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Article ; Online: Brine residues and organics in the Urvara basin on Ceres.

Nathues, A / Hoffmann, M / Schmedemann, N / Sarkar, R / Thangjam, G / Mengel, K / Hernandez, J / Hiesinger, H / Pasckert, J H

Nature communications

2022 Volume 13, Issue 1, Page(s) 927

Abstract: Ceres is a partially differentiated dwarf planet, as confirmed by NASA's Dawn mission. The Urvara basin (diameter ~170 km) is its third-largest impact feature, enabling insights into the cerean crust. Urvara's geology and mineralogy suggest a potential ... ...

Abstract	Ceres is a partially differentiated dwarf planet, as confirmed by NASA's Dawn mission. The Urvara basin (diameter ~170 km) is its third-largest impact feature, enabling insights into the cerean crust. Urvara's geology and mineralogy suggest a potential brine layer at the crust-mantle transition. Here we report new findings that help in understanding the structure and composition of the cerean crust. These results were derived by using the highest-resolution Framing Camera images acquired by Dawn at Ceres. Unexpectedly, we found meter-scale concentrated exposures of bright material (salts) along the crater's upper central ridge, which originate from an enormous depth, possibly from a deep-seated brine or salt reservoir. An extended resurfacing modified the southern floor ~100 Myr after crater formation (~250 Myr), long after the dissipation of the impact-generated heat. In this resurfaced area, one floor scarp shows a granular flow pattern of bright material, showing spectra consistent with the presence of organic material, the first such finding on Ceres beyond the vast Ernutet area. Our results strengthen the hypothesis that Ceres is and has been a geologically active world even in recent epochs, with salts and organic-rich material playing a major role in its evolution.
MeSH term(s)	Earth, Planet ; Evolution, Planetary ; Geology ; Salts
Chemical Substances	Salts ; brine
Language	English
Publishing date	2022-02-22
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-022-28570-8
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book: Der organische Stickstoff im Boden

Mengel, Konrad

sein Umsatz und seine Bedeutung für Boden und Pflanze

1992

Author's details	Konrad Mengel
Keywords	Zuckerrübenanbau ; Boden-Pflanze-System ; Stickstoffkreislauf
Subject	Stickstoffdynamik ; Stickstoff ; Pflanze-Boden-System ; Boden-Pflanzen-System ; Zuckerrübe
Size	S. 57 - 59
Publishing place	S.l.
Document type	Book
Remark	in: *Z 3987 (1991/92)
HBZ-ID	HT006338208
Database	ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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Book: Ernährung und Stoffwechsel der Pflanze

Mengel, Konrad

mit 109 Tabellen

1991

Author's details	Konrad Mengel
Keywords	Pflanzenernährung ; Pflanzen ; Stoffwechsel
Subject	Flora ; Pflanze ; Landpflanzen ; Pflanzen ; Metabolismus ; Verstoffwechselung ; Metabolische Regulation
Language	German
Size	466, [16] S. : z. T. farb. Ill., graph. Darst.
Edition	7., überarb. Aufl.
Publisher	Fischer
Publishing place	Jena
Publishing country	Germany
Document type	Book
HBZ-ID	HT003761999
ISBN	3-334-00310-8 ; 978-3-334-00310-7
Database	Catalogue ZB MED Nutrition, Environment, Agriculture

In stock of ZB MED Bonn / Germany

Shelf mark	Loan status	Location
L/PFL 2-3166	available for loan (reading room)	Lesesaal
918/507	available for loan (reading room)	Freihandmagazin (U1)

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Article: Alternative or complementary role of foliar supply in mineral nutrition

Mengel, K

Acta horticulturae. 2002 Nov., , no. 594

2002

Abstract: Morphology and organisation of leaf tissue is such that it accomodates the uptake of gaseous plant nutrients, whilst that of roots the uptake of water-soluble solutes. These water soluble plant nutrients are mainly supplied with fertilizers. Only in ... ...

Abstract	Morphology and organisation of leaf tissue is such that it accomodates the uptake of gaseous plant nutrients, whilst that of roots the uptake of water-soluble solutes. These water soluble plant nutrients are mainly supplied with fertilizers. Only in exceptional cases where nutrients are strongly fixed by soils or where aerial nutrient requirement of a crop is higher than the root uptake rates, foliar application can be adopted as a routine fertilization measure. The efficiency with which foliar applied nutrients are utilized depends on the mobility of the specific nutrient throughout the entire plant, mobility comprising long distance transport especially phloem transport as well as the symplastic transport. Potassium and nitrogen are examples of nutrients showing high mobility and when taken up by leaves they can be rapidly distributed throughout the entire plant. Calcium, sulfur, and iron show a low mobility and Ca2+ taken up by leaves cannot be transported to younger tissues or fruits where it may be required. Micronutrient requirements can generally be better met by foliar application than requirements of macronutrients because in absolute terms higher quantities of macronutrients are needed. Iron in the leaf apoplast can be mobilized by a foliar application of diluted acids.
Keywords	acids ; apoplast ; calcium ; fertilizer requirements ; fertilizers ; foliar application ; fruits ; leaves ; nitrogen ; nutrients ; phloem ; potassium ; roots ; solutes ; sulfur
Language	English
Size	p. 33-47.
Publishing place	International Society for Horticultural Science
Document type	Article
Note	Paper presented at the International Symposium on Foliar Nutrition of Perennial Fruit Plants, held September 11-15, 2001, Meran, Italy.
ISSN	0567-7572
Database	NAL-Catalogue (AGRICOLA)

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Book: Herkunft und Migration mineralgebundener Gase in marinen Evaporiten

Mengel, K.

Title variant	Origin and migration of mineral-bound gases in marine evaporites
Institution	Technische Universitaet Clausthal, Institut fuer Mineralogie und Mineralische Rohstoffe, Fachgebiet Mineralogie, Geochemie, Salzlagerstaetten, 38670, 38670, Clausthal-Zellerfeld, DE
Keywords	Stratigraphie ; Lagerung ; Stickstoff ; Ionenchromatografie ; Probenahme ; Spektralanalyse ; Migration ; Mineralstoff ; Marines Oekosystem ; Gestein ; Calciumcarbonat ; Isotop ; Isotopenverhaeltnis ; Chemie ; Geologie ; Naturstoff ; Natuerlichkeit ; Gasanalyse ; Gasfoermiger Stoff ; Nachweisbarkeit ; Wanderungsgeschwindigkeit ; Sauerstoff ; Untersuchungsprogramm ; Meerwasser ; Verdunstung ; Atmosphaere ; Ausbreitungsvorgang ; Gaschromatografie ; Gasspeicher ; IR-Spektroskopie ; Massenspektrometrie ; Spektrum ; Duennschichtchromatografie ; Fluorimetrie ; Roentgenspektroskopie ; Raman-Effekt ; Fraktionierung ; Abdichtung ; Messverfahren ; Frischluftsystem ; Deponieentgasung ; Deponiegas ; Tektonik ; Stroemungsmechanik
Document type	Book
Remark	project start: 07/01/2001 project end: 12/31/2004 grant ID: 02C0841
Database	Environmental research database (UFORDAT) of the German Federal Environment Agency (UBA)

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Book: Ernährung und Stoffwechsel der Pflanze

Mengel, Konrad

mit 97 Tabellen

1984

Author's details	Professor Dr. Konrad Mengel
Keywords	Pflanzenernährung ; Pflanzen ; Stoffwechsel ; Stoffübertragung
Subject	Stoffaustausch ; Stofftransport ; Stofftransfer ; Stoffumsetzung ; Massentransfer ; Massentransport ; Flora ; Pflanze ; Landpflanzen ; Metabolismus ; Verstoffwechselung ; Metabolische Regulation ; Pflanzen
Language	German
Size	431, XVI Seiten, 158 Illustrationen und Diagramme
Edition	Sechste, überarbeitete Auflage
Publisher	Gustav Fischer Verlag
Publishing place	Stuttgart
Publishing country	Germany
Document type	Book
HBZ-ID	HT002704439
ISBN	3-437-20307-X ; 978-3-437-20307-7
Database	Catalogue ZB MED Nutrition, Environment, Agriculture

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Shelf mark	Loan status	Location
848/138 +6	order for loan	Geschlossenes Magazin (U2)

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Article ; Online: Prospective study of the natural history of chronic acid sphingomyelinase deficiency in children and adults: eleven years of observation.

McGovern, Margaret M / Wasserstein, Melissa P / Bembi, Bruno / Giugliani, Roberto / Mengel, K Eugen / Vanier, Marie T / Zhang, Qi / Peterschmitt, M Judith

Orphanet journal of rare diseases

2021 Volume 16, Issue 1, Page(s) 212

Abstract: Background: Acid sphingomyelinase deficiency (ASMD) (also known as Niemann-Pick disease types A and B) is a rare and debilitating lysosomal storage disorder. This prospective, multi-center, multinational longitudinal study aimed to characterize the ... ...

Abstract	Background: Acid sphingomyelinase deficiency (ASMD) (also known as Niemann-Pick disease types A and B) is a rare and debilitating lysosomal storage disorder. This prospective, multi-center, multinational longitudinal study aimed to characterize the clinical features of chronic forms of ASMD and disease burden over time in children and adults. Results: Fifty-nine patients (31 males/28 females) ranging in age from 7 to 64 years with chronic ASMD types A/B and B and at least two disease symptoms participated from 5 countries. Disease characteristics were assessed at baseline, after 1 year, and at the final visit (ranging from 4.5 to 11 years). Thirty patients (51%) were < 18 years at baseline (median age 12 years), and 29 were adults (median age 32 years). Overall, 32/59 patients completed the final visit, 9 died, 9 discontinued, and 9 were lost to follow up. Common clinical characteristics that tended to worsen gradually with time were splenomegaly, hepatomegaly, interstitial lung disease, lung diffusion capacity (DL Conclusions: This study provides important information about the natural history of chronic ASMD and provides a longitudinal view of the spectrum of disease manifestations and major morbidities in children and adults and supports the selection of clinically meaningful endpoints in therapeutic trials.
MeSH term(s)	Adolescent ; Adult ; Child ; Child, Preschool ; Female ; Humans ; Longitudinal Studies ; Lung Diseases, Interstitial ; Male ; Middle Aged ; Niemann-Pick Disease, Type A ; Niemann-Pick Diseases ; Prospective Studies ; Sphingomyelin Phosphodiesterase ; Young Adult
Chemical Substances	Sphingomyelin Phosphodiesterase (EC 3.1.4.12)
Language	English
Publishing date	2021-05-10
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2225857-7
ISSN	1750-1172 ; 1750-1172
ISSN (online)	1750-1172
ISSN	1750-1172
DOI	10.1186/s13023-021-01842-0
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Article: Effect of Potassium Supply on the Rate of Phloem Sap Exudation and the Composition of Phloem Sap of Ricinus communis.

Mengel, K / Haeder, H E

Plant physiology

2006 Volume 59, Issue 2, Page(s) 282–284

Abstract: The composition of phloem sap has been investigated in Ricinus communis var. gibsonii, grown for 2 weeks on nutrient solution of low and high potassium content (K(1) and K(2)). Diagonal cuts were made in the bark of the stem resulting in the exudation of ...

Abstract	The composition of phloem sap has been investigated in Ricinus communis var. gibsonii, grown for 2 weeks on nutrient solution of low and high potassium content (K(1) and K(2)). Diagonal cuts were made in the bark of the stem resulting in the exudation of clear droplets which mainly consisted of phloem sap. Although the plants at low K (0.4 mm) and high K (1 mm) did not differ in growth, leaf area, height, or stem circumference, the rate of exudation of the high K plants was about twice as high as that of the plants with the lower K supply. This promoting effect of K on exudation did not result in a dilution of organic (sucrose, UDP-glucose, ATP, UTP) and inorganic constituents of the phloem sap. For the following compounds, even significantly higher concentrations in the exudate were observed in the K(2) plants: potassium, raffinose, glucose 6-phosphate, and fructose 6-phosphate. Also, the osmotic pressure of the phloem sap was substantially increased in the higher K treatment. Experiments in which labeled (14)CO(2) was applied to one leaf showed that K had a favorable effect on the assimilation of CO(2), and in particular promoted the export of photosynthates from the leaf. It is suggested that the higher rate of phloem-loading in the plants with the better K supply is due to the higher CO(2) assimilation rate and especially to a better provision of ATP required for phloem loading. Higher phloem-loading rates result in higher osmotic pressure in the sieve tubes which probably gave rise to the higher flow rates observed in the plants with improved K supply.
Language	English
Publishing date	2006-04-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	208914-2
ISSN	1532-2548 ; 0032-0889
ISSN (online)	1532-2548
ISSN	0032-0889
DOI	10.1104/pp.59.2.282
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Active extrusion of protons into deionized water by roots of intact maize plants.

Mengel, K / Schubert, S

Plant physiology

2006 Volume 79, Issue 2, Page(s) 344–348

Abstract: The investigations were focussed on the question as to whether roots of intact maize plants (Zea mays L. cv Blizzard) release protons into deionized H(2)O. Plants in the six to seven leaf stage depressed the pH of deionized H(2)O from 6 to about 4.8 ... ...

Abstract	The investigations were focussed on the question as to whether roots of intact maize plants (Zea mays L. cv Blizzard) release protons into deionized H(2)O. Plants in the six to seven leaf stage depressed the pH of deionized H(2)O from 6 to about 4.8 during an experimental period of 4 hours. Only one-third of the protons released could be ascribed to the solvation of CO(2) in H(2)O. The main counter anions released were Cl(-), NO(3) (-), and SO(4) (2-). At low temperature (2 degrees C), the H(+) release was virtually blocked while a relatively high amount of K(+) was released. The presence of K(+), Na(+), Ca(2+), and Mg(2+) in the external solution increased the H(+) secretion significantly. Addition of vanadate to the outer medium inhibited the H(+) release while fusicoccin had a stimulating effect. Substituting the nutrient solution of deionized H(2)O resulted in a substantial increase of the membrane potential difference from -120 to -190 millivolts. The experimental results support the conclusion that the H(+) release by roots of intact maize plants is an active process driven by a plasmalemmalocated ATPase. Since the net H(+) release was not associated with a net uptake of K(+), it is unlikely to originate from a K(+)/H(+) antiport.
Language	English
Publishing date	2006-04-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	208914-2
ISSN	1532-2548 ; 0032-0889
ISSN (online)	1532-2548
ISSN	0032-0889
DOI	10.1104/pp.79.2.344
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Ionic balance in different tissues of the tomato plant in relation to nitrate, urea, or ammonium nutrition.

Kirkby, E A / Mengel, K

Plant physiology

2006 Volume 42, Issue 1, Page(s) 6–14

Abstract: An investigation was carried out to study the cation-anion balance in different tissues of tomato plants supplied with nitrate, urea, or ammonium nitrogen in water culture.Irrespective of the form of nutrition, a very close balance was found in the ... ...

Abstract	An investigation was carried out to study the cation-anion balance in different tissues of tomato plants supplied with nitrate, urea, or ammonium nitrogen in water culture.Irrespective of the form of nutrition, a very close balance was found in the tissues investigated (leaves, petioles, stems, and roots) between total cations (Ca, Mg, K and Na), and total anions (NO(3) (-), H(2)PO(4) (-), SO(4) (--), Cl(-)) total non-volatile organic acids, oxalate, and uronic acids. In comparison with the tissues of the nitrate fed plants, the corresponding ammonium tissues contained lower concentrations of inorganic cations, and organic acids and a correspondingly higher proportion of inorganic anions. Tissues from the urea plants were intermediate between the other 2 treatments. These results were independent of concentration or dilution effects, caused by growth. In all tissues approximately equivalent amounts of diffusible cations (Ca(++), Mg(++), K(+) and Na(+)), and diffusible anions (No(3) (-), SO(4) (--), H(2)PO(4) (-), Cl(-)) and non-volatile organic acids were found. An almost 1:1 ratio occurred between the levels of bound calcium and magnesium, and oxalate and uronic acids. This points to the fact that in the tomato plant the indiffusible anions are mainly oxalate and pectate. Approximately equivalent values were found for the alkalinity of the ash, and organic anions (total organic acids including oxalate, and uronic acids).The influence of nitrate, urea, and ammonium nitrogen nutrition on the cation-anion balance and the organic acid content of the plant has been considered and the effects of these different nitrogen forms on both the pH of the plant and the nutrient medium and its consequences discussed.
Language	English
Publishing date	2006-04-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	208914-2
ISSN	1532-2548 ; 0032-0889
ISSN (online)	1532-2548
ISSN	0032-0889
DOI	10.1104/pp.42.1.6
Database	MEDical Literature Analysis and Retrieval System OnLINE

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