Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Marine rare actinomycetes: A promising source of structurally diverse and unique novel natural products
Subramani, Ramesh ; Sipkema, Detmer - \ 2019
Marine Drugs 17 (2019)5. - ISSN 1660-3397
cbioactive compounds - Cultivation - Marine actinobacteria - Naturalproducts - Rare actinomycetes

Rare actinomycetes are prolific in the marine environment; however, knowledge about their diversity, distribution and biochemistry is limited. Marine rare actinomycetes represent a rather untapped source of chemically diverse secondary metabolites and novel bioactive compounds. In this review, we aim to summarize the present knowledge on the isolation, diversity, distribution and natural product discovery of marine rare actinomycetes reported from mid-2013 to 2017. A total of 97 new species, representing 9 novel genera and belonging to 27 families of marine rare actinomycetes have been reported, with the highest numbers of novel isolates from the families Pseudonocardiaceae, Demequinaceae, Micromonosporaceae and Nocardioidaceae. Additionally, this study reviewed 167 new bioactive compounds produced by 58 different rare actinomycete species representing 24 genera. Most of the compounds produced by the marine rare actinomycetes present antibacterial, antifungal, antiparasitic, anticancer or antimalarial activities. The highest numbers of natural products were derived from the genera Nocardiopsis, Micromonospora, Salinispora and Pseudonocardia. Members of the genus Micromonospora were revealed to be the richest source of chemically diverse and unique bioactive natural products.

The fatal flaws of compassionate conservation
Oommen, Meera Anna ; Cooney, Rosie ; Ramesh, Madhuri ; Archer, Michael ; Brockington, Daniel ; Buscher, Bram ; Fletcher, Robert ; Natusch, Daniel J.D. ; Vanak, Abi T. ; Webb, Grahame ; Shanker, Kartik - \ 2019
Conservation Biology 33 (2019)4. - ISSN 0888-8892 - p. 784 - 787.
Strategies to Improve Stroke Care Services in Low- and Middle-Income Countries : A Systematic Review
Pandian, J.D. ; William, Akanksha G. ; Kate, Mahesh P. ; Norrving, Bo ; Mensah, George A. ; Davis, Stephen ; Roth, Gregory A. ; Thrift, Amanda G. ; Kengne, Andre P. ; Kissela, Brett M. ; Yu, Chuanhua ; Kim, Daniel ; Rojas-Rueda, David ; Tirschwell, David L. ; Abd-Allah, Foad ; Gankpé, Fortuné ; Deveber, Gabrielle ; Hankey, Graeme J. ; Jonas, Jost B. ; Sheth, Kevin N. ; Dokova, Klara ; Mehndiratta, Man Mohan ; Geleijnse, Johanna M. ; Giroud, Maurice ; Bejot, Yannick ; Sacco, Ralph ; Sahathevan, Ramesh ; Hamadeh, Randah Ribhi ; Gillum, Richard F. ; Westerman, Ronny ; Akinyemi, Rufus Olusola ; Barker-Collo, Suzanne ; Truelsen, Thomas ; Caso, Valeria ; Rajagopalan, Vasanthan ; Venketasubramanian, Narayanaswamy ; Vlassovi, Vasiliy V. ; Feigin, Valery L. - \ 2017
Neuroepidemiology 49 (2017)1-2. - ISSN 0251-5350 - p. 45 - 61.

Background: The burden of stroke in low- and middle-income countries (LMICs) is large and increasing, challenging the already stretched health-care services. Aims and Objectives: To determine the quality of existing stroke-care services in LMICs and to highlight indigenous, inexpensive, evidence-based implementable strategies being used in stroke-care. Methods: A detailed literature search was undertaken using PubMed and Google scholar from January 1966 to October 2015 using a range of search terms. Of 921 publications, 373 papers were shortlisted and 31 articles on existing stroke-services were included. Results: We identified efficient models of ambulance transport and pre-notification. Stroke Units (SU) are available in some countries, but are relatively sparse and mostly provided by the private sector. Very few patients were thrombolysed; this could be increased with telemedicine and governmental subsidies. Adherence to secondary preventive drugs is affected by limited availability and affordability, emphasizing the importance of primary prevention. Training of paramedics, care-givers and nurses in post-stroke care is feasible. Conclusion: In this systematic review, we found several reports on evidence-based implementable stroke services in LMICs. Some strategies are economic, feasible and reproducible but remain untested. Data on their outcomes and sustainability is limited. Further research on implementation of locally and regionally adapted stroke-services and cost-effective secondary prevention programs should be a priority.

Tipping from the Holocene to the Anthropocene: How threatened are major world deltas?
Renaud, F.G. ; Syvitski, J.P.M. ; Werners, S.E. ; Kremer, H. ; Kuenzer, C. ; Ramesh, R. ; Jeuken, A. - \ 2013
Current Opinion in Environmental Sustainability 5 (2013)6. - ISSN 1877-3435 - p. 644 - 654.
social-ecological systems - sea-level rise - climate-change - mississippi delta - northern india - river - thresholds - discharge - sediment - impact
Coastal deltas are landforms that typically offer a wide variety of benefits to society including highly fertile soils for agricultural development, freshwater resources, and rich biodiversity. For these reasons, many deltas are densely populated, are important economic hubs, and have been transformed by human interventions such as agricultural intensification, modification of water and sediment fluxes, as well as urbanization and industrialization. Additionally, deltas are increasingly affected by the consequences of climate change including sea level rise, and by other natural hazards such as cyclones and storm surges. Five examples of major deltas (Rhine-Meuse, Ganges, Indus, Mekong, and Danube) illustrate the force of human interventions in shaping and transforming deltas and in inducing shifts between four different social-ecological system (SES) states: Holocene, modified Holocene, Anthropocene and ‘collapsed’. The three Asian deltas are rapidly changing but whereas SES in the Ganges and Indus deltas are in danger of tipping into a ‘collapsed’ state, SES in the Mekong delta, which is at the crossroads of various development pathways, could increase in resilience in the future. The Rhine-Meuse and Danube delta examples show that highly managed states may allow, under specific conditions, for interventions leading to increasingly resilient systems. However, little is known about the long-term effects of rapid human interventions in deltas. It is therefore critical to increase the knowledge-base related to SES dynamics and to better characterize social tipping points or turning points in order to avoid unacceptable changes.
Estimating parameters of neutral communities: From one single large to several small samples
Munoz, F. ; Couteron, P. ; Ramesh, B.R. ; Etienne, R.S. - \ 2007
Ecology 88 (2007)10. - ISSN 0012-9658 - p. 2482 - 2488.
biodiversity - populations - alleles - evolution - formula
The neutral theory of S. P. Hubbell postulates a two-scale hierarchical framework consisting of a metacommunity following the speciation¿drift equilibrium characterized by the ``biodiversity number¿¿ h, and local communities following the migration¿drift equilibrium characterized by the ``migration rate¿¿ m (or the ``fundamental dispersal number¿¿ I). While Etienne¿s sampling formula allows simultaneous estimation of h and m from a single sample of a local community, its applicability to a network of (rather small) samples is questionable. We define here an alternative two-stage approach estimating h from an adequate subset of the individuals sampled in the field (using Ewens¿ sampling formula) and m from community samples (using Etienne¿s sampling formula). We compare its results with the simultaneous estimation of h and m (one-stage estimation), for simulated neutral samples and for 50 1-ha plots of evergreen forest in South India. The one-stage approach exhibits problems of bias and of poor differentiability between high-h, low-m and low-h, high-m solution domains. Conversely, the two-stage approach yielded reasonable estimates and is to be preferred when several small, scattered plots are available instead of a single large one.
Transitions in rice cultivation for enhancing water productivity - a case study in Krishna western delta
Kalpana, D. ; Ramesh Chandra, S. ; Satyanarayana, T.V. ; Subba Rao, G. ; Prasad, P.R.K. ; Mukunda Rao, B. ; Srinivas, D. ; Ravi Kumar, K.N. ; Boonstra, J. - \ 2006
In: Proceedings of 2nd international conference on hydrology and watershed management with a focal theme on improving water productivity in the agriculture; Vol. 1, Hyderabad (India), 5-8 December 2006. - Hyderabad (India) : BS Publications - ISBN 8178001381 - p. 454 - 459.
Effects of bamboo substrate and supplemental feeding on growth and production of hybrid red tilapia fingerlings (Oreochromis mossambicusxOrechromis niloticus)
Keshavanath, P. ; Gangadhar, B. ; Ramesh, T.J. ; Dam, A.A. van; Beveridge, M.C.M. ; Verdegem, M.C.J. - \ 2004
Aquaculture 235 (2004)1-4. - ISSN 0044-8486 - p. 303 - 314.
periphyton-based aquaculture - nile tilapia - food quality - phytoplankton - optimization - assimilation - culture - energy - fishes - carps
Periphyton growing on artificial substrates can increase the production of herbivorous fish in aquaculture ponds. Periphyton may be an alternative or a complement for supplemental feed in fingerling production. Growth and production of hybrid red tilapia (Oreochromis mossambicus x Oreochromis niloticus) were evaluated in twelve 5 x 5 x 1-m(3) concrete mud-bottomed tanks with bamboo poles for periphyton production. Submerged tank wall surface was 16 m(2). There were three densities of 1.5-m bamboo poles: 0, 98 and 196 poles/25 m(2), resulting in 0, 18.5 and 37 m(2) of additional pole surface per tank. Tanks were stocked with red tilapia try (average weight 1.2 g) at 25 fish tank(-1). At each substrate density, half of the tanks were fed with a fishmeal-based 35% protein diet at 5% body weight day(-1). Fish were harvested after 75 days. During the experiment, periphyton density on the substrates (ash-free dry matter [AFDM], ash and chlorophyll a) and water quality were monitored regularly. Water quality was favourable for fish growth and there were only minor differences between the treatments. Periphyton biomass density on the substrates initially increased and was subsequently reduced during the experiment due to fish gazing. Final mean (+/-S.E.) gross fish yields (g/25 m(2)) without substrates were 850.3 g (+/-73.7) without and 1225.7 (+/-193.7) with feeding. With 98 poles tank(-1), gross yields increased to 1803.8 (+/-79. 1) without and 2141.8 (+/-221.7) with feeding. With 196 poles tank(-1), yields were not or only marginally higher. Although more experiments are needed to optimize periphyton density in relation to fish size and stocking density, the results show that periphyton can replace or complement supplemental feeding in tilapia fingerling culture. (C) 2004 Elsevier B.V. All rights reserved.
The effect of periphyton and supplemental feeding on the production of the indigenous carps Tor Khudree and Labeo fimbriatus
Keshavanath, P. ; Gangadhar, B. ; Ramesh, T.J. ; Dam, A.A. van; Beveridge, M.C.M. ; Verdegem, M.C.J. - \ 2002
Aquaculture 213 (2002). - ISSN 0044-8486 - p. 207 - 218.
On-farm evaluation of Indian major carp production with sugarcane bagasse as substrate for periphyton
Keshavanath, P. ; Ganghadar, B. ; Ramesh, T.J. ; Beveridge, M.C.M. ; Dam, A.A. van; Verdegem, M.C.J. - \ 2001
Asian Fisheries Science 14 (2001)4. - ISSN 0116-6514 - p. 367 - 376.
Use of artificial substrates to enhance production of fresh water herbivorous fish in pond culture
Keshavanath, P. ; Gangadhar, B. ; Ramesh, T.J. ; Rooij, J.M. van; Beveridge, M.C.M. ; Baird, D. ; Verdegem, M.C.J. - \ 2001
Aquaculture Research 32 (2001). - ISSN 1355-557X - p. 189 - 197.
Two trials were conducted in mud-bottomed concrete tanks to assess the potential of using artificial substrates to enhance fish production in ponds. Three substrate types were tested: bamboo poles, PVC pipes and sugarcane bagasse bundles. In one trial, periphyton was grown on the substrates in the absence of fish. In the second trial, masheer (Tor khudree Sykes) fingerlings were stocked at three densities. Results showed a significant effect of substrate type on fish growth (P 0.001) and on net fish production (P 0.05), with best growth in the tanks using the bamboo substrate. In the bagasse treatment, 100 percent fish mortality occurred. Highest extrapolated periphyton-based gross fish yield (i.e. without feed inputs) was 450 kg ha1 90 d1 with PVC and 491 kg ha1 90 d1 with bamboo substrate. The best periphyton growth occurred on bamboo, followed by bagasse and PVC. Without fish, mean periphyton biomass during the culture period was 0.56-1.20 mg cm2 on bamboo [ash-free dry matter (DM)], against 0.09-0.36 mg cm2 on PVC and 0.20-0.59 mg cm2 on bagasse. No clear effect of fish density or water depth on periphyton biomass could be seen. Only on bamboo, fish density seemed to have a negative effect on periphyton ash-free dry matter and a positive effect on pigment content (chlorophyll-a and phaeophytin). Periphyton from bamboo had a lower ash content (38-47 percent of DM) than from PVC (54-55 percent of DM) or bagasse (51-58 percent of DM). It is concluded that substrate type has a strong effect on periphyton productivity and composition, and on fish productivity. Good fish production was achieved without feed inputs. More research is needed to study the economic viability of periphyton-based systems in the context of Indian aquaculture.
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