Models and experiments of the evolution of ageand/ or size-at-maturation in response to population harvesting have consistently shown that selective harvesting of older and larger individuals can cause earlier maturation. These predictions, however, are all based on single-species considerations and thus crucially neglect the selective forces caused or mediated by species interactions. Here we ...

OBJECTIVE Preparation of the great saphenous vein for coronary artery bypass grafts is usually performed through one or many cutaneous incisions. A technique of endoscopic harvesting is now available. An aim of the study was to compare both methods, prospectively. METHODS Sixty coronary artery bypass grafting patients were randomly assigned to two groups according to saphenous vein harvesting...

Hematopoietic stem and progenitor cell (HSPC) transplantations require prior harvesting of allogeneic or autologous HSPCs. HSPCs are usually present in bone marrow (BM) during the entire life, in cord blood (CB) at birth, or in peripheral blood (PB) under particular circumstances. HSPCs were first harvested in BM and later in CB and PB, as studies showed interesting features of such grafts. All...

multistage and semi-mechanized harvesting of rice in khouzestan province, iran, causes much loss. depending on available facilities and conditions, either spike-tooth or rasp-bar cylinders are employed with either direct or indirect combine harvesting methods. the present research studied the effect of these different harvesting methods on the amount of losses in two rice varieties in 2001-2002...

Vibration energy harvesting is being pursued as a means to power wireless sensors and ultra-low power autonomous devices. From a design standpoint, matching the electrical damping induced by the energy harvesting mechanism to the mechanical damping in the system is necessary for maximum efficiency. In this work two independent energy harvesting techniques are coupled to provide higher electrica...

BACKGROUND Photosynthetic light-harvesting proteins are the mechanism by which energy enters the marine ecosystem. The dominant prokaryotic photoautotrophs are the cyanobacterial genera Prochlorococcus and Synechococcus that are defined by two distinct light-harvesting systems, chlorophyll-bound protein complexes or phycobilin-bound protein complexes, respectively. Here, we use the Global Ocean...

In sustainable wireless sensor networks powered by ambient energy harvesting, node operation highly depends on the energy availability and harvesting rate. For them to support existing wireless sensor network applications, duty-cycling schemes need to adapt the nodes’ sleep-wake schedules according to energy harvesting and consumption rates. In this paper, we propose a harvesting-aware duty-cyc...

Energy harvesting is the process of foraging electrical energy from energy sources available in the environment. This paper reviews energy harvesting technology using PZT as the specific piezoceramic material with its modules to determine the capacitance for optimal energy-storage in piezoelectric vibration energy harvesting (VEH) systems . It reviews various applications of piezoelectric energ...