273 research outputs found
EC03-101 Nebraska Seed Guide, 2004
This circular is a progress report of corn hybrid performance tests conducted by the Agronomy/Horticulture Department and the Northeast, South Central, West Central and Panhandle Research and Extension Centers of Nebraska and University of Wyoming at Torrington. Conduct of experiments and publication of results is a joint effort of the Agricultural Research Division and the Cooperative Extension Service
EC03-101 Nebraska Seed Guide, 2004
This circular is a progress report of corn hybrid performance tests conducted by the Agronomy/Horticulture Department and the Northeast, South Central, West Central and Panhandle Research and Extension Centers of Nebraska and University of Wyoming at Torrington. Conduct of experiments and publication of results is a joint effort of the Agricultural Research Division and the Cooperative Extension Service
NF539 Yield Suppressions of Glyphosate-Resistant (Roundup Ready) Soybeans
Research description and results of testing for effect of glyphosate herbicide application and the effect of the glyphosate-resistant gene in soybean production. Glyphosate is a popular postemergence herbicide. Glyphosate-resistant soybean technology is gaining acceptance in Nebraska and in U.S. cropping systems; however, potential yield suppression from either genetic differences among varieties, the glyphosate-resistant gene/gene insertion process, or glyphosate is a concern. The first of these could contribute to a yield lag; the latter two could contribute to a yield drag. Research Goals We designed experiments to test for both elements of yield drag: the effect of glyphosate herbicide application and the effect of the glyphosate-resistant gene. Since we could not distinguish between yield drag associated with the glyphosate-resistant gene or effects of its insertion, reference to this gene in the following could mean either or both of these possibilities. Two experiments were conducted at each of four Nebraska locations for two years with the intent to: 1) investigate the glyphosate herbicide effect on 12-13 varieties; and 2) look at the effect of the glyphosate-resistant (glyphosate-resistant) gene on five pairs of glyphosate- resistant, nonglyphosate-resistant sister cultivars (eight other cultivars were included as checks). Summary: Yield suppressions were observed. Yield drag from glyphosate application was not observed. Yield drag from glyphosate-resistant gene = 5 percent. Yield lag from variety genetic differences =
Empirijski kinetički model hidrolize proteina belanceta pretretiranih ultrazvučnim talasima visoke frekvencije
The subject of this paper was the examination of the influence of enzyme and
substrate concentrations and temperature on the initial reaction rate of hydrolysis of the
egg white catalyzed with Alcalase 2.4 L (Protease from Bacillus licheniformis). The
main objective of this paper was investigating the effect of the ultrasound on the
reaction rate of hydrolysis and modeling of enzymatic process of hydrolysis of the egg
white protein in order to develop the process and design the enzyme reactor. The
substrate in this reaction was 10 % w/w solution of egg white pretreated with ultrasound
waves the frequency of 35 kHz during 30 min. Proper kinetic model with substrate
inhibition and the enzyme inactivation were applied to the results and good congruence
between model and experimental data was achieved. The calculated kinetic constants
indicate that the ultrasonic pretreatment causes an increase in the degree of hydrolysis
of the enzyme reaction.U ovom radu ispitivan je uticaj koncentacije enzima, supstrata i temperature
na početnu brzinu reakcije hidrolize proteina belanceta katalizovane Alkalazom 2,4 L
(proteaza iz Bacillus licheniformis). Glavni cilj ovog istraživanja bio je ispitivanje
uticaja ultrazvučnih talasa na brzinu reakcije hidrolize, kao i modelovanje enzimskog
procesa hidrolize proteina belanceta u cilju dobijanja projektnih jednačina neophodnih
za projektovanje i dizajn enzimskog reaktora. Kao supstrat korišćen je 10 % w/w rastvor
belanceta prethodno tretiran ultrazvučnim talasima frekvencije 35 kHz u toku 30
minuta. Dobijeni eksperimentalni rezultati modelovani su kinetičkim modelom koji
uzima u obzir inhibiciju supstratom i deaktivaciju enzima. Predloženi kinetički model
dao je dobro slaganje sa dobijenim eksperimentalnim rezultatima. Izračunate kinetičke
konstante ukazuju da pretretman ultrazvučnim talasima dovodi do povećanja stepena
hidrolize
Antioksidativna aktivnost hidrolizata belanceta i njegovih frakcija dobijenih membranskom ultrafiltraciom
Bioactive peptides with different biological properties can be obtained by egg white
proteins hydrolysis. In this study we used the high intensity ultrasound pretreatment of
the egg white proteins that were then hydrolyzed by different types of proteases in the
one-step and two-step procedure. Membrane ultrafiltration into molecular size of 1 kDa,
10 kDa and 30 kDa was used to separated the obtained hydrolzyates and antioxidative
activities of obtain fractions were studied. Between fractions less than 1 kDa, containing
bioactive peptides, the ultrasound pretreated hydrolyzate obtained by using alcalaseflevorzyme
in a two-stage procedure has shown the highest antioxidant activity.Hidrolizom proteina belanceta dobijaju se bioaktivni peptidi koji imaju
različita biološka svojstva. U ovom radu korišćena je tehnologija ultrazvuka visokog
intenziteta kao pretretman pripreme proteina belanceta koji su zatim hidrolizovani
različitim vrstama proteaza u jednostepenom i dvostepenom postupku. Dobijeni
hidrolizati su razdvojeni korišćenjem ultrafiltracionih membrana promera 1, 10 i 30 kDa
i dobijenim frakcijama je ispitana antioksidativna aktivnost. Među frakcijama veličine
manje od 1 kDa koje sadrže bioaktivne peptide, najveću antioksidativnu aktivnost je
pokazao ultrazvučno pretretiran hidrolizat nastao delovanjem alkalaza-flevorzima u
dvostepenom enzimskom postupku
EC05-130 Guide for Weed Management in Nebraska
One of the major thrusts of all University of Nebraska weed science faculty is the Guide for Weed Management in Nebraska. This guide is not just the work of one or two people, rather it is a joint effort of all the authors to produce a comprehensive, information-packed resource. Each weed science faculty member is responsible for particular sections of the guide. The process of reviewing the current content, checking labels and research data and updating the content can be an extensive process. Each year new herbicide active ingredients and trade names are introduced and figuring out what a herbicide is and what it can control can be a sizeable task. The authors also meet twice a year to discuss feedback from readers, how the current guide is being used, and what changes should be made in the future. This circular deals principally with herbicides as an aid for crop production. The suggestions for use are based on results at Nebraska research centers and elsewhere. Consult product labels for additional information
Guide for Weed Management in Nebraska
Each year we strive to provide a publication that is updated, informative, and easy to use. Last year’s edition has been revised to include the latest research-based information and several new sections outlined below. We hope you find these revisions useful and that they make this guide an even better resource than the previous edition
Guide for Weed Management in Nebraska
Each year we strive to provide a publication that is updated, informative, and easy to use. Last year’s edition has been revised to include the latest research-based information and several new sections outlined below. We hope you find these revisions useful and that they make this guide an even better resource than the previous edition
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