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  • 1996  (3,889)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (3,889)
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  • 1
    ISSN: 1436-6215
    Keywords: Ovariectomy ; pig ; bone histology ; calcitriol ; parathyroid hormone ; alkaline phosphatase ; Ovariektomie ; Schwein ; Knochenhistologie ; Calcitriol ; Parathormon ; alkalische Phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung In der vorliegenden Untersuchung sollte die Eignung des ovariektomierten Schweins als Modell für die postmenopausale Osteoporose beschrieben werden. Hierzu wurde der Einfluß der Ovariektomie (OVX) auf Plasmaparameter des Knochenstoffwechsels und auf knochenhistologische Parameter bei zwei Gruppen von Sauen (9 Monate alt, Nullipara oder 35 Monate alt, Multipara) untersucht. Eine Standarddiät für Schweine mit einem Calciumgehalt von 1,5 % wurde verabreicht. Gesamt-und knochenspezifische alkalische Phosphatase (APt, APb) Calcidiol, Calcitriol und Parathormon (PTH) wurden im Plasma 4, 8, 12 und 18 Monate nach OVX bestimmt. Der Mineralgehalt sowie histologische Parameter wurden in repräsentativen Knochenproben 12 Monate nach OVX und am Ende des Versuchs 18 Monate nach OVX gemessen. Bei jungen Sauen führte die Ovariektomie zu keinen signifikanten Veränderungen der Plasmaparameter mit Ausnahme höherer Konzentrationen des Calcitriols 4 Monate nach OVX. Es wurden weder 12 noch 20 Monate nach OVX signifikante Unterschiede zwischen OVX- und Kontrolltieren in den Parametern der chemischen oder histologischen Knochenanalyse beobachtet. Bei multiparen Sauen waren die Plasmakonzentrationen des PTH gegenüber den Kontrolltieren 8 Monate nach OVX signifikant erhöht. Die Konzentrationen des Calcitriols sowie die Aktivität der APt und APb lagen 12 Monate nach OVX signifikant über den Werten der intakten Tiere. Alle Effekte waren moderat. Weder 12 Monate noch 20 Monate nach OVX kam es zu signifikanten Veränderungen in den Parametern der chemischen oder histologischen Knochenanalyse. Obwohl die beobachteten Veränderungen in den klinisch-chemischen Plasmaparametern zweifellos keine histomorphometrischen Anzeichen einer Osteopenie/Osteoporose zur Folge hatten, bleibt es zukünftigen Untersuchungen überlassen nachzuprüfen, ob das Ausbleiben des Osteopenie ein Ergebnis der in diesem Experiment hohen Calciumzufuhr war. Eine solche Möglichkeit sollte aufgrund der Beobachtung in Betracht gezogen werden, daß Osteopenie beim Schwein nach OVX eintritt, wenn eine Diät mit geringerer Calciumzufuhr (0,75 % im Vergleich zu 0,9 %) verabreicht wurde (33).
    Notes: Summary To investigate the suitability of the pig as animal model for postmenopausal osteoprosis, effects of ovariectomy (OVX) on bone metabolism and histology were studied in two groups of sows (9 months, nulliparous or 35 months, multiparous). A standard diet of about 1.5 % calcium (Ca) was fed till sacrifice at either 12 or 20 months post OVX when mineral content and histology were studied in representative bone specimens of proximal tibia, iliac crest and lumbar vertebrae. At 4, 8, 12, and 18 months post OVX, total and bone-specific alkaline phosphatase (APt, APb) calcidiol, calcitriol and parathyroid hormone (PTH) were measured in plasma. In young sows OVX did not significantly affect plasma variables except for calcitriol, which was higher at 4 months post OVX. No significant differences between OVX or control animals were observed in the variables of bone chemical and histological analyses, neither 12 nor 20 months post OVX. In multiparous sows OVX significantly increased PTH plasma concentrations at 8 months post OVX and plasma calcitriol, APt and APb at 12 months post OVX. All effects were moderate and transient. OVX did not significantly affect the variables of bone chemical and histological analyses neither 12 nor 20 months post OVX. Although undoubtedly the clinical-chemical changes observed were not accompanied by any histomorphometric signs of osteopenia/osteoporosis, it must be left to future experiments as to whether this resulted from the ample calcium supply provided. This possibility is supported by recent observations showing that porcine osteopenia could be induced by OVX in animals maintained on only 0.75 % dietary calcium but not on higher (0.9 %) Ca regimens (33).
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  • 2
    ISSN: 1436-6215
    Keywords: Iodine prophylaxis ; iodized salt ; iodine excretion ; hyroid volume ; Jod ; Jodsalz ; Jodausscheidung ; Schilddrüsenvolumen ; Jodprophylaxe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Im Rahmen einer Gesundheitskampagne zu Jodmangel und Jodprophylaxe an fünf süddeutschen Universitäten wurde 1992 das Schilddrüsenvolumen und die renale Jodausscheidung bei 472 Männern und 568 Frauen (mittleres Alter 27,7 Jahre) bestimmt. Ziel war es den Einfluß des Ernährungswissens und der durchgeführten Jodprophylaxe auf den Jodversorgungsstatus der Studienteilnehmer in einem Jodmangelgebiet zu untersuchen. Das mittlere Schilddrüsenvolumen betrug 19,7±8,3 ml (x±SD) bei den Männern und 15,8±7,1 ml bei den Frauen. 19,9 % der Männer und 25,5 % der Frauen wiesen Schilddrüsenvolumina über der geschlechtspezifischen Norm auf. Die mittlere Jodausscheidung entsprach dem WHO-definierten Jodmangel Grad I (70,7±42 µg (J/g Kreatinin). 80,8 % bzw. 43,2 % des Gesamtkollektivs gaben an, Jodsalz zu verwenden bzw. Seefisch zu essen, um ihren Jodbedarf zu decken. Die korrespondierende Jodausscheidung der weiblichen Jodsalzverwender und Seefischesser war signifikant erhöht (83,9±47,6 vs. 61,4±31,3 µg J/g Kreatinin, p〈0,05). Das Schilddrüsenvolumen unterschied sich zwischen diesen Gruppen jedoch nicht. Der Aufenthaltsort der letzten 10 Jahre hatte keinen signifikanten Einfluß auf das Schilddrüsenvolumen. Die Häufigkeit von Schilddrüsenvolumina über der geschlechtsspezifischen Norm stieg mit dem Alter. Auch in diesem überdurchschnittlich gebildeten und jungen (81,8 % Studenten) Kollektiv war die Jodversorgung, gemessen am Schilddrüsenvolumen und an der Jodausscheidung, und das Wissen über Jod und Ernähung schlecht. Die derzeit durchgeführte individuelle Jodprophylaxe führt nicht zu einer ausreichenden Jodversorgung. Der Einsatz von jodiertem Speisesalz in Haushalten und Kantinen, und auch für die industrielle Herstellung von Lebensmitteln muß erhöht werden.
    Notes: Summary Thyroid volume, urinary iodine excretion as well as personal nutritional knowledge and individual iodine prophylaxis were determined during a health education program on iodine deficiency and prophylaxis in 1992. Participants were 472 male and 568 female (mean age 27.7 years) students and employees of five universities in the southern part of Germany. The study aimed to clarify the relationship between personal knowledge on iodine, individual iodine prophylaxis and parameters of iodine deficiency (thyroid volume, iodine excretion) in a well known iodine deficient area. Mean thyroid volume (mean±SD) was 19.7±8.3 ml in males and 15.8±7.1 ml in females. 25.5 % of females and 19.9 % of males showed thyroid volume above the upper normal values. Total mean urinary iodine excretion was 70.7±42 µg I/g creatinine reflecting WHO-grade-I iodine deficiency. 80.8 % of total subjects used iodized salt and 43.2 % stated to consume salt-water fish to meet their iodine requirement. The female non-users had significantly lower iodine excretion (no iodized salt, no salt-water fish: 61.4±31.3 vs. +iodized salt, +salt-water fish: 83.9±47.6 µg I/g creatinine; p〈0.05), however, thyroid volume was identical in these groups. The area of residence over the last 10 years did not significantly influence the thyroid volume. The goiter incidence increased with age. Although our study population was highly educated (81.8 % students) and the subjects were provided with educational brochures immediately prior to the study, knowledge about iodine content of food was poor. We conclude that despite a high degree of voluntary iodine prophylaxis and educational programs the iodine intake is insufficient. The use of iodized salt in households, cafeterias, and also in food manufacturing must be increased for sufficient iodine prophylaxis.
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  • 3
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    European journal of nutrition 35 (1996), S. 32-38 
    ISSN: 1436-6215
    Keywords: Dietary fiber ; dehydroepiandrosterone sulfate ; dehydroepiandrosterone ; 3α-androstanediol glucuronide ; peptide ; steroid metabolism ; Diätetischer Ballaststoff ; Dehydroepiandrosteronsulfat ; Dehydroepiandrosteron ; 3α-Androstendiol glucuronide ; steroidmetabolismus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Es gibt kaum Untersuchungen zu den Auswirkungen einzelner Nahrungskomponenten auf die Plasmaspiegel von Dehydroepiandrosteron (DHEA) und Dehydroepiandrosteron-Sulfat (DHEAS). Insbesondere fehlen Studien zum Einfluß von speziellen Ballaststoffen. Der Effekt von Pektin (ein typischer Ballaststoff mit Wirkung auf die enterohepatische Rezirkulation von Gallensäuren) wurde in 3 aufeinanderfolgenden, jeweils 4tägigen Diätphasen an 6 männlichen Erwachsenen im Rahmen einer randomisierten cross-over-Studie überprüft. Am Ende jeder Diätphase (konstante Nahrungszusammensetzung, Pektinzusatz: 0, 15 bzw. 30 g/die) wurden 24h-Urine gesammelt und venöses Blut entnommen. Die Pektinzulagen führten weder bei DHEA und Cortisol noch beim wichtigsten Plasmabindungsprotein von DHEAS, dem Albumin, zu Veränderungen der Plasmakonzentrationen. Auch blieb die Ausscheidung verschiedener Urin-Analyte (einschließlich des DHEAS) konstant. Allerdings zeigten sich bei 30 bzw. 15 versus 0 g Pektin/die Effekte in bezug auf Plasma-DHEAS (9,3±2,8; 9,2±2,6; 8,0±3,1 µmol/L, p〈0,01) und Plasma-Cholesterin (4,4±0,7; 4,5±0,7; 4,7±0,8 mmol/L, p=0,1). Die Auswirkungen einer veränderten Pektinzufuhr auf zirkulierendes DHEAS und Cholesterin sind also offensichtlich entgegengerichtet. Die Ursache hierfür ist nicht bekannt, allerdings wird eine diätetisch induzierte Änderung der Bindungseigenschaften von Albumin für DHEAS vermutet. Die Befunde deuten an, daß der biologisch aktive, nicht proteingebundene Anteil des zirkulierenden DHEAS (der durch die renale DHEAS-Ausscheidung reflektiert wird) nicht notwendigerweise verändert sein muß, wenn das Gesamt-DHEAS im Plasma variiert.
    Notes: Summary Studies specifically investigating the effects of single dietary components on plasma levels of dehydroepiandrosterone (DHEA) and its sulfate ester (DHEAS) are rare. Especially no data is available with regard to specific dietary fibers. Therefore, the impact of pectin (a representative fiber that affects the enterohepatic recirculation of bile acids) was studied in a randomized crossover trial consisting of three diet periods characterized by the same food supply and daily doses of 0 g, 15 g or 30 g pectin. Blood and 24-h-urine samples were collected at the end of each 4-day diet period from 6 healthy male volunteers. Plasma levels of DHEA, cortisol and the major binding protein of DHEAS albumin remained unchanged with the varying pectin supplements. Also, no changes were observed for several urinary analytes including urinary DHEAS. However, effects of pectin intake (30, 15 versus 0 g/d) were seen for plasma DHEAS (9.3±2.8, 9.2±2.6, 8.0±3.1 µmol/L, p〈0.01) and total plasma cholesterol (4.4±0.7, 4.5±0.7, 4.7±0.8 mmol/L, p=0.1). Obviously, the altered intake of fiber in the form of pectin affects plasma concentrations of DHEAS and cholesterol in an opposite direction. The reason for this is not known but a dietetically induced modulation of the binding properties of plasma albumin for DHEAS appears possible. Our findings suggest that the target tissue-available, not protein-bound fraction of circulating DHEAS (as reflected by the renal DHEAS output) is not necessarily altered when total plasma concentrations of DHEAS vary.
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  • 4
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    European journal of nutrition 35 (1996), S. 57-58 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 5
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    European journal of nutrition 35 (1996), S. 59-119 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 6
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    European journal of nutrition 35 (1996), S. 157-162 
    ISSN: 1436-6215
    Keywords: Empfehlungen zur Nährstoffzufuhr ; historische Entwicklung ; Recommended Dietary Allowances ; historical development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The discovery of the preventive action of lemon juice against scorbut led to a first recommendation on dietary intake in 1753. During the tight economic situation of the following century and in face of the economic crisis after the World War I, several concepts of dietary recommendations developed, all of which primarily served to relieve starvation and hunger and to maintain the ability to work of males. Increasing knowledge of human requirements for essential nutrients led to a clear distinction between dietary standards and health policy recommendations. With their first set of Recommended Dietary Allowances in 1941, especially the American Food and Nutrition Board directed concepts towards the improvement and maintenance of health of all people. National and international work on dietary recommendations took place to an increased extent in the 1970s. In face of currently expanding demands on dietary recommendations at present new directives for the revision of the American Recommended Dietary Allowances are discussed.
    Notes: Zusammenfassung Die Entdekkung der präventiven Wirkung von Zitronensaft gengen Skorbut führte 1753 zu einer ersten Empfehlung zur Nährstoffzufuhr. In den wirtschaftlich angespannten Jahren des folgenden Jahrhunderts und vor dem Hintergrund der Wirtschaftskrise nach dem 1. Weltkrieg entwikkelten sich mehrere Konzepte zu Empfehlungen für die Nährstoffzufuhr, welche primär der Erhalt der Arbeitsfähigkeit der Männer und die Bekämpfung des Hungers zum Ziel hatten. Mit zunehmenden Erkenntnissen zum Bedarf des Menschen an essentiellen Nährstoffen kam es zu einer deutlichen Unterscheidung zwischen bisherigen Empfehlungen und Empfehlungen auf der Basis gesundheitspolitischer Erwägungen. Insbesondere das amerikanische Food and Nutrition Board lenkte mit seiner ersten Ausgabe der Recommended Dietary Allowances 1941 die Ansprüche an die Empfehlungen zur Nährstoffzufuhr in Richtung der Verbesserung und Aufrechterhaltung des Gesundheitszustandes der gesamten Bevölkerung. Seit den 70er Jahren erfolgt eine verstärkte nationale und internationale Arbeit auf dem Gebiet der Nährstoffempfehlungen. Vor dem Hintergrund der wachsenden Anforderungen an die Empfehlungswerte werden derzeit neue Direktiven für die Revision der amerikanischen Recommended Dietary Allowances diskutiert.
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  • 7
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    European journal of nutrition 35 (1996), S. 206-207 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 8
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    European journal of nutrition 35 (1996), S. 199-205 
    ISSN: 1436-6215
    Keywords: α-Amylase Inhibitoren ; lösliches Arabinoxylan ; Roggen ; postprandiale Glykämie ; diabetische Ratten ; Type-II-Diabetiker ; α-amylase-inhibitors ; soluble arabinoxylan ; rye ; postprandial glycemia ; diabetic rats ; type-II-diabetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The protein inhibitor of the α-amylase (D-type) and the soluble arabinoxylan of rye (Var. Clou) were isolated from flour and bran, respectively. The isolation of the α-amylase inhibitor involves the extraction of rye flour in aqueous CaCl2-solution (2 × 10−3M) containing the hemicellulase preparation Veron HE (2 g/100 g flour), dialysis and lyophilization (preparation I) and further fractionation with ammonsulfate, using the fraction 20–50 % for isolation (preparation II). The arabinoxylan isolation is carried out using extraction of rye bran in 80 % ethanol (80 °C), centrifugation, aqueous extraction of the sediment, dialysis and lyophilization (preparation I). The further purification using the precipitate of the fraction 20–50 % leads to preparation II. The α-amylase inhibitor preparation II and the arabinoxylan preparation II were applied in a diet containing wheat starch and casein and fed to diabetic and healthy rats (Levis and Wistar). The postprandial increase of glucose was determined. It was detected that the postprandial increase of glucose is influenced neither by the α-amylase inhibitor nor by the soluble arabinoxylan in comparison to the control experiments. However, the α-amylase inhibitor of wheat significantly decreases the postprandial increase of glucose. The application of a test meal with α-amylase inhibitor of rye to health and diabetic of type-II-volunteers showed no variation of the blood glucose values. The reduction of the increase of glucose by the soluble β-glucan of oat cannot be confirmed for the soluble arabinoxylan of rye. We conclude that the effect of the α-amylase inhibitor as well as the soluble pentosan or glucan has to be examined for each cereal species.
    Notes: Zusammenfassung Aus Roggenmehl und Roggenkleie der Sorte „Clou“ werden der Protein-Inhibitor der α-Amylase und das lösliche Arabinoxylan isoliert. Die Anreicherung des α-Amylase-Inhibitors erfolgt durch Extraktion von Roggenmehl in wässriger CaCl2-Lösung (2 × 10−3M) unter Zusatz des Hemizellulasepräparates Veron HE (2 g/100 g Mehl), anschließende Dialyse und Lyophilisierung (Präparat I). Durch weitere Ammonsulfatfraktionierung und Aufarbeitung der Fraktion 20–50 % Sättigung wird Präparat II gewonnen. Das Arabinoxylanpräparat wird durch Extraktion von Roggenkleie in 80 % Ethanol bei 80 °C, Zentrifugation, wässrige Extraktion des Sedimentes, Dialyse und Lyophilisation gewonnen (Präparat I). Aus dem Extrakt wird Präparat II durch Ethanolfraktionierung und Aufarbeitung der Fraktion 20–50 % isoliert. Das durch Ammonsulfatfraktionierung gereinigte α-Amylase-Inhibitor-Präparat und das durch Ethanolfraktionierung angereicherte Arabinoxylanpräparat werden mit einem Testfutter, bestehend aus Weizenstärke und Casein, an diabetische und stoffwechselgesunde Ratten appliziert und im Blut der postprandiale Glucoseanstieg bestimmt. Es wird nachgewiesen, daß dieser sowohl durch den Inhibitor als auch durch das lösliche Arabinoxylan des Roggens im Vergleich zur Kontrolle nicht beeinflußt wird. Dagegen führte der α-Amylase-Inhibitor des Weizens zu einer signifikanten Verminderung des Glucoseanstiegs. Nach Verzehr einer Testmahlzeit mit zugesetztem α-Amylase-Inhibitor aus Roggen durch Stoffwechselgesunde und Typ-II-Diabetiker kann ebenfalls keine Veränderung der Blutglucosewerte nachgewiesen werden. Somit läßt sich die Senkung des Glucoseanstiegs durch das lösliche β-Glucan aus Hafer mit dem löslichen Arabinoxylan des Roggens nicht bestätigen. Daraus ergibt sich sowohl beim α-Amylase-Inhibitor als auch beim löslichen Pentosan/Glucan die Notwendigkeit, die Wirksamkeit bei jeder Getreideart zu prüfen.
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  • 9
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    European journal of nutrition 35 (1996), S. 235-240 
    ISSN: 1436-6215
    Keywords: Trans fatty acids ; arachidonic acid ; children ; diet ; trans-Fettsäuren ; Arachidonsäure ; Kinder ; Ernährung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Da nachteilige Folgen der Aufnahme von trans-Fettsäuren auf den Lipoproteinstoffwechsel und die Arachidonsäuresynthese bei Kindern befürchtet werden, untersuchten wir den trans-Gehalt in verschiedenen Brotaufstrichen und Brotbelägen, die bevorzugt von Kindern verzehrt werden. Dabei fanden sich die höchsten Gehalte in regulären Margarinen: (4,5; 0,0–10,6; Median der Gewichts-% der Fettsäuren, Minimum-Maximum), Nuß-Nougat-Cremes (5,5; 0,7–11,1 %), Butter 4,7; 3,7–5,2) und Käse (3,6; 1,8–4,0), während Diätmargarinen (0,2; 0,0–0,4), vegetarische Brotaufstriche (0,2; 0,1–0,4), Erdnußbutter (0,0; 0,0–0,3) und Wurst (1,7; 0, 6–6,4) niedrigere Gehalte aufwiesen. Die unterschiedlichen Gehalte führen zu Unterschieden in der aus Diätplänen berechneten täglichen trans-Aufnahme von 〉100 % (3,1 g/d vs. 1,5 g/d) bei 4–7jährigen Kindern. Es erscheint uns sinnvoll, den trans-Fettsäuregehalt von fettreichen Lebensmitteln zu deklarieren, um dem Verbraucher eine gezielte Auswahl zu ermöglichen, und eine Minderung der Bildung von trans-Fettsäuren bei der technischen Fetthärtung anzustreben.
    Notes: Summary A high intake of trans fatty acids in children may be disadvantageous because of untoward effects on lipoprotein metabolism and a possible impairment of arachidonic acid synthesis. We measured the trans fatty acid content of different brands of spreads and cold cuts typically consumed by German children because these foods may contribute a considerable portion of total trans fatty acid intake. The highest trans fatty acid contents were found in regular margarines (4.5, 0.0–10.6; median %-wt/wt of fatty acids, minimal-maximal), chocolate spreads (5.5, 0.7–11.1), butter (4.7, 3.7–5.2) and cheese (3.6, 1.8–4.0), while lower values were present in diet margarines (0.2, 0.0–0.4), vegetarian spreads (0.2, 0.1–0.4), peanut butter (0.0, 0.0–0.3) and sausages (1.7, 0.6–6.4). Calculations of typical dietary plans for young children show that food selection and variations in trans fatt acid contents may lead to marked differences in daily trans intake of 〉100 % (3.1 g/d vs. 1.5 g/d). We propose that trans fatty acid content should be declared on labels of fatty food products to enable the consumer to choose, and further attempts should be made to lower trans fatty acid formation during technical hydrogenation.
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  • 10
    ISSN: 1436-6215
    Keywords: Fatty liver ; isomeric octadecenoic acids ; oleic acid ; petroselinic acid ; coriander oil ; Fettleber ; Isomere Octadecensäuren ; Ölsäure ; Petroselinsäure ; Korianderöl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung In verschiedenen Studien wird eine günstige Wirkung von Pflanzenölen mit hohem Anteil an einfach ungesättigten Fettsäuren, z.B. Ölsäure (cis-9-Octadecensäure), auf die Gesundheit beschrieben. Kürzlich haben wir gezeigt, daß die Fütterung von Ratten mit Korianderöl, das hohe Anteile eines Positionsisomers der Ölsäure enthält, nämlich Petroselinsäure (cis-6-Octadecensäure), zu einer signifikanten Erniedrigung der Arachidonsäure (allcis-5,8,11,14-Eicosatetraensäure)-Anteile in den zellulären Lipiden führte. Hier berichten wir über histopathologische Befunde an männlichen Wistar-Ratten, denen isokalorische Diäten mit 2 % Maiskeimöl und jeweils 12 % (w/w) Pflanzenöl (ölsäure-reiches oder konventionelles Sonnenblumenöl, Olivenöl, Rapsöl, Korianderöl) und unterschiedlichen Anteilen an isomeren Monoenfettsäuren, d.h. Öl- und Petroselinsäure, verabreicht wurden. Die Tiere der Kontrollgruppe erhielten eine Standarddiät mit 4 % (w/w) Fett. Leber, Herz, Aorta, Magen und Milz wurden anatomisch und histologisch untersucht. Die Lebern der Tiere aller Gruppen, die eine fettreiche Diät erhalten hatten — mit Ausnahme der Korianderöl-Gruppe —, entwickelten eine mäßige, nicht-degenerative Fettinfiltration der Hepatocyten, die in den Periportalfeldern einsetzte. Eine ausgeprägte bis schwere Fettinfiltration wurde dagegen in den Hepatocyten von Tieren gefunden, die mit petroselinsäurereichem Korianderöl gefüttert worden waren. In dieser experimentellen Gruppe enthielten die Lebern Fettzysten und Lipidvesikel unterschiedlicher Größe. Außerdem wurden vergrößerte Kerne in zahlreichen Hepatocyten beobachtet, die keine Fettinfiltration aufwiesen. In Ratten, die mit einer Standarddiät gefüttert worden waren, wurde dagegen keine Fettinfiltration in den Leberzellen gefunden. Die Zellen aller anderen untersuchten Organe und Gewebe, insbesondere Herz und Aorta, zeigten weder nicht-degenerative Fettinfiltrationen noch irgendwelche anderen degenerativen Veränderungen. Unsere Ergebnisse zeigen, daß die Fütterung fettreicher Diäten mit unterschiedlichen C18 cis-Monoenfettsäuren in Abhängigkeit von der Position der Doppelbindung unterschiedliche histopathologische Veränderungen in der Leber von Ratten hervorruft. Während Pflanzenöle mit variierenden Ölsäureanteilen ausschließlich zu mäßigen Fettinfiltrationen in den Hepatocyten führten, wurden in den Lebern der mit petroselinsäurereichem Korianderöl gefütterten Tiere degenerative Veränderungen (Fettzysten) sowie — in einigen Fällen — vergrößerte Zellkerne beobachtet, die auf eine unspezifische Stimulierung der Hepatocyten hindeuten.
    Notes: Summary Beneficial effects on health parameters by ingestion of plant oils having high levels of monounsaturated fatty acids such as oleic (cis-9-octadecenoic) acid have been described in several studies. Recently, we have shown that feeding of coriander oil containing high proportions of a positional isomer of oleic acid, i.e. petroselinic (cis-6-octadecenoic) acid, led to significantly decreasing proportions of arachidonic (allcis-5,8,11,14-eicosatetraenoic) acid in the cellular lipids. Here, we report histopathological findings in male Wistar rats fed isocaloric diets containing 2 % corn oil and 12 % (w/w), each, of different plant oils (high-oleic and conventional sunflower oil, olive oil, rapeseed oil as well as coriander oil) containing varying levels of monounsaturated fatty acids, i.e. oleic or petroselinic acids. One group of animals was fed a standard diet containing 4 % (w/w) of fat as control. Liver, heart, aorta, stomach, and spleen were anatomically and histologically examined. Livers of animals from all the groups that had received high-fat diets — except the coriander oil group — showed moderate non-degenerative fat infiltrations of the hepatocytes beginning in the periportal fields. Marked to severe fat infiltration was observed in hepatocytes of animals fed coriander oil. In this experimental group the livers were found to contain fatty cysts in addition to hepatocytes with mixed-size lipid vesicles. Moreover, enlarged nuclei were observed in numerous hepatocytes without fat infiltration. Fat infiltration was not observed in livers of animals fed a rat standard diet. In the cells of all other organs and tissues studied, in particular heart and aorta, neither non-degenerative fat infiltrations nor other degenerative changes were observed for any group. Our results show that feeding of fat-rich diets containing varying proportions of C18 cis-monoenoic fatty acids induced different histopathological alterations in the livers of rats, depending on position of the double bond. Plant oils containing varying proportions of oleic acid lead exclusively to moderate fat infiltration in the hepatocytes, whereas in the animals fed high-petroselinic coriander oil degenerative alterations (fatty cysts) as well as — in several cases — enlarged nuclei were found that are likely due to a non-specific stimulation of the hepatocytes resulting from the cell degeneration observed.
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  • 11
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    European journal of nutrition 35 (1996), S. 259-265 
    ISSN: 1436-6215
    Keywords: Diet ; serum cholesterol ; serum triglycerides ; HDL-cholesterol ; LDL-cholesterol ; Apo B ; hyperlipoproteinaemia ; nonsmokers ; Diät ; Cholesterinspiegel ; Serumtriglyceride ; HDL-Cholesterin ; LDL-Cholesterin ; Apo B ; Hyperlipoproteinämie ; Nichtraucher
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Die Absicht dieser Studie war es, die Prävalenz der veränderten Serumspiegel von Lipiden, Lipoproteinen und Apolipoproteinen (Apo) B bei 169 spanischen, männlichen, sehr aktiven Nichtrauchern im Alter von 20 bis 65 Jahren, die Sonnenblumenöl verzehren, zu erforschen. Die Serumwerte, die für Cholesterin (TC), Triglyceride (TG), LDL-Cholesterin und für den TC/HDL-Cholesterin-Quotient erhalten wurden, waren altersbedingt unterschiedlich. Ein detailliertes Ernährungsprotokoll über einen Zeitraum von 12 Tagen zeigte, daß die Diät der Probanden typisch mediterran war, mit der Ausnahme des Verzehrs von Sonnenblumenöl — statt Olivenöl. Der Beitrag von gesättigten, einfach-und mehrfach ungesättigten Fettsäuren zur gesamten Kcal-Aufnahme war je 9,9 %, 12,7 % und 8,8 %. Der Index Cholesterin/gesättigtem Fett in der Diät betrug im Mittel 19,2 per 1 000 Kcal, während der Keys-Index der Diät 27,1 war. Die tägliche Aufnahme an Ballaststoffen, Ascorbinsäure und Vitamin E betrug jeweils 25,1 g, 89,6 mg und 28,3 mg. Der Kalzium/Magnesium-Quotient betrug 1,54. Der niedrige Anteil an Männern mit hohem Cholesterinspiegel (5,4 % mit TC ≥6,49 mmol/L), hohen TG-Werten (3,7 % mit TG ≥2,25 mmol/L), hohen Apo B-Werten (3,0 % mit ≥1,5 g/L), niedrigen HDL-Cholesterin-Werten (0,7 % mit ≤0,91 mmol/L), hohen LDL-Cholesterin-Werten (1,4 % mit ≥4,94 mmol/L) oder mit einem hohen Wert des TC/HDL-Cholesterin-Quotienten (2,8 % mit ≥5,0) läßt einen ausreichenden Schutz gegen zukünftige koronare Herzleiden erwarten.
    Notes: Summary The aim of this study was to assess the prevalence of altered levels of serum lipids, lipoproteins and apolipoprotein (Apo) B in very active, 20 to 65 year-old, Spanish male nonsmokers who consumed sunflower oil. Among the 169 participants, total serum cholesterol (TC), triglycerides (TG), LDL-C, and TC/HDL-C were found to be age-dependent variables. A detailed study over a 12-day period showed that this population displayed a Mediterranean dietary pattern, with the exception of the substitution of sunflower for olive oil. Saturated, monounsaturated and polyunsaturated fatty acids represented 9.9 %, 12.7 % and 8.8 % of the total amount of energy, respectively. The cholesterol-saturated fat index of the average diet was 19.2 per 1 000 kcal, whereas the Keys index of the diet was 27.1. Daily intakes of fibre, ascorbic acid and vitamin E were 25.1 g, 89.6 mg and 28.3 mg, respectively. The calcium/magnesium ratio of the average diet was 1.54. The low percentage of individuals with high TC levels (5.4 % with TC ≥6.49 mmol/L), high TG levels (3.7 % with TG ≥2.25 mmol/L), high Apo B levels (3.0 % with ≥1.5 g/L), low levels of HDL-C (0.7 % with ≤0.91 mmol/L), high LDL-C levels (1.4 % with ≥4.94 mmol/L or a high TC/HDL-C ratio (2.8 % with ≥5.0) suggest a reasonable protection against coronary heart disease in this Spanish population.
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  • 12
    ISSN: 1436-6215
    Keywords: Vitamin B6 ; Gravidität ; Laktation ; Ratten ; Aspartat-Aminotransferase ; Alanin-Aminotransferase ; Vitamin B6 ; gravidity ; lactation ; rats ; aspartate-aminotransferase ; alanin-aminotransferase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Eighty female Sprague-Dawley rats weighing 257 g were fed during gravidity a semi-synthetic diet containing five vitamin-B6-treatment groups (0.6, 3, 6, 18 and 180 mg/kg diet). The daily food intake was 14 g. During the following lactation the rats of each treatment group were divided into two groups containing 3 and 6 mg vitamin B6. At the 14th day of lactation the dams were decapitated. Parameters for determination of the vitamin-B6-status were activity of AST and ALT in plasma, erythrocytes and liver. The average activity of AST in plasma was 549 U/l, in erythrocytes 1 939 U/l and liver 106 U/g fresh matter (FM). The increasing vitamin-B6-supplementation during gravidity resulted in an elevated activity of AST between lowest and highest treatment group in plasma 56 %, erythrocytes 44 %, and in liver 43 %, respectively. In response to the increasing vitamin-B6-treatment during lactation the activity of AST in plasma increased for 19 %, in erythrocytes for 13 %, and in liver for 24 %, respectively. A low vitamin-B6-supply (0.6 mg/kg diet) during gravidity in combination with demand-oriented supply during lactation (6 mg/kg diet) initiated the highest increase of activity. A deficient vitamin-B6-supply during lactation (3 mg/kg diet) could be compensated with optimal vitamin-B6-supply during gravidity. The values of ALT-activity showed no significant differences between the graded vitamin-B6-supplements, as a result of a high coenzyme saturation.
    Notes: Zusammenfassung 80 weibliche Sprague-Dawley-Ratten mit einem mittleren Deckgewicht von 257 g erhielten während der Gravidität eine semisynthetische Diät mit fünf verschiedenen Vitamin-B6-Zulagestufen von 0,6; 3; 6; 18 und 180 mg/kg Diät. Die tägliche Futtermenge betrug 14 g pro Tier. Mit Beginn der Laktation wurden die Tiere jeder Zulagestufe auf die zwei Zulagestufen 3 mg und 6 mg Vitamin B6/kg Diät verteilt und das Futter ad libitum angeboten. Am 14. Tag der Laktation wurden die Tiere dekapitiert. Der Vitamin-B6-Status der Ratten wurde anhand der Aktivitäten der Aspartat-Amino-transferase (AST) und der Alanin-Aminotransferase (ALT) im Plasma, den Erythrozyten und der Leber bestimmt. Die Aktivität der AST im Plasma am 14. Tag der Laktation lag im Durchschnitt bei 549 U/l, in den Erythrozyten bei 1 939 U/l und in der Leber bei 106 U/g FM. Die ansteigenden Vitamin-B6-Zulagen während der Gravidität verursachten im Plasma zwischen der geringsten und der höchsten Zulage eine Erhöhung der Aktivität um 56 %, in den Erythrozyten um 4 % und in der Leber um 43 %. Die Erhöhung der Vitamin-B6-Zulage während der anschließenden Laktation bewirkte eine Zunahme im Plasma im Mittel um 19 %, in den Erythrozyten um 13 % und in der Leber um 24 %. Überproportionale Aktivitätserhöhungen ergaben sich bei einer defizitären Zulage (0,6 mg Vitamin B6/kg Diät) während der Gravidität und anschließend bedarfsgerechter Versorgung (6 mg Vitamin B6/kg Diät) während der Laktation. Eine suboptimale Vitamin-B6-Versorgung (3 mg Vitamin B6/kg Diät) während der Laktation konnte durch vorangegangene bedarfsgerechte Versorgung während der Gravidität ausgeglichen werden. Die Ergebnisse der Aktivitätsmessungen der ALT zeigten keine signifikanten Einflüsse der alimentären Vitamin-B6-Versorgung, was durch eine höhere Coenzymabsättigung erklärt werden kann.
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  • 13
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    European journal of nutrition 35 (1996), S. 302-305 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 14
    ISSN: 1436-6215
    Keywords: Thiamin ; Riboflavin ; Pantothensäure ; praecaecale Verdaulichkeit ; Verfügbarkeit ; Ileorectalanastomose ; Thiamin ; riboflavin ; pantothenic acid ; precaecal digestibility ; availability ; ileorectalanastomosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary The aim of the present investigations was to produce results about precaecal digestibility of naturally occurring thiamin, riboflavin and pantothenic acid from corn, wheat bran and dried skimmilk. Precaecal digestibility is used as a quantitative measure for availability and was determined in ileorectomized growing pigs. Therefore, 6 female DL-pigs with a liveweight of about 30 kg were fitted with ileorectalanastomosis as end-to-side-anastomosis with preserved ileo-caeco-colic valve. The metabolism trials to collect the chymus quantitatively with these animals were carried out from the third week until 9 weeks after surgery in the liveweight range of about 40–70 kg. Precaecal digestibilities from corn, wheat bran and dried skimmilk were for thiamin 87, 91 and 96 %, respectively, with all values being significantly different. Riboflavin was 67, 62 and 94 % precaecally digestible, the significantly different values for pantothenic ranged from 20 to 47 and 90 %. “Availability” of native thiamin was higher than of riboflavin and pantothenic acid, which showed the lowest value of about 50 %. The availability of the vitamins from the animal product was significantly higher than from vegetable products. The suitability of the method is discussed.
    Notes: Zusammenfassung Die vorliegenden Untersuchungen dienten dazu, Ergebnisse zur praecaecalen Verdaulichkeit von nativem Thiamin, Riboflavin und Pantothensäure aus Mais, Weizenkleie und Magermilchpulver zu liefern. Die praecaecale Verdaulichkeit, als quantitatives Maß für die Verfügbarkeit, wurde an ileorectostomierten Schweinen ermittelt. Dazu wurden bei 6 wachsenden weiblichen DL-Schweinen beim Lebendgewicht von etwa 30 kg auf chirurgischem Weg Ileorectalanatomosen in Form der End-zu-Seit-Anastomosen mit Erhalt der Ileocaecalklappe hergestellt. Die Stoffwechselversuche mit quantitativer Chymussammlung wurden ab etwa der 3. Woche bis 9 Wochen nach der Operation im Gewichtsbereich der Tiere von 40–70 kg durchgeführt. Die praecaecale Verdaulichkeit aus Mais, Weizenkleie und Magermilchpulver betrug für Thiamin 87 %, 91 % und 96 % (jeweils signifikant verschieden), für Riboflavin 67, 62 und 94 % und für Pantothensäure 20, 47 und 90 %. Damit war die „Verfügbarkeit“ von natürlichem Thiamin deutlich höher als von Riboflavin; Pantothensäure wies mit etwa 50 % den signifikant schlechtesten Wert auf. Das tierische Produkt stellte im Vergleich zu den pflanzlichen Komponenten die Vitamine deutlich am besten zur Verfügung. Die Eignung der Methodik für Verfügbarkeitsstudien wird diskutiert.
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  • 15
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    European journal of nutrition 35 (1996), S. 1-1 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 16
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    European journal of nutrition 35 (1996), S. 39-44 
    ISSN: 1436-6215
    Keywords: Dietary fibers ; agro industrial wastes ; serum lipids ; liver lipids ; Diäterische Fasern ; industrielle Agrarabfälle ; Serumlipide ; Leberlipide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Albino-Ratten wurden für 8 Wochen 3 Diäten unterworfen. Diät I bestand aus nicht-faseriger hoch-halliger Kohlenhydratkostform. Diät II und Diät III enthielten zusäzlich 100 g/kg mitEndomycopsis fibuligera kultivierte faserige Dattelabfälle. Die Kultivierungszeit betrug 0 (II) und 60 Stunden (III). Die Gesamtlipide, das Gesamtcholesterol, die Triglyzeride und die Phospholipide nahmen in den Lebern der Ratten, die mit Diät II und III gefüttert wurden, deutlicher ab, als bei denjenigen, die mit Diät I gefüttert wurden. Bei der Diät III zeigte sich die höchste Abnahme der verschiedenen Untersuchungsparametern. Vergleicht man Diät II und III mit Diät I, so ergibt sich, daß die Serumgesamtlipide und das Lipoprotein-Cholesterol niedrigerer Dichte (LDL-Cholesterol) um 32–48 % abnehmen, während Serumtriglyzeride und Gesamtcholesterol in mit Dät II und Diät III gefütterten Ratten um 23–35 % erniedrigt sind. Bei mit Diät II und III gefütterten Ratten betrug die Abnahme des HDL-Cholesterols nur 2–6 %. Phospholipide zeigten die höchste Abnahme (51–56 %) während der ganzen Versuchsperiode (8 Wochen).
    Notes: Summary Date waste dietary fibers were examined as a hypolipidemic agent. White albino rats were fed on three experimental diets: I) high carbohydrate diet free of fiber; II) and III) diets consisted of diet I substituted with 100 g/kg of date waste dietary fibers cultured withEndomycopsis fibuligera at zero time and after 60 h of culturing respectively for 8 weeks. The total lipids, total cholesterol, triglycerides and phospholipids in the liver of rats given diets II and III were significantly decreased over those rats fed the control diet throughout the feeding period (8 weeks). The highest decrease in content of all these parameters was produced by diet III. Comparing diets II and III with the control diet I, total serum lipids and low density lipoprotein cholesterol (LDL-cholesterol) were decreased by 32–48 %, while serum triglycerides and total cholesterol levels were lowered in the groups fed diets II and III by 23–35 % respectively. Concerning high density lipoprotein cholesterol (HDL-cholesterol), the decrease was only 2–6 % in rats fed diets II and III. The highest decrease level was shown in the phospholipids content (51–56 %) during all of the experimental period (8 weeks).
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  • 17
    ISSN: 1436-6215
    Keywords: Energie- und Nährstoffaufnahme ; Trends ; Bedeutung einzelner Lebensmittel-gruppen ; Modellstudie ; neue Bundesländer ; Intake of energy and nutrients ; trends ; importance of several food groups ; model study ; new German States
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary A nutritional model study was carried out in Potsdam from December 1990 until December 1991 involving 222 persons at the beginning. Changes of the energy and nutrient intake were evaluated. The trends established in 1991 — demonstrated by means of two specific trend parameters — have been discussed with regard to the results of the nutritional situation in the former GDR. First signs for an improvement of nutritional situation were visible (e.g., increase of consumption of vitamin A, ascorbic acid and calcium as well as decrease of consumption of energy and cholesterol).
    Notes: Zusammenfassung Eine von Ende 1990 bis Ende 1991 in Potsdam durchgeführte Modellstudie an anfangs 222 Personen wurde unter dem Aspekt von Veränderungen der Energie- und Nährstoffaufnahme ausgewertet. Die für 1991 ermittelten Trends — dargestellt durch 2 spezifische Trendparameter — wurden unter Beachtung von Ergebnissen über die Ernährungssituation in der ehemaligen DDR diskutiert. Ansätze zu einer Verbesserung der Ernährungssituation wurden sichtbar (z.B. Verzehrszunahmen bei Vitamin A, Vitamin C und Calcium sowie -abnahmen bei Energie und Cholesterin).
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  • 18
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    European journal of nutrition 35 (1996), S. 210-211 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 19
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    European journal of nutrition 35 (1996), S. 213-225 
    ISSN: 1436-6215
    Keywords: Maillard-Reaktionsprodukte ; Glycosylierung, enzymatischer Abbau ; Melanoidine ; Verdauungsenzyme ; Maillard reaction products ; glycosylation ; enzymatic degradation ; melanoidins ; digestive enzymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary In this article current knowledge about the Maillard reactionin vivo is described first, especially the glycosylation reactions of various tissues and the identification of different final products and intermediates of Maillard reaction. The influence of MRP on digestion is of significant importance. These products are absorbed in different ways and are excreted in various amounts. Hence, the organism is variably influenced by MRP. The influence of defined MRP, of glycosylated proteins and of melanoidines on glycosidases and proteases is described. The effects produced depend on the enzyme and on the used MRP. Reactive α-dicarbonyl compounds play an important role in the organism. Further possible reactions of these compounds caused by reductases are discussed. The protein structure of enzymes is changed by Maillard reaction. Thereby the enzyme activity is influenced by covalent modifications of different amino acids and by inter- and intramolecular crosslinking. Finally, the use of enzymes and monoclonale antibodies for detection of MRP is discussed.
    Notes: Zusammenfassung Im vorliegenden Artikel werden zunächst ausgewählte Kenntnisse zur Maillard-Reaktionin vivo vorangestellt, wobei Glycosylierungsreaktionen von verschiedenen Geweben sowie das Auffinden verschiedener Intermediate und Folgeprodukte der Maillard-Reaktion skizziert werden. Einen besonderen Schwerpunkt bildet der Einfluß von MRP auf die Verdauung. MRP werden in unterschiedlichem Maße resorbiert und ausgeschieden und beeinflussen demzufolge den Organismus in vielfältiger Weise. Die Wechselwirkungen definierter MRP, glycosylierter Proteine und Melanoidine mit Glycosidasen und Proteasen werden beschrieben. Die dadurch ausgelösten Effekte sind sowohl vom untersuchten Enzym als auch vom eingesetzten MRP abhängig. Im Organismus kommt den α-Dicarbonylverbindungen (Ketoaldehyde), wie sie auch als Schlüsselverbindungen im Verlauf der Maillard-Reaktion auftreten, eine besondere Bedeutung zu. Die Möglichkeiten der Umsetzung dieser Verbindungen durch Reductasen wird vorgestellt. Struktur und Aktivität von Enzymen werden durch die Maillard-Reaktion dieser Funktionsproteine mit reduzierenden Kohlenhydraten beeinflußt. Durch kovalente Modifizierung proteingebundener Aminosäuren sowie durch inter- und intramolekulares cross linking kann sich die Enzymaktivität verändern. Schließlich wird der Einsatz von Enzymen und monoklonalen Antikörpern zum Nachweis von definierten MRP angesprochen.
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  • 20
    ISSN: 1436-6215
    Keywords: Hippocampus ; CA1 pyramidal neurone ; spines ; ethanol ; thiamine ; Hippocampus ; CA1 Pyramidenzelle ; dendritische Dornen ; Ethanol ; Thiamin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung In einer 5monatigen Versuchsperiode wurden ethanolinduzierte Schäden an den dendritischen Dornen der CA1-Pyramidenzellen des Hippocampus männlicher Wistarratten auf morphologischer Ebene dokumentiert. Die zentralnervösen Alterationen spiegeln sich nach täglicher Ethanolapplikation mit dem Trinkwasser und Thiamingaben in Höhe der 3fachen alimentären Empfehlung (1,19 mg/100 g Futter) in einer signifikanten Dornenvergrößerung (gemessene Parameter: Dornenlänge und Durchmesser des Dornenkopfes) wider. Die Dornenhypertrophie ist als neuronaler Kompensationseffekt zu interpretieren, der als Folge eines alkoholbedingten Zelltodes auftritt: Überlebende Neurone protrahieren ihre Dornen auf der Suche nach neuen synaptischen Kontakten zur Erhaltung des ‚neuronalen Kreislaufs‘. Demgegenüber weisen die dendritischen Dornen alkoholbehandelter Tiere, denen gleichzeitig hochdosierte Thiamingaben (119 mg/100 g Futter) verabreicht wurden, normale Längen und Durchmesser ihrer Endköpfe auf. Möglicherweise kann Thiamin durch die Aufrechterhaltung des neuronalen Kohlenhydratstoffwechsels alkoholinduzierte Degenerationen am zentralen Nervensystem der Ratte verhindern.
    Notes: Summary The specific aim of this study was to evaluate whether high doses of thiamine can compensate or prevent alcohol-induced damages of rat hippocampus CA1 pyramids. Twenty weeks of ethanol consumption together with a dose of thiamine in the range of 1.19 mg/100 mg food induced significant enlargement (parameters measured were length of the whole spine and diameter of the end-bulb) of dendritic spines. Hypertrophy can be interpreted as a compensation process due to alcohol-induced cell death because viable spines are in search of new synaptic contacts. In contrast, dendritic spines of the alcohol group fed at the same time with a high dose of thiamine (119 mg/100 g food=megavitamintherapy) showed normal data concerning these parameters. From these results it may be concluded that a megavitamin therapy supports a neuron's carbohydrate metabolism and therefore could be able to prevent or reduce alcohol-induced damages of hippocampal CA1 pyramidal cells in rat central nervous system.
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  • 21
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    European journal of nutrition 35 (1996), S. 288-291 
    ISSN: 1436-6215
    Keywords: Copper deficiency ; rat ; thyroxine ; triiodothyronine ; 5′Monodeiodinase ; Kupfermangel ; Ratte ; Thyroxin ; Triiodthyronin ; 5′Monodeiodase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Ziel der vorliegenden Arbeit war es, den Einfluß von Kupfermangel auf den Stoffwechsel der Schilddrüsenhormone bei der Ratte zu untersuchen. Dazu wurde ein Versuch mit männlichen wachsenden Sprague-Dawley-Ratten durchgeführt. Der Versuch beinhaltete zwei Gruppen, die entweder eine Kupfermangeldiät (0,06 mg Cu/kg) oder eine Kontrolldiät (16 mg Cu/kg) erhielten. Die Ratten beider Gruppen erhielten dabei durch ein Pair-feeding Regime identische Futtermengen. Die Tiere der Kupfermangelgruppe waren zu Versuchsende um 5 % leichter als die der Kontrollgruppe. Die Kupfermangeltiere hatten darüber hinaus eine stark verminderte Aktivität des Ceruloplasmins im Serum (um 97 %) sowie veränderte hämatologische Parameter, was einen starken Kupfermangel bei diesen Tieren belegte. Zur Abschätzung des Stoffwechsels der Schilddrüsenhormone wurden die Konzentrationen des gesamten und des freien Thyroxins (T4) und des Triiodthyronins (T3) im Serum sowie die Aktivität der 5′ Monodeiodase (5′D) in der Leber bestimmt. Die Kupfermangeltiere hatten eine erhöhte Konzentration an T3 im Serum, während sowohl die Konzentration an freiem und am gesamten T4 als auch die Aktivität der 5′D in der Leber nicht verändert waren. Insgesamt zeigt die vorliegende Untersuchung, daß auch sehr starker Kupfermangel nur geringfügige Änderungen des Stoffwechsels der Schilddrüsenhormone bei wachsenden Ratten verursacht.
    Notes: Summary The aim of the present study was to investigate the effect of copper deficiency on thyroid hormone metabolism in rats. Therefore, an experiment with growing male Sprague-Dawley rats was carried out, consisting of two groups of rats fed either a copper-deficient (0.06 mg Cu/kg) or a copper-adequate diet (16 mg Cu/kg). Both groups of rats were fed identical quantities of diet by pair-feeding. Copper deficiency decreased the final body weight of the rats by 5 % compared to copper-adequate control rats. A severe copper-deficient state in the rats fed the copper-deficient diet was proved by a large decrease of ceruloplasmin activity in serum (by 97 %) and hematological changes. For estimation of thyroid hormone metabolism, the concentrations of total and free thyroxine (T4) and triiodothyronine (T3) in serum and the activity of hepatic 5′ monodeiodinase (5′D) were determined. Copper-deficient rats had an increased concentration of T3 in serum, whereas the concentrations of total and free T4 as well as the activity of hepatic 5′D were not different compared with copper-adequate control rats. Therefore, the study shows that copper deficiency has only slight effects on thyroid hormone metabolism in growing rats.
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  • 22
    ISSN: 1436-6215
    Keywords: Vitamin-B6-Status ; Pyridoxin ; Pyridoxamin ; Pyridoxamin ; Laktation ; Ratte ; Vitamin B6 status ; pyridoxine ; pyridoxal ; pyridoxamine ; lactation ; rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Eighty female Sprague-Dawley rats were fed a semisynthetic diet during gravidity which was supplemented with 5 mg vitamin B6 per kg diet. The daily food intake was 14 g. During the following lactation the rats were assigned to one of 10 vitamin B6 treatment groups (0, 3, 6, 9, 12, 15, 18, 36, 360 and 3 600 mg per kg diet). The feed was given ad libitum. At day 14 of lactation the rats were decapitated. Parameters for determination of the vitamin B6 status were concentration of pyridoxine, pyridoxal and pyridoxamine in liver and body analyzed by using HPLC. Body was defined without the gastroenteral tract that was divided into carcass (extrahepatical compartments without liver) and total body (extrahepatical compartments plus liver). The mean weight of liver was 13 g with a dry mass of 33 %; there was no difference between the treatment groups. The vitamin B6 concentration was lowest in rats fed 0 mg vitamin B6/kg diet (5 µg/g fresh matter, FM) and highest in the rats fed 3 600 mg vitamin B6/kg diet (10.9 µg/g FM). The total vitamin B6 consisted on the average of 38 % pyridoxal and 62 % pyridoxamine. This was only changed significantly at the highest supplementation level, where 20 % pyridoxine were detected instead of pyridoxamine. The mean weight of carcass averaged 212 g at a dry matter content of 31 %. The vitamin B6 concentration ranged in the treatment groups from 0 mg to 360 mg vitamin B6/kg diet between 2.1 µg/g FM and 2.8 µg/g FM. It was highest in the 3 600 mg vitamin B6 treatment group at 7.5 µg/g FM. The total vitamin B6 consisted of 63 % pyridoxal and 37 % pyridoxamine. It was only significantly affected in the 3 600 mg vitamin B6 treatment group, where also pyridoxine could be found in the amount of 56 %. The results indicate that alimentary vitamin B6 supply had more influence on liver vitamin B6 concentration than on carcass concentration. Total body concentration is very similar as carcass concentration, as 95 % of vitamin B6 is located there. The suitability of the parameters for the evaluation of the vitamin B6 requirement was confirmed by the comparison of two statistical methods. It is concluded that a vitamin B6 supply of 5 to 6 mg/kg diet is necessary to meet the requirements during lactation.
    Notes: Zusammenfassung 80 weibliche Sprague-Dawley Ratten erhielten während der Gravidität eine semisynthetische Diät mit einer Zulage von 5 mg Vitamin B6/kg Diät. Die tägliche Futteraufnahme betrug 14 g pro Tier. Für den Zeitraum bis zum 14. Tag der Laktation wurden je acht Tiere mit insgesamt zehn verschiedenen Vitamin-B6-Zu-lagestufen versorgt (0, 3, 6, 9, 12, 15, 18, 36, 360 und 3 600 mg/kg Diät). Das Futter wurde ad libitum vorgelegt. Am 14. Tag der Laktation wurden die Tiere dekapitiert. Als Parameter zur Bestimmung des Vitamin-B6-Status wurden die Konzentrationen von Pyridoxin, Pyridoxal und Pyridoxamin in der Leber und im Körper mittels HPLC bestimmt. Als Körper wurde der vom Magen-Darm-Trakt befreite Tierkörper bezeichnet, der in Restkörper (extrahepatische Kompartimente ohne Leber) und Gesamtkörper (extrahepatische Kompartimente plus Leber) unterteilt wurde. Das Organgewicht der Leber war über alle Zulagestufen gleich und betrug im Durchschnitt 13 g bei einem Trockensubstanzgehalt von 33 %. Die Vitamin-B6-Konzentration bewegte sich zwischen 5,0 µg/g Frischmasse (FM) in der niedrigsten Zulagestufe und 10,9 µg/g FM in der höchsten Zulagestufe. Das Gesamtvitamin B6 setzte sich im Durchschnitt aus 38 % Pyridoxal und 62 % Pyridoxamin zusammen und war nur in der höchstdosierten Zulagestufe durch einen Anteil von 20 % Pyridoxin zuungunsten von Pyridoxamin signifikant verschoben. Das Restkörpergewicht zeigte keine Unterschiede zwischen den Vitamin-B6-Zulagestufen und lag im Durchschnitt bei 212 g, bei einem Trockensubstanzgehalt von 31 %. Die Vitamin-B6-Konzentration bewegte sich in den Zulagestufen 0 bis 360 mg Vitamin B6/kg Diät in einem kleinen Intervall zwischen 2,1 µg/g FM und 2,8 µg/g FM, bei einer Zulage von 3 600 mg/kg Diät ergab sich eine signifikante Erhöhung auf 7,5 µg/g FM. Die Zusammensetzung des Gesamtvitamins bestand im Durchschnitt zu 63 % aus Pyridoxal und zu 37 % aus Pyridoxamin und zeigte sich nur in der hochdosierten Zulagestufe durch einen Anteil von 56 % Pyridoxin zuungunsten von Pyridoxal und Pyridoxamin signifikant verändert. Insgesamt zeigte sich die Vitamin-B6-Konzentration der Leber als leichter durch die alimentäre Versorgung zu beeinflussen. Die quantitativ größte Menge an Vitamin B6, lokalisiert im Restkörper, stellte sich als schwerer zu beeinflussen heraus. Im Gesamtkörper ergaben sich ähnliche Verhältnisse wie im Restkörper, der etwa 95 % des Vitamin-B6-Bestandes enthält. Anhand zweier mathematischer Modelle wurde eine statistische Bedarfsableitung durchgeführt und die generelle Eignung der Parameter für die Bedarfsableitung überprüft. Aufgrund der Ergebnisse ergibt sich während der Laktation bei Verwendung der beschriebenen Diät eine bedarfsgerechte Vitamin-B6-Versorgung bei 5 bis 6 mg pro kg Diät.
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  • 23
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 24
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    European journal of nutrition 35 (1996), S. 309-317 
    ISSN: 1436-6215
    Keywords: Vitamin B6 ; Schwangerschaft ; Laktation ; Gehirnentwicklung ; Dendriten ; Neurotransmitter ; Krampfanfälle ; Rattenmodell ; Mensch ; Vitamin B-6 ; dietary ; intake ; pregnancy ; lactation ; brain development ; dendrites ; neurotransmitter synthesis ; seizures ; animals ; humans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Vitamin B-6 is an important coenzyme in the biosynthesis of the neurotransmitters GABA, dopamine and serotonin and is therefore required for the normal perinatal development of the central nervous system. In rat studies, biochemical and morphological abnormalities (decreased dendritic arborization and reduced numbers of myelinated axons and synapses) in the brains of pups from vitamin B-6 deficient dams were associated with behavioral changes such as epileptiform seizures and movement disorders. In severely vitamin B-6 deficient human infants, similar behavioral abnormalities have been described. Marginally deficient neonates were found to have a lower birthweight and to display less mature reactive and adaptive behavior in the Brazleton Neonatal Assessment Scale than well-fed infants. While it is not yet possible to define the exact amount of vitamin B-6 required to support optimal brain development, pregnant and lactating women should be encouraged to consume a diet that is rich in vitamin B-6.
    Notes: Zusammenfassung Vitamin B6 spielt bei der Biosynthese der Neurotransmitter GABA, Dopamin und Serotonin als Coenzym eine wichtige Rolle und ist somit für die gesunde perinatale Entwicklung des Zentralnervensystems von Bedeutung. In Studien mit Ratten konnte gezeigt werden, daß neugeborene Tiere von Müttern mit einem Vitamin-B6-Mangel biochemische und morphologische Anomalien im Gehirn (reduzierte GABA- und Dopaminkonzentrationen, verminderte Dendritenverzweigungen und reduzierte Zahl der myelinisierten Axone und Synapsen) aufwiesen, was Verhaltens- und motorische Störungen, wie epilepsieartige Krampfanfälle und Bewegungsstörungen zur Folge hatte. Bei menschlichen Neugeborenen mit einem schweren Vitamin-B6-Mangel wurden ähnliche Störungen beobachtet. Neugeborene, die marginal mit Vitamin B6 unterversorgt waren, wiesen ein niedrigeres Geburtsgewicht auf und zeigten ein unreiferes reaktives und adaptives Verhalten als richtig ernährte Säuglinge. Es ist zwar noch nicht möglich, die für eine optimale Gehirnentwicklung benötigte Menge an Vitamin B6 genau zu definieren; man sollte aber schwangeren und stillenden Frauen empfehlen, Vitamin-B6-reiche Nahrung auszuwählen.
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  • 25
    ISSN: 1436-6215
    Keywords: Pollenallergene ; Lebensmittelallergence ; exotische Früchte ; Kreuzreaktivität ; IgE-Immunoblotting ; Food allergens ; pollen allergens ; cross-reactivity ; exotic fruit ; IgE-immunoblotting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Viele Studien belegen, daß das Phänomen der birkenpollenassoziierten Nahrungsmittelallergie auf spezifische IgE-Antikörper zurückzuführen ist, die primär gegen Birkenpollenallergene gerichtet sind und mit verwandten Proteinen in Obst, Nüssen und Gemüse kreuzreagieren. Wir haben ein neues Muster der Kreuzreaktivität identifiziert, das auf einem 35 kDa - Protein aus Birkenpollen beruht. Es handelt sich um ein Minorallergen der Birke, gegen das ca. 10–15 % der Birkenpollenallergiker spezifische IgE-Antikörper aufweisen. Inhibitionsstudien mit dem Enzymallergosorbens-Test (EAST) und mittels Immunoblot zeigen die Kreuzreaktivität dieses Proteins zu Proteinen vergleichbarer Größe aus Litschi, Mango, Banane, Orange, Apfel, Birne und Karotte. Das 35 kDa-Protein ist immunologisch unabhängig von Bet v 1, dem Hauptallergen der Birke. Dagegen haben wir auch ein Protein mit einer Größe von 34 kDa beobachtet, bei dem es sich vermutlich um ein Bet v 1-Dimer handelt.
    Notes: Summary Food allergies in birch pollen allergic patients have been shown to be due to cross-reactivities of specific IgE antibodies which are directed against birch pollen allergens with related proteins in fruit, nuts and vegetables. We identified a new cross-reactive structure of 35 kDa in birch pollen and some plant food extracts by Enzyme Allergosorbent Test (EAST) and immunoblot inhibition studies. The 35 kDa birch pollen protein is a minor allergen to which approximately 10–15 % of birch pollen allergic individuals have specific IgE. Our data demonstrate that there is cross-reactivity of this protein with proteins of comparable size from lychee, mango, banana, orange, apple, pear and carrot. While the 35 kDa protein is immunologically independent of the major birch pollen allergen Bet v 1, we also observed IgE binding to a 34 kDa structure which appears to be a Bet v 1 dimer.
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  • 26
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    European journal of nutrition 35 (1996), S. 378-386 
    ISSN: 1436-6215
    Keywords: Erfrischungsgetränke ; Energy Drinks ; Coffein ; Taurin ; Caffeine ; energy drinks ; refreshing drinks ; taurine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary It was the aim of the present study to evaluate how adolscents in Germany accept and consume the new caffeineated drinks (NCD), which can now be legally marketed in Germany. In summer and fall 1994, three surveys were carried out at different schools in Germany (Aachen, Cologne, Wuppertal, Berlin-West and Berlin-Ost). 1 265 boys and girls were asked foracquaintance with NCD (module I) and 875 of them aboutconsumption (module II). With 727 pupils a third question (module III) was applied by which consumption of Cola drinks compared to that of NCD could be quantified. In total, 93.6 % of the young people indicated toknow about the NCD, and 53.3 % to havetasted these new drinks. Consumption was reported assometimes (〈1 can/week) from 23 % and asrepeatedly (1–7 cans/week) from 3 %.Acquaintance andconsumption were clearly related to age and gender, but even the youngest group (10–13 years old) indicated to havetasted the NCD (30.7 % in females and 50 % in males) and to drink themsometimes (5.2 % in females and 23.1 % in males). In the series with question module III 9.5 % reportednot to drink cola, 36.6 % to drink cola“sometimes“, 30.9 %“repeatedly”, 8.6 %“often” and 11.6 %“frequently” (〉2 cans/day). The corresponding figures for the NCD were 69.9 % (non-drinkers), 23.3 %“sometimes”, 3.3 %“trepeatedly”, 0.3 %“often” and 0.6 %“frequently”. The results suggest that all young people in Germany know about the NCD but actually consume these new drinks moderately. They prefer cola drinks. The observation, however, that a small group may consume extreme amounts and that even very young pupils consume the NCD regularly should give rise to have a close look at the consumption pattern in the near future.
    Notes: Zusammenfassung Im Hinblick darauf, ob Jugendliche zu übermäßigem Konsum bei den neuartigen Erfrischungsgetränken neigen, sollte geprüft werden, wie diese seit einiger Zeit in Deutschland verfügbaren, neuartigen Coffein-Drinks (NCD) von Jugendlichen angenommen und konsumiert werden. Im Sommer und Herbst 1994 wurden drei Umfragen in verschiedenen Schulen in Deutschland (Aachen, Köln, Wuppertal, Berlin-West und Berlin-Ost) durchgeführt. Gefragt wurde bei 1 265 Schülerinnen und Schülern nach demBekanntheitsgrad der NCD (Befragungsmodul I) und bei 875 von ihnen nach demKonsum (Befragungsmodul II). Bei 727 Schülerinnen und Schülern wurde darüber hinaus eine Vergleichsbefragung (Konsum an NCD im Vergleich zu herkömmlichen Cola-Getränken) vorgenommen (Befragungsmodul III). Bei den verschiedenen Fragen gaben insgesamt 93,6 % der Jugendlichen an, die NCD zukennen, 53,3 % sie schon einmalprobiert zu haben; 23 % der Jugendlichen tranken diese Getränkegelegentlich (〈als 1 Dose/Woche), 3 %häufiger (1–7 Dosen/Woche). Es zeigte sich eine klare Abhängigkeit des Konsumverhaltens vom Geschlecht und Alter. Dabei ist bemerkenswert, daß auch in der jüngsten getesteten Gruppe (10–13 Jahre alt) 30,7 % der Mädchen bzw. 50 % der Jungen die NCD schonprobiert haben und sic zu 5,2 bzw. 23,1 %gelegentlich konsumieren. In der Vergleichsbefragung mit dem Modul III gaben 9,5 % der befragten Jugendlichen an, Cola-Getränkenicht zu trinken, 36,6 % „gelegentlich“, 30,9 % „häufiger“, 8,6 % „oft“ und 11,6 % „sehr oft“ bzw. ‚sehr viel“ (letztere Kategorie entspricht mehr als 2 Dosen pro Tag). Für die NCD lagen die entsprechenden Häufigkeiten bei 69,9 % (Nicht-Trinker), 23,3 % ‚gelegentlich“, 3,3 % ‚häufiger“, 0,3 % ‚oft“ und 0,6 % ‚sehr oft“ bzw. ‚sehr viel“. Aus den Ergebnissen läßt sich schließen, daß fast alle Jugendlichen in Deutschland die NCD kennen und überwiegend maßvoll mit diesen neuartigen Getränken umgehen. Sie bevorzugen Cola-Getränke. Da offensichtlich einige wenige Jugendliche zu extremem Konsum neigen bzw. schon in relativ jungem Alter zu den NCD greifen, sollte die Entwicklung der Verzehrsgewohnheiten weiterhin aufmerksam verfolgt werden.
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  • 27
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    European journal of nutrition 35 (1996), S. 2-5 
    ISSN: 1436-6215
    Keywords: Iodmangel ; Iodidurie ; Iodversorgung Strumaprophylaxe ; Iodine deficiency ; urinary iodide excretion ; goiter prevention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Germany finds itself among the most iodine deficient countries of Europe. Voluntary use of iodized salt constitutes the only goiter prophylaxis. In the last few years, measures such as the opening up of European internal markets, abolition of lac pertaining to the alimentary iodine consumption. Random samples of urine collected from 5 932 persons without thyroid ailment, distributed over 32 regions of Germany, were measured for iodine excretion. The median value of iodine excretion was 72.4 µg I/g creatinine. Children under 10 years (76.9) and persons over 70 years (80.7) showed a slightly higher iodine elimination than those between 11–70 years (71.9). No differences between the former East Germany and West Germany as well as North, South and middle regions of unified Germany were observed. 55 % of the study population presented with iodine values between 50 and 100 µg, 19 % with lower than 50 µg. Only 9 % showed sufficient iodine state. The results expose the inadequacy of the voluntary measures to tackle the problem of alimentary iodine deficiency.
    Notes: Zusammenfassung Deutschland zählt zu den iodärmsten Ländern Europas. Die Strumaprophylaxe durch Verwendung iodierten Speisesalzes beruht auf dem Prinzip der Freiwilligkeit. Durch forcierte Aufklärung, Öffnung des europäischen Binnenmarktes und Wegfall der Deklarierungspflicht für mit Iodsalz hergestellte Nahrungsmittel könnte sich die alimentäre Iodversorgung in den letzten zwei Jahren verbessert haben. Wir untersuchten in 32 Regionen Deutschlands bei 5 932 seitens der Schilddrüse weder diagnostizierten noch behandelten Personen die Iodidausscheidung im Spontanurin. Der Median betrug 72,4 µg Iodid/g Kreatinin. Regionale Unterschiede gab es nicht. 9 % hatten eine ausreichende Iodversorgung (über 150 µg/d), 17 % lagen zwischen 100–150 µg, 55 % zwischen 50–100, 17 % zwischen 25–50, 2 % unter 25 µ. Die Ergebnisse belegen, daß der alimentäre Iodmangel auf der Basis der Freiwilligkeit nicht zu beheben ist.
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  • 28
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    European journal of nutrition 35 (1996), S. 51-52 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 29
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    European journal of nutrition 35 (1996), S. 53-54 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
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  • 30
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    European journal of nutrition 35 (1996), S. 143-149 
    ISSN: 1436-6215
    Keywords: Nahrungspräferenzen ; Verzehrsgewohnheiten ; Lieblingsspeisen ; Ernährungserziehung ; sozial-kulturell ; Food preferences ; eating habits ; favorite foods ; nutritional education ; sociocultural data
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary This study was conducted by the Technical University of Munich-Weihenstephan on behalf of the Department of Education of the city of Munich. A total of 82 children as well as their parents and 23 kindergarten teachers in five Munich kindergartens were questioned about their food preferences, and their sociocultural data were gathered. The results showed that the nationality and the religion of the mother were fundamental to the origin and consolidation of the eating habits of the children. Other important und influencing factors were: the peer group and the teachers in the kindergarten, the father's job, the sex and the age of the children. When comparing the food preferences of the children and their role models, it was found that the preferences and aversions were more similar to those of their own mothers/teachers/members of the peer group than to those of children of other peer groups, other parents or other teachers.
    Notes: Zusammenfassung Im Auftrag des Schulreferats der Stadt München wurden an der Technischen Universität München-Weihenstephan insgesamt 83 Kinder sowie deren Eltern und 23 Erzieherinnen in 5 Münchner Kindergärten zu ihren Nahrungspräferenzen befragt und ihre sozial-kulturellen Einflüsse untersucht. Die Ergebnisse zeigten, daß die Staatsangehörigkeit und Religion der Mutter wesentlich zur Entstehung und Festigung der Verzehrsgewohnheiten von Kindern beitragen. Als weitere wichtige Einflußfaktoren erwiesen sich die Kindergartengruppe, der Beruf des Vaters, das Geschlecht und das Alter der Kinder. Beim Vergleich der Nahrungspräferenzen von Kindern und ihren Bezugspersonen zeigte sich, daß die Vorlieben und Abneigungen von Kindern und ihren eigenen Müttern/Erzieherinnen/Gruppenkameraden ähnlicher waren als die von Kindern und Müttern/Erzieherinnen/Gruppenkameraden anderer Kindergartenkinder. Daraus wird der Schluß gezogen, daß die eigene Mutter und Bezugspersonen einen hohen Einfluß bei der Ausprägung von Nahrungspräferenzen haben.
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  • 31
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    European journal of nutrition 35 (1996), S. 163-171 
    ISSN: 1436-6215
    Keywords: Tagesverpflegung ; Altenheime ; Energie ; Nährstoffe ; Daily diet ; nursing homes for the elderly ; energy ; nutrients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Daily diet from 20 nursing homes for the elderly in the German state of Hessen was collected over a period of 7 days. Caloric free beverages were not included. After weighing and protocoling, the components of the meals were combined to one sample per day. Energy, protein, fat, carbohydrate and dietary fiber content was determined by analytical methods and by calculation using the nutrient table Federal Foodstuffs Key (Bundeslebensmittelschlüssel). Mean calculated contents exceeded analytical determined data except for dietary fibre. In comparison to the recommendations of the German Association for Nutrition (Deutsche Gesellschaft für Ernährung) concerning nutrient intake of the elderly, energy, fat and protein content of the daily diet were too high. Carbohydrate content did not reach the recommendations, being at least 50 % of energy intake. It is remarkable that dietary fibre content exceeded the recommendations of 30 grams per day. In Hessen a similar study was already done in 1982. Regarding energy, protein, fat and carbohydrate content, only negligible changes could be stated since that time.
    Notes: Zusammenfassung Die Verpflegung von zwanzig hessischen Altenheimen wurde an sieben aufeinanderfolgenden Tagen gesammelt. Kalorienfreie Getränke wurden nicht miterfaßt. Die Komponenten der einzelnen Mahlzeiten wurden gewogen und protokolliert und zu je sieben Tagesproben zusammengefaßt. Der Energie-, Protein-, Fett-, Kohlenhydrat- und Ballaststoffgehalt der Tagesproben wurde zum einen analytisch bestimmt, zum anderen mit Hilfe der Nährwerttabellen des Bundeslebensmittelschlüssels rechnerisch ermittelt. Außer bei den Ballaststoffen lagen im Durchschnitt die berechneten über den analysierten Gehalten. Verglichen mit den Empfehlungen der Deutschen Gesellschaft für Ernährung für die Nährstoffzufuhr von Senioren waren der Energie-, Fett- und Proteingehalt der angebotenen Kost zu hoch. Die Empfehlung, 50 % der Energiezufuhr durch Kohlenhydrate abzudecken, wurde nicht erreicht. Bemerkenswert war, daß der Ballaststoffgehalt den empfohlenen Wert von 30 g pro Tag überschritt. Eine ähnliche Studie wurde in Hessen bereits 1982 durchgeführt. In bezug auf den Energie-, Protein-, Fett- und Kohlenhydratgehalt hat sich seit der ersten Untersuchung wenig verändert.
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  • 32
    ISSN: 1436-6215
    Keywords: Ernährungsepidemiologie ; food frequency questionnaire (FFQ) ; quantitative, individuelle Ernährungserhebung ; Methodenvergleich ; Nutritional epidemiology ; food frequency questionnaire (FFQ) ; quantitative, individual nutritional questionnaire ; comparison of methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary With this paper we attempt to present a possible way of making quantitative estimates of the quantities of selected, preventively important food stuff groups consumed using a food frequency questionnaire together with a 3-day dietary protocol. The 3-day dietary protocol used in the 1984/85 MONICA survey of the former GDR is used as the standard. For large nutritional/epidemiological studies (e.g., cancer or cardiovascular cohort studies) this combination of methods is suggested as a means of arriving at quantitative estimates for nutritional habits in relation to the product groups presented here. Further investigations regarding correction factors are necessary where the food frequency is either very low or very high to detect potential inaccuracy.
    Notes: Zusammenfassung In vorliegender Arbeit wird der Versuch einer Möglichkeit zur quantitativen Einschätzung von Verzehrsmengen ausgewählter, präventiv bedeutungsvoller Nahrungsmittelgruppen auf der Grundlage einer Methodenkombination von Häufigkeits- und 3-Tage-Ernährungsprotokollen dargestellt. Grundlage ist ein 3-Tage-Protokoll der MONICA-Stichprobe 1984/85 der damaligen DDR. Für die dargestellten Produktgruppen wird diese Mcthodenkombination für große ernährungsepidemiologische Studien (z.B. Krebsoder Herz-Kreislauf-Kohorten-Studien) zur quantitativen Einschätzung von Ernährungsgewohnheiten vorgeschlagen. Weitergehende Untersuchungen zu Korrekturfaktoren für möglicherweise auftretende Verzerrungen bei sehr geringer oder hoher Verzehrshäufigkeit sind notwendig.
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  • 33
    ISSN: 1436-6215
    Keywords: Butterfett ; Rapsöl ; trans-Fettsäuren ; Laurin-, Myristin- und Palmitinsäure ; Stearin- und Ölsäure ; Butterfat ; rapeseed oil ; trans fatty acids ; lauric, myristic and palmitic acid ; stearic and oleic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary Butter is rich in lauric, myristic, and palmitic acids which are assumed to be hypercholesterolemic. The replacement of usual dietary fat by rapeseed oil induces a serum cholesterol decrease. The objective of the study consisted in measuring the influence of feeding different amounts of full-fat rapeseed or oil-rich rapeseed cake to dairy cows to improve the fatty acid composition of milk fat. The results demonstrate a significant increase of iodine number and spreadability of butter. The percentage of lauric+myristic+palmitic acid (LMP) decreased by about 18 % of whole fatty acids. Stearic and oleic acid increased significantly but the percentage oftrans octadecenoic acid increased too. It can be concluded that the special butter has a nutritionally improved fat characterized by an increase of cholesterol-lowering fatty acids (C18 and C18:1) and a decline of cholesterol-elevating fatty acids (LMP).
    Notes: Zusammenfassung Butter weist einen hohen Anteil an Laurin-, Myristin-und Palmitinsäure auf, die als hypercholesterämisch gelten. Ein Austausch des üblichen Nahrungsfettes durch Rapsöl bewirkt beim Menschen einen Abfall des Serumcholesterols. Durch Verfütterung verschiedener Mengen von Vollfettraps und ölreichem Rapskuchen an Milchkühe sollte geprüft werden, inwieweit das Fettsäurenspektrum der Milch qualitativ zu verbessern ist. Die Ergebnisse zeigen einen signifikanten Anstieg der Jodzahl und damit der Streichfähigkeit des Butterfettes. Die Anteile an Laurin-, Myristin-und Palmitinsäure (LMP) verminderten sich um etwa 18 % der Gesamtfettsäuren. Signifikante Anstiege ergaben sich besonders für die Stearin- und Ölsäure, aber auch für dietrans-Vaccensäure. Es kann gefolgert werden, daß durch den erhöhten Anteil an cholesterolsenkenden Fettsäuren (C18 und C18:1) sowie die Abnahme der cholesterolsteigernden Fettsäuren (LMP) eine Butter mit verbesserten ernährungsphysiologischen Eigenschaften zur Verfügung steht.
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  • 34
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    European journal of nutrition 35 (1996), S. 178-184 
    ISSN: 1436-6215
    Keywords: Fish oil ; micro-encapsulation ; lipids ; rats ; fatty acids ; oxidative status ; vitamin E ; Fischöl ; Mikroverkapselung ; Lipide ; Ratten ; Fettsäuren ; oxidativer Zustand ; Vitamin E
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Der ernährungsphysiologische Wert eines mikroverkapselten Fischölprodukts wurde untersucht. Drei Gruppen mit je zehn männlichen Wistar-Ratten erhielten isokalorisches Futter mit 20 Gew. % Fettanteil. In den beiden Testgruppen wurde 5 Gew. % Fischöl entweder in der freien oder in der mikroverkapselten Form der Nahrung beigemischt. Der restliche Fettanteil bestand aus Schmalz und Maisöl mit einem Anteil von 10 Gew. % Linolsäure. Die Kontrollgruppe erhielt nur Schmalz und Maisöl. Die fettfreie Matrix des mikroverkapselten Produkts wurde dem Futter der Kontrollgruppe beigemischt, so daß sie in jedem Futter vorhanden war. Die Aufnahme von marinen, (n-3) mehrfach ungesättigten Fettsäuren (PUFA) aus den beiden unterschiedlichen Fischöldiäten spiegelt sich im Fettsäureprofil der Phosphatidylcholine (PC), Phosphatidylethanolamine (PE), Triglyceride (TG) und Cardiolipin (CL) der Leber wider. In diesen Gruppen wurde auch eine Hemmung der Elongation von Linolsäure beobachtet, was zu höheren Werten dieser Fettsäure in Leber-PC und -PE führte. Die Konzentrationen an Gesamtlipiden, Triglyceriden, Cholesterin und Phospholipiden in der Leber waren in allen Gruppen gleich. Zusätze von langkettigen (n-3) PUFA beeinflußten die Konzentration der Plasma-TG nicht, erniedrigten jedoch den Plasma-Cholesterinspiegel. Die Bestimmung der Glutathion-peroxidase-Aktivität und Cytochrom-P450-Konzentration in der Leber zeigte keine Veränderung des oxidativen Zustands nach Fütterung von freiem bzw. mikroverkapseltem Fischöl. Die Aufnahme von (n-3) PUFA verringerte die Vitamin-E-Konzentration im Plasma, während der Gehalt an Vitamin E in der Leber unverändert blieb. Zusammengefaßt kann gesagt werden, daß die Fütterung von Fischöl und mikroverkapseltem Fischöl zum gleichen Fettsäuremuster in verschiedenen Lipidklassen (TG, PC, PE, CL) und zu vergleichbaren Konzentrationen von Leber-und Plasmalipiden führt. Außerdem führen Zusätze von Fischöl oder mikroverkapseltem Fischöl zu keinem oxidativen Stress, wenn dem Futter Antioxidantien in ausreichender Menge zugesetzt wurden. Daraus kann man schließen, daß Zusätze von mikroverkapseltem Fischöl zu Lebensmitteln geeignet sind, die tägliche Aufnahme von (n-3) PUFA zu erhöhen.
    Notes: Summary The nutritional value of a micro-encapsulated fish oil product has been investigated. Three groups of 10 male Wistar rats each were fed diets containing 20% (w/w) of fat, and only the type and form of the fat added was different. In the test groups 5% (w/w) of fish oil either as such or in a micro-encapsulated form was incorporated in the diets. The remaining fat was lard supplemented with corn oil to a dietary content of linoleic acid at 10% (w/w). The control group received lard and corn oil only. A mixture similar to the dry matter in the micro-encapsulated product was also added to the diets not containing this product. The uptake of marine (n-3) polyunsaturated fatty acids (PUFA) from both types of fish oil supplement was reflected in the fatty acid profiles of liver phosphatidyl cholines (PC), phosphatidyl ethanolamines (PE), triglycerides (TG) and cardiolipin (CL). A suppression of the elongation of linoleic acid leading to a higher concentration of this fatty acid in liver PC and PE was also observed. The concentration of total lipids, triglycerides, cholesterol and phospholipids in liver was similar in all groups. Supplements of long chain (n-3) PUFA did not influence the concentration of plasma TG but lowered the level of plasma cholesterol. No change in the oxidative status, measured as glutathione peroxidase activity and cytochrome P450 concentration in the liver, was found after feeding with fish oil either directly or in the micro-encapsulated form. Intake of (n-3) PUFA lowered the concentration of vitamin E in plasma while the content of vitamin E in the liver was unchanged. Overall, fish oil and micro-encapsulated fish oil resulted in the same fatty acid pattern in the major lipid classes and the same concentrations of liver and plasma lipids. Furthermore, supplementation of fish oil or micro-encapsulated fish oil did not induce oxidative stress when the diets were supplemented with ambient concentrations of antioxidants. It is concluded that micro-encapsulated fish oil is suitable for increasing the intake of (n-3) PUFA by fortification of normal daily food ingredients.
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  • 35
    ISSN: 1572-8366
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Stronger collaboration between government organizations (GOs), NGOs, and rural people has long been advocated as a means of enhancing the responsiveness, efficiency, and accountability of GOs and NGOs. This paper reviews the arguments and evidence for specific types of collaboration for sustainable agricultural development, setting it into the context of Korten's (1980) concept of “learning process.” Taking recent examples from Udaipur District in India, it reviews the experiences and potential of collaboration, arguing that, while informal interaction increases and enriches the fabric of pluralist development, certain strategic decisions often require a degree of formality. These include decisions on the development of human resources — here both the users and providers of services. Moreover, human resource development (HRD) must be viewed in the context of the mandates, aspirations, and systems of accountability and rewards of the institutions concerned. These determine whether institutions develop and expand their own human resources or draw upon those of others by collaborating with them. Individuals engaged in these organizations can be more effectively induced to collaborate with others by combinations of flexibility and appropriate reward systems than they can be forced to do so by instructions or commands. Several conclusions follow: decisions to act together are unlikely to progress unless translated into concrete actions; authority to take local-level decisions in GOs needs strengthening if they are to provide the necessary flexibility; and, although collaboration should in principle be built on the comparative advantage of different types of organization, in practice, each will have to incorporate the skills of the other, at least to some level, if they are to communicate effectively. NGOs and GOs must also enhance their understanding of farmers' ability to make demands on external organizations. Edging towards collaboration is a delicate and painstaking process. Only if many of the above conditions are given due priority will early examples have something to offer to the numerous NGOs, GOs and international agencies wishing to learn from them.
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  • 36
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    Agriculture and human values 13 (1996), S. 42-51 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Given the limitations of the “project” mode of development assistance, and the likelihood that funding will not be as available in the future for financing large development projects as it has in the past, it is appropriate to consider alternative mechanisms for American institutions and professionals to remain engaged in development efforts overseas. One hopes these will be more effective and cost-effective than previous channels of development aid. The “collaboration” is suggested here as such a mechanism. It involves a US university with overseas universities, government agencies, and nongovernmental organizations (NGOs) in interdisciplinary problem solving, with sustainable agricultural and rural development as the goal, requiring relatively modest levels of funding. There are also benefits to the US institution as it becomes more current and knowledgeable about development problems and opportunities, and better able to provide relevant teaching and research. New partnerships supported by private funding can usefully complement larger-scale official efforts and can fill in gaps where flexible operations relying on the quality of ideas and strong personal relationships offer high returns.
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    Agriculture and human values 13 (1996), S. 20-31 
    ISSN: 1572-8366
    Keywords: Landcare ; sustainable agriculture ; Australia ; community participation
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The landcare program has been embraced by governments, farmer organizations and conservation groups throughout Australia as offering a model for effective community action to assist the move to more sustainable resource use. Over 2,500 landcare-type groups now operate across Australia with 65,000 members including almost 30% of the farming community. This research used surveys of landcare group activity in most Australian states, a study of the regional landcare action plan (RLAP) process in the state of Victoria, and a survey of landholders in north east Victoria to assess landcare program effectiveness, and particularly, the assumptions underlying the program logic. Information provided revealed the vast scale of community participation in landcare and the considerable amount of onground work undertaken by groups and landholders. Analysis of north east landholder surveys indicated landcare participation had a significant impact upon landholder awareness of issues, level of knowledge, and adoption of best bet practices. However, research findings also highlighted a number of concerns about the program logic and implementation, and the authors suggest it is time to adopt a revised landcare program model.
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    Agriculture and human values 13 (1996), S. 78-85 
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    Agriculture and human values 13 (1996), S. 87-88 
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    Agriculture and human values 13 (1996), S. 10-20 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This article examines the efforts by the Northwest Treeplanters and Farmworkers United union to organize Mexican migrant farmworkers in the Willamette Valley. It focuses on the union's 1995 organizing campaign of strawberry pickerśs, the largest campaign in the history of Pacific Northwest agriculture. To provide context for the union's efforts, the article develops the historical role and changing nature of Oregon agriculture, sketches the politics of agriculture in the state, and describes the industry's labor system. The article concludes that significant gains for strawberry pickers were made during the 1995 campaign; the long-term consolidation of those gains remains to be demonstrated.
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  • 41
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    Agriculture and human values 13 (1996), S. 39-47 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This study of arable agriculture in East Anglia, UK, draws on the experiences of farmer participatory research and the use of indigenous knowledge in agricultural development in less developed countries. Farmers were found to be continually doing research, although agricultural science has tended to play it down. Farmers' research was found to be closely linked to the specific locality and the strategies, aspirations, and experiences of farmers. The diversity of agriculture within East Anglia makes local research necessary and the idea of blueprints for agricultural production untenable. The process of generating information can come from learning while working, which may appear to be experiential rather than experimental. Other ideas are generated by observing chance occurrences and some farmers were found to be doing more structured experiments similar to agricultural science. Criticisms of farmers' own research are reviewed. However, this paper proposes that such research should not be compared to scientific method, since agricultural science has the primary objective of generating information while farmers' research is embedded in the local context and is part of the farming practice. It is therefore necessary to have complementary roles for farmers' own research and formal research rather than an attempt to combine or translate indigenous knowledge and farmers' experimentation in agricultural science.
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  • 42
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    Agriculture and human values 13 (1996), S. 71-74 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A development project introduces various changes into a community. Some of these changes are positive while others are negative or warrant better planning. Evaluation reports designed strictly for quantitative, targetoriented physical and fiscal achievements often overlook many of these changes. Our personal field observations and experiences with an agricultural development project showed us several examples of impacts brought about in the local farming system in some hill districts of Nepal. These impacts cannot be neglected and project evaluation and progress reports should accommodate such changes
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    Agriculture and human values 13 (1996), S. 52-58 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Agricultural development is an activity with many ethical problems. Nowhere are these problems more evident than in tropical forest regions, like the Amazon. This paper examines ethical issues associated with a particularly controversial activity in the region: pastures research. The paper discusses three general critiques of Amazonian agricultural development: ecological, social equity and cultural survival. A particular pastures research project is then examined. The paper concludes that pastures research can be an ethically sound activity when carried out in a manner that is sensitive to the social, cultural, and ecological context. The paper concludes that ethical decisions regarding agricultural research are context sensitive. A better appreciation of potential ethical dilemmas can be obtained by seeking participation by a variety of social actors in designing and carrying out agricultural research.
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  • 44
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    Agriculture and human values 13 (1996), S. 86-86 
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    Agriculture and human values 13 (1996), S. 59-68 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The high levels of land use, inputs, and investment, along with the specific forms of organization and management that characterized Cuba's state extensive growth model during the 1980s, could not overcome the challenges posed by the integrated care required by the sugarcane crop and corresponding industrial activities. Starting in 1993, large state farms have been converted into Basic Units of Cooperative Production with some degree of autonomy. Although first-year production results are not satisfactory, it is too early to evaluate their performance. Their establishment, however, is a step in the right direction to alleviate the problems that the previous forms of organization and management inherent to the state extensive growth model were unable to solve.
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    Agriculture and human values 13 (1996), S. 23-23 
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  • 47
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    Agriculture and human values 13 (1996), S. 62-74 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 48
    ISSN: 1572-8366
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The tradition of planting and maintaining home gardens is an expression of culture and represents an intense interaction between humans and plants. Forty-nine home gardens in northeastern Thailand were surveyed and found to be quite rich and diverse. The gardens contained domesticated plants, species that are not native to the area, and local non-domesticates. We focused on women's gardening practices as behaviors that create an intensive interaction with the physical and social environment and found that women are increasing their management and manipulation of non-domesticated resources. Home gardens, maintained primarily by women, are part of a continuum of resource areas that are constructed and utilized. The maintenance of specific plants in the gardens provide a source of stability in the rapidly changing cultural, social, and economic environment.
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    Agriculture and human values 13 (1996), S. 43-47 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Community shared agriculture is a concept that brings food producers and consumers together in a relationship that supports values associated with sustainable agriculture, community development, and food security. At the heart of the concept is the notion of sharing. Participants share the real costs of food production through fair prices for the farmer and by assuming part of the risk of poor harvests. They also share the rewards that come through a seasons supply of fresh produce, the development of fellowship, and the knowledge that they are part of an effort to “think globally, act locally.”
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    Agriculture and human values 13 (1996), S. 79-79 
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    Agriculture and human values 13 (1996), S. 64-73 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The study's purpose was to estimate the variety of foods consumed within standard and ethnic food categories by three groups of women between 18 and 35 years of age. Foreign-born Chinese women [N = 21], Chinese-American women [N = 20] and white American women [N = 23] kept 4-day food records, after instruction. Analysis of variance showed that the mean number of different foods consumed by the foreign-born Chinese was significantly [p 〈 0.05] lower than those eaten by the other two groups for breads/cereals, dairy products, ethnic foods, fats, meats, sweets/sugars, and vegetable categories. White American women consumed significantly more dairy products and legumes/nuts than either of the groups of Chinese women. Diets of the Chinese-American women were more nutrient dense than those of the women in the other groups, containing significantly more energy, riboflavin, iron, folacin, and calcium than those of the foreign-born Chinese women. The percentage of kilocalories derived from fat [33–34%] did not differ among groups. 95% of foreign-born and 85% of Chinese-American women affirmed their ethnic identification by consuming foods belonging to Chinese cuisine; whereas, the percentage [30%] of white American women selecting Chinese food was significantly lower. Mexican and Italian foods were selected by significantly more white and Chinese-American women than by foreign-born Chinese women. Approximately 20% of both groups of Chinese women, but 49% of white American subjects, ate Japanese food. Chinese-American women retained a preference for Chinese food, similar to that of the foreign-born Chinese women. However, the Chinese-American women consumed cheeses, legumes, raw vegetables in salads, and foods from Italian and Mexican cuisines, indicating their acceptance of foods commonly consumed by white American women. Dietary acculturation among the Chinese-American women improved their diets over those of the foreign-born Chinese women and these results support the theory that consumption of a greater variety of foods increases nutrient density of diets.
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    Agriculture and human values 13 (1996), S. 21-38 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract To explain how agricultural landscapes become social constructions of the natural environment, this essay utilizes Jurgen Habermas's concept of rationality and Pierre Bourdieu's constructs of field and habitus to examine how social relationships shape the way three farmers perceive, alter, and evaluate their land. Intensive interviewing and aerial photographs are used to document the processes through which farmers internalize the primary rationalities of social relationships as a foundation of decision-making regarding water impoundments on their land. One farmer internalizes an instrumental rationality while interacting within relationships with the economic and political system; his landscape changes are meant to improve his ability to extract profit from the land. A second case focuses on a farmer who draws upon familial relationships to provide a substantive counter to the instrumental rationalities of economic relationships; he built a pond to conserve soil. The final case is of a farmer who resists social relationships governed by an instrumental rationality; he built a pond to improve and preserve the beauty of his farm.
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    Agriculture and human values 13 (1996), S. 2-9 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The weaver ant, Oecophylla smaragdina Fabricius (Hymenoptera: Formicidae), has long been known as perhaps the first example of human manipulation of a natural predator population to enhance the natural biological control of insect pests. The practice of ant husbandry in Vietnamese citrus orchards and the knowledge associated with the use of weaver ants in the Mekong delta are described. In contrast to other regions of Asia, where weaver ants are noted for their role in the protection of citrus from insect damage, citrus farmers in the Mekong delta explain the benefits of ant husbandry in terms of an improvement in fruit quality, likened to the influence of fertilizers, that occurs in direct response to excretory products deposited by the weaver ants as they patrol the fruit. A series of tests, carried out in 1993–94, rated the external shine, sweetness, juiciness, and overall appeal, as characteristics of fruit quality, for paired comparisons of sweet orange, mandarin, and pummelo fruit that had been grown in the presence of weaver ants or from which ants had been excluded. The tests indicate a strong influence of the presence of the weaver ant on external shine, juiciness, and overall appeal for each of the citrus fruits, but particularly for mandarin. The significance of these results and ant husbandry practices in the Mekong delta are discussed in relation to the development of citrus production in Vietnam.
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    Agriculture and human values 13 (1996), S. 75-75 
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    Agriculture and human values 13 (1996), S. 64-70 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Central African highland farmers' perceptions of common bean disease were investigated using both phytopathology and anthropological techniques. Farmers rarely mentioned diseases as production constraints in formal questionnaires. More participatory research showed farmers often related disease symptoms to the effects of rain and soil depletion for fungal diseases, or to varietal traits for bean common mosaic virus. Rain or moisture is divided into numerous forms through which it can damage plants, both physically and through putrefaction. Most conditions associated with putrefaction appear to be linked to pathogens. Farmers have an understanding of plant health closely related to their concept of human health. In plants, this understanding is based on the prior state of plant health. Conceptually, local disease management strategies are based on prevention by managing the conditions that promote good plant health rather than by treating disease symptoms. Intervention strategies that build on local knowledge are encouraged.
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    Agriculture and human values 13 (1996), S. 1-1 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract One of the most striking features observed throughout tropical agricultural frontiers is the extreme variability in land-use strategies from one farmer to the next. This article analyzes the forest conversion process and predominant land uses associated with smallholder settlement expansion in the Amazon frontier. The discussion seeks to increase understanding of the micro and macro-level forces that propel land-use decisions in the Amazon and offer insights about how farmers' land-use decisions may be altered to bring about forms of resource use that are consistent with the constraints and opportunities of the frontier environment. Recognizing that no frontier area can be truly representative of the Amazon as a whole, this article also introduces some detailed evidence from another Amazon country (Ecuador) within a topic that has been previously dominated by research mainly in Brazil. The analysis suggests that to be effective, any policy or technology-based effort on the part of governments or researchers to alter colonist land-use systems must begin to look systematically at the production systems of agricultural colonist populations already present in frontier environments. This knowledge is essential to understand the social and economic factors affecting present land use and choice of technology. It is also important for understanding factors influencing farmers' demand for more optimal systems of land use that are consistent with varying agroecological potentials, demographic situations, and the management capacity of the farmer.
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    Agriculture and human values 13 (1996), S. 69-77 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract AllSweden Shall Live! is an umbrella movement of 2,300 rural development organizations that has taken shape in reaction to political and economic threats to “the living countryside.” The movement's strategy combines self-help activities and political mobilization. Ritual events celebrating a shared culture, a culture that blends traditional and newly invented elements, are crucial means of maintaining solidarity and mobilizing energies. The article investigates a self-help activity, saving country stores, and a political event, a “Countryside Parliament,” both motivated by a commitment to sustain rural communities in a critical time.
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    Agriculture and human values 13 (1996), S. 76-78 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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    Agriculture and human values 13 (1996), S. 13-23 
    ISSN: 1572-8366
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This paper explores the concept of accountability in development efforts focusing specifically on member accountability. Accountability to members has been defined as the degree to which intended beneficiaries can hold decision-makers responsible for the outcomes of their decisions. A framework for assessing member accountability in grassroots organizations has been discussed. Data for this study were collected in four women's organizations working with income generating activities in India. A brief overview of the structures of each of the organizations is presented to enable a comparison of those structures. The findings of the study reveal that development organizations that are more member-accountable are likely to deliver greater economic and social benefits to their members.
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  • 61
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    Agriculture and human values 13 (1996), S. 33-41 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Increasing pragmatic and ethical concerns have been raised about the inadequacies of conventional approaches to agricultural research and extension worldwide and the lack of integrated efforts among researchers, extension educators, and users. This paper examines three models of these relationships: the diffusion or supply model; the induced innovation or demand model; and the synthesis triangular or supply/demand model. The triangular model builds and improves upon the previous models by focusing on the role of clients or users in the broadest sense in creating a demand for science and extension education, as well as on the role of scientists and extension educators in creating a supply. The triangular model views the relationship as an interactive partnership in which research and extension education are conducted in response to client needs and demands expressed through negotiation, persuasion, and coercion involving all partners. To implement this model will require significant organizational and managerial changes as well as reorientation in the values and attitudes of researchers, extension educators, clients, and their organizations. The remainder of the paper presents a brief discussion of suggested strategies at the individual, institutional, regional, national, and international levels for enhancing this partnership in order to more effectively meet the future needs of our food system.
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  • 62
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    Agriculture and human values 13 (1996), S. 76-77 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 63
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    Agriculture and human values 13 (1996), S. 78-79 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 64
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    Agriculture and human values 13 (1996), S. 23-32 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Community food security and environmental justice are parallel social movements interested in equity and justice and system-wide factors. They share a concern for issues of daily life and the need to establish community empowerment strategies. Both movements have also begun to reshape the discourse of sustainable agriculture, environmentalism and social welfare advocacy. However, community food security and environmental justice remain separate movements, indicating an incomplete process in reshaping agendas and discourse. Joining these movements through a common language of empowerment and systems analysis would strongly enhance the development of a more powerful, integrated approach. That opportunity can be located in the efforts to incorporate community food security and environmental justice approaches in current Farm Bill legislation; in particular, provisions addressing community food production, direct marketing, community development, and community food planning.
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  • 65
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    Agriculture and human values 13 (1996), S. 48-63 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Black farmers are still Black farmers, yet now are considered a part of minority or small or limited resource farmers/ranchers (SLRF/R) by the Department of Agriculture. Except for a few Southern states, their numbers have fallen from a remnant to a fragment in recent years. They continue to leave agriculture at a faster rate than whites. What few programs the Department has for this category of producers (SLRF/R) show genuine promise, provided they are pursued diligently by the Congress and the Department. Also vigorous enforcement of civil rights laws and directives of the Secretary and the new initiatives by the Office of Civil Rights Enforcement (OCRE) have to be sustained.
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  • 66
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    Agriculture and human values 13 (1996), S. 80-80 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 67
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    Agriculture and human values 13 (1996), S. 2-19 
    ISSN: 1572-8366
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A system of environmental ethics recently developed by Lawrence Johnson may be used to analyze the moral implications of biological control. According to this system, entities are morally relevant when they possess well-being interests (i.e., functions or processes that can be better or worse in so far as the entity is concerned). In this formulation of ethical analysis, species and ecosystems are morally relevant because they are not simply aggregates of individuals, so their processes, properties, and well-being interests are not reducible to the sum of their individual members. Following Johnson's thesis, species and ecosystems have morally relevant interests in surviving and maintaining themselves as integrated wholes with particular self-identities. This theoretical structure gives rise to a number of ethical criteria that are particularly relevant to biological control, which apply to the ecosystem (the extent to which it is large, native, unique, and integrated) and to the action being considered (the extent to which it is novel, omnipresent, monitored, reversible, and necessary). In these terms, it is evident that not all biological control efforts are ethically defensible. In general terms, natural biological control is most desirable, followed by augmentative strategies, classical approaches, and finally neoclassical biological control. Two specific cases (neoclassical biological control of rangeland grasshoppers and classical biological control of prickly pear cactus) illustrate the ethical concerns. Finally, it can be shown that formalized restrictions of biological control are necessary, given the unique properties of this technology
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    Agriculture and human values 13 (1996), S. 1-2 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 69
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    Agriculture and human values 13 (1996), S. 24-32 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract It is widely accepted that the success of rural nongovernmental organizations depends heavily on leadership and the organizational abilities of individual leaders. Drawing on the recent history of the cotton farmers' movement in Mali, this article identifies critical issues related to the development and sustainability of rural leadership. Special attention is given to how both heroic and post-heroic approaches to leadership might be joined in order to help nongovernmental organizations contribute to both political democratization and economic development.
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    Agriculture and human values 13 (1996), S. 52-61 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Numerous evaluations of the Bean/Cowpea Collaborative Research Support Program (CRSP) have documented CRSP contributions to food production and availability with impacts valued in the millions of dollars in developing countries as well as in the US. These reports emphasized collaboration as a critical factor in the success that emanated from CRSP research and training. Real collaboration among males and females across disciplinary, national, ethnic, cultural, and language differences is not easy. This review of CRSP experiences in building productive collaborations gives actual case studies, including some failures, and discusses lessons learned in the process. The importance of wide participation, shared resources, and facilitated interpersonal relations to back up the dedication and commitment of the participants in emphasized. The program represents an investment of the US Agency for International Development with contributions in excess of 25 percent from participating US and Host Country institutions.
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    Agriculture and human values 13 (1996), S. 75-75 
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    Agriculture and human values 13 (1996), S. 1-2 
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    Agriculture and human values 13 (1996), S. 12-22 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Indigenous agricultural practices in semiarid West Africa must be seen as dynamic operations that serve different ends. These ends are not only agricultural, but symbolic. By highlighting how farmers in the Central Plateau region of Burkina Faso organize their farming strategies, the “agriculture as performance” arguments developed by Richards (1987, 1993) can be both challenged and extended from the humid forest zone of West Africa. Farmers, it can be argued, are also keen “planners;” in order to meet their goals they invest considerable effort in overcoming ecological constraints, and also spend time forging links with various institutions working for agricultural development. Technologies and ideas from multiple sources—including those from some innovative development institutions — are incorporated in agricultural planning and practices in different ways, by different farmers, and for different reasons. The prospect of locally initiated and managed agricultural change emerging on the Central Plateau will be dependent upon this dialogue between farmer innovation, local organizations, and development projects. Agricultural systems are, in many cases, consciously “constructed” through sustained investment in the land and in natural resource management. Dryland management efforts need to recognize the strategic and planned nature of these activities, if they are to work with farmers who are actively building and improving their own livelihood systems.
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    Agriculture and human values 13 (1996), S. 33-42 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Bioregionalists have championed the utility of the concept of the watershed as an organizing framework for thought and action directed to understanding and implementing appropriate and respectful human interaction with particular pieces of land. In a creative analogue to the watershed, permaculturist Arthur Getz has recently introduced the term “foodshed” to facilitate critical thought about where our food is coming from and how it is getting to us. We find the “foodshed” to be a particularly rich and evocative metaphor; but it is much more than metaphor. Like its analogue the watershed, the foodshed can serve us as a conceptual and methodological unit of analysis that provides a frame for action as well as thought. Food comes to most of us now through a global food system that is destructive of both natural and social communities. In this article we explore a variety of routes for the conceptual and practical elaboration of the foodshed. While corporations that are the principal beneficiaries of a global food system now dominate the production, processing, distribution, and consumption of food, alternatives are emerging that together could form the basis for foodshed development. Just as many farmers are recognizing the social and environmental advantages to sustainable agriculture, so are many consumers coming to appreciate the benefits of fresh and sustainably produced food. Such producers and consumers are being linked through such innovative arrangements as community supported agriculture and farmers markets. Alternative producers, alternative consumers, and alternative small entrepreneurs are rediscovering community and finding common ground in municipal and community food councils. Recognition of one's residence within a foodshed can confer a sense of connection and responsibility to a particular locality. The foodshed can provide a place for us to ground ourselves in the biological and social realities of living on the land and from the land in a place that we can call home, a place to which we are or can become native.
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    Agriculture and human values 13 (1996), S. 1-1 
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    Agriculture and human values 13 (1996), S. 74-78 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Traditional African American foods, also referred to as “soul food,” are often given a blanket label of “poor food choices.” The cultural value of these ethnic foods may be disregarded without sufficient study of their nutrient content. This study showed that of the various foods perceived as traditionally African American by the local sampled population, greens were the most often identified as such by 78% and the most frequently consumed (22%) by the subjects. 37% perceived chitterlings as a traditional food, yet only 30% consumed them, and only on an occasional basis. Okra, yams, and black-eyed peas had relatively high consumptions but were not often perceived as traditional African American foods. The latter may suggests a lack of historical food facts, relating to indigenous African foods or may indicate the mainstreaming of these foods. Cowpeas or black-eyed peas, okra, sesame seeds, and watermelon seeds were originally brought to North America from Africa. The literature contains scant information on this particular topic, which leaves unanswered: (1) the current consumption of traditional foods by African Americans, (2) certain availability of these foods; and (3) the positive contributions to the diet that these foods may contribute. The author recognizes that “African American” is the most appropriate and preferred term used widely today, to refer to African descendants in North America, however “Black” and “Black American” will be used interchangeably, to reflect consistency of literature cited herein. First, this article will define traditional African American foods and relate their historical significance. Secondly, it will present data on current food consumption from a sample population of African Americans surveyed in San Diego. Lastly, this article will explore possible applications of the research itself.
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    Agriculture and human values 13 (1996), S. 48-63 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Debates about the relationship between agricultural technology and the conservation of crop genetic diversity are often hampered by unclear vocabulary and imprecise data. Various interpretations of the terms “modern variety,” “local variety,” “hybrid,” and “green revolution” are first explored, and then evidence is examined regarding the effect of modern varieties on intra- and intercrop diversity, risk, input use, and farmer decision-making. The objective is to urge a more reasoned debate about the future of plant genetic resources.
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  • 78
    ISSN: 1572-882X
    Keywords: metal chelates ; hydroxyethyl cellulose complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Reactions of hydroxyethyl cellulose (HEC) with Cr III, NiII, CoII, or CuII chlorides in aqueous medium yielded complexes with formulae [M(HEC)Cl m .n H 2O], wherem =1 or 2 and n=2 or 3. HEC acted as a uninegatively charged bidentate ligand in the case of CrIII and NiII, and as a neutral ligand in the case of CoII and CuII complexes. The spectra showed that the binding sites in CrIII and NiII complexes were the ether oxygen between two ethoxyl groups and the oxygen of the hydroxyl group; while in the CoII and CuII complexes the binding sites were the oxygen of ethoxyl groups and the primary alcoholic O atom of glucopyranose rings. These complexes would most likely exhibit octahedral geometry with CrIII, NiII, and CoII, but square planar configuration in the case of the CuII complex. The ligand parameters of the CrIII, NiII, and CoII metal chelates were calculated in different solvents and at different temperatures. The thermal stability of the above complexes was investigated and the overall thermodynamics functions ΔG0, ΔH0, and ΔS0, associated with complex formation, were estimated.
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  • 79
    ISSN: 1572-882X
    Keywords: regio-selectively substituted cellulose hetero-esters ; X-ray fibre diagram ; electron diffraction diagrams ; conformational analysis, packing analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The molecular and crystal structure of cellulose propanoate diacetate (CPDA, 2,3-di-O-acetyl-6-O-propanoyl cellulose) has been determined through combined X-ray fibre diagrams and electron diffraction patterns of single crystal analysis, aided by stereochemical restraints by using a constrained linked-atom least-squares refinement. The unit cell of CPDA is orthorhombic with space group P2 12121 and parameters:a =1.239 nm,b =2.498 nm and c (fibre axis)=1.044 nm. Based on these data, coupled with the observed density of the crystals, there are four chains per unit cell, distributed in two antiparallel pairs of parallel chains, and the independent repeat is the disaccharide unit in each chain. A preliminary CPDA disaccharide unit was derived based on the centre residue of cellotriose undeca-acetate, and this model was refined through a conformational analysis. The best model obtained by combining the stereochemical refinement with the diffraction intensities gave R=0.272 (R″=0.259) for the three-dimensional information from the X-ray fibre diagram and R=0.248 (R″=0.246) for the base plane data resulting from electron diffraction analysis.
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  • 80
    ISSN: 1572-882X
    Keywords: cellulases ; dissolving pulp ; Trichoderma reesei ; cellulose hydrolysis ; alkaline solubility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Hardwood dissolving pulp was treated with purified Trichoderma reesei endoglucanases and cellobiohydrolases. Endoglucanases were more efficient in hydrolysing pulp carbohydrates than were the cellobiohydrolases at the same protein dosage. Endoglucanases also lowered the viscosity and improved the alkaline solubility more dramatically. There was a clear correlation between the alkaline solubility and viscosity, and therefore the solubility could only be improved by lowering the viscosity of the pulp. At the same degree of cellulose degradation, endoglucanase II was found to be most effective in reducing the viscosity and thus improving the solubility. Cellobiohydrolases had a less pronounced effect on the viscosity or solubility.
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    Cellulose 3 (1996), S. 189-202 
    ISSN: 1572-882X
    Keywords: water-fibre interactions ; hornification ; drying ; water retention value ; differential scanning calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The state of water in wet pulps was studied over a wide moisture range, reflecting the conditions on the paper machine from the press section to the reel. Two methods were used: water retention value (WRV) and differential scanning calorimetry (DSC). To increase the measuring accuracy, a modification to the WRV procedure was introduced. The results were directly compared by plotting the values over the observed moisture range. Different types of water were defined from DSC data: free water, freezing bound and non-freezing bound water. The water types were plotted in water distribution charts against the solids content. These charts were compared with the WRV data. For all pulps, the three water fractions were found to be interdependent while the free water removal rate decreased. Water removal did not take place as an independent water fraction removal sequence. The presence of fines and pulp recycling were found to influence the amount of freezing bound water, but not non-freezing bound water. The results showed an irreversible decrease in WRV (hornification) for all investigated pulps in the range of 20–75% solids content. This pattern corresponded to the relative amount of free water present. Freezing bound water disappeared at a solids content of over 80–85%. With the absence of free water, no further hornification occurred. It was concluded that the WRV appears to be reduced by a closure of large voids by adhesion of the cellulosic pore walls. The softening effect of water is required to cause ‘wet hornification’ of the structure.
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    Cellulose 3 (1996), S. 21-44 
    ISSN: 1572-882X
    Keywords: paper tear strength ; chemical pulps ; organosolv pulps ; surface analysis ; cellulose structure ; cation content ; fiber surface properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Research has intensified in recent years on organic solvent pulping processes to supplement or replace conventional pulping processes. One of the main problems with organosolv pulps is the inferior tear strength compared to kraft pulps. An investigation of the properties of two acidic (acetic acid organosolv and acid sulfite) and one basic white spruce pulp (kraft) was carried out to determine factors affecting differences in tear strength. Properties evaluated were lignin and sugar content, mineral composition, ESCA oxygen-to-carbon ratios, acid-base characteristics, water wettabilities, degree of polymerization and crystallinity of cellulose, fiber length and coarseness, and physical properties of the various pulps. Differences in tear strength have been attributed to degradation and changes in the cellulose structure, the hemicellulose-lignin matrix in which the degree of polymerization of hemicelluloses plays the most important role in low yield pulps, and finally, the bonding capacity of the fiber surfaces.
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  • 83
    ISSN: 1572-882X
    Keywords: regio-selectively substituted cellulose hetero-esters ; X-ray fibre diagram ; electron diffraction diagrams ; conformational analysis ; packing analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The molecular and crystal structure of cellulose acetate dipropanoate (CADP, 6-O-acetyl-2,3-di O-propanoyl cellulose) has been determined by using a constrained linked-atom least-squares refinement method, combined with X-ray and electron diffractograms and stereochemical refinement. The diffraction analysis indicated that CADP crystallized in a P2 1 monoclinic space group with unit cell parameters:a =1.088 nm,b (unique axis)=1.593 nm,c (fibre axis)=1.509 nm and β =94.1°. The best model derived from combining the stereochemical refinement with the diffraction intensities gave R=0.217 (R″=0.195) for the three-dimensional information from the X-ray fibre diagram and R=0.198 for the base plane data resulting from electron diffraction analysis. In the model, the crystal structure of CADP consisted of a system of right-handed threefold helices packed in an antiparallel fashion, with two molecules passing through the unit cell.
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    Cellulose 3 (1996), S. 183-188 
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    Cellulose 3 (1996), S. 281-284 
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    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
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  • 86
    ISSN: 1572-882X
    Keywords: bacterial cellulose ; Acetobactor xylinum ; cellulose crystals ; CPMAS13C NMR ; FT-IR ; xyloglucan ; carboxymethyl cellulose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Effects of polymeric additives with different degrees of polymerization (DP) or substitution (DS) on the crystallization of celluloses Iα and Iβ have been examined at an early stage of the incubation of Acetobactor xylinum by using newly developed FT-IR spectroscopy. It was found that the mass fraction of cellulose Iα is greatly decreased with increasing concentrations of carboxymethyl cellulose sodium salt (CMC) or xyloglucan (XG) in the incubation medium. Such a decrease in the mass fraction of cellulose Iα, which corresponds to the enhanced crystallization of cellulose Iβ, is more prominent for CMC or XG with lower DPs, but the additives with too low DPs are not so effective probably due to higher solubility and the lower adhesion on the surface of microfibrils. Moreover, the mass fractions of celluloses Iα and Iβ are highly correlated with the crystallite size of microfibrils, indicating that Iα is crystallized in larger-size microfibrils while Iβ is produced in smaller-size microfibrils. On the basis of these experimental results, the mechanism of the crystallization of celluloses Iα and Iβ is discussed in the Acetobactor xylinum system.
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  • 87
    ISSN: 1572-882X
    Keywords: accelerated tests ; aging tests ; cellulose degradation ; durability ; kinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Accelerated aging tests are credible and useful to predict paper permanence only if such tests can be shown to correlate with natural aging. In the first part of this study, a kinetic model was developed based on the accelerated aging results. In this report, we have shown that this kinetic model can indeed predict the natural aging results of lignin-free sheets with a statistical confidence. This is the first quantitative comparison of accelerated aging with natural aging.
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  • 88
    ISSN: 1572-882X
    Keywords: solid-state NMR ; cellulose degradation ; magic-angle spinning ; power transformers ; insulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A series of laboratory-aged transformer insulating papers were investigated using solid-state NMR spectroscopy. Carbon-13 CPMAS, and proton MAS experiments were carried out along with static proton relaxation (T1, and T1ρ) and free induction decay (FID) measurements. Some proton CRAMPS and proton-carbon-13 correlation (WISE) experiments were also undertaken. A change in the proton T1 and FID with ageing was detected. No detectable change was found in the proton T1ρ. Some amorphous cellulose was detected in the carbon-13 spectrum. There was, however, no evidence for a substantial change in the nature of the cellulose with ageing. The carbon-13 spectra from some aged samples showed signals not present in the spectrum from an unaged sample. This was taken to be evidence of chemical degradation. Proton MAS and the WISE exeriment gave some information about the nature of the water in the sample.
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  • 89
    ISSN: 1572-882X
    Keywords: cellulose ; hydroxyethyl cellulose ; methylation analysis ; substituent distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Monomer compositional data of a series of hydroxyethyl celluloses (HECs) with molar substitutions (MS) ranging from 0.2 to 2.4 were used to analyse the substituents in the samples. The data reveal that the reactivity of the pendant hydroxyl groups in the substituents decreases in progressed states of derivatization, and that the reactivity of the 6-O-positions is only large compared to the 2-O-positions in non-derivatized glucosyl residues. These two processes are not taken into account in any of the statistical models for the description of the substituent distribution in HECs, which shows that the assumption that the relative reaction constants of the various hydroxyl groups in HECs remain constant throughout the whole reaction is false. The occurrence of maxima in the mole fractions of the monomers was examined as a function of the MS of the samples by principal component analysis of the monomer compositional data. The results show that in the beginning phase of the derivatization mainly monosubstituted monomers are formed and that chain propagation of these substituents takes place, whereas in the progressed states of conversion mainly di- and trisubstituted moieties are formed. The changes in the reactivity of the various hydroxyl groups during the conversion of cellulose to HECs can be described by a model wherein the interactions of both NaOH and the diluents with the cellulosics are taken into account.
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  • 90
    ISSN: 1572-882X
    Keywords: cellulose dissolution ; dissolution mechanism ; morphology ; electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The influence of different solvents on the morphology of cellulose during the dissolution process was studied. Spruce sulfite pulp, cotton linters and hydrolysed cotton linters were treated for a short time with lithium chloride: N,N-dimethylacetamide (LiCl:DMAc) and an alkaline solution of iron sodium tartrate (EWNN), respectively. The changes occurring at the fibre surfaces and within the cell walls were observed by scanning as well as by transmission electron microscopy. The cellulose fibres show significant differences in the dissolution behaviour when comparing the reaction of the two solvents. Using LiCl:DMAc, the cotton linters fibres become lamellar separated and within the spruce sulfite pulp fibres solvent channels appear in the first step with the fibrils becoming separated. In contrast, EWNN has a swelling effect on the surface of the cellulose fibres. Both solvent systems predominantly affect the ends of the fibres and places where the wall structure has been damaged.
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  • 91
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    Cellulose 3 (1996), S. 165-181 
    ISSN: 1572-882X
    Keywords: mercerization ; Direct Blue 1 ; dyeing ; surface area ; accessibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The accessibility of cotton cellulose was determined after it had been mercerized both in the slack and tension states. Mercerized samples were either dried or retained in the undried state before dyeing to determine their accessibilities by the adsorption of Direct Blue 1. Samples were characterized also by techniques such as moisture adsorption, water retention value (WRV) and X-ray analysis. It appeared that the crystallinity of cotton mercerized under tension was slightly increased during dyeing. Dye adsorption increased in the order nonmercerized 〈tension-mercerized 〈slack-mercerized. Products mercerized and not dried adsorbed more dye than counterparts given the same swelling treatment but dried after mercerization. The presence of dye in a sample mercerized and undried before dyeing did not affect its crystallinity. From both the dye adsorption and WRV data it was concluded that structural collapse of the fibre is greater for the slack-mercerized product than its tension-mercerized counterpart after it is dried. It was also concluded from dye adsorption and water adsorption data that about 34% of the internal surface of cotton and mercerized cotton, available for water adsorption, is inaccessible to Direct Blue 1.
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  • 92
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    Cellulose 3 (1996), S. 243-267 
    ISSN: 1572-882X
    Keywords: aging tests ; cellulose degradation ; durability ; kinetics ; paper properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The validity of accelerated aging tests to predict and rank papers on their permanence has been under question, preventing the development of performance-based standards for permanent paper. We conducted a general kinetic analysis to investigate the aging process of paper. A general kinetic model is proposed to describe the depolymerization of cellulose. Experimentally it was shown that in the case of aging, cellulose degradation follows classic first-order kinetics as a special case of our general kinetic model. The Arrhenius equation was critically re-examined for the case of a multiple reaction system. It was shown analytically that the Arrhenius equation is still applicable when certain conditions are met. This was convincingly supported by experimental results. We also analysed the dependence of the degradation rate on the moisture content and hydrogen ion concentration. By conducting systematic experiments on these two factors, a general and quantitative relationship was established to explain the contribution of each factor and their interactions. Finally, based on this kinetic analysis, the effects of storage conditions on the life expectancy of paper were estimated.
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  • 93
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    Cellulose 3 (1996), S. 125-125 
    ISSN: 1572-882X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
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  • 94
    ISSN: 1572-882X
    Keywords: cellulose I ; cellulose II ; disordered cellulose ; hydration ; principal component analysis ; ball milling ; NMR-spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract An investigation into the effects of mechanical treatment and hydration on the order of cellulose substrates (microcrystalline cellulose and Cladophora cellulose) was performed by the use of ball milling followed by cyclic wetting and drying. The results, monitored by13C-CP/MAS NMR-spectroscopy, were evaluated by calculation of the crystallinity indices and principal component analysis of the NMR data acquired. The results showed that a large part of the disorder induced by the mechanical treatment of cellulose by ball milling is reversible and reordering upon hydration leads to the cellulose I form initially present. The C4 signals corresponding to the reversibly disordered cellulose chains are observed in the ‘amorphous region’ between 79 and 86 ppm in the13C-CP/MAS NMR-spectra together with signals from cellulose chains on the surface of ordered regions. The peak cluster which contains the C2, C3 and C5 ring carbons can be divided into two specific spectral regions; one between 74 and 77 ppm largely originates from ring carbons within disordered cellulose structures, and one between 70 and 74 ppm contains larger contributions from ordered cellulose. The behaviour of the celluloses upon milling is in accordance with a concept of ordered cellulose fibrils containing ‘amorphous’ cellulose mainly as surface layers and induced reversible lattice distortions.
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  • 95
    ISSN: 1572-882X
    Keywords: cellulose ; diffuse reflectance FT-IR spectroscopy ; fluorescence spectroscopy ; ozonation ; photochromism ; UV-visible reflectance spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Samples of ozonated pure cotton cellulose have been subjected to three extended periods of irradiation with monochromatic light at 350 nm, with intervening dark periods. The changes during the treatments were monitored using fluorescence spectroscopy. Photochromic behaviour, comprising a fairly rapid emission intensity decrease during irradiation and a slower recovery of the emission intensity in the dark at ambient temperature, was observed. Starting from the completion of the first irradiation/dark treatment the intervening dark reaction almost completely restored the situation prevailing before irradiation. The photochromism observed for a reference sample of cellulose not pretreated with ozone and for microcrystalline cellulose was similar but differed both in amplitude and in fluorescence recovery during the dark periods. The ozonated sample was also irradiated with the entire spectrum of a medium pressure Hg lamp. This treatment caused a strong increase in the emission intensity and a red-shift of the emission maximum. The changes caused by ozonation and irradiation were also studied by diffuse reflectance FT-IR and UV-visible reflectance spectroscopy.
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  • 96
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    Cellulose 3 (1996), S. 217-228 
    ISSN: 1572-882X
    Keywords: microcrystalline cellulose ; nitric acid ; addition compound ; amorphization ; sorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract For preparation of various modified forms of microcrystalline cellulose, an optional combination is proposed of hydrolytic activity with other properties of nitric acid such as, adduct forming ability (manifested as Knecht compound formation), oxidizing, bleaching and nitrating. The manifestation of a chosen acid function is reached by variation of the reaction conditions: concentration, temperature, time, etc. The sole-reagent continuous procedure involving several operations made in a predetermined sequence allows the use of a more simple technological scheme and saves energy, time and materials. The features of transformation of fibrous and microcrystalline forms of native cellulose into cellulose-II through the Knecht compound are discussed. Purely acidic transformation schemes of native cellulose into microcrystalline cellulose hydrate and amorphous low-nitrate powder cellulose according to the above scheme are considered. Morphological features as well as distinguishing properties — enhanced hydrophilicity, sorption activity and degree of whiteness — of the prepared materials are pointed out. The possibility of obtaining uniformly oxidized forms of powder cellulose according to this scheme and the outlook for the use of nitrogen(IV) oxide as a multifunctional reagent are discussed.
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  • 97
    ISSN: 1572-882X
    Keywords: crack propagation ; simulation ; films ; compacts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A model originally developed to simulate crack propagation in viscoplastic materials, where the micromechanism consists of void growth, has been evaluated for both pigmented films and porous compacts of cellulose derivatives. The program allows both visualization of crack growth and the calculation of crack velocity. The program is easy to use, enabling many simulations to be performed with minimum effort. The agreement with experimental observation both qualitatively and quantitatively is very good.
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  • 98
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    Cellulose 3 (1996), S. 63-75 
    ISSN: 1572-882X
    Keywords: antibodies ; cellulose synthase ; Acetobacter xylinum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract An immunochemical method was used to analyse the 83 and 93 Kd polypeptides of cellulose synthase from Acetobacter xylinum.Polyclonal antibodies were raised against the LDS-PAGE-fractionated 83 and 93 Kd polypeptides isolated from A. xylinum.Using these antibodies, the 83 and 93 Kd polypeptides were localized in the different fractions during purification of cellulose synthase, and the ratio of these two polypeptides was determined to be 1∶1. A differential solubilization of the 83 and 93 Kd polypeptides from the cell strongly suggested that the mechanism by which these two polypeptides originate from a single acsAB gene product (Saxena et al.,1994) must be via a post-translational cleavage. The results of trypsin treatment of the membrane fraction used in the purification of cellulose synthase were analysed to determine the fate of these two polypeptides and their relationship to the enzyme activity.
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  • 99
    ISSN: 1432-0789
    Keywords: Composting ; Organic matter degradation ; Humification ; Nitrogen forms ; Sweet sorghum bagasse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two types of compost, consisting of sweet sorghum bagasse with either sewage sludge or a mixture of pig slurry and poultry manure, were studied in a pilot plant using the Rutgers system. The total degradation of the piles as determined by the weight loss of organic matter during the bio-oxidative and maturation phases accounted for 64% of the organic matter applied and followed a first-order kinetic function. Concentrations of total and organic N increased during the composting process as the degradation of organic C compounds reduced the compost weight. Losses of N through NH3 volatilization were low, particularly in the compost with sewage sludge due to pH values of 〈7.0 and the low temperatures reached in the compost during the first 2 weeks. The C:N ratio in the two composts decreased from 24.0 and 15.4 to values between 12 and 10. Increases in cation exchange capacity and in fulvic and humic acid-like C revealed that the organic matter had been humified during composting. The humification index, the C:N ratio, fulvic:humic acid-like C, and cation exchange capacity proved to be the most suitable parameters for assessing the maturity of these composts.
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  • 100
    ISSN: 1432-0789
    Keywords: Carbon ; Coffee pulp ; Eisenia fetida ; Nitrogen ; Nutrients ; Vermicomposting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In Colombia, more than 1 million tons of coffee pulp are produced every year. Its transformation into compost by means of turned piles has led to a final product with poor physical and chemical characteristics and vermicomposting has been suggested as an alternative method of transforming these wastes into a useful organic fertilizer. The ability of the earthworm Eisenia fetida to transform coffee pulp into a valuable compost was evaluated. The influence of bed depth and time on different C fractions, N content and availability of nutrients was studied. The results showed that the C and N contents were not affected by the depth of the bed, whereas time affected both. An increase in the fractionation ratio, determined by calculating the C in the fraction smaller than 100 μm as a percentage of C in the samples as a whole, and low values of humic-like substances were recorded during vermicomposting. After ingestion of the pulp by the earthworms, an increase in available P, Ca, and Mg but a decrease in K were detected.
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