Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 1 (1979), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Water resistance of sun protection products has been found to be best determined by the following methods:(1) Tests for determining UVL filter adherence to merino wool; this gives a rough value for orientation. Values in excess of 6% are suggestive of satisfactory adherence. (2) Tests for determining water resistance of sunscreen products on pig skin constitute a further essential step. Values in excess of 50% provide a realistic basis for tests in humans.In addition to filter adherence the product base, i.e. primarily the emulsifiers, are of special significance. Adequate results can be obtained with both W/O and O/W systems.Tests on volunteers are best done at the time of determining the sun protection factor, i.e. when simulating the events during a 2–3 h sunbath. Simulation should involve a single application of the test product in a pre-defined quantity and all activities conmmonly done in sunlight, e.g. swimming, as well as intermittent exercises to induce sweating.Values are considered as excellent, if 1 MED is not exceeded after 3 h exposure. Sun protection products with this characteristic qualify as adequate ‘all-day’ sunscreen for individuals with average sensitivity. Methodes pour mesurer la résistance à l'eau des produits anti-solaires
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 38 (1973), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 103 (1972), S. 464-472 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das feste β-Carotin ist gegen γ-Strahlung ziemlich stabil. Bei Bestrahlung unter Sauerstoffbegasung treten deutliche β-Carotin-Verluste erst bei der hohen Dosis von 12 Mrad auf; bei Bestrahlung an der Luft werden ähnliche Radiolyseerscheinungen erst durch wesentlich höhere Strahlendosen ausgelöst. Spaltungsprodukte, die bei 12 Mrad und Sauerstoffbegasung auftraten und dünnschichtchromatographisch aufgetrennt werden konnten, waren Isozeaxanthin, β-Carotin-5,6-5′, 6′-diepoxid, β-Carotin-5,8-5′,8′-diepoxid, β-Apo-12′-carotinal, β-Apo-10′-carotinal, 3,3′,6′-Trihydroxy-α-carotin-5,8-epoxid und Vitamin-A-Alkohol. Es ist bemerkenswert, daß ein Teil der Radiolyseprodukte (z. B. Vitamin-A1-Alkohol, β-Apo-12′-carotinal und β-Apo-10′-carotinal) Vitamin-A-Wirksamkeit besitzt.
    Notes: Abstract Solid β-carotene is remarkably stable to γ-irradiation. In an oxygen atmosphere doses as high as 12 Mrad were required to bring about significant losses of β-carotene, whereas in air even larger doses had to be applied in order to effect a comparable degree of radiolysis. Cleavage products which arose in O2 at a dose of 12 Mrad and which could be separated from each other by thin-layer chromatography were isozeaxanthin, β-carotene-5,5-5′,6′-diepoxide, β-apo-12′-carotenal, β-apo-10′-carotenal, 3, 3′, 6′-trihydroxy-α-carotene-5,8-epoxide and vitamin A1. It is notable that some of the radiolysis products (e.g., vitamin A1, β-apo-12′-carotenal and β-apo-10′-carotenal) possess vitamin A activity.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 105 (1974), S. 71-73 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ubiquinon 45 was γ-irradiated in tributyrin solution with 0.1, 1, 10, and 50 Mrad, resp.; by a dosis of 1 Mrad we could observe a clear loss of this substance. Based on IR-examination the main radiolysis product may be a substance with an unchanged ring structure, but with a hydroxyl group in the side chain.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 103 (1972), S. 383-386 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über die Radiolyse der Phytinsäure in wäßr. Lösung berichtet. Bei Bestrahlung mit einer Dosis von 30 Mrad konnte das Auftreten vonmyo-Inosittetraphosphat,myo-Inositpentaphosphat undmyo-Inositisopentaphosphat als Spaltungsprodukte beobachtet werden.
    Notes: Abstract Cleavage products observed to arise as a result of irradiation at a dose of 30 Mrad weremyo-inositol tetraphosphate,myo-inositol pentaphosphate andmyo-inositol isopentaphosphate.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 259 (1977), S. 299-301 
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 34 (1978), S. 602-604 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Sterile cultures ofChlamydomonas reinhardi, WT+, were treated with Hg-203 at 25°C to identify probably formed volatile mercury compounds. Experiments were performed with living and dead cells under aerobic or anaerobic conditions, respectively, and the mercury concentration was measured in the system algae/nutrient medium. We found a timerelated decrease of mercury concentration in the cell suspension and the cell-free nutrient medium due to a reduction of Hg++ to Hg0, probably caused by extracellular enzymes; monomethyl or dimethyl mercury could not be detected.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nutrition 18 (1979), S. 139-144 
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary In connection with the discussion about the appliance of artificial sweeteners in the nutrition of mankind, which reappeared recently, this study should indicate a possible interaction between these sweeteners and essential ingredients of food. It was examined in these model experiments with pure substances, how far the artificial sweeteners sodium saccharin and sodium cyclamate exert an influence on essential amino acids and water-soluble vitamins, compared to saccharose. The experiments with mixtures of these categories of substances were carried out both in aqueous solution at room temperature (25 °C) and at 80 °C, and in solid state at 120 °C and 150 °C. The reaction time was at room temperature several days, at increased temperature an hour each. At these experiments a remarkable diminution of the quantity of tryptophan and phenylalanine could be noticed at the presence of both artificial sweeteners after storage of some weeks at room temperature, whereas with the addition of saccharose the quantity of the amino acids was hardly changed. There could not be found any considerable decrease of quantity with the remaining essential amino acids leucine, isoleucine, threonine, methionine, valine, and lysine as well as with all the examined water-soluble vitamins (vitamin C, B1, B2, B6, B12 and nicotinamide). Losses of vitamin B1 and particularly of vitamin C could be proved during the reaction of sodium saccharin on these vitamins for 60 minutes at a temperature of 120 °C respectively 150 °C. The loss of quantity was not so high at the same conditions, when sodium cyclamate was added. The quantity did not change at all with the vitamins B2, B6, B12 and nicotinamide at the addition of sweeteners. A notable reduction of substance could be realized from all the essential amino acids (isoleucine, leucine, threonine, methionine, phenylalanine, lysine, tryptophan and valine) only with phenylalanine, tryptophan and methionine, resulting from treatment at a temperature of 150 °C for one hour with the presence of sodium cyclamate. The addition of sodium saccharin brought about this reduction only with phenylalanine.
    Notes: Zusammenfassung Im Zusammenhang mit der in jüngster Zeit wieder aufgetretenen Diskussion über die Verwendung künstlicher Süßstoffe in der Ernährung des Menschen soll diese Studie eine mögliche Wechselwirkung dieser Süßungsmittel mit lebenswichtigen Nahrungsbestandteilen aufzeigen. Es wurde im Modellfall mit Reinsubstanzen untersucht, inwieweit die künstlichen Süßstoffe Natriumsaccharin und Natriumcyclamat im Vergleich zu Saccharose einen Einfluß auf essentielle Aminosäuren und wasserlösliche Vitamine ausüben. Die Versuche mit Mischungen dieser Substanzklassen wurden sowohl in wäßriger Lösung bei Raumtemperatur (25 °C) und bei 80 °C als auch in fester Form bei 120 °C und 150 °C durchgeführt. Die Einwirkungszeit betrug bei Raumtemperatur mehrere Tage, bei erhöhter Temperatur jeweils eine Stunde. Dabei konnte eine bemerkenswerte Abnahme der Tryptophan- und Phenylalaninmenge bei Anwesenheit beider künstlichen Süßstoffe nach mehrwöchiger Lagerung bei Raumtemperatur festgestellt werden, wohingegen bei Saccharosezusatz die Aminosäuremenge kaum verändert wurde. Bei den übrigen essentiellen Aminosäuren Leucin, Isoleucin, Threonin, Methionin, Valin und Lysin sowie bei allen untersuchten, wasserlöslichen Vitaminen (Vitamin C, B1, B2, B6, B12 und Nicotinsäureamid) konnten hierbei keine nennenswerten Mengenverluste beobachtet werden. Bei einstündiger Einwirkung von Natriumsaccharin bei einer Temperatur von 120 °C bzw. 150 °C ließen sich Vitamin-B1- und besonders Vitamin-C-Verluste nachweisen. Natriumcyclamat-Zusatz bewirkte unter gleichen Bedingungen etwas geringere Mengenabnahme. Keine Mengenabnahmen waren bei den Vitaminen B2, B6, B12 und Nicotinsäureamid durch Zusatz von Süßstoffen festzustellen. Von den essentiellen Aminosäuren (Isoleucin, Leucin, Threonin, Methionin, Phenylalanin, Lysin, Tryptophan und Valin) war nur bei Phenylalanin, Tryptophan und Methionin infolge einstündiger Hitzebehandlung auf 150 °C bei Anwesenheit von Natriumcyclamat eine bemerkenswerte Substanzreduktion zu verzeichnen. Natriumsaccharinzusatz bewirkte diesen Effekt nur bei Phenylalanin.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An investigation was made of the possibility of quantitatively determining amino acids from a standard mixture by two-dimensional DC-separation, the relationship, demonstrated byPurdy andTruter, between the logarithm of the amount of substance in grams and the square root of the area of the fleck in mm2 being given due consideration. On the basis of the results obtained, an almost linear relationship was revealed between these two magnitudes for all 15 amino acids studied, but this holds only in a range of about 0.8–8μg of each individual amino acid.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Comparison trials were made of the activities ofα- andβ-amylase in non-irradiated and those rye seeds that have been exposed to 50 or 500 krad of radiation during various germination stages and in storage trials. It was found in the germination experiments that, in contrast to the non-irradiated controls, there was a marked decrease in theα-andβ-amylase activities. In the storage experiments, a comparison of the non-irradiated and the irradiated rye seeds at the same time intervals showed with regard to theirα-amylase activity an increase with a maximum value on the third storage day with subsequent decrease. The same holds likewise for the activity of theβ- amylase, only with the exception that immediately afterγ-irradadiation with 50 krad there appears a lessenedβ- amylase activity in comparison with non-irradiated controls. However, for the subsequent storage time, the same holds true as for theα-amylase.
    Notes: Zusammenfassung Vergleichende Untersuchungen über die Aktivitäten vonα- undβ-Amylase in unbestrahlten und mit 50 bzw. 500 kradγ-bestrahlten Roggenkörnern während verschiedener Keimstadien und im Lagerversuch wurden durchgeführt. Bei den Keimversuchen ergab sich gegenüber den unbestrahlten Kontrollen eine deutliche Abnahme der Aktivitäten vonα- undβ-Amylase. Bei den Lagerversuchen ergab ein Vergleich von unbestrahlten und bestrahlten Roggenkörnern in den gleichen Zeitintervallen hinsichtlich ihrerα-Amylaseaktivität deren Zunahme mit einem Maximalwert am 3. Lagertag und nachfolgender Abnahme. Ähnliches gilt auch für die Aktivität derβ-Amylase, nur mit der Ausnahme, daß unmittelbar nachγ-Bestrahlung mit 50 krad eine im Vergleich zur unbestrahlten Kontrolle verminderteβ-Amylaseaktivität auftritt. Für die nachfolgende Lagerzeit gilt dann aber Gleiches wie für dieα-Amylase.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...