Preliminary Study on Aquatic Snail Species of Bulinus globosus (Morelet, 1866) (Mollusca: Gastropoda: Planorbidae) from Nankumba Peninsula, Cape Maclear Island, South-East Arm of Lake Malawi

A NEW GENUS AND SPECIES OF AQUATIC CAVE-LIVING SNAIL FROM TASMANiA (MOLLUSCA: GASTROPODA: HYDROBIIDAE)

Although there are cave-dwelling hydrobiid snails known from many parts of the world, none have been described from Australia, although several species are known from New Zealand (Ponder 1966; Climo 1974, 1977). Recently several collections made by Stefan Eberhard in Tasmanian caves have been made available to the writer. All of the material is undescribed and most are species that are similar ...

Fine - Scale Habitat Associations of Soft - Sediment Gastropods at Cape Maclear , Lake Malawi

Schistosoma haematobium in Lake Malaŵi: susceptibility and molecular diversity of the snail hosts Bulinus globosus and B. nyassanus.

Intermediate hosts of Schistosoma haematobium, the causative agent of urinary schistosomiasis, in Lake Malaŵi include: Bulinus globosus, a member of the B. africanus group and B. nyassanus, a diploid member of the B. truncatus/tropicus species complex. We compared genetic variability between isolates of S. haematobium from the southern part of the lake (Cape Maclear), where both B. globosus and...

the effect of traffic density on the accident externality from driving the case study of tehran

در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...

Geographical distribution and habitat preferences of the invader freshwater snail species Lymnaea columella (Mollusca: Gastropoda) in South Africa.

The present geographical distribution of Lymnaea columella, as recorded in the National Freshwater Snail Collection, is described and discussed. It appears that L. columella is the most successful colonist of all the freshwater snail species in South Africa, and, together with Bulinus tropicus and Lymnaea natalensis, it forms the most widely distributed freshwater snail species in the region. D...

effects of first language on second language writing-a preliminary contrastive rhetoric study of farsi and english

to explore the idea the investingation proposed, aimed at finding whether the performances of the population of iranians students studying english in an efl context are consistent in l1 and l2 writing taks and whether there is a cross-linguistic transfer in this respect. in this regard the subjects were instructed to write four compositions-two in english and two in farsi-which consisted of an ...