Very slow development in two Antarctic bivalve molluscs, the infaunal clam Laternula elliptica and the scallop Adamussium colbecki

first_imgEmbryos of the large infaunal clam Laternula elliptica and the scallop Adamussium colbecki, from Antarctica, were cultured over an 18-month period. Their development rates were extremely slow, taking 240 and 177 h, respectively, to reach the trochophore stage. This is x4 to x18 slower than related clams and scallops from temperate latitudes. The relationship between temperature and development rate for bivalve molluscs shows the expected slowing with reduced temperature (Q(10) in the range 2-4) for temperate and tropical species. However, the slowing at polar latitudes is much stronger than at warmer waters, and all of the limited data for Antarctic species are well above the Arrhenius plot for the overall bivalve data, and the Q(10) value for Antarctic to cool temperate species is 11.8, well outside the expected range for biological systems. Either the relationships describing the effects of temperature on the kinetics of biological systems do not apply to Antarctic bivalve molluscs, or some other factor that cannot be compensated for becomes important at low temperature. In the laboratory, L. elliptica embryos stayed viable in very sticky egg capsules for up to 18 months without hatching. However, even the disturbance of removing eggs using a pipette ruptured some egg capsules allowing embryo release. Gametogenesis in Antarctic marine invertebrates is almost universally slowed compared to temperate species, with nearly all cases documented requiring more than 1 year to complete oogenesis. The only exception so far appears to be A. colbecki, which has a 1-year gametogenic cycle. The data here indicate that it has been unable to adapt embryonic development in a similar way, and we are not aware of any exceptions to the markedly slowed development at low temperature rule.last_img read more

What did we learn Thursday at 49ers HQ?

first_imgSANTA CLARA — George Kittle’s impressive season has impressed his 49ers teammates, so much so they voted the second-year tight end among their captains, a group that also includes Joe Staley, Richard Sherman, DeForest Buckner and Robbie Gould.“It starts with the way he plays and the way he comes to work every day,” Staley said of Kittle. “Obviously he has a ton of talent. … He plays the game the right way with a lot of passion.”Kittle leads the 49ers with 32 receptions for 527 yards, the …last_img read more

Yahoo! Issues Call for Homepage Apps, Plugs Proprietary Development Platform

first_imgYahoo! has made conscious and ever-increasing efforts to open themselves to the developer community in what many see as a struggle to remain interesting and viable in the age of the open API. Tools such as YQL, their proprietary query language which we covered in depth, and their YAP application development platform help to foster a sense of relevancy for the aging web giant. Top Reasons to Go With Managed WordPress Hosting jolie odell Related Posts Why Tech Companies Need Simpler Terms of Servic… Tags:#web#Yahoo A Web Developer’s New Best Friend is the AI Wai… 8 Best WordPress Hosting Solutions on the Market The Yahoo! Developer Network blog has a post today calling for “innovative and flawless” applications to be submitted for inclusion in a gallery section on their redesigned homepage.Apps are to be built using Yahoo!’s proprietary development platform, YAP. The YDN post further noted, “We’re working on an array of additional developer monetization opportunities – these will be available soon.” The gallery’s inaugural class includes YAP-built applications from Mint, Lumosity, Flixter, Target, and WordPress.The YAP premise is fairly straightforward. Styled “a wide open, self service environment,” the platform allows developers to build apps and submit them to Yahoo! with no business development deals or contracts. Developers use their own environments, stacks, and servers and code in any language they like. For the developers, the benefit is instant distribution. For Yahoo!, the benefit is a ton of free R&D and IP.For users, the benefit is a slew of widgets to make the Yahoo! portal more intensely personal, whether that experience is one of entertainment, education, practicality, socialization, or information. The apps pop into a lightbox-style layout, called “Small View,” on scrollover and go to a full-page “Canvas View” when a user clicks through.last_img read more

“Ladies Mapping Party” Strengthens Google’s Africa Maps

first_img8 Best WordPress Hosting Solutions on the Market If you like the idea of a quilting bee but prefer your bits electronic instead of fabric, you might be interested in a “ladies mapping party.” 70 Kenyan women were, and showed up to a Google-sponsored ladies mapping party at Nairobi’s iHub in February. The women used Google Map Maker, and their specific local knowledge, to fill in schools, health centers, market centers, community development projects, restaurants and roads in a country too often neglected by cartographers. Jacqueline Rajuai, Geo Specialist with Google, said the mix of women and the skills and knowledge they brought ranged widely. “The bigger aim of all this is to make the world’s information accessible, and also to make sure that we get more African content, and to make the internet useful and relevant for Africans.”Any readers involved in other crowdsourced mapping projects? Let us know in the comments. Why Tech Companies Need Simpler Terms of Servic… Top Reasons to Go With Managed WordPress Hosting Related Posts center_img Tags:#Google#Location#user-generated content#web curt hopkins A Web Developer’s New Best Friend is the AI Wai… “We had a mix of students, web developers, Non-profit CEOs, an advocate and even an editor. Their backgrounds were quite an interesting mix as we had Computer Science students and Geography students, participants with an environmental background but the common factor is that they had an interest to improve the Kenya maps. Either where they live, where they have projects or areas they frequent.”This is hardly the first time Google has invited people to an intensive mapping party. Not unlike the independent Map Kibera experiment, Google invited the inhabitants of Korogocho to put themselves on the map. A Pakistan project brought people together last year to map changes after that country’s horrific mudslides. Google is hardly a non-profit. All the information entered is available for further iterations of the company’s maps. However, Rajuai says this undertaking extends beyond making a profit. last_img read more

Jamaicans Urged to Make Healthier Food Choices

first_img “If we look at both obesity and overweight, some 51.7 per cent of Jamaicans 15 to 74 years old fall in that combined category. Obesity prevalence rates are highest in the 35- to 44 years old age group (and account for) 33 per cent,” he noted. With Jamaica’s obesity rates increasing by one per cent each year, the Minister of Health, Dr. the Hon. Christopher Tufton, is urging more Jamaicans to make healthier food choices. With Jamaica’s obesity rates increasing by one per cent each year, the Minister of Health, Dr. the Hon. Christopher Tufton, is urging more Jamaicans to make healthier food choices.Speaking at an obesity-prevention programme stakeholder meeting at the Spanish Court Hotel in New Kingston on January 16, Dr. Tufton said proactive steps such as reducing the levels of sugar consumption are critical in minimising obesity levels and other non-communicable diseases (NCDs) in the country.“This trend is astounding and clearly calls for bold and sustained corrective actions… . The evidence is clear that consumption of too many sweetened beverages is contributing to the global obesity crisis that we face as a country,” he said.Quoting statistics from the Jamaica Health and Lifestyle Survey, 2007/8, Dr. Tufton said 25.3 per cent of Jamaicans are obese.“If we look at both obesity and overweight, some 51.7 per cent of Jamaicans 15 to 74 years old fall in that combined category. Obesity prevalence rates are highest in the 35- to 44 years old age group (and account for) 33 per cent,” he noted.He said the survey further reveals that more females than males are overweight or obese. “Among the 15- to 74-year-olds, the study found that 37.7 per cent of females were obese versus just under 13 per cent of males. Additionally, approximately 70 per cent of females had increased waist circumferences versus 19.6 per cent males of the same age, in the 15-74 age group category,” he said.Dr. Tufton said there is a growing concern about the increase in childhood obesity, adding that children with obesity are very likely to remain obese as adults.He noted that obesity has increased in children aged 13 to 15 for both sexes over the period 2010 to 2017 by just under 70 per cent and overweight by 18 per cent.He added that in the 13 to 15 age group, more boys were obese than girls. “Many children today are growing up in an environment that promotes or encourages weight gain and obesity,” he argued.Dr. Tufton said the World Health Organization recommends that persons reduce their daily consumption of free sugar to less than 10 per cent or 12 teaspoons of their total energy intake. He noted that a further reduction to below five per cent or roughly 25 grams or six teaspoons per day would provide additional health benefits.He congratulated the Heart Foundation’s Global Health Advocacy Project for organising the sensitisation meeting, which aimed to raise awareness about obesity in Jamaica and measures to prevent it.The session sought to share information about the link between sugar intake and obesity and the role that policy can play in reducing sugar consumption and, by extension, obesity levels and other NCDs in Jamaica Story Highlights “This trend is astounding and clearly calls for bold and sustained corrective actions… . The evidence is clear that consumption of too many sweetened beverages is contributing to the global obesity crisis that we face as a country,” he said. last_img read more