203,975 research outputs found
Improved fisheries productivity and management in tropical reservoirs
No full textThe objective of the project was to contribute to the current research on reservoirs enhancement fisheries in tropical countries through the implementation of a series of action-research activities implemented in two small reservoirs in the Indo-Gangetic basin in India, and two very large reservoirs in Africa, the Lake Nasser (Egypt), and the Volta Lake (Ghana). Socio-institutional analyses were also conducted in these reservoirs to improve our knowledge regarding some of the main social processes that influence reservoir productivity. Overall the results of the project stress that while the natural biophysical constraints of the reservoirs are important in defining the ecological production processes, it is the socio-economic settings characterizing the community/societies around the reservoirs that eventually shape the human production enhancement possibilities.Reservoir fisheries, Inland fisheries, Sociological aspects, Socioeconomic aspects, Africa, Nasser L., Ghana, Volta L.,
Vertical distribution of zooplankton in Lake Nasser
No full textThe composition and distribution of zooplankton communities in three depths (surface, 10–5 m and 20–15 m depths) along main channel of Lake Nasser were studied in 2013. The density of total zooplankton was increased to maximum during winter and autumn at surface water (39,362 and 63,100 Ind. m−3, respectively) and gradually decreased with depth until attaining the lowest average density at 20–15 m (12,460 and 8976 Ind. m−3). During spring and summer, zooplankton was irregularly distributed through the water profile, where the highest average density was recorded at 10–5 m depth (66,007 and 66,734 Ind. m−3). Copepoda was the dominant zooplankton group at all depths, it represented about 70–76.2% of the total zooplankton count. Cladocera formed about 13.4%, 14.5% and 11% of total zooplankton density for surface, 10–5 m and 20–15 m depth. It was decreased with increasing depth during winter and autumn; however it attained its maximum density at 10–5 m depth during spring and summer. Rotifera average density decreased with increasing depth. The dominant zooplankton species inhabiting Lake Nasser were strongly temperature-dependent. The study recommends the introduction of some pelagic fish species to consume the high persistence of zooplankton community at the upper 10 meters of water column
Microplitis narendrani Ranjith & Nasser, sp. nov.
No full textMicroplitis narendrani Ranjith & Nasser sp. nov. Holotype, female (♀), body length 5.2 mm, fore wing 3.9 mm, ovipositor 0.2 mm, antenna 5.9 mm. Material examined. Holotype, female (♀), “ India, Kerala, Palakkad, Pattambi, 10 ° 48 ’ 77.2 ” N, 76 ° 11 ’ 80.6 ” E, 16.ii. 2014, emerged from Psalis pennatula Fab., Coll. Ranjith, A.P. ”. Paratypes: 1 ♀ with same collection data, 1 ♂ “ India, Kerala, Palakkad, Pattambi, 10 ° 48 ’ 77.2 ” N, 76 ° 11 ’ 80.6 ” E, 23.ii. 2014, emerged from Psalis pennatula Fab., Coll. Ranjith, A.P. ”, 2 ♂♂ “ India, Kerala, Malappuram, Chelari, 11 ° 11 ’ 21.2 ” N, 75 ° 89 ’ 0.3 ” E, 19.x. 2014, emerged from Psalis pennatula Fab., Coll. Rajesh, K.M. ”., 1 ♂ “ India, Kerala, Malappuram, Chelari, 11 ° 11 ’ 21.2 ” N, 75 ° 89 ’ 0.3 ” E, 19.x. 2014, emerged from Psalis pennatula Fab., Coll. Rajesh, K.M. ”. 5 ♂♂ “ India, Kerala, Malappuram, Calicut University, 11 ° 25 ’ 10.2 ” N, 75 ° 78 ’ 86 ” E, 29.x. 2014, emerged from Psalis pennatula Fab., Coll. Ranjith, A.P. ”. All type specimens are deposited in DZUC. Head: Sub circular in anterior view (Fig. 3 -B); lateral temples hidden behind eyes in anterior view; width of face (at widest) 0.5 × width of head; face 1.5 × as wide as long, rugose-punctate, pilose with medial carina, convex with medial protuberance below antennal sockets (Fig. 3 -B); clypeus strongly convex, punctate and pilose; length of clypeus 0.4 × its width; tentorial pit deep; maxillary palp four segmented; length of maxillary palp 1.1–1.3 × height of head in dorsal view; height of clypeus: inter tentorial distance: tentorio-ocular distance 7: 17.5: 3.5; length of eye 3.7 × length of malar space; length of malar space 1.2 × basal width of mandible; vertex, temples and frons punctate, setose with medial longitudinal carina extending from medial ocellus to middle of antennal sockets, anterior frons with raised area in dorsal view; in lateral view medial temples 0.6 × width of eye; eyes pilose (Fig. 3 - B); in dorsal view width of head 2.4 × its length; ocelli normal size forming obtuse triangle; POL 2 × OOL; occiput smooth; length of antennae 1.1 × length of body; scape and pedicel 0.8, 0.3 × as long as wide; length of first flagellomere 1.2 × second flagellomere; length of first, second and penultimate flagellomere 2.8, 2.4 and 2.9 × as long as wide respectively; terminal flagellomere acute, 3.9 × as long as its maximum width. Mesosoma: Mesosoma 1.3 × as long as high; mesoscutum punctate with pilosity; lateral lobes of mesoscutum rugose with prominent medial groove extending from anterior to posterior (Fig. 3 -C); notauli impressed, rugulose, crenulate, meeting posteriorly in broad strigose-rugulose field, which is divided medially by prominent longitudinal carina (Fig. 3 -C); scutellar lunules wide medially divided by nine carinae; anterior scutellum areolate rugose, posterior half punctuate and pilose; posterior margin with two large laterally diverging, crenulate, short furrows which form carinate margin to posterior half of dorsal scutellum, these furrows partly extending on to and merging with rugosity of medial posterior band (Fig. 3 -C); propodeum with percurrent medial longitudinal carina surrounded by coarse rugosity with a well developed branched transverse carina extending to the spiracles (Fig. 3 - D); lateral pronotum with oblique crenulate furrow, rugulose dorsally and posteriorly; mesopleuron finely punctate, pilose in dorsal and anterior parts, the rest smooth, shining and glabrous; epicnemal furrow crenulate, reaching to anterior margin of mesopleuron; precoxal groove almost reaching epicnemal furrow; mesosternum sparsely pilose; hind coxa punctate, pilose without striate basally; length of hind femur 3 × its width; length of hind tibia 4 × its width; length of basitarsus 5 × its width; length of hind tibial spurs 0.47, 0.4 × hind basitarsus; hind tarsal claw normal size. Wings: Fore wing 2.8 × as long as wide (Fig. 3 -F); pterostigma 2.4 × as long as wide (Fig. 3 -F); 1 -R 1 short, 0.38 × distance from pterostigma to SR 1; 1 -M straight; areolet quadrangular; 1 -CU 1 0.2 × as long as 2 CU 1; angle between C+SC+R and 1 -SR 83 ° hind wing 2 -SC+R short but present; first submarginal cell elongate. Metasoma: T 1 1.7 × as long as wide, with broad shallow medial longitudinal depression, rugulose laterally; T 1 narrowing in anterior 1 / 3, widest medially, slightly narrowing in posterior 1 / 3, apical surface with shallow depression (Fig. 3 -E); T 2 in medial line 0.8 × as long as T 3; T 2 smooth basally, sparsely pilose apically with oval medial field (Fig. 3 -E); T 3 –T 5 smooth, sparsely pilose posteriorly; T 6 and T 7 faintly punctate with pilosity; ovipositor sheath rounded apically, setose. Colour: Head and mesosoma black, metasoma orange brown, T 1 dark brown, palps yellow, clypeus brown, ocelli yellow, antennae brownish black, fore, mid tibiae and tarsi yellow to brown, hind tibia apically black, rest yellowish brown, hind tarsus black except basitarsus, hind tibial spur yellow, wings hyaline without infuscation, tegulae black, venation brown, pterostigma yellow on proximal 1 / 3, rest black (Fig. 3 -F). Male: Same as female except body length 3.3 mm. Distribution. India (Kerala). Host. Psalis pennatula Fab. (Lepidoptera: Erebidae). Etymology. Microplitis narendrani is named in honor of late Dr T.C. Narendran, Kerala, India, in recognition of his four decades of extraordinary work on parasitic Hymenoptera. Variation. Number of carinae dividing the scutellar lunules varies from eight–nine. Discussion. This new species is closely related to M. carinicollis in its large body size, T 1 sub-parallel sided, with medial longitudinal groove. It differs in the following characters, mesoscutum with medial furrow (mesoscutum without medial furrow in M. carinicollis), scutellum rugose (in M. carinicollis scutellum rugulose) and presence of a longitudinal carina between antennal sockets (in M. carinicollis longitudinal carina absent). This species is also related to M. pennatulae sp. nov. in having the mesosoma 1.3 × as long as high, T 1 1.7 × as long as wide, presence of longitudinal carina between antennal sockets and T 2 with distinct median field. It differs in the following characters, mesoscutum with medial furrow (in M. pennatulae sp. nov. medial furrow on mesoscutum indistinct), lateral temples hidden behind eyes in anterior view (in M. pennatulae sp. nov. lateral temples slightly visible in anterior view), length of malar space 1.2 × basal width of mandible (in M. pennatulae sp. nov. malar space 1.9 × basal width of mandible), scutellar lunules divided by eight–nine carinae (in M. pennatulae sp. nov. scutellar lunules divided by six–seven carinae).Published as part of Ranjith, A. P., Rajesh, K. M. & Nasser, M., 2015, Taxonomic studies on Oriental Microplitis Foerster (Hymenoptera: Braconidae, Microgastrinae) with description of two new species from South India, pp. 369-415 in Zootaxa 3963 (3) on pages 377-379, DOI: 10.11646/zootaxa.3963.3.4, http://zenodo.org/record/23526
Tolfenamic acid downregulates BACE1 and protects against lead-induced upregulation of Alzheimer's disease related biomarkers.
No full textNeuroscience
M Subaiea,Gehad:
H Zawia,Nasser
First Report of the Indian Date Palm Leaf Miner, Javeta pallida Baly (Coleoptera: Chrysomelidae: Cassidinae: Coelaenomenoderini), on Pygmy Date Palm, Phoenix roebelenii O'Brien (Arecaceae)
No full textShameem, K. M., Prathapan, K. D., Nasser, M. (2017): First Report of the Indian Date Palm Leaf Miner, Javeta pallida Baly (Coleoptera: Chrysomelidae: Cassidinae: Coelaenomenoderini), on Pygmy Date Palm, Phoenix roebelenii O'Brien (Arecaceae). The Coleopterists Bulletin 71 (3): 528-529, DOI: 10.1649/0010-065X-71.3.528, URL: http://dx.doi.org/10.1649/0010-065x-71.3.52
Estimation of Reservoir Discharges from Lake Nasser and Roseires Reservoir in the Nile Basin Using Satellite Altimetry and Imagery Data
No full textThis paper presents the feasibility of estimating discharges from Roseires Reservoir (Sudan) for the period from 2002 to 2010 and Aswan High Dam/Lake Nasser (Egypt) for the periods 1999–2002 and 2005–2009 using satellite altimetry and imagery with limited in situ data. Discharges were computed using the water balance of the reservoirs. Rainfall and evaporation data were obtained from public domain data sources. In situ measurements of inflow and outflow (for validation) were obtained, as well. The other water balance components, such as the water level and surface area, for derivation of the change of storage volume were derived from satellite measurements. Water levels were obtained from Hydroweb for Roseires Reservoir and Hydroweb and Global Reservoir and Lake Monitor (GRLM) for Lake Nasser. Water surface areas were derived from Landsat TM/ETM+ images using the Normalized Difference Water Index (NDWI). The water volume variations were estimated by integrating the area-level relationship of each reservoir. For Roseires Reservoir, the water levels from Hydroweb agreed well with in situ water levels (RMSE = 0.92 m; R2 = 0.96). Good agreement with in situ measurements were also obtained for estimated water volume (RMSE = 23%; R2 = 0.94) and computed discharge (RMSE = 18%; R2 = 0.98). The accuracy of the computed discharge was considered acceptable for typical reservoir operation applications. For Lake Nasser, the altimetry water levels also agreed well with in situ levels, both for Hydroweb (RMSE = 0.72 m; R2 = 0.81) and GRLM (RMSE = 0.62 m; R2 = 0.96) data. Similar agreements were also observed for the estimated water volumes (RMSE = 10%–15%). However, the estimated discharge from satellite data agreed poorly with observed discharge, Hydroweb (RMSE = 70%; R2 = 0.09) and GRLM (RMSE = 139%; R2 = 0.36). The error could be attributed to the high sensitivity of discharge to errors in storage volume because of the immense reservoir compared to inflow/outflow series. It may also be related to unaccounted spills into the Toshka Depression, overestimation of water inflow and errors in open water evaporation. Therefore, altimetry water levels and satellite imagery data can be used as a source of information for monitoring the operation of Roseires Reservoir with a fairly low uncertainty, while the errors of Lake Nasser are too large to allow for the monitoring of its operation
Authoritarianism in Egypt and South Korea : praetorian regimes of Gamal Abdul Nasser and Chung Hee Park
No full textEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Range extension of the rare braconine genus, Lyricibracon Quicke (Hymenoptera: Braconidae), with the description of a new species from India
No full textRanjith, A. P., Santhosh, S., Nasser, M. (2017): Range extension of the rare braconine genus, Lyricibracon Quicke (Hymenoptera: Braconidae), with the description of a new species from India. Zootaxa 4227 (3): 422-430, DOI: https://doi.org/10.11646/zootaxa.4227.3.
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