Crototropone, a new tropone derivative from Croton zehntneri     

Bracher F  Randau KP  Lerche H 《Fitoterapia》2008,79(3):236-237

Crototropone (3-hydroxy-5,6-dimethoxy-2-methylcyclohepta-2,4,6-trien-1-one) was isolated from roots of Croton zehntneri. The structure was established by spectroscopic methods.  相似文献   

Rapid sequence modification in the highly polymorphic region (HPR) of the hemagglutinin gene of the infectious salmon anaemia virus (ISAV) suggests intra-segmental template switching recombination     

Matías Cárdenas  Claudia Galleguillos  Karina Acevedo  Catarina Ananias  Javiera Alarcón  Sofía Michelson  Jorge Toledo  Margarita Montoya  Claudio Meneses  Eduardo Castro-Nallar  Yesseny Vásquez-Martínez  Marcelo Cortez-San Martin 《Journal of fish diseases》2020,43(12):1483-1496

The ISAV has a genome composed of eight segments of (–)ssRNA, segment 6 codes for the hemagglutinin–esterase protein, and has the most variable region of the genome, the highly polymorphic region (HPR), which is unique among orthomyxoviruses. The HPR has been associated with virulence, infectivity and pathogenicity. The full length of the HPR is called HPR0 and the strain with this HPR is avirulent, in contrast to strains with deleted HPR that are virulent to varying degrees. The molecular mechanism that gives rise to the different HPRs remains unclear. Here, we studied in vitro the evolution of reassortant recombinant ISAV (rISAV) in Atlantic salmon head kidney (ASK) cells. To this end, we rescued and cultivated a set of rISAV with different segment 6-HPR genotypes using a reverse genetics system and then sequencing HPR regions of the viruses. Our results show rapid multiple recombination events in ISAV, with sequence insertions and deletions in the HPR, indicating a dynamic process. Inserted sequences can be found in four segments of the ISAV genome (segments 1, 5, 6, and 8). The results suggest intra-segmental heterologous recombination, probably by class I and class II template switching, similar to the proposed segment 5 recombination mechanism.  相似文献   

Increased growth hormone (GH), growth hormone receptor (GHR), and insulin-like growth factor I (IGF-I) gene transcription after hyperosmotic stress in the Brazilian flounder Paralichthys orbignyanus     

Karina M. Meier  Márcio A. Figueiredo  Michel T. Kamimura  Jomar Laurino  Rodrigo Maggioni  Luciano S. Pinto  Odir A. Dellagostin  Marcelo B. Tesser  Luís A. Sampaio  Luis F. Marins 《Fish physiology and biochemistry》2009,35(3):501-509

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Energy and protein requirements of non-descript breed hair lambs of different sex classes in the semiarid region of Brazil     

Rafael Torres de Souza Rodrigues  Mario Luiz Chizzotti  Samara Rodrigues Martins  Ivonete Ferreira da Silva  Mário Adriano Ávila Queiroz  Tiago Santos Silva  Karina Costa Busato  Aderbal Marcos de Azevêdo Silva 《Tropical animal health and production》2016,48(1):87-94

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Detoxified castor meal in substitution of soybean meal in sheep diet: growth performance,carcass characteristics and meat yield     

Daniel Ribeiro Menezes  Roberto Germano Costa  Gherman Garcia Leal de Araújo  Luiz Gustavo Ribeiro Pereira  Geovergue Rodrigues de Medeiros  Juliana Silva Oliveira  Thiago Vinicius Costa Nascimento  Rafael Torres de Souza Rodrigues  José Morais Pereira Filho  Karina Costa Busato 《Tropical animal health and production》2016,48(2):297-302

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Net requirements of calcium,phosphorus, magnesium,and sulphur for growth of non-descript breed hair lambs of different sex classes in the Brazilian semiarid conditions     

Ivonete Ferreira da Silva  Rafael Torres de Souza Rodrigues  Mário Adriano Ávila Queiroz  Mario Luiz Chizzotti  Marcus Antonio Zanetti  José Aparecido da Cunha  Karina Costa Busato 《Tropical animal health and production》2016,48(4):817-822

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Estimation of daily milk yield of Nellore cows grazing tropical pastures     

Daniel Mageste de Almeida  Marcos Inácio Marcondes  Luciana Navajas Rennó  Lívia Vieira de Barros  Carla Heloísa Avelino Cabral  Leandro Soares Martins  David Esteban Contreras Marquez  Felipe Vélez Saldarriaga  Faider Alberto Castaño Villadiego  Manuela Acevedo Cardozo  Roman Maza Ortega  Javier Enrique Garces Cardenas  Virginia Lucia Neves Brandão  Mário Fonseca Paulino 《Tropical animal health and production》2018,50(8):1771-1777

Beef cows’ milk yield is typically determined by measuring milk yield once daily and then doubling this value to estimate daily production. However, it is not known whether this is accurate. Thus, we aimed to determine the association between morning and afternoon milk yield in grazing Nellore cows. Eighty Nellore cows were used, with initial weight of 516.0?±?1.0 kg. The experiment was a completely randomized factorial scheme, with 20 replications and four treatments (i.e., +?or ??pre-partum supplementation in combination with +?or ??post-partum supplementation): PRMM—1 kg of supplement/cow/day for 90 days pre-partum; MMPS—1 kg of supplement/cow/day for 90 days post-partum; PRPS—1 kg of supplement/cow/day for 90 days pre-partum and 90 days post-partum; and MM—only mineral mix ad libitum during pre- and post-partum. Milk was sampled on days 45, 135, and 225 post-partum (early, middle, and late lactation, respectively). No effects were observed of pre- and post-partum supplementation on milk yield (P?>?0.05). The afternoon/morning proportion of 0.45 in the early third of lactation was higher than other stages, which had a proportion of 0.41 (P?<?0.05). Post-partum supplementation increased milk protein in the morning and afternoon milking (P?<?0.05). There was also no effect of pre- and post-partum supplementation on afternoon-morning proportion other milk components (P?>?0.05). We conclude that estimating daily milk production of grazing beef cattle by multiplying a once daily milking amount times two is not accurate. Under the conditions of this study, proportion of total daily production represented by the ratio of afternoon/morning milking was 0.45 in early lactation (first third) and 0.41 in mid- and late lactation.  相似文献   

The modern state of the European saiga population (Saiga tatarica tatarica): mtDNA,DRB3 MHC gene,and microsatellite diversity     

Nadezhda Vladimirovna KASHININA  Anna Anatolievna LUSHCHEKINA  Pavel Alexandrovich SOROKIN  Karina Karenovna TARASYAN  Marina Vladimirovna KHOLODOVA 《Integrative zoology》2023,18(4):661-676

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Roraimine: a bisbenzylisoquinoline alkaloid from Cissampelos sympodialis roots     

de Lira GA  de Andrade LM  Florêncio KC  da Silva MS  Barbosa-Filho JM  Leitão da-Cunha EV 《Fitoterapia》2002,73(4):356-358

The roots of Cissampelos sympodialis yielded Roraimine (1), a novel bisbenzylisoquinoline alkaloid and liriodenine (2), a known oxoaporphine alkaloid.  相似文献   

Mapping resistance genes conferring tolerance to RWA (Diuraphis noxia) in barley (Hordeum vulgare)     

E. Tocho  M. Ricci  M. S. Tacaliti  D. O. Giménez  A. Acevedo  U. Lohwasser  A. B?rner  A. M. Castro 《Euphytica》2012,188(2):239-251

The Russian wheat aphid (RWA) is one of the most aggressive pests of barley and wheat. The outbreak of RWA occurred in Argentina in 2008 caused serious damage to barley cultivars. The most effective and sustainable method of RWA control is to identify new resistance genes. The purpose of the current research was to map RWA resistance genes in a set of double haploid (DH) lines of the Oregon-Wolfe Barley (OWB) mapping population derived from the cross between OWB_DOM and OWB_REC. The DH and both parental lines were screened for antixenosis, tolerance and antibiosis to RWA. There was significant variation among the DH lines in most of the traits studied. However, only tolerance resulted in significant quantitative trait loci (QTLs) associated with the molecular markers. Two main QTLs were identified. These explained 90 and 79 % of the variability of foliar area and chlorophyll content, respectively, of infested and control plants. The initial and final foliar area and the variation in foliar area were associated with the same molecular markers on chromosome 2H (BmAc0125, Vrs1, BmAc0144f and BmAg0113e). The positive alleles were provided by OWB_DOM. The content of chlorophyll was associated with the marker loci WMC1E8, MWG912, ABC261, MWG2028 and Blp on chromosome 1H, with the positive alleles provided by OWB_REC. Both parents contributed to different tolerance traits, with foliar area and chlorophyll content remaining as the plant traits most affected by aphid feeding. The QTLs found in this population are new RWA resistance loci. A sequence homology search was performed to derive the putative function of the genes linked to the QTLs.  相似文献