全文获取类型
收费全文 | 135篇 |
免费 | 9篇 |
出版年
2023年 | 4篇 |
2022年 | 2篇 |
2021年 | 12篇 |
2020年 | 2篇 |
2019年 | 7篇 |
2018年 | 10篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 14篇 |
2014年 | 16篇 |
2013年 | 12篇 |
2012年 | 8篇 |
2011年 | 6篇 |
2010年 | 1篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 5篇 |
2006年 | 1篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有144条查询结果,搜索用时 15 毫秒
91.
Heike Culmsee Ramadhanil Pitopang Hardianto Mangopo Sahar Sabir 《Biodiversity and Conservation》2011,20(5):1103-1123
Tropical high mountain forests in Lore Lindu National Park, Sulawesi, Indonesia, were described by their floristic composition
and the importance of tree families (Family importance values, FIV), based on tree inventories conducted on 4 plots (each
0.24 ha) in old-growth forest stands at c. 1800 and 2400 m a.s.l. (mid- and upper montane elevations). To identify general
patterns and regional peculiarities of the forests in the SE Asian and SW Pacific context, the biogeography of the tree species
was analysed using distribution records. Out of the total of 87 tree species, only 18 species were found at both elevational
zones. The discovery of new species and new distribution records (28% of the data set) highlights the deficiencies in the
taxonomic and distribution data for Sulawesi. Sulawesi endemism rate was 20%. In the mid-montane Fagaceae–Myrtaceae forests,
Lithocarpus spp. (Fagaceae) were overall important (4 spp. occupying around half of the total basal area) and the Myrtaceae the most
species rich (8 spp.), thus showing typical features of Malesian montane forests. The upper montane conifer-Myrtaceae forest
contained several high mountain tree taxa and showed affinity to the forests of New Guinea. The mountain flora comprised both
eastern and western Malesian elements, with the nearest neighbouring islands Borneo and Maluku both sharing species with Sulawesi,
reflecting the complex palaeogeography of the island. A separate analysis showed the mid-montane forest to possess greatest
biogeographical affinity to Borneo/western Malesia, and the upper montane forest had a number of typical elements of Papuasia/eastern
Malesia and the Phillipines, which may be a result of historical patterns in land connection and the emergence of mountain
ranges. 相似文献
92.
93.
Asif Mir Kumudesh Sritharan Kirti Mittal Nasim Vasli Carolina Araujo Talal Jamil Muhammad Arshad Rafiq Zubair Anwar Anna Mikhailov Sobiah Rauf Huda Mahmood Abdul Shakoor Sabir Ali Joyce So Farooq Naeem Muhammad Ayub John B. Vincent 《Human genetics》2014,133(8):975-984
In this study, we have performed autozygosity mapping on a large consanguineous Pakistani family segregating with intellectual disability. We identified two large regions of homozygosity-by-descent (HBD) on 16q12.2–q21 and 16q24.1–q24.3. Whole exome sequencing (WES) was performed on an affected individual from the family, but initially, no obvious mutation was detected. However, three genes within the HBD regions that were not fully captured during the WES were Sanger sequenced and we identified a five base pair deletion (actually six base pairs deleted plus one base pair inserted) in exon 7 of the gene FBXO31. The variant segregated completely in the family, in recessive fashion giving a LOD score of 3.95. This variant leads to a frameshift and a premature stop codon and truncation of the FBXO31 protein, p.(Cys283Asnfs*81). Quantification of mRNA and protein expression suggests that nonsense-mediated mRNA decay also contributes to the loss of FBXO31 protein in affected individuals. FBXO31 functions as a centrosomal E3 ubiquitin ligase, in association with SKP1 and Cullin-1, involved in ubiquitination of proteins targeted for degradation. The FBXO31/SKP1/Cullin1 complex is important for neuronal morphogenesis and axonal identity. FBXO31 also plays a role in dendrite growth and neuronal migration in developing cerebellar cortex. Our finding adds further evidence of the involvement of disruption of the protein ubiquitination pathway in intellectual disability. 相似文献
94.
Jamal S. M. Sabir Mengjie Yu Matt P. Ashworth Nabih A. Baeshen Mohammad N. Baeshen Ahmed Bahieldin Edward C. Theriot Robert K. Jansen 《PloS one》2014,9(9)
Diatoms are mostly photosynthetic eukaryotes within the heterokont lineage. Variable plastid genome sizes and extensive genome rearrangements have been observed across the diatom phylogeny, but little is known about plastid genome evolution within order- or family-level clades. The Thalassiosirales is one of the more comprehensively studied orders in terms of both genetics and morphology. Seven complete diatom plastid genomes are reported here including four Thalassiosirales: Thalassiosira weissflogii, Roundia cardiophora, Cyclotella sp. WC03_2, Cyclotella sp. L04_2, and three additional non-Thalassiosirales species Chaetoceros simplex, Cerataulina daemon, and Rhizosolenia imbricata. The sizes of the seven genomes vary from 116,459 to 129,498 bp, and their genomes are compact and lack introns. The larger size of the plastid genomes of Thalassiosirales compared to other diatoms is due primarily to expansion of the inverted repeat. Gene content within Thalassiosirales is more conserved compared to other diatom lineages. Gene order within Thalassiosirales is highly conserved except for the extensive genome rearrangement in Thalassiosira oceanica. Cyclotella nana, Thalassiosira weissflogii and Roundia cardiophora share an identical gene order, which is inferred to be the ancestral order for the Thalassiosirales, differing from that of the other two Cyclotella species by a single inversion. The genes ilvB and ilvH are missing in all six diatom plastid genomes except for Cerataulina daemon, suggesting an independent gain of these genes in this species. The acpP1 gene is missing in all Thalassiosirales, suggesting that its loss may be a synapomorphy for the order and this gene may have been functionally transferred to the nucleus. Three genes involved in photosynthesis, psaE, psaI, psaM, are missing in Rhizosolenia imbricata, which represents the first documented instance of the loss of photosynthetic genes in diatom plastid genomes. 相似文献
95.
Ahmed M. Shokry Saleh Al-Karim Ahmed Ramadan Nour Gadallah Sanaa G. Al Attas Jamal S.M. Sabir Sabah M. Hassan Magdy A. Madkour Ray Bressan Magdy Mahfouz Ahmed Bahieldin 《Comptes rendus biologies》2014,337(2):86-94
The wild plant species Calotropis procera (C. procera) has many potential applications and beneficial uses in medicine, industry and ornamental field. It also represents an excellent source of genes for drought and salt tolerance. Genes encoding proteins that contain the conserved universal stress protein (USP) domain are known to provide organisms like bacteria, archaea, fungi, protozoa and plants with the ability to respond to a plethora of environmental stresses. However, information on the possible occurrence of Usp in C. procera is not available. In this study, we uncovered and characterized a one-class A Usp-like (UspA-like, NCBI accession No. KC954274) gene in this medicinal plant from the de novo assembled genome contigs of the high-throughput sequencing dataset. A number of GenBank accessions for Usp sequences were blasted with the recovered de novo assembled contigs. Homology modelling of the deduced amino acids (NCBI accession No. AGT02387) was further carried out using Swiss-Model, accessible via the EXPASY. Superimposition of C. procera USPA-like full sequence model on Thermus thermophilus USP UniProt protein (PDB accession No. Q5SJV7) was constructed using RasMol and Deep-View programs. The functional domains of the novel USPA-like amino acids sequence were identified from the NCBI conserved domain database (CDD) that provide insights into sequence structure/function relationships, as well as domain models imported from a number of external source databases (Pfam, SMART, COG, PRK, TIGRFAM). 相似文献
96.
97.
98.
Background
Recent outbreaks of cutaneous leishmaniasis make the disease a public health concern in Punjab, Pakistan. The knowledge of how the population perceives the disease and its vector is essential in order to design an effective management strategy, but such studies are rare in Pakistan.Methodology/Principal Findings
The present study was based on a cross-sectional self-administered survey comprising 250 household samples collected from five localities including Bhawalpur, Multan, Jhang, Faisalabad and Lahore. The results revealed that the respondents had a poor knowledge of the vector and disease. Few of the respondents were aware about the identification of sand flies, their breeding place, biting time, transmission of leishmaniasis and control measures. Skin infection and sandflies as the main disease symptom and vector of the disease, respectively, were known to some of the respondents. Some believed that summer was the main peak incidence of the disease and it could be transmitted from man to man via contact. However, most of the respondents believed that the disease could be cured. Admission to hospitals, cleanliness and use of bed nets were the treatment measures for the disease in suspected patients, whereas some thought that the use of bed nets could be helpful in preventing leishmaniasis infection.Conclusions/Significance
Poor knowledge of the disease and its vector in the study population emphasize the need to initiate health education and awareness campaigns to minimize the risks of cutaneous leishmaniasis outbreaks in the future. 相似文献99.
Farzana Sabir Smrati Mishra Rajender S. Sangwan Jyoti S. Jadaun Neelam S. Sangwan 《Protoplasma》2013,250(2):539-549
Withania somnifera Dunal is an important and extensively studied medicinal plant; however, there is no report available that relates withanolide content and its profile in relation to the expression of pathway genes during different morphogenic stages. In this study, withanolide A, withaferin A, and withanone, the major withanolides of W. somnifera, were measured in different in vitro stages during organogenesis, viz., shoot to root (direct rhizogenesis)/root to shoot (indirect via callus phase) transition vis-à-vis expression levels of key pathway genes involved in withanolide biosynthetic pathways. The morphogenic transitions were found to be tightly linked to the pattern of accumulation of withanolides. The high expression levels of most of the pathway genes in in vitro shoots in comparison to in vitro root and callus tissues exhibited a direct co-relation with the maximum withanolide content (>2.7 mg/gDW). The biogenesis of withaferin A, a major constituent of the leaves, was however found to be tightly linked to shoots/green tissue. In addition, we were also able to establish an efficient regeneration system from roots for their further utilization in biotechnological applications. 相似文献
100.
R V Farese J L Orchard R E Larson M A Sabir J S Davis 《Biochimica et biophysica acta》1985,846(2):296-304
Rat pancreatic fragments and acinar preparations were incubated in vitro to characterize further the changes in phosphoinositide metabolism that occur during secretagogue action. Two distinct responses were discernible. The first response, most notably involving a decrease in phosphatidylinositol content, was (a) observed at lower carbachol concentrations in dose-response studies, (b) inhibited by incubation in Ca2+-free media containing 1 mM EGTA, (c) associated with increases in inositol monophosphate production, and (d) provoked by all tissue secretagogues (carbachol, cholecystokinin, secretin, insulin, dibutyryl cAMP and the ionophore A23187), regardless of whether their mechanism of action primarily involved Ca2+ mobilization or cAMP generation. This decrease in phosphatidylinositol content was at least partly due to phospholipase C (and/or D) activation, as evidenced by the increase in inositol monophosphate. The second response, most notably involving markedly increased incorporation of 32PO4 into phosphatidic acid and phosphatidylinositol, was (a) observed at higher carbachol concentrations, (b) not influenced by incubation in Ca2+-free media containing 1 mM EGTA, and (c) associated with increases in inositol triphosphate production. This 32PO4 turnover response was probably largely the result of phospholipase C-mediated hydrolysis of phosphatidylinositol 4',5'-diphosphate, which, as shown previously, also occurs at higher carbachol concentrations and is insensitive to comparable EGTA-induced Ca2+ deficiency. This phosphatidylinositol 4',5'-diphosphate hydrolysis response was only observed in the action of agents (carbachol and cholecystokinin) which mobilize Ca2+ via activation of cell surface receptors. The present results indicate that phosphatidylinositol and phosphatidylinositol 4',5'-diphosphate hydrolysis are truly separable responses to secretagogues acting in the rat pancreas. Furthermore, phosphatidylinositol 4',5'-diphosphate, rather than phosphatidylinositol hydrolysis is more likely to be associated with receptor activation and Ca2+ mobilization. 相似文献