scientific american - 1993 06 - tuning in the radio signals of ancient galaxies
scientific american - 1993 06 - tuning in the radio signals of ancient galaxies
... boththen at the University of Edinburgh, ob-served radio galaxies from the 3C cata-logue in the infrared using the U.K. In- frared Telescope in Hawaii. They thenconstructed a graph of redshift ... consid-ered to be a radio galaxy.Another likely in uence on the ob-served properties of radio- emitting gal-axies is the nature of the local environ-ment surrounding the radio source. If the ... chro-mosome in SCID.They decided to test the hypothesis that defects in the gam-ma-chain gene were causing the im-munodeficiency. With the further assis-tance of Howard M. Rosenblatt of the Baylor...
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SCIENTIFIC DEVELOPMENTS AND TECHNICAL CHALLENGES IN THE PROGRESSIVE CONTROL OF FMD IN SOUTH ASIA pot
... regional significance in the past 3 years; type A Iran-05 (BAR-08 strain) in 2008, the type O Panasia-2 epidemic in 201 0-1 1, and the Asia-1 epidemic of 201 1-1 2, all of which involved east to west ... knowledge of the influence of each of the factors and implement measures from the start of virus production up to the packaging of the produced vaccine in order to prevent negative influences on the ... efforts are going on in addressing the major challenge of increasing the duration of immunity and development of new generation vaccines. The salient research accomplishments in the development...
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scientific american - 1993 01 - the turbulent birth of the milky way
... values of its variables.Checking is simply a matter of mak-ing sure the calculated value of the poly-nomial at any point matches that as-serted in the proof. Only a small num-ber of points ... received her fatherÕs grudg-ing consent, Levi-Montalcini studied for the entrance examination and then en-rolled in the Turin School of Medicineat the age of 21. Drawn to a famous, ec-centric ... centersÑone in the Indo-Pa-ciÞc and the other in the Caribbean. The outlines of a map marking plum-meting diversity coincide with the con-tours of lower seawater temperatures. The narrow temperature...
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scientific american - 1993 02 - beating resistance in superconductors
... tidying up some of the loose ends in the in ationÓ ac-count of the origins of the universe. In- ßation theorists suggest that the uni-verse began as a highly curved core of matter. At some point, ... alone.Copyright 1993 Scientific American, Inc.40 SCIENTIFIC AMERICAN February 1993 ests of the developed and the develop-ing worlds.Human actions bring about scar-cities of renewable resources in three ... farming, herding and Þshing along the Mauritanian riverbank.There has been a long history of rac-ism by white Moors in Mauritania to-ward their non-Arab, black compatri-ots. In the spring of...
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scientific american - 1993 03 - black holes and the centrifugal force paradox
... ferrying the virus across the blood-brain barrier. Another main-tains the blood-brain barrier is some-how disrupted, permitting the entry of viral particles or infected cells.Once there, the virus ... basis of what she actually sees. I callthis the seeing-is-believing principle.The true signiÞcance of the see-ing-is-believing principle was notrevealed to me until 1985. Oneday in the spring ... nuclei of some galaxies. The viscous stress tends to make the rota-tion of the accretion disk more rigid,thereby slowing down the rapidly ro-tating inner part of the disk and speed-ing up the...
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scientific american - 1993 04 - controlling the quantum jitters of atoms
... stable, the highbirth rates of the baby boom postponed the aging of the population by widen-ing the base of the age structure again.As the baby boomers grow older, how-ever, the average age of the ... sense the state of atoms after theyhave passed through the cavity. The red laser beam traces the line of the in- frared laser used to excite the atoms; the blue beam marks the path of the atomsthemselves. ... during the 21st century. The trend is already pro-nounced in the industrialized countries. Within just a few de-cades, much of the population in the developing world willCopyright 1993 Scientific...
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scientific american - 1993 09 - special issue - life, death, and the immune system
... villainÕs role in other autoimmunediseases: in insulin-dependent diabetes,T lymphocytes destroy insulin-produc-ing cells in the pancreas, and in multiplesclerosis, they direct their fury against the ... During these interac-tions, the B cell can also in uence the activity of the T cell.B CELLT CELLLYMPHOKINESCopyright 1993 Scientific American, Inc.uterus and prostate. These findings hintthat ... successivekinds of T cells that populate the lining(epithelium) of the skin, various oriÞces(such as the mouth and vagina) and the organs that connect with them (the gas-trointestinal tract,...
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scientific american - 1993 10 - is los angeles winning the war on smog
... and the origin of new species. The recognition of large igneous prov-inces has forced geophysicists to re-think their notions regarding the struc-ture of the earthÕs interior. The theory of plate ... in a chain, the sequence could be determined in the following way. After labeling the chains,they could be broken down into individ-ual amino acids, indicating, say, that Bwas at one end of ... between the strands. By 1955 he found a way to pre-vent the introduction of cross-links andsucceeded in determining the completestructure of insulin.Four years later, Sanger won the No-bel...
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scientific american - 1993 11 - reading the genes of extinct species
... to suspend the trading rights of countries that sanc-tion the use of purse-seine nets in tunaÞshing and of leg-hold traps in trap-ping. Such punishments seem an in- appropriate use of state ... growth), they do so at the expense of labor in the high-wage coun-tries. They thereby increase income in- equality there. Most citizens are wageearners. In the U.S., 80 percent of the labor ... discov-ered in a few cases of the relatively rareearly-onset form of AlzheimerÕs a muta-tion in the gene responsible for the pro-duction of amyloid beta-protein, whichis deposited in the brains...
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scientific american - 1994 06 - was there a race to the moon
... conditions. At the be-ginning of the race, the runners line upat the startÑthat is, they are well local-ized. Each one runs in one of the quan-tized Bohr orbits. During the initial laps, the runners ... initial lu-nar-landing attempt had slipped into the second half of 1969. The U.S. was well aware of the Sovietdecision to proceed with the N-1 but forseveral years remained unsure of the kind of ... instead on wide-spread cooperation. The space stationmay serve as the harbinger of a newkind of foreign policy, one that brings the nations of the world together in the peaceful conquest of...
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Từ khóa: which native american tribe was involved in the trail of tearsamerican expansionism and imperialism in the late nineteenth centuryamerican expansion and imperialism in the late 19th centurydiscuss american expansion and imperialism in the late 19th centuryamerican phrases not used in the ukwhat native american tribe was involved in the trail of tearsradio frequency spectrum management in the uk part of region 1radio frequency spectrum management in the us part of region 22000 quot effectiveness of hemodialysis in the extracorporeal therapy of phenobarbital overdose quot american journal of kidney diseases 36 4 tr 640 6432000 effectiveness of hemodialysis in the extracorporeal therapy of phenobarbital overdose american journal of kidney diseases vol 36 4 pp 640 643search in the lost sense of queryindustry in the united states of americain the finite sequence of positive integersgirl in the other side of love videosean paul in the other side of loveBáo cáo thực tập tại nhà thuốc tại Thành phố Hồ Chí Minh năm 2018chuyên đề điện xoay chiều theo dạngNghiên cứu tổ hợp chất chỉ điểm sinh học vWF, VCAM 1, MCP 1, d dimer trong chẩn đoán và tiên lượng nhồi máu não cấpNghiên cứu vật liệu biến hóa (metamaterials) hấp thụ sóng điện tử ở vùng tần số THzđề thi thử THPTQG 2019 toán THPT chuyên thái bình lần 2 có lời giảiGiáo án Sinh học 11 bài 13: Thực hành phát hiện diệp lục và carôtenôitGiáo án Sinh học 11 bài 13: Thực hành phát hiện diệp lục và carôtenôitQuản lý hoạt động học tập của học sinh theo hướng phát triển kỹ năng học tập hợp tác tại các trường phổ thông dân tộc bán trú huyện ba chẽ, tỉnh quảng ninhĐịnh tội danh từ thực tiễn huyện Cần Giuộc, tỉnh Long An (Luận văn thạc sĩ)Tìm hiểu công cụ đánh giá hệ thống đảm bảo an toàn hệ thống thông tinThơ nôm tứ tuyệt trào phúng hồ xuân hươngThiết kế và chế tạo mô hình biến tần (inverter) cho máy điều hòa không khíChuong 2 nhận dạng rui roBT Tieng anh 6 UNIT 2Nguyên tắc phân hóa trách nhiệm hình sự đối với người dưới 18 tuổi phạm tội trong pháp luật hình sự Việt Nam (Luận văn thạc sĩ)Giáo án Sinh học 11 bài 14: Thực hành phát hiện hô hấp ở thực vậtTrách nhiệm của người sử dụng lao động đối với lao động nữ theo pháp luật lao động Việt Nam từ thực tiễn các khu công nghiệp tại thành phố Hồ Chí Minh (Luận văn thạc sĩ)BÀI HOÀN CHỈNH TỔNG QUAN VỀ MẠNG XÃ HỘIHIỆU QUẢ CỦA MÔ HÌNH XỬ LÝ BÙN HOẠT TÍNH BẰNG KIỀMMÔN TRUYỀN THÔNG MARKETING TÍCH HỢP