In Drosophila melanogaster, the process of oogenesis is initiated with the asymmetric division of a germline stem cell. This division results in the self-renewal of the stem cell and the generation of a daughter cell that undergoes four successive mitotic divisions to produce a germline cyst of 16 cells. Here, we show that shut-down is essential for the normal function of the germline stem cell...

To Barbara, my sweet nightingale, whose existence is my lantern in the night. If you shut the door to all errors, truth will be shut out.

Chemical reactions lie at the heart of many biological processes, from photosynthesis and respiration to cell signaling and drug metabolism. Thanks to an atmosphere rich in oxygen, many organisms use oxygen to carry out these life processes. But oxygen metabolism produces highly toxic by-products called reactive oxygen species. When oxidation outpaces detoxifying reactions, oxidative stress occ...

As a result of intrastratal and interlayer flows produced water varying intensity, 25% oil gas wells are water-encroached in the world. Due to behind casing flow during operation generally reduces field's development efficiency. In study, 1-6% (weight) polyethylene polyamine (PEPA) was added which cement mixture will be prepared. The temperature dependence beginning end setting time obtained mo...

The trouble began for Toledo, Ohio, in the spring of 2014, when extreme storms washed an unusually high pulse of nutrients into Lake Erie. By late summer, a massive bloom of blue-green algae, otherwise known as cyanobacteria, had shut down the city’s drinking water system. Powered by nutrients from agricultural runoff and the warm, calm summer waters, the algae spread across the lake and slowly...

The failure of steel liner of pressure shafts of hydropower plants can have catastrophic consequences. The partial or total loss of the liner support’s rigidity is characterized by a local change of the hydro-acoustic properties and creates reflection boundaries for the water waves. This paper presents a new monitoring method for detecting and locating weak reaches by processing reflected water...