Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

University of Nebraska - Lincoln

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 32851 - 32880 of 40091

Full-Text Articles in Entire DC Network

Management Of Conflicts Between Urban Coyotes And Humans In Southern California, Rex O. Baker, Robert M. Timm Mar 1998

Management Of Conflicts Between Urban Coyotes And Humans In Southern California, Rex O. Baker, Robert M. Timm

Vertebrate Pest Conference Proceedings: 18th (1998)

An apparent increase in coyote-human conflicts, notably attacks on humans, demonstrates that such incidents are not rare in California. The authors discuss coyote attacks on 53 humans, resulting in 21 instances of human injury, over the last decade. These illustrate repeated, predictable pre-attack coyote behavior patterns. Specific changes in human environments and in human behavior that have contributed to coyote attacks are discussed. Case histories of attacks reveal contributing factors and suggest appropriate corrective and preventive actions. Padded leghold traps have been the most effective and efficient tool in removing problem coyotes and changing the behavior of coyotes to fear …


Documentary Editing, Volume 20, Number 1, March 1998. Mar 1998

Documentary Editing, Volume 20, Number 1, March 1998.

Documentary Editing: Journal of the Association for Documentary Editing (1979–2011)

No abstract provided.


A New Species Of Acmaeodera (Coleoptera: Buprestidae) From Big Bend National Park, Texas, With Synonymy For Other Species Occurring In The United States, Richard L. Westcott, William F. Barr Mar 1998

A New Species Of Acmaeodera (Coleoptera: Buprestidae) From Big Bend National Park, Texas, With Synonymy For Other Species Occurring In The United States, Richard L. Westcott, William F. Barr

Insecta Mundi

Acmaeodera tiquilia Westcott and Barr, new species, from Big Bend National Park, Texas is described, figured, and discussed in considerable detail, particularly in relation to the similar and partially sympatric A. recticollis Fall. A neotype is designated for A. quatuordecimspilota Obenberger and that species is synonymized with A. ornata (Fabricius). Additionally, A. gibbula gila Knull is synonymized with A. gibbula LeConte; A. nautica Van Dyke is synonymized with A. simulata Van Dyke.


A Revision Of The Neotropical Predaceous Midges Of Brachypogon (Brachypogon) Kieffer (Diptera: Ceratopogonidae), Gustavo R. Spinelli, William L. Grogan Jr. Mar 1998

A Revision Of The Neotropical Predaceous Midges Of Brachypogon (Brachypogon) Kieffer (Diptera: Ceratopogonidae), Gustavo R. Spinelli, William L. Grogan Jr.

Insecta Mundi

This revision of the Neotropical predaceous midges of the genus Brachypogon (Brachypogon) Kieffer, recognizes 18 extant species, including the following 12 new species: Brachypogon (B.) apunctipennis, bifidus, bimaculatus, ecuadorensis, ethelae, insularis, monicae, pseudoparaensis, schmitzi, spatuliformis, telesfordi, and woodruffi. Two species groups are recognized, the fuscivenosus and irnpar groups. The hitherto unknown male of B. paraensis Wirth & Blanton is described and illustrated, and the female of that species as well as both sexes of B. impar (Johannsen) and B. fuscivenosus (Lutz) are redescribed and illustrated. Diagnoses are provided for previously described species, as well as a key for the …


Redescriptions, New Combinations, Synonymies, And New Records Of South American Lepturini (Coleoptera: Cerambycidae: Lepturinae), Osvaldo Di Iorio Mar 1998

Redescriptions, New Combinations, Synonymies, And New Records Of South American Lepturini (Coleoptera: Cerambycidae: Lepturinae), Osvaldo Di Iorio

Insecta Mundi

Some Neotropical Lepturini are studied: Euryptera latipennis Audinet-Serville, 1828 (type species) redescription, Strangalia dimidiata (Redtenbacher, 1868) new combination (=Strangalia melanophthisis (Berg, 1889) new combination, new synonymy, and lectotype designation), Strangalia fulvicornis (Bates, 1872) new record from Argentina; Strangalia melanura (Redtenbacher, 1868) new combination from Brazil; Strangalia rubricollis (Bates, 1870) new record from Peru. "Leptura" bonariensis Burmeister, 1865 is not a true Leptura, being exotic for Argentina and for the Neotropical fauna; the type-specimen was mislabeled as coming from Buenos Aires. Elytral patterns, posterior tarsi, antennae, 5th apparent urosternite, and elytral apices of E. latipennis, and …


Biting Midges From Dominican Amber. Iii. Species Of The Tribes Culicoidini And Ceratopogonini (Diptera: Ceratopogonidae), Ryszard Szadziewski, William L. Grogan Jr. Mar 1998

Biting Midges From Dominican Amber. Iii. Species Of The Tribes Culicoidini And Ceratopogonini (Diptera: Ceratopogonidae), Ryszard Szadziewski, William L. Grogan Jr.

Insecta Mundi

The following 10 new species of biting midges are described and illustrated from Dominican amber: Culicoides (Oecacta) antilleanus, C. (0.) brodzinskyi, C. (0.) ambericus, C. (0.) hispanicolus, C. mammalicolus, Brachypogon (B.) americanus, B. (Isohelea) dominicanus, B. (Isohelea) pronainuloides, Stilobezzia (S.) antilleana and S. (Acanthohelea) dominicana. Two other species, in Nannohelea and Stilobezzia, are described but not named. Stilobezzia (Acanthohelea) wirthicola is a new name for Stilobezzia (A.) succinea Szadziewski from Miocene Saxonian amber, which is preoccupied by the extant Stilobezzia succinea Ingram and Macfie, from Argentina.


A New Potamobates Champion Species (Heteroptera: Gerridae) From Ecuador With New Distribution Records For P. Williamsi Hungerford, Anthony I. Cognato Mar 1998

A New Potamobates Champion Species (Heteroptera: Gerridae) From Ecuador With New Distribution Records For P. Williamsi Hungerford, Anthony I. Cognato

Insecta Mundi

Abstract: Potamobates sumaco new species is described from the Ecuadorian Amazon. Male and female genitalia differentiate P. sumaco from a similar parapatric species, P. williamsi Hungerford. Phylogenetic analysis indicates P. sumaco is closely related to the species of the P. tridentatus group which includes P. williamsi. A distribution map and revised key to Potamobates species are provided.

Resumen: Se describe Potamobates sumaco nueva especies del Amazonas Ecuatoriano. Los genitales del macho y la hembra distinguen P. sumaco de la especie mas cercana P. williamsi Hungerford. El analisis filogenetico indica que P. sumaco partenece a1 grupo P. tridentatus. Se …


A New Species Of Boettcheria From Guatemala (Diptera: Sarcophagidae), Thomas Pape, Gregory A. Dahlem Mar 1998

A New Species Of Boettcheria From Guatemala (Diptera: Sarcophagidae), Thomas Pape, Gregory A. Dahlem

Insecta Mundi

Boettcheria styx new species is described from Guatemala, and a key is provided to separate it from B. maerens (Townsend). A list is given of Central American species of Boettcheria with references to figures of their genitalia.


The Prairie Naturalist Volume 30, No.1 March 1998 Mar 1998

The Prairie Naturalist Volume 30, No.1 March 1998

The Prairie Naturalist

WATERFOWL FOODS OF CULTIVATED WILD RICE PADDIES IN NORTHWEST MINNESOTA ▪ J. T. Huseby, W. Po Cymbaluk, A. J. Melvie, W. D. Svedarsky, and R. D. Crawford

ICHTHYOFAUNA IN STREAMS OF THE MISSOURI RIVER DRAINAGE, WYOMING ▪ T. M. Patton, W. A. Hubert, and F. J. Rahel

Aphthona nigriscutis LARVAL DENSITIES IN CAMPBELL COUNTY, SOUTH DAKOTA ▪ M. A. Brinkman and S. A. Clay

DIETS OF BISON SOCIAL GROUPS ON TALLGRASS PRAIRIE IN OKLAHOMA ▪ B. R. Coppedge and J. H. Shaw

NUTRIENT AND ENERGETIC CHARACTERISTICS OF GRASSHOPPERS OF DIFFERENT LIFE STAGES ▪ R. J. Robel, C. A. Desjardins, and …


The Genus Erlandia Aurivillius, 1904 (Coleoptera: Cerambycidae) In Argentina, With The Description Of A New Species, Osvaldo R. Di Iorio Mar 1998

The Genus Erlandia Aurivillius, 1904 (Coleoptera: Cerambycidae) In Argentina, With The Description Of A New Species, Osvaldo R. Di Iorio

Insecta Mundi

The genus Erlandia (Cerambycinae: Erlandiini) was described by Aurivillius in 1904, containing a single species, Erlandia inopinata, distributed in Bolivia, Argentina, and Paraguay. A new species, E. megacephala, from Argentina is described, and illustrated here. A key and distribution map of both species are provided, with a generic diagnosis using characters of both species.


Notes On Polyphylla Harris With A Description Of A New Species. (Coleoptera: Scarabaeidae: Melolonthinae), Delbert A. La Rue Mar 1998

Notes On Polyphylla Harris With A Description Of A New Species. (Coleoptera: Scarabaeidae: Melolonthinae), Delbert A. La Rue

Insecta Mundi

Polyphylla aeolus La Rue, new species, is described from the Kelso Sand Dunes, Mojave Desert, San Bernardino County, California, U.S.A. Illustrations of dorsal habitus, significant morphological details, and adult genitalic forms are provided. A description of the type locality including geographical and ecological parameters is presented. Taxonomic problems within the genus and limitations of recently proposed methods of species identification are discussed. A modified key is provided to distinguish the new species.

The heretofore undescribed females of Polyphylla anteronivea Hardy, P. rnescalerensis Young, P. nubila Van Dyke, and P. pottsorum Hardy, are described. The larval host of P. erratica Hardy …


Cse Style Manual And Requirements For Publication In Insecta Mundi, R. H. Arnett Jr., R. E. Woodruff Mar 1998

Cse Style Manual And Requirements For Publication In Insecta Mundi, R. H. Arnett Jr., R. E. Woodruff

Insecta Mundi

The CSE quarterly journal, Insecta Mundi, is among the very few journals that have no page charges. Even so, the Center for Systematic Entomology is entirely financed through dues, subscriptions, and donations of cash, property, and time. We have found it necessary to make certain requirements for publication in the journal. (See also information on front inside cover of the journal.)


Book Review: Microscopic Anatomy Of Invertebrates, Harrison, Frederick W. (Editor) And Michael Locke., Ross H. Arnett Jr. Mar 1998

Book Review: Microscopic Anatomy Of Invertebrates, Harrison, Frederick W. (Editor) And Michael Locke., Ross H. Arnett Jr.

Insecta Mundi

Seldom does one have the opportunity (and honor) to review a work of the magnitude of this volume, 1 volume (in 3 parts) of a series of 15 volumes. Not being a specialist in microscopic anatomy, I cannot look for, or expect to find, errors. That was the job of the peer reviewers. Only extensive usage will determine whether or not they did their job.


Generic Definitions And Species Assignments In The Family Epipsocidae (Psocoptera), Edward L. Mockford Mar 1998

Generic Definitions And Species Assignments In The Family Epipsocidae (Psocoptera), Edward L. Mockford

Insecta Mundi

The family Epipsocidae is defined, with the addition of one character not previously used. The genus Dimidistriata Li and Mockford is removed from Epipsocidae and tentatively placed in the family Dolabellopsocidae. The genus Parepipsocus Badonnel remains unplaceable to family. Eleven genera are recognized within Epipsocidae. Bertkauia Kolbe, which had been synonymized with Epipsocus, is recognized as a valid genus. Definitions of genera based on the type species and seemingly close relatives result in 38 new combinations. Epipsocus Hagen, which previously held most of the species, now serves a dual function, with 15 species in the strict sense and 15 …


Review Of The Family Bochicidae, With New Species And Records (Arachnida: Pseudoscorpionida), William B. Muchmore Mar 1998

Review Of The Family Bochicidae, With New Species And Records (Arachnida: Pseudoscorpionida), William B. Muchmore

Insecta Mundi

A history of the family is presented. All of the genera and species previously assigned to the family are reviewed, and 4 new species are described: Leucohya parva from Venezuela and Guyana, Mexobisium venii from Belize and Guatemala, M. dominicanum from the Dominican Republic, and Paravachonium sprousei from Mexico. Two subfamilies are established: Bochicinae (including the genera Antillobisium, Bochica, Troglobochica, Troglohya, and Vachonium) and Leucohyinae (including Apohya, Leucohya, Mexobisiurn, and Paravachonium).


Needed: One-Page Articles Mar 1998

Needed: One-Page Articles

Insecta Mundi

We often have several pages to fill in each issue of Insecta Mundi. This is due to the practice we follow of starting each full length article on the right hand page. This provides a better appearing separate. As logic will predict, about half of the articles end on a right hand page, thus leaving the last left hand page blank. A blank page in a scientific journal is the same as throwing away money! So, we scramble around trying to find something to fill these pages, often with little success: better to leave it blank some say.


Nuevas Especies Del Género Amphelictogon (Diplopoda: Polydesmida: Chelodesmidae) En Cuba, Antonio R. Perez-Asso Mar 1998

Nuevas Especies Del Género Amphelictogon (Diplopoda: Polydesmida: Chelodesmidae) En Cuba, Antonio R. Perez-Asso

Insecta Mundi

Resumen: Se describen 5 especies nuevas del género Amphelictogon para la isla de Cuba, estas son: A. turquinensis, A. blairi, A. loomisi, A. estebani, y A. albertoi. Se presentan los principales caracteres utilizados para la diferenciación de las especies, asi como una clave taxonómica. Se realizan comentarios sobre la ecología y biogeografía de este grupo en la isla.

Abstract: Five new species of the genus Amphelictogon (A. turquinensis,A. blairi,A. loomisi,A. estebani, and A. albertoi) are described for Cuba. A taxonomic key and some comments on the ecology and biogeography of the genus in Cuba are given.


The Probe, Issue 186 - March 1998 Mar 1998

The Probe, Issue 186 - March 1998

The Probe: Newsletter of the National Animal Damage Control Association

CONTENTS:
NWCO Trade Assn. Proposed
NADCA Board Acts on NWCO Concerns
NWCO Concerns Heard
One View of W.C.T. Seminar
CALENDAR OF UPCOMING EVENTS
Back Issues of The Probe
Moving? Let Grant Know!
Postdoc / Postgraduate Position Available
Proceedings Available
State NWCO Organizations Grow
Video Review: Bird Barrier's Product Installation Video Tape Series.
More Reports From 4th Annual Conference of The Wildlife Society


Development Of A Blocking Enzyme-Linked Immunosorbent Assay For Detection Of Serum Antibodies To O157 Antigen Of Escherichia Coli, William Laegreid, Mark Hoffman, James Keen, Robert Elder, Jimmy Kwang Mar 1998

Development Of A Blocking Enzyme-Linked Immunosorbent Assay For Detection Of Serum Antibodies To O157 Antigen Of Escherichia Coli, William Laegreid, Mark Hoffman, James Keen, Robert Elder, Jimmy Kwang

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

The O157 antigen of Escherichia coli shares structural elements with lipopolysaccharide (LPS) antigens of other bacterial species, notably Brucella abortus and Yersinia enterocolitica O9, a fact that confounds the interpretation of assays for anti-O157 antibodies. To address this problem, a blocking enzyme-linked immunosorbent assay (bELISA) was designed with E. coli O157:H7 LPS as the antigen and a monoclonal antibody specific for E. coli O157, designated 13B3, as the competing antibody. The bELISA had equivalent sensitivity to, and significantly higher specificity than, the indirect ELISA (iELISA), detecting anti-O157 antibodies in sera from cattle experimentally inoculated with O157:H7. Only 13% of sera …


The National Wildlife Research Center: Providing Innovative Solutions To Human–Wildlife Conflicts Mar 1998

The National Wildlife Research Center: Providing Innovative Solutions To Human–Wildlife Conflicts

United States Department of Agriculture Wildlife Services: Staff Publications

Welcome to the National Wildlife Re search Center (NWRC), the primary research facility within the Wildlife Services (WS) program of the U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS). NWRC provides scientific information on wildlife, its habitat, and its relationship to agriculture and public safety. Here at the Center and at our nine field stations, specialists conduct scientific inquiries into the problems of wildlife damage and look for solutions to these problems.


The Greatest Memory Teacher Ever: Review Of Memory’S Ghost: The Nature Of Memory And The Strange Tale Of Mr. M., By Philip J. Hilts, Brian H. Bornstein Feb 1998

The Greatest Memory Teacher Ever: Review Of Memory’S Ghost: The Nature Of Memory And The Strange Tale Of Mr. M., By Philip J. Hilts, Brian H. Bornstein

Department of Psychology: Faculty Publications

Although psychologists and neurologists have been familiar with the case of H.M. for years, this small volume makes his story—and what it can teach us about the functioning of memory—accessible to a much wider audience. Hilts has done a good job of piecing together H.M.’s early life, in the absence of any living relatives and all but a few written records. He recreates the life of a very normal youth in the 1930s and 1940s; normal, that is, until H.M.’s first epileptic seizure. In 1954, after several other treatments for the epilepsy had failed, H.M. (at age 27) had a …


Developmental And Hormonal Regulation Of Transforming Growth Factor- Β1 (Tgfβ1), -2, And -3 Gene Expression In Isolated Prostatic Epithelial And Stromal Cells: Epidermal Growth Factor And Tgfβ Interactions, Naoki Itoh, Urvashi Patel, Andrea S. Cupp, Michael K. Skinner Feb 1998

Developmental And Hormonal Regulation Of Transforming Growth Factor- Β1 (Tgfβ1), -2, And -3 Gene Expression In Isolated Prostatic Epithelial And Stromal Cells: Epidermal Growth Factor And Tgfβ Interactions, Naoki Itoh, Urvashi Patel, Andrea S. Cupp, Michael K. Skinner

Department of Animal Science: Faculty Publications

Growth factors are postulated to mediate stromal-epithelial interactions in the prostate to maintain normal tissue physiology. Transforming growth factor-β (TGFβ) has been shown to influence the prostate and probably mediate stromal-epithelial interactions. TGFβ1 messenger RNA (mRNA) expression is stimulated after castration and can be suppressed by in vivo treatment with androgens. The hypothesis tested is that TGFβ is regulated not only by androgen, but also by a network of locally produced growth factors that influence prostatic growth and differentiation. Epithelial and stromal cells from 20-day-old rat ventral prostate were isolated and used to test this hypothesis. The expression of mRNA …


Natural History Of The Southern Short-Tailed Shrew, Blarina Carolinensis, Hugh H. Genoways, Jerry R. Choate Feb 1998

Natural History Of The Southern Short-Tailed Shrew, Blarina Carolinensis, Hugh H. Genoways, Jerry R. Choate

University of Nebraska State Museum: Mammalogy Papers

The southern short-tailed shrew, Blarina carolinensis, inhabits a broad range of ecological situations in the southeastern United States and, in many areas, is among the two or three most abundant species of small mammals. Nevertheless, its natural history is poorly known and much of what researchers assumed was fairly well understood about this species actually resulted from work on another species (Blarina brevicauda) and may not be correct in all instances. This problem resulted when modem systematic methods revealed that the wide-ranging and well-studied species known at that time as Blarina brevicauda actually consisted of three species …


The Probe, Issue 185 – February 1998 Feb 1998

The Probe, Issue 185 – February 1998

The Probe: Newsletter of the National Animal Damage Control Association

Animal Rights Groups Should Give Shelters Money, by Susan E. Paris
In Memoriam--Obituary: Norton R. Miner
From the President -- Robert H. Giles, Jr., President, NADCA
Job Announcements: 1. Coordinator, Isabela Project, Galapagos National Park Service; 2. Leader of Eradication Program Galapagos National Park Service
Brochure Provides Advice to Ranchers on Wolf Livestock Kills
Seattle Coyote Gets A Lift
Radio Says "No Thanks" to Fund
Oregon Mink Farms Attacked
Rabies Down, Tapeworms Up in European Foxes

More Reports From the 4th Annual Conference of The Wildlife Society:
Linking Spatial Heterogeneity and Social Behavior to Carnivore Population Dynamics: Development and Evaluation …


Nebline, February 1998 Feb 1998

Nebline, February 1998

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

4-H: What it's all about
Basil for everyone
1998 Perennial Plant
of the Year
Winter care of houseplants
Soap or oil—that is the question
Terrariums
Be A Better Gardener 4-H Youth Program
One starling's a darling, but a flock is not!
What's buzzing? Register for Beginners Beekeeping Workshop
today!
Grab it off the web
Pest management in and around your home: what's your strategy?
Backyard wildlife—tips for success
Volunteers are needed!
For the birds
Extension meetings scheduled
CRP Meeting and Burn School Planned
Farm Leases Seminar
Check out these winter workshops
Oats for pasture, hay and silage
Management key to …


Ard News February 1998 Feb 1998

Ard News February 1998

Agricultural Research Division: News and Annual Reports

CONTENTS:
COMMENTS FROM THE DEAN
ARD "Service Objectives"
Definition of Scientist Year (SY), Professional Year (PY), and Technical Year (TY)
Layman Awards
ARD Undergraduate Honors Student Research Program
Undergraduate Honors Research Program
Potential New USDA Competitive Grants Program
Grants and Contracts Received December and January, 1998
New or Revised Projects
Proposals Submitted for Federal Grants


Wpa News 55 (1998), World Pheasant Association Feb 1998

Wpa News 55 (1998), World Pheasant Association

Galliformes Specialist Group and Affiliated Societies: Newsletters

WPA News (February 1998), number 55

Published by the World Pheasant Association


Water Center, Volume 30, No. 1, February 1998 Feb 1998

Water Center, Volume 30, No. 1, February 1998

Water Current Newsletter

Resource Institute Working to Restore Native Prairies and Wetlands
From the Director: Water Conference, Seminar Series, USGS Grants
The Clean Water Act: A Twenty-Five Year Retrospective
CWA Has Positive Effects, But Future Cloudy
Still Time to Register for "Nebraska Water 2000"
Study Shows Risk of Animal Waste
Investigators Focus Attention on Community Drinking Water Disinfection
Water News Briefs
GW Foundation's Festival Expedition
Nominations for Haverstick Award
EPA Publications on Line
Source Water Assessment Program
E-Answers
Groundwater University and Groundwater Grad School


Identification Of Mealybug- (Homoptera: Pseudococcidae) Resistant Turf-Type Buffalograss Germplasm, Jennifer Johnson-Cicalese, Frederick P. Baxendale, Terrance P. Riordan, Tiffany Heng-Moss Feb 1998

Identification Of Mealybug- (Homoptera: Pseudococcidae) Resistant Turf-Type Buffalograss Germplasm, Jennifer Johnson-Cicalese, Frederick P. Baxendale, Terrance P. Riordan, Tiffany Heng-Moss

Department of Entomology: Faculty Publications

Two species of mealybugs, Tridiscus sporoboli (Cockerell) and Trionymus sp., have emerged as potentially serious pests of turf-type buffalograss, Buchloë dactyloides (Nuttall) Engelmann. Sixty-two buffalograss selections were screened for resistance to these mealybugs in 4 greenhouse trials. Using a 1-6 rating scale (1 = no signs of mealybugs, 6 = >75% of tillers infested), 'Prairie' and '609' showed high levels of resistance to mealybugs, whereas several experimental selections, including 90-157,84-512 and 84-412, exhibited moderate resistance. Most selections were moderately susceptible, and 85-97 was highly susceptible with almost every tiller infested and plants near death. In field tests, mealybug infestations were …


Prevalence Of Broad-Host-Range Lytic Bacteriophages Of Sphaerotilus Natans, Escherichia Coli, And Pseudomonas Aeruginosa, Ellen C. Jensen, Holly S. Schrader, Brenda Rieland, Thomas L. Thompson, Kit W. Lee, Kenneth W. Nickerson, Tyler A. Kokjohn Feb 1998

Prevalence Of Broad-Host-Range Lytic Bacteriophages Of Sphaerotilus Natans, Escherichia Coli, And Pseudomonas Aeruginosa, Ellen C. Jensen, Holly S. Schrader, Brenda Rieland, Thomas L. Thompson, Kit W. Lee, Kenneth W. Nickerson, Tyler A. Kokjohn

Papers in Microbiology

Two bacteriophage collections were examined with regard to their ability to form plaques on multiple bacterial host species. Nine of 10 phages studied were found to be broad-host-range bacteriophages. These phages fell into two groups. Group 1, the SN series, was isolated from sewage treatment plant samples with Sphaerotilus natans ATCC 13338 as a host. The DNAs of these bacteriophages contained modified bases and were insensitive to cleavage by type I and II restriction endonucleases. The efficiency of plating of these bacteriophages was changed only slightly on the alternate host. Group 2, the BHR series, was isolated by a two-host …