In experiments with the facultative Crassulacean acid metabolism (CAM) species, Mesembryanthemum crystallinum, only plants which received high levels of inorganic salts fixed substantial amounts of CO(2) by the CAM pathway. Equivalent osmolarities of polyethylene glycol 6000 did not yield any CAM fixation. Plant water potential and turgor pressure had no detectable influence on the amount of CA...

Numerous investigators have worked on the problem of determining the effect of small quantities of visible radiant energy on seedlings and other plants with stored foods. The literature is extensive and goes back over one hundred years. MAcDOUTGAL (6) has thoroughly reviewed the work before 1900 while TRUMPF (9) and BURKHOLDER (1) have reviewed this and much of the later work. The work before 1...

this study was aimed to assess the causes of the structural decline in the renewal rate of apristine oak forest close to rome (central italy) by analyzing long-term measurements of the water budget in open and fenced areas. despite dry climate conditions in the area, long-term soil moisture measurements at 100 cm soil depth indicated that an enough large amount of water is available to oaks dur...

Background: Tooth extractions are the most common cause of hospital admissions for children in England. Water fluoridation has potential to reduce this number by 60%, is backed scientific and public health communities, yet currently consumed only 10% population. Aims objectives: This ‘evidence-policy gap’ explored through Kingdon’s ‘multi-streams approach’ which provides insights into circumsta...

Partial root drying (PRD) is a new irrigation and plants growing technique which improves water use efficiency without significant yield reduction. In the present paper some of the recent data concerning PRD effects on crop plants are presented as well as some of our own results of PRD grown tomato plants. Tomato plants (Lycopersicon esculentum Mill.) were grown in commercial compost with the r...

It has been more than half a century that plant geneticists and breeders have been trying to assemble a combinationof genes in crop plants, in order to make them as suitable and productive as possible. Plant transformation technology incrop plants was first undertakenin the 1980s based on the ability of foreign gene integration into host plant genome andregeneration of transformed plant cells i...

In a number of extensive coastal areas in northwest Europe, large numbers of long-lived migrant birds eat shellfish that are also commercially harvested. Competition between birds and people for this resource often leads to conflicts between commercial and conservation interests. One policy to prevent shellfishing from harming birds is to ensure that enough food remains after harvesting to meet...