chlorophyll a

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Related to chlorophyll a: chlorophyll b, chlorophyll c

chlor·o·phyll a

magnesium(II) pheophytinate a [(pheophytinato a)magnesium(II)]; the major pigment found in all oxygen-evolving photosynthetic organisms (higher plants, and red and green algae).
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References in periodicals archive ?
For chlorophyll a, there are two major absorption bands, Soret and [Q.sub.y] at 443 and 671 nm, respectively.
It suggested that the SPAD was not as sensitive as the two chlorophyll a fluorescence parameters: Fv/Fm and PI.
For 'Prata-Ana', direct correlations with high magnitude and significant (p < 0.05) were observed between the leaf contents of N and Mg and the index of chlorophyll a (0.93 and 0.89, respectively).
The energy is passed on to the chlorophyll a who is delighted.
Table 2: Pigment concentration of chlorophyll a, chlorophyll b, carotenoids and anthocyanins measured at four developmental stages in inflorescence bract of 'Red' and 'Yellow' cultivars of C.
To see whether the slug could actually make new chlorophyll a, Pierce and his colleagues turned to slugs that hadn't fed for at least five months and had stopped releasing digestive waste.
Chlorophyll a concentrations both inside and outside cages increased significantly with increasing nitrogen load ([r.sup.2] = 0.999(*), [r.sup.2] = 0.965(*); [ILLUSTRATION FOR FIGURE 1 OMITTED]).
(1985); in determining the activity of chlorophyllase, the substrate of chlorophyll a was purchased from Sigma Chemical Company, the enzyme solution (chlorophyllase-containing solution) was prepared according to the methods described by Mosequera-Minguez et al.
Polyphasic chlorophyll a fluorescence transient in plants and cyanobacteria.
Traits evaluated include: chlorophyll a (g/g leaf), chlorophyll b(g/g leaf), chlorophyll ab(g/g leaf) total chlorophyll (spad), yield per hectare (kg/ha) and stomatal Conductance (mmol H2o.
Taking account mentioned above all research of the effect of [gamma]-radiations of the soil after NATO bombing the plant photosynthesis and relative change of photosynthesis pigments (Chlorophyll a,b) and carotenoides) was based on fluorescence measurement.