New York, Nov 20 (IANS) Extracts and isolated compounds from avocado seeds can potentially be used as a natural additive incorporated into ready-to-eat foods to control microbes that cause bacterial illness, researchers say.
The researchers found that the extracts from avocado seeds could be effective in controlling microbes that cause Listeria, a foodborne bacterial illness that can be very serious for pregnant women and people with impaired immune systems.
In the study, the researchers from Tecnologico de Monterrey, in Mexico compared enriched acetogenin extract (EAE) from avocado seeds with two name-brand synthetic antimicrobials.
They found that the EAE presented similar listeria-properties and chemical profiles to the synthetic antimicrobials.
The EAE was effective at 37 degrees celsius and at a refrigeration temperature of four degrees celsius.
Avocado seeds are a waste product of the food industry, and these results offer a value-added, sustainable opportunity for manufacturers, the researchers said.
Food products are usually formulated with synthetic additives that enhances the flavour so that it gives food a particular taste or smell. It may be derived from natural ingredients or created artificially.
However, food still has to be safe for consumers to eat, so food scientists are looking for ways to replace synthetic additives.
Since some additives are needed for food safety reasons, food product developers are faced with the challenge of developing more "natural" additives that can produce comparable results, the study said.
The study was published in the Journal of Food Science.
New York, Nov 20 (IANS) Scientists from the Netherlands said they have made an important advance towards creating a functional bioartificial kidney that could one day replace the need for dialysis or transplantation in the millions of patients with kidney failure.
"The strategies and methods of this work could be relevant to the development of other bioartificial organs, such as a bioartificial liver or bioartificial pancreas, and organs on chips -- such as a kidney on chip, a lung on chip, or a liver on chip," said Dimitrios Stamatialis, from the University of Twente in the Netherlands.
A key requirement for bioartificial kidney is the formation of a "living membrane" that consists of a tight kidney cell layer on artificial membrane surfaces and can transport molecules from one side to the other.
In a paper presented at American Society of Nephrology (ASN) Kidney Week 2016 at McCormick Place in Chicago, Illinois, the researchers achieved this using conditionally immortalised human renal proximal tubular epithelial cells (ciPTECs) on polyethersulfone-based hollow fiber membranes.
They demonstrated that the cell monolayer is indeed functional as a living membrane.
"This study shows the successful development of a living membrane consisting of a reproducible ciPTEC monolayer on hollow fiber membranes, an important step towards the development of a bioartificial kidney device," Stamatialis said.
New York, Nov 20 (IANS) In a breakthrough research, US scientists have identified that early signs of Alzheimer's disease can be detected by looking at the back of patients' eyes.
The researchers found that the retina tissue shows evidence of toxic tau and inflammation -- crucial for the onset of the neurodegenerative disease.
"Using the retina for detecting Alzheimer's disease and other neurodegenerative diseases would be non-invasive, inexpensive and could become a part of a normal screening done at patient checkups," said lead author Ashley Nilson, graduate student at The University of Texas Medical Branch at Galveston.
The study demonstrated that the toxic tau, which spreads between connected brain regions, may initiate inflammation in brain regions.
In Alzheimer's, the tau protein changes into a toxic form called tau oligomers and begins clumping into neurofibrillary tangles, which can leading to the eventual death of the brain cells.
"Our findings suggest that the degeneration of nerve cells due to chronic inflammation induced by the tau oligomers may be combated through the combination of anti-tau oligomer and anti-inflammatory therapeutics for the treatment of Alzheimer's and related diseases," added Rakez Kayed, Associate Professor at The University of Texas Medical Branch.
This situation can create a cycle of toxic tau, inflammation and cell death throughout the brain over time.
For the study, the team performed a systematic analyses of brain and retina samples from people with Alzheimer's and a mouse model of Alzheimer's.
"Early detection of Alzheimer's warning signs would allow for early intervention and prevention of neurodegeneration before major brain cell loss and cognitive decline occurs," Nilson said.
Beyond determining eye health and corrective lens prescriptions, having an eye exam can alert health care professionals of several different health conditions including diabetic complications, high cholesterol and high blood pressure, the researchers suggested, in the paper in the Journal of Alzheimer's Disease.
Thimphu, Nov 19 (IANS) Farmers and exporters in Bhutan's Phuentsholing town, on the border with India, have been hit hard as the demonetisation of high-value currency by India has led to cardamom and potato sales dropping drastically.
New York, Nov 19 (IANS) Increased sensitivity to uncertain threat, or fear of the unknown, is common to many anxiety disorders, including panic disorder, social anxiety disorder and specific phobias, says a study.
The finding could help steer treatment of these disorders away from diagnosis-based therapies to treating their common characteristics.
"Knowing that sensitivity to uncertain threat underlies all of the fear-based anxiety disorders also suggests that drugs that help specifically target this sensitivity could be used or developed to treat these disorders," said senior author on the study K. Luan Phan, Professor at the University of Illinois in Chicago.
"A treatment, or set of treatments, focused on sensitivity to uncertain threat could result in a more impactful and efficient way of treating a variety of anxiety disorders and symptoms," Stephanie Gorka from the University of Illinois College of Medicine, added.
Uncertain threat is unpredictable in its timing, intensity, frequency or duration and elicits a generalised feeling of apprehension and hypervigilance.
When a person is sensitive to uncertain threat, they can spend the entire day anxious and concerned that something bad could happen to them, Gorka said.
Panic disorder is one example -- patients are constantly anxious over the fact that they could have a panic attack at any moment, she said.
Predictable threat, on the other hand, produces a discreet fight-or-flight response that has a clear trigger and it abates once the threat has resolved.
For the study, the researchers looked at data from participants who underwent a task in two different studies performed at the University of Illinois at Chicago.
The two studies, of participants aged 18 to 65, included 25 participants with major depressive disorder; 29 with generalised anxiety disorder; 41 with social anxiety disorder; and 24 with a specific phobia.
Forty one control participants had no current or prior diagnoses of psychopathology.
The researchers measured the participants' eye-blink responses to predictable and unpredictable mild electric shocks to the wrist. To elicit blinking during the shock-task, the participants heard short, acoustic tones via headphones.
The study, published in the Journal of Abnormal Psychology, found that participants with social anxiety disorder or a specific phobia blinked much more strongly during the unpredictable shocks, when compared to participants without a mental health diagnosis.