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| 1 | The composition and diversity of natural regeneration of tree species in gaps under different intensities of forest disturbance显示文摘The positive ecological interaction between gap formation and natural regeneration has been examined but little research has been carried out on the effects of gaps on natural regeneration in forests under different intensities of disturbance.This study evaluates the composition,diversity,regeneration density and abundance of natural regeneration of tree species in gaps in undisturbed,intermittently disturbed,and disturbed forest sites.Bia Tano Forest Reserve in Ghana was the study area and three gaps each were selected in the three forest site categories.Ten circular subsampling areas of 1 m2 were delineated at 2 m spacing along north,south,east,and west transects within individual gaps.Data on natural regeneration<350 cm height were gathered.The results show that the intensity of disturbance was disproportional to gap size.Species diversity differed significantly between undisturbed and disturbed sites and,also between intermittently disturbed and disturbed sites for Simpson’s(1-D),Equitability(J),and Berger-Parker(B-P)indices.However,there was no significant difference among forest sites for Shannon diversity(H)and Margalef richness(MI)indices.Tree species composition on the sites differed.Regeneration density on the disturbed site was significantly higher than on the two other sites.Greater abundance and density of shade-dependent species on all sites identified them as opportunistic replacements of gap-dependent pioneers.Pioneer species giving way to shade tolerant species is a natural process,thus make them worst variant in gap regeneration. | Maame Esi Hammond Radek Pokorný Daniel Okae-Anti Augustine Gyedu Irene Otwuwa Obeng | 2021 | Journal of Forestry Research2021，32，5： | 3 |
| 2 | The effects of co-infection with human parvovirus B19 and Plasmodium falciparum on type and degree of anaemia in Ghanaian children显示文摘Objective:To determin the extent to which parvovirus B19(B19V)and co-infection of B19V and malaria contribute to risk of anaemia in children.Methods:B19V DNA and malaria parasites were screened for 234 children at the PMI,Children's Hospital in Accra.The role of B19V and coinfection with B19V and malaria in anaemia was evaluated by analysing full blood cell counts,malaria and B19V DNA results from these children.Results:The prevalence of B19V,malaria and co-infection with B19V and malaria was 4.7%,41.9%and 2.6%,respectively.Malaria posed a greater risk in the development of mild anaemia compared to severe anaemia(OR=5.28 vrs3.15)whereas B19V posed a higher risk in the development of severe anaemia compared to mild anaemia(OR=4.07 vrs 1.00)from a non-anaemic child.Persons with co-infection with B19V and malaria had 2.23 times the risk(95%CI=0.40-12.54)of developing severe anaemia should they already have a mild anaemia.The degree of anaemia was about three times affected by coinfection(Pillai's trace=0.551,P=0.001)as was affected by malaria alone(Pillai's trace=0.185,P=0.001).B19V alone did not significantly affect the development of anaemia in a non-anaemic child.Microcytic anaemia was associated with B19V and co-infection with B19V and malaria more than normocytic normochromic anaemia.Conclusions:B19V was associated with malaria in cases of severe anaemia.The association posed a significant risk for exacerbation of anaemia in mild anaemic children.B19V and co-infection with B19V and malaria may be associated with microcytic anaemia rather than normocytic normochromic anaemia as seen in cases of B19V infection among persons with red cell abnormalities. | Kwabena Obeng Duedu Kwamena William Coleman Sagoe Patrick Ferdinand Ayeh-Kumi Raymond Bedu Affrim Theophilus Adiku | 2013 | Asian Pacific Journal of Tropical Biomedicine2013，3，2： | 3 |
| 3 | Caspase-12 and caspase-4 are not required for caspase dependent endoplasmic retieulum stress-induced apoptosis显示文摘 | Obeng EA Boise LH | 2005 | J Biol Chem2005，280，29： | 1 |
| 4 | Application of central composite rotatable design to modeling the effect of some operating variables on the performance of the three-product cyclone显示文摘 | Obeng DP Morrell S Napier-Munn TJ | | 0，，03： | 1 |
| 5 | Effect of annealing on surface microstruetural evolution and the electromigration reliability of electroplated Cu films 显示文摘 | Kang S H Obeng Y S Decker M A | 2001 | Journal of Electronic Materials2001，30，12： | 1 |
| 6 | Applicability of dynamic mechanical analysis for CMP poly- urethane pad studies显示文摘 | Lu H Obeng Y Richardson K A | 2002 | Meterials Characteri- zation2002，49，2： | 1 |
| 7 | Langrnuir显示文摘 | Obeng Y S Bard A J | 1991 | 7 : 1951991，7，： | 1 |
| 8 | ApplicabilitY of dynamic mechanical analysis forCMP Polyurethane Pad studies显示文摘 | Lu H Obeng Y | 2003 | Materials Characterization2003，49，： | 1 |
| 9 | Sources of productivity change: A malmquist total factor productivity approach显示文摘 | Boame K A Obeng K | 2005 | Transport Reviews2005，，1： | 1 |
| 10 | Proteasome inhibitors induce a terminal unfolded protein response in multiple myeloma cells显示文摘 | Obeng EA Carlson LM Gutman DM | 2006 | Blood2006，107，12： | 1 |
| 11 | Caspase-12 and caspase-4 are not required forcaspase-dependent endoplas mic reticulum stress induced apoptosis显示文摘 | Obeng EA Boise LH | 2005 | J Biol Chem2005，280，29： | 1 |
| 12 | Applicability of dynamic mechanical analysis for CMP polyurethane pad studies显示文摘 | Lu H Obeng Y | 2003 | Materials Characterization2003，49，： | 1 |
| 13 | Quantitative analysis of physical and chemical changes in CMP polyurethane pad surfaces显示文摘 | Lu H Fookes B Obeng Y | 2002 | Materials Characterization2002，49，： | 1 |
| 14 | Application of a circulating-cathodic-antigen (CCA) strip test and real-time PCR, in comparison with microscopy, for the detection of Schistosoma haenurtobium in urine samples from Ghana 显示文摘 | Obeng BB Aryeetey YA de Dood C J | 2008 | Ann Trop Med Parasitol2008，102，7： | 1 |
| 15 | Physical and functional interaction of sequestosome 1 with Keapl regulates the Keapl-Nrf2 cell defense pathway显示文摘 | Copple I M Lister A Obeng A D Kitteringham N R Jenkins R E Layfield R Foster B J | | 0，，22： | 1 |
| 16 | Application of central composite rotatable design to modeling the effect of some operating variables on the performance of the three-product cyclone显示文摘 | OBENG D P MORRELL S NAPIER-MUNN T J | | 0，，： | 1 |
| 17 | Application of central composite rotatable design to modeling the effect of some operating variables on the performance of the three-product cyclone 显示文摘 | OBENG D P MORRELL S NAPIER-MUNN T J | 2005 | International Journal of Mineral Processing2005，76，： | 1 |
| 18 | The JK three-product cyclone—performance and potential applications显示文摘 | D.P Obeng S Morrell | 2003 | International Journal of Mineral Processing2003，，1： | 1 |
| 19 | Langmuir Films of C60 at the Air-Interface显示文摘 | Obeng Y S Bard A J | 1991 | J Am Chem Soc1991，113，： | 1 |
| 20 | Caspase-12 and caspase-4 are not requirecl for caspase-dependent endoplasmic reticulum stress-induced apoptosis显示文摘 | Obeng EA Boise LH | 2005 | J Biol Chem2005，280，29： | 1 |
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