Connect with us

There are many different kinds of pollution. For example, light pollution in cities is what prevents you from seeing the stars at night. Meanwhile electromagnetic pollution may disorient birds and cause problems for our own electronics. Then there is air pollution, water pollution, soil pollution and so on, and so forth. But did you know that marine animals are suffering from acoustic pollution as well? Scientists at the University of Tasmania found that everyday marine noise from human activity can seriously harm lobsters.

Noise pollution is causing damage to lobsters

Spiny lobsters adapt to living in noisy environments, but still suffer from seismic air guns as well as ships and other sources of noise. Image credit: DrKjaergaard via Wikimedia (CC BY-SA 2.5)

Sound pollution is impacting everyone. Cities are never silent and it does affect both people and animals. But seas are not exactly quiet either. Ships are causing a lot of noise, as well as drilling platforms and various coastal activities. Scientists decided to see how sound pollution is affecting lobsters living close to a high-traffic shipping lane in Hobart. They compared them with lobsters that live in a quiet remote area and found that sound pollution is causing damage, which resembles damage caused by seismic air guns.

Previous studies have analyzed the damage done by  seismic exploration. It’s been determined that seismic air guns, used in search of oil and gas, are very dangerous for scallops, zooplankton and lobsters. But then again – seismic air guns can create noises that are very close to the loudest sounds humans can make. This new research shows that noise caused by shipping is not much better. Scientists were actually surprised to discover that a water pumping station and ships passing by can inflict similar levels of damage on spiny lobsters.

Dr Ryan Day, lead author of the study, said: “The lobsters from a noisy area that we studied suffered damage to their statocyst, an organ comparable to the human ear, which helps to control their position in the water, movement and righting reflex. The impact was comparable to that in lobsters exposed to air guns but, interestingly, their behaviour and righting reflex did not seem impaired, suggesting they had adapted to cope with their noisy environment”.

Seismic air guns create sharp, high-intensive signals, but that kind of noise is very short. Meanwhile ships and pumps create less intense, but a  continuous and lower frequency noise that pretty much never goes away. In the site of the study the noise level was 5-10 decibel greater than in the remote area. This is equivalent to 3-10 times higher noise intensity.

Noise pollution is real pollution. It is damaging the environment – intense man-made noises are damaging various wildlife forms. But so far it is difficult to imagine ways how marine noise pollution could be reduced. Maybe new engines and propellers will help.

 

Source: University of Tasmania




Source link

0
Continue Reading

Technology

How to install the FreeIPA identity and authorization solution on CentOS 8

centoshero

Jack Wallen walks you through the process of installing an identity and authorization platform on CentOS 8.

Image: CentOS

FreeIPA is an open source identity and authorization platform that provides centralized authorization for Linux, macOS, and Windows. This solution is based on the 389 Directory Server and uses Kerberos, SSSD, Dogtag, NTP, and DNS. The installation isn’t terribly challenging, and you’ll find a handy web-based interface that makes the platform easy to administer.

I’m going to walk you through the steps of getting FreeIPA up and running on CentOS 8. 

SEE: CentOS: A how-to guide (free PDF) (TechRepublic) 

What you’ll need

How to set your hostname

The first thing you must do is set your hostname. I’m going to be demonstrating with a LAN-only FQDN (which then must be mapped in /etc/hosts on any client machine that wants to access the server). 

Set your hostname with the command:

sudo hostnamectl set-hostname HOSTNAME

Where HOSTNAME is the FQDN of the server.

After you’ve set the hostname, you must add an entry in the server’s hosts file. Issue the command:

sudo nano /etc/hosts

Add a line at the bottom like this:

SERVER_IP HOSTNAME

Where SERVER_IP is the IP address of the server and HOSTNAME is the FQDN of the server.

Save and close the file.

How to install FreeIPA

The installation of FreeIPA starts with enabling the idm:DL1 repository with the command:

sudo module enable idm:DL1

When that command completes, sync the repository with the command:

sudo dnf distro-sync

Install FreeIPA with the command:

sudo dnf install ipa-server ipa-server-dns -y

How to set up FreeIPA Server

Next you have to run the configuration script for FreeIPA Server. To do that, issue the command:

sudo ipa-server-install

The first question you must answer is whether or not you want to install BIND for DNS. Accept the default (no) by pressing Enter on your keyboard. You must then confirm the domain and realm name, which will both be detected by the script. Once you’ve confirmed those entries, you’ll need to set a directory manager password, an IPA admin password for the web interface, and then accept the default (no) for the installation of chrony. 

After you’ve taken care of the above, you’ll be presented with the details of your installation (Figure A).

Figure A

freeipaa.jpg

The details of my installation of FreeIPA Server.

Type y and hit Enter on your keyboard. The configuration will begin. This does take a bit of time, so either sit back and watch the text fly by or set about to take care of another task.

When the configuration completes, you’re ready to continue on.

How to access the web interface

Open a browser and point it to https://SERVER_IP (where SERVER IP is the IP address of the hosting server). You should be prompted for a username and password (Figure B). The username is admin and the password is the one you set for IPA admin during the configuration. 

Figure B

freeipab.jpg

The FreeIPA login screen.

Upon successful login, you’ll find yourself at the FreeIPA main window, where you can begin managing your centralized authentication server (Figure C).

Figure C

freeipac.jpg

The FreeIPA main window is ready to work.

And that’s all there is to getting FreeIPA installed on CentOS. You can now spend some time adding users and other bits to make your identity and authorization solution work for your business.

Also see

Source link

0
Continue Reading

Technology

Targeting Aging is the Way to Treat Diseases of Aging

1 31

Near all work to date on the treatment of age-related disease has failed to consider or target underlying mechanisms of aging, the molecular damage that accumulates to cause pathology. It has instead involved one or another attempt to manipulate the complicated, disrrayed state of cellular metabolism in late stage disease, chasing proximate causes of pathology that are far downstream of the mechanisms of aging. This strategy has largely failed, and where it has succeeded has produced only modest benefits. Consider that statins, widely thought to be a major success in modern medicine, do no more than somewhat reduce and delay mortality due to atherosclerosis. They are not a cure. The mechanisms of aging are why age-related diseases such as atherosclerosis exist. They are the root cause of these diseases. Attempted therapies that continue to fail to target the mechanisms of aging will continue to fail to deliver meaningful benefits to patients. This must change.

Targeting Aging is the Way to Treat Diseases of Aging

Image credit: Pixabay (Free Pixabay license)

Aging doesn’t kill people – diseases kill people. Right? In today’s world, and in a country like the United States, most people die of diseases such as heart attack and stroke, cancer, and Alzheimer’s. These diseases tend to be complex, challenging, difficult, and extremely ugly to experience. And they are by nature chronic, caused by multifactorial triggers and predispositions and lifestyle choices. What we are only now beginning to understand is that the diseases that ultimately kill us are inseparable from the aging process itself. Aging is the root cause. This means that studying these diseases without taking aging into account could be dangerously misleading … and worst of all, impede real progress.

Take Alzheimer’s disease. To truly treat a disease like Alzheimer’s, we would need to identify and understand the biological targets and mechanisms that trigger the beginning of the disease, allowing us to intervene early – ideally, long before the onset of disease, to prevent any symptoms from happening. But in the case of diseases like Alzheimer’s, the huge problem is that we actually understand very little about those early targets and mechanisms. The biology underlying such diseases is incredibly complex. We aren’t sure what the cause is, we know for sure there isn’t only one target to hit, and all prior attempts to hit any targets at all have failed. When you start to think about how much of what we think we know about Alzheimer’s comes from very broken models – for example, mice, which don’t get Alzheimer’s naturally – it becomes totally obvious why we’re at a scientific stalemate in developing treatments for the disease, and that we’ve likely been coming at this from the wrong direction entirely.

The biggest risk factor for Alzheimer’s isn’t your APOE status; it’s your age. People in their twenties don’t get Alzheimer’s. But after you hit the age of 65, your risk of Alzheimer’s doubles every five years, with your risk reaching nearly one out of three by the time you’re 85. What if going after this one biggest risk factor is the best vector of attack? Maybe even the only way to truly address it? This isn’t about the vanity of staying younger, about holding on to your good looks or your ability to run an 8 minute mile. It’s about the only concrete possibility we have to cure these diseases. Instead of choosing targets for a single specific disease, i.e. a specific condition that arises in conjunction with aging, we can get out in front of disease by choosing targets that promote health. And we can identify these by looking at disease through the lens of the biology of aging.

Link: https://a16z.com/2020/10/07/aging-alzheimers-drug-discovery/

Source: Fight Aging!




Source link

0
Continue Reading

Technology

The Mandalorian Season 1 Recap Distills the Star Wars Series Into 89 Seconds

mandalorian season 1 1603956532089

Before The Mandalorian season 2 premieres Friday afternoon on Disney+ Hotstar (and Friday midnight on Disney+ in the US), Disney and Lucasfilm have given us an official 89-second recap of The Mandalorian season 1. That’s very brief, but it speaks to the fact that The Mandalorian wasn’t a narratively-heavy show on its debut last year.

Everything You Need to Know About The Mandalorian Season 2

The Mandalorian season 1 recap touches upon Mando’s (Pedro Pascal) profession (he’s a bounty hunter), his newest target (Baby Yoda), the people he meets along the way — Cara Dune (Gina Carano), Greef Karga (Carl Weathers), and Kuiil (voiced by Nick Nolte) — and the consequences of his decision to bring Baby Yoda under his wing.

“You have something I want. It means more to me than you will ever know,” the darksaber-wielding villain Moff Gideon (Giancarlo Esposito) says deep into The Mandalorian season 1 recap, as we are given a reminder of the Star Wars series’ action-heavy side. Gideon then declares: “It will be mine.”

The season 1 recap wraps by setting up The Mandalorian season 2, as tribe leader The Armorer (Emily Swallow) instructs Mando to reunite Baby Yoda “with its own kind”. Mando wonders: “You expect me to search the galaxy for the home of this creature?” Well, yes, otherwise what would we do in season 2, Mando.

In addition to Pascal, Carano, Weathers, and Esposito, The Mandalorian season 2 also stars Omid Abtahi as Dr. Pershing, Horatio Sanz as Mythrol, Rosario Dawson as Ahsoka Tano, Katee Sackhoff as Bo-Katan Kryze, Temuera Morrison as Boba Fett, Timothy Olyphant as former slave Cobb Vanth, Michael Biehn as a rival bounty hunter, and Sasha Banks in an undisclosed role.

Jon Favreau (The Lion King, Iron Man) created The Mandalorian and serves as showrunner and head writer on the Star Wars series. Favreau and Weathers are among the directors on season 2 alongside Dave Filoni, Rick Famuyiwa, Bryce Dallas Howard, Peyton Reed, and Robert Rodriguez.

The Mandalorian season 2 premieres October 30 on Disney+ Hotstar in India. Episodes will air weekly.

Source link

0
Continue Reading

Trending