DNA polymerases from the extremely thermophilic bacterium Thermus thermophilus HB-8

Three DNA polymerase isoenzymes, which have been called A, B and C, were purified from Thermus thermophilus HB-8. These enzymes can be separated by chromatography (pH 7.5) on phosphocellulose and DNA-agarose. Their relative molecular masses, as determined by glycerol gradient centrifugation, fall in the range of 110000-120000. The three of them are devoid of exonuclease activity. Species A, B and C differ in their sensitivity towards N-ethylmaleimide (A greater than B greater than C) and urea (A greater than B = C) and also in their stability at high temperature (90 degrees C) (B greater than C greater than A). In addition, these enzymes can be distinguished utilizing various templates under different conditions. Thus, with activated DNA and Mg2+ as a cofactor, the highest incorporation is obtained at 50 degrees C with enzyme A and at 63 degrees C with enzymes B and C. If Mg2+ is replaced by Mn2+, the optimal temperatures remain unchanged, but enzyme A is stimulated twofold, while the activities of enzymes B and C decrease to one-half. On the other hand, with either poly(dA) X (dT)10 or poly(dA-dT) and Mg2+, enzyme A is inactive and enzyme C is severalfold more active than enzyme B. With the former synthetic template, optimal temperatures are 50 degrees C (enzyme C) and 40 degrees C (enzyme B), while with poly(dA-dT) they both work best at 63 degrees C. In turn, only enzyme C is able to utilize poly(rA) X (dT)10, although only with Mn2+ as a cofactor.

Cognitive stimulation and cognitive results in older adults: A systematic review and meta-analysis

BACKGROUND AND PURPOSE

The lack of cognitive activity accelerates age cognitive decline. Cognitive stimulation (CS) tries to enhance cognitive functioning. The purpose of this systematic review and meta-analysis was to evaluate the effects of CS on cognitive outcomes (general cognitive functioning and specific cognitive domains) in older adults (aged 65 years or older, cognitively healthy participants, or with mild cognitive impairment, or dementia).

METHODS

PubMed, Scopus and Web of Science databases were examined from inception to October 2021. A total of 1,997 studies were identified in these databases, and. 33 studies were finally included in the systematic review and the meta-analysis. Raw means and standard deviations were used for continuous outcomes. Publication bias was examined by Egger's Regression Test for Funnel Plot Asymmetry and the quality assessment tools from the National Institutes of Health.

RESULTS

CS significantly improves general cognitive functioning (mean difference=MD = 1.536, 95%CI, 0.832 to 2.240), memory (MD = 0.365, 95%CI, 0.300 to 0.430), orientation (MD = 0.428, 95%CI, 0.306 to 0.550), praxis (MD = 0.278, 95%CI, 0.094 to 0.462) and calculation (MD = 0.228, 95%CI, 0.112 to 0.343).

CONCLUSION

CS seems to increase general cognitive functioning, memory, orientation, praxis, and calculation in older adults.

Effectiveness of dry needling for upper extremity spasticity, quality of life and function in subacute phase stroke patients

BACKGROUND

Stroke is the fourth leading cause of death in Europe, represents one of the most common causes of disability in adult patients, and involves considerable short- and long-term social and healthcare costs. The effectiveness of deep dry needling (DDN) on affected arm functionality was assessed throughout 8 weeks of treatment in patients with stroke in the subacute phase.

METHODS

Eighty patients were included in this two-group non-randomised study after a propensity score analysis was carried out. Both groups received standard physiotherapy treatment on the affected arm. The needling group also received six sessions of DDN during the 8-week period. Patients were evaluated before and after each session using the Fugl-Meyer upper extremity (FM UE) scale, the modified modified Ashworth scale (MMAS), the resistance to passive movement scale (REPAS) and a 10-point numeric pain rating scale (NPRS 10). The Brunnstrom recovery stage was recorded at the beginning and at the end of the study, and the EuroQoL quality of life survey was completed at the beginning of the study, after the first month of treatment and at the end of the study.

RESULTS

Patients treated with DDN showed a reduction in spasticity measured using the REPAS (p < 0.001) and the MMAS (p < 0.05). There was also an improvement in the Brunnstrom recovery stages (p < 0.05).

CONCLUSION

The addition of a specific DDN treatment to a standard physiotherapy treatment appeared to lead to a higher reduction in spasticity in the affected arm; however, it did not provide additional changes in functionality, pain and quality of life. Further studies with a randomised controlled trial design are required to confirm our findings.

Cost-effectiveness of upper extremity dry needling in the rehabilitation of patients with stroke

INTRODUCTION

Dry needling (DN) has been shown to be effective for the treatment of upper extremity hypertonia in patients with stroke.

PURPOSE

To evaluate the cost-effectiveness of DN in patients with stroke.

METHODS

A cost-effectiveness analysis was performed in a research study conducted at a Spanish public hospital where patients were classified into two groups with or without DN. Hypertonia was measured using the Modified Modified Ashworth Scale (MMAS), and quality of life (QOL) was assessed using the EuroQoL 5-dimension questionnaire. Data regarding the effects and costs of physiotherapy were presented by calculating the mean and 95% confidence interval. The health outcomes were evaluated considering the rate of responders to the treatment based on the MMAS. Spanish preference weights were used to estimate quality-adjusted life years (QALYs). The incremental cost-effectiveness ratio (ICER) and incremental cost-utility ratio (ICUR) were calculated to determine the economic value of DN.

RESULTS

Eighty patients with stroke in the subacute stage of recovery were selected to participate in this study. Based on the rate of responders, the ICER of the DN group was very low. Despite the sensitivity analysis performed, the results of the ICUR were not encouraging.

DISCUSSION

Cost-effectiveness with responder rate results were favourable for the DN group and were confirmed by the sensitivity analysis according to levels of care. In addition, our findings revealed that 4 weeks of treatment could be more cost-effective than 8 weeks. DN treatment of the upper extremity appears to be cost-effective based on the rate of responders measured using the MMAS scale.

Vibron-assisted spin excitation in a magnetically anisotropic molecule

The electrical control and readout of molecular spin states are key for high-density storage. Expectations are that electrically-driven spin and vibrational excitations in a molecule should give rise to new conductance features in the presence of magnetic anisotropy, offering alternative routes to study and, ultimately, manipulate molecular magnetism. Here, we use inelastic electron tunneling spectroscopy to promote and detect the excited spin states of a prototypical molecule with magnetic anisotropy. We demonstrate the existence of a vibron-assisted spin excitation that can exceed in energy and in amplitude a simple excitation among spin states. This excitation, which can be quenched by structural changes in the magnetic molecule, is explained using first-principles calculations that include dynamical electronic correlations.

Safety of airway clearance combined with bronchodilator and hypertonic saline in non-hospitalized infants with acute bronchiolitis

BACKGROUND

Acute viral bronchiolitis (AVB) is associated with significant morbidity and no study has addressed the safety of airway clearance techniques (ACT) for non-hospitalized infants. This study aimed to evaluate the safety of the use of ACT combined with bronchodilator and hypertonic saline in non-hospitalized children with the first episode of AVB.

METHODS

A quasi-experimental study of infants aged 2-12 months, with a clinical diagnosis of AVB (mild to moderate), was performed. The Wang score, breathing frequency, oxygen saturation (SpO₂), heart rate (HR), and the presence of adverse events were evaluated before, 10 and 20 min after the application of a protocol including ACT (nasal irrigation, prolonged slow expiration, and provoked cough), bronchodilator and hypertonic saline inhalation. A total of 265 infants, mean age 6.86±3.01 months, were included.

RESULTS

A reduction (p<0.001) in the Wang score and in the breathing frequency as well as an increase in SpO₂ were found. There was also a transient HR increment at 10 min followed by a reduction at 20 min (p<0.05). The proportion of patients presenting with chest retraction and wheezing decreased (p<0.001) after treatment. Most of the children (88.3%) did not experience adverse events. A post-treatment increment (p<0.001) of patients classified as having normal values, as well as a decrease in those with mild and moderate AVB, was found for the Wang score levels.

CONCLUSION

The use of ACT combined with bronchodilator and hypertonic saline was safe, immediately after treatment, for non-hospitalized children with mild to moderate AVB. No clinically important deterioration or adverse events were identified in the follow-up period.

Effectiveness of Personalized Cognitive Stimulation in Older Adults with Mild Possible Cognitive Impairment: A 12-month Follow-up Cognitive Stimulation in Mild Cognitive Impairment

OBJECTIVE

The objective of this study was to analyze the long-term effects of a personalized cognitive stimulation (PCS) program on the global cognition, cognitive aspects, activities of daily living (ADLs), anxiety, and depression in older adults with possible mild cognitive impairment (MCI).

METHODS

A 12-month follow-up analysis was carried out in a single-blind, randomized clinical trial to research the long-term effects of a 10-week PCS program evaluating the cognitive level, depression, and anxiety of older adults with possible MCI.

RESULTS

Fifty older adults were assessed 12 months after the CS program, 23 in the intervention group and 27 in the control group. There were significant differences between the groups at 12 months in the global cognition (p = .002), in global orientation (p < .001), and in spatial orientation (p = .004) in favor of the intervention group, measured with the Spanish version of the Mini-Mental Status Examination (MEC-35).

CONCLUSIONS

A PCS program could be effective in improving global cognition and global and spatial orientation.

CLINICAL IMPLICATIONS

A PCS program based on cognitive levels in older adults with possible MCI achieves improvements in global cognition and global and spatial orientation. PCS programs can be applied successfully by trained occupational therapists.