Results 41 to 50 of about 49,097 (207)

Phosphoranaloga von Aminosäuren und Peptiden: Kettenverlängerung von Carbonylverbindungen

open access: yesCHIMIA, 1982
Synthesis of carbonyl compounds 5 involving the Wittig-Horner reaction of diethyl-1-isocyanoalkylphosphonate 1 with carbonyl compounds 2 and subsequent hydrolysis of the vinyl isocyanides 3 formed is reported.
Janusz Rachoń
doaj   +1 more source

Características Morfológicas e Bioquímicas do pólen coletado por cinco espécies de Meliponíneos da Amazônia Central [PDF]

open access: yesActa Amazonica, 2002
Durante um ano, o pólen transportado por Melipona compressipes manaosensis, Melipona seminigra merrillae, Melipona seminigra seminigra, Frieseomelitta sp. e Scaptotrigona sp. foi coletado diretamente das corbículas das operárias.
Antonio Carlos MARQUES-SOUZA   +4 more
doaj   +1 more source

Alexander von Humboldt und die polnische Wissenschafts- und Kulturwelt

open access: yesHiN - Alexander von Humboldt im Netz. Internationale Zeitschrift für Humboldt-Studien, 2017
Zusammenfassung Alexander von Humboldt war in Polen bereits im ausgehenden 18. Jahrhundert berühmt geworden. Er reiste mehrmals nach Polen und unterhielt Kontakte zu polnischen oder polnischstämmigen Wissenschaftlern.
Izabela Drozdowska-Broering
doaj   +1 more source

Honokiol regulates Acute respiratory distress syndrome (ARDS)‐associated pulmonary fibrosis via the miR‐19a‐3p/POSTN axis

open access: yesBritish Journal of Pharmacology, Volume 183, Issue 21, Page 6329-6351, November 2026.
Abstract Background and Purpose Acute respiratory distress syndrome (ARDS) and subsequent pulmonary fibrosis are associated with high mortality and limited treatment options. Periostin (POSTN) is a profibrotic mediator predicted to be regulated by microRNA‐19a‐3p (miR‐19a‐3p), but the relevance of this axis in ARDS‐associated pulmonary fibrosis remains
Weilun Liu   +14 more
wiley   +1 more source

The MexMAGIC population reveals the genetic architecture of traits exhibiting clinal variation in Mexican native maize

open access: yesNew Phytologist, Volume 252, Issue 3, Page 1296-1313, November 2026.
The MexMAGIC population mixes native maize varieties from across Mexico to study functional genetic diversity. Summary Defining the genetic basis of local adaptation is a key goal of evolutionary biology and crop improvement. Theory predicts that when selective pressures follow differences in the environment, a cline will be established.
Sergio Perez‐Limón   +18 more
wiley   +1 more source

USING STUDY PAGES IN A BILINGUAL DICTIONARY IN GERMAN LANGUAGE CLASSES

open access: yesMetodički Vidici, 2013
The starting point is the assumption that bilingual dictionaries are not used very often during German language classes. The influence of electronic media results in the fact that paper dictionaries are not in use and students do not know how to make use
Joanna Szczęk
doaj  

Evolution in arid environments: the role of betalains, succulence, and medullary bundles

open access: yesNew Phytologist, Volume 252, Issue 3, Page 1250-1268, November 2026.
Overview of the study system. Summary The flowering plant clade Caryophyllales includes many succulent species that grow in drought conditions. Many Caryophyllales species also have betalain pigmentation and medullary bundles, both of which have been linked to stress tolerance, albeit with less precise functional characterisation.
Tom Carruthers   +6 more
wiley   +1 more source

Polske drømmer, polske skremmebilder

open access: yesArbeiderhistorie
Målet med denne artikkelen er å analysere den norske venstresidens ulike fremstillinger av den polske fagbevegelsen Solidaritet i 1980–81. Hovedkildene er publikasjoner utgitt av de fire partiene på venstresiden, Det norske Arbeiderparti, Sosialistisk ...
Michał Gęsiarz
doaj   +1 more source

Oak masting under climate change: when spatially heterogeneous shifts in flowering phenology reshape pollen limitation

open access: yesNew Phytologist, Volume 252, Issue 3, Page 1314-1326, November 2026.
Conceptual framework illustrating the pollen variables and the hypotheses linking trajectories of pollen phenology and masting. Summary Masting, the irregular, synchronised production of seeds within tree populations, drives forest regeneration and ecosystem dynamics.
Emilie Fleurot   +5 more
wiley   +1 more source

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