Long-term spatiotemporal stability and dynamic changes in the haemoparasite community of spiny mice (Acomys dimidiatus) in four montane wadis in the St. Katherine Protectorate, Sinai, Egypt

AbstractThe importance of parasites as a selective force in host evolution is a topic of current interest. However, short-term ecological studies of host–parasite systems, on which such studies are usually based, provide only snap-shots of what may be dynamic systems. We report here on four surveys, carried out over a period of 12 years, of helminths of spiny mice (Acomys dimidiatus), the numerically dominant rodents inhabiting dry montane wadis in the Sinai Peninsula. With host age (age-dependent effects on prevalence and abundance were prominent) and sex (female bias in abundance in helminth diversity and in several taxa including Cestoda) taken into consideration, we focus on the relative importance of temporal and spatial effects on helminth infracommunities. We show that site of capture is the major determinant of prevalence and abundance of species (and higher taxa) contributing to helminth community structure, the only exceptions beingStreptopharausspp. andDentostomella kuntzi.We provide evidence that most (notably the Spiruroidea,Protospirura muricola,Mastophorus murisandGongylonema aegypti, but with exceptions among the Oxyuroidae, e.g.Syphacia minuta), show elements of temporal-site stability, with a rank order of measures among sites remaining similar over successive surveys. Hence, there are some elements of predictability in these systems.

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Stabilizing the framework of SAPO-34 zeolite toward long-term methanol-to-olefins conversion

Nature Communications ◽

10.1038/s41467-021-24403-2 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Liu Yang ◽

Chang Wang ◽

Lina Zhang ◽

Weili Dai ◽

Yueying Chu ◽

...

Keyword(s):

Nmr Spectroscopy ◽

Zeolite Catalyst ◽

Catalytic Efficiency ◽

Dynamic Changes ◽

Structural Dynamic ◽

Term Stability ◽

Long Term Stability ◽

Hydrocarbon Pool ◽

Intrinsic Good

AbstractAs a commercial MTO catalyst, SAPO-34 zeolite exhibits excellent recyclability probably due to its intrinsic good hydrothermal stability. However, the structural dynamic changes of SAPO-34 catalyst induced by hydrocarbon pool (HP) species and the water formed during the MTO conversion as well as its long-term stability after continuous regenerations are rarely investigated and poorly understood. Herein, the dynamic changes of SAPO-34 framework during the MTO conversion were identified by 1D 27Al, 31P MAS NMR, and 2D 31P-27Al HETCOR NMR spectroscopy. The breakage of T-O-T bonds in SAPO-34 catalyst during long-term continuous regenerations in the MTO conversion could be efficiently suppressed by pre-coking. The combination of catalyst pre-coking and water co-feeding is established to be an efficient strategy to promote the catalytic efficiency and long-term stability of SAPO-34 catalysts in the commercial MTO processes, also sheds light on the development of other high stable zeolite catalyst in the commercial catalysis.

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BrO/SO<sub>2</sub> molar ratios from scanning DOAS measurements in the NOVAC network

Solid Earth Discussions ◽

10.5194/sed-5-1845-2013 ◽

2013 ◽

Vol 5 (2) ◽

pp. 1845-1870 ◽

Cited By ~ 3

Author(s):

P. Lübcke ◽

N. Bobrowski ◽

S. Arellano ◽

B. Galle ◽

G. Garzón ◽

...

Keyword(s):

Molar Ratio ◽

Optical Absorption Spectroscopy ◽

Short Term ◽

Dynamic Changes ◽

Volcanic System ◽

Molar Ratios ◽

Remote Sensing Technique ◽

Field Campaigns ◽

Term Field

Abstract. The molar ratio of BrO to SO2 is, like other halogen/sulphur ratios, a~possible precursor for dynamic changes in the shallow part of a volcanic system. While the predictive significance of the BrO/SO2 ratio has not been well constrained yet, it has the major advantage that this ratio can be readily measured using the remote-sensing technique Differential Optical Absorption Spectroscopy (DOAS) in the UV. While BrO/SO2 ratios have been measured during several short-term field campaigns this article presents an algorithm that can be used to obtain long-term time series of BrO/SO2 ratios from the scanning DOAS instruments of the Network for Observation of Volcanic and Atmospheric Change (NOVAC) or comparable networks. Parameters of the DOAS retrieval of both trace gases are given and the influence of co-adding spectra on the retrieval error will be investigated. Difficulties in the evaluation of spectroscopic data from monitoring instruments in volcanic environments and possible solutions are discussed. The new algorithm is demonstrated by evaluating data from the NOVAC scanning DOAS systems at Nevado del Ruiz, Colombia encompassing almost four years of measurements between November 2009 and end of June 2013. This dataset shows variations of the BrO/SO2 ratio several weeks prior to the eruption on 30 June 2012.

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METHODOLOGY OF STRATEGIC MANAGEMENT IN THE AGRO-INDUSTRIAL COMPLEX

EKONOMIKA I UPRAVLENIE: PROBLEMY, RESHENIYA ◽

10.36871/ek.up.p.r.2021.05.01.005 ◽

2021 ◽

Vol 1 (5) ◽

pp. 39-54

Author(s):

А. M. NEKHLANOVA ◽

Keyword(s):

Strategic Management ◽

Agricultural Production ◽

Digital Technologies ◽

Industrial Complex ◽

Food Markets ◽

Dynamic Changes ◽

National Importance ◽

Intensive Development ◽

Global Food

The article presents the results of a study of the methodology of strategic management in the agro-industrial complex. In the context of dynamic changes in the external environment, the intensive development of global food markets, the accelerated introduction of digital technologies, biotechnologies, and genetic engineering, strategic management of the agro-industrial complex is an urgent scientific problem of national importance. The presented methodology takes into account the influence of the peculiarities of agricultural production on the formation of a strategic management system in the agro-industrial complex and allows the complex to function successfully in the long term.

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Effect of long-term tending on qualitative and quantitative production in mixed stands of spruce, fir and beech on Motyky research plot

Journal of Forest Science ◽

10.17221/4686-jfs ◽

2012 ◽

Vol 49 (No. 3) ◽

pp. 108-124 ◽

Cited By ~ 3

Author(s):

I. Štefančík ◽

L. Štefančík

Keyword(s):

Stand Structure ◽

Mixed Stands ◽

Dynamic Changes ◽

Tree Species Composition ◽

Silvicultural Treatments ◽

Altitudinal Zone ◽

Control Dynamic ◽

Crown Thinning ◽

And Control

The paper is a contribution to research on thinnings in mixed (spruce-fir-beech) stands situated in the fifth forest altitudinal zone in the central part of Slovakia. Three plots were tended by free crown thinning while one plot was left without any planned silvicultural treatment (as a control). Dynamic changes in tree species composition, stand structure and quantitative production were evaluated for a period of 30 years. A special attention was paid to development of crop trees that are the main bearers of stand quality and quantity. The changes were compared with respect to differences between plots with long-term silvicultural treatments and control plot (without treatments).    

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Variation in the helminth community structure in spiny mice (Acomys dimidiatus) from four montane wadis in the St Katherine region of the Sinai Peninsula in Egypt

Parasitology ◽

10.1017/s003118200400558x ◽

2004 ◽

Vol 129 (3) ◽

pp. 379-398 ◽

Cited By ~ 31

Author(s):

J. M. BEHNKE ◽

P. D. HARRIS ◽

A. BAJER ◽

C. J. BARNARD ◽

N. SHERIF ◽

...

Keyword(s):

Species Richness ◽

Life Histories ◽

Late Summer ◽

Helminth Community ◽

Component Community ◽

New Host ◽

Helminth Communities ◽

Spiny Mice ◽

Host Sex ◽

Acomys Dimidiatus

We compared helminth communities in spiny mice (Acomys dimidiatus) from 4 wadis in the arid montane region of the southern Sinai in Egypt, in a 4-week period in late summer. Total helminth species richness was 14 (8 nematodes, 5 cestodes and 1 acanthocephalan) with 94% of mice carrying at least 1 species and an overall mean species richness of 1·85. The most prevalent parasites wereProtospirura muricola(47·8%) andDentostomella kuntzi(46·3%). One larval cestode,Joyeuxiella rossicum, represents a new host record. The helminth community was dominated by intestinal nematodes (88·7%) of which 58·2% were arthropod-transmitted heteroxenic species. At the component community level, 70% of the worms were recovered from mice in just two wadis (Gharaba and Tlah) and 48·6% of intestinal nematodes were from Wadi Gharaba. Although only 7 species of helminths were recorded from Wadi Gharaba, this site gave the highest Berger-Parker dominance index because ofP. muricola. P. muricolawas also dominant in Wadi El Arbaein whilstSyphacia minutawas the dominant species in Wadis Gebal and Tlah. At the infracommunity level, mean species richness and Brillouin's index of diversity were highest in Wadi Tlah and lowest in Wadi Gebal, and the former was age dependent. Whilst mice from different wadis differed in the nematodes that were most common, those from Wadi Gharaba carried the highest mean number of worms/mouse. The abundance ofP. muricolain particular varied markedly between sites: Wadi Gharaba was distinct as the site showing the highest mean worm burden whereas mice from Wadi Gebal were uninfected. None of the directly transmitted oxyuroid nematodes showed significant variation in abundance between wadis, or host sex or age classes. Overall, the single extrinsic factor in the study, site of capture, was more important than the intrinsic factors in explaining variation in helminth communities in the region. We conclude that in the high mountains of southern Sinai, each wadi is distinct in terms of its rodent parasites, and hence we expect spatially different coevolutionary pressures on their hosts, with resultant variation in life-histories.

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Long-term dynamic changes in attached and planktonic microbial communities in a contaminated aquifer

Environmental Pollution ◽

10.1016/j.envpol.2021.116765 ◽

2021 ◽

Vol 277 ◽

pp. 116765

Author(s):

Juan F. Mujica-Alarcon ◽

Steven F. Thornton ◽

Stephen A. Rolfe

Keyword(s):

Microbial Communities ◽

Dynamic Changes ◽

Contaminated Aquifer

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Neurobiologic Considerations in Early Surgery for Epilepsy

Journal of Child Neurology ◽

10.1177/0883073894009002071 ◽

1994 ◽

Vol 9 (2_suppl) ◽

pp. 2S42-2S49 ◽

Cited By ~ 3

Author(s):

Michael Duchowny ◽

Bonnie Levin ◽

Prasanna Jayakar ◽

Trevor J. Resnick

Keyword(s):

Selection Process ◽

Early Years ◽

Early Surgery ◽

Onset Seizure ◽

Dynamic Changes ◽

Term Outcome ◽

Long Term Outcome ◽

Developmental Arrest ◽

Long Term Prognosis

Children with well-localized medically resistant seizures are often referred for surgical therapy. In young children, at least three maturational issues playa significant role in the selection process and long-term outcome. First, the early years are a time of exceptionally rapid brain development leading to dynamic changes in the electroencephalogram and the clinical expression of seizures. Many early-onset seizure presentations are also associated with catastrophic outcomes, developmental arrest, or regression. Second, the immature limbic system may be vulnerable to stresses operating in early life, although the consequences may not become apparent for many years. Third, in comparison to the adult, the child's nervous system typically exhibits superior functional recovery after lesioning, but the process of sparing and recovery is often incomplete. An understanding of how these neurobiologic factors influence developmental outcome will ultimately lead to greater selectivity of candidates for early surgery and to improved long-term prognosis. (J Child Neurol 1994;9(Suppl):2S42-2S49).

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Dynamic Changes of Arc Expression in Dorsal Striatum of Mice After Self-Administration of Sucrose

Frontiers in Cellular Neuroscience ◽

10.3389/fncel.2021.654521 ◽

2021 ◽

Vol 15 ◽

Author(s):

Xue Li ◽

Jing-Wang Zhao ◽

Qian Ding ◽

Cheng Wu ◽

Wan-Qi Li ◽

...

Keyword(s):

Instrumental Learning ◽

Dorsal Striatum ◽

Self Administration ◽

Dynamic Changes ◽

Learning Stage ◽

Initial Learning ◽

Molecular Substrates ◽

Term Maintenance ◽

Dorsomedial Striatum

Region-specific plasticity in the striatal circuit plays an important role in the development and long-term maintenance of skills and sequential movement procedures. Studies investigating the molecular substrates that contribute to the plasticity changes during motor skill processes have documented a transition in expression from the dorsomedial striatum (DMS) to the dorsolateral striatum (DLS); however, few studies have explored the expression pattern of molecular substrates in the dorsal striatum during progression of instrumental learning. To address this issue, the activity-regulated cytoskeleton-associated protein (Arc) expressions in the subregional dorsal striatum were analyzed during the early and late learning phases of the 10-day sucrose self-administration process. We found that Arc protein is primarily detected in the DMS only in the initial learning stage; however, it is expressed in the DLS during both early and late learning stages. Moreover, Arc expression in the DMS correlated with the number of rewards received later in the training. These data indicated that the Arc expression in subregions of the dorsal striatum shows region-specific transfer and that Arc expression in the DMS contributes to obtaining reward in later learning stage during the process of instrumental learning.

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MULTI BAND INSAR ANALYSIS OF SUBSIDENCE DEVELOPMENT BASED ON THE LONG PERIOD TIME SERIES

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprsarchives-xl-1-w5-115-2015 ◽

2015 ◽

Vol XL-1-W5 ◽

pp. 115-121 ◽

Cited By ~ 3

Author(s):

F. C. Çomut ◽

A. Ustun ◽

M. Lazecky ◽

M. M. Aref

Keyword(s):

Time Series ◽

Vertical Direction ◽

Geodetic Network ◽

Sar Interferometry ◽

Subsidence Trough ◽

Dynamic Changes ◽

Industrial Growth ◽

Network Time ◽

The Impact

The SAR Interferometry (InSAR) application has shown great potential in monitoring of land terrain changes and in detection of land deformations such as subsidence. Longer time analysis can lead to understand longer trends and changes. Using different bands of SAR satellite (C- from ERS 1-2 and Envisat, L- from ALOS) over the study area, we achieve knowledge of movements in long-term and evaluation of its dynamic changes within observed period of time. Results from InSAR processing fit with the position changes in vertical direction based on GPS network established over the basin as an effective geodetic network. Time series (StaMPS PS+SB) of several points over Çumra County in eastern part of Konya City show a general trend of the deformation that is expected to be approximately between -13 to -17 mm/year. Northern part of Karaman is affected by faster subsidence, borders of the subsidence trough were identified from Envisat. <br><br> Presenting InSAR results together with GIS information about locations and time of occurrence of sudden subsidence, urban/industrial growth in time and climate changes helps in better understanding of the situation. This way, the impact of natural and man-made changes will be shown for urban planning thanks to InSAR and GIS comparisons with hydrogeological modeling. In this study we present results of differential and multitemporal InSAR series using different bands and GIS conjunction associated with seasonal and temporal groundwater level changes in Konya Closed Basin.

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