Comparisons of the North Polar Cap of Mars and the Earth's Northern Hemisphere snow cover

The boundaries of the polar caps of Mars have been measured on more than 3000 photographs since 1905 from the plate collection at the Lowell Observatory. For the Earth the polar caps have been accurately mapped only since the mid 1960's when satellites were first available to synoptically view the polar regions. The polar caps of both planets wax and wane in response to changes in the seasons, and interannual differences in polar cap behavior on Mars as well as Earth are intimately linked to global energy balance. In this study data on the year to year variations in the extent of the polar caps of Mars and Earth were assembled and analyzed together with data on annual variations in solar activity to determine if associations exist between these data. It was found that virtually no correlation exists between measurements of Mars north polar cap and solar variability. An inverse relationship was found between variations in the size of the north polar caps of Mars and Earth, although only 6 years of concurrent data were available for comparison

The Context of Teacher Professionalism: A Case Study of Teacher Perceptions of Professionalism at the University Laboratory School.

Ph.D. Thesis. University of Hawaiʻi at Mānoa 2017

The Impact of Pesticides on the White-Faced Ibis

The white-faced ibis (Plegadis chihi) which nested in northern Utah was assessed as a species with a relatively low reproductive potential. Ibises normally laid either three or four eggs in a clutch and did not renest persistently, nor with good success, if initial nesting attempts failed. Evidence indicated that the birds did not breed until at least 2 years old. Competition for food, exposure to severe weather, and predation were conspicuous sources of nestling mortality. White-faced ibises usually fed in irrigated agricultural areas, where they came into direct contact with insecticides, such as DDT which was used routinely in northern Utah until 1971. The most frequent food items of the ibises were insect larvae and earthworms, hence the birds were subject to food-chain concentrations of pesticide residues. White-faced ibises commonly laid eggs with cracked or broken shells from 1968 through 1971, but the incidence of aberrant eggs decreased after 1971. By 1974, no significant difference was found between the current mean eggshell thickness and the thickness of eggshells collected before 1940 and preserved in museums. Also, in 1974, less than 1 percent of nests surveyed contained cracked eggs. White-faced ibises in Utah again laid thin-shelled eggs in 1975 and 1976, Cracked eggs were found in about 30 percent of nests examined during both of these years, and the means of eggshell thickness were significantly less than in 1974. A high incidence of cracked eggs was associated with less than 10 percent thinning of eggshells. Eggshell thickness of white-faced ibis eggs collected in 1975 was significantly related, linearly and negatively, to the logarithms of DDE residues of the eggs. The comparison of this relationship to those of other species indicated that the white-faced ibis is especially sensitive to eggshell thinning. DDE residues were found in samples of blood serum, breast muscle. and subcutaneous fat of white-faced ibises collected in 1974 and 1975. The logarithm of DOE in blood serum was positively correlated with 1n DDE in fat and with ln DDE in muscle. DDE levels in blood serum were related to lipid mobilization and varied by season and between sexes

Alien Registration- Capen, Edna V. (Rumford, Oxford County)

https://digitalmaine.com/alien_docs/13468/thumbnail.jp

Malignant pheochromocytoma in a pig

Abstract. Endocrine tumors are rarely observed in pigs, and pheochromocytomas have been only punctually described. The current report describes a white and firm, 15-cm in diameter, neoplastic mass located in the adrenal gland with metastasis to regional lymph nodes in a 2.5-year-old sow. The masses had marked desmoplasia that supported a population of polygonal-tospindle– shaped neoplastic cells arranged into cords and packets within a delicate fibrovascular stroma. Immunohistochemical staining of the tumor was positive for chromogranin and negative for neurofilament protein in adrenal and lymph node masses, which was characteristic of a malignant pheochromocytoma

Classical Inspiration and Modern Expression: Greek Art Turned Fauve, Constructivist, Dada, and Pop

Senior colloquium written by a student in the UNT Honors College discussing Greek sculpture and architecture as filtered through the Fauve, Constructivist, Dada, and Pop artistic movements. The author takes examples of Grecian sculpture, recreates them in each of the other styles, and discusses the results

Double-Crested Cormorant and Ring-Billed Gull Damage Management on Lake Champlain: Are Basin-Wide Objectives Achievable?

Ring-billed gulls (Larus delewarensis) and double-crested cormorants (Phalacrocorx auritus) have nested on Lake Champlain since 1949 and 1982, respectively. Recent increases in cormorant nesting populations and pioneering activities of both species to previously uncolonized islands have resulted in impacts related to accumulation of bird guano and interspecific competition with less common species. Of primary concern are: decreases in wildlife and plant diversity on islands; reduced aesthetics and property values of island associated with the loss of trees; and predation or competition for nesting space with other species such as the state-endangered common tern (Sterna hirundo). In addition, public concerns have been raised over potential impacts to fish species by cormorants, as well as urban-suburban gull activity impacting human health and safety and property. Nine stakeholder meetings have been held since 1990, to consider prospective management strategies for gulls and cormorants on Lake Champlain, Vermont. Since 1994, limited site-specific control efforts have been conducted by USDA-APHIS-ADC (ADC) at the request of the Vermont Fish and Wildlife Department (VFWD) and private landowners who recently experienced damage from these species. A technique for the removal of cormorant nests in trees has been developed and tested by ADC using portable pumps to deliver pressurized water to remove the nests. This technique has proven successful in tree nests up to approximately 15 m. Also, an alternative method is being tested to selectively remove nesting cormorants from a great blue heron (Ardea herodius) rookery. Currently, a draft environmental assessment is being prepared cooperatively by VFWD and ADC that explores alternatives for future management over 5 years beginning in 1998. Extensive public involvement using a variety of approaches will occur during the summer of 1997. VFWD, in cooperation with ADC, will continue to approach damage management on Lake Champlain for these species on a site-specific basis while working toward a more comprehensive interstate and international agreement on goals for basin-wide population and ecosystem management

Ultimobranchial thyroid neoplasms in bulls. A syndrome resembling medullary thyroid carcinoma in man

A syndrome of ultimobranchial thyroid neoplasms which shares many similarities with medullary thyroid carcinoma in man occurs frequently in populations of adult bulls. The results of this investigation demonstrated that ultimobranchial neoplasms were composed of poorly differentiated parafollicular (C—) cells with extensive aggregations of microfilaments, clusters of ribosomes, and prominent Golgi apparatuses. Secretion granules often were interspersed between microfilaments. Other more columnar neoplastic cells assumed a ductal pattern. The prominent stroma contained amyloid fibrils and collagen fibers. By comparison, cells comprising medullary thyroid carcinoma were more differentiated parafollicular cells with well developed cytoplasmic organelles and numerous membrane‐limited secretion granules. Calcitonin activity was demonstrated by biologic assay in both ultimobranchial adenomas (466 ± 84 MRC mU/g) and carcinomas (409 ± 93 MRC mU/g) but serum calcium and phosphorus levels were within normal limits. Plasma calcitonin‐like activity was increased significantly 1 hour after calcium infusion but rapidly returned to baseline values. Parathyroid glands from bulls with ultimobranchial neoplasms had ultrastructural evidence of atrophy and secretory inactivity. Numerous lipofuscin, granules and cytosegresomes but few secretory granules were present in chief cells. Aggregations of amyloid fibrils surrounded chief cells and capillaries. Multiple endocrine tumors (pheochromocytomas and pituitary acidophil adenomas) and vertebral osteosclerosis with ankylosing spondylosis frequently were detected in bulls coincidentally with ultimobranchial thyroid neoplasms. Copyright © 1973 American Cancer Societ