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- Trees--Growth (2)
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- Aitkin (Minn.) (1)
Articles 31 - 60 of 103
Full-Text Articles in Life Sciences
The Rate Of Disappearance Of Some Induced Chromosome Aberrations In The Germinating Seeds Of Jack Pine, Richard J. Mcmahan
The Rate Of Disappearance Of Some Induced Chromosome Aberrations In The Germinating Seeds Of Jack Pine, Richard J. Mcmahan
Journal of the Minnesota Academy of Science
No abstract provided.
Factors Affecting Infection And Oospore Formation Of Aphanomyces Euteiches Drech. In Excised Root Tip Of Pisum Sativum, Yong Sup Cho, T. H. King
Factors Affecting Infection And Oospore Formation Of Aphanomyces Euteiches Drech. In Excised Root Tip Of Pisum Sativum, Yong Sup Cho, T. H. King
Journal of the Minnesota Academy of Science
No abstract provided.
Occurrence And Severity Of The Viruses Of Strawberry In Minnesota, T. H. King, Stephen C.Y. Liu, R. L. Skiles
Occurrence And Severity Of The Viruses Of Strawberry In Minnesota, T. H. King, Stephen C.Y. Liu, R. L. Skiles
Journal of the Minnesota Academy of Science
Approximately 900 plants of commercially grown strawberries of 45 varieties and experimental seedling selections were collected from various parts of the state of Minnesota and indexed for the presence of viruses. Their presence in these plants was demonstrated by the appearance of symptoms in the indicator plant, Fragaria vesca L., after they were inarch-grafted. 93 % of the plants indexed were virus-infected. Based on symptoms, the viruses have been classified into 14 symptomtypes. It was found that mottle and mild yellow-edge were the two dominant viruses, whereas crinkle and vein chlorosis were of rare occurrence. There was no indication that …
The Effect Of O-Phenylphenol On The Growth Of Some Fungi Occurring In Wood, William Merrill, D. W. French
The Effect Of O-Phenylphenol On The Growth Of Some Fungi Occurring In Wood, William Merrill, D. W. French
Journal of the Minnesota Academy of Science
It is often difficult or impossible to obtain cultures of wood rotting fungi from pieces of decayed wood placed on agar media, because other fungi present in the wood grow out rapidly and hide or suppress the fungus or fungi responsible for the decay. Trichoderma viride Pers. occurs very commonly in decayed wood, grows rapidly on agar media suitable for the isolation of wood-rotting fungi, and makes the isolation of wood decay fungi difficult. Russell (2) reported that Ophenylphenol added to the culture medium at the rate of 0.06 grams per liter would inhibit the growth of Trichoderma but permit …
Species Distribution In A Prairie In Relation To Water-Holding Capacity, Max L. Partch
Species Distribution In A Prairie In Relation To Water-Holding Capacity, Max L. Partch
Journal of the Minnesota Academy of Science
Plants are seldom distributed uniformly, if an area of much size is considered, since even the smallest environmental differences may affect the success of some species. This study is an attempt to correlate the nonrandom distribution of plants in one prairie area with one measurable environmental factor, namely waterholding capacity. The well known phenomenon of zonation concerns a marked change in environment and therefore in species, and, as seems quite obvious, therefore also a change in plant communities. What might seem more obvious than real, however, is the boundary between any two of these so-called communities. It is possible that …
Relative Susceptibility To Fungus Infection Of Liberty Barley Kernels With Albino And Normal Lemmas, Richard W. Lutey
Relative Susceptibility To Fungus Infection Of Liberty Barley Kernels With Albino And Normal Lemmas, Richard W. Lutey
Journal of the Minnesota Academy of Science
In recent years the demand by the malting industry for plump, non-discolored barley has increased, as is evident from the premium market prices paid for such grain ( 4) . There is evidence from laboratory research ( 6), and from practical malting and brewing experience that bright barley is most desirable and suitable for malting purposes ( 5). It has been suggested that kernel discoloration is related to the number and kinds of micro-organisms in and on the kernels (2, 3, 4) and that barley varieties differ in their susceptibility to invasion by these micro-organisms (3). At present, Liberty barley …
Arisaema Triphyllum, Jack-In-The-Pulpit, In Minnesota, Especially At The Cedar Creek Natural History Area, Sadao Sakamoto
Arisaema Triphyllum, Jack-In-The-Pulpit, In Minnesota, Especially At The Cedar Creek Natural History Area, Sadao Sakamoto
Journal of the Minnesota Academy of Science
Arisaema triphyllum (L.) Schott is a member of the Araceae, or Arum family and is distributed widely in temperate regions of North America, from Nova Scotia to Florida, Ontario, Minnesota, Kansas. and Louisiana. Various aspects of this species have been investigated by many botanists since the last decade of the 19th century.
The Influence Of Soil On Germination Of Fungus Spores, Roy D. Wilcoxson
The Influence Of Soil On Germination Of Fungus Spores, Roy D. Wilcoxson
Journal of the Minnesota Academy of Science
Soil prevents spores of many fungi from germinating, according to reports from different parts of the world. Thus Welsh soils were reported to be fungistatic to several fungi (Dobbs, 1953). Jackson (1958) made a similar report about Nigerian soils. In Minnesota Fusarium oxysporium f. lini (Bolley) Sny. and Han. persists in soil devoid of host debris but Helminthosporium sativum P.K.B. does not (Anwar, 1949). A more thorough study of the influence of Minnesota soils on germination of fungus spores would provide additional information on ecology of fungi and might suggest control measures for certain pathogens. Such a study may be …
Staining Of Barley Kernels By Bacteria, Richard W. Lutey
Staining Of Barley Kernels By Bacteria, Richard W. Lutey
Journal of the Minnesota Academy of Science
The demand for beer light in color has placed emphasis on the need to regulate malting as to produce, naturally and consistently, malts that are light in color (Bawden and Artis 1954), and malt having a clean pleasing aroma (Hopkins and Krause 1937). Even when bright barley, relatively free of field fungi, is malted, the finished product tends to be darker in color than the starting materials; in some cases to the extent that bleaching with sulfur dioxide gas is required (Hopkins and Krause 1937; Oesting et al. 1949). The cause of this discoloration is not known, but bacteria might …
The Excised Embryo Culture Method For Controlled Seedling Growth Of The Sweet Fern, Comptonia Peregrina, Of The Family Myricaceae, Helen E. Heino
The Excised Embryo Culture Method For Controlled Seedling Growth Of The Sweet Fern, Comptonia Peregrina, Of The Family Myricaceae, Helen E. Heino
Journal of the Minnesota Academy of Science
Sweet fern, Comptonia peregrina (L.) Coult. according to Fernald (1950), in older literature often referred to as Myrica asplenifolia L. or Comptonia asplenifolia (L.) Ait., is the only species in this genus. It is a low branching, stoloniferous shrub up to a meter and a half tall, with linear-lanceolate leaves that are regularly and deeply pinnatifid giving a fern-like appearance, though it is not at all related to the ferns. It has a characteristic sweet resinous scent. The plants are monoecious or dioecious, flowers are in catkins; staminate catkins are slender and cylindrical; pistillate catkins become a spherical bur-like fruit. …
A Study Of Annual Accumulation Of Organic Matter In A Five-Year Old Larix Laricina, Vincent A. Heig
A Study Of Annual Accumulation Of Organic Matter In A Five-Year Old Larix Laricina, Vincent A. Heig
Journal of the Minnesota Academy of Science
The purpose of this study is to evaluate a method of calculating the annual accumulation of xylem in shoot system of a tree. Larix laricina was ideally suited for this study because of several structural traits. Its terminal bud scale scars or girdles remain visible up to approximately eight years after their formation and make it possible to differentiate between each year's addition in stem length. It has one dominant leader bud which forms a straight main axis facilitating the differentiation between axial and secondary branch growth. Larix laricina also has growth rings which can be easily identified when cross …
Relations Between Certain Vegetational Characters And Ground Water Level In A Mixed Hardwood Community In East-Central Minnesota, J. P. Lindmeier, J. R. Tester, D. W. Warner
Relations Between Certain Vegetational Characters And Ground Water Level In A Mixed Hardwood Community In East-Central Minnesota, J. P. Lindmeier, J. R. Tester, D. W. Warner
Journal of the Minnesota Academy of Science
This report describes the vegetation of a mixed hardwood community in terms of species composition, frequency, areal cover and height classes in relation to ground water level. An attempt is made to show how known changes in ground water level during the past 25 years have brought about changes in the vegetation.
Pollination Studies With Native Minnesota Pyrola And Moneses Species, Lawrence C.W. Jensen
Pollination Studies With Native Minnesota Pyrola And Moneses Species, Lawrence C.W. Jensen
Journal of the Minnesota Academy of Science
The closely related ericaceous ericaceous genera, Pyrola L. and Monese Salisb. ex. Gray, are common throughout the world in coniferous woods of north temperate areas. Characteristically they are small herbaceous plants with basal evergreen leaves and decorative inflorescences of green, white or pink flowers appearing in the early summer. In Minnesota there are five species of Pyrola-P. asarifolia Michx., P. elliptica Nutt., P. rotundifolia L., P. secunda L., and P. virens Schweigger. There is also the one species of Moneses, M. uniffora (L.) Gray. All these occur together in abundant quantities and bloom at approximately the same time. Consequently they …
Fruit And Seed Project Of The Cedar Creek Natural History Area, Frieda L. Wertman, D. B. Lawrence
Fruit And Seed Project Of The Cedar Creek Natural History Area, Frieda L. Wertman, D. B. Lawrence
Journal of the Minnesota Academy of Science
The program was initiated with the support of the Graduate School of the University of Minnesota in May, 1960 through the interest of Dean T. C. Blegen. There are four major objectives: (1) To establish a collection of ripe fruits and seeds to provide a permanent reference file of the entire seed plant flora of the area newly mapped through a grant from the National Science Foundation. (2) To prepare duplicate sets of standard herbarium mounts of material with ripe disseminules, one set for the laboratory at Cedar Creek, the other for the Herbarium of the Department of Botany of …
Light Reflectivity As An Index Of Chlorophyll Content And Production Potential Of Various Kinds Of Vegetation, J. R. Bray, J. E. Sanger
Light Reflectivity As An Index Of Chlorophyll Content And Production Potential Of Various Kinds Of Vegetation, J. R. Bray, J. E. Sanger
Journal of the Minnesota Academy of Science
As a part of the study, "Energy relations of terrestrial ecosystems," being carried on at Cedar Creek Natural History Area, and generously supported by the Hill Family Foundation, the University of Minnesota, and the National Research Council of Canada, an attempt was made in the summer of 1960 to discover the relationship between the chlorophyll content of various plant communities and the visible albedo, that is the ratio of the amount of light reflected from the landscape to the total amount falling upon it. ·
Growth Of Cankers Caused By Hypoxylon Pruinatum On Aspen And Sporulation Of The Fungus, Francis A. Wood, D. W. French
Growth Of Cankers Caused By Hypoxylon Pruinatum On Aspen And Sporulation Of The Fungus, Francis A. Wood, D. W. French
Journal of the Minnesota Academy of Science
No abstract provided.
An Analysis Of Selected Red Pine Stands In Itasca State Park, Minnesota, Roy K. Blowers
An Analysis Of Selected Red Pine Stands In Itasca State Park, Minnesota, Roy K. Blowers
Journal of the Minnesota Academy of Science
No abstract provided.
The Role Of Agropyron Repens In The Seedling Blight Epidemiology Of Alfalfa And Cereals, Thor Kommedahl, J. H. Ohman
The Role Of Agropyron Repens In The Seedling Blight Epidemiology Of Alfalfa And Cereals, Thor Kommedahl, J. H. Ohman
Journal of the Minnesota Academy of Science
No abstract provided.
The In Vitro Growth Of Roots Of Various Crucifer Species, Richard D. Durbin
The In Vitro Growth Of Roots Of Various Crucifer Species, Richard D. Durbin
Journal of the Minnesota Academy of Science
No abstract provided.
Ecosystem Studies At Cedar Creek Natural History Area, Ii, D. B. Lawrence, J. D. Ovington, J. R. Bray
Ecosystem Studies At Cedar Creek Natural History Area, Ii, D. B. Lawrence, J. D. Ovington, J. R. Bray
Journal of the Minnesota Academy of Science
No abstract provided.
The In Vitro Culture Of Embryos, Ovules And Ovaries Of Pisum Sativum, Wolfgang Koch, A. J. Linck
The In Vitro Culture Of Embryos, Ovules And Ovaries Of Pisum Sativum, Wolfgang Koch, A. J. Linck
Journal of the Minnesota Academy of Science
No abstract provided.
A Comparison Of Forest Ecological Sampling Techniques Using A Known Population, Theodore W. Sudia
A Comparison Of Forest Ecological Sampling Techniques Using A Known Population, Theodore W. Sudia
Journal of the Minnesota Academy of Science
No abstract provided.
Structural Organization Of Forest Ecosystems, Egolfs V. Bakuzis
Structural Organization Of Forest Ecosystems, Egolfs V. Bakuzis
Journal of the Minnesota Academy of Science
No abstract provided.
A Study To Determine Optimum Plot Size For Progeny Testing Red Pine, George M. Blake
A Study To Determine Optimum Plot Size For Progeny Testing Red Pine, George M. Blake
Journal of the Minnesota Academy of Science
No abstract provided.
Studies Of The Kinetochore In Eleocharis Macrostachya Britt., James V. Bernardini
Studies Of The Kinetochore In Eleocharis Macrostachya Britt., James V. Bernardini
Journal of the Minnesota Academy of Science
No abstract provided.
The Ecological Effect Of A Preceding Crop On Smartweed In Flax, Thor Kommedahl, M. E. Tumbleson
The Ecological Effect Of A Preceding Crop On Smartweed In Flax, Thor Kommedahl, M. E. Tumbleson
Journal of the Minnesota Academy of Science
No abstract provided.
The Control Pollination Of Slash Pine, James T. Greene
The Control Pollination Of Slash Pine, James T. Greene
Journal of the Minnesota Academy of Science
No abstract provided.
Histogenesis Of Tilia Americana Embryos, William J. Peters
Histogenesis Of Tilia Americana Embryos, William J. Peters
Journal of the Minnesota Academy of Science
No abstract provided.
The Effect Of High Temperature On The Amino Acids In Peas, Roger G. Lambert
The Effect Of High Temperature On The Amino Acids In Peas, Roger G. Lambert
Journal of the Minnesota Academy of Science
No abstract provided.
A Pollen Diagram From The Site Of Glacial Lake Aitkin, John H. Mcandrews
A Pollen Diagram From The Site Of Glacial Lake Aitkin, John H. Mcandrews
Journal of the Minnesota Academy of Science
No abstract provided.