The cellular energy sensor AMP-activated protein kinase (AMPK) is a metabolic regulator that mediates adaptation to nutritional variations to maintain a proper energy balance in cells. We show here that suckling-weaning and fasting-refeeding transitions in rodents are associated with changes in AMPK activation and the cellular energy state in the liver. These nutritional transitions were characterized by a metabolic switch from lipid to glucose utilization, orchestrated by modifications in glucose levels and the glucagon/insulin ratio in the bloodstream. We therefore investigated the respective roles of glucose and pancreatic hormones on AMPK activation in mouse primary hepatocytes. We found that glucose starvation transiently activates AMPK, whereas changes in glucagon and insulin levels had no impact on AMPK. Challenge of hepatocytes with metformin-induced metabolic stress strengthened both AMPK activation and cellular energy depletion under limited-glucose conditions, whereas neither glucagon nor insulin altered AMPK activation. Although both insulin and glucagon induced AMPKα phosphorylation at its Ser485/491 residue, they did not affect its activity. Finally, the decrease in cellular ATP levels in response to an energy stress was additionally exacerbated under fasting conditions and by AMPK deficiency in hepatocytes, revealing metabolic inflexibility and emphasizing the importance of AMPK for maintaining hepatic energy charge. Our results suggest that nutritional changes (i.e. glucose availability), rather than the related hormonal changes (i.e. the glucagon/insulin ratio), sensitize AMPK activation to the energetic stress induced by the dietary transition during fasting. This effect is critical for preserving the cellular energy state in the liver.

(Louisiana State University Health Sciences Center) A study conducted at LSU Health New Orleans has shown for the first time that chronic exposure to inhaled nicotine alone increases blood pressure in both the body's general circulation and in the lungs that can lead to pulmonary hypertension. The study also found that nicotine-induced pulmonary hypertension is accompanied by changes in the size, shape and function (remodeling) of the blood vessels in the lung and the right lower chamber of the heart.

(Geological Society of America) The annual meeting of The Geological Society of America's North-Central Section, originally scheduled to take place in Duluth, Minnesota, will be held virtually on May 18-19, 2020, with technical sessions in the morning and student programming in the afternoon. The online meeting is open and available to everyone for free. No registration is required.

(Arizona State University) Gary Moore, assistant professor in ASU's School of Molecular Sciences and the Biodesign Institute's Center for Applied Structural Discovery has just been named one of 14 young faculty nationwide to be honored with a 2020 Camille Dreyfus Teacher-Scholar Award by the Camille and Henry Dreyfus Foundation.

People living in units 13 and 14 of the top six floors of Heng Tai House in Fu Heng Estate, Tai Po need to be quarantined as a precaution.

Hong Kong University Chair of Infectious Disease Prof Yuen Kwok-yung made the statement at a media briefing today after an expert team conducted initial epidemiological investigations in the building to find the cause of a new COVID-19 infection.

The new case announced this afternoon involves a 59-year-old man who lives on the 34th floor of the building.

Prof Yuen said: “There is a possibility that when the patients on the 32nd floor are defecating - we know now that the fecal material actually contains the virus - while they’re defecating the fecal material goes into the sewer system.

“There is a vent of air that comes through the venting pipe, which goes to the top floor and maybe aerosolised in the air and then the droplets try to settle but, while at the same time, when there’s a light wind blowing, in which the air current going over the rooftop carries the particles back into the top floors.

“And of course, the 34th floor is the top floor. That is the most dangerous, followed by the 33rd and 32nd floors.”

Prof Yuen added he is uncertain if the venting pipe will continue to produce more infected aerosolised particles.

“So it is just a precautionary measure that we must remove the residents from the top six floors in units 13 and 14 for a period of time.”

For information and health advice on COVID-19, visit the Government's dedicated webpage.

The maximum monthly rental subsidy for each recycler under the One-off Rental Support Scheme will be increased from $25,000 to $37,500, the Environmental Protection Department announced today.

To help the recycling industry cope with the current economic situation and operational difficulties due to the COVID-19 epidemic, the Recycling Fund has allocated $50 million in additional funds to raise the scheme’s subsidy level.

The fund has now earmarked up to $250 million in total funding to fight the virus and help the recycling industry ride out difficult times.

On April 15, the Advisory Committee on Recycling Fund agreed to strengthen support under the scheme by increasing the rental assistance from 50% to 75% for the subsidy period from April to September.

The maximum monthly rental subsidy for each recycler will be increased to $37,500, while the maximum total rental subsidy for the 12 months will be increased from $300,000 to $375,000.

The scheme was launched last year to benefit about 500 street-corner recycling shops and 400 recycling sites.

In the face of current economic difficulties, the fund announced in February an extension of the subsidy period from six months to 12 months, lasting until September.     

As of April 9, the scheme has approved 103 applications, involving subsidies of more than $20 million.

The application deadline for the scheme is September 30. Enquiries can be made to 2788 5658 or via email.

Tenants of the EcoPark, country park refreshment kiosks and the Hong Kong Wetland Park will benefit from increased rental concessions for government premises.

To help tenants cope with the economic impact of the COVID-19 epidemic, rental concessions of government premises from April to September will be increased from 50% to 75%.

The Environment Bureau said tenants of the EcoPark, country park refreshment kiosks and the Hong Kong Wetland Park will receive additional rental concessions of about $3.6 million.

Together with the 50% rental concessions provided by the Government from last October to March, these tenants will receive concessions of more than $17 million within 12 months, the bureau said.

Meanwhile, tenants of the Hong Kong Wetland Park will receive a full rental waiver during the park’s closure.

The Hong Kong Special Administrative Region Government today welcomed the promulgation of the Meteorological Development Plan for the Guangdong-Hong Kong-Macao Greater Bay Area (2020-2035) by the China Meteorological Administration.

In a statement, the Hong Kong SAR Government said the promulgation of the plan would further strengthen meteorological co-operation among Guangdong, Hong Kong and Macau in areas such as data sharing, scientific research and innovation, and training of meteorological personnel.

Such co-operation would in turn enhance the meteorological services in the three places, it added.

The relevant co-operation initiatives will benefit the Hong Kong Observatory (HKO) in its development of fine-scale meteorological monitoring, warning and forecasting services, and will further enhance Hong Kong's capability in forecasting extreme weather events, the statement said, adding the HKO will take forward the initiatives in collaboration with the relevant authorities in Guangdong and Macau.

The full text of the meteorological plan is available on the China Meteorological Administration's website. It can also be accessed via the Hong Kong SAR Government's Greater Bay Area and HKO websites.

Vladimir Dragović and Irina Goryuchkina
Bull. Amer. Math. Soc. 57 (2020), 293-299.
Abstract, references and article information

Carlos Gustavo T. Moreira, Maria José Pacifico and Sergio Romaña Ibarra
Bull. Amer. Math. Soc. 57 (2018), 269-292.
Abstract, references and article information

Mozart once called the pipe organ the “king of instruments” and Hong Kong has musical royalty sitting in the heart of Tsim Sha Tsui.

It is hard to miss the pipe organ when you are inside the Cultural Centre Concert Hall. With its four manuals, 93 stops and 8,000 pipes, it can produce an exceptional array of timbre and volume.

“The pipe organ is the ‘pearl’ of a concert hall,” explained pipe organist Chiu Siu-ling.

“Its enormous range of sounds, coupled with a huge variety of tone colours, creates a remarkable musical experience equivalent to that of an orchestra. It is the king of instruments.”

Star performer

The four-storey tall pipe organ was hand-made by famed Austrian manufacturer Rieger Orgelbau and installed when the Cultural Centre was built 30 years ago. It has attracted several world-renowned performers to Hong Kong over the years.

“When we built it in 1989, it was the first, huge mechanically operated organ in Asia. I think it is still our biggest organ we have ever built in Asia,” Rieger pipe organ maintenance technician Gerhard Pohl said.

He added that the instrument is also remarkably versatile.

“There are many organs they are built just for one musical style. On this organ, you can play everything, even jazz music.”

Mr Pohl comes to Hong Kong once a year to give the 30-year-old organ its annual health check. In between visits by the manufacturer’s technicians, William Wen ensures the Cultural Centre’s star performer remains in tip-top condition.

Top tuner

Mr Wen is Hong Kong’s only pipe organ maintenance technician. He carries out routine checks on the instrument and tunes it every month.

“Keeping it in tune is my responsibility. I take care of it.”

Mr Wen was one of the first in Hong Kong to learn the instrument in the 1980s. He became interested in pipe organ maintenance after a visit to an organ manufacturing company in Europe.

He recalled that in the ‘80s, organists in Hong Kong were few and far between. He was called upon to test the Cultural Centre organ before the grand opening, making him one of the first organists to play it.

“It was dark in the hall, so at first, I only noticed the organ’s keys. When I got closer, I was astounded by just how big the instrument was.”

Mr Wen takes up to five hours per maintenance visit to thoroughly check the pipes and tune the organ. He explained that the organ is regularly updated and was fitted with an electrical coupler system, providing greater flexibility in switching between lighter and stronger key actions as desired by the player.

“It has been updated a few times. In 2010, the organ was installed with an electrical coupler system. I used to get someone to press the keys for me while I would tune it from inside. But now, I just need a mobile phone on which I can tune it by myself.”

Musical legacy

To promote organ music and nurture local organists, the Cultural Centre has been organising the “King of the Instruments” Pipe Organ Education Series annually since 1999. Now the programme’s principal instructor, Ms Chiu has been teaching from the outset.

“People are not allowed to touch the instrument in a lot of other concert halls, and they seldom hold pipe organ concerts. This is actually not good for the organ. It has to be played to keep it in good condition or the keys and parts will become hard and old. This inspires me teach and let more and more musicians learn and play the instrument,” Ms Chiu explained.

More than 300 organists have so far been trained on the Cultural Centre’s organ. But it has also played something other than music - it has played Cupid too.

Like-minded musicians

Pipe organist Simon Chan met his wife, Shirley Cheng, through the programme.

“I joined the Pipe Organ Education Series in 2000. After that, I continued learning the organ with Ms Chiu and eventually became one of the course tutors. I met my wife in 2003 on the course.”

Ms Cheng was also a student on the course. She switched majors from information technology to music and that fateful decision led to meeting her husband.

“He asked me to watch him play. He was playing a big piece which was powerful and loud, and that was when I fell for his charms.”

The couple decided to embark on a life journey together and now hope to pass on their love of music and the pipe organ to their children.

“I wish for my kids to learn music too and to find out more about the pipe organ. This instrument brought their father and mother together and I want them to know our story,” said Ms Cheng.

The organist-music teacher duo also hopes to share the joy of the pipe organ with the rest of the community.

The SAS Universal Viewer displays null values appropriately as blanks for XPT files. However, when you select Table ? Save As and save an XPT file as either an XML or CSV file, the SAS Universal Viewer con

SAS Visual Analytics can be configured to send a notification to specific users when report objects contain data that meets certain criteria. This SAS note contains frequently asked questions about setting up alerts.

Problems might occur when using SAS Enterprise Guide with dual monitors. For example, it might appear there is a performance problem with the query builder or other task, or it might appear that code or a task is hung, or

(Impact Journals LLC) Volume 11, Issue 18 of @Oncotarget Clinical implications of chromatin accessibility assessed by ATAC-seq profiling in human cancers especially in a large patient cohort is largely unknown.

(Center for Genomic Regulation) An analysis of 13,000 tumours highlights two previously overlooked genes as potential new therapeutic targets for cancer treatment. Researchers also identify potential new therapeutic targets for male infertility. Both findings are the result of the most comprehensive evolutionary analysis of RNA modification proteins to date, published today in the journal Genome Biology.