On certain genera of atherine fishes

Blood cell formation in certain teleost fishes.

By WI. T. CATTON, M.SC. T HE ADVANCES in our knowledge of blood-cell formation in the lower vertebrates have been due largely to Downey,6 and to Jordan and his associates.’#{176}’2 A comprehensive survey of the “lymphoid” tissue in the kidneys of many fishes was made by Drzewina,7’ 8 and a more detailed study was reported by Downey6 on the hematopoietic renal tissue of the spoonbill sturgeon, P...

Some Observations on the Respiration of Certain Tropical Fresh-water Fishes

extensions, minimality and idempotents of certain semigroup compactifications

در فصل اول مقدمات و پیش نیازهای لازم برای فصل های بعدی فراهم گردیده است . در فصل دوم مساله توسیع مورد توجه قرار گرفته و ابتدا شرایطی که تحت آن از یک فشرده سازی نیم گروهی خاص یک زیرگروه نرمال بسته یک گروه به یک فشرده سازی متناظر با فشرده سازی اولیه برای گروه رسید مورد بررسی قرار گرفته و سپس ارتیاط بین ساختارهای مختلف روی این دو فشرده سازی از جمله ایده آل های مینیمال چپ و راست و... مورد بررسی قرا...

New oxyuroid nematodes of the genera Ichthyouris and Spinoxyuris from South American freshwater fishes.

Three hitherto unknown oxyuroid nematode species of the family Pharyngodonidae are described from the intestine of South American freshwater fishes, two of them being established as species new to science: Spinoxyuris annulata sp. n. from Myleus ternetzi (Norman) (Serrasalmidae) from French Guiana (Sinnamary River) and Ichthyouris ovifilamentosa sp. n. from Cichlasoma sp. (Cichlidae) from Amazo...

A Note on Artinianess of Certain Generalized

Let ?: R0?R be a ring homomorphism and suppose that a and a0, respectively, are ideals of R and R0 such that is an Artinian ring. Let M and N be two finitely generated R-modules and suppose that (R0,m0) is a local ring. In this note we prove that the R-modules and are Artinian for all integers i and j, whenever and . Also we will show that if a is principal, then the R-modules and ...