Life Sciences Commons^™

F00-416 Sewing With Silky Textured Fabrics, Rose Marie Tondl

University of Nebraska-Lincoln Extension: Historical Materials

This NebFact discusses a variety of uses for silky textured fabrics.

2000 Nebraska Swine Report, Rodger K. Johnson

University of Nebraska-Lincoln Extension: Historical Materials

This publication was prepared by the staff in Animal Science and cooperating Departments for use in Extension, Teaching and Research programs. It deals with the results that were done in reproduction, breeding, health, nutrition, economics and housing of swine.

G1419 Community Supported Agriculture, Paul Swanson

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide explains what community supported agriculture is, how it works and what producers will need to do to participate.

Most Nebraskans have not heard of Community Supported Agriculture (CSA) but the concept is about three decades old in Japan and Europe and about 10-15 years old on the east coast of the United States.

In Japan, because of continued loss of farmland to urbanization and the migration of farmers to the city, a group of women approached local farm families with the idea of direct marketing produce from area farms to urban residents. This created an alternative distribution system …

G1398 Corn Grain Yield And Kernel Weight Stability After Black Layer, Fred W. Roeth, Roger Wesley Elmore

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide disputes previous reports that corn yields are reduced after black layer if harvest is delayed.

An October 1995 article in a national farm publication reported that corn dry matter decreased 1 percent for every percent loss in rain moisture as corn dried in the field after black layer (physiological maturity). The dry matter loss reportedly was hybrid specific and possibly due to seed respiration. This observation was based on research conducted at Purdue University with three hybrids over four years. All hybrids tested had significant dry matter losses in three of the four years. A report of similar …

G1374 Escherichia Coli: Testing For Process Control Verification,, Mindy Brashears, Dianne Peters

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide was developed to help processors correctly perform carcass sampling in meat and poultry operations and interpret the results.

In July 1996, the U.S.D.A. published the Final Rule on Pathogen Reduction for meat and poultry processing facilities. Its goal is to reduce the occurrence of food-borne pathogens in meat and poultry products. The rule requires carcass sampling for "generic" E. coli in meat and poultry slaughter operations. The U.S.D.A. has developed guidelines for acceptable, marginal and unacceptable amounts of E. coli to be used by the processor to determine if their process is controlling microbial hazards. If E. coli …

G1408 Grain Molds And Mycotoxins In Corn, Jim Stack

University of Nebraska-Lincoln Extension: Historical Materials

Storage molds of corn occur in Nebraska annually, potentially lowering grain quality. Mycotoxin contamination of corn occurs periodically, potentially affecting human and animal health. Learn how to identify the different types and their effects. Introduction In Nebraska, grain molds occur every year to varying degrees on field corn, seed corn, white corn, and other specialty corn hybrids. Most grain mold pathogens become associated with the kernel in the field; however, under certain conditions of temperature, relative humidity, and grain moisture, these molds can grow within the colonized kernel and even spread to adjacent kernels during transport and storage. Several issues …

G1402 Preharvest Soybean Marketing Strategies, James G. Kendrick, George H. Pfeiffer, Roger Wilson, David J. Drozd

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide provides strategies for using the futures market to obtain higher prices for soybeans. Soybean producers who decide to use the futures market to price their crop are immediately faced with a number of decisions. Should a futures contract be used as a hedge to "lock in" a price, or should an options contract be used to establish a floor price? When should the position be established? Which futures contract month is most appropriate? The many decisions facing those using the futures market may be a reason some have decided not to use it at all. The University of …

Nf00-437 Setting Up Your Own Business Spotting Business Opportunities Among Scams, Carol Thayer

University of Nebraska-Lincoln Extension: Historical Materials

This NebFact provides advice for entrepreneurs in selecting viable business opportunities.

Nf00-445 Creating A Strong Family: Successful Management Of Stress And Crisis, John Defrain

University of Nebraska-Lincoln Extension: Historical Materials

Research with strong families shows how they approach difficult times and overcome them.

Mp78 2001-2002 Nebraska Dairy Report

University of Nebraska-Lincoln Extension: Historical Materials

Annual Report of University of Nebraska-Lincoln Dairy Research for 2001-2002. Topics include:

Optimal Replacement of Forage and Concentrate with a New Wet Corn Milling Product for Lactating Dairy Cows

Evaluation of Alternative Sources of Rumen Undegradable Protein with Wet Corn Milling Products for Dairy Cattle

Effect of Wet Corn Gluten Feed on Growth and Nutrient Digestibility of Dairy Heifers

Quality of Corn Silage and Wet Corn Gluten Feed Ensiled Together in Mini Silos

Use of Bt Corn Silage and Grain by Lactating Dairy Cattle

Effect of Nonenzymatically Browned Sunflower Seeds on Ruminal Fermentation and Milk Composition

Carbohydrate Composition of Commonly …

Instructions For Authors, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Abstracts From The Student Presentations Of The Arkansas Chapter Of Gamma Sigma Delta, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Contents, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Comparing Species Of Bees For Controlled Pollination Of Helianthus Petiolaris In Field Cages, R. L. Wilson, C. A. Abel, M. E. Brothers

Journal of the Iowa Academy of Science: JIAS

Honey bees, Apis mellifera, have been used for several years to pollinate caged plant species maintained at the USDA-ARS North Central Regional Plant Introduction Station (NCRPIS), Ames, Iowa. Because maintaining large numbers of honey bees is expensive and time consuming, we began looking in 1995 for other pollinator species that can be easily managed and less expensive to maintain than A. mellifera. One species we tested was the hornfaced bee, Osmia cornifrons, a solitary bee imported from Japan in the late 1970s. We also tested a mixture of native bumblebees, Bombus bimaculatus and B. impatiens, which are native to the …

The Status Of The Blacknose Shiner (Notropis Heterolepis) Tn Iowa: A Preliminary Survey, Neil P. Bernstein, Michael Getting, Timothy Kamp, Stevenson Christain, Ryan Smith, Joseph Steele, Steven Steele

Journal of the Iowa Academy of Science: JIAS

During the last 45 years, the blacknose shiner (Notropis heterolepis) has been restricted to a three county area in northwestern Iowa. We surveyed locations where this siltation-intolerant species had been captured to update the status of the fish in the state. Streams were blocked with nets on both the upstream and downstream ends of sample areas, and fish were collected with a backpack electrofisher and seines. Lakes where the blacknose shiner had been found were also sampled. No blacknose shiners were found and several possible explanations are offered for their absence from historical sites.

Editorial Board & Iowa Academy Of Science Officers And Directors

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Back Cover

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Distribution And Abundance Of Three Freshwater Mussel Species (B1valv1a: U Ntontdae) Correlated With Physical Habitat Characteristics In An Iowa Reservoir, J. R. Straka, J. A. Downing

Journal of the Iowa Academy of Science: JIAS

A rapid drawdown (weeks) of a reservoir allowed us to determine the combined influence of water depth, maximum effective fetch, bottom slope, and substrate characteristics on abundance of three species of freshwater mussels. The three principal mussel species were significantly (PPyganodon grandis(Say) was most abundant on deeper shelves (ca. 3 m depth, slope 1 km), and sediment organic matter content was moderate (Lampsilis siliquoidea(Barnes), however, was most abundant in shallow water (Potamilus alatus(Say) had a more cosmopolitan depth distribution, but was found only on bottoms with low slope (Pyganodon grandiswas found to be negatively affected by increasing substrate organic matter …

Population Size Estimates For The Endangered Iowa Pleistocene Snail, Discus Macclintocki Baker, Tama K. Anderson

Journal of the Iowa Academy of Science: JIAS

Discus macclintocki Baker, the Iowa Pleistocene snail, is a federally endangered species found only on algific talus slopes in northeastern Iowa and northwestern Illinois. Population size estimates for fourteen D. macclintocki populations in Iowa and Illinois ranged from 182 to 22,125 individuals. Estimates from the program CAPTURE as well as Bayesian estimation procedures gave similar results, although the Bayesian method allowed estimation of populations that could not be estimated with CAPTURE due to small sample sizes. A comparison of two methods of sampling, visual counts of quadrats and cover boards, showed that using cover boards resulted in much higher probabilities …

Editorial Board & Iowa Academy Of Science Officers And Directors

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Table Of Contents

Journal of the Iowa Academy of Science: JIAS

No abstract provided.

Morphological Abnormalities In Illinois Cricket Frogs, Acris Crepitans, 1968-71, Robert H. Gray

Journal of the Iowa Academy of Science: JIAS

Reports of malformed amphibians have been increasing, including external deformities such as missing or extra arms and legs, missing eyes and mandibles, and internal abnormalities involving the bladder, digestive system, and testes. Natural phenomena such as limb amputations during predation attempts by other animals, parasitism, xenobiotic chemicals (herbicides, insecticides, fertilizers and others), and UV-B or other radiation (either directly or indirectly by triggering production of toxicants from nontoxic chemicals) have all been linked to amphibian abnormalities. From 1968-71, I studied the natural history, effective breeding size, and seasonal, annual, and geographic variation in color morph frequencies of cricket frogs (Acris …

Field Investigations Of Malformed Frogs In Minnesota 1993-97, Judy C. Helgen, Mark C. Gernes, Susan M. Kersten, Joel W. Chirhart, Jeff T. Canfield, Dorothy Bowers, Jon Haferman, Robert G. Mckinnell, David M. Hoppe

Journal of the Iowa Academy of Science: JIAS

Reports of malformed frogs were made to the Minnesota Pollution Control Agency (MPCA) from different parts of Minnesota in 1993, 1995, 1996, and 1997 and one, nine, 190, and 172 reports were received, respectively. MPCA field crews and Drs. Hoppe and McKinnell documented malformed frog locations starting in 1993. By 1997, MPCA field crews documented malformed frogs at 62 locations in Minnesota, in 29 of 87 counties. Most malformations were in young metamorphs of Rana pipiens but they were observed also in R. clamitans, R. septentrionalis, R. sylvatica, Bufo americanus, and Hyla spp. Frequencies of malformations varied by time of …

Effects Of Pcb 126 And Ammonia, Alone And In Combination, On Green Frog (Rana Clamitans) And Leopard Frog (R. Pipiens) Hatching Success, Development, And Metamorphosis, Mariana Beatriz Jofre, Michele L. Rosenshield, William H. Karasov

Journal of the Iowa Academy of Science: JIAS

The Green Bay watershed in Wisconsin is polluted with polychlorinated biphenyls (PCBs), dioxin, heavy metals, ammonia, and over 100 organic contaminants. In this study we exposed embryos and larvae of two ranid species commonly occurring in the Green Bay ecosystem, the green frog (Rana clamitans) and the leopard frog (R. pipiens), to PCB 126 (3,3', 4,4', 5-Pentachlorobyphenil, nominal concentrations 0-50 μg/l, two control treatments: water plus 0.08% acetone as carrier for the PCB, water alone), unionized ammonia (0-2 mg/I), and mixtures of both contaminants. Exposure to PCB 126 did not cause significant mortality of embryos before hatching. However, exposure to …

The North American Reporting Center For Amphibian Malformations, Douglas H. Johnson, Suzanne C. Fowle, Jeffrey A. Jundt

Journal of the Iowa Academy of Science: JIAS

The North American Reporting Center for Amphibian Malformations was established to provide a conduit of information about, and a systematic data base on, malformed amphibians. This article describes the Reporting Center and the variety of features available at its Web site, presents an example of a summary analysis that can be conducted with its data, discusses caveats about the data, and makes recommendations about systematic surveys to better understand patterns and trends in the incidence of malformed amphibians.

Demographic And Reproductive Characteristics Of A Southern Illinois Population Of The Crayfish Frog, Rana Areolata, Michael Redmer

Journal of the Iowa Academy of Science: JIAS

Demographic (snout-vent length, skeletochronologically estimated age) and reproductive (fecundity, ova size) characteristics were examined in Riina areolata from Williamson County, Illinois. Fifty-nine frogs (36 males, 23 females) were sampled from breeding choruses in March 1996. Hematoxylinophilic annular lines of arrested growth (LAG) were detected in the diaphyses of cross-sectioned phalanges of all sampled frogs. t-tests revealed that male age (mean = 3.53 yr) and female age (mean = 3.83 yr) were not significantly different, but male SVL (mean = 82.78 mm) was significantly smaller than that of females (mean = 89.61 mm). There were positive correlations between SVL and age …

Density-Dependent Effects On Microhabitat Selection And Activity Of Two Species Of Larval Ambystoma Salamanders, Jeanette M. Jaskula, Robert Brodman

Journal of the Iowa Academy of Science: JIAS

To be able to distinguish unnatural amphibian declines from natural population fluctuations we need a better understanding of the mechanisms that affect amphibian community structure. Larval pond-breeding salamanders exhibit density-dependent effects on population parameters, but little is known of the effect of density on behaviors that mediate interactions. Two species, Amby1toma tigrinum (tiger salamander) and A. laterale (blue-spotted salamander), were evaluated in laboratory aquaria for intraspecific and interspecific interactions that affect microhabitat selection and activity. Microhabitat selection was studied by partitioning containers into microhabitats that either contained or lacked refuges, and movement was recorded over a hexagonal grid to determine …

Frog And Toad Population Monitoring In Michigan, Lori G. Sargent

Journal of the Iowa Academy of Science: JIAS

A volunteer-based monitoring project for frog and toad populations in Michigan was initiated in 1996. The survey protocols developed by the North American Amphibian Monitoring Program (NAAMP) were used and modified to suit the needs of the Michigan project and because of the highly variable Michigan spring weather. The modifications include route establishment, recommended dates during which surveys are conducted, and a more specific definition of population indices. Development of the project included training workshops for volunteers.

Herpetofaunal Abundance And Distribution In Northern Minnesota: Contributions Of Ecological Land Units And Assessment Of Sampling Methodology, Gabrielle Yaunches, S. R. Winterstein, H. Campa Iii, B. J. Kernohan, J. B. Haufler

Journal of the Iowa Academy of Science: JIAS

Herpetofaunal species distributions need to be understood and mapped using landscape descriptions that incorporate important habitat features and ecological processes. An ecosystem management effort in northern Minnesota is characterizing a landscape as a coarse filter for ecological communities. The coarse filter approach involves looking at communities in different successional stages and habitat types in a region (Haufler et al. 1996). Documenting distributions and abundances of herpetofauna using this coarse filter approach will allow data about these species to be incorporated in landscape planning efforts.

Conclusions Drawn From The Malformity And Disease Session, Midwest Declining Amphibians Conference, 1998, Michael J. Lannoo

Journal of the Iowa Academy of Science: JIAS

While the general problem of amphibian declines is well known, no issue recently has engendered as much concern by the public as amphibian malformities (Ouellet et al. 1996, Tietge 1996, Gray 1998, Helgen et al. 1998a and 1998b, D. Johnson 1998, T. Johnson 1998, Meteyer and Converse 1998). As a result, Gary Casper, Chris Phillips and I decided to assemble this symposium. The session was open to anyone who wished to participate. Nineteen papers were presented (there was one cancellation) and a panel discussion followed. I will organize this summary of, and conclusions drawn from, our symposium into two sections: …