Monthly Archives: July 2017

The origins of cats

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One of the cat skeletons excavated from a site in Egypt.

One of the cat skeletons excavated from a site in Egypt.{credit}© Hierakonpolis Expedition{/credit}

A new study reveals some fascinating insights into the origin story of the cat, arguably the internet’s most favorite creature and a cherished companion to countless humans.

Paleogeneticist Claudio Ottoni and his peers from KU Leuven and the Royal Belgian Institute of Natural Sciences have been collecting DNA from several archaeological sites in an attempt to track down the origins and trace the ancient journeys of the domestic cat.

The scientists unearthed over 200 cat skeletons from sites in Africa, Europe and the Near East and scrutinized DNA from feline skin, hair, bones and teeth that date back to between 100 and 9,000 years ago.

The result? A revelation about how cats dispersed in the ancient world. According to the study, the domestic cat we know today originated in ancient Egypt and the Near East.

Back then, the cats had stripes, not spots – the latter cropped up during the Middle Ages, but not before. The Middle Ages is also when the cat’s coat color had started to become variant.

The ancient felines were domesticated some 10,000 years ago, mostly by farmers wishing to chase away rodents from their fields. When the farmers moved, the cats moved with them. They also spread across the old world through trade, hopping on ships to protect stocks from vermin, and jumping from one port to the next, eventually covering long distances, and traveling far and wide. Now, the domestic cat is present on all continents except Antarctica.

The cats can all be traced back to one Felis silvestris, also known as the African wildcat, originally a feral, territorial and solitary hunter. Both the Near Eastern and Egyptian populations of Felis silvestris, according to the study, contributed to the gene pool of the domestic cat at different historical times.

 

Prescription drugs overused and abused in the Mideast

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It turns out that, in the Middle East, getting access to prescription medications for serious ailments, in the absence of supervision, can sometimes be as easy as picking up an over-the-counter medicine for a headache or the common cold, or so claims a new review published in Pharmacology Research & Perspectives.

In theory, the regulations separating access to either brand of medication is there. In practice, the review cites a “massive problem” of self-medication misuse in the region, particularly with prescription medication, one that eventually leads to greater health risks among patients, including drug dependency and addiction.

Drugs that are used recklessly or sometimes abused by Middle Eastern patients include codeine containing products, topical anesthetics, topical corticosteroids, antimalarial, and antibiotics. According to the review, which looked at 72 papers published on the subject between 1990 and 2015, self-medication medicine misuse cannot always be exactly quantified in the region but it seems widespread.

Some of the statistics that the review highlights are quite jarring.

For instance, 73.9% of the Sudanese population have reportedly used antibiotics or antimalarials without a prescription. Equally alarming trends have been observed in Syria, Yemen, Jordan, Tunisia, Egypt and the UAE, with drugs such as amoxicillin or ampicillin being dispensed freely. According to the review, most patients self-medicating on antibioitcs did not even follow through the full course of the medications and took them for less than three days.

Many of the patients follow the advice of relatives, or have a drug prescribed to them by a doctor over the phone. As well, some pharmacists play a role. “People tended to select medication based mainly on advice received from community pharmacists,” says one of the studies cited.

One study said that the majority of the 200 pharmacies under scrutiny in Syria had sold antibiotics without prescription, and in Saudi Arabia, only a single pharmacy had refused to release the medication without a doctor’s prescription.

As well as stacking prescription medications for future use, Middle Eastern patients often used them inappropriately; it’s not uncommon for many to pop antibiotics to treat illnesses unrelated to bacterial infections, for instance, or with incorrect dosages for inappropriate period of time, according to the review.

How global warming controls plankton populations

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A survey of the seas by the King Abdullah University of Science and Technology (KAUST), Saudi Arabia, has enabled scientists to come up with a predictive model of how planktonic heterotrophic prokaryotes – simple marine organisms that process most organic matter in the ocean – are affected by global warming.

Although small, plankton populations make up the largest living biomass in the ocean.

During an expedition in 2010, the scientists looked at plankton across subtropical and tropical waters of the Atlantic, Indian and Pacific Oceans. They scrutinized three factors: resource availability, mortality rates and temperature. They also looked at the viruses and microbes that either live off or kill off plankton.

Team leader Xose Anxelu G. Moran, associate professor of marine science at KAUST, and his peers from Saudi Arabia, Spain and Sweden, wanted to know what influenced plankton abundance and metabolism, and how this can help researchers predict the future role of the microbial populations in a changing ocean plagued by warmer temperatures and diminishing nutrients – thanks to climate change.

They found out that the effect of rising temperature on plankton is not uniform – populations living near the equator, for instance, are not as affected as those near the poles. The impact of global warming on marine microbes is more intense at higher latitudes, according to the study.

When there’s an abundance of viruses that eventually diminish the organism’s populations, temperature’s role becomes limited, the study adds. The same happens when there’s a decrease in nutrients; the water’s rising temperature almost becomes irrelevant. It’s why the scientists conclude that temperature only becomes a dominant factor when plankton are neither controlled by poor resources nor viral attacks.

As well, the study notes that a 1°C ocean warming will increase the biomass of plankton only in waters with more than 26°C of mean annual surface temperature.