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2001

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Articles 1771 - 1800 of 2477

Full-Text Articles in Life Sciences

Wheat Polyphenol Oxidase: Distribution And Genetic Mapping In Three Inbred Line Populations, Tigst Demeke, Craig F. Morris, Kimberly A. Garland-Campbell, Garrison E. King, James A. Anderson, Hak-Gil Chang Jan 2001

Wheat Polyphenol Oxidase: Distribution And Genetic Mapping In Three Inbred Line Populations, Tigst Demeke, Craig F. Morris, Kimberly A. Garland-Campbell, Garrison E. King, James A. Anderson, Hak-Gil Chang

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The enzyme polyphenol oxidase (PPO) has been implicated in discoloration of Asian noodles. The recombinant inbred line (RIL) populations, M6/‘Opata 85’, NY18/CC, and ND2603/‘Butte 86’ were used to investigate the distribution, chromosome location, and number of loci involved in wheat (Triticum aestivum L.) PPO. PPO activity was measured by means of the substrates L-DOPA (L-3,4-dihydroxyphenyl-alanine) and L-tyrosine. The M6/Opata 85 RIL population had a normal distribution, while the ND2603/Butte 86 RIL population had a bimodal distribution for PPO activity (L-DOPA assay).

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Review Of Encyclopedia Of The Biosphere: Humans In The Worlds Ecosystems, John Stephen Brantley Jan 2001

Review Of Encyclopedia Of The Biosphere: Humans In The Worlds Ecosystems, John Stephen Brantley

Faculty & Staff Research & Creative Activity

No abstract provided.

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Review Of Food's Frontier: The Next Green Revolution, John Stephen Brantley Jan 2001

Review Of Food's Frontier: The Next Green Revolution, John Stephen Brantley

Faculty & Staff Research & Creative Activity

No abstract provided.

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Review Of Encyclopedia Of The Biosphere: Humans In The Worlds Ecosystems, John Brantley Jan 2001

Review Of Encyclopedia Of The Biosphere: Humans In The Worlds Ecosystems, John Brantley

Faculty & Staff Research & Creative Activity

No abstract provided.

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Review Of Food's Frontier: The Next Green Revolution, John Brantley Jan 2001

Review Of Food's Frontier: The Next Green Revolution, John Brantley

Faculty & Staff Research & Creative Activity

No abstract provided.

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The Role Of Matrix Metalloproteinase-2 In Glioma Invasion, Nicole Danielle Sauers Jan 2001

The Role Of Matrix Metalloproteinase-2 In Glioma Invasion, Nicole Danielle Sauers

Master's Theses

Overexpression of matrix metalloproteinase 2, MMP-2, is correlated with highgrade gliomas in vivo. The purpose of this study was to investigate whether MMP-2 overexpression in glioma cell lines leads to increased invasion of glioma cells in vitro. The entire MMP-2 gene was isolated from U87, a glioma cell line known to have high expression of wild-type MMP-2. This :tvIMP-2 gene was inserted in a sense and antisense orientation into pCR3 .1 vectors with a CMV promoter to ensure high levels of expression. Glioma cell lines were transfected with the sense and antisense constructs, as well as the pCR3.l vector alone …

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Cakß/Pyk2 Kinase Is A Signaling Link For Induction Of Long-Term Potentiation In Ca1 Hippocampus, Yueqiao Huang, Wei-Yang Lu, Declan W. Ali, Kenneth A. Pelkey, Graham M. Pitcher, You Ming Lu, Hiroshi Aoto, John C. Roder, Terukatsu Sasaki, Michael W. Salter Jan 2001

Cakß/Pyk2 Kinase Is A Signaling Link For Induction Of Long-Term Potentiation In Ca1 Hippocampus, Yueqiao Huang, Wei-Yang Lu, Declan W. Ali, Kenneth A. Pelkey, Graham M. Pitcher, You Ming Lu, Hiroshi Aoto, John C. Roder, Terukatsu Sasaki, Michael W. Salter

PCOM Scholarly Works

Long-term potentiation (LTP) is an activity-dependent enhancement of synaptic efficacy, considered a model of learning and memory. The biochemical cascade producing LTP requires activation of Src, which upregulates the function of NMDA receptors (NMDARs), but how Src becomes activated is unknown. Here, we show that the focal adhesion kinase CAKß/Pyk2 upregulated NMDAR function by activating Src in CA1 hippocampal neurons. Induction of LTP was prevented by blocking CAKß/Pyk2, and administering CAKß/Pyk2 intracellularly mimicked and occluded LTP. Tyrosine phosphorylation of CAKß/Pyk2 and its association with Src was increased by stimulation that produced LTP. Finally, CAKß/Pyk2-stimulated enhancement of synaptic AMPA responses was …

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Influence Of Western Corn Rootworm (Coleoptera: Chrysomelidae) Larval Injury On Yield Of Different Types Of Maize, Mario A. Urías-López, Lance J. Meinke Jan 2001

Influence Of Western Corn Rootworm (Coleoptera: Chrysomelidae) Larval Injury On Yield Of Different Types Of Maize, Mario A. Urías-López, Lance J. Meinke

Department of Entomology: Faculty Publications

Two field experiments were conducted in 1995-1996 to determine if there are common yield responses among maize hybrids to larval western corn rootworm, Diabrotica virgifera virgifera LeConte injury. Three yellow dent hybrids, five white food grade dent hybrids, and a popcorn hybrid were included in the study. The minimum level of rootworm injury as measured by root damage ratings (3.2-4.2) that significantly reduced yield was similar across the hybrids included in the study. However, the pattern of yield response to different rootworm injury levels varied among hybrids. This suggests that maize hybrids may inherently differ in their ability to tolerate …

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Dispersal Of Adult European Corn Borer (Lepidoptera: Crambidae) Within And Proximal To Irrigated And Non–Irrigated Corn, Thomas E. Hunt, Leon G. Higley, John F. Witkowski, Linda J. Young, Richard L. Hellmich Jan 2001

Dispersal Of Adult European Corn Borer (Lepidoptera: Crambidae) Within And Proximal To Irrigated And Non–Irrigated Corn, Thomas E. Hunt, Leon G. Higley, John F. Witkowski, Linda J. Young, Richard L. Hellmich

Department of Entomology: Faculty Publications

The European corn borer, Ostrinia nubilalis (Hübner), causes economic damage to corn, Zea mays L., throughout the Corn Belt. Because this insect has become the primary target of Bacillus thuringiensis Berliner (Bt) transgenic corn, current efforts addressing the management of O. nubilalis resistance to Bt corn require information on adult European corn borer dispersal and factors affecting its dispersal. In 1998 we conducted mark-release-recapture, release-recapture, and caged-mating studies to directly measure and compare local dispersal patterns of O. nubilalis adults within and proximal to irrigated and non-irrigated cornfields. Releases of marked adults were made corresponding to the first and second …

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Effects Of Decreasing Thermophotoperiod On The Eastern Subterranean Termite (Isoptera: Rhinotermitidae), Brian J. Cabrera, Shripat T. Kamble Jan 2001

Effects Of Decreasing Thermophotoperiod On The Eastern Subterranean Termite (Isoptera: Rhinotermitidae), Brian J. Cabrera, Shripat T. Kamble

Department of Entomology: Faculty Publications

Eastern subterranean termite, Reticulitermes flavipes (Kollar), workers were exposed to decreasing temperatures and a shift in photoperiod to simulate conditions that are encountered during the fall in eastern Nebraska. Mean water and fat content in termites exposed to a decreasing thermophotoperiod did not differ significantly from controls or laboratory colony termites. Survival was higher for termites subjected to a decreasing thermophotoperiod than for controls. This could be attributed to acclimation to low temperatures or a delayed mortality due to lowered metabolic activity at low temperature. Previously reported data on soil temperatures taken in Lincoln, NE, at a depth of 91.4 …

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Tyrosine And Phenylalanine Catabolism Bylactobacillus Cheese Flavor Adjuncts, S. Gummalla, Jeff Broadbent Jan 2001

Tyrosine And Phenylalanine Catabolism Bylactobacillus Cheese Flavor Adjuncts, S. Gummalla, Jeff Broadbent

Nutrition, Dietetics, and Food Sciences Faculty Publications

Bacterial metabolism of Tyr and Phe has been associated with the formation of aromatic compounds that impart barny-utensil and floral off-flavors in cheese. In an effort to identify possible mechanisms for the origin of these compounds in Cheddar cheese, we investigated Tyr and Phe catabolism by Lactobacillus casei and Lactobacillus helveticus cheese flavor adjuncts under simulated Cheddar cheese-ripening (pH 5.2, 4% NaCl, 15°C, no sugar) conditions. Enzyme assays of cell-free extracts indicated that L. casei strains catabolize Tyr and Phe by successive, constitutively expressed transamination and dehydrogenation reactions. Similar results were obtained with L. helveticus strains, except that the dehydrogenase …

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Making Sense Out Of Antisense: The Enablement Requirement In Biotechnology After Enzo Biochem V. Calgene, Matthew D. Kellam Jan 2001

Making Sense Out Of Antisense: The Enablement Requirement In Biotechnology After Enzo Biochem V. Calgene, Matthew D. Kellam

Indiana Law Journal

No abstract provided.

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"Notes On The Position Of The True Freshwater Crabs Within The Brachyrhynchan Eubrachyura" , Richard V. Sternberg, Neil Cumberlidge Jan 2001

"Notes On The Position Of The True Freshwater Crabs Within The Brachyrhynchan Eubrachyura" , Richard V. Sternberg, Neil Cumberlidge

Journal Articles

No abstract provided.

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Using Upper Boundary Constraints To Quantify Competitive Response Of Desert Annuals, Laura M. Lessin, Andrew R. Dyer, Deborah E. Goldberg Jan 2001

Using Upper Boundary Constraints To Quantify Competitive Response Of Desert Annuals, Laura M. Lessin, Andrew R. Dyer, Deborah E. Goldberg

Faculty Publications

Using a target-neighborhood approach with six annual dicot species in the Negev Desert of Israel, we tested whether neighborhood biomass constrained the upper limit of plant performance and if the slope of the upper boundary was correlated to species trait means, such as relative growth rate (RGR) and seed mass. Target individuals were measured in early spring and then collected at the onset of the dry season along with all naturally occurring neighbors within a 5-cm radius of the target. Using a minimum of 50 samples for each of the six target species, we found no significant relationships between target …

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Antioxidants Protect Turkeys Against Toxicity Of Aflatoxin, Roger A. Coulombe Jr. Jan 2001

Antioxidants Protect Turkeys Against Toxicity Of Aflatoxin, Roger A. Coulombe Jr.

Animal, Dairy, and Veterinary Science Faculty Publications

Toxins stemming from mold in feed grains are unavoidable in poultry production. "Mycotoxins" such as aflatoxin B (AFB1) are among the most potent liver-damaging toxins known. AFB1 is also a probable human carcinogen. Poultry are the most sensitive of all farm animals to the toxic effects of even small amounts of AFB1. Although poultry don’t generally live long enough to develop cancers, AFB1-related diseases adversely affect their health. This aflatoxin can cause slowing of growth and decreased resistance to microbial pathogens that make poultry ill. Because these toxins are so pervasive in feed grains, eliminating them has proved either impractical …

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Flora Of Mount Musa (Hatay-Turkey), Atabay Düzenli̇, Hali̇l Çakan Jan 2001

Flora Of Mount Musa (Hatay-Turkey), Atabay Düzenli̇, Hali̇l Çakan

Turkish Journal of Botany

The field studies have been carried out to determine the flora of Mount Musa between 1994-1996. Nearly, 1000 plant specimens were collected. After identification of these specimens, total flora has been determinated as 522 taxa at specific and subspecific ranks belonging to 287 genera and 87 families. The largest three families are Fabaceae (67 species), Asteraceae (55 species) and Lamiaceae (45 species). The largest genus is Trifolium L. (14 species) and the second is Vicia L. (11 species). Mount Musa is take part in the Mediterranean phytogeographical region. The phytogeographical spectrums of species are as follows: Mediterranean elements, 213 species …

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The Low Above-Zero Temperature Effect In The Zone Of Roots On Nitrate Reductase Activity In Pea Organs In The Process Of Vegetating, G. G. Vasilieva, N. V. Mironova, A. K. Glyanko Jan 2001

The Low Above-Zero Temperature Effect In The Zone Of Roots On Nitrate Reductase Activity In Pea Organs In The Process Of Vegetating, G. G. Vasilieva, N. V. Mironova, A. K. Glyanko

Turkish Journal of Botany

Experiments with pea (Pisum sativum L.) cv. Marat) in a phytotron chamber showed that the process of nitrate assimilation in pea organs depends on temperature in the zone of the roots and on the phase of development of the plants. The potential of tissues of different organs for nitrate reduction was compared to the amount of nitrates which they accumalated. A decrease in nitrate reductase activity during certain phases of development is assumed to be related to the process of formation and functioning of nodules.

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The Moss Flora Of Ankara - Kızılcahamam Soğuksu National Park, Güray Uyar, Barbaros Çeti̇n Jan 2001

The Moss Flora Of Ankara - Kızılcahamam Soğuksu National Park, Güray Uyar, Barbaros Çeti̇n

Turkish Journal of Botany

In the Ankara-Kızılcahamam Soğuksu National Park,116 taxa of bryophytes were identified by the authors. These belong to 20 families and 42 genera of bryophytes. Of these, 32 taxa are new for the A2 grid-square in the system adopted by Henderson.

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The Bryophyta Flora Of Giresun Province Centre And Near Vicinity, Turan Özdemi̇r Jan 2001

The Bryophyta Flora Of Giresun Province Centre And Near Vicinity, Turan Özdemi̇r

Turkish Journal of Botany

In this study, 73 taxa were identified by the author. These belong to 28 families and 47 genera of Bryophyta. Of these, 13 taxa (Pogonatum nanum P.Beauv., Encalypta alpina Sm., Tortula norvegica (Web.) Wohl. & Lind., Barbula vinealis Brid., Gymnostomum calcareum Nees & Hornsch., Grimmia donniana Sw., Bryum gemmiparum De Not., Epipterygium tozeri (Grev.) Lind., Pterogonium gracile (Hedw.) Sm., Homalia trichomanoides (Hedw.) B.S.&G., Cratoneuron commutatum (Hedw.) Roth., Scorpiurium circinatum (Brid.) Fleisch. & Loeske, Eurhynchium praelongum var. rigidum Boul.) are new for the A4 grid-square adopted by Henderson & Prentice (1961). In addition, 20 taxa are new records for Giresun province.

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Two New Varieties And A New Record In Onobrychis From Turkey, Ekrem Aktoklu Jan 2001

Two New Varieties And A New Record In Onobrychis From Turkey, Ekrem Aktoklu

Turkish Journal of Botany

Two new Onobrychis Miller (Fabaceae) varieties are described and illustrated from east Anatolia: O. fallax Freyn & Sint. var. longifolia Aktoklu and O. atropatana Boiss. var. grandiflora Aktoklu. Onobrychis meschetica Grossh. is a new record from Turkey; a full description is given.

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Contributions To The Macrofungi Flora Of Bitlis Province, Abdullah Kaya Jan 2001

Contributions To The Macrofungi Flora Of Bitlis Province, Abdullah Kaya

Turkish Journal of Botany

This study was carried out on macrofungi samples collected in Bitlis province between 1997 and 2000. As a result of field and laboratory studies, 60 species belonging to 17 families were identified. Four of them, Coprinus xanthotrix Romagn., Psathyrella atomata (Quél) Fr., Rhodocybe fallax (Quél) Sing. and Polyporus meridionalis (David) Jahn., are new records for Turkey.

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Pollen Flora Of Pakistan-Xxxi Capparidaceae, Anjum Perveen, Mohammad Qaiser Jan 2001

Pollen Flora Of Pakistan-Xxxi Capparidaceae, Anjum Perveen, Mohammad Qaiser

Turkish Journal of Botany

The pollen morphology of 14 species belonging to seven genera viz., Cadaba Forssk., Capparis L., Cleome L., Dipterygium Decaisne, Gynandropsis DC., Maerua Forssk., of the family Capparidaceae, was investigated using a light microscope and scanning microscope. The results confirm the eurypalynous nature of the family. However, palynology is significantly helpful at the specific level. Pollen grains usually radially symmetrical, isopolar, sub-prolate to prolate, generally tricolporate, often tetra-colporate. Tectum generally spinulose, or striate-rugulate, or rugulate-reticulate often sub-psilate.

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New And Poorly Known Genera Of Microfungi For Turkey, Elşad Hüseyi̇n, Faruk Selçuk Jan 2001

New And Poorly Known Genera Of Microfungi For Turkey, Elşad Hüseyi̇n, Faruk Selçuk

Turkish Journal of Botany

The genus Kabatia Bubâk and species K. mirabilis Bubâk var. oblongifoliae Conners are new records for Turkey. The genus Lasiobotrys Kunze and species L. lonicerae (Fr.) Kunze on a new host plant (Lonicera caucasica Pallas) are poorly known in Turkey and are a new record for the Black Sea coast.

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The Origin Of The 'Wild Orchards' Of Central Anatolia, Henk Woldring, Rene Cappers Jan 2001

The Origin Of The 'Wild Orchards' Of Central Anatolia, Henk Woldring, Rene Cappers

Turkish Journal of Botany

Palynological investigations have revealed that the deforestation of Central Anatolia started c. 4000 BP. At present, most of the land is cultivated and only small patches of woodland occur in remote mountain areas. These woodlands are dominated by deciduous oaks ( Quercus L. spp.) or locally by junipers ( Juniperus L. spp.). A pattern of scattered fruit trees, the so-called wild orchards, characterizes the cultivated fields. Another type of arboreal vegetation is found on isolated rock outcrops in the fields. Surveys of the vegetation types show that oaks are uncommon among the fields and on the rock outcrops. By contrast, …

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The Effect Of Glycinebetaine On The Heat Stability Of Photosynthetic Reactions In Thylakoid Membranes, Yagut M. Allakhverdieva, Mahir D. Mamedov, Ralphreed A. Gasanov Jan 2001

The Effect Of Glycinebetaine On The Heat Stability Of Photosynthetic Reactions In Thylakoid Membranes, Yagut M. Allakhverdieva, Mahir D. Mamedov, Ralphreed A. Gasanov

Turkish Journal of Botany

Heat inactivation of various photosynthetic electron transport reactions were investigated in the presence/absence of glycinebetaine (betaine) in unstacked thylakoid membranes from spinach. The activity of Photosystem II (PS II) is more sensitive to heat than that of Cytochrome bf (cyt.bf) and Photosytem I (PS I) complexes. The data obtained clearly demonstrated the protection of PS II and PS I electron transfer by betaine under high temperatures. The phenomena observed are probably related to the stabilization of the higher-order structures of PS II and PS I by betaine.

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Periodical Effect Of Cement Dust Pollution On The Growth Of Some Plant Species, Muhammad Zafar Iqbal, Muhammad Shafiq Jan 2001

Periodical Effect Of Cement Dust Pollution On The Growth Of Some Plant Species, Muhammad Zafar Iqbal, Muhammad Shafiq

Turkish Journal of Botany

A significant reduction in plant cover, height and number of leaves for Carissa carandas L. was observed. Azadirachta indica(L.) A.Juss. showed no significant changes in plant cover and height with the exception of number of leaves. A. indicashowed a significant (p

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Callus Development And Indirect Shoot Regeneration From Seedling Explants Of Sugar Beet ( Beta Vulgarisl.) Cultured In Vitro, Songül Gürel, Ekrem Gürel, Zeki̇ Kaya Jan 2001

Callus Development And Indirect Shoot Regeneration From Seedling Explants Of Sugar Beet ( Beta Vulgarisl.) Cultured In Vitro, Songül Gürel, Ekrem Gürel, Zeki̇ Kaya

Turkish Journal of Botany

For callus production, hypocotyl, cotyledon, petiole and leaf explants from seedlings of different sugar beet ( Beta vulgaris L.) breeding lines were cultured on MS medium containing BAP or KIN in combination with NAA or 2,4-D at 0.0, 0.5 or 1.0 mg/l. The use of both auxins in combination with 0.5 mg/l BAP or 0.5 mg/l KIN resulted in greater amounts of callus from all types of explants. However, hypocotyl and cotyledon explants produced significantly more callus than petiole and leaf explants when the means of all lines were taken into account. Two types of callus were usually obtained, white …

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Pollen Flora Of Pakistan - Xxvi. Balsaminaceae, Anjum Perveen, Mohammad Qaiser Jan 2001

Pollen Flora Of Pakistan - Xxvi. Balsaminaceae, Anjum Perveen, Mohammad Qaiser

Turkish Journal of Botany

The pollen morphology of 8 species belonging to a single genus, i.e., Impatiens L., of the family Balsaminaceae, was studied by light microscope and scanning microscope. It is stenopalynous in nature. Pollen grains oblate to sub-oblate, rectangular, tetra-colpate, colpi very short (brevicolpate). Tectum reticulate. Palynology of the family confirms its monotypic status.

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Evaluation Of A Method For The Reassessment Of Air Quality By Lichen Mapping In The City Of İzmir, Turkey, Maja Sommerfeldt, Volker John Jan 2001

Evaluation Of A Method For The Reassessment Of Air Quality By Lichen Mapping In The City Of İzmir, Turkey, Maja Sommerfeldt, Volker John

Turkish Journal of Botany

The occurrence of lichens and air pollution in the city of İzmir were investigated according to VDI-Guideline 3799 Part 1. In all, 45 epiphytic lichen species were found in 1092 releves. Different distribution patterns discriminated in the study area were used to evaluate air quality. A predominant part of the city area is heavily polluted; this pollution decreases in green spaces and in the outer zone of the study area. The best air quality values were determined in the southern and western parts of the city zone. A value of 7.3 for the width of the air quality classes shows …

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The Clypeate Pollen Grains Of Turkish Iris L. (Iridaceae): Subgenus Scorpiris Sach, Emel Oybak Dönmez, Münevver Pinar Jan 2001

The Clypeate Pollen Grains Of Turkish Iris L. (Iridaceae): Subgenus Scorpiris Sach, Emel Oybak Dönmez, Münevver Pinar

Turkish Journal of Botany

The clypeate pollen grains of some species of Turkish Iris L. (Iridaceae) taxa belonging to the subgenus Scorpiris Spach have been investigated. Attention is given to characteristics of exine sculpturing and the exine shields using light microscopy and scanning electron microscopy. The pollen grains of the Scorpiris are shown to be uniform, especially with regard to pollen shape and exine sculpturing. However, a trend towards greater pollen size accompanied by higher exine shield number is noted from the less specialised taxa to the more specialised taxa. It is also considered that the clypeate pollen type is unique to subgenus Scorpiris …

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