Blue and Red Light in Photosynthesis - excite Deutschland
You may have heard about the importance of blue and red light for plant photosynthesis ..
Effect of light intensity on photosynthesis ..
Dairy producers are constantly searching out new management techniques to improve production efficiency and cash flow. Photoperiod management has received interest lately as a cost-effective method to increase production in lactating cows. That is because in cows exposed to long days, i.e. 16 to 18 hours of light and a 6 to 8 hour period of darkness, daily milk production increases an average of 2 liters/cow, relative to those on natural photoperiods (5). The purpose of this paper is to review the evidence for a response to long days, describe the physiologic basis for the response, and discuss the economic justification for implementing photoperiod management.
The energy released by burning fuel or digesting food was once energy from the sun that was captured by plants in the chemical process that forms plant matter (from air and water). (Boundary: The fact that plants capture energy from sunlight is introduced at this grade level, but details of photosynthesis are not.)
Influence of light intensity on leaf net photosynthesis ..
Some materials allow light to pass through them, others allow only some light through, and others block all the light and create a dark shadow on any
Blocking out the sun alone is of extreme concern regarding photosynthesis, but when one considers the fact that the light which does get through the toxic particulates is in altered form, the concern is much greater still.
Chemical Manipulation of Photosynthesis …
The impact of long days on milk production was first observed in 1978 by researchers at Michigan State University (13). Cows were placed on 16 hours of light, 8 hours of darkness (16L:8D) or left on natural photoperiod at calving. The study was conducted between September and March, when natural light was each day. Over the first 100 days postpartum, cows on long days produced 2.0 L/d more milk than those on natural photoperiod. At 100 days, the treatments were switched and the cows previously on natural photoperiod increased milk production, whereas the cows previously on 16:8D decreased milk yield. Those results suggested that exposure to long days increased milk yield and did so across production levels. Since the first study, at least nine other experiments at seven laboratories across North America and Europe have confirmed the response (summarized in Figure 1). Based on those studies, it is expected that cows on long days will produce an average of 2 litres ore than control animals on natural photoperiod.
I used this to do the image manipulation. I hear there are processing tools out there, I'm going to give them a try, and perhaps create a macro for photoshop to make it quicker.
Ch 7 Photosynthesis - practice test Flashcards | Quizlet
Control of Photosynthesis by Light Intensity ..
Manipulation of plant structure can strongly affect light distribution in the canopy and photosynthesis
Chemical Manipulation of Photosynthesis and Photorespiration
Blue and Red Light in Photosynthesis - excite Schweiz
Blue and Red Light in Photosynthesis
Another area of research within artificial photosynthesis is the selection and manipulation of ..
canopy photosynthesis by the manipulation of leaf light response ..
Paraffin lamps have traditionally been used in greenhouses. Their use increases the rate of photosynthesis because as well as the light generated from the lamps, the burning paraffin produces heat and carbon dioxide too.
Wood Manipulation | Superpower Wiki | FANDOM …
What is the basis of the response? Recent studies have shed light on the potential physiologic mechanism for the increase in yield from cows on long days. Differences in light exposure alter secretion of a number of hormones. Indeed, those hormonal shifts drive the commonly observed changes in reproductive activity in other species. The first hormone impacted by photoperiod is melatonin, which is secreted in response to darkness. Thus, in cows and other animals, a long day actually reduces the duration of elevated melatonin (5). Animals use this pattern of melatonin to track daylength, and then alter secretion of other hormones. In cows, a long day pattern is associated with higher secretion of the hormone insulin-like growth factor-I (IGF-I; 6). Higher IGF-I, in turn, is thought to increase milk yield. It is of interest that bovine somatotropin (bST), which also increases milk yield, stimulates IGF-I release as well (2). This similarity of mechanism led to a test of the effect of bST and long days on milk yield.
Variation of Plant Manipulation
While almost all animals respond to photoperiod in some way, it is usually associated with reproductive events (17). Indeed, poultry producers use lighting to stimulate, layers and sheep and horse breeders manipulate the breeding season with light exposure. Though not seasonal breeders, photoperiod can affectreproduction in cattle. For example, long days hasten puberty in heifers relative to natural daylength. Long days are also thought to reduce the delay in return to cyclicity following parturition, particularly in the winter (8). However, reproductive changes in response to photoperiod are subtle in cattle in comparison with the effect on lactation.
Plant Manipulation - Superpower Wiki
Lactation, however, is not the only time during the annual milk production cycle when photoperiod treatment is recommended. Recent studies suggest that appropriate photoperiod treatment of the dry cow can markedly enhance milk yield in the subsequent lactation. We treated cows with either long or short (8L: 160) days during the entire 60-d dry period (10). Cows were then exposed to natural photoperiod after parturition, which occurred between November and January. Surprisingly, over the first 120 days of lactation, cows treated with short days when dry produced 3.2 L/d more milk than the cows on long days. It is important to note that all cows were housed together, fed the same diet, and managed identically following parturition. Our data are consistent with other recent reports of the impact of photoperiod manipulation during the dry period (1,14). Thus, in contrast to the benefits of long day photoperiod for lactating cows, treatment with short days is recommended for dry cows.
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