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An inaugural essay, on the Lupulus communis, of Gærtner; or the common hop.Bryarly, Wakeman, Glasgow, James, Barton, Benjamin Smith, January 1805 (has links)
"An inaugural dissertation, for the degree of Doctor of Medicine, submitted to the examination of the Rev. John Andrews, D.D. provost, (pro tem.) the trustees, and medical professors of the University of Pennsylvania, on the 5th day of June, 1805"--P. (3). / Dedicated to Dr. James Glasgow, of Baltimore, and Benjamin S. Barton, M.D. Microform version available in the Readex Early American Imprints series.
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The feasibility of using diploid by tetraploid crosses to obtain triploid hops (Humulus lupulus L.)DeNoma, Jeanine Streeter 04 November 1994 (has links)
The hop (Humulus lupulus L.) is a dioecious, diploid (2n=2x=20) species. Triploid
hops (2n=3x=30) are easily obtained from tetraploid by diploid crosses and are preferred
because of their natural seedlessness and increased vigor. The female inflorescence is used
for flavoring beer. Because brewers require product consistency, the brewing characteristics
of a new aroma-type hop must closely match the variety it is intended to replace while
showing improved adaptation and agronomic traits. Since triploid offspring should more
closely resemble the tetraploid parent from which they receive two-thirds of their genetic
material, breeders have traditionally selected known varieties to be the tetraploid parent with
the expectation this will increase the likelihood of obtaining progeny with similar brewing
chemistry. Tetraploid female parents are obtained through colchicine treatment of desirable
diploid varieties.
Naturally occurring tetraploid seedlings, sometimes found among the offspring of
tetraploid by diploid crosses, if suitable for breeding, could eliminate the tedious colchicine
treatment process now used to obtain tetraploids. Two such tetraploid males were obtained
from an Oregon cross in 1983. Since these two tetraploid males had attractive quality traits
similar to other males in the USDA germplasm collection with a proven history of producing
aroma-type progeny, they were thought to be suitable for use in a polyploid breeding program
for aroma hops.
The objective of this study was to determine the feasibility of using males as tetraploid
parents in diploid by tetraploid crosses to obtain triploid aroma hops. Tettnanger, a prized
German aroma hop, was used as the diploid female parent for these crosses.
Meiotic cells of the two tetraploid males showed some abnormalities at anaphase I and
the quartet stage; however, fertility, as determined from seed production and germination,
was adequate for breeding. Of 185 seedlings obtained, 57 were triploid females. The diploid
by tetraploid seedling population had a higher percentage of males than previously reported
for tetraploid by diploid crosses. One tetraploid male produced no triploid female offspring.
Seed content of the female triploid seedlings when subjected to a heavy pollen load averaged
2.4% compared to 20.1% for diploid seedlings from Tettnanger crosses. Triploid progeny
produced higher average yield than the Tettnanger parent.
The two tetraploid males and Tettnanger were very similar in chemical quality traits
comparable in male and female hops. Comparison among triploid and diploid progeny from
diploid by tetraploid crosses and diploid open-pollinated Tettnanger seedlings demonstrated
that the male parent influenced the a ratio, cohumulone content, and humulene to
caryophyllene ratio of the offspring. Many of the female triploid offspring genotypes showed
chemical quality traits similar to those of Tettnanger. / Graduation date: 1995
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Modeling of deep bed hop dryingStone, Marvin L. January 1982 (has links)
Thesis (Ph. D.)--Washington State University, 1982. / Includes bibliographical references (p. 128-130).
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Analytical and sensory evaluation of hop varietiesSanchez, Nora B. 30 March 1990 (has links)
The German hop Hallertauer, hallertauer is highly
valued because of its "noble aroma", but it has a very low
yield when cultivated in the U.S. Two new crosses of
Hallertauer, U.S.D.A. 21455 and 21459, have high yields
and promising aroma characteristics.
In order to predict sensory properties of beers as a
function of the varieties of hop used in brewing, a more
complete sensory and chemical characterization of hop oils
is necessary.
The aims of this study were to compare the aroma
profiles of the new crosses against the German variety by
determining their most important odor active compounds,
and correlating the sensory attributes evaluated by a
descriptive sensory panel (DSP) with the odor intensities
detected during the gas chromatograph (GC) effluent detected during the gas chromatograph (GC) effluent
sniffing. Oxygenated fractions were spiked into spring
water and evaluated by the DSP. The same samples were
injected into the GC and the effluents were evaluated
quantitatively and qualitatively by four subjects using a
special data collection device. Samples were then analyzed
by mass spectrometry (MS). There were no significant
differences among the three varieties based upon the DSP
results and the "aromagrams" obtained during the sniffing
of the GC effluents. Important odor active peaks were
associated with humulene oxidation products. A number of
statistical correlations existed between the sensory
attributes and the odor active peaks. In summary, the new
varieties are potential contributors to "noble aroma".
Trials with beers brewed with these hops are underway in
order to establish their contribution to beer flavor. / Graduation date: 1990
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Powdery mildew (Podosphaera macularis Braun & Takamatsu) resistance in wild hop genetic resources /Smith, Jodi M. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2005. / Printout. Includes bibliographical references. Also available on the World Wide Web.
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Investigation of hop downy mildew through association mapping and observations of the oospore /Parker, Thomas B. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2008. / Printout. Includes bibliographical references. Also available on the World Wide Web.
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Xanthohumol, a flavonoid from hops (Humulus lupulus) : in vitro and in vivo metabolism, antioxidant properties of metabolites, and risk assessment in humansYilmazer, Meltem 05 January 2001 (has links)
Reported here is an investigation to determine the in vitro and in vivo metabolism
of xanthohumol (XN). XN is the major prenylated flavonoid of the female
inflorescences (cones) of the hop plant (Humulus lupulus). It is also a constituent of
beer, the major dietary source of prenylated flavonoids. Recent studies have
suggested that XN may have potential cancer chemopreventive activity but little is
known about its metabolism. We investigated the in vitro metabolism of XN by rat
and human liver microsomes, and cDNA-expressed cytochrome P450s, and the in
vivo metabolism of XN by rats. The metabolites and conjugates were identified by
using high-pressure liquid chromatography, liquid chromatography-mass
spectrometry, and nuclear magnetic resonance. The antioxidant properties of two
metabolites and two glucuronides were examined. The possible risk of XN
consumption from beer or dietary supplements is discussed. The involvement of
metabolites of XN in cancer chemoprevention remains to be established. / Graduation date: 2001
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Prenylated flavonoids from hops (Humulus lupulus) as monofunctional inducers of the carcinogen-detoxifying enzyme, NAD(P)H:quinone oxidoreductaseAponso, G. Lalith M. 26 April 1999 (has links)
Graduation date: 1999
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Hop bittering compounds and their impact on peak bitterness on lager beer /Fritsch, Annette N. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 69-72). Also available on the World Wide Web.
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Charakterisierung der Interaktionen von SNARE-Proteinen mit dem vakuolären HOPS Tethering- Komplex bei der Fusion von VakuolenKrämer, Lukas 02 September 2011 (has links)
Der Austausch von Proteinen und Lipiden zwischen den Organellen des Endomembransystems wird über einen gerichteten Transport von Vesikeln gewährleistet. Für die spezifische Fusion der Transportvesikel mit der Akzeptormembran sind Tethering-Faktoren, Rab-GTPasen und SNARE-Proteine verantwortlich.
Die Zusammenlagerung der membranassoziierten SNAREs zu einem Bündel aus vier α-Helices leitet die Verschmelzung der Membranen ein. Obwohl jedes Kompartiment des Endomembransystems eine spezifische SNARE-Ausstattung besitzt, benötigen SNAREs zusätzliche Faktoren, um selektiv zu assemblieren. Diese Aufgabe wird von Tethering-Faktoren, SM-Proteinen und Rab-GTPasen übernommen.
In Saccharomyces cerevisiae ist der hexamere HOPS als Tethering-Komplex zusammen mit den SNAREs Vam3, Vam7, Vti1, Nyv1 und Ykt6 an der Fusion mit der Vakuole beteiligt.
Der Fokus dieser Arbeit lag auf der Chakterisierung der Wechselwirkung zwischen HOPS und SNAREs und der Analyse der Bedeutung dieser Bindungen für die Fusion mit der Vakuole.
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