All Type of Science Subjects

Cloud computing is the use of computing resources (hardware and software) that are delivered as a service over a network (typically the Internet) while E-Learning is the currently fashionable term used to describe the diverse use of information and communications technologies to support and enhance learning, teaching and assessment from resource based learning. E-learning system is a welcome idea in this modern day life, because the massive proliferation of affordable computers, Internet broadband connectivity and rich education content has created a global phenomenon in which information and communication technology (ICT) is being used to transform education. This paper merge cloud-computing and e-learning to presents the design and implementation of cloud-based e-learning platform for scientific subjects. We use the three core science subjects (physics, chemistry and biology) as test bed for this research work. The choice of programming language is PHP (Hypertext pre-processor) for server-side scripting, Action script and Macromedia-Flash for media content authoring and MySQL as the back-end database.

Development of science and technology especially in developing nations demands the preparation of skilled individuals in science disciplines from lower levels of academic and skill training. This fact calls for the need to promote effective science teaching and learning in secondary schools. The purpose of this study was to examine the status of science teaching and learning, challenges facing the science learning in schools and opportunities for improvements. The study was conducted in four districts in Morogoro Region, Tanzania. Specifically, the study intended to identify the pass rates in science subjects, teachers' professional development, science teachers' teaching strategies, students' level of satisfaction with the teaching and students' readiness to take science subjects in their high schools. The study was conducted in twenty four secondary schools using a sample of 471 students and 66 teachers. The data from students and teachers were collected through a structured questionnaire and focus group discussions. The results revealed poor quality of science classroom teaching and a serious decline in interest of students in science subjects. It was therefore concluded that, teacher-students interaction and relationship in classroom teaching and learning of science need improvement. It is suggested that, future research can observe on the influence of social factors in the decline of interest in science subjects among secondary school students in Tanzania.

Rosette-type tegumental glands associated with aesthetasc sensilla in the olfactory organ of the Caribbean spiny lobster, Panulirus argus Abstract The lateral antennular flagellum of decapod crustaceans bears unique olfactory sensilla, namely the aesthetascs, and other sensilla types. In this study, we identify a new major tissue in the lateral flagellum of the Caribbean spiny lobster, Panulirus argus, namely "aesthetasc tegumental glands" (ATGs), based on immunostaining with antibodies against CUB serine protease (Csp), in situ hybridization with csp-specific probes, labeling with the F-actin marker phalloidin, labeling with the nuclear marker Hoechst 33258, and staining with methylene blue. Each ATG has 12-20 secretory cells arranged in a rosette. Each secretory cell has a Csp-immunoreactive basal portion and an apical portion containing granular material (metachromatic staining indicative of acid mucopolysaccharides). At the center of each secretory rosette is a phalloidin-positive common locus that gives rise to a main drainage duct projecting toward the cuticle. Scanning electron and light microscopy show that thin ducts traverse the cuticle and connect to "peg pores" proximal to the bases of the aesthetascs, with 3.4 peg pores per aesthetasc. Since the number of common loci is correlated with the number of peg pores, we conclude that each pore represents the outlet of one ATG, and that the secretions are released from them. We conclude further that ATGs and aesthetascs are functionally linked. We hypothesize that ATG secretions have antifouling and/or friction-reducing properties, and that they are spread over the surface of the aesthetascs by antennular grooming. A review of the literature suggests that ATGs are common in decapod crustacean antennules, and that rosette glands and grooming might be functionally coupled in other body areas.

Rosette-type tegumental glands associated with aesthetasc sensilla in the olfactory organ of the Caribbean spiny lobster, Panulirus argus Abstract The lateral antennular flagellum of decapod crustaceans bears unique olfactory sensilla, namely the aesthetascs, and other sensilla types. In this study, we identify a new major tissue in the lateral flagellum of the Caribbean spiny lobster, Panulirus argus, namely "aesthetasc tegumental glands" (ATGs), based on immunostaining with antibodies against CUB serine protease (Csp), in situ hybridization with csp-specific probes, labeling with the F-actin marker phalloidin, labeling with the nuclear marker Hoechst 33258, and staining with methylene blue. Each ATG has 12-20 secretory cells arranged in a rosette. Each secretory cell has a Csp-immunoreactive basal portion and an apical portion containing granular material (metachromatic staining indicative of acid mucopolysaccharides). At the center of each secretory rosette is a phalloidin-positive common locus that gives rise to a main drainage duct projecting toward the cuticle. Scanning electron and light microscopy show that thin ducts traverse the cuticle and connect to "peg pores" proximal to the bases of the aesthetascs, with 3.4 peg pores per aesthetasc. Since the number of common loci is correlated with the number of peg pores, we conclude that each pore represents the outlet of one ATG, and that the secretions are released from them. We conclude further that ATGs and aesthetascs are functionally linked. We hypothesize that ATG secretions have antifouling and/or friction-reducing properties, and that they are spread over the surface of the aesthetascs by antennular grooming. A review of the literature suggests that ATGs are common in decapod crustacean antennules, and that rosette glands and grooming might be functionally coupled in other body areas.