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Articles 53431 - 53460 of 53612
Full-Text Articles in Life Sciences
Physiology Of Ethylene Production, Use, And Reactions In Plants, R. C. Nelson
Physiology Of Ethylene Production, Use, And Reactions In Plants, R. C. Nelson
Journal of the Minnesota Academy of Science
No abstract provided.
Hiemenz's Study Of The Heron Lake Franklin's Gull Colony, George W. Friedrich
Hiemenz's Study Of The Heron Lake Franklin's Gull Colony, George W. Friedrich
Journal of the Minnesota Academy of Science
No abstract provided.
List Of Twenty-Two Species Of Monogenetic Trematodes From The South Pacific, F. G. Meserve
List Of Twenty-Two Species Of Monogenetic Trematodes From The South Pacific, F. G. Meserve
Journal of the Minnesota Academy of Science
No abstract provided.
A Preliminary Report On A Study Of College Science Courses Considered Valuable By High School Science Teachers, G. M. Wissink
A Preliminary Report On A Study Of College Science Courses Considered Valuable By High School Science Teachers, G. M. Wissink
Journal of the Minnesota Academy of Science
No abstract provided.
Notes On The Sphingidae (Lepidoptera) Of Arkansas, Avery Freeman
Notes On The Sphingidae (Lepidoptera) Of Arkansas, Avery Freeman
Field and Laboratory
Between the years 1926 and 1937, the writer made a general study of the Lepidoptera of Arkansas, paying special attention to the Sphingidae. During the period thirty-two species in twenty-one genera were collected, and their relations studied.
Established And Supposed Examples Of Meteoritic Craters And Structures, John D. Boon, Claude C. Albritton Jr.
Established And Supposed Examples Of Meteoritic Craters And Structures, John D. Boon, Claude C. Albritton Jr.
Field and Laboratory
Meteor Crater of Arizona, three-quarters of a mile across and six hundred feet deep, with its walls of tilted and faulted strata and its encircling high rim of pulverized and brecciated rock, is a spectacle for the student of land forms, of geologic structures, and of katamorphic processes. Standing on its rim, one is impressed by the fact that craterforming meteorites are extraterrestrial agents that are truly catastrophic in their geological effects. However, the relative importance of giant meteorites among the agents that shape the landscape and deform or break rocks depends upon the distribution of meteorite scars in space …
The Impact Of Large Meteorites, John D. Boon, Claude C. Albritton Jr.
The Impact Of Large Meteorites, John D. Boon, Claude C. Albritton Jr.
Field and Laboratory
The speed of meteorites at the time they reach the surface of the earth depends largely upon the resistance they have encountered in passing through the atmosphere and upon the hour of day that they fall.
Individualism And Collectivism In Nature, Wm. Carpenter Maccarty
Individualism And Collectivism In Nature, Wm. Carpenter Maccarty
Journal of the Minnesota Academy of Science
No abstract provided.
The Search For Natural History Areas In Minnesota, A. N. Wilcox, W. J. Breckenridge, R. L. Donovan, T. B. Magath, H. E. Stork, Gustav Swanson
The Search For Natural History Areas In Minnesota, A. N. Wilcox, W. J. Breckenridge, R. L. Donovan, T. B. Magath, H. E. Stork, Gustav Swanson
Journal of the Minnesota Academy of Science
No abstract provided.
Effect Of Colchicine On Chromosome Number And Cell Size In Some Horticultural Plants, Catharine Lunt Becker
Effect Of Colchicine On Chromosome Number And Cell Size In Some Horticultural Plants, Catharine Lunt Becker
Journal of the Minnesota Academy of Science
No abstract provided.
Some Higher Fungi In The Vicinity Of Winona, Sister M. Sylvia
Some Higher Fungi In The Vicinity Of Winona, Sister M. Sylvia
Journal of the Minnesota Academy of Science
No abstract provided.
A Survey Of Father John Katzner's Horticultural Work, Adelard Thuente
A Survey Of Father John Katzner's Horticultural Work, Adelard Thuente
Journal of the Minnesota Academy of Science
No abstract provided.
Studies Of Mexican And Central American Plants - Iv, C. L. Lundell
Studies Of Mexican And Central American Plants - Iv, C. L. Lundell
Field and Laboratory
During July, 1937, the writer and Mrs. Lundell botanized along the Laredo-Mexico City highway as far south as Santa Ana, Hidalgo. A week was spent at Tamazunchale, San Luis Potosi, where the largest series of plants was obtained.
The Magdalena Valley Of Colombia: A Geographical Reconnaissance, J. C. Kearby, R. D. Everett
The Magdalena Valley Of Colombia: A Geographical Reconnaissance, J. C. Kearby, R. D. Everett
Field and Laboratory
The Magdalena River, which rises on the slopes of Papas Peak, at the junction of the Cordillera Central and the Cordillera Oriental of the northern Andes, flows northward through the heart of Colombia to the Caribbean Sea, to form the country's leading highway. From its source, the river winds its way through 1,000 miles of jungle to Barranquilla, the principal Colombian port on the Caribbean. The Valley extends some seventy-five kilometers laterally, terminating in the foothills of the Central and Oriental Cordilleras.
Note On The Origin Of Tiffin Hole, Iowa, John D. Boon, Claude C. Albritton Jr.
Note On The Origin Of Tiffin Hole, Iowa, John D. Boon, Claude C. Albritton Jr.
Field and Laboratory
In describing the crater-like depression a quarter of a mile south of Tiffin, Iowa, Professor C. C. Wylie emphasized the need for criteria to distinguish depressions caused by meteoritic explosions from those formed by other agencies. He was able to show that this elliptical depression 100 ft. long, 75 ft. across, and about eight feet deep, is not a sink hole, buffalo wallow, artificial pond, or initial depression in glacial drift.… rofessor Wylie considered the possibility of a meteoritic origin, but was unable to discover convincing field evidence to support this hypothesis. The writers suggest that Tiffin Hole is a …
Diatoms As A Source For California Petroleum: A Summary Review, Fred B. Phleger Jr., Claude C. Albritton Jr.
Diatoms As A Source For California Petroleum: A Summary Review, Fred B. Phleger Jr., Claude C. Albritton Jr.
Field and Laboratory
The diatom has been variously regarded as the major source, as an accessory source, and as a doubtful source for California petroleum. The two main lines of evidence cited by upholders of the first view are: (1) the intimate association of diatomaceous deposits with the majority of oil producing areas in the state, and (2) the observed ability of living diatoms to manufacture oil, which under favorable conditions could be stored in contemporaneous sediments. Opposed to this view are the facts that (1) some petroliferous areas in the state produce from horizons high above the postulated diatomaceous source beds, (2) …
Color Phases In Helicina Orbiculata Tropica 'Jan' Pfr., E. P. Cheatum, Betty Watt Brooks
Color Phases In Helicina Orbiculata Tropica 'Jan' Pfr., E. P. Cheatum, Betty Watt Brooks
Field and Laboratory
An interesting shell-color phase occurs in Helicina orbiculata tropica ’Jan.’ Pfr., a small land snail found in abund ance in northeastern, southern, and central Texas. Pilsbry and Ferris have noted color variations in this species, stating that "some colonies are all white; others are mingled with red or blue shells".
Dinosaur Tracks At The Fourth Crossing Of The Paluxy River Near Glen Rose, Texas, Ellis W. Shuler
Dinosaur Tracks At The Fourth Crossing Of The Paluxy River Near Glen Rose, Texas, Ellis W. Shuler
Field and Laboratory
Erosion has laid bare at least eight localities in Somervell County, Texas, showing dinosaur tracks in the Glen Rose limestone. It is with keen regret that this article records the disappearance of one of the most notable of these exhibits, the well known track locality at the fourth crossing of the Paluxy River, about four miles west of the town of Glen Rose. Stream erosion, which brought to view there a superb collection of tracks, continued its work too well and wiped out the exhibit as an eraser wipes out a schoolboy's blackboard drawing.
Notes On The Acrididae (Orthoptera) Of Iowa, Herbert Knutson
Notes On The Acrididae (Orthoptera) Of Iowa, Herbert Knutson
Field and Laboratory
Considerable taxonomic work has been published on the grasshoppers of many of the midwestern states, such as that of Hebard on species of South Dakota ('25), Kansas ('31), Minnesota ('32), and Illinois ('34). Also, some work of economic character has been done in each of the midwestern states.
Age Of The Malone Fauna, Claude C. Albritton Jr.
Age Of The Malone Fauna, Claude C. Albritton Jr.
Field and Laboratory
The geological age of the Malone fauna, described in 1905 by Cragin, has been a subject of considerable uncertainty…. The writer spent the summers of 1934 and 1935 in the Malone area, mapping it with plane table on a scale of one inch to a thousand feet. Extensive collections of fossils gathered at both old and new localities were referred to twenty-five carefully measured stratigraphical sections.
Blue Sun: A Colloidal Explanation, Phil Wagley
Blue Sun: A Colloidal Explanation, Phil Wagley
Field and Laboratory
During a severe duststorm at Dallas, Texas, on March 17, 1935, the disk of the sun appeared deep blue in color. The dust of the storm was composed largely of small grains of quartz, floating in the atmosphere at a great height, perhaps 12,000 feet or more. Reports from the Dallas Airport Station indicated that the duststorms that came during the spring of 1935 often reached this height, and at times the ceiling was 13,500 feet. In western Texas and Oklahoma, these duststorms frequently produced high potential electrical charges in the atmosphere, causing sparks to be drawn from metal parts …
Pectinatella Magnifica Leidy An Occasional River-Pest In Iowa, S. W. Geiser
Pectinatella Magnifica Leidy An Occasional River-Pest In Iowa, S. W. Geiser
Field and Laboratory
The common fresh-water Bryozoan, Pectinatella magnifica Leidy, with which this paper deals, is widely distributed in the United States, Northern Germany, and Czechoslovakia.
Meteorite Scars In Ancient Rocks, John D. Boon, Claude C. Albritton Jr.
Meteorite Scars In Ancient Rocks, John D. Boon, Claude C. Albritton Jr.
Field and Laboratory
In a previous paper the writers suggested that some explosion structures currently attributed to volcanism may actually record impacts of giant meteorites which fell during the geological past. It is the purpose of this article to show how meteorite craters and their underlying structures might be preserved, and to evaluate the meteoritic hypothesis as an explanation for three structures which tentatively have been assigned to other origins.
Daily Light Ration And Gonadal Activity In The English Sparrow, Passer Domesticus, A. R. Ringoen, A. Kirschbaum
Daily Light Ration And Gonadal Activity In The English Sparrow, Passer Domesticus, A. R. Ringoen, A. Kirschbaum
Journal of the Minnesota Academy of Science
No abstract provided.
How Two Captive Young Beavers Constructed A Food Pile, Thos. S. Roberts
How Two Captive Young Beavers Constructed A Food Pile, Thos. S. Roberts
Journal of the Minnesota Academy of Science
No abstract provided.
The Comparative Permeability Of Woods To Liquids, Harvey D. Erickson
The Comparative Permeability Of Woods To Liquids, Harvey D. Erickson
Journal of the Minnesota Academy of Science
No abstract provided.
Studies Of Prenatal Development In Farm Animals, L. M. Winters
Studies Of Prenatal Development In Farm Animals, L. M. Winters
Journal of the Minnesota Academy of Science
The central objective of these studies has been to gather as accurate data as possible regarding normal prenatal development in farm animals. Once this is established as a base we or other workers will be in a position to study the specific effects of unfavorable environments, such as deficiency rations, excess fat, etc. Our work has progressed far enough so that we are now incorporating some of the latter in our studies.
The Fate Of The Indigenous, Arthur N. Wilcox
The Fate Of The Indigenous, Arthur N. Wilcox
Journal of the Minnesota Academy of Science
No abstract provided.
The Birds Of Minnesota Point, Olga Lakela
The Birds Of Minnesota Point, Olga Lakela
Journal of the Minnesota Academy of Science
No abstract provided.