In this work, we
reported a multi-responsive luminescent hydrogel
with properties of encryption, naked eye sensing of glucose, shape
memory, self-healing, and antibacterial activity. The hydrogel (GA/CCS/DNSA/Eu3+) was obtained by mixing phenylboronic acid-modified gelatin
(GA-DBA), catechol-modified carboxymethyl chitosan (CCS-PCA), 3,5-dinitrosalicylic
acid (DNSA), and Eu3+ ions through a facile heating–cooling
process. The resultant hydrogel exhibits reversible luminescence and
color and phase changes in response to temperature, acid/base, salt,
and redox stimuli. Based on the multiple responsiveness, information
encryption and decryption, naked eye sensing of glucose, remarkable
shape memory, and enhanced mechanical properties of the as-prepared
hydrogel were realized. In addition, the self-healing capacity was
also achieved due to the dynamic bonds in GA/CCS/DNSA/Eu3+ hydrogels. Specifically, the GA/CCS/DNSA/Eu3+ hydrogels
possess antibacterial activity owing to the bacteriostasis of the
CCS-PCA and DNSA/Eu3+ complex. Thus, GA/CCS/DNSA/Eu3+ hydrogels have potential applications in the fields of anticounterfeiting,
wearable devices, biomedicine, sensing, etc.
Purpose To investigate the effect of sevoflurane preconditioning on
ischemia/reperfusion (I/R)-induced pulmonary/hepatic injuryMethods Fifty-one Wistar rats were randomly grouped into sham, I/R, and sevoflurane
groups. After reperfusion, the structural change of the lung was measured by
Smith score, the wet and dry weights (W/D) were determined, malondialdehyde
(MDA) myeloperoxidase (MPO) content was determined colorimetrically and by
fluorescence, respectively, and matrix metalloprotein-9 (MMP-9) mRNA was
quantified by RT-PCR. Biopsy and morphological analyses were performed on
liver tissue, activities of aspartate aminotransferase (AST) and alanine
aminotransferase (ALT) were determined, and tumor necrosis factor-alpha
(TNF-α) level was determined.Results The sham group showed no changes in tissue structure. Structural lesions in
the sevoflurane and I/R groups were mild and severe, respectively. Smith
score, W/D, MDA, MPO, and MMP mRNA showed the same trend, and were increased
in the I/R group and recovered in the sevoflurane group, compared with the
sham group (both P<0.05). AST and ALT were significantly increased
compared to the sham group (AST: 655±52.06 vs . 29±9.30
U/L; ALT: 693±75.56 vs . 37±6.71 U/L; P<0.05). In the
sevoflurane group, AST and ALT levels were significantly decreased
(464±47.71 and 516±78.84 U/L; P<0.001). TNF-α presented similar
results.Conclusion The protection of lung and liver by sevoflurane may be mediated by inhibited
leukocyte recruitment and MMP-9 secretion.
To solve the current problems of waste classification and littering, this kind of BearPi-based waste bin with the functions of speech-controlled classification and locating is invented using the technologies of speech recognition and GPS. The device, with BearPi as its core element, uses solar panels and lithium batteries as power supply, IIC and serial interfaces for the respective control of PCA9685 steering gear driving board, an M5310_A communication module, ATGM332D locating module and SX-ASR-B speech recognition module, and finally, a GPIO and timer for the operation of the HC-SR04 module and an E18-D80NK photoelectric sensor. The devices could classify the waste through speech recognition or leave it for the users. Furthermore, it could detect the remaining capacity and location of the waste bins through the modules and update the cloud data for the users’ convenience in finding and using.
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