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Start Over Coverage 11-15 Format svazek

2. Gyrodactylus eyipayipi sp. n. (Monogenea: Gyrodactylidae) from Syngnathus acus (Syngnathidae) from South Africa

Creator:
Vaughan, David B., Christison, Kevin W., Hansen, Haakon, and Shinn, Andrew P.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Monogenea, Gyrodactylus eyipayipi, Syngnathus acus, pipefish, public aquarium, and South Africa
Language:
English
Description:
Gyrodactylus eyipayipi sp. n. is described from the skin, gills, flute and male brood pouch of captive specimens of the greater pipefish Syngnathus acus L., collected for and maintained at the Two Oceans Aquarium in Cape Town, South Africa. It is the first marine Gyrodactylus species reported from the African continent. The new species is compared to the three known Gyrodactylus species affecting syngnathiform hosts (G. pisculentus Williams, Kritsky, Dunnigan, Lash et Klein, 2008, G. shorti Holliman, 1963, and G. syngnathi Appleby, 1996). Although all four species have similar-sized and shaped attachment hooks with some overlap, separation of the species is possible using marginal hook morphology. The marginal hooks of G. eyipayipi measure (mean) 30 µm in total length and are larger than those of the three other species (mean, 24-28 µm). Gyrodactylus eyipayipi can also be discriminated based on differences in the shape of the marginal hook sickle notably by its long sickle point which extends far beyond the toe, its blunt rounded toe and, by the approximate rectangular shape to the base of the sickle. By comparison, the sloping toe regions of G. pisculentus and G. syngnathi give the sickle bases an approximately triangular shape, whilst the short sickle point and open aperture to the sickles of G. shorti allow for their discrimination from G. eyipayipi.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Photosynthetic characteristics of chloroplasts of primary wheat leaves grown under different irradiance

Creator:
Behera, Rajendra K. and Choudhury, Nakul K.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
carotenoids, chlorophyll fluorescence, Hill activity, leaf ageing, membrane polarisation, senescence, Triticum aestivum, and wheat
Language:
Multiple languages
Description:
The rate of accumulation of total chlorophyll (Chl) and carotenoids (Car) of leaves grown under high irradiance, HI (30 and 45 W m-2) was faster than at moderate irradiance, MI (15 W m-2). However, the senescence phase started earlier in the samples and proceeded at a faster rate. Chl a/b and Chl (a+b)/Car values showed faster loss of Chl a (compared to Chl b) and Chl (a+b) (compared to Car) in HI leaves. Protein accumulation and loss were also similar to that of Chl (a+b) content. Increase in Chl fluorescence during the development phase may suggest a gradual change in thylakoid organisation, however, the temporal kinetics were different in HI and MI samples. Increase in fluorescence polarisation during senescence of HI leaves compared to the control (MI) suggests conversion of thylakoid membranes to gel phase. Chloroplasts prepared from HI seedlings showed higher rate of photochemical activities, however, the activity declined earlier and at faster rate compared to the control. and Rajendra K. Behera, Nakul K. Choudhury.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public