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Articles 1 - 17 of 17
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An Occurrence Of The Sawfish, Onchopristis Dunklei In The Upper Cretaceous Of Minnesota, Gerard Ramon Case
An Occurrence Of The Sawfish, Onchopristis Dunklei In The Upper Cretaceous Of Minnesota, Gerard Ramon Case
Journal of the Minnesota Academy of Science
ABSTRACT - Rostrol teeth of the middle Crefaceous sawfish 6nthopristis dunklei were recently recovered at a location in the Mesabi Iron Range near Keewatin, Minnesota. This represents the second reported occurrence of the species in the United States.
The Effect Of Light On The Growth Of Soybean Seedlings, Mary Abrahamsen, T. W. Sudia
The Effect Of Light On The Growth Of Soybean Seedlings, Mary Abrahamsen, T. W. Sudia
Journal of the Minnesota Academy of Science
ABSTRACT- During the course of 13 days of germination and growth, the dry weights of roots, hypocotyl, and epicotyl increased in soybeans grown both in the light and in the· dark. The roots of etiolated 13-day-old soybeans were only 50 per cent of the weights of roots from similar plants grown in the light. The epicotyls of etiolated plants were only 18 per cent of the dry weight of epicotyls of light-grown plants, but the hypocoyl weights of etiolated plants were greater than those grown in the light. Cotyledon dry weight of light-grown plants was reduced by 70 per cent …
A Philosopher Looks At Political Science, John J. Neumaier
A Philosopher Looks At Political Science, John J. Neumaier
Journal of the Minnesota Academy of Science
No abstract provided.
Distribution Of Foliar Applied P-32 From The Leaves Of Soybean At Various Ages, George E. Ahlgren, Theodore W. Sudia
Distribution Of Foliar Applied P-32 From The Leaves Of Soybean At Various Ages, George E. Ahlgren, Theodore W. Sudia
Journal of the Minnesota Academy of Science
Transport patterns of phosphorus-32 from the cotyledons, primary leaves and the first five trifoliate leaves of soybean were determined at various ages of these organs. The transport patterns studied indicate the same general pattern for each leaf. There is initially a bidirectional movement from the leaf that increases in its upward component as the leaf becomes older, followed by a sharp drop in the upward component and P'" transport becoming essentially unidirectional downward in the stem. At fruit development, phosphorus-32 transport becomes quite specific for fruit at the axil of a particular leaf. Contiguity to sites of high metabolic activity …
Cytoplasmic Male Sterility And Intergrafts Between Lycopersicon Esculentum And Solanum Pennellii Corr., W. R. Andersen
Cytoplasmic Male Sterility And Intergrafts Between Lycopersicon Esculentum And Solanum Pennellii Corr., W. R. Andersen
Journal of the Minnesota Academy of Science
Attempts to transmit cytoplasmic male sterility through intergrafts between Lycopersicon esculenfum and Solanum pennellii have been unsuccessful. This implies that in these materials, the factor conditioning cytoplasmic male sterility is noninfective. The results of this study and other similar studies by other workers suggest the possibility that grafting might be used as a tool in the classification of cytoplasmic factors affecting mole sterility in plants.
An Estimate Of Winter Utilization Of The Cedar Creek Natural History Area By The White-Tailed Deer, L. D. Frenzel Jr.
An Estimate Of Winter Utilization Of The Cedar Creek Natural History Area By The White-Tailed Deer, L. D. Frenzel Jr.
Journal of the Minnesota Academy of Science
Estimates of utilization of the Cedar Creek Natural History Area by the white-toiled deer (Odocoileus virginianus borealis) during the winters of 1963 and 1964 were mode using the deer-drive method. The 1964 estimate is considered the more realistic index of winter utilization by deer of the area because of increased efficiency of the drive, weather conditions favoring deer-drive technics, and agreement with results of pellet-count studies mode independently on the area.
Distribution In Minnesota Of Acer Saccharum, Tilia Americana And Betula Lutea, Edward Flaccus
Distribution In Minnesota Of Acer Saccharum, Tilia Americana And Betula Lutea, Edward Flaccus
Journal of the Minnesota Academy of Science
The distribution in Minnesota of three tree species (Acer saccharum, Betula lutea and Tilia americana) of the northern hardwood type have been plotted, using data from the Third Forest Inventory of the Lake States' Forest Experiment Station, herbaria records and records of occurrence from personal and other's field work. Maps are presented that give more detailed distributions than have heretofore been available. All three species show concentration in a belt along the North Shore of Lake Superior. Acer saccharum and Tilia Americana show the expected close correspondence of distribution in this belt and in a broad extension westward, almost to …
Early Pollen Forcing In A White X Black Spruce Hybrid And Its Parental Species, Lawson L. Winton
Early Pollen Forcing In A White X Black Spruce Hybrid And Its Parental Species, Lawson L. Winton
Journal of the Minnesota Academy of Science
Viable pollen was successfully forced from winter-collected cuttings of white and black spruce, as well as of a hybrid of them. The natural time difference in flowering was overcame, thus providing a tool for interbreeding these species. During forcing, and naturally on the trees, pollen always shed from white spruce first, then the hybrid and finally from black spruce. Using departures from long-range weather averages, a heat-requirement difference was postulated for each species to account for the time difference in their flowering.
Some Interpretations Of A Map On Minnesota Sawmilling, Lyda Belthuis
Some Interpretations Of A Map On Minnesota Sawmilling, Lyda Belthuis
Journal of the Minnesota Academy of Science
Sawmilling in Minnesota started about the time of settlement and, until 1870, mainly consisted of small mills located in the southern half of the state. Mills along the Mississippi River were mainly in urban centers while the remainder were scattered and associated with the clearing of the land and the meeting of the needs of local communities. After 1870, mills become larger. Many were constructed in northern Minnesota. All used forests in the northern port of the state and reduced them so greatly that, by 1920, the mills closed and were replaced by portable sawmills.
Northerly Movement Of Corn Borer Moths In Southern Minnesota, H. C. Chiang, Vern Sisson, M. A. Ewert
Northerly Movement Of Corn Borer Moths In Southern Minnesota, H. C. Chiang, Vern Sisson, M. A. Ewert
Journal of the Minnesota Academy of Science
Seventeen light traps were installed in 6 counties in southwest Minnesota in 1962 and 1963 and the nightly catches of moths of the European corn borer were recorded. The results show that moth catch was higher during nights with south winds and the nights immediately following such nights. This relation occurred over a large area and during the entire flight period. Moth popu1'otion in southern Minnesota was increased when south winds prevailed during the Right period. The trapping and recording were carried out by 15 FFA members, l 4-H member, and l adult farmer. The project demonstrates that these young …
Variations In Porphyrin Content In Root Nodules, Marie H. Berg
Variations In Porphyrin Content In Root Nodules, Marie H. Berg
Journal of the Minnesota Academy of Science
The root nodules of a series of legumes were investigated with and without inoculum in sterilized growing material as well as in open soil to find plants that synthesize extractable amounts of porphyrins. These experiments were a preliminary study toward the investigation of the influence of heavy metal salts on the increased production of porphyrins.
Identification And Distribution Of Minnesota Leucorrhinia Species (Odonata, Libellulidae), Charles L. Hamrun, Robert Evans Carlson, Arthur W. Glass
Identification And Distribution Of Minnesota Leucorrhinia Species (Odonata, Libellulidae), Charles L. Hamrun, Robert Evans Carlson, Arthur W. Glass
Journal of the Minnesota Academy of Science
Minnesota Leucorrhinia species are contrasted with one another through the use of male and female characters . Included in the key lo species are two species (frigida and glacialis) not previously reported from Minnesota. All North American species are discussed.
Experimental Studies On Habitat Preference And Thermoregulation Of Bufo Americanus, B. Hemiophrys And B. Cognatus, John R. Tester, A. Parker, Donald B. Siniff
Experimental Studies On Habitat Preference And Thermoregulation Of Bufo Americanus, B. Hemiophrys And B. Cognatus, John R. Tester, A. Parker, Donald B. Siniff
Journal of the Minnesota Academy of Science
This paper reports on responses lo habitat and thermoregulotion exhibited by three species of toads, Bufo omericanus, B. hemiophrys and 8. cognalus, under artificial conditions. The response of the toads to sparse, medium, and dense vegetative cover was investigated by establishing artificial cover types in a sheet-metal enclosure. Each of the three species spent more time in the dense cover than i11 sparse or medium cover. A second experiment to determine if the toads would be attracted by odor to samples of mud, water, and vegetation from their respective ranges suggested that the toads moved randomly to the habitat samples. …
A Review Of Characters Used In The Identification Of North Central States' Sitona Germar (Coleoptera, Curculionidae)., Valerie J. Fridrich
A Review Of Characters Used In The Identification Of North Central States' Sitona Germar (Coleoptera, Curculionidae)., Valerie J. Fridrich
Journal of the Minnesota Academy of Science
Lack of good literature concerning taxonomy of the genus Sitona has prompted this study. Specific characters, such as, color, prothorax shape, frontal groove, punctures, genitalia, setae, eyes, length, elytral shape, and scales are discussed. A key for the five species of the North Centro I Stales is presented, including notes on each species.
The Wild Celery Of Christmas Lake, Hibbert Hill
The Wild Celery Of Christmas Lake, Hibbert Hill
Journal of the Minnesota Academy of Science
The growth and reproduction of Vallisneria as seen and photographed below water in Christmas Lake, Hennepin County, Minnesota, is described. The functions of the water surface film, of wave energy, and of the coiled stem of the pistillate flower, in fertilization is discussed. It is found that many of the plants grow in such depths that fertilization is impossible.
A Comparative Study Of Wood Pulp From The Trunk, Limbs, And Roots Of The Quaking Aspen (Populus Tremuloides), John Vernanth, Raynell Walker, Ann Johnson
A Comparative Study Of Wood Pulp From The Trunk, Limbs, And Roots Of The Quaking Aspen (Populus Tremuloides), John Vernanth, Raynell Walker, Ann Johnson
Journal of the Minnesota Academy of Science
A three part study was conducted on a single quaking aspen tree (Populus tremuloides): ( l) the strength and other physical properties of fiberboard made from the trunk, roots, and limbs using the cold soda pulping process, (2) the strength properties of paper made from the trunk, root, and limb sections using the Kraft pulping process, and (3) a chemical analysis of the trunk, roots, and limbs. Results of these studies indicate there are significant differences in many of the properties of the three parts of the tree, and that parts of the tree other than the trunk possess useful …
The Abnormal Coxofemoral Articulation In The German Shepherd Dog, Griselda Hanlon
The Abnormal Coxofemoral Articulation In The German Shepherd Dog, Griselda Hanlon
Journal of the Minnesota Academy of Science
A common abnormality among dogs of the coxofemoral articulation, known as developmental hip dysplasia, is discussed with special reference to its occurrence in the German Shepherd breed. Some observations made from serial radiographic studies of the maturation of normal and abnormal coxofemorol articulation of 200 experimental German Shepherd dogs are presented, and a method of measuring the ilio-acetabular angle is described. Further evaluation will be made of the angle as an early predictor in the course of developmental hip dysplasia.