996 resultados para anas gracilis


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Genes for glycolytic and Calvin-cycle glyceraldehyde-3-phosphate dehydrogenase (GAPDH) of higher eukaryotes derive from ancient gene duplications which occurred in eubacterial genomes; both were transferred to the nucleus during the course of endosymbiosis. We have cloned cDNAs encoding chloroplast and cytosolic GAPDH from the early-branching photosynthetic protist Euglena gracilis and have determined the structure of its nuclear gene for cytosolic GAPDH. The gene contains four introns which possess unusual secondary structures, do not obey the GT-AG rule, and are flanked by 2- to 3-bp direct repeats. A gene phylogeny for these sequences in the context of eubacterial homologues indicates that euglenozoa, like higher eukaryotes, have obtained their GAPDH genes from eubacteria via endosymbiotic (organelle-to-nucleus) gene transfer. The data further suggest that the early-branching protists Giardia lamblia and Entamoeba histolytica--which lack mitochondria--and portions of the trypanosome lineage have acquired GAPDH genes from eubacterial donors which did not ultimately give rise to contemporary membrane-bound organelles. Evidence that "cryptic" (possibly ephemeral) endosymbioses during evolution may have entailed successful gene transfer is preserved in protist nuclear gene sequences.

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1. Risālah fī al-khulūw wa-wujūhihi ʻinda al-Miṣrīyīn wa-al-Maghāribah / li-Ismāʻīl al-Tamīmī -- 2. Suʼāl wa-fatāwá ʻanh / li-Ibrāhīm al-Riyāḥī -- 3. Asʼilah wa-ajwibah fī masāʼil al-kardār / li-Aḥmad ibn al-Khūjah -- 4. Faṣl fī ʻĀrīyat al-khulūw wa-faṣl fī al-inzālāt min Manẓūmat Laqṭ al-durar / li-Muḥammad al-Sanūsī -- 5. Jumlat Taqārīr wa-fatāwá fī al-khalawāt wa-al-inzālāt / li-Muḥammad Bayram wa-al-Shādhilī ibn Ṣāliḥ -- 6. Risālah fī Taḥqīq masʼalat al-khulūw ʻinda al-Mālikīyah / li-Aḥmad al-Fayyūmī al-Farqāwī al-Miṣrī -- 7. Risālah fī al-Kalām ʻalá bayʻ al-waqf idhā khariba wa-mā li-ahl al-madhhab min al-kalām fī dhālik / li-Yaḥyá ibn Muḥammad al-Ḥaṭṭāb.

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Haliptilon gracile var. verticillatum (J.V.Lamouroux) H.W.Johansen var. verticillatum (E.Y. Dawson) Garbary & H.W.Johansen, determined by E. Yale Dawson

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Mode of access: Internet.

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Mémoires de la classe des sciences mathématiques et physiques de l'Institut, 1808, pp. 251-256.

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Tese (doutorado)—Universidade de Brasília, Instituto de Letras, Programa de Pós-Graduação em Literatura, 2016.