journal
https://read.qxmd.com/read/36454863/gradual-emergence-followed-by-exponential-spread-of-the-sars-cov-2-omicron-variant-in-africa
#1
JOURNAL ARTICLE
Carlo Fischer, Tongai Gibson Maponga, Anges Yadouleton, Nuro Abílio, Emmanuel Aboce, Praise Adewumi, Pedro Afonso, Jewelna Akorli, Soa Fy Andriamandimby, Latifa Anga, Yvonne Ashong, Mohamed Amine Beloufa, Aicha Bensalem, Richard Birtles, Anicet Luc Magloire Boumba, Freddie Bwanga, Mike Chaponda, Paradzai Chibukira, R Matthew Chico, Justin Chileshe, Gershom Chongwe, Assana Cissé, Umberto D'Alessandro, Xavier Nicolas de Lamballerie, Joana F M de Morais, Fawzi Derrar, Ndongo Dia, Youssouf Diarra, Lassina Doumbia, Christian Drosten, Philippe Dussart, Richard Echodu, Yannik Eggers, Abdelmajid Eloualid, Ousmane Faye, Torsten Feldt, Anna Frühauf, Afiwa Halatoko, Pauliana-Vanessa Ilouga, Nalia Ismael, Ronan Jambou, Sheikh Jarju, Antje Kamprad, Ben Katowa, John Kayiwa, Leonard King'wara, Ousmane Koita, Vincent Lacoste, Adamou Lagare, Olfert Landt, Sonia Etenna Lekana-Douki, Jean-Bernard Lekana-Douki, Etuhole Iipumbu, Hugues Loemba, Julius Lutwama, Santou Mamadou, Issaka Maman, Brendon Manyisa, Pedro A Martinez, Japhet Matoba, Lusia Mhuulu, Andres Moreira-Soto, Judy Mwangi, Nadine N Dilimabaka, Charity Angella Nassuna, Mamadou Ousmane Ndiath, Emmanuel Nepolo, Richard Njouom, Jalal Nourlil, Steven Ger Nyanjom, Eddy Okoth Odari, Alfred Okeng, Jean Bienvenue Ouoba, Michael Owusu, Irene Owusu Donkor, Karabo Kristen Phadu, Richard Odame Phillips, Wolfgang Preiser, Vurayai Ruhanya, Fortune Salah, Sourakatou Salifou, Amadou Alpha Sall, Augustina Angelina Sylverken, Paul Alain Tagnouokam-Ngoupo, Zekiba Tarnagda, Francis Olivier Tchikaya, Tafese Beyene Tufa, Jan Felix Drexler
The geographic and evolutionary origins of the SARS-CoV-2 Omicron variant (BA.1), which was first detected mid-November 2021 in Southern Africa, remain unknown. We tested 13,097 COVID-19 patients sampled between mid-2021 to early 2022 from 22 African countries for BA.1 by real-time RT-PCR. By November-December 2021, BA.1 had replaced the Delta variant in all African sub-regions following a South-North gradient, with a peak Rt of 4.1. Polymerase chain reaction and near-full genome sequencing data revealed genetically diverse Omicron ancestors already existed across Africa by August 2021...
December 1, 2022: Science
https://read.qxmd.com/read/36423263/zygotic-genome-activation-by-the-totipotency-pioneer-factor-nr5a2
#2
JOURNAL ARTICLE
Johanna Gassler, Wataru Kobayashi, Imre Gáspár, Siwat Ruangroengkulrith, Adarsh Mohanan, Laura Gómez Hernández, Pavel Kravchenko, Maximilian Kümmecke, Aleksandar Lalic, Nikita Rifel, Robert John Ashburn, Maciej Zaczek, Antoine Vallot, Laura Cuenca Rico, Sabrina Ladstätter, Kikuë Tachibana
Life begins with a switch in genetic control from the maternal to the embryonic genome during zygotic genome activation (ZGA). Despite its importance, the essential regulators of ZGA remain largely unknown in mammals. Based on de novo motif searches, we identified the orphan nuclear receptor Nr5a2 as a key activator of major ZGA in mouse 2-cell embryos. Nr5a2 is required for progression beyond the 2-cell stage. It binds to its motif within SINE B1/Alu retrotransposable elements found in cis -regulatory regions of ZGA genes...
November 24, 2022: Science
https://read.qxmd.com/read/36417498/aqueous-alteration-processes-in-jezero-crater-mars-implications-for-organic-geochemistry
#3
JOURNAL ARTICLE
Eva L Scheller, Joseph Razzell Hollis, Emily L Cardarelli, Andrew Steele, Luther W Beegle, Rohit Bhartia, Pamela Conrad, Kyle Uckert, Sunanda Sharma, Bethany L Ehlmann, William J Abbey, Sanford A Asher, Kathleen C Benison, Eve L Berger, Olivier Beyssac, Benjamin L Bleefeld, Tanja Bosak, Adrian J Brown, Aaron S Burton, Sergei V Bykov, Ed Cloutis, Alberto G Fairén, Lauren DeFlores, Kenneth A Farley, Deidra M Fey, Teresa Fornaro, Allison C Fox, Marc Fries, Keyron Hickman-Lewis, William F Hug, Joshua E Huggett, Samara Imbeah, Ryan S Jakubek, Linda C Kah, Peter Kelemen, Megan R Kennedy, Tanya Kizovski, Carina Lee, Yang Liu, Lucia Mandon, Francis M McCubbin, Kelsey R Moore, Brian E Nixon, Jorge I Núñez, Carolina Rodriguez Sanchez-Vahamonde, Ryan D Roppel, Mitchell Schulte, Mark A Sephton, Shiv K Sharma, Sandra Siljeström, Svetlana Shkolyar, David L Shuster, Justin I Simon, Rebecca J Smith, Kathryn M Stack, Kim Steadman, Benjamin P Weiss, Alyssa Werynski, Amy J Williams, Roger C Wiens, Kenneth H Williford, Kathrine Winchell, Brittan Wogsland, Anastasia Yanchilina, Rachel Yingling, Maria-Paz Zorzano
The Perseverance rover landed in Jezero crater, Mars in February 2021. We used the Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) instrument to perform deep ultraviolet Raman and fluorescence spectroscopy of three rocks within the crater. We identify evidence for two distinct ancient aqueous environments at different times. Reactions with liquid water formed carbonates in an olivine-rich igneous rock. A sulfate-perchlorate mixture is present in the rocks, probably formed by later modifications of the rocks by brine...
November 23, 2022: Science
https://read.qxmd.com/read/36413172/human-level-play-in-the-game-of-diplomacy-by-combining-language-models-with-strategic-reasoning
#4
JOURNAL ARTICLE
Anton Bakhtin, Noam Brown, Emily Dinan, Gabriele Farina, Colin Flaherty, Daniel Fried, Andrew Goff, Jonathan Gray, Hengyuan Hu, Athul Paul Jacob, Mojtaba Komeili, Karthik Konath, Minae Kwon, Adam Lerer, Mike Lewis, Alexander H Miller, Sasha Mitts, Adithya Renduchintala, Stephen Roller, Dirk Rowe, Weiyan Shi, Joe Spisak, Alexander Wei, David Wu, Hugh Zhang, Markus Zijlstra
Despite much progress in training AI systems to imitate human language, building agents that use language to communicate intentionally with humans in interactive environments remains a major challenge. We introduce Cicero, the first AI agent to achieve human-level performance in Diplomacy , a strategy game involving both cooperation and competition that emphasizes natural language negotiation and tactical coordination between seven players. Cicero integrates a language model with planning and reinforcement learning algorithms by inferring players' beliefs and intentions from its conversations and generating dialogue in pursuit of its plans...
November 22, 2022: Science
https://read.qxmd.com/read/36413140/editorial-expression-of-concern
#5
JOURNAL ARTICLE
H Holden Thorp
No abstract text is available yet for this article.
November 22, 2022: Science
https://read.qxmd.com/read/36395272/fairness-considerations-in-global-mitigation-investments
#6
JOURNAL ARTICLE
Shonali Pachauri, Setu Pelz, Christoph Bertram, Silvie Kreibiehl, Narasimha D Rao, Youba Sokona, Keywan Riahi
Current mitigation finance flows are inadequate and unfair.
November 17, 2022: Science
https://read.qxmd.com/read/36264829/imprinted-antibody-responses-against-sars-cov-2-omicron-sublineages
#7
JOURNAL ARTICLE
Young-Jun Park, Dora Pinto, Alexandra C Walls, Zhuoming Liu, Anna De Marco, Fabio Benigni, Fabrizia Zatta, Chiara Silacci-Fregni, Jessica Bassi, Kaitlin R Sprouse, Amin Addetia, John E Bowen, Cameron Stewart, Martina Giurdanella, Christian Saliba, Barbara Guarino, Michael A Schmid, Nicholas M Franko, Jennifer K Logue, Ha V Dang, Kevin Hauser, Julia di Iulio, William Rivera, Gretja Schnell, Anushka Rajesh, Jiayi Zhou, Nisar Farhat, Hannah Kaiser, Martin Montiel-Ruiz, Julia Noack, Florian A Lempp, Javier Janer, Rana Abdelnabi, Piet Maes, Paolo Ferrari, Alessandro Ceschi, Olivier Giannini, Guilherme Dias de Melo, Lauriane Kergoat, Hervé Bourhy, Johan Neyts, Leah Soriaga, Lisa A Purcell, Gyorgy Snell, Sean P J Whelan, Antonio Lanzavecchia, Herbert W Virgin, Luca Piccoli, Helen Y Chu, Matteo Samuele Pizzuto, Davide Corti, David Veesler
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron sublineages carry distinct spike mutations and represent an antigenic shift resulting in escape from antibodies induced by previous infection or vaccination. We show that hybrid immunity or vaccine boosters elicit plasma neutralizing activity against Omicron BA.1, BA.2, BA.2.12.1 and BA.4/5 and that breakthrough infections, but not vaccination-only, induce neutralizing activity in the nasal mucosa. Consistent with immunological imprinting, most antibodies derived from memory B cells or plasma cells of Omicron breakthrough cases cross-react with the Wuhan-Hu-1, BA...
October 20, 2022: Science
https://read.qxmd.com/read/36264828/noble-gases-and-nitrogen-in-samples-of-asteroid-ryugu-record-its-volatile-sources-and-recent-surface-evolution
#8
JOURNAL ARTICLE
Ryuji Okazaki, Bernard Marty, Henner Busemann, Ko Hashizume, Jamie D Gilmour, Alex Meshik, Toru Yada, Fumio Kitajima, Michael W Broadley, David Byrne, Evelyn Füri, My E I Riebe, Daniela Krietsch, Colin Maden, Akizumi Ishida, Patricia Clay, Sarah A Crowther, Lydia Fawcett, Thomas Lawton, Olga Pravdivtseva, Yayoi N Miura, Jisun Park, Ken-Ichi Bajo, Yoshinori Takano, Keita Yamada, Shinsuke Kawagucci, Yohei Matsui, Mizuki Yamamoto, Kevin Righter, Saburo Sakai, Naoyoshi Iwata, Naoki Shirai, Shun Sekimoto, Makoto Inagaki, Mitsuru Ebihara, Reika Yokochi, Kunihiko Nishiizumi, Keisuke Nagao, Jong Ik Lee, Akihiro Kano, Marc W Caffee, Ryu Uemura, Tomoki Nakamura, Hiroshi Naraoka, Takaaki Noguchi, Hikaru Yabuta, Hisayoshi Yurimoto, Shogo Tachibana, Hirotaka Sawada, Kanako Sakamoto, Masanao Abe, Masahiko Arakawa, Atsushi Fujii, Masahiko Hayakawa, Naoyuki Hirata, Naru Hirata, Rie Honda, Chikatoshi Honda, Satoshi Hosoda, Yu-Ichi Iijima, Hitoshi Ikeda, Masateru Ishiguro, Yoshiaki Ishihara, Takahiro Iwata, Kosuke Kawahara, Shota Kikuchi, Kohei Kitazato, Koji Matsumoto, Moe Matsuoka, Tatsuhiro Michikami, Yuya Mimasu, Akira Miura, Tomokatsu Morota, Satoru Nakazawa, Noriyuki Namiki, Hirotomo Noda, Rina Noguchi, Naoko Ogawa, Kazunori Ogawa, Tatsuaki Okada, Chisato Okamoto, Go Ono, Masanobu Ozaki, Takanao Saiki, Naoya Sakatani, Hiroki Senshu, Yuri Shimaki, Kei Shirai, Seiji Sugita, Yuto Takei, Hiroshi Takeuchi, Satoshi Tanaka, Eri Tatsumi, Fuyuto Terui, Ryudo Tsukizaki, Koji Wada, Manabu Yamada, Tetsuya Yamada, Yukio Yamamoto, Hajime Yano, Yasuhiro Yokota, Keisuke Yoshihara, Makoto Yoshikawa, Kent Yoshikawa, Shizuho Furuya, Kentaro Hatakeda, Tasuku Hayashi, Yuya Hitomi, Kazuya Kumagai, Akiko Miyazaki, Aiko Nakato, Masahiro Nishimura, Hiromichi Soejima, Ayako Iwamae, Daiki Yamamoto, Kasumi Yogata, Miwa Yoshitake, Ryota Fukai, Tomohiro Usui, Harold C Connolly, Dante Lauretta, Sei-Ichiro Watanabe, Yuichi Tsuda
The near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth's volatiles. Samples of Ryugu were retrieved by the Hayabusa2 spacecraft. We measure noble gas and nitrogen isotopes in Ryugu samples, finding they are dominated by pre-solar and primordial components, incorporated during Solar System formation. Noble gas concentrations are higher than those in Ivuna-type carbonaceous (CI) chondrite meteorites. Several host phases of isotopically distinct nitrogen have heterogeneous abundances between the samples...
October 20, 2022: Science
https://read.qxmd.com/read/36264827/refactored-genetic-codes-enable-bidirectional-genetic-isolation
#9
JOURNAL ARTICLE
Jérôme F Zürcher, Wesley E Robertson, Tomás Kappes, Gianluca Petris, Thomas S Elliott, George P C Salmond, Jason W Chin
The near-universal genetic code defines the correspondence between codons in genes and amino acids in proteins. Here we refactored the structure of the genetic code in Escherichia coli and created orthogonal genetic codes which restrict the escape of synthetic genetic information into natural life. We developed orthogonal, and mutually orthogonal, horizontal gene transfer systems, which permit the transfer of genetic information between organisms that use the same genetic code, but restrict transfer of genetic information between organisms that use different genetic codes...
October 20, 2022: Science
https://read.qxmd.com/read/36264826/protect-global-values-of-the-southern-ocean-ecosystem
#10
JOURNAL ARTICLE
Cassandra M Brooks, David G Ainley, Jennifer Jacquet, Steven L Chown, Luis R Pertierra, Elizabeth Francis, Alex Rogers, Vasco Chavez-Molina, Louise Teh, U Rashid Sumaila
Climate change and fishing present dual threats.
October 20, 2022: Science
https://read.qxmd.com/read/36264825/multiple-lineages-of-monkeypox-virus-detected-in-the-united-states-2021-2022
#11
JOURNAL ARTICLE
Crystal M Gigante, Bette Korber, Matthew H Seabolt, Kimberly Wilkins, Whitni Davidson, Agam K Rao, Hui Zhao, Todd G Smith, Christine M Hughes, Faisal Minhaj, Michelle A Waltenburg, James Theiler, Sandra Smole, Glen R Gallagher, David Blythe, Robert Myers, Joann Schulte, Joey Stringer, Philip Lee, Rafael M Mendoza, LaToya A Griffin-Thomas, Jenny Crain, Jade Murray, Annette Atkinson, Anthony H Gonzalez, June Nash, Dhwani Batra, Inger Damon, Jennifer McQuiston, Christina L Hutson, Andrea M McCollum, Yu Li
Monkeypox is a viral zoonotic disease endemic in Central and West Africa. In May 2022, dozens of non-endemic countries reported hundreds of monkeypox cases, most with no epidemiological link to Africa. We identified two lineages of monkeypox virus (MPXV) among two 2021 and seven 2022 U.S. monkeypox cases: the major 2022 outbreak variant, B.1, and a minor contemporaneously sampled variant called A.2. Analyses of mutations among these two variants revealed an extreme preference for GA-to-AA mutations indicative of human APOBEC3 cytosine deaminase activity among Clade IIb MPXV (previously West African, Nigeria) sampled since 2017...
October 20, 2022: Science
https://read.qxmd.com/read/36228020/remember-do-no-harm
#12
EDITORIAL
H Holden Thorp
No abstract text is available yet for this article.
October 13, 2022: Science
https://read.qxmd.com/read/36228019/mandatory-disclosure-is-key-to-address-climate-risks
#13
JOURNAL ARTICLE
Stefano Carattini, Edgar Hertwich, Givi Melkadze, Jeffrey G Shrader
Financial regulations would help signal risks to investors.
October 13, 2022: Science
https://read.qxmd.com/read/36205582/stop-passing-the-buck-on-intro-science
#14
EDITORIAL
H Holden Thorp
No abstract text is available yet for this article.
October 7, 2022: Science
https://read.qxmd.com/read/36137054/heavy-tailed-sexual-contact-networks-and-monkeypox-epidemiology-in-the-global-outbreak-2022
#15
JOURNAL ARTICLE
Akira Endo, Hiroaki Murayama, Sam Abbott, Ruwan Ratnayake, Carl A B Pearson, W John Edmunds, Elizabeth Fearon, Sebastian Funk
No abstract text is available yet for this article.
September 22, 2022: Science
https://read.qxmd.com/read/36137011/formation-and-evolution-of-carbonaceous-asteroid-ryugu-direct-evidence-from-returned-samples
#16
JOURNAL ARTICLE
T Nakamura, M Matsumoto, K Amano, Y Enokido, M E Zolensky, T Mikouchi, H Genda, S Tanaka, M Y Zolotov, K Kurosawa, S Wakita, R Hyodo, H Nagano, D Nakashima, Y Takahashi, Y Fujioka, M Kikuiri, E Kagawa, M Matsuoka, A J Brearley, A Tsuchiyama, M Uesugi, J Matsuno, Y Kimura, M Sato, R E Milliken, E Tatsumi, S Sugita, T Hiroi, K Kitazato, D Brownlee, D J Joswiak, M Takahashi, K Ninomiya, T Takahashi, T Osawa, K Terada, F E Brenker, B J Tkalcec, L Vincze, R Brunetto, A Aléon-Toppani, Q H S Chan, M Roskosz, J-C Viennet, P Beck, E E Alp, T Michikami, Y Nagaashi, T Tsuji, Y Ino, J Martinez, J Han, A Dolocan, R J Bodnar, M Tanaka, H Yoshida, K Sugiyama, A J King, K Fukushi, H Suga, S Yamashita, T Kawai, K Inoue, A Nakato, T Noguchi, F Vilas, A R Hendrix, C Jaramillo-Correa, D L Domingue, G Dominguez, Z Gainsforth, C Engrand, J Duprat, S S Russell, E Bonato, C Ma, T Kawamoto, T Wada, S Watanabe, R Endo, S Enju, L Riu, S Rubino, P Tack, S Takeshita, Y Takeichi, A Takeuchi, A Takigawa, D Takir, T Tanigaki, A Taniguchi, K Tsukamoto, T Yagi, S Yamada, K Yamamoto, Y Yamashita, M Yasutake, K Uesugi, I Umegaki, I Chiu, T Ishizaki, S Okumura, E Palomba, C Pilorget, S M Potin, A Alasli, S Anada, Y Araki, N Sakatani, C Schultz, O Sekizawa, S D Sitzman, K Sugiura, M Sun, E Dartois, E De Pauw, Z Dionnet, Z Djouadi, G Falkenberg, R Fujita, T Fukuma, I R Gearba, K Hagiya, M Y Hu, T Kato, T Kawamura, M Kimura, M K Kubo, F Langenhorst, C Lantz, B Lavina, M Lindner, J Zhao, B Vekemans, D Baklouti, B Bazi, F Borondics, S Nagasawa, G Nishiyama, K Nitta, J Mathurin, T Matsumoto, I Mitsukawa, H Miura, A Miyake, Y Miyake, H Yurimoto, R Okazaki, H Yabuta, H Naraoka, K Sakamoto, S Tachibana, H C Connolly, D S Lauretta, M Yoshitake, M Yoshikawa, K Yoshikawa, K Yoshihara, Y Yokota, K Yogata, H Yano, Y Yamamoto, D Yamamoto, M Yamada, T Yamada, T Yada, K Wada, T Usui, R Tsukizaki, F Terui, H Takeuchi, Y Takei, A Iwamae, H Soejima, K Shirai, Y Shimaki, H Senshu, H Sawada, T Saiki, M Ozaki, G Ono, T Okada, N Ogawa, K Ogawa, R Noguchi, H Noda, M Nishimura, N Namiki, S Nakazawa, T Morota, A Miyazaki, A Miura, Y Mimasu, K Matsumoto, K Kumagai, T Kouyama, S Kikuchi, K Kawahara, S Kameda, T Iwata, Y Ishihara, M Ishiguro, H Ikeda, S Hosoda, R Honda, C Honda, Y Hitomi, N Hirata, N Hirata, T Hayashi, M Hayakawa, K Hatakeda, S Furuya, R Fukai, A Fujii, Y Cho, M Arakawa, M Abe, S Watanabe, Y Tsuda
Samples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed seventeen Ryugu samples measuring 1-8 mm. CO2 -bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent asteroid formed in the outer Solar System. The samples contain low abundances of materials that formed at high temperatures, such as chondrules and Ca, Al-rich inclusions. The samples are rich in phyllosilicates and carbonates, which formed by aqueous alteration reactions at low temperature, high pH, and water/rock ratios < 1 (by mass)...
September 22, 2022: Science
https://read.qxmd.com/read/36108049/the-evolving-sars-cov-2-epidemic-in-africa-insights-from-rapidly-expanding-genomic-surveillance
#17
JOURNAL ARTICLE
Houriiyah Tegally, James E San, Matthew Cotten, Monika Moir, Bryan Tegomoh, Gerald Mboowa, Darren P Martin, Cheryl Baxter, Arnold W Lambisia, Amadou Diallo, Daniel G Amoako, Moussa M Diagne, Abay Sisay, Abdel-Rahman N Zekri, Abdou Salam Gueye, Abdoul K Sangare, Abdoul-Salam Ouedraogo, Abdourahmane Sow, Abdualmoniem O Musa, Abdul K Sesay, Abe G Abias, Adam I Elzagheid, Adamou Lagare, Adedotun-Sulaiman Kemi, Aden Elmi Abar, Adeniji A Johnson, Adeola Fowotade, Adeyemi O Oluwapelumi, Adrienne A Amuri, Agnes Juru, Ahmed Kandeil, Ahmed Mostafa, Ahmed Rebai, Ahmed Sayed, Akano Kazeem, Aladje Balde, Alan Christoffels, Alexander J Trotter, Allan Campbell, Alpha K Keita, Amadou Kone, Amal Bouzid, Amal Souissi, Ambrose Agweyu, Amel Naguib, Ana V Gutierrez, Anatole Nkeshimana, Andrew J Page, Anges Yadouleton, Anika Vinze, Anise N Happi, Anissa Chouikha, Arash Iranzadeh, Arisha Maharaj, Armel L Batchi-Bouyou, Arshad Ismail, Augustina A Sylverken, Augustine Goba, Ayoade Femi, Ayotunde E Sijuwola, Baba Marycelin, Babatunde L Salako, Bamidele S Oderinde, Bankole Bolajoko, Bassirou Diarra, Belinda L Herring, Benjamin Tsofa, Bernard Lekana-Douki, Bernard Mvula, Berthe-Marie Njanpop-Lafourcade, Blessing T Marondera, Bouh Abdi Khaireh, Bourema Kouriba, Bright Adu, Brigitte Pool, Bronwyn McInnis, Cara Brook, Carolyn Williamson, Cassien Nduwimana, Catherine Anscombe, Catherine B Pratt, Cathrine Scheepers, Chantal G Akoua-Koffi, Charles N Agoti, Chastel M Mapanguy, Cheikh Loucoubar, Chika K Onwuamah, Chikwe Ihekweazu, Christian N Malaka, Christophe Peyrefitte, Chukwa Grace, Chukwuma E Omoruyi, Clotaire D Rafaï, Collins M Morang'a, Cyril Erameh, Daniel B Lule, Daniel J Bridges, Daniel Mukadi-Bamuleka, Danny Park, David A Rasmussen, David Baker, David J Nokes, Deogratius Ssemwanga, Derek Tshiabuila, Dominic S Y Amuzu, Dominique Goedhals, Donald S Grant, Donwilliams O Omuoyo, Dorcas Maruapula, Dorcas W Wanjohi, Ebenezer Foster-Nyarko, Eddy K Lusamaki, Edgar Simulundu, Edidah M Ong'era, Edith N Ngabana, Edward O Abworo, Edward Otieno, Edwin Shumba, Edwine Barasa, El Bara Ahmed, Elhadi A Ahmed, Emmanuel Lokilo, Enatha Mukantwari, Eromon Philomena, Essia Belarbi, Etienne Simon-Loriere, Etilé A Anoh, Eusebio Manuel, Fabian Leendertz, Fahn M Taweh, Fares Wasfi, Fatma Abdelmoula, Faustinos T Takawira, Fawzi Derrar, Fehintola V Ajogbasile, Florette Treurnicht, Folarin Onikepe, Francine Ntoumi, Francisca M Muyembe, Frank E Z Ragomzingba, Fred A Dratibi, Fred-Akintunwa Iyanu, Gabriel K Mbunsu, Gaetan Thilliez, Gemma L Kay, George O Akpede, Gert U van Zyl, Gordon A Awandare, Grace S Kpeli, Grit Schubert, Gugu P Maphalala, Hafaliana C Ranaivoson, Hannah E Omunakwe, Harris Onywera, Haruka Abe, Hela Karray, Hellen Nansumba, Henda Triki, Herve Albéric Adje Kadjo, Hesham Elgahzaly, Hlanai Gumbo, Hota Mathieu, Hugo Kavunga-Membo, Ibtihel Smeti, Idowu B Olawoye, Ifedayo M O Adetifa, Ikponmwosa Odia, Ilhem Boutiba Ben Boubaker, Iluoreh Ahmed Mohammad, Isaac Ssewanyana, Isatta Wurie, Iyaloo S Konstantinus, Jacqueline Wemboo Afiwa Halatoko, James Ayei, Janaki Sonoo, Jean-Claude C Makangara, Jean-Jacques M Tamfum, Jean-Michel Heraud, Jeffrey G Shaffer, Jennifer Giandhari, Jennifer Musyoki, Jerome Nkurunziza, Jessica N Uwanibe, Jinal N Bhiman, Jiro Yasuda, Joana Morais, Jocelyn Kiconco, John D Sandi, John Huddleston, John K Odoom, John M Morobe, John O Gyapong, John T Kayiwa, Johnson C Okolie, Joicymara S Xavier, Jones Gyamfi, Joseph F Wamala, Joseph H K Bonney, Joseph Nyandwi, Josie Everatt, Joweria Nakaseegu, Joyce M Ngoi, Joyce Namulondo, Judith U Oguzie, Julia C Andeko, Julius J Lutwama, Juma J H Mogga, Justin O'Grady, Katherine J Siddle, Kathleen Victoir, Kayode T Adeyemi, Kefentse A Tumedi, Kevin S Carvalho, Khadija Said Mohammed, Koussay Dellagi, Kunda G Musonda, Kwabena O Duedu, Lamia Fki-Berrajah, Lavanya Singh, Lenora M Kepler, Leon Biscornet, Leonardo de Oliveira Martins, Lucious Chabuka, Luicer Olubayo, Lul Deng Ojok, Lul Lojok Deng, Lynette I Ochola-Oyier, Lynn Tyers, Madisa Mine, Magalutcheemee Ramuth, Maha Mastouri, Mahmoud ElHefnawi, Maimouna Mbanne, Maitshwarelo I Matsheka, Malebogo Kebabonye, Mamadou Diop, Mambu Momoh, Maria da Luz Lima Mendonça, Marietjie Venter, Marietou F Paye, Martin Faye, Martin M Nyaga, Mathabo Mareka, Matoke-Muhia Damaris, Maureen W Mburu, Maximillian G Mpina, Michael Owusu, Michael R Wiley, Mirabeau Y Tatfeng, Mitoha Ondo'o Ayekaba, Mohamed Abouelhoda, Mohamed Amine Beloufa, Mohamed G Seadawy, Mohamed K Khalifa, Mooko Marethabile Matobo, Mouhamed Kane, Mounerou Salou, Mphaphi B Mbulawa, Mulenga Mwenda, Mushal Allam, My V T Phan, Nabil Abid, Nadine Rujeni, Nadir Abuzaid, Nalia Ismael, Nancy Elguindy, Ndeye Marieme Top, Ndongo Dia, Nédio Mabunda, Nei-Yuan Hsiao, Nelson Boricó Silochi, Ngiambudulu M Francisco, Ngonda Saasa, Nicholas Bbosa, Nickson Murunga, Nicksy Gumede, Nicole Wolter, Nikita Sitharam, Nnaemeka Ndodo, Nnennaya A Ajayi, Noël Tordo, Nokuzola Mbhele, Norosoa H Razanajatovo, Nosamiefan Iguosadolo, Nwando Mba, Ojide C Kingsley, Okogbenin Sylvanus, Oladiji Femi, Olubusuyi M Adewumi, Olumade Testimony, Olusola A Ogunsanya, Oluwatosin Fakayode, Onwe E Ogah, Ope-Ewe Oludayo, Ousmane Faye, Pamela Smith-Lawrence, Pascale Ondoa, Patrice Combe, Patricia Nabisubi, Patrick Semanda, Paul E Oluniyi, Paulo Arnaldo, Peter Kojo Quashie, Peter O Okokhere, Philip Bejon, Philippe Dussart, Phillip A Bester, Placide K Mbala, Pontiano Kaleebu, Priscilla Abechi, Rabeh El-Shesheny, Rageema Joseph, Ramy Karam Aziz, René G Essomba, Reuben Ayivor-Djanie, Richard Njouom, Richard O Phillips, Richmond Gorman, Robert A Kingsley, Rosa Maria D E S A Neto Rodrigues, Rosemary A Audu, Rosina A A Carr, Saba Gargouri, Saber Masmoudi, Sacha Bootsma, Safietou Sankhe, Sahra Isse Mohamed, Saibu Femi, Salma Mhalla, Salome Hosch, Samar Kamal Kassim, Samar Metha, Sameh Trabelsi, Sara Hassan Agwa, Sarah Wambui Mwangi, Seydou Doumbia, Sheila Makiala-Mandanda, Sherihane Aryeetey, Shymaa S Ahmed, Side Mohamed Ahmed, Siham Elhamoumi, Sikhulile Moyo, Silvia Lutucuta, Simani Gaseitsiwe, Simbirie Jalloh, Soa Fy Andriamandimby, Sobajo Oguntope, Solène Grayo, Sonia Lekana-Douki, Sophie Prosolek, Soumeya Ouangraoua, Stephanie van Wyk, Stephen F Schaffner, Stephen Kanyerezi, Steve Ahuka-Mundeke, Steven Rudder, Sureshnee Pillay, Susan Nabadda, Sylvie Behillil, Sylvie L Budiaki, Sylvie van der Werf, Tapfumanei Mashe, Thabo Mohale, Thanh Le-Viet, Thirumalaisamy P Velavan, Tobias Schindler, Tongai G Maponga, Trevor Bedford, Ugochukwu J Anyaneji, Ugwu Chinedu, Upasana Ramphal, Uwem E George, Vincent Enouf, Vishvanath Nene, Vivianne Gorova, Wael H Roshdy, Wasim Abdul Karim, William K Ampofo, Wolfgang Preiser, Wonderful T Choga, Yahaya Ali Ahmed, Yajna Ramphal, Yaw Bediako, Yeshnee Naidoo, Yvan Butera, Zaydah R de Laurent, Ahmed E O Ouma, Anne von Gottberg, George Githinji, Matshidiso Moeti, Oyewale Tomori, Pardis C Sabeti, Amadou A Sall, Samuel O Oyola, Yenew K Tebeje, Sofonias K Tessema, Tulio de Oliveira, Christian Happi, Richard Lessells, John Nkengasong, Eduan Wilkinson
Investment in SARS-CoV-2 sequencing in Africa over the past year has led to a major increase in the number of sequences generated, now exceeding 100,000 genomes, used to track the pandemic on the continent. Our results show an increase in the number of African countries able to sequence domestically, and highlight that local sequencing enables faster turnaround time and more regular routine surveillance. Despite limitations of low testing proportions, findings from this genomic surveillance study underscore the heterogeneous nature of the pandemic and shed light on the distinct dispersal dynamics of Variants of Concern, particularly Alpha, Beta, Delta, and Omicron, on the continent...
September 15, 2022: Science
https://read.qxmd.com/read/36074820/controlling-the-nucleation-and-growth-kinetics-of-lead-halide-perovskite-quantum-dots
#18
JOURNAL ARTICLE
Quinten A Akkerman, Tan P T Nguyen, Simon C Boehme, Federico Montanarella, Dmitry N Dirin, Philipp Wechsler, Finn Beiglböck, Gabriele Rainò, Rolf Erni, Claudine Katan, Jacky Even, Maksym V Kovalenko
Colloidal lead halide perovskite (LHP) nanocrystals are of interest as photoluminescent quantum dots (QDs) whose properties depend on the size and shape. They are normally synthesized on subsecond time scales through hard-to-control ionic metathesis reactions. We report a room-temperature synthesis of monodisperse, isolable spheroidal APbBr3 QDs (A=Cs, formamidinium, methylammonium) that are size-tunable from 3 to over 13 nanometers. The kinetics of both nucleation and growth are temporally separated and drastically slowed down by the intricate equilibrium between the precursor (PbBr2 ) and the A[PbBr3 ] solute, with the latter serving as a monomer...
September 8, 2022: Science
https://read.qxmd.com/read/36454850/exceptional-fracture-toughness-of-crconi-based-medium-and-high-entropy-alloys-at-20-kelvin
#19
JOURNAL ARTICLE
Dong Liu, Qin Yu, Saurabh Kabra, Ming Jiang, Paul Forna-Kreutzer, Ruopeng Zhang, Madelyn Payne, Flynn Walsh, Bernd Gludovatz, Mark Asta, Andrew M Minor, Easo P George, Robert O Ritchie
CrCoNi-based medium- and high-entropy alloys display outstanding damage tolerance, especially at cryogenic temperatures. In this study, we examined the fracture toughness values of the equiatomic CrCoNi and CrMnFeCoNi alloys at 20 kelvin (K). We found exceptionally high crack-initiation fracture toughnesses of 262 and 459 megapascal-meters½ (MPa·m½ ) for CrMnFeCoNi and CrCoNi, respectively; CrCoNi displayed a crack-growth toughness exceeding 540 MPa·m½ after 2.25 millimeters of stable cracking...
December 2, 2022: Science
https://read.qxmd.com/read/36454849/getting-tougher-in-the-ultracold
#20
JOURNAL ARTICLE
Peng Zhang, Zhe-Feng Zhang
Certain alloys show exceptional toughness in a liquid helium environment.
December 2, 2022: Science
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