COVID-19 in hospitalized infants aged under 3 months: multi-center experiences across Turkey.

To investigate coronavirus disease 2019 (COVID-19) in infants aged 0 to 3 months because there is currently a significant gap in the literature on the subject. A cross-sectional study was conducted with the involvement of 19 medical centers across Turkey and 570 infants. The majority of the patients were male (58.2%), and the three most common symptoms were fever (78.2%), cough (44.6%), and feeding intolerance (39.9%). The results showed that a small percentage of infants had positive blood (0.9%) or urine cultures (10.2%). Most infants presented with fever (78.2%). Children without underlying conditions (UCs) had mostly a complicated respiratory course and a normal chest radiography. Significant more positive urine culture rates were observed in infants with fever. A higher incidence of respiratory support requirements and abnormal chest findings were seen in infants with chronic conditions. These infants also had a longer hospital stay than those without chronic conditions.  Conclusions: Our study discloses the clinical observations and accompanying bacterial infections found in infants aged under 3 months with COVID-19. These findings can shed light on COVID-19 in infancy for physicians because there is limited clinical evidence available. What is Known: • COVID-19 in infants and older children has been seen more mildly than in adults. • The most common symptoms of COVID-19 in infants are fever and cough, as in older children and adults. COVID-19 should be one of the differential diagnoses in infants with fever. What is New: • Although most infants under three months had fever, the clinical course was uneventful and respiratory complications were rarely observed in healthy children. • Infants with underlying conditions had more frequent respiratory support and abnormal chest radiography and stayed longer in the hospital.

A snapshot of pediatric inpatients and outpatients with COVID-19: a point prevalence study from Turkey.

This multi-center point prevalence study evaluated children who were diagnosed as having coronavirus disease 2019 (COVID-19). On February 2nd, 2022, inpatients and outpatients infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) were included in the study from 12 cities and 24 centers in Turkey. Of 8605 patients on February 2nd, 2022, in participating centers, 706 (8.2%) had COVID-19. The median age of the 706 patients was 92.50 months, 53.4% were female, and 76.7% were inpatients. The three most common symptoms of the patients with COVID-19 were fever (56.6%), cough (41.3%), and fatigue (27.5%). The three most common underlying chronic diseases (UCDs) were asthma (3.4%), neurologic disorders (3.3%), and obesity (2.6%). The SARS-CoV-2-related pneumoniae rate was 10.7%. The COVID-19 vaccination rate was 12.5% in all patients. Among patients aged over 12 years with access to the vaccine given by the Republic of Turkey Ministry of Health, the vaccination rate was 38.7%. Patients with UCDs presented with dyspnea and pneumoniae more frequently than those without UCDs (p < 0.001 for both). The rates of fever, diarrhea, and pneumoniae were higher in patients without COVID-19 vaccinations (p = 0.001, p = 0.012, and p = 0.027).  Conclusion: To lessen the effects of the disease, all eligible children should receive the COVID-19 vaccine. The illness may specifically endanger children with UCDs. What is Known: • Children with COVID-19 mainly present with fever and cough, as in adults. • COVID-19 may specifically threaten children with underlying chronic diseases. What is New: • Children with obesity have a higher vaccination rate against COVID-19 than children without obesity. • Among unvaccinated children, fever and pneumoniae might be seen at a higher ratio than among vaccinated children.

Cold-induced Vascular Changes in the Macula, Optic Disc and Choroid in Children with Raynaud's Phenomena.

AIM: To investigate changes in retinal and choroidal vessels in children with primary and secondary raynaud's phenomena(RP). METHODS: Measurements were performed by optic coherence tomography angiography before as well as during and 10 minutes after the immersion of one hand in ice water. RESULTS: Primary RP patients exhibited enlargement of the foveal avascular region and decrease in vessel density in the parafoveal superficial capillary plexus (SCP) during cold exposure, but values returned to normal when the hands were removed from the cold water. In children with secondary RP, there were decreases in choroidal thickness and vessel density in the SCP and radial peripapillary capillary plexus (RPCP) during cold exposure. Changes in choroid and peripapillary RPCP were still significant 10 minutes after removal from cold water. CONCLUSION: Ocular arteriolar vasospasm seems to be more pronounced in patients with secondary RP, particularly in the choroid and the peripapillary area of the RPCP. CLINICAL TRIAL REGISTRATION NUMBER AND DATE: DECISION NUMBER: 76/1315 - 10.03.2021.

Changes in retinal and choroidal capillary dynamics in patients with multisystem inflammatory syndrome in children.

PURPOSE: To evaluate patients with multisystemic inflammatory syndrome in children (MIS-C) associated with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection using optical coherence tomography angiography (OCTA) during and after resolution of inflammation to investigate the effect of this entity on the retinal and choroidal circulation. METHODS: The study included 38 eyes of 19 patients diagnosed as having MIS-C between March 2021 and June 2021. OCTA measurements of choroidal thickness and vessel density in the radial peripapillary capillary plexus (RPCP), superficial capillary plexus (SCP), and deep capillary plexus (DCP) obtained at time of diagnosis and 60 days later were compared. Correlations between C-reactive protein (CRP) levels at diagnosis and retinochoroidal involvement were investigated. RESULTS: Compared to post-recovery follow-up examinations, patients with active MIS-C showed foveal avascular zone enlargement (p = 0.031), decreased vessel density in the temporal parafoveal SCP (p = 0.047) and all parafoveal areas of the DCP (p < 0.05 for all), and increased choroidal thickness (p = 0.021). Correlation analysis between CRP levels and OCTA changes during MIS-C revealed significant negative correlations with all parafoveal sectors of the SCP and DCP and a significant positive correlation with CT. CONCLUSION: There were especially marked effects on the DCP and choroid in MIS-C patients. Our findings also correlate with CRP levels. The use of optical coherence tomography angiography in patients with multisystemic inflammatory syndrome may have potential future implications for detecting ocular microvascular changes that occur before permanent damage develops. Clinical Trial Registration Number and Date: 77/1340; March 1, 2021.

Production of Inhalable Ultra-Small Particles for Delivery of Anti-Inflammation Medicine via a Table-Top Microdevice.

A table-top microdevice was introduced in this work to produce ultrasmall particles for drug delivery via inhalation. The design and operation are similar to that of spray-drying equipment used in industry, but the device itself is much smaller and more portable in size, simpler to operate and more economical. More importantly, the device enables more accurate control over particle size. Using Flavopiridol, an anti-inflammation medication, formulations have been developed to produce inhalable particles for pulmonary delivery. A solution containing the desired components forms droplets by passing through an array of micro-apertures that vibrate via a piezo-electrical driver. High-purity nitrogen gas was introduced and flew through the designed path, which included the funnel collection and cyclone chamber, and finally was pumped away. The gas carried and dried the micronized liquid droplets along the pathway, leading to the precipitation of dry solid microparticles. The formation of the cyclone was essential to assure the sufficient travel path length of the liquid droplets to allow drying. Synthesis parameters were optimized to produce microparticles, whose morphology, size, physio-chemical properties, and release profiles met the criteria for inhalation. Bioactivity assays have revealed a high degree of anti-inflammation. The above-mentioned approach enabled the production of inhalable particles in research laboratories in general, using the simple table-top microdevice. The microparticles enable the inhalable delivery of anti-inflammation medicine to the lungs, thus providing treatment for diseases such as pulmonary fibrosis and COVID-19.

MIS-C and Visceral Leishmaniasis Co-occurence: Has the Clinic of Other Diseases Masked in the Pandemia?

At the end of 2019, the newly detected severe acute respiratory syndrome-coronavirus (COVID)-2 in China spread rapidly and caused a global epidemic. It has been observed that the virus, which is the cause of COVID-2019 and can cause severe acute respiratory failure, later causes a hyperinflammatory picture and causes a clinical picture similar to Kawasaki disease. Fever, cardiac involvement and rash are the most common findings in this picture, which is called multisystem inflammatory syndrome (MIS-C). Although its pathophysiology is not fully known yet, the most common cause is thought to be post-infection immune dysregulation. Visceral leishmaniasis (VL) is a zoonosis in which Leishmania infantum and rarely Leishmania donovani are the agents and can cause a similar clinical picture. In this text; we discussed a patient who was followed up with a diagnosis of COVID-associated MIS-C, but without an adequate response in his clinic with MIS-C treatment, and was diagnosed with VL with further examinations. To our knowledge, this is the first MIS-C and VL co-occurence in the literature.

Serum vitamin B12 and D levels in children with Primary Raynaud Phenomenon: a retrospective cohort study.

Primary Raynaud phenomenon (RP) is resultant from transient vasospasm of peripheral arteries and arterioles, is usually precipitated by cold exposure or emotional stress, without any clue for autoimmune connective tissue diseases. We aimed to determine the frequency of vitamin D and B12 deficiencies in pediatric patients with primary RP, and to investigate their roles on the disease course. Vitamin B12 and D were supplemented if the patients had deficiencies. The study included 40 children with primary RP, 29 (72.5%) female and 11 (27.5%) male. The mean and median age were 15.1 ± 1.8 and 15.5 (range, 11.5-17.8) years. Symptoms were improved in 31 (77.5%) patients with warming procedures. Seventeen (41.5%) and 16 (39%) patients had low serum vitamin B12 and D levels, respectively. Vasodilator treatment requirement did not change by vitamin B12 status but was significantly lower in vitamin D deficient and replaced patients. Further studies are needed to clarify our results.

Evaluation of Clinical Findings and Treatment Results of Coronavirus Disease 2019 (COVID-19) in Pediatric Cancer Patients: A Single Center Experience.

Objective: The objective of the study is to evaluate the clinical findings and treatment results of COVID-19 in pediatric cancer patients. Study design: The study was designed as a single-center retrospective observational study. Pediatric cancer patients with COVID-19 admitted to the University of Health Sciences Adana City Training and Research Hospital pediatric COVID wards from October 2020 to October 2021 were included. Clinical data and demographic characteristics were retrieved from patient files. Results: A total of 45 pediatric cancer patients diagnosed with COVID-19 were included in the study. The mean age of the patients was 8.68 ± 5.16 years (range 1.5-17.5), 62.2% were men, 37.8% were Turkish citizens, and 62.2% were Syrian refugees. A total of 41 patients (91.1%) had leukemia/lymphoma, while 4 (8.9%) had solid tumors. The most common symptoms were fever (66.7%), respiratory (35.6%), and gastrointestinal symptoms (17.8%). Disease severity was evaluated as mild in 46.7%, moderate in 44.4%, and severe in 8.9% of patients. Patients presented with lymphopenia (88.9%), thrombocytopenia (73.3%), anemia (71.1%), and neutropenia (62.2%). Mean hospital length of stay was 15.18 ± 10.34 (range 6-62) days overall and 9.5 ± 2.39 (range 2 to 28) days in the PICU. Intensive care unit admission rate was 8.9%, and mortality rate was 4.4%. Median viral shedding period was 21 days (range 7-52). Conclusions: Our study reveals that the mortality rate, length of hospital stay, and the need for intensive care of pediatric cancer patients with COVID-19 are higher than those of healthy children. Prospective studies with larger sample sizes are needed to further evaluate the clinical findings and treatment results of COVID-19 in pediatric cancer patients.

Optical coherence tomography angiography in healthy children: normative data and age-related changes in microvascular structure of the optic disk and macula.

PURPOSE: To determine normative data and reference ranges according to age groups by measuring the foveal avascular zone (FAZ), superficial capillary plexus vascular density (SCP-VD), deep capillary plexus vascular density (DVP-VD), radial peripapillary capillary plexus vessel density (RPC-VD), and peripapillary retinal nerve fiber layer (ppRNFL) in healthy children and to determine the age and sex-related changes of these values. METHODS: This prospective study included data from 370 eyes of 370 healthy children (202 girls, 168 boys) aged 7-18 years. Participants were divided into four groups according to their age. Optical coherence tomography angiography (OCTA) measurements were taken using AngioVue (Avanti; Optivue). RESULTS: No statistically significant difference was observed in terms of FAZ, SCP-VD, DCP-VD, RPC-VD, and ppRNFL thickness values according to the age groups (except the RPC-VD superior) (p > 0.05 for all). VDs in all deep parafoveal regions in groups 1 and 2 were higher in girls. While FAZ values were higher in girls in all age groups (statistically significant in groups 1, 3, and 4), ad SPD and DPD values were higher in boys in all age groups (statistically significant in group 1 and 2 for SPD, and group 1 and 3 for DPD). CONCLUSIONS: We report normal reference ranges for macula and disk vessel density and ppRNFL parameters in healthy children aged 7-18 years using OCTA. These normative values could be useful in diagnosing retina and optic disk disease early in childhood.

Short-term Side Effects of Pulse Steroid Treatment in Children.

This study is aimed to evaluate pediatric patients, who were hospitalised in the Department of Pediatrics, University of Health Sciences, Adana City Training and Research Hospital, Turkey, between January, 2019 and January, 2020, and treated with pulse steroid therapy and the early side effects of their treatment. The fasting blood glucose levels of the patients during treatment were statistically significantly higher than those prior to the treatment. The most common side effects observed in the patients were dermatological (48.5%), psychiatric (31.4%), and gastrointestinal (31.4%). Hypertension was detected in seven patients (20%) after treatment; and continued in three, who subsequently underwent antihypertensive treatment. Pulse steroid treatment was administered for a median of five days (3-11 days). It was found that 24 patients responded to treatment, 11 patients did not respond, and one patient died. There is a shortage of studies in literature on pulse steroid therapy and its side effects, especially focusing on children. Multicentre and randomised controlled studies are needed comprising different patient groups to evaluate the efficacy and complications associated with its use. Key Words: Children, Side effect, Pulse steroid treatment.

Post-exposure Rabies Prophylaxis for Children in Southern Turkey.

OBJECTIVE: To evaluate the prophylaxis practices used on children with animal exposures in a major southern city of Turkey, close to the Syrian border. STUDY DESIGN: Cross-sectional study. PLACE AND DURATION OF STUDY: Emergency and Outpatient departments, Adana City Training and Research Hospital, Turkey between September 2017 and September 2018. METHODOLOGY: The demographic data of the patients, who presented due to animal contact; the interval between animal contact and hospital presentation; species of exposed animals, type, and apparent condition of the animals; risk categories based on national assessment scale; the number of rabies vaccines and anti-rabies immunoglobulin (RIG) administrations; administration of tetanus prophylaxis; adherence of patients to the follow-up schedule; vaccine refusals; and development of rabies disease (if any), were recorded. RESULTS: Of the 2,068 presentations after animal exposure, 906 (43.8%) were children, mostly boys (62%), and the mean age was 97.15 ± 57.68 months. Risky contact was most frequently caused by cats (52.8%) and dogs (45.6%). Exposure to stray animals was the most common (58.5%). For serial prophylaxis vaccinations, 761 (83.99%) families were in full compliance and 145 (16%) families had discontinued vaccinations. The discontinuation rate of the immigrant population was significantly higher (p = 0.001). CONCLUSION: Risky contacts were mostly due to stray animals. Efforts to minimise the stray animal population should be increased. The rate of discontinuation of rabies prophylaxis follow-ups was 16%. Significantly higher prophylaxis discontinuation among the immigrant population was noted. Key Words: Rabies, Vaccines, Prophylaxis, Turkey.

Vapor phase synthesis of ferroelectric microislands on PVDF thin films.

The interest in patterned polyvinylidene fluoride (PVDF) surfaces has grown significantly in the recent years due to ability to control the ferroelectric behavior through the size and shape of the surface structures. However, forming micron sized structures on the PVDF surface generally requires laborious lithography based methods or use of templates which complicates the process. In this study, we report spontaneous formation of microislands with ferroelectric response during PVDF growth via initiated chemical vapor deposition. Depositions performed under continuous and no flow conditions show that laminar precursor flow to the surface yield homogenous thin films, whereas no flow conditions of the batch mode result in the growth of surface protrusions (microislands) with higher polar phase content. Formation of these surface instabilities after an incubation time indicates the presence of local stress fields building with time, resulting in formation of the islands with higherßphase fraction to release the stress. Furthermore, the increased mobility of the polymer chains at high temperatures reduces the stress field, leading to lowerß/αphase ratios in smaller microislands.

Multisystem Inflammatory Syndrome in Children (MIS-C) Associated with COVID-19: A Case Series Experience in a Tertiary Care Hospital of Southern Turkey.

OBJECTIVE: Aim of the study is to assess the clinical characteristics and treatment outcomes of multisystem inflammatory syndrome in children (MIS-C) associated with COVID-19. STUDY DESIGN: The study comprised 52 children with MIS-C admitted to University of Health Sciences Adana City Training and Research Hospital pediatric wards from September 2020 to April 2021. Demographic characteristics and clinical data were retrospectively collected from patient files. RESULTS: Median age of patients was 9 (5-13) years. Fever (92.3%), abdominal pain (76.9%), rash (48.1%) and vomiting (48.1%) were the most common presenting symptoms. Fever duration was 8 (4.25-10) days in overall. Depressed left ventricular ejection fraction was found in 17.3% of patients. At admission, elevated levels of C-reactive protein, procalcitonine, erythrocyte sedimentation rate, D-dimer and ferritin were found in 98.1%, 96.2%, 75%, 84.6% and 69.2% of the patients, respectively. Lymphopenia, hyponatremia and hypoalbuminemia were found in 76.9%, 59.6% and 42.3% of the patients. Intravenous immunoglobulin was used in 96.2%, corticosteroids in 71.2% and anakinra in 3.8% of the patients. In total, 28.8% of the patients were admitted to pediatric intensive care unit and 17.3% received vasopressor support. Median duration of hospital length of stay was 12.5 days. Comorbidities were present in 19.2% of the patients. No mortality was recorded. CONCLUSIONS: While being rare and treatable, MIS-C is the ugly and mysterious face of the COVID-19 pandemic for children. The increasing number of MIS-C cases shows that this phenomenon is more common than thought. Comprehensive studies are required to understand the pathogenesis of the disease and determine the treatment regimens clearly. LAY SUMMARY: While being rare and treatable, multisystem inflammatory syndrome in children (MIS-C) associated with COVID-19 is the ugly and mysterious face of the COVID-19 pandemic for children. MIS-C is now thought to be a post-infectious (SARS-CoV2) hyperinflammatory disease secondary to an abnormal immune response, rather than a complete obscurity. The increasing number of MIS-C cases and new case series reports from all over the world show that MIS-C is more common than thought. Despite our increasing experience, we may encounter a new finding every day in MIS-C patients. Therefore, we want to contribute to literature by presenting the MIS-C cases we treated in our clinic in detail. We have experienced that MIS-C patients can apply with similar but also different and unique characteristics. In case of delayed diagnosis or treatment, morbidity and mortality rates may increase. Therefore, the level of awareness and knowledge of all physicians, especially those dealing with pediatric patients, about MIS-C should be increased. Although the early effects of MIS-C are known, we don't have enough information about the long-term consequences yet. Comprehensive studies are required to understand the pathogenesis of the disease and determine the treatment regimens clearly.

Pediatric anti-NMDA receptor encephalitis associated with COVID-19.

Anti-N-methyl-D-aspartate receptor encephalitis is a clinical condition characterized by acute behavioral and mood changes, abnormal movements, autonomic instability, seizures, and encephalopathy. We describe a 7-year-old boy diagnosed with autoimmune encephalitis due to NMDAR antibody in association with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease 2019) (COVID-19), without pulmonary involvement or fever. The patient presented with acute ataxia, rapidly developed encephalopathy, and autoimmune encephalitis was suspected. Steroid treatment was withheld because of lymphopenia and intravenous immunoglobulin was started. The absence of clinical response prompted plasmapheresis and, when lymphocyte counts improved, pulse steroid treatment was applied. The latter was followed by significant improvement and the patient was discharged in a conscious and ambulatory state. Autoimmune encephalitis should be considered in the presence of neurological symptoms accompanying SARS-CoV-2 infection and steroid treatment should be preferred unless limited by contraindications.

Evaluation of Pediatric Measles Cases Hospitalized in 2019.

OBJECTIVE: Outbreaks of measles were seen throughout the world in 2018-2019, including Turkey. Measles outbreak in Turkey may be attributed to cases imported from European countries and increased rate of unvaccinated children due to the massive influx of refugees from neighboring countries. MATERIALS AND METHODS: The demographic details and clinical and laboratory findings of the patients hospitalized with diagnosis of measles in the Pediatric Clinic of Adana City Hospital in 2019 were evaluated retrospectively. RESULTS: Among the 38 children enrolled, 18 were female (47.4%), the median age was 12 months (3-199 months), 20 were Turkish citizens (52.6%), and 18 (47.4%) were refugees. Twenty-seven children had vaccination data available, with 25 unvaccinated for measles. None of the families declared vaccine hesitancy. Of the unvaccinated subgroup (n = 25), 19 (76%) were younger than 12 months. The mean duration of hospitalization was 5.13 ± 2.67 days, no mortalities occurred. Measles was encountered in the social circle of 10 cases, although only 2 families applied for prophylaxis. CONCLUSIONS: Among the children with measles, 10 of the cases were reported to be within the household of previously diagnosed measles cases, but only 2 of them were given prophylaxis. Awareness regarding use of post-exposure prophylaxis against measles should be increased. Efforts to keep the measles vaccination coverage rate above optimal levels should be encouraged in regions with concentration of irregular refugees.

Multicenter Hospital-Based Prospective Surveillance Study of Bacterial Agents Causing Meningitis and Seroprevalence of Different Serogroups of Neisseria meningitidis, Haemophilus influenzae Type b, and Streptococcus pneumoniae during 2015 to 2018 in Turkey.

The etiology of bacterial meningitis in Turkey changed after the implementation of conjugated vaccines against Streptococcus pneumoniae and Haemophilus influenzae type b (Hib) in the Turkish National Immunization Program (NIP). Administration of Hib vaccine and PCV-7 (7-valent pneumococcal conjugate vaccine) was implemented in NIP in 2006 and 2009, respectively. In 2011, PCV-7 was replaced with PCV-13. Meningococcal vaccines have not yet been included in Turkish NIP. This prospective study comprised 27 hospitals located in seven regions of Turkey and represented 45% of the population. Children aged between 1 month and 18 years who were hospitalized with suspected meningitis were included. Cerebrospinal fluid (CSF) samples were collected, and bacterial identification was made according to the multiplex PCR assay results. During the study period, 994 children were hospitalized for suspected meningitis, and Hib (n = 3, 2.4%), S. pneumoniae (n = 33, 26.4%), and Neisseria meningitidis (n = 89, 71%) were detected in 125 samples. The most common meningococcal serogroup was MenB. Serogroup W comprised 13.9% (n = 5) and 7.5% (n = 4) of the meningococci in 2015 to 2016 and 2017 to 2018, respectively. Serogroup C was not detected. There were four deaths in the study; one was a pneumococcus case, and the others were serogroup B meningococcus cases. The epidemiology of meningococcal diseases has varied over time in Turkey. Differing from the previous surveillance periods, MenB was the most common serogroup in the 2015-to-2018 period. Meningococcal epidemiology is so dynamic that, for vaccination policies, close monitoring is crucial.IMPORTANCE Acute bacterial meningitis (ABM) is one of the most common life-threatening infections in children. The incidence and prevalence of ABM vary both geographically and temporally; therefore, surveillance systems are necessary to determine the accurate burden of ABM. The Turkish Meningitis Surveillance Group has been performing a hospital-based meningitis surveillance study since 2005 across several regions in Turkey. Meningococcus was the major ABM-causing agent during the 2015-to-2018 period, during which MenB was the dominant serogroup.

1 fm/Hz noise level low temperature Fabry-Pérot atomic force/magnetic force microscope operating in 4-300 K temperature range.

In this publication, we describe the design of a new fiber Fabry-Pérot interferometer and employ this to a low temperature atomic force/magnetic force microscope (LT-AFM/MFM) operating in the 4-300 K temperature range. A multilayer dielectric mirror coated optical fiber is used to achieve unprecedented 1 fm/Hz noise level, while the shot noise limit is 0.51 fm/Hz. The cavity length is adjustable, and the fiber can be brought within a very close proximity of the cantilever using a dedicated 2 mm stroke piezonanopositioner integrated on the piezotube scanner. The same nanopositioner also is used to park the fiber at a safe parking location during cantilever exchange. We demonstrate the performance of the LT-AFM/MFM by imaging the ITO thin film at 300 K, atomic steps on HOPG at 300 K, magnetic bits on the hard disk at 15 K, and the Abrikosov vortex lattice in the BSCCO(2122) single crystal at 4 K.

New Means to Control Molecular Assembly.

While self-assembly of molecules is relatively well-known and frequently utilized in chemical synthesis and material science, controlled assembly of molecules represents a new concept and approach. The present work demonstrates the concept of controlled molecular assembly using a non-spherical biomolecule, heparosan tetrasaccharide (MW = 1.099 kD). The key to controlled assembly is the fact that ultra-small solution droplets exhibit different evaporation dynamics from those of larger ones. Using an independently controlled microfluidic probe in an atomic force microscope, sub-femtoliter aqueous droplets containing designed molecules produce well-defined features with dimensions as small as tens of nanometers. The initial shape of the droplet and the concentration of solute within the droplet dictate the final assembly of molecules due to the ultrafast evaporation rate and dynamic spatial confinement of the droplets. The level of control demonstrated in this work brings us closer to programmable synthesis for chemistry and materials science which can be used to develop vehicles for drug delivery three-dimensional nanoprinting in additive manufacturing.