During inversion of a Volvox embryo, a series of cell shape changes causes the multicellular sheet to bend outward, and propagation of the bend from the anterior to the posterior pole eventually results in an inside-out spherical sheet of cells. We use fluorescent and electron microscopy to study the behavior of the cytoskeleton in cells undergoing shape changes. Microtubules are aligned parall...

a 3-month-old short haired pointer with crusty local alopecia around the eyes was presented to smallanimal hospital of tehran university. scraping and biopsy were obtained from lesions of affected area.notoedres sp. was diagnosed in skin scraping by parasitologic examination. furthermore, histopathology oflesions demonstrated moderate hyperplastic epidermis, parakeratosis and acanthosis.

  Various parasite species were found in Carassius carassius including Diplostomum spathaceum, Dactylogyrus sp.,Gyrodactylus sp. Ichthyophthirius multifiliis and Trichodinia sp . They were found in four rivers in West Azerbaijan Province (North-Western Iran) . A total of 207 live Carassius carassius from four rivers including Aras (72) Zariyneh (42) Nazlo (58) and Barandoz (35) were studied. Pa...

screening and identification of moderately halophilic protease producing bacteria from different regions of maharloo, a hypersaline lake in the southern area of iran, were the objectives of this study. in the preliminary screening, 16 isolates exhibited proteolytic activity on saline skim milk agar. all isolates were able to grow comfortably in the media containing 7-15% of salt. protease activ...

contamination of human and animal body tissues with flies’ larvae and diptera cause myiasis. a 26 yr old female patient refers to kashan shahid beheshti hospital, central iran because of urogenital infection, pain in the right part of stomach, smelly and reddish vaginal discharge and frequent urination. in the first checking, urine sample was taken. in the sample, active and alive larvae were s...

The sex-inducing pheromone of the multicellular green alga Volvox carteri is a glycoprotein that triggers development of males and females at a concentration <10(-16) M. By differential screening of a cDNA library, two novel genes were identified that are transcribed under the control of this pheromone. Unexpectedly, one gene product was characterized as a lysozyme/chitinase, and the other gene...