scholarly journals Studies on the Photosynthesis of Forage Crops : 1. Diurnal changes in the photosynthesis of several grasses and barley seedlings under constant temperature and light intensity.

1963 ◽  
Vol 31 (4) ◽  
pp. 311-314 ◽  
Author(s):  
Yoshio MURATA ◽  
Junichiro IYAMA
Keyword(s):  
Light Intensity ◽  
Constant Temperature ◽  
Diurnal Changes ◽  
Forage Crops

Sperm Transfer in Gypsy Moths: Effect of Constant or Cyclic Temperature and Constant Light or Darkness during the Pupal Stage

1997 ◽  
Vol 32 (3) ◽  
pp. 321-331 ◽  
Author(s):  
F. I. Proshold
Keyword(s):  
Light Intensity ◽  
Constant Temperature ◽  
Lymantria Dispar ◽  
Pupal Stage ◽  
Sperm Transfer ◽  
Constant Light ◽  
Constant Darkness ◽  
Gypsy Moths ◽  
Cyclic Temperature ◽  
Full Complement

Sperm transfer and fertility of the gypsy moth, Lymantria dispar (L.), held as pupae under constant temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h were compared with males held in cyclic temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h. Constant temperature and constant light or darkness severely reduced its ability to transfer sperm. Males held under constant light were more severely affected than males held in darkness, but sperm transfer was not correlated with light intensity (between 80 and 3960 lux). Nearly all males held under constant light and most held under constant darkness were sterile or partially sterile. In either case, sterility was caused by poor sperm transfer. Females with a full complement of sperm were fertile regardless of holding condition of male pupae. The sterilizing effect of constant light or darkness was overridden by cyclic temperature of 28°C for 16 h and 22°C for 8 h. At a photoperiod of 16:8 h, pupae held in constant 28°C transferred less sperm than those held at 25°C. Pupae held at constant 30°C were sterile, but those held at 30°C for 16 h and 25°C for 8 h transferred similar quantities of sperm as males held at constant 28°C.

Diurnal changes in light intensity inside the pregnant uterus in sheep

1998 ◽  
Vol 52 (2) ◽  
pp. 123-130 ◽  
Author(s):  
Vı́ctor H. Parraguez ◽  
Francisco Sales ◽  
Guillermo J. Valenzuela ◽  
Marcela Vergara ◽  
Luis Catalán ◽  
...  
Keyword(s):  
Light Intensity ◽  
Diurnal Changes ◽  
Pregnant Uterus

scholarly journals Genetic Resources of Shade Tolerant Forage Crops

2017 ◽  
Vol 26 (2) ◽  
pp. 051 ◽  
Author(s):  
Nurhayati D. Purwantari
Keyword(s):  
Light Intensity ◽  
Genetic Resources ◽  
Oil Palm ◽  
Marginal Land ◽  
Forage Crops ◽  
Livestock Population ◽  
Oil Palm Plantation ◽  
High Production

<p class="awabstrak2">Forage crops are planted mostly in marginal land or integrated with other crops. Estate crops land is one of the alternative areas for forage crops plantation. Shortage of forage crops development under crop plantation is caused by limited light intensity, due to crop shading. Selecting forage crops adapted to estate crops plantation is crusial to achieve its high production and quality. Several grasses and legumes have been identified as forage crops that tolerant to shading of less than 40%, 40-60% and more than 60% light intensity. Some of them have been applied in the area of oil palm plantation to support the acceleration of livestock population.</p>

TAGESPERIODISCHE SCHWANKUNGEN DES NEUROHYPOPHYSÄREN OXYTOCINGEHALTES BEI MÄNNLICHEN WISTAR-RATTEN

1968 ◽  
Vol 58 (1) ◽  
pp. 98-100 ◽  
Author(s):  
Annemarie König ◽  
Brigitte Martin
Keyword(s):  
Antidiuretic Hormone ◽  
Constant Temperature ◽  
Adult Male ◽  
Wistar Rats ◽  
Diurnal Changes ◽  
Posterior Pituitary ◽  
Hormone Content ◽  
Male Wistar Rats ◽  
Diurnal Behaviour ◽  
Posterior Pituitary Lobe

ABSTRACT Adult male Wistar rats were kept at a constant temperature (22 ± 0.5° C) and in an alternating light-dark environment consisting of 12 hours of light with 150 lux (7 a. m. – 7 p. m.) and 12 hours of darkness (7 p. m. – 7 a. m.). In the months of March – December groups of animals were decapitated at 4 hourly intervals. Oxytocic activity of posterior pituitary lobe revealed diurnal changes with high values at 2 a. m. and low values at 6 p. m. The results are compared with the diurnal behaviour of antidiuretic hormone content of posterior pituitary lobe.

scholarly journals TEMPERATURE CHARACTERISTICS FOR THE GROWTH OF THE SPORANGIOPHORES OF PHYCOMYCES

1928 ◽  
Vol 11 (4) ◽  
pp. 407-413 ◽  
Author(s):  
E. S. Castle
Keyword(s):  
Light Intensity ◽  
Constant Temperature ◽  
Constant Light ◽  
Temperature Characteristics

1. With constant temperature and light intensity, the rate of elongation of a sporangiophore of Phycomyces is constant for many hours. 2. With constant light intensity, values of µ, the "critical thermal increment," have been computed for the elongation of different sporangiophores. These values group themselves closely about the modes 11,000, 16,000, 20,000, 26,000, and 33,000 calories. Sporangiophores from the same culture need not have similar increments. 3. The significance of these results for studies of growth is discussed.

EFFECT OF LEAF MATURITY, TEMPERATURE, CARBON DIOXIDE CONCENTRATION, AND LIGHT INTENSITY ON RATE OF PHOTOSYNTHESIS IN CLONAL LINES OF THE LOWBUSH BLUEBERRY, VACCINIUM ANGUSTIFOLIUM AIT. UNDER LABORATORY CONDITIONS

1965 ◽  
Vol 43 (8) ◽  
pp. 893-900 ◽  
Author(s):  
F. R. Forsyth ◽  
I. V. Hall
Keyword(s):  
Carbon Dioxide ◽  
Light Intensity ◽  
Constant Temperature ◽  
Carbon Dioxide Concentration ◽  
Vaccinium Angustifolium ◽  
Leaf Maturity ◽  
Agronomic Characteristics ◽  
Lowbush Blueberry ◽  
Rate Of Photosynthesis ◽  
Clonal Lines

The rate of apparent photosynthesis of the lowbush blueberry was determined in Warburg flasks using Pardee's CO2 buffers. A marked increase in rate of O2 evolution occurred as the temperature was raised from 13.0 to 29.5 °C. With a constant temperature of 25.0 °C the rate of O2 evolution increased as the CO2 concentration increased from 0.2 to 0.8%. The young and middle-aged leaves had a higher rate of apparent photosynthesis than the older leaves. The rate was higher at a light intensity of 1000 ft-c than at 650 ft-c at a CO2 concentration of 0.4%. At the higher light intensity a lowbush blueberry clone selected on the basis of superior agronomic characteristics had a significantly higher rate of apparent pholosynthesis than an average clone.

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