A Precise Laboratory Exercise Using a Vacuum Tube Bridge

1948 ◽  
Vol 16 (3) ◽  
pp. 151-155
Author(s):  
Edward H. Green
Keyword(s):  
Vacuum Tube ◽  
Laboratory Exercise

The Development and Investigation of a Numerical Dynamic Model of Vacuum-Tube Devices

2002 ◽  
Vol 58 (1-2) ◽  
pp. 8
Author(s):  
M. V. Glumova ◽  
M. D. Vorobyov ◽  
V. V. Starostenko
Keyword(s):  
Dynamic Model ◽  
Vacuum Tube

INFLUENCE OF WORKING FLUID ON THERMAL PERFORMANCE OF THERMOSYPHONS FOR APPLICATION IN HIGH PRESSURE VACUUM TUBE SOLAR COLLECTORS

2020 ◽  
Author(s):  
Guilherme Antonio Bartmeyer ◽  
Victor Vaurek Dimbarre ◽  
Pedro Leineker Ochoski Machado ◽  
PAULO HENRIQUE DIAS DOS SANTOS ◽  
Thiago Antonini Alves
Keyword(s):  
High Pressure ◽  
Thermal Performance ◽  
Working Fluid ◽  
Solar Collectors ◽  
Vacuum Tube

Laboratory Exercise on the Segregation of Flower Color and Related Genes Using Salpiglossis sinuata

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 555b-555
Author(s):  
Chiwon W. Lee
Keyword(s):  
Phenotypic Expression ◽  
Pollen Grains ◽  
Flower Color ◽  
Segregation Ratio ◽  
Crop Breeding ◽  
Flower Opening ◽  
Pigmentation Pattern ◽  
Laboratory Exercise ◽  
Demonstration Plant ◽  
Corolla Color

Velvet flower (Salpiglossis sinuata, Solanaceae) can be used as an excellent demonstration plant for horticultural crop breeding classes. Salpiglossis produces large trumpet-like flowers exhibiting an assortment of corolla color and pigmentation pattern. The pistil is large (3 to 4 cm long) with a sticky stigmatal tip and anthers can be easily emasculated prior to anthesis. The large pollen grains are shed in tetrads, which can be separated and individually placed on the stigma. It takes 8 to 9 weeks from seeding to blooming, with a prolific flowering cycle repeated in flushes. Numerous seeds (about 750/capsule) are obtained in 3 weeks after self- or cross-pollination. The influences of three genes that control flower color and pigmentation pattern can be conveniently demonstrated with their dominant and recessive alleles. The R gene controls flower color with red (RR or Rr) being dominant over yellow (rr) flower color. The D gene controls the density of pigmentation with solid (DD or Dd) color being dominant over dilute (dd) color. Corolla color striping is controlled by the St gene with striped (stst) being recessive to non-striped (StSt or Stst) pattern. For example, by using diploid lines of genotypes RRDD (red, solid), RRdd (red, dilute), or rrdd (yellow, dilute) and their crosses, students can easily learn a dominant phenotypic expression in the F1 hybrid and the digenic 9:3:3:1 segregation ratio in the F2 progeny. Another gene (C) that controls flower opening can also be used to show its influence on cleistogamous (closed, self-pollinated, CC or Cc) versus normal chasmogamous (open-pollinated, cc) corolla development. In addition, the induction and use of polyploid (4X, 3X) plants in plant breeding can be effectively demonstrated using this species.

A laboratory exercise using the microcomputer to determine nutrient recommendations and least-cost fertilizer blends

1984 ◽  
Vol 13 (1) ◽  
pp. 50-53
Author(s):  
Kenneth M. Oates ◽  
James Camberato ◽  
M. J. Vepraskas
Keyword(s):  
Laboratory Exercise
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