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Articles 32161 - 32190 of 32961

Full-Text Articles in Life Sciences

A Preliminary Study Of A Physical Basis Of Bird Navigation, Henry L. Yeagley Dec 1947

A Preliminary Study Of A Physical Basis Of Bird Navigation, Henry L. Yeagley

Papers in Ornithology

The bird navigation theory as presented implies an organ or organs in the bird's physiology which are sensitive to the effect of its motion through the vertical component of the earth's magnetic field and to the effort exerted to overcome the coriolis force, due to the earth's rotation. Both these influences involve a set of lines which together form a navigational gridwork. By correlating its instantaneous land speed with the two above effects, a bird can fly to its home which is a unique point in this gridwork, or to related companion points existing in the gridwork at positions other …


Killing, Dressing And Drawing Poultry, I. L. Williams Nov 1947

Killing, Dressing And Drawing Poultry, I. L. Williams

Nebraska Agricultural Experiment Station: Historical Circulars

The object of this circular is to acquaint poultry producers and poultry dressing plant operators with the more desirable methods for killing, dressing and drawing poultry. Dressed poultry is a highly perishable food, and any practice that will tend to retain the original high quality during the processing operation should be applied.


Turkey Steaks, I. L. Williams, H. L. Wiegers Oct 1947

Turkey Steaks, I. L. Williams, H. L. Wiegers

Nebraska Agricultural Experiment Station: Historical Circulars

The purpose of this circular is to acquaint growers, processors, retailers and consumers with a method of preparing large turkeys in such a manner as to promote the highest degree of consumer acceptance.


Bakererpes Fragilis N. G., N. Sp., A Cestode From The Nighthawk (Cestoda: Dilepididae), Robert L. Rausch Oct 1947

Bakererpes Fragilis N. G., N. Sp., A Cestode From The Nighthawk (Cestoda: Dilepididae), Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

The examination of an Eastern Nighthawk (Chordeiles m. minor (Forster)), collected September 25, 1945, at Marion, Ohio, revealed numerous, very small cestodes free in the lumen of the small intestine. About fifty specimens were found, but, because of the delicate strobila of this species, few were entire.
Although these cestodes were very thin and translucent, the preparation of well-stained whole mounts presented unusual difficulty. Best results were obtained with a mixture of Ehrlich's and Delafield's haematoxylin stains. Frontal and transverse serial sections, cut at 10 and 15 μm, were made.
This cestode clearly belongs in the sub-family Dilepidinae, but, …


Effects Of Mowing Frequency On The Yield And Protein Content Of Several Grasses Grown In Pure Stands, L. C. Newell, F. D. Keim Sep 1947

Effects Of Mowing Frequency On The Yield And Protein Content Of Several Grasses Grown In Pure Stands, L. C. Newell, F. D. Keim

Nebraska Agricultural Experiment Station: Historical Research Bulletins

This paper presents results of a five-year experiment conducted at the Agricultural Experiment Station, Lincoln, Nebraska, on the adaptation, yield, and quality of several grasses subjected to different frequencies of harvest as a means of determining their forage value.


The Digenetic Trematodes Of Marine Fishes Of Tortugas, Florida, Harold W. Manter Sep 1947

The Digenetic Trematodes Of Marine Fishes Of Tortugas, Florida, Harold W. Manter

Harold W. Manter Laboratory of Parasitology: Library Materials

189 species of digenetic trematodes are reported from teleost fishes of the region of Tortugas, Florida. Among these are recognized: 44 new species, 9 new genera, 44 new combinations, 14 new synonyms, and 51 new host records. Several genera and species are considered synonyms of those previously named.

Of 237 species (approximately 2,039 specimens) of teleost fishes examined, 182 species or 76.8% were parasitized by adult, digenetic trematodes. Most of the host species harbored from one to three species of trematodes; 79 (or 43.4% of the 182) had a single species of trematode. Two fishes, however, were each susceptible to …


Observations On Some Helminths Parasitic In Ohio Turtles, Robert L. Rausch Sep 1947

Observations On Some Helminths Parasitic In Ohio Turtles, Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

The examination of a number of turtles, collected in Ohio, has disclosed at least thirty-three species of parasitic helminths. Little information is available on the parasites of turtles in the Central States, and it is the purpose of this paper to present data resulting from examinations made on 128 turtles, of seven species.


Mattamuskeet: A National Wildlife Refuge, Rachel Carson Jul 1947

Mattamuskeet: A National Wildlife Refuge, Rachel Carson

United States Fish and Wildlife Service: Publications

Mattamuskeet, Pea Island, and Swanquarter-- two on the mainland and one on the outermost barrier beach--are three National Wildlife Refuges in North Carolina that provide winter food and shelter for more than 100,000 waterfowl. Ducks, geese, and swans that in summer scatter across the northern rim of the world from Greenland to Alaska come down the sky lanes in the fall and in these refuges find the conditions they need to survive the hard months of winter.

At Mattamuskeet you can see one of the largest assemblages of Canada geese on the Atlantic seaboard and more of that giant white …


The Utilization Of Food Elements By Growing Poults, C. W. Ackerson, F. E. Mussehl Jul 1947

The Utilization Of Food Elements By Growing Poults, C. W. Ackerson, F. E. Mussehl

Nebraska Agricultural Experiment Station: Historical Research Bulletins

1. Day-old poults were found to contain an average of 1.28 g nitrogen, 0.18 g calcium and 0.15 g phosphorus. 2. Day-old poults were fed equal amounts of a good growing ration for 52 days. Analysis of these poults showed retention of 42.6 per cent of the nitrogen, 23.4 per cent of the calcium and 31.3 per cent of the phosphorus contained in the ration. 3. Retentions of nitrogen, calcium and phosphorus were on the same order as those obtained in like feeding trials with chicks.


Riboflavin Production By Molds, George L. Peltier, Raymond Borchers Jul 1947

Riboflavin Production By Molds, George L. Peltier, Raymond Borchers

Papers in Microbiology

Very little information is at hand regarding the ability of molds to synthesize riboflavin. Few citations pertaining directly to riboflavin production by true molds are available.2 Pontovich (1943) found as much as 2 mg riboflavin per g of Aspergillus flavus mycelium. Tanner et at. (1945) determined the quantity of riboflavin in the submerged fermentation media of Penicillium chrysogenum. The highest value found was 1. 36 mg per ml. The primary purpose of this study was to screen several hundred isolates, recently obtained from soil, crop residues, and composts, for their ability to produce riboflavin on a wheat bran substrate.


Nebraska Bird Review (July-December 1947) 15(2), Whole Issue Jul 1947

Nebraska Bird Review (July-December 1947) 15(2), Whole Issue

Nebraska Bird Review

Contents

Bird Departure Dates .........Wilson Tout 1

Recent Changes in Nomenclature and Subspecific Status of Nebraska Birds .........F.W. Haecker 5

"Drumming" in the Chimney Swift .........W.E. Eigsti 9

Banding Mourning Doves in Eastern Nebraska.........Wilhelmina and Leroy Gulotta 12

Hawk Populations in Nebraska......... John H. Wampole 20

Winter Birds of the Fontenelle Forest......... Charles A. Stewart 24

Notes on the Nesting of the Acadian and Alder Flycatchers......... Frank H. Shoemaker ......... 31

N.O.U. Cooperative Bird Migration and Occurrence List for First Half of 1947......... 36

General Notes......... 40

Nebraska Bird Club News......... Adrian C. Fox......... 55

Announcements......... 60

News and Comment......... …


Index To Volume Xv, Number 2, Florence J. Patton Jul 1947

Index To Volume Xv, Number 2, Florence J. Patton

Nebraska Bird Review

Accipitriidae, 25

Adams County, 45

Anatidae, 25

Announcements, 60

Bird Departure Dates, 1

Blackbird, Brewers, 45, 47; Red-winged, Eastern, 50; Yellow-headed, 39

Bluebird, Eastern, 29, 38, 50; Mountain, 52

Bobolink, 46, 47

. . .

Willet, Western, 48

Woodcock, 53

Woodpecker, Hairy, 27; Northern Downy, 27, 50; Red-headed, 27; Western Red-bellied, 26, 39

Wren, Carolina, 42, 48; House, 39, 50; Prairie Marsh, 43; Rock, 46, 52

Yellow-throat, Northern, 50


Ec1551 Insect Control In The Production Of Alfalfa Seed, Ephriam Hixson Jun 1947

Ec1551 Insect Control In The Production Of Alfalfa Seed, Ephriam Hixson

University of Nebraska-Lincoln Extension: Historical Materials

Extension circular 1551 discusses insect control in the production of alfalfa seed.


Chincoteague: A National Wildlife Refuge, Rachel Carson Jun 1947

Chincoteague: A National Wildlife Refuge, Rachel Carson

United States Fish and Wildlife Service: Publications

The national wildlife refuge at Chincoteague, Virginia, is one of the newest in a chain of sanctuaries placed along the flight lanes of the waterfowl. Coming down from the north the principal links of the chain are Parker River, Montezuma, Susquehanna, Brigantine, and Bombay Hook. Then from Chincoteague the links run south, through Back Bay and Pea Island, Mattamuskeet and Cape Romain. Chincoteague, like other waterfowl refuges, is needed because birds migrate, and because in so doing they expose themselves to great dangers.

The migration of birds is one of the ancient spectacles of earth, and one of the most …


Parker River: A National Wildlife Refuge, Rachel Carson Jun 1947

Parker River: A National Wildlife Refuge, Rachel Carson

United States Fish and Wildlife Service: Publications

The Parker River National Wildlife Refuge is New England's most important contribution to the national effort to save the waterfowl of North America. Many million Americans have a direct stake in the success of this effort: the 2,000,00o waterfowl hunters, the millions who find recreation and esthetic pleasure in observing and photographing the birds, and all those, whom there is no way of counting, who understand the value of preserving wildlife as part of America's natural heritage.

During the several generations in which the United States has been converted from a land preeminently wild and unsettled into an industrial and …


Developing Rapid-Feathering Chickens, I. L. Williams, H. L. Wiegers Jun 1947

Developing Rapid-Feathering Chickens, I. L. Williams, H. L. Wiegers

Nebraska Agricultural Experiment Station: Historical Circulars

The object of this circular is to acquaint the poultry producer, hatchery operator, or any other person endeavoring to develop improved strains of chickens with a satisfactory method for eliminating slow-feathering individuals from his flock.


Index To Volume Xv, Number 1, A. C. Fox, M. L. Hanson Jun 1947

Index To Volume Xv, Number 1, A. C. Fox, M. L. Hanson

Nebraska Bird Review

Adams County, 19

Agate, Nebraska, 24

Ager, James: The Snowy Owl in Kearney County, 18

Allen, Robert P., 22

Anderson, Dana: Waxwings at Columbus, Platte County, 16

Baldpate, 33

Benckeser, Harold R.: Notes on Wintering Birds in Keith County, 14; Occurrence of Gyrfalcon in Keith County, 18

. . .

Witschy, Mrs. Rey: Field Day Notes from Scottsbluff, Scotts Bluff County, 20

Woodpecker: Downy, 19, 20, 21, 33; Eastern Hairy, 14; Hairy, 19, 20, 21; Northern Downy, 14; Red-bellied, 19, 21; Red-headed, 20, 21, 33

Wren: Common Rock, 33; House, 21, 23, 24; Western House, 20, 33

Yellow-legs, 20; Greater, …


Ec1507 Revised 1947 New Insecticides For The Control Of Grasshoppers, Ephriam Hixson May 1947

Ec1507 Revised 1947 New Insecticides For The Control Of Grasshoppers, Ephriam Hixson

University of Nebraska-Lincoln Extension: Historical Materials

Extension circular 1507 Revised 1947 discusses new insecticides for the control of grasshoppers.


Block And Bridle Annual 1947 Apr 1947

Block And Bridle Annual 1947

Block and Bridle Annual (1933–2021)

After being inactive for three years because of the War, the Nebraska chapter of Block and Bridle was reactivated on April 22, 1946.


Ec1549 External Parasites Of Chickens And Ddt, Ephriam Hixson, Martin H. Muma Apr 1947

Ec1549 External Parasites Of Chickens And Ddt, Ephriam Hixson, Martin H. Muma

University of Nebraska-Lincoln Extension: Historical Materials

Extension circular 1549 discusses external parasites of chickens and DDT.


Suggestions For The Handling Of Certain Mammals, Robert L. Rausch Apr 1947

Suggestions For The Handling Of Certain Mammals, Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

For experimental work, it is often desirable to handle the smaller wild mammals more freely than usual methods allow. Howell (Journal of Mammalogy (1937) 18(4): 513) suggests the feeding of pentobarbital sodium in milk or other food. While this may be satisfactory for animals accustomed to captivity, it can hardly be used for those newly captured.


Pullorum Disease In The Coot, Robert L. Rausch Apr 1947

Pullorum Disease In The Coot, Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Among specimens collected on March 8, 1945, at Buckeye Lake, Ohio, were a number of coots (Fulica americana). When the latter were examined for parasitic infection, it was noticed that the ovary of one specimen was deformed, and much enlarged when compared with those of other birds of this species collected on the same day. No other lesions were detected macroscopically, and the bird appeared to be in normal physical condition. The ovaries resembled those found in chickens affected with pullorum disease, and a pure culture of Salmonella pullorum was recovered.


A Method Of Measuring Vigor Of Range Grasses, J. E. Weaver Apr 1947

A Method Of Measuring Vigor Of Range Grasses, J. E. Weaver

Department of Agronomy and Horticulture: Faculty Publications

After several years of intensive study of midwestern prairies, their degeneration under grazing was given careful consideration (Weaver and Fitzpatrick, '32, '34; Weaver and Hansen, '41). It was ascertained that the intelligent use or careless abuse of these grasslands had resulted in pastures and ranges which could logically be grouped into four classes. These were excellent, good, medium, and poor. The first consisted almost entirely of climax grasses and an abundance of nutritious forbs which, as is almost universally found, were of the highest grazing value (Bews, '29: 298). In good pastures many of these persisted, but there was a …


The Vitamin A And Carotene Content Of Nebraska Butter, I. L. Hathaway, H. P. Davis Feb 1947

The Vitamin A And Carotene Content Of Nebraska Butter, I. L. Hathaway, H. P. Davis

Nebraska Agricultural Experiment Station: Historical Research Bulletins

The vitamin-A, carotene, fat and moisture concentrations of Nebraska creamery butter were determined at monthly intervals for 25 months. Samples were obtained from 14 creameries located throughout the state. Their vitamin-A and carotene determinations were made with the aid of a spectrophotometer, and their fat and moisture analyses were determined by the A.O.A.C. methods. From a comparison of these data with the results of investigations in other states it was concluded that Nebraska butter was at least equal in vitamin-A value to average United States butter.


Riboflavin Production By Molds, George L. Peltier, Raymond Borchers Jan 1947

Riboflavin Production By Molds, George L. Peltier, Raymond Borchers

Department of Biochemistry: Faculty Publications

Very little information is at hand regarding the ability of molds to synthesize riboflavin. Few citations pertaining directly to riboflavin production by true

molds are available. Pontovich (1943) found as much as 2 mg riboflavin per g

of Aspergillus flavus mycelium. Tanner et at. (1945) determined the quantity of

riboflavin in the submerged fermentation media of Penicillium chrysogenum.

The highest value found was 1. 36 mg per ml. The primary purpose of this study

was to screen several hundred isolates, recently obtained from soil, crop residues,

and composts, for their ability to produce riboflavin on a wheat bran substrate.


Nebraska Bird Review (January-June 1947) 15(1), Whole Issue Jan 1947

Nebraska Bird Review (January-June 1947) 15(1), Whole Issue

Nebraska Bird Review

Contents

Wintering Waterfowl 1946-1947. By John H. Wampole ... 1

Branta canadensis in Nebraska. By R. Allyn Moser ... 5

Notes on the Nesting of the Blue Grosbeak. By Mrs. Archie Middleton ... 8

Notes on Birds in Nebraska National Forest, Bessey Division. By Carl E. Smith ... 11

General Notes ... 14

Minutes of the Forty-sixth Annual Meeting of the Nebraska Ornithologists' Union ... 26

Report of the Forty-third Annual Field Day of the Nebraska Ornithologists' Union ... 32

News and Comment ... 34

Reviews ... 36


The Goss Lemming Mouse, Synaptomys Cooperi Gossii (Goues), In Nebraska, Edson Fichter, Merle F. Hansen Jan 1947

The Goss Lemming Mouse, Synaptomys Cooperi Gossii (Goues), In Nebraska, Edson Fichter, Merle F. Hansen

Bulletin of the University of Nebraska State Museum (1924–2023)

In the course of studies on the cestode parasites of microtine rodents by one of the authors (Hansen), specimens of mice were sent to the United State National Museum where they were identified by Dr. David H. Johnson. Two of these microtines proved to be Synaptomys cooperi gossii (Coues). These specimens of Synaptomys (U.S.N.M. Nos. 282343 and 282344), collected at Lincoln, Lancaster County, Nebraska, on September 16, 1946 (male) and November 20, 1946 (female), respectively, are the first ones to be identified from Nebraska.


Farm Fishponds, Verne E. Davison Jan 1947

Farm Fishponds, Verne E. Davison

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

An important part of soil and moisture conservation is making the best use of every acre on the farm. Where a suitable site for a farm pond exists, no better use can be made of such land than to develop it for the production of fish for the farm family. The recreation the pond affords adds much to the pleasure of rural life.

Thousands of farms have good pond sites. Properly developed and managed ponds may provide both food and pleasure to more than a million farm people.

This bulletin tells how to have good ponds. It explains how to …


Andrya Sciuri N. Sp., A Cestode From The Northern Flying Squirrel, Robert L. Rausch Jan 1947

Andrya Sciuri N. Sp., A Cestode From The Northern Flying Squirrel, Robert L. Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Among helminths taken from four northern flying squirrels (Glaucomys sabrinus macrotis Mearns) were two cestodes belonging to the genus Andrya. These represent an undescribed species. The infected flying squirrels were collected in or near tamarack bogs during February, 1947, near Millston, Jackson County, Wisconsin.


A Redescription Of Taenia Taxidiensis Skinker, 1935, Robert Rausch Jan 1947

A Redescription Of Taenia Taxidiensis Skinker, 1935, Robert Rausch

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Since the original description of Taenia taxidiensis Skinker, 1935,2 was based on an incomplete and apparently immature cestode, a redescription seems desirable.

The following description is based on 28 cestodes, taken from three infected badgers, Taxidea taxus (Schreber), all collected in southern Wisconsin. Of these, only one strobila had gravid segments, the others being immature. Most of the data given below are based on the single mature specimen, with additional measurements, where Possible, from the immature worms. No sections were made of these specimens, and the measurements given were taken fl·om stained wholemounts.