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Using Omissive Faults To Obtain Local Convergence In Partially Connected Networks, M. H. Azadmanesh, A. W. Krings

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Approximate Agreement is an important issue in fault-tolerant distributed computing where non-faulty processes exchange and vote upon their local values, to arrive at values which are within the range of the initial values of the non-faulty processes and within a predefined tolerance of each other. Results to date in Approximate Agreement, however, are not capable of exploiting omission faults. Omission faults are presumed not to occur or a predefined default value is substituted for those values not received, or they are globally discarded before the voting algorithm executes. As a result, hybrid fault models can not differentiate between omissive and …

The Behavior Of Preweanling Pups Exposed To Valproate In-Utero, Wayne Briner

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Valproate is a known human and animal teratogen that produces neural-tube defects. Valproate is also known to produce fetal death and a variety of fetal deformities. The present study considered the role of val pro ate as a behavioral teratogen in rats. Pregnant rats were administered saline or valproate, or simply handled at 10 days gestation and the offspring tested for a variety of behaviors and physical measures. Valproate-exposed animals demonstrated lags in the emergence of swimming behavior, negative geotaxis and weight gain. This evidence points to val pro ate being a behavioral teratogen producing delays in neuromuscular development.

A Key To Dicotyledonous Rosettes Of Eastern Nebraska, Phillip D. Moore

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

This paper provides a key to the identification of rosettes of 113 species of 56 genera of dicotyledonous flowering plants in eastern Nebraska. The key is based on observations of fresh and dried specimens collected from 1977 to 1990. Rosettes were identified from personal experience, by growing seeds or transplanted rosettes in a greenhouse, or by comparison and association with mature plants found growing with the rosettes. Key characteristics taken from dried specimens included leaf shape, leaf size, marginal configuration, surface vestiture, venation pattern, and subterranean morphology while characteristics observed in the field included distribution, habitat, odor, and presence or …

New Floristic Records For Nebraska-5, Steven B. Rolfsmeier, Robert F. Steinauer, David M. Sutherland

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Recent field and herbarium studies have revealed the presence of 57 species, two varieties, and three hybrids of vascular plants and one moss not previously published with verification from Nebraska. Twenty-eight taxonomic entities are considered likely native in Nebraska, including: xAchnella caduca, Arabis divaricarpa, Aster ascendens, Atriplex suckleyi, Callitriche heterophylla, Campylium stellatum, Carex hirtifolia, Carex lasiocarpa var. americana, Chenopodium cycloides, C. pallescens, Dioscorea quaternata, Draba brachycarpa, Eleocharis wolfii, Elatine brachysperma, Elodea bifoliata, xElyhordeum iowense, xElyhordeum montanense, Eragrostis secundiflorus ssp. oxylepis, Erigeron lonchophyllus, Houstonia pusilla, Maianthemum canadense, Mirabilis exaltata, Myosotis verna, Pedicularis crenulata, Plantago rhodosperma, Potentilla simplex, Scutellaria parvula var. parvula …

The Brine Shrimp Artemia Franciscana In Closed Microalgal-Based Microcosms (Biospheres), Rachel L. Yung, Mark A. Gouthro, James R. Rosowski

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

The purpose of this study was to examine the effects of three experimental variables on the stability and fecundity of a brine-shrimp community in a closed, micro algal-based microcosm. Xenic microalgal cultures and brine shrimp (Artemia franciscana Kellogg) in 300-cc acrylic spheres (referred to as biospheres or microcosms) were subjected to three experimental variables: (1) the culture volume (150 ml or 250 ml), (2) presence or absence of daily culture mixing (sphere rotation), and (3) a microcosm atmosphere that was either closed or open to the surrounding atmosphere. Each sphere started with 200 brine shrimp cysts and the microalga …

Tertiary Bats (Mammalia: Chiroptera) From Northern Nebraska, Nicholas J. Czaplewski, Bruce E. Bailey, Richard G. Corner

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Scarce remains of bats are reported from five localities in northern Nebraska in which other kinds of vertebrates are much more common. ?Oligomyotis or ?Myotis, possibly of an undescribed species, is represented by fragments of jaws and humeri from an early Arikareean (late Oligocene) locality in Dawes County. Several toothless jaw fragments from the late Hemingfordian (middle Miocene) Companion Quarry in Sioux County represent an indeterminate microchiropteran. An indeterminate species of Myotis was encountered in the middle Clarendonian (late Miocene) Ashfall site in Antelope County. A hairy-tailed bat, Lasiurus sp. indet., occurred in late Clarendonian (late Miocene) …

The Pleasing Fungus Beetles (Coleoptera: Erotylidae) Of Nebraska, Michael A. Goodrich, Charles A. Springer

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

The known Nebraska fauna of the family Erotylidae is composed of 13 species included within five genera. The species are: Dacne quadrimaculata (Say), Megalodacne fasciata (Fabricius), Ischyrus q. quadripunctatus (Olivier), Triplax californica antica LeConte, Triplax flavicollis Lacordaire, Triplax frontalis Horn, Triplax frosti Casey, Triplax thoracica Say, Tritoma angulata Say, Tritoma biguttata affinis Lacordaire, Tritoma humeralis Fabricius, Tritoma pulchra Say and Tritoma sanguinipennis (Say). Six other species not yet recorded from Nebraska, but which may occur in the state, are included in the key and species descriptions.

Microhabitat Preferences Of Bullfrog Tadpoles (Rana Catesbeiana) Of Different Ages, Geoffrey R. Smith

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

I experimentally investigated the habitat use preferences of bullfrog (Rana catesbeiana) tadpoles of different ages (early, first-year vs. late, second-year, premetamorphic) in the laboratory. Early tadpoles showed a preference for non-vegetated areas, whereas late tadpoles showed no preference. Early tadpoles were seen more often over small, gravel substrate as opposed to large rocks, whereas late tadpoles showed no preference. Early tadpoles preferred medium depths, whereas later tadpoles preferred deeper water. Thus, it appears there may be habitat preferences in bullfrog tadpoles, and that these preferences may change over time.

Transactions Of The Nebraska Academy Of Sciences Table Of Contents: Volume 25 (1999)

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Editorial Contents

Nebraska Academy of Sciences Officers, Policy Committee ................. ii

Editorial Board ................. iv

Membership Objectives and Friends of the Academy ................. v

Nebraska Association of Teachers of Science ................. vi

Preparation of manuscripts ................. inside back cover

Papers

Using omissive faults to obtain local convergence in partially connected networks (M. H. Azadmanesh and A. W. Krings) ................. 1

New floristic records for Nebraska-5 (Steven B. Rolfsmeier, Robert F. Steinauer, and David M. Sutherland) ................. 15

A key to dicotyledonous rosettes of eastern Nebraska (Phillip D. Moore) ................. 23

The brine shrimp Artemia franciscana in closed microalgal-based microcosms (biospheres) …