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Physical Sciences and Mathematics Commons™

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1986

Dartmouth Scholarship

Articles 1 - 7 of 7

Full-Text Articles in Physical Sciences and Mathematics

The Homeo Domain Of A Murine Protein Binds 5' To Its Own Homeo Box., Abraham Fainsod, Leonard D. Bogarad, Tarmo Ruusala, Martin Lubin Dec 1986

The Homeo Domain Of A Murine Protein Binds 5' To Its Own Homeo Box., Abraham Fainsod, Leonard D. Bogarad, Tarmo Ruusala, Martin Lubin

Dartmouth Scholarship

Nuclear protein extracts from day 12.5 mouse embryos were used to study protein binding to DNA sequences 5' of the Hox 1.5 homeo box. Embryos of this developmental stage are known to express this gene. DNA binding protein blotting and retardation gel techniques show that murine embryonic nuclear proteins specifically bind a 753-base pair (bp) DNA fragment from the region upstream of the Hox 1.5 homeo box. A fusion protein containing the Hox 1.5 homeo domain constructed in lambda gt11 also binds the same 753-bp DNA fragment. Specific binding of the fusion protein to the upstream DNA fragment shows that …

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Effects Of Corn Oil And Benzyl Acetate On Number And Size Of Azaserine-Induced Foci In The Pancreas Of Lew And F344 Rats, Daniel S. Longnecker, B D. Roebuck, Thomas J. Curphey, Evelyne Lhoste, Charles I. Coon, Denise Macmillan Sep 1986

Effects Of Corn Oil And Benzyl Acetate On Number And Size Of Azaserine-Induced Foci In The Pancreas Of Lew And F344 Rats, Daniel S. Longnecker, B D. Roebuck, Thomas J. Curphey, Evelyne Lhoste, Charles I. Coon, Denise Macmillan

Dartmouth Scholarship

The response of LEW and F344 strain rats to the pancreatic carcinogen azaserine was compared using the size and number of azaserine-induced acidophilic acinar cell foci and nodules as parameters in a 4-month experiment. A second experiment compared the effect of corn oil intake by gavage and dietary routes on the growth of azaserine-induced pancreatic lesions in LEW rats. A third experiment tested the activity of benzyl acetate in regard to its ability to induce acinar cell foci or to promote the growth of such foci in azaserine-treated rats. The results showed that equivalent doses of azaserine induce two to …

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The Orbital Period Of The Optical/X-Ray Burster X1735-444 (V926 Sco), R. H. D. Corbet, J. R. Thorstensen, P. A. Charles, J. W. Menzies Sep 1986

The Orbital Period Of The Optical/X-Ray Burster X1735-444 (V926 Sco), R. H. D. Corbet, J. R. Thorstensen, P. A. Charles, J. W. Menzies

Dartmouth Scholarship

We present extensive CCD photometry of the optical counterpart of X1735–444 which reveals the orbital period of the system. It is periodically variable with a period of 4.654 hr and a full amplitude of 0.15 mag. The mean modulation is quasi-sinusoidal; there are, however, also significant intrinsic deviations from the mean light curve.

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There Is A Planar Graph Almost As Good As The Complete Graph, L Paul Chew Jun 1986

There Is A Planar Graph Almost As Good As The Complete Graph, L Paul Chew

Dartmouth Scholarship

Given a set S of points in the plane, there is a triangulation of S such that a path found within this triangulation has length bounded by a constant times the straight-line distance between the endpoints of the path. Specifically, for any two points a and b of S there is a path along edges of the triangulation with length less that sqrt(10) times [ab], where [ab] is the straight-line Euclidean distance between a and b. The triangulation that has this property is the L1 metric Delauney triangulation for the set S. This result can be applied to motion planning …

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A Procedure For Testing Cored Ice Under Uniaxial Tension, Russell W. Lee May 1986

A Procedure For Testing Cored Ice Under Uniaxial Tension, Russell W. Lee

Dartmouth Scholarship

A procedure is described for testing cored ice specimens under uniaxial tension. The procedure incorporates an end-capping system described by Cole and others (1985), two carpeted Synthane end caps, and extensometers mounted directly on the ice. Use of the procedure has resulted in a successful test rate of 75%

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Computing The Largest Empty Rectangle, B. Chazelle, R. L. Drysdale, D. T. Lee Feb 1986

Computing The Largest Empty Rectangle, B. Chazelle, R. L. Drysdale, D. T. Lee

Dartmouth Scholarship

We consider the following problem: Given a rectangle containing N points, find the largest area subrectangle with sides parallel to those of the original rectangle which contains none of the given points. If the rectangle is a piece of fabric or sheet metal and the points are flaws, this problem is finding the largest-area rectangular piece which can be salvaged. A previously known result [13] takes $O(N^2 )$ worst-case and $O(N\log ^2 N)$ expected time. This paper presents an $O(N\log ^3 N)$ time, $O(N\log N)$ space algorithm to solve this problem. It uses a divide-and-conquer approach similar to the ones …

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A Dna Sequence Analysis Program For The Apple Macintosh, Robert H. Gross Jan 1986

A Dna Sequence Analysis Program For The Apple Macintosh, Robert H. Gross

Dartmouth Scholarship

This paper describes a new set of programs * for analyzing DNA sequences using the Apple Macintosh computer, a computer ideally suited for this kind of analysis. Because of the Macintosh interface and the availability of high quality software-only speech synthesis, these programs are truly easy to use. Instead of typing in commands, the user directs the program by making selections with the mouse, thereby eliminating most typographical and syntax errors. Output options are selected by “pressing buttons” and then clicking “OK” with the mouse. DNA sequences are confirmed by having the program speak them. The high resolution graphics on …

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