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Characterization and applications of betalains from plants in the family amaranthaceaeCai, Yizhong, 蔡義忠 January 2002 (has links)
published_or_final_version / Botany / Doctoral / Doctor of Philosophy
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Maleimides (1H-pyrrole-2, 5-diones) from ancient sediments as indicators of photic zone anoxiaCrawford, Neil Adrian January 1999 (has links)
No description available.
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The molecular biology of avian visual pigments : evolution and spectral tuningHeath, Lesley Annette January 1998 (has links)
No description available.
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Studies of the energetics and mechanism of visual pigment rhodopsinsDixon, Sheila F. January 1986 (has links)
No description available.
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Isolation and Partial Characterization of Carotenoid Pigments of Mycobacterium RhodochrousJorgensen, Joyce A. 08 1900 (has links)
It was the purpose of this investigation to isolate and characterize the pigments of Mycobacterium rhodochrous by partition behavior, chromatographic data, and absorption spectra. In addition, it was the purpose to determine whether or not the type of pigments found in M. rhodochrous is typical of those found in other mycobacteria.
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A study of pigment production by PseudomonasPatty, Helen Lawson. January 1949 (has links)
LD2668 .T4 1949 P35 / Master of Science
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Studies on pigment fractions produced by Serratia marcescens BizioPoerio, Joseph. January 1959 (has links)
Call number: LD2668 .T4 1959 P65
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Melanogenesis and the structure of the melanin granuleStein, W D 30 June 2014 (has links)
Thesis (M.Sc.(Physiological Chemistry)--University of the Witwatersrand, Faculty of Science, 1954.
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Synthesis of hongconin and related naphtho[2,3-c]pyransOosthuizen, Francois Jacobus January 1995 (has links)
Thesis (MTech(Chemistry))--Cape Technikon, Cape Town,1995 / The naphtho[2,3-c]pyran occurs frequently in nature as derivatives of the 5,10 quinones.
The most common examples include the eleutherins and protoaphins.
These naturally occurring compounds have been found to possess antibiotic activity
through the process of bioactivation. The possibility of appropriately substituted
compounds functioning as bioreductive alkylating agents provides a logical model
that has a great deal of predictive power.
The thesis deals with the synthesis of some naphtho[2,3-c]pyrans to be tested
biologically; the challenge being to design compounds in a biologically inactive form
which become activated only subsequent to an in-vivo transformation.
Chapter One describes and compares a high yielding synthesis of a naphtho[2,3c]
pyran, hongconin, to a previous route.,a Racemic hongconin (29) has been
synthesised from adduct (43) formed by reaction between 1-methoxycyclohexa1,4-
diene (41) and 1,4-benzoquinone (42). The key steps
includes Fries and Claisen rearrangements, base and cerium(lVj initiated pyran ring
formation, C-4 pyran ring hydroxylation and silver(ll) mediated oxidation. The
target compound (29) was tested in vitro for antimicrobial activity and compared
to the results obtained for isoeleutherin (2) and its 9-demethoxy analoque (30).
The spectral data, melting points and yields of the individual compounds is as
described in Chapter Two.
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Analysis and processing issues of plastic color mismatchRabbani, Musharaf 01 May 2011 (has links)
Color is a visual characteristic which imparts the ability to categorize different
objects. When light strikes an object, there are three possibilities as to what can happen.
The light may be reflected, refracted or scattered. Human perception of color is due to a
combination of these. Plastics are polymeric materials. Polymers are generally colorless
and need colorants in order to have some color. One or more pigments in certain ratios
can be used to give a specific color to plastics. Slight variations in the proportions of
either of the used pigments, or their dispersion, may result in a color that is different from
the desired one. There can also be many other reasons for color mismatch such as
processing or degradation effects.
This study utilized the historical data records of SABIC IP to look at effects of
changing Grade on color (i.e. when the same color is produced from resin blends which
may have different amounts of resins, pigments or additives). These records were also
used to study effects of change in screw diameter and configuration on color (i.e. when
the same grade of a color is produced on two different production lines, different screw
diameters and configurations).
The effects of the processing parameters on the colors were also investigated by
carrying out experiments using a twin screw extruder at SABIC IP’s plant in Cobourg.
Resins, pigments and additives were dry blended and extruded while being subjected to
different processing conditions. Three processing parameters, namely temperature, rpm
and feed-rate, were chosen for the study. A three level factorial design of experiments
was used. An analysis of variance (ANOVA) has been utilized to find the effects of
individual parameters on color and the interaction between two parameters and their
cumulative effect on color. / UOIT
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