BEIJING, September 8, 2016: An examination of the ornamental fish market in southern China has led to the discovery of a new species and even a new genus of freshwater crab, researchers have reported.
Knowing about the growing demand for eye-catching freshwater crabs from southern China, the authors took a look at the ornamental fish market to eventually identify an individual with unusually structured male gonopod, which in crustaceans is a swimming appendage modified to serve as a reproductive organ.
O hi there i am a new genus and species of crab found in a pet market
Having their interest drawn by the peculiar crab, study leads author Chao Huang from Sun Yat-sen University in China managed to persuade the fish dealer to let them survey the collection site located in Guangdong, southern China.
Despite the superficial resemblance to an already existing freshwater crab genus, at second glance, the crab turned out to be quite distinct thanks to a unique set of features including the carapace, the monopod and the relatively long and slender legs.
Once the molecular analyses’ results were also in, the authors had enough evidence to assign the freshwater crab as a species and even a genus new to science.
Being a primarily aquatic species, the new crab prefers the pools of limestone hill streams, therefore its name Yuebeipotamon calciatile, where calciatile means ‘living on limestone’.
To adapt to the habitat, the species seems to have developed its characteristic slender legs, which make it easier for the crab to climb and move around whenever the short-lived limestone hill streams make it search for a new home, the researchers reported in the journal ZooKeys.
The carapace of the new crab is usually coloured in maroon to dark brown, while the claws and legs are reddish to purplish, the study said. (IANS)
In order to fight novel coronavirus (COVID-19) pandemic, which has killed more than 16,000 people globally, Chinese researchers have found that lying face down is beneficial and improves breathing in severe cases of COVID-19.
The study, published in the American Journal of Respiratory and Critical Care Medicine, revealed that lying face down was better for the lungs in patients with severe COVID-19 (SARS-CoV-2) hospitalised on ventilators.
“This study is the first description of the behaviour of the lungs in patients with severe COVID-19 requiring mechanical ventilation and receiving positive pressure,” said study researcher Haibo Qiu from Southeast University in China.
“It indicates that some patients do not respond well to high positive pressure and respond better to prone positioning in bed (facing downward),” Qiu added. The retrospective study consisted of 12 patients in Wuhan Jinyintan Hospital in China, with severe COVID-19 infection-related acute respiratory distress syndrome (ARDS) who were assisted by mechanical ventilation.
A majority of patients admitted to the ICU with confirmed COVID-19 developed ARDS, the study said. According to the researchers, the observational study took place during a six-day period the week of February 18. The clinicians in Wuhan used an index, the Recruitment-to-Inflation ratio, that measures the response of lungs to pressure (lung recruit ability). According to the findings, the research team developed this index prior to this study.
The researchers assessed the effect of body positioning. Prone positioning was performed for 24-hour periods in which patients had persistently low levels of blood oxygenation. Oxygen flow, lung volume and airway pressure were measured by devices on patients’ ventilators. Other measurements were taken, including the aeration of their airway passages and calculations were done to measure recruit ability.
Seven patients received at least one session of prone positioning. Three patients received both prone positioning and ECMO (life support, replacing the function of heart and lungs). Three patients died, the researchers said.
Patients who did not receive prone positioning had poor lung recruit ability, while alternating supine (face upward) and prone positioning was associated with increased lung recruit ability, they added.
“It is only a small number of patients, but our study shows that many patients did not re-open their lungs under high positive pressure and may be exposed to more harm than benefit in trying to increase the pressure,” said study researcher Chun Pan, Professor with Zhongda Hospital.
“By contrast, the lung improves when the patient is in a prone position. Considering this can be done, it is important for the management of patients with severe COVID-19 requiring mechanical ventilation,” Pan added. (IANS)