The El-Ibrahimia Canal is one of the main irrigation sources in Egypt, that it supplies perennial to approximately 600 000 ha (one-fourth Egyptian cultivated land). An annual study on species composition microalgae attached submerged hydrophyte Myriophyllum spicatum L. was carried out from midautumn 2016 midsummer 2017. Epiphytic were represented by 109 related 66 genera. Diatoms most abundant ...

The occurrence of antibiotics in surface waters has been reported worldwide with concentrations ranging from ng L-1 to low µg L-1 levels. During environmental risk assessments, effects of antibiotics on algal species are assessed using standard test protocols (e.g., the OECD 201 guideline), where the cell number endpoint is used as a surrogate for growth. However, the use of photosynthetic rela...

The occurrence of antibiotic residues in the aquatic environment is an emerging concern. In contrast to daphnia and fish, algae are known to be particularly sensitive to antibiotic exposure. However, to date, a systematic evaluation of the sensitivity of different algal species to antibiotics has not been performed. The aim of the present study was therefore to explore the sensitivity of a batt...

A class of model equations that describe the bi-directional propagation of small amplitude long waves on the surface of shallow water is derived from two-dimensional potential flow equations at various orders of approximation in two small parameters, namely the amplitude parameter a 1⁄4 a=h0 and wavelength parameter b 1⁄4 ðh0=lÞ2, where a and l are the actual amplitude and wavelength of the sur...

Schistosomiasis continues to rank – following malaria – at the second position of the world’s parasitic diseases in terms of the extent of endemic areas and the number of infected people. There is yet no vaccine available and the current mainstay of control is chemotherapy with praziquantel used as the drug of choice. In view of concern about the development of tolerance and/or resistance to pr...

The Monogenea are an ideal group for investigations of the processes behind their past diversification and their present diversity for at least three reasons: they are diverse both in terms of morphology and numbers, they are generally host specific, and their phylogeny is well resolved, at least to the family level. The present investigation takes a broad look at monogenean diversity in order ...

This paper presents a review of long-term (2001–2018) original studies the algae flora hyperhaline Kuyalnyk estuary, 6 tributaries flowing into it (rivers, streams, water channels from ponds), ephemeral reservoirs located along estuary and 5 adjacent different types (ponds, reservoirs). The features distribution species in these organisms bodies basin, as well main environmental factors influen...