Due to the fundamental nature of exploration in rough-terrain, a rover accomplishing this task is naturally confronted with an unknown environment. It is especially true regarding its interaction with the soil, as the nature of it is uncertain. This work aims at creating a strategy allowing the rover to learn from its interaction with the terrains encountered, with the goal of optimizing its be...

Background: Prostate cancer is the second most common cancer in men worldwide and the third most common cancer in Iranian men. Chemotherapy is used to treat this cancer, but it has toxic effect. Natural compounds found in marine organisms and plants have anticancer considered. The aim of the present study was to investigate the effect of crab shell extract on induction of apoptosis in prostate ...

Plumb Beach, Brooklyn, New York in USA is an important horseshoe crab breeding and nursery ground that has experienced substantial anthropogenic influence, including pollution, erosion and subsequent restoration. Since little is known about the relationship between sediment microbial communities and juvenile horseshoe crab survival, next generation sequencing was used to characterize and compar...

For many astrophysical sources with jets, there is evidence for the contemporaneous presence of disks. In contrast, pulsars such as the Crab and Vela show jets but have not yet revealed direct evidence for accretion disks. Here we show that for such pulsars, an accretion disk radiating below detectable thresholds may simultaneously account for (1) observed deviations in the braking indices from...

there are many freshwater snails involved in the life cycle of parasitic flukes. some of these animals, such as bulinus spp and lymnaea spp are very important in public health and veterinary medicine. for example, bulinus trucatus and lymnaeid snails transmit human bilharziosis and zoonotic fascioliosis, respectively. for this reason most freshwater bodies of northern iran, were searched for po...

BACKGROUND Seafood processing workers have an increased risk of developing occupational asthma. This has not been studied among Norwegian crab processing workers, nor has the respiratory health of exposed workers been compared to a control group. OBJECTIVES Assessing the impact of working in the crab processing industry on workers' respiratory health. DESIGN A cross-sectional study of the r...

The willingness of the cephalopod mollusc Octopus vulgaris to attack a live crab is traditionally used as a method to assess the overall health and welfare of octopuses in the laboratory. This method requires placing a crab in the home tank of an animal, measuring the time (latency) taken for the octopus to initiate an attack and withdrawing the crab immediately prior to capture. The same crab ...

Transient low-oxygen patches may have important consequences for the population dynamics of estuarine species. We investigated whether these transient hypoxic patches altered population dynamics of the commercially important blue crab (Callinectes sapidus) and assessed two alternative hypotheses for the causal mechanism. One hypothesis is that temporary reductions in habitat due to hypoxia incr...