A signaling pathway active on the ventral side of the Drosophila embryo defines dorsoventral polarity. A cell surface signal relayed by Toll, Tube and Pelle releases the Rel-related protein Dorsal from its cytoplasmic inhibitor Cactus; free Dorsal translocates into nuclei and directs expression of ventral fates. Using the yeast two-hybrid system and immunoprecipitation experiments, we define sc...

in this research, heat transfer enhancement and simultaneous effect of that on pressure drop inside condensers with twisted tape inserts are investigated. a refrigeration system is designed for attaining to maximum level of heat transfer with minimum pressure drop. the test condenser is a double pipe heat transformer with inner and outer diameter of 10.7mm and 12.7mm for internal pipe, respecti...

Previous studies have suggested several adaptive functions for the decorated tube caps of Diopatra cuprea (Polychaeta: Onuphidae). We experimentally tested the hypothesis that decoration provides crypsis. A series of field experiments quantified predation-related damage done to tube caps that were (1) devoid of decoration, (2) decorated with algae, or (3) decorated with shell fragments. If deco...

BACKGROUND During orthopedic operations, such as total hip replacement or total knee replacement, there is a lot of bone debris from bone cutting and reaming that commonly causes surgical suction devices to occlude many times, which can prolong the operative time and increase the amount of bleeding for the patient. MATERIALS AND METHODS We developed a surgical filter suction system that we ca...

The extremely rapid reflection of a shock wave from the end wall generated in tube, addition to high-frequency content pressure, inevitably also excites mechanical vibrations. These can potentially produce acceleration-induced spurious signals as part dynamic output pressure measurement system being calibrated. This paper proposes and evaluates method for correcting frequency response obtained ...

Tube-based model predictive control (MPC) methods leverage tubes to bound deviations from a nominal trajectory due uncertainties in order ensure constraint satisfaction. This paper presents novel tube?based MPC formulation based on system level disturbance reachable sets (SL?DRS), which the affine parameterization (SLP). We show that imposing finite impulse response (FIR) SLP guarantees contain...

Abstract The heat transfer characteristics of the collector tube is one cores a linear Fresnel reflector-solar thermal power generation system (LFR-CSP). In this paper, model reflective single-tube compound parabolic (CPC) established. light normal operating conditions during day, it found that direct irradiation (DNI) and loop length exert significant effects on collection loss performance ref...

1. The K and Cl~ levels and osmotic concentration of the tube feet fluid in intact starfish (Asterias forbesi) are higher than that in the external sea water or perivisceral (coelomic) fluid. 2. The increase in K+ in the fluid in the tube feet lumen is brought about by the active secretion of K+ by the tube feet epithelium. 3. No exchange of material from the external environment with the more ...

The entire tube wall of Dodecaceria caulleryi and D. coralii is composed of thin calcareous lamellae with a spherulitic prismatic ultrastructure. In Diplochaetetes mexicanus the tube ultrastructure is similar, but contains also some lamellae with a homogeneous structure. The biomineralization system of cirratulids has not evolved since the appearance of calcareous tubes in the Oligocene. The tu...