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2,793 results on '"Li, Baohua"'

1. Monolithic Germanium Tin on Si Avalanche Photodiodes

Author

Rudie, Justin, Amoah, Sylvester, Wang, Xiaoxin, Kumar, Rajesh, Abernathy, Grey, Akwabli, Steven, Grant, Perry C., Liu, Jifeng, Li, Baohua, Du, Wei, and Yu, Shui-Qing

Subjects
Condensed Matter - Materials Science
Abstract

We demonstrate monolithically grown germanium-tin (GeSn) on silicon avalanche photodiodes (APDs) for infrared light detection. A relatively thinner Ge buffer design was adopted to allow effective photo carriers to transport from the GeSn absorber to the Si multiplication layer such that clear punch-through behavior and a saturated primary responsivity of 0.3 A/W at 1550 nm were observed before avalanche breakdown in GeSn/Si APDs for the first time. The spectral response covers 1500 to 1700 nm. The measured punch-through and breakdown voltages are 15 and 17 V, respectively. Undisputed multiplication gain was obtained with the maximum value of 4.5 at 77 K, and 1.4 at 250 K, directly in reference to the saturated primary responsivity from the same device rather than a different GeSn p-i-n photodiode in previous reports. A peak responsivity was measured as 1.12 A/W at 1550 nm and 77 K., Comment: 8 pages, 5 figures, invited paper

Published
2024

2. Electrically Injected mid-infrared GeSn laser on Si operating at 140 K

Author

Acharya, Sudip, Stanchu, Hryhorii, Kumar, Rajesh, Ojo, Solomon, Benamara, Mourad, Chang, Guo-En, Li, Baohua, Du, Wei, and Yu, Shui-Qing

Subjects
Physics - Optics, Physics - Applied Physics
Abstract

Owing to its true direct bandgap and tunable bandgap energies,GeSn alloys are increasingly attractive as gain media for mid-IR lasers that can be monolithically integrated on Si. Demonstrations of optically pumped GeSn laser at room under pulsed condition and at cryogenic temperature under continuous-wave excitation show great promise of GeSn lasers to be efficient electrically injected light sources on Si. Here we report electrically injected GeSn lasers using Fabry-Perot cavity with 20, 40, and 80 micron ridge widths. A maximum operating temperature of 140 K with lasing threshold of 0.756 kA/cm2 at 77 K and emitting wavelength of 2722 nm at 140 K was obtained. The lower threshold current density compared to previous works was achieved by reducing optical loss and improving the optical confinement. The peak power was measured as 2.2 mW/facet at 77 K.

Published
2024

3. Regulatory role of PI3K/AKT pathway in diabetic retinopathy

Author

Li Baohua, Kang Zefeng, Hou Xinyue, Wang Jianquan, Song Man, Li Danyu, Liu Mengyu, and Yan Xin

Subjects
pi3k/akt pathway, diabetic retinopathy, neurodegenerative disease, microangiopathy, Ophthalmology, RE1-994
Abstract

Diabetic retinopathy(DR)is one of the major complications of diabetes mellitus, characterized by neurodegeneration and microangiopathy. Currently, the treatment of DR is mainly focused on the management of late complications and has not achieved the desired clinical outcome. Evidence suggests that the PI3K/AKT pathway, as one of the important intracellular signaling pathways during the cell cycle, is involved in the whole process of DR pathogenesis. This article focuses on the structural composition, activation and blocking pathways, conduction pathways, regulatory mechanisms and biological functions of the PI3K/AKT signaling pathway to review its role in DR and to explore the potential of targeting the PI3K/AKT pathway for the treatment of DR.

Published
2024
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10. Designing lithium halide solid electrolytes

Author

Wang, Qidi, Zhou, Yunan, Wang, Xuelong, Guo, Hao, Gong, Shuiping, Yao, Zhenpeng, Wu, Fangting, Wang, Jianlin, Ganapathy, Swapna, Bai, Xuedong, Li, Baohua, Zhao, Chenglong, Janek, Jürgen, and Wagemaker, Marnix

Published
2024
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13. The trans-regulatory landscape of gene networks in plants

Author

Hummel, Niklas FC, Zhou, Andy, Li, Baohua, Markel, Kasey, Ornelas, Izaiah J, and Shih, Patrick M

Subjects
Biochemistry and Cell Biology, Bioinformatics and Computational Biology, Biological Sciences, Biotechnology, Human Genome, Genetics, Underpinning research, 1.1 Normal biological development and functioning, Generic health relevance, Gene Regulatory Networks, Arabidopsis, Transcription Factors, Arabidopsis Proteins, gene regulatory networks, plant synthetic biology, transcription factor, Biochemistry and cell biology
Abstract

The transcriptional effector domains of transcription factors play a key role in controlling gene expression; however, their functional nature is poorly understood, hampering our ability to explore this fundamental dimension of gene regulatory networks. To map the trans-regulatory landscape in a complex eukaryote, we systematically characterized the putative transcriptional effector domains of over 400 Arabidopsis thaliana transcription factors for their capacity to modulate transcription. We demonstrate that transcriptional effector activity can be integrated into gene regulatory networks capable of elucidating the functional dynamics underlying gene expression patterns. We further show how our characterized domains can enhance genome engineering efforts and reveal how plant transcriptional activators share regulatory features conserved across distantly related eukaryotes. Our results provide a framework to systematically characterize the regulatory role of transcription factors at a genome-scale in order to understand the transcriptional wiring of biological systems.

Published
2023

46. Downregulation of lncRNA XLOC_032768 in diabetic patients predicts the occurrence of diabetic nephropathy

Author

Li Baohua, Wu ZhiLe, Xu Haofeng, Ye HuiLing, and Yang Xin

Subjects
xloc_032768, diabetic nephropathy, type 2 diabetes, diagnosis, prediction, Medicine
Abstract

LncRNA XLOC_032768 is reported to prevent renal tubular epithelial cells from cisplatin-induced apoptosis, suggesting its involvement in the development of kidney injury. The present study aimed to explore the role of XLOC_032768 in diabetic nephropathy (DN). The present study enrolled a total of 140 healthy controls (Control group) and 140 patients with type 2 diabetes (Diabetes group). Expression of XLOC_032768 in plasma from these participants was analyzed by performing RT-qPCR. The 140 diabetic patients were followed up for 5 years to monitor the occurrence of diabetic complications. The role of XLOC_032768 in predicting the occurrence of diabetic complications, including DN, diabetic cardiomyopathy (DC), diabetic retinopathy (DR), and diabetic foot (DF) were analyzed by plotting receiver operating characteristic curves and complication-free curves. On the day of admission, plasma levels of XLOC_032768 were not significantly different between Control and Diabetes groups. During follow-up, a total of 22, 15, 13, and 15 cases were diagnosed as DN, DC, DR, and DF, respectively. On the day of diagnosis, plasma levels of XLOC_032768 were only decreased in DN group, but not in other groups, compared to plasma levels of XLOC_032768 on the day of admission. Using plasma levels of XLOC_032768 on the day of admission as a biomarker, potential DN patients were effectively separated from patients with other potential complications and diabetic patients without complications. The 140 diabetic patients were grouped into high and low XLOC_032768 level groups. It was observed that low XLOC_032768 level group showed increased occurrence of DN, but not other complications, compared to high XLOC_032768 level group. Therefore, the downregulation of lncRNA XLOC_032768 in diabetic patients may predict the occurrence of DN.

Published
2024
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