	English
Publishing date	2019-04-17
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2587354-4
ISSN	1664-302X
ISSN	1664-302X
DOI	10.3389/fmicb.2019.00763
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Article: Nutrient (C, N and P) enrichment induces significant changes in the soil metabolite profile and microbial carbon partitioning

Brown, Robert W. / Chadwick, David R. / Bending, Gary D. / Collins, Chris D. / Whelton, Helen L. / Daulton, Emma / Covington, James A. / Bull, Ian D. / Jones, Davey L.

Soil biology & biochemistry. 2022 Sept., v. 172

2022

Abstract: ... of key macronutrients, particularly nitrogen (N) and phosphorus (P). The relative ratio ... a labile C source (glucose) in combination with N and/or P. After incorporation of the added glucose ... biomass following C, N and P addition. Further, N addition led to an increase in glucose-C partitioning ...

Abstract	The cycling of soil organic matter (SOM) and carbon (C) within the soil is governed by the presence of key macronutrients, particularly nitrogen (N) and phosphorus (P). The relative ratio of these nutrients has a direct effect on the potential rates of microbial growth and nutrient processing in soil and thus is fundamental to ecosystem functioning. However, the effect of changing soil nutrient stoichiometry on the small organic molecule (i.e., metabolite) composition and cycling by the microbial community remains poorly understood. Here, we aimed to disentangle the effect of stoichiometrically balanced nutrient addition on the soil metabolomic profile and apparent microbial carbon use efficiency (CUE) by adding a labile C source (glucose) in combination with N and/or P. After incorporation of the added glucose into the microbial biomass (48 h), metabolite profiling was undertaken by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). 494 metabolites were identified across all treatments mainly consisting of lipids (n = 199), amino acids (n = 118) and carbohydrates (n = 43), >97% of which showed significant changes in concentration between at least one treatment. Overall, glucose-C addition generally increased the synthesis of other carbohydrates in soil, while addition of C and N together increased peptide synthesis, indicative of protein formation and turnover. The combination of C and P significantly increased the number of fatty acids synthesised. There was no significant change in the PLFA-derived microbial community structure or microbial biomass following C, N and P addition. Further, N addition led to an increase in glucose-C partitioning into anabolic processes (i.e., increased CUE), suggesting the microbial community was N, but not P limited. Based on the metabolomic profiles observed here, we conclude that inorganic nutrient enrichment causes substantial shifts in both primary and secondary metabolism within the microbial community, leading to changes in resource flow and thus soil functioning, however, the microbial community illustrated significant metabolic flexibility.
Keywords	community structure ; ecosystems ; glucose ; metabolism ; metabolites ; metabolomics ; microbial biomass ; microbial carbon ; microbial communities ; microbial growth ; nitrogen ; peptides ; phosphorus ; soil ; soil nutrients ; soil organic matter ; stoichiometry ; tandem mass spectrometry
Language	English
Dates of publication	2022-09
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	280810-9
ISSN	0038-0717
ISSN	0038-0717
DOI	10.1016/j.soilbio.2022.108779
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Spray coating of the PCBM electron transport layer significantly improves the efficiency of p-i-n planar perovskite solar cells.

Zheng, Yifan / Kong, Jaemin / Huang, Di / Shi, Wei / McMillon-Brown, Lyndsey / Katz, Howard E / Yu, Junsheng / Taylor, André D

Nanoscale

2018 Volume 10, Issue 24, Page(s) 11342–11348

Abstract: The p-i-n structure for perovskite solar cells has recently shown significant advantages in minimal ... However, the power conversion efficiency (PCE) of the perovskite p-i-n structure remains low mainly due to limitations using ...

Abstract	The p-i-n structure for perovskite solar cells has recently shown significant advantages in minimal hysteresis effects, and scalable manufacturing potential using low-temperature solution processing. However, the power conversion efficiency (PCE) of the perovskite p-i-n structure remains low mainly due to limitations using a flat electron transport layer (ETL). In this work, we demonstrate a new approach using spray coating to fabricate the [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) ETL. By creating a rough surface, we effectively improve the light trapping properties inside the PCBM ETL. We reveal that the spray coated PCBM can form a cross-linked network, which may facilitate better charge transport and enhance extraction efficiency. By improving the contact between the perovskite film and the PCBM ETL, a reduction in the trap states is observed resulting in a PCE increase from 13% to >17%.
Language	English
Publishing date	2018-06-21
Publishing country	England
Document type	Journal Article
ZDB-ID	2515664-0
ISSN	2040-3372 ; 2040-3364
ISSN (online)	2040-3372
ISSN	2040-3364
DOI	10.1039/c8nr01763h
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Article ; Online: p-i-n Heterojunction solar cells with a colloidal quantum-dot absorber layer.

Ko, Dong-Kyun / Brown, Patrick R / Bawendi, Moungi G / Bulović, Vladimir

Advanced materials (Deerfield Beach, Fla.)

2014 Volume 26, Issue 28, Page(s) 4845–4850

Abstract: A quantum-dot (QD) p-i-n heterojunction solar cell with an increased depletion region is ...

Abstract	A quantum-dot (QD) p-i-n heterojunction solar cell with an increased depletion region is demonstrated by depleting the QD layer from both the front and back junctions. Due to a combination of improved charged extraction and increased light absorption, a 120% increase in the short-circuit current is achieved compared with that of conventional ZnO/QD devices.
Language	English
Publishing date	2014-05-26
Publishing country	Germany
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	1474949-X
ISSN	1521-4095 ; 0935-9648
ISSN (online)	1521-4095
ISSN	0935-9648
DOI	10.1002/adma.201401250
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Article ; Online: Rapid Ni, Zn, and Cu ion-promoted alcoholysis of N,N-bis(2-picolyl)- and N,N-bis((1H-benzimidazol-2-yl)methyl)-p-nitrobenzamides in methanol and ethanol.

Raycroft, Mark A R / Cimpean, Luana / Neverov, Alexei A / Brown, R Stan

Inorganic chemistry

2014 Volume 53, Issue 4, Page(s) 2211–2221

Abstract: ... p-nitrobenzamide (1) and N,N-bis((1H-benzimidazol-2-yl)methyl)-p-nitrobenzamide (2) were studied ... The methanolysis and ethanolysis of the Ni(II), Zn(II), and Cu(II) complexes of N,N-bis(2-picolyl ...

Abstract	The methanolysis and ethanolysis of the Ni(II), Zn(II), and Cu(II) complexes of N,N-bis(2-picolyl)-p-nitrobenzamide (1) and N,N-bis((1H-benzimidazol-2-yl)methyl)-p-nitrobenzamide (2) were studied under pH-controlled conditions at 25 °C. Details of the mechanism were obtained from plots of the kobs values for the reaction under pseudo-first-order conditions as a function of [M2+]. Such plots give saturation kinetics for the Cu(II)-promoted reactions of 1 and 2 in both solvents, the Zn(II)-promoted reaction of 1 in methanol, and the Zn(II)- and Ni(II)-promoted reactions of 2 in methanol and ethanol. Logs of the maximal observed rate constants obtained from the latter plots, (kobs(max)), when plotted versus s(s)pH, are curved downward only for the Cu(II) complexes of 1 and 2 in both solvents and the Zn(II) complex of 1 in methanol. Despite differences in the metal-binding abilities and pKa values for formation of the active form, there is a common reaction mechanism, with the active form being 1:M(II):(–OR) and 2:M(II):(–OR), where M(II):(–OR) is the metal-bound alkoxide. The acceleration provided by the metal ion is substantial, being 10(14)–10(19) relative to the k2(¯OMe) value for the alkoxide-promoted alcoholysis of the uncomplexed amide.
Language	English
Publishing date	2014-02-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	1484438-2
ISSN	1520-510X ; 0020-1669
ISSN (online)	1520-510X
ISSN	0020-1669
DOI	10.1021/ic4028755
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Article ; Online: Chloridobis[2-(diphenylphosphanyl)ethanamine-κ(2)P,N](triphenylphosphane-κP)ruthenium(II) chloride toluene monosolvate.

Brown, Robert J / Amenta, Donna S / Gilje, John W / Yap, Glenn P A

Acta crystallographica. Section C, Crystal structure communications

2013 Volume 69, Issue Pt 10, Page(s) 1104–1107

Abstract: ... ethanamine-κ(2)P,N](triphenylphosphane-κP)ruthenium(II) chloride toluene monosolvate, [RuCl(C18H15P)(C14H16NP ... ligand and a chloride ligand. The three P atoms are meridionally coordinated, with the Ph2P- groups ...

Abstract	The aminophosphane ligand 1-amino-2-(diphenylphosphanyl)ethane [Ph2P(CH2)2NH2] reacts with dichloridotris(triphenylphosphane)ruthenium(II), [RuCl2(PPh3)3], to form chloridobis[2-(diphenylphosphanyl)ethanamine-κ(2)P,N](triphenylphosphane-κP)ruthenium(II) chloride toluene monosolvate, [RuCl(C18H15P)(C14H16NP)2]Cl·C7H8 or [RuCl(PPh3){Ph2P(CH2)2NH2}2]Cl·C7H8. The asymmetric unit of the monoclinic unit cell contains two molecules of the Ru(II) cation, two chloride anions and two toluene molecules. The Ru(II) cation is octahedrally coordinated by two chelating Ph2P(CH2)2NH2 ligands, a triphenylphosphane (PPh3) ligand and a chloride ligand. The three P atoms are meridionally coordinated, with the Ph2P- groups from the ligands being trans. The two -NH2 groups are cis, as are the chloride and PPh3 ligands. This chiral stereochemistry of the [RuCl(PPh3){Ph2P(CH2)2NH2}2](+) cation is unique in ruthenium-aminophosphane chemistry.
Language	English
Publishing date	2013-10
Publishing country	United States
Document type	Journal Article
ZDB-ID	2025703-X
ISSN	1600-5759 ; 2053-2296 ; 0108-2701
ISSN (online)	1600-5759 ; 2053-2296
ISSN	0108-2701
DOI	10.1107/S0108270113023263
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Article ; Online: Review of Article: Leeper, N.J., Myers, J., Zhou, M., Nead, K.T., Syed, A., Kojima, Y. … Cooke, J.P. (2013). Exercise capacity is the strongest predictor of mortality in patients with peripheral arterial disease. Journal of Vascular Surgery, 57, 728-33.

Brown, Rebecca

Journal of vascular nursing : official publication of the Society for Peripheral Vascular Nursing

2017 Volume 35, Issue 2, Page(s) 112–113

MeSH term(s)	Exercise ; Humans ; Peripheral Arterial Disease ; Vascular Surgical Procedures
Language	English
Publishing date	2017
Publishing country	United States
Document type	Journal Article ; Comment
ZDB-ID	1083367-5
ISSN	1532-6578 ; 1062-0303
ISSN (online)	1532-6578
ISSN	1062-0303
DOI	10.1016/j.jvn.2017.04.002
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Article: A.S.P.E.N. clinical guidelines: nutrition support in adult acute and chronic renal failure.

Brown, Rex O / Compher, Charlene

JPEN. Journal of parenteral and enteral nutrition

2010 Volume 34, Issue 4, Page(s) 366–377

MeSH term(s)	Acute Kidney Injury/therapy ; Adult ; Humans ; Kidney Failure, Chronic/therapy ; Nutritional Support
Language	English
Publishing date	2010-07
Publishing country	United States
Document type	Journal Article ; Practice Guideline
ZDB-ID	800861-9
ISSN	0148-6071
ISSN	0148-6071
DOI	10.1177/0148607110374577
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Article: Measurement of the electric form factor of the neutron through d-->(e-->,e(')n)p at Q2 = 0.5 (GeV/c)(2).

Zhu, H / Ahmidouch, A / Anklin, H / Arenhövel, H / Armstrong, C / Bernet, C / Boeglin, W / Breuer, H / Brindza, P / Brown, D / Bültmann, S / Carlini, R / Chant, N / Cowley, A / Crabb, D / Danagoulian, S / Day, D B / Eden, T / Ent, R /

Farah, Y / Fatemi, R / Garrow, K / Harris, C / Hauger, M / Honegger, A / Jourdan, J / Kaufmann, M / Khandaker, M / Kubon, G / Lichtenstadt, J / Lindgren, R / Lourie, R / Lung, A / Mack, D / Malik, S / Markowitz, P / McFarlane, K / McKee, P / McNulty, D / Milanovich, G / Mitchell, J / Mkrtchyan, H / Mühlbauer, M / Petitjean, T / Prok, Y / Rohe, D / Rollinde, E / Rondon, O A / Roos, P / Sawafta, R / Sick, I / Smith, C / Southern, T / Steinacher, M / Stepanyan, S / Tadevosyan, V / Tieulent, R / Tobias, A / Vulcan, W / Warren, G / Wöhrle, H / Wood, S / Yan, C / Zeier, M / Zhao, J / Zihlmann, B

Physical review letters

2001 Volume 87, Issue 8, Page(s) 81801

Abstract: ... G(n)(E) via d-->(e-->,e(')n)p. G(n)(E) was determined from the beam-target asymmetry ... spectrometer in coincidence with neutrons in a large solid angle segmented detector. We find G(n)(E) = 0.04632+ ...

Abstract	We report the first measurement using a solid polarized target of the neutron electric form factor G(n)(E) via d-->(e-->,e(')n)p. G(n)(E) was determined from the beam-target asymmetry in the scattering of longitudinally polarized electrons from polarized deuterated ammonia ( 15ND3). The measurement was performed in Hall C at Thomas Jefferson National Accelerator Facility in quasifree kinematics with the target polarization perpendicular to the momentum transfer. The electrons were detected in a magnetic spectrometer in coincidence with neutrons in a large solid angle segmented detector. We find G(n)(E) = 0.04632+/-0.00616(stat)+/-0.00341(syst) at Q2 = 0.495 (GeV/c)(2).
Language	English
Publishing date	2001-08-20
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.87.081801
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