The technology of glass production is thought to have been known since ~2500 BC (1-3) and had become fairly advanced within the Roman Empire (4). At that time glass was widely used for blown vessels, pitchers, beakers, bowls, and other tableware, with such glass objects becoming as widespread as pottery (1-3,5). The use of glass for laboratory apparatus, however, was rather limited because of a...

In the present study rotifer Brachionus plicatilis was cultured under controlled laboratory conditions, in Marine Science Center, Dept. of Biology, temperature 22 ºC. The rotifers feeding on two type food, first baker's yeast and second animal manure. General, used manure better than yeast. density culture at ºC which fed 145 ind /ml, while growth rate 2.67 doubling time 0.25 day. While, densit...

In these experiments the term “whole alfalfa” is used to indicate the part of the plant which is harvested in the usual hay-making operation. In all cases in which defrosted tissue was used the material wss frozen at 15” and defrosted immediately before use. In part of the experiments, only the leaves were subjected to treatment, while in others whole alfalfa was used. In all experiments, only ...

unless anaerobic reactor and digesters have been applied worldwide, suitable operation is still challenging. threats of facing with low efficiency operationally, their sensitivity and souring phenomenon are part of typical problems. in this article, the application of electrolysis as an upgrading alternative is investigated for the purpose of controlling its capability on effluent quality promo...

1. In order to complete the demonstration that the viscosity of suspensions of powdered gelatin in water is influenced by electrolytes in a similar way as the viscosity of solutions of gelatin, it is necessary to prove that the characteristic valency effect exists also in the case of the viscosity of suspended particles of solid gelatin in water. This proof is furnished in Fig. 1. 0.5 gm. of fi...

Sea Urchin is one of the most useful tools in developmental biology studies because this organism has the simplest kind of developmental stages. We aimed to determine developmental stages and timetable of Echinometra mathaei embryo (the species of Persian Gulf). The spawning of E. mathaei was induced by 0.5M KCl injection (1ml) into the coelomic cavity. After fertilization, embryos wer...

In this study, different glasses were investigated to improve reusable investments. Borosilicate glass (BSG) powder and soda-lime glass (SLG) powder were prepared by milling broken beakers and microscope slides, respectively, and used in experimental investments (I-BSG, I-SLG) by blending glass powder (10 wt%) with cristobalite (90 wt%). Some properties and casting fits were evaluated with comm...

Sea Urchin is one of the most useful tools in developmental biology studies because this organism has the simplest kind of developmental stages. We aimed to determine developmental stages and timetable of Echinometra mathaei embryo (the species of Persian Gulf). The spawning of E. mathaei was induced by 0.5M KCl injection (1ml) into the coelomic cavity. After fertilization, embryos were placed ...