Movement behavior and passive dispersal of a reintroduced population of alligator snapping turtles

Maladaptive movement behavior is a leading cause of failure for reptile reintroductions, thus characterizing movement for translocated populations is important to project success. From 2014–2016 we radio-tracked 183 immature reintroduced alligator snapping turtles (Macrochelys temminckii) using very high frequency telemetry in a stream in southern Illinois, USA. We assessed environmental, temporal, morphometric, and microhabitat factors influencing movement, including post-release dispersal from reintroduction sites, movement probability, and step length. We used directional statistics to investigate the effects of precipitation and age on directional movement in the stream. Numerous factors influenced active movement, including ambient temperatures, time since release, use of log jams, turtle size, and age. Precipitation had an age-biased effect on movement. Directional analyses suggested that movement was largely passive as turtles were swept downstream with increased discharge. Overall, the behavior of reintroduced alligator snapping turtles was similar to that reported in wild populations. Passive downstream transport has implications for reintroduced and natural populations as a force for unintentional emigration in channelized streams under current conditions and future high flow regimes.     

人口流动性对感染性疾病扩散与传播的影响

研究人口流动性对具有斑快结构的感染性疾病传播与扩散的影响,讨论了具有斑块结构感染性疾病SIS模型的全局稳定性,得到了该模型基本再生数的倍增效应．     

Evaluation of the Effect of Surfactants on the Movement of Pesticides in Soils Using a Soil Thin-Layer Chromatography Technique

In this study, the effect of concentration (1/2 CMC, at CMC and 2 x CMC) of surfactants, cetyl trimethyl ammonium bromide (cationic), sodium dodecyl sulfate (anionic), and tween ‘20’ (non-ionic) on the movement of carbofuran, chlorpyrifos and en-dosulfan in soils was evaluated by using a soil thin-layer chromatographic technique. The movement of pesticides was detected by spray reagents and expressed in terms of Rf values. The penetrability K was found to increase by decreasing the plate angle and followed the order as: sandy loam > loam > silt loam soils. The penetrability K also decreases in surfactant-free and surfactant-amended soils when developed in distilled water and aqueous surfactant solutions of different CMCs, respectively. The higher movement of pesticides was observed in sandy loam soil followed by loam and silt loam soils. On the basis of Rf values, the movement of pesticides follows the order as: carbofuran > chlorpyrifos > endosulfan, both in surfactant-amended and surfactant-free soils when developed in distilled water and aqueous surfactant solutions of different CMCs. The movement is directly proportional to the aqueous solubilities, polarities, and carbon numbers and inversely related to the molecular weights of pesticides. A significant increase or decrease of pesticides movement in soils was discussed on the basis of adsorption of pesticides on soils, chemical nature of the surfactants, and its concentrations in terms of critical micelle concentrations (CMCs) in soils and eluents. Results obtained may provide insights pertaining to the use of surfactants for solving soil pollution problems posed by pesticides.     

The role of phosphorylation on the structure and dynamics of phospholamban: a model from molecular simulations

Phospholamban (PLB) is a small membrane protein that regulates the activity of the calcium ATP-ase in the cardiac, slow-twitch, and smooth muscle sarcoplasmic reticulum through the reversible phosphorylation of Ser16. We present here a comparative molecular dynamics study of unmodified and phosphorylated PLB immersed in a phospholipid membrane. The study has been performed under different ionic strength conditions, using the NMR structures of two PLB variants determined in mixed organic solvent and dodecylphosphocholine micelles. The simulations indicate that all PLB forms studied display a highly dynamic behavior of the N-terminal cytoplasmic moiety, with a decrease of its helical content in the phosphorylated forms. The cytoplasmic domain undergoes large collective motions sampling conformations parallel as well as perpendicular to the membrane surface in all the simulations. The transmembrane domain retains a tightly folded helical conformation with a small tilt with respect to the membrane plane probably induced by the presence of Asn30 and Asn34 within the hydrophobic environment. Furthermore, the phosphoric group on Ser16 establishes transient electrostatic interactions with the phospholipid heads. We propose a model in which phosphorylation diminishes the probability of interactions of PLB with residues near Lys400 in the SERCA pump, thus relieving its inhibition.     

Effect of Extracellular Ca2+ and Ca2+-Antagonists on the Movement and Chemoorientation of Male Gametes of Ectocarpus siliculosus (Phaeophyceae)

Chemoorientation in male gametes of Ectocarpus siliculosus in response to sexual pheromones is effected by two distinct mechanisms, chemokinesis and chemoklinotaxis. These are characterized by a strongly asymmetric bending pattern of the anteriorly-directed flagellum and transient unilateral bending of the hind flagellum, respectively. Removal of extracellular Ca²⁺ showed that normal flagellar movement and chemokinesis require millimolar concentrations of Ca²⁺ in the medium. The response to pheromones is strongly inhibited by La³⁺, whereas the Ca²⁺-channel drugs, verapamil and nifedipine, have only little effect. Nifedipine nethertheless effectively inhibited accumulation at pheromone sources. These results are interpreted as an indication for the involvement of two pharmacologically distinct Ca²⁺-channels in chemokinesis and chemoklinotaxis. The calmodulin-antagonist, trifluoperazine, induces, at low concentrations, the same flagellar response in chemokinesis as the pheromone, the mechanism of action remaining unknown.     

The Effect of Soil Type on Movement and Infection Rate of Larvae of Tylenchulus semipenetrans

Most of the Tylenchulus semipenetrans larvae applied on the surface of four soils in pots 14.5-cm deep moved no further downward than 6.5 crn, and remained in the upper half of the pot. The percentage of second-stage larvae that developed into adult females on ''Homosassa'' sweet orange in the soils were: sandy loam, 6.8% in the same soil with inoculation holes, 8.6%; loamy sand, 5.4%; coarse sand, 0.2%; and in sand-peat (2:1, v/v)mixture 0.04%. Low percentage infection in coarse sand and sand-peat mixture may have been caused by restriction of larval migration in the coarse sand, and by low pH or toxic organic acids in the sand-peat mixture. Good root development occurred throughout all soils.     

Effect of stochastic resonance on proprioception and kinesthesia in anterior cruciate ligament reconstructed patients

Low amplitude mechanical noise vibration has been shown to improve somatosensory acuity in various clinical groups with comparable deficiencies through a phenomenon known as Stochastic Resonance (SR). This technology showed promising outcomes in improving somatosensory acuity in other clinical patients (e.g., Parkinson’s disease and osteoarthritis). Some degree of chronic somatosensory deficiency in the knee has been reported following anterior cruciate ligament (ACL) reconstruction surgery. In this study, the effect of the SR phenomenon on improving knee somatosensory acuity (proprioception and kinesthesia) in female ACL reconstructed (ACLR) participants (n = 19) was tested at three months post-surgery, and the results were compared to healthy controls (n = 28). Proprioception was quantified by the measure of joint position sense (JPS) and kinesthesia with the threshold to detection of passive movement (TDPM).The results based on the statistical analysis demonstrated an overall difference between the somatosensory acuity in the ACLR limb compared to healthy controls (p = 0.007). A larger TDPM was observed in the ACLR limb compared to the healthy controls (p = 0.002). However, the JPS between the ACLR and healthy limbs were not statistically significantly different (p = 0.365). SR significantly improved JPS (p = 0.006) while the effect was more pronounced in the ACLR cohort. The effect on the TDPM did not reach statistical significance (p = 0.681) in either group.In conclusion, deficient kinesthesia in the ACLR limb was observed at three months post-surgery. Also, the positive effects of SR on somatosensory acuity in the ACL reconstructed group warrant further investigation into the use of this phenomenon to improve proprioception in ACLR and healthy groups.     

The Effect of Light and Exogenously Supplied Ammonium Ions on Glutamate Dehydrogenase Activity and Isoforms in Young Mustard (Sinapis alba L.) Seedlings

Glutamate dehydrogenase (GDH, E.C. 1.4.1.3) of mustard cotyledons was investigated during the first 4 days of seedling development. The enzyme was found to be composed of seven catalytically active isoforms (each with a molecular mass of 270 kDa) which exhibited a charge heterogeneity when investigated by isoelectric focusing. Antibodies against the purified isoform 7, raised in rabbits, cross-reacted with each of the isoforms in Western blotting experiments. In addition, each of the isoforms was composed of four immunopositive reacting polypeptides with 19, 21, 23 and 25 kDa. During development of the seedlings, a shift in the isoform pattern towards the more acidic forms was found which was more pronounced when the seedlings were supplied with 15 mM NH₄Cl. The time course of changes in total GDH level can be correlated with the time course of disappearance of storage proteins. Both parameters are negatively regulated by light possibly via the photoreceptor, phytochrome. There are some indications that GDH in young mustard cotyledons mainly acts in the deaminating direction.     

腰腹肌运动联合超声波对非特异性下腰痛的治疗效果及机制

为了解腰腹肌运动联合超声波治疗的效果,本研究对腰腹肌运动联合超声波治疗非特异性下腰痛进行了探讨。研究显示,治疗4周后,腰腹肌运动+超声波治疗组的疼痛评分(0.73)显著低于超声波治疗组(1.22)(p<0.05)。腰腹肌运动+超声波治疗组的立位体前屈活动幅度(2.35 cm)显著低于超声波治疗组(6.23 cm)(p<0.05)。腰腹肌运动+超声波治疗组的屈伸肌总功和屈伸肌峰值力矩比显著高于超声波治疗组(p<0.05)。腰腹肌运动+超声波治疗组的Oswestry功能障碍指数问卷表(ODI)评分显著低于超声波治疗组(p<0.05)。治疗4周后,腰腹肌运动+超声波治疗组的血清超氧化物歧化酶(SOD)和过氧化氢酶(CAT)水平显著高于超声波治疗组,而丙二醛(MDA)水平显著低于超声波治疗组(p<0.05)。为了进一步考察运动联合超声波疗法对下腰痛的治疗机制,本研究建立了完全弗氏佐剂诱导的腰椎间盘退变大鼠模型。采用阿利新蓝染色检测大鼠椎间盘纤维环区和髓核区蛋白多糖的水平,并采用免疫组化染色检测蛋白聚糖和Ⅱ型胶原的表达,发现运动联合超声波治疗可明显提高大鼠蛋白多糖、Ⅱ型胶原和蛋白聚糖水平。本研究表明,与超声波治疗相比,腰腹肌运动联合超声波治疗可更大程度地降低非特异性下腰痛患者的疼痛,提高肌肉功能和腰椎功能,增强血清抗氧化能力,并减少氧化应激损伤。此外,该联合疗法可明显提高腰椎间盘退变大鼠椎间盘中的蛋白多糖、Ⅱ型胶原和蛋白聚糖水平。     

Effect of position-fixing interval on estimated swimming speed and movement pattern of fish tracked with a stationary positioning system

Ultrasonic telemetry using stationary positioning systems allows several fish to be tracked simultaneously, but systems that are incapable of sampling multiple frequencies simultaneously can record data from only one transmitter (individual) at a time. Tracking several individuals simultaneously thus results in longer intervals between successive position fixes for each fish. This deficiency leads to loss of detail in the tracking data collected, and may be expected to cause loss of accuracy in estimates of the swimming speeds and movement patterns of the fish tracked. Even systems that track fish on multiple frequencies are not capable of continuous tracking due to technical issues. We determined the swimming speed, area occupied, activity rhythm and movement pattern of cod (Gadus morhua) using a stationary single-channel positioning system, and analysed how estimates of these behavioural parameters were affected by the interval between successive position fixes. Single fish were tracked at a time, and position fixes were eliminated at regular intervals in the original data to generate new data sets, as if they had been collected in the course of tracking several fish (2–16). In comparison with the complete set, these data sets gave 30–70% decreases in estimates of swimming speed depending on the number of fish supposedly being tracked. These results were similar for two individuals of different size and activity level, indicating that they can be employed as correction factors to partly compensate for underestimates of swimming speed when several fish are tracked simultaneously. Tracking `several' fish only slightly affected the estimates of area occupied (1–15%). The diurnal activity rhythm was also similar between the data sets, whereas details in search pattern were not seen when several fish were tracked simultaneously.     

Effect of selective logging on forest structure and nutrient cycling in a seasonally dry Brazilian Atlantic forest

Aim The Brazilian Atlantic forest covers c. 10% of its original extent, and some areas are still being logged. Although several ecological studies in Atlantic forest have been published over the past two to three decades, there has been little research on forest dynamics and there is a particular lack of information on the effects of disturbance. The aim of the present study was to assess the impact of selective logging on forest structure, floristic composition soil nutrients, litterfall and litter layer in a seasonally dry Atlantic forest. Location The Mata do Carvão is located in the Guaxindiba Ecological Reserve in São Francisco do ltabapoana district (21°24′ S, 41°04′ W), Rio de Janeiro, Brazil. Methods Four plots (50 × 50 m) were set up in 1995 in each of two stands: unlogged and logged. In each plot, all trees ≥ 10 cm d.b.h. were enumerated, identified and measured. Vouchers were lodged at UENF Herbarium. Five surface soil samples were collected in each plot in the dry season (in October 1995). Litterfall was collected in eight traps (0.50 m²) in each plot over a year from 14 November 1995 to 11 November 1996. The litter layer was sampled in eight quadrats (0.25 m²) in each plot in the dry and wet seasons. Soils were air‐dried, sieved, and chemically analysed. The litter was dried (80 °C), sorted into six fractions, weighed and bulked samples analysed for nutrients. Results Forest stands did not differ in stem density and total basal area, with a total of 1137 individuals sampled in 1996 (564 unlogged and 573 logged), and a total basal area of 15 m² (unlogged) and 13.0 m² (logged). However, unlogged stands had more large trees (≥ 30 cm in d.b.h.) and greater mean canopy height. Among the families, Rutaceae and Leguminosae were the most abundant families in both sites, although the Rutaceae had a higher density in unlogged and Leguminosae in the logged stand. The species diversity index was similar between stands. Late‐successional species, such as Metrodorea nigra var. brevifolia and Paratecoma peroba, were less abundant in the logged stand. Selective logging did not affect nutrient concentrations in the soil or in the litter. However, quantities of the nutrients in the total litterfall and in the leaf litterfall and litter layer were higher in unlogged than in logged stands, mainly as a result of fallen M. nigra leaves. Metrodorea nigra was considered a key species in the nutrients dynamics in Carvão forest. Main conclusions Despite the fact that effects on tree diversity and soil nutrients were not clear, selective logging in this Atlantic forest altered canopy structure, increased the relative abundance of some early‐secondary species and decreased the litter input and stock of nutrients. Detailed information on the influence of logging on the distribution and structure of plant populations and in nutrient processes is fundamental for a sustainable logging system to be developed.     

二术二陈汤联合有氧运动、阻抗运动对2型糖尿病患者心肺功能、血糖控制效果的观察

摘要 目的：探究二术二陈汤联合有氧运动、阻抗运动对2型糖尿病患者心肺功能、血糖控制效果。方法：选择2017年5月~2022年7月本院收治的60例2型糖尿病患者为本次研究对象,随机数字表法分组,观察组,n=30,对照组,n=30。对照组进行基础治疗,对照组用药基础上,联合二术二陈汤+有氧及阻抗运动治疗观察组。比较心肺功能、血管内皮功能、血糖控制效果、不良反应。结果：治疗后,观察组舒张末期容积（EDV）、左室收缩末期容积（ESV）、内皮素-1（ET-1）显著低于对照组,而一氧化氮（NO）、内皮依赖性血管舒张功能（FMD）、1 s用力呼气容积（FEV₁）、FEV₁/FVC显著高于对照组（P＜0.05）;治疗后,空腹血糖（FBG）、餐后2 h血糖（2hPBG）、糖化血红蛋白（HbA1c）指标水平,与治疗前比较,观察组及对照组均降低,且观察组低于对照组（P＜0.05）;观察组不良反应率为20.00 %,对照组不良反应率为23.33 %,观察组与对照组比较无差异（P＞0.05）。结论：二术二陈汤联合有氧运动、阻抗运动可有效提升2型糖尿病患者心肺功能,改善血管内皮功能,降低血糖水平,且安全性较高。     

The potential antioxidant effect of raloxifene treatment: a study on heart, liver and brain cortex of ovariectomized female rats

The antioxidant activity of some compounds buffer the free radicals generated either endogenously or exogenously, thus decreasing the potential damage mediated by oxidation. Recent studies documented that raloxifene has antioxidant properties in vitro. However, there are limited animal studies available to show raloxifene's antioxidant properties. We aimed to investigate the effects of raloxifene on antioxidant enzymes such as SOD, CAT and GPX, TrxR and the levels of GSH and MDA in heart, liver and brain cortex of ovariectomized female rats. Female Sprague Dawley rats weighing 300-350 g (n=24) were divided into three groups: (I) Eight non-ovariectomized rats were used as naive controls without any treatment (non-ovariectomized group, n=8). Five weeks after ovariectomy, (II) Ovariectomized placebo group (n=8) was given physiological saline, and (III) Raloxifene group (n=8) was given raloxifene 1 mg/kg sc. daily for 12 days. Ovariectomy induced significant increases on SOD, GPX, CAT activity and MDA levels in brain, heart and liver tissues compared to non-ovariectomized rats ( p<0.05). Raloxifene treatment led to decreased levels of SOD activity in heart, GPX activity in brain and CAT activity in liver tissue when compared to ovariectomized group ( p<0.05) but there was no change in activity of TrxR in all groups. The levels of MDA in brain, heart and liver tissues increased in ovariectomized group when compared to non-ovariectomized rats ( p<0.05). Raloxifene had a significant attenuating effect on the levels of MDA in brain and heart tissues. Our results also indicate that the levels of GSH in brain, heart and liver tissue decreased when compared to non-ovariectomized rats. Raloxifene treatment was observed to significantly increase the levels of GSH in brain and heart tissues ( p<0.05). However, there were insignificant differences for the GSH levels in liver tissues of ovariectomized placebo or raloxifene groups. In conclusion, our results demonstrate that raloxifene may be more effective against oxidative stress in heart and brain than in liver tissue.     

The Expression of Nerve Growth Factor Receptor on Schwann Cells and the Effect of These Cells on Regeneration of Axons in Traumatically Injured Human Spinal Cord

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The Brazil SimSmoke Policy Simulation Model: The Effect of Strong Tobacco Control Policies on Smoking Prevalence and Smoking-Attributable Deaths in a Middle Income Nation

Background

Brazil has reduced its smoking rate by about 50% in the last 20 y. During that time period, strong tobacco control policies were implemented. This paper estimates the effect of these stricter policies on smoking prevalence and associated premature mortality, and the effect that additional policies may have.

Methods and Findings

The model was developed using the SimSmoke tobacco control policy model. Using policy, population, and smoking data for Brazil, the model assesses the effect on premature deaths of cigarette taxes, smoke-free air laws, mass media campaigns, marketing restrictions, packaging requirements, cessation treatment programs, and youth access restrictions. We estimate the effect of past policies relative to a counterfactual of policies kept to 1989 levels, and the effect of stricter future policies. Male and female smoking prevalence in Brazil have fallen by about half since 1989, which represents a 46% (lower and upper bounds: 28%–66%) relative reduction compared to the 2010 prevalence under the counterfactual scenario of policies held to 1989 levels. Almost half of that 46% reduction is explained by price increases, 14% by smoke-free air laws, 14% by marketing restrictions, 8% by health warnings, 6% by mass media campaigns, and 10% by cessation treatment programs. As a result of the past policies, a total of almost 420,000 (260,000–715,000) deaths had been averted by 2010, increasing to almost 7 million (4.5 million–10.3 million) deaths projected by 2050. Comparing future implementation of a set of stricter policies to a scenario with 2010 policies held constant, smoking prevalence by 2050 could be reduced by another 39% (29%–54%), and 1.3 million (0.9 million–2.0 million) out of 9 million future premature deaths could be averted.

Conclusions

Brazil provides one of the outstanding public health success stories in reducing deaths due to smoking, and serves as a model for other low and middle income nations. However, a set of stricter policies could further reduce smoking and save many additional lives. Please see later in the article for the Editors'' Summary     

Voltage Gating of Shaker K+ Channels : The Effect of Temperature on Ionic and Gating Currents

Ionic (I_i) and gating currents (I_g) from noninactivating Shaker H4 K⁺ channels were recorded with the cut-open oocyte voltage clamp and macropatch techniques. Steady state and kinetic properties were studied in the temperature range 2–22°C. The time course of I_i elicited by large depolarizations consists of an initial delay followed by an exponential rise with two kinetic components. The main I_i component is highly temperature dependent (Q₁₀ > 4) and mildly voltage dependent, having a valence times the fraction of electric field (z) of 0.2–0.3 e_o. The I_g On response obtained between −60 and 20 mV consists of a rising phase followed by a decay with fast and slow kinetic components. The main I_g component of decay is highly temperature dependent (Q₁₀ > 4) and has a z between 1.6 and 2.8 e_o in the voltage range from −60 to −10 mV, and ∼0.45 e_o at more depolarized potentials. After a pulse to 0 mV, a variable recovery period at −50 mV reactivates the gating charge with a high temperature dependence (Q₁₀ > 4). In contrast, the reactivation occurring between −90 and −50 mV has a Q₁₀ = 1.2. Fluctuation analysis of ionic currents reveals that the open probability decreases 20% between 18 and 8°C and the unitary conductance has a low temperature dependence with a Q₁₀ of 1.44. Plots of conductance and gating charge displacement are displaced to the left along the voltage axis when the temperature is decreased. The temperature data suggests that activation consists of a series of early steps with low enthalpic and negative entropic changes, followed by at least one step with high enthalpic and positive entropic changes, leading to final transition to the open state, which has a negative entropic change.     

糖尿病病理性神经痛大鼠坐骨神经中miR-133a的上调对疼痛阈值的影响及机制

摘要 目的：探究糖尿病病理性神经痛大鼠坐骨神经中miR-133a的上调对疼痛阈值的影响及机制。方法：使用NGS测序和定量PCR分析糖尿病病理性神经痛大鼠坐骨神经中的相关 miRNA表达,预测潜在下游目标。使用miR-133a-3p转染的 RSC96细胞进行体外实验。使用微蛋白质印迹和蛋白质印迹以及免疫荧光分析验证miR-133a-3p的作用。使用miR-133a-3p拮抗剂分析miR-133a-3p与DNP之间的关联。结果：miR-133a-3p模拟物增加了RSC96细胞中VEGFR-2、p38αMAPK、TRAF-6和PIAS3的表达,并降低了NFκB p50和MKP3的表达（P＜0.05）。在正常大鼠中,AAV-miR-133a-3p通过神经内注射到坐骨神经中可诱导机械性异常性疼痛和p-p38 MAPK激活（P＜0.05）。在DM大鼠中,miR-133a-3p 拮抗剂给药可减轻DNP并下调p-p38磷酸化（P＜0.05）。结论：坐骨神经中miR-133a-3p的过度表达会引起这种疼痛,miR-133a-3p可能是患有神经性疼痛的患者的有用治疗靶点。     

The Effect of Seed-Borne Pathogens on Emergence of Globe Amaranth, Calendula and Tagetes and the Methods of Control

Nimbya gomphrenae , Stemphylium vesicarium and Alternaria tagetica were isolated for the first time from seeds of diseased globe amaranth ( Gomphrena globosa ), pot marigold ( Calendula officinalis ) and marigold ( Tagetes erecta ), respectively, in Taiwan. The amount of seed-borne N. gomphrenae or Colletotrichum dematium was positively correlated (P=0.05) with the amount of the abnormal seedling and unemergent seed of globe amaranth. Similarly, the amount of seed-borne Alternaria alternata or S. vesicarium was negatively correlated (P=0.05) with the emergent rate of pot marigold. Treating the fungi-contaminated globe amaranth seeds with Bacillus megaterium [1.3 × 10⁹colony-forming units (CFU)/ml] or 1% NaOCl significantly (P=0.05) increased seed emergence over control whereas 10 p.p.m. pyrifenox could control N. gomphrenae on globe amaranth. Stemphylium -contaminated pot marigold seeds responded to 200 p.p.m. iprodione treatment by increasing significantly (P=0.05) in seed emergence over untreated control. For seed-borne A. tagetica , treating marigold seeds with Bacillus azotoformanis (1 × 10⁹CFU/ml) was found effective and mancozeb highly effective.