21 resultados para Stream-gradiente index
em Brock University, Canada
Resumo:
Interactions between freshwater algae and bacteria were examined in a natural stream habitat and a laboratory model. Field observations provided circumstantial evidence, in statistical correlation for syntrophy between the microbial populations. This relation is probably subject to control by the temperature and pH of the aquatic environment. Several species of a pond community were isolated in axenic culture and tests were performed to determine the nature of mixed species interactions. Isolation procedures and field studies indicated that selected strains of Chlorella and Azotobacter were closely associated in their natural habitat. With the suspected controlling parameters, pH and temperature, held constant, mixed cultures of algae and bacteria were compared to axenic cultures of the same organisms, and a mutual stimulation of growth was observed. A mixed pure culture apparatus was designed in this laboratory to study the algal-bacterial interaction and to test the hypothesis that such an interaction may take place through a diffusable substance or through certain medium-borne conditions, Azotobacter was found to take up a Chlorella-produced exudate, to stimulate protein synthesis, to enhance chlorophyll production and to cause a numerical increase in the interacting Chlorella population. It is not clear whether control is at the environmental, cellular or genetic level in these mixed population interactions. Experimental observations in the model system, taken with field correlations allow one to state that there may be a direct relationship governing the population fluctuations of these two organisms in their natural stream surroundings.
Resumo:
Mathematical predictions of flow conditions along a steep gradient rock bedded stream are examined. Stream gage discharge data and Manning's Equation are used to calculate alternative velocities, and subsequently Froude Numbers, assuming varying values of velocity coefficient, full depth or depth adjusted for vertical flow separation. Comparison of the results with photos show that Froude Numbers calculated from velocities derived from Manning's Equation, assuming a velocity coefficient of 1.30 and full depth, most accurately predict flow conditions, when supercritical flow is defined as Froude Number values above 0.84. Calculated Froude Number values between 0.8 and 1.1 correlate well with observed transitional flow, defined as the first appearance of small diagonal waves. Transitions from subcritical through transitional to clearly supercritical flow are predictable. Froude Number contour maps reveal a sinuous rise and fall of values reminiscent of pool riffle energy distribution.
Resumo:
The aim of this study was to describe the nonlinear association between body mass index (BMI) and breast cancer outcomes and to determine whether BMI improves prediction of outcomes. A cohort of906 breast cancer patients diagnosed at Henry Ford Health System, Detroit (1985-1990) were studied. The median follow-up was 10 years. Multivariate logistic regression was used to model breast cancer recurrence/progression and breast cancer-specific death. Restricted cubic splines were used to model nonlinear effects. Receiver operator characteristic areas under the curves (ROC AUC) were used to evaluate prediction. BMI was nonlinearly associated with recurrence/progression and death (p= 0.0230 and 0.0101). Probability of outcomes increased with increase or decrease ofBMI away from 25. BMI splines were suggestive of improved prediction of death. The ROC AUCs for nested models with and without BMI were 0.8424 and 0.8331 (p= 0.08). I f causally associated, modifying patients BMI towards 25 may improve outcomes.
Resumo:
Index of names for the Survey of Lands for the Welland Canal Company. The index includes names for people whos lands were surveyed on the line of the canal. The index also includes a very basic geographic location of the lands in reference to the canal (for example, east, west, resevoir. No page numbers are listed.
Resumo:
Index of names for the Welland Canal Company's Survey of Land book, 1826. Includes persons name, land cultivated, uncultivated, total land and remarks. The remarks noted include; who surveyed the lands, the dates of the survey, former property names, additional property features etc.The page is titled: Statement of Lands Surveyed and appropriated to the use of the Welland Canal Company.
Resumo:
This is an index of all the names contained within the Survey of Lands. The names are listed in alphabetical order and are paired with page numbers where more information can be found on the individuals listed. This page lists names beginning with "A" through to an including "N".
Resumo:
This is an index of all the names contained within the Survey of Lands. The names are listed in alphabetical order and are paired with page numbers where more information can be found on the individuals listed. This page lists names beginning with "O" through to an including "Z".
Resumo:
Issues for the March 1813 Weekly Register newspaper (Baltimore, Maryland) are divided and includes the following War of 1812 related stories: March 6th, pages 1-16: Editor's proclamation on reporting on the war (p.1); Declaration of British Parliament - 9 January 1813 (pp.1-6); President's message to Senate and House of Representatives - February 24 (p.8); Events of the War including reports from Ogdensburgh,Battle of Frenchtown with Brigadier General James Winchester, Colonel Henry Proctor, and Round Head; (pp.9-13); naval events (pp.13-15); President Madison's speech - March 4 (pp.15-16). March 13th, pages 17-40 March 20th, pages 41-56 March 27th, pages 57-72 PLEASE CLICK ON THE WEEKLY PERIODICALS ON THE RIGHT OF THE SCREEN (PDF FILES)TO DOWNLOAD FILES. Look for other issues of the Weekly Register within this website. The Weekly Register, also known as Niles Weekly Register, was a weekly periodical edited by Hezekiah Niles (1777-1839) and published in Baltimore Maryland. Volumes of interest were published between 1811 (Vol. 1, No. 1, September 7, 1811) to 1814 (Vol. 5, No. 26, February 26, 1814). These volumes focus primarily on 19th century politics and government in the United States of America. Niles edited and published the Weekly Register until 1836, making it one of the most widely-circulated magazines in the United States. The popularity also made Niles into one of the most influential journalists of his day. Devoted primarily to politics, Niles' Weekly Register is considered an important source for the history of the period. The Register also recorded current economics, technology, science, medicine, geography, archaeology, the weather, and stories of human interest. Call Number: SPCL PER JK 1 N52
Resumo:
Issues for the September 1811 Weekly Register newspaper (Baltimore, Maryland) are divided as follows: September 7th, pages 1-16 September 14th, pages 17-32 September 21st, pages 33-48 September 28th, pages 49-72 PLEASE CLICK ON THE WEEKLY PERIODICALS ON THE RIGHT OF THE SCREEN (PDF FILES)TO DOWNLOAD FILES. Look for other issues of the Weekly Register within this website. The Weekly Register, also known as Niles Weekly Register, was a weekly periodical edited by Hezekiah Niles (1777-1839) and published in Baltimore Maryland. Volumes of interest were published between 1811 (Vol. 1, No. 1, September 7, 1811) to 1814 (Vol. 5, No. 26, February 26, 1814). These volumes focus primarily on 19th century politics and government in the United States of America. Niles edited and published the Weekly Register until 1836, making it one of the most widely-circulated magazines in the United States. The popularity also made Niles into one of the most influential journalists of his day. Devoted primarily to politics, Niles' Weekly Register is considered an important source for the history of the period. The Register also recorded current economics, technology, science, medicine, geography, archaeology, the weather, and stories of human interest. Call Number: SPCL PER JK 1 N52
Resumo:
Specific pages related to the War of 1812 include: Pages 655, 656, 657: Battles on the Niagara Frontier, with the death of Major General Sir Isaac Brock at the Battle of Queenston Heights on October 13, 1812. Page 670: Oct 13 - Obituary for Major General Sir Isaac Brock. Click on the pdf links to the right to view the monthly issue. The Gentleman's Magazine and Historical Chronicle was a monthly periodical published in England during the years of 1736-1833. The volumes of interest from 1812-1815 were written and compiled by Sylvanus Urban, Gentleman. These volumes were printed in London by Nichols, Son and Bentley at Cicero's Head, Red Lion Passage and Fleet Street. The magazine contains accounts of important historical events, abstracts of foreign occurrences, letters from noted figures, articles on geography, biographical entries for prominent people, poems, statistics, obituaries, reviews of books and more.
Resumo:
The Gentleman's Magazine and Historical Chronicle was a monthly periodical published in England during the years of 1736-1833. The volumes of interest from 1812-1815 were written and compiled by Sylvanus Urban, Gentleman. These volumes were Printed in London by Nichols, Son and Bentley at Cicero's Head, Red Lion Passage and Fleet Street. Click on the pdf links to the right to view the monthly issue. This bound volume has been divided by months. The page divisions are as listed. Index pages 673-700 January pages 1-96 February pages 97-192 March pages 193-296 April pages 297-400 Prefix to May pages 401-408 * May pages 401-504 June pages 505-600 Supplement pages 601-672 *Pages 401-408 are duplicated. Please check both the Prefix to May and May for these pages listed in the Index.
Resumo:
The Gentleman's Magazine and Historical Chronicle was a monthly periodical published in England during the years of 1736-1833. The volumes of interest from 1812-1815 were written and compiled by Sylvanus Urban, Gentleman. These volumes were Printed in London by Nichols, Son and Bentley at Cicero's Head, Red Lion Passage and Fleet Street. Click on the pdf links to the right to view the monthly issue. This bound volume has been divided by months. The page divisions are as listed. Index pages 705-728 July pages 1-96 August pages 97-200 September pages 201-304 October pages 305-408 November pages 409-512 December pages 529-632 Supplement pages 633-704
Resumo:
The Gentleman's Magazine and Historical Chronicle was a monthly periodical published in England during the years of 1736-1833. The volumes of interest from 1812-1815 were written and compiled by Sylvanus Urban, Gentleman. These volumes were Printed in London by Nichols, Son and Bentley at Cicero's Head, Red Lion Passage and Fleet Street. Click on the pdf links to the right to view the monthly issue. This bound volume has been divided by months. The page divisions are as listed. Index pages 705-732 January pages 1-104 February pages 105-208 March pages 209-312 April pages 313-424 May pages 425-528 June pages 529-632 Supplement pages 633-704